compositions for restoring lost circulation

5
8/10/2019 Compositions for Restoring Lost Circulation http://slidepdf.com/reader/full/compositions-for-restoring-lost-circulation 1/5  12) United States Patent Shaarpour US006861392B2 10) Patent N0.: 45) Date of Patent: US 6,861,392 B2 Mar. 1, 2005 (54) COMPOSITIONS FOR RESTORING LOST CIRCULATION 75) Inventor: Mano Shaarpour, Sugar Land, TX Us) 73) Assignee: Halliburton Energy Services, Inc., Duncan, OK US) * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154 b) by 247 days. 21) Appl. No.: 10/107,873 22) Filed: Mar. 26, 2002 (65) Prior Publication Data US 2003/0186819 A1 Oct. 2, 2003 (51) Int. c1.7 ........................... C09K /02; c091< 7/00 (52) US. Cl. ....................... .. 507/104;175/72;507/112; 507/126; 507/128; 507/140; 507/204; 507/214; 507/232; 507/235; 507/269 (58) Field of Search .......................... .. 175/72; 507/104, 507/112, 126, 128, 140, 204, 214, 232, 235, 269 56) References Cited U.S. PATENT DOCUMENTS 2,944,018 A 7/1960 Borcherdt 4,217,965 A * 8/1980 Cremeans .... .. 175/72 4289632 9/1981 Clear . . . . . . . . . . . . . .. 507/104 4,428,844 1/1984 Wagener . . . . . . . . .. 507/104 4,531,594 A 7/1985 CoWan ............... . 175/272 4,836,940 A 6/1989 Alexander .... .. 252/8512 5,458,195 A 10/1995 Totten et al. 166/293 5,501,277 3/1996 Onan t al. . . . . . . . . .. 166/293 5,569,324 A 10/1996 Totten et al. 106/696 5,826,669 10/1998 Zaleski et al. . . . . . . . . . . . .. 175/72 6,630,429 B1 * 10/2003 Cremeans et al. .. 507/104 2003/0158046 A1 8/2003 Patel et al. . . . . . . . . . . . . .. 507/200 2003/0162669 A1 * 8/2003 Benton et al. ............ .. 507/100 OTHER PUBLICATIONS Paper entitled “Multi—Functional Solid Lubricant Reduces Friction/Prevents Mud Loss” by Jerry Alleman, dated Sep. 1998. Baroid brochure entitled BARO—TROL® lus Shale Stabi liZer dated Feb. 2000. Baroid brochure entitled DEXTRID® LT Filtration Control Agent dated May 1999. Baroid brochure entitled DRILTREAT® Oil Wetting Agent dated May 1999. Baroid brochure entitled DURATONE® HT iltration Con trol Agent dated May 1999. Baroid brochure entitled HY—SEAL® Lost Circulation Material dated May 1999. Baroid brochure entitled LETM SUPERMUL Emulsi?er dated May 1999. Baroid brochure entitled STEELSEALTM Lost Circulation Additive dated May 1999. Baroid brochure entitled Steelseal FineTM Lost Circulation Material dated Nov. 2000. Baroid brochure entitled SUSPENTONETM Suspension Agent dated May 1999. Baroid brochure entitled AQUAGEL® iscosi?er date May 1999. Baroid brochure entitled Aquagel Gold Seal® Viscosi?er dated May 1999. Baroid brochure entitled BARACARB® Bridging Agent dated May 1999. Baroid brochure entitled BAROFIBRE® Seepage Loss Additive dated May 1999. Baroid brochure entitled BAROFIBRE® Super?ne Seepage Loss Additive dated May 1999. * cited by examiner Primary Examiner—Phili p C. Tucker 74) Attorney, Agent, or Firm—Craig W. Roddy; Haynes and Boone, LLP 57) ABSTRACT A ethod and composition is provided for sealing a subter ranean Zone penetrated by a Well bore to restore lost circu lation. In one embodiment, the composition comprises a pellet comprising a mixture of lost circulation materials LCMs). 38 Claims, N0 Drawings

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Page 1: Compositions for Restoring Lost Circulation

8/10/2019 Compositions for Restoring Lost Circulation

http://slidepdf.com/reader/full/compositions-for-restoring-lost-circulation 1/5

  1 2 ) United S t a t e s

Patent

S h a a r p o u r

US006861392B2

1 0 ) P a t e n t

N 0 . :

4 5 ) Date

o f P a t e n t :

US

6 , 8 6 1 , 3 9 2 B2

M a r . 1 ,

2 0 0 5

( 5 4 ) COMPOSITIONS

FOR RESTORING LOST

CIRCULATION

7 5 ) I n v e n t o r :

Mano

S h a a r p o u r ,

S u g a r L a n d ,

TX

U s )

7 3 ) A s s i g n e e :

H a l l i b u r t o n

E n e r g y S e r v i c e s , I n c . ,

D u n c a n ,

OK U S )

*

) N o t i c e : S u b j e c t

t o a n y d i s c l a i m e r , t h e t e r m o f

t h i s

p a t e n t i s e x t e n d e d

o r a d j u s t e d

u n d e r 3 5

U . S . C . 1 5 4 b )

b y

2 4 7 d a y s .

2 1 )

A p p l . N o . : 1 0 / 1 0 7 , 8 7 3

2 2 ) F i l e d :

M a r .

2 6 , 2 0 0 2

( 6 5 ) P r i o r P u b l i c a t i o n D a t a

U S 2003/0186819 A1 O c t . 2 , 2003

( 5 1 ) I n t . c 1 . 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . C09K

/ 0 2 ;

c091< 7/00

(52)

US.

Cl. . . . . . . . . . . . . . . . . . . . . . . . . .

5 0 7 / 1 04;1 7 5 / 7 2;5 0 7 / 1 1 2;

5 0 7 / 1 2 6 ; 5 0 7 / 1 2 8 ; 5 0 7 / 1 4 0 ; 5 0 7 / 2 0 4 ; 5 0 7 / 2 1 4 ;

5 0 7 / 2 3 2 ; 5 0 7 / 2 3 5 ; 5 0 7 / 2 6 9

( 5 8 )

Field of

Search

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 175/72; 507/104,

5 0 7 / 1 1 2 ,

1 2 6 , 1 2 8 , 1 4 0 , 2 0 4 , 2 1 4 , 2 3 2 ,

2 3 5 ,

2 6 9

5 6 ) R e f e r e n c e s

C i t e d

U . S . PATENT DOCUMENTS

2 , 9 4 4 , 0 1 8

A 7 / 1 9 6 0

B o r c h e r d t

4,21 7, 96 5 A *

8 / 1 9 8 0 Cremeans

. . . . . . 1 7 5 / 7 2

4 289 632

9/1981

Clear

. . . . . . . . . . . . .

.. 507/104

4,428,844

1/1984

Wagener

. . . . . . . .

..

507/104

4,531,594 A

7/1985

CoWan

...............

.

175/272

4,836,940 A

6/1989

Al exander

. . . .

. . 252/8512

5 , 4 5 8 , 1 9 5

A 1 0 / 1 9 9 5 T o t t e n e t

a l .

1 6 6 / 2 9 3

5,501,277 3/1996

Onan

t

al .

. . . . . . . .

..

166/293

5 , 5 6 9 , 3 2 4 A 1 0 / 1 9 9 6 T o t t e n e t

a l .

1 0 6 / 6 9 6

5,826,669

10/1998

Zaleski

et a l .

. . . . . . . . . . . .. 175/72

6,630,429 B1 * 10/2003

Cremeans e t a l .

. .

507/104

2003/0158046A1

8/2003 Patel

et

al.

. . . . . . . . . . . . .. 507/200

2003/0162669 A1

*

8 / 2 0 0 3 Benton e t a l . . . . . . . . . . . . . . . 5 0 7 / 1 0 0

OTHER PUBLICATIONS

P a p e r

e n t i t l e d “ M u l t i — F u n c t i o n a l S o l i d L u b r i c a n t

R e d u c e s

F r i c t i o n / P r e v e n t s Mud L o s s ”

b y

J e r r y A l l e m a n , d a t e d S e p .

1 9 9 8 .

B a r o i d b r o c h u r e

e n t i t l e d BARO—TROL® l u s

S h a l e S t a b i

l i Z e r

d a t e d F e b .

2 0 0 0 .

B a r o i d

b r o c h u r e e n t i t l e d DEXTRID® LT F i l t r a t i o n C o n t r o l

A g e n t d a t e d

May

1 9 9 9 .

B a r o i d

b r o c h u r e e n t i t l e d DRILTREAT® O i l

W e t t i n g

A g e n t

d a t e d May 1 9 9 9 .

B a r o i d b r o c h u r e

e n t i t l e d

DURATONE®

HT

i l t r a t i o n Con

t r o l A g e n t d a t e d May 1 9 9 9 .

B a r o i d b r o c h u r e

e n t i t l e d

HY—SEAL® L o s t

C i r c u l a t i o n

M a t er i a l d a t e d May 1 9 9 9 .

B a r o i d b r o c h u r e

e n t i t l e d

LETM SUPERMUL Emulsi?er

d a t e d

May

1 9 9 9 .

B a r o i d b r o c h u r e

e n t i t l e d

STEELSEALTM L o s t C i r c u l a t i o n

A d d i t i v e d a t ed May 1 9 9 9 .

B a r o i d b r o c h u r e e n t i t l e d

S t e e l s e a l

F i n e T M L o s t C i r c u l a t i o n

M a t e r i a l

d a t e d

Nov.

2 0 0 0 .

B a r o i d b r o c h u r e

e n t i t l e d

SUSPENTONETM

S u s p e n s i o n

A g e n t d a t e d

May

1 9 9 9 .

B a r o i d b r o c h u r e

e n t i t l e d

AQUAGEL®

i s c o s i ? e r d a t e May

1 9 9 9 .

B a r o i d

b r o c h u r e e n t i t l e d A q u a g e l G o l d Seal® V i s c o s i ? e r

d a t e d

May

1 9 9 9 .

B a r o i d b r o c h u r e

e n t i t l e d BARACARB®

B r i d g i n g

A g e n t

d a t e d

May

1 9 9 9 .

B a r o i d b r o c h u r e

e n t i t l e d

BAROFIBRE® S e e p a g e L o s s

A d d i t i v e d a t ed May

1 9 9 9 .

B a r o i d b r o c h u r e e n t i t l e d BAROFIBRE®

S u p e r ? n e S ee p a g e

L o s s A d d i t i v e d a te d May

1 9 9 9 .

* c i t e d

by

examiner

P r i m a r y E x a m i n e r — P h i l i p C . T u c k e r

7 4 )

A t t o r n e y , A g e n t , o r

F i r m — C r a i g

W .

R o d d y ; H a y n e s

a n d B o o n e , LLP

5 7 ) ABSTRACT

A

ethod a n d c o m p o s i t i o n i s p r o v i d e d f o r s e a l i n g a s u b t e r

ranean Zone p e n e t r a t e d

by a

W e l l bore t o

r e s t o r e

l o s t c i r c u

l a t i o n .

I n

o n e embodiment, t h e c o m p o s i t i o n c o m p r i s e s a

p e l l e t

c o m p r i s i n g a m i x t u r e o f l o s t

c i r c u l a t i o n

m a t e r i a l s

L C M s ) .

3 8 C l a i m s ,

N0 D r a w i n g s

Page 2: Compositions for Restoring Lost Circulation

8/10/2019 Compositions for Restoring Lost Circulation

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US 6 , 8 6 1 , 3 9 2 B2

1

COMPOSITIONS FOR RESTORING LOST

CIRCULATION

BACKGROUND

T h e p r e s e n t e m b o d i m e n t r e l a t e s g e n e r a l l y t o

c o m p o s i

t i o n s a n d m e t h o d s o f u t i l i z i n g t h e c o m p o s i t i o n s f o r s e a l i n g

a

s u b t e r r a n e a n

Zone

p e n e t r a t e d

by

a

W e l l bore

t o r e s t o r e l o s t

c i r c u l a t i o n .

W h i l e

d r i l l i n g

o i l

a n d g a s

W e l l s ,

a d r i l l i n g ? u i d

i s c i r c u

l a t e d

t h r o u g h a

d r i l l b i t

i n a W e l l b o r e

and

t h e n back

t o t h e

e a r t h

s u r f a c e ,

t h e r e b y

r e m o v i n g

c u t t i n g s

f r o m t h e

W e l l b o r e .

The d r i l l i n g ? u i d i s t h e n o f t e n r e c o n d i t i o n e d a n d r e u s e d . I n

t h e

W e l l b o r e ,

t h e d r i l l i n g

? u i d m a i n t a i n s a

p r e d e t e r m i n e d

h y d r o s t a t i c p r e s su r e . H o W e v e r , When

t h e

d r i l l b i t e n c o u n t e r s

c e r t a i n

u n f a v o r a b l e

s u b t e r r a n e a n Z o n e s , t h e h y d r o s t a t i c p r e s

s u r e i s c o m p r o m i s e d , r e s u l t i n g i n

W h a t

i s commonly knoWn

a s “ l o s t c i r c u l a t i o n . ”

For example,

l o s t c i r c u l a t i o n

o c c u r s

When

t h e

d r i l l

b i t

e n c o u n te r s c o m p a r a t i v e l y loW

p r e s s u r e

s u b t e r r a n e a n Z o n es , s u c h a s v u g s , f r a c t u r e s , and o t h e r t h i e f

Z o n e s . S i m i l a r l y , e n co u n t er i n g c o m p a r a t i v e l y h i g h

p r e s s u r e

s u b t e r r a n e a n Zones

r e s u l t s i n

cross?oWs o r underground

b l o W - o u t s ,

a n d s u b s e q u e n t l y

l o s t

c i r c u l a t i o n .

L o s t

c i r c u l a t i o n

r e q u i r e s r e m e d i a l s t e p s . Most r e m e d i a l

s t e p s c o m p r i s e i n t r o d u c i n g l o s t

c i r c u l a t i o n m a t e r i a l s

(“LCMs”)

i n t o t h e

W e l l b o r e

t o s e a l t h e

a b o v e - d e s c r i b e d

loW

p r e s s u r e

s u b t e r r a n e a n Zones o r

high p r e s s u r e

s u b t e r r a n e a n

Z o n e s .

LCMs n c l u d e

l o W - c o s t

W a s t e

p r o d u c t s

from t h e f o o d

p r o c e s s i n g o r c h e m i c a l m a n u f a c t u r i n g i n d u s t r i e s , s u c h a s

g r o u n d

p e a n u t s h e l l s ,

m i c a , c e l l o p h a n e , W a l n u t s h e l l s , c a l

c i u m

c a r b o n a t e ,

p l a n t ? b e r s ,

c o t t o n s e e d h u l l s ,

g r o u n d

r u b b e r , a n d p o l y m e r i c m a t e r i a l s . LCMs c a n b e

c l a s s i ? e d

a c c o r d i n g t o t h e i r

p r o p e r t i e s ,

f o r e X a m p l e ,

t h e r e

r e

f o r m a

t i o n b r i d g i n g LCMs

n d s e e p a g e

l o s s

LCMs.

O f t e n , more

t h a n

o n e LCM

y p e must b e p l a c e d doWn h o l e ,

b a s e d

on t h e

r e q u i r e d

LCM r o p e r t i e s .

DESCRIPTION

A

o m p o s i t i o n

a c c o r d i n g

t o t h e

p r e s e n t

i n v e n t i o n

f o r

s e a l i n g a s u b t e r r a n e a n Zone p e n e t r a t e d by a

W e l l

b o r e t o

r e s t o r e

l o s t

c i r c u l a t i o n c o m p r i s e s

a n LCM e l l e t

c o m p r i s i n g

a f o r m a t i o n

b r i d g i n g

component, a s e e p a g e l o s s component,

a n d a n

o i l

W e t t i n g c o m p o n e n t .

T h e s e

t e r m s , a n d

t h e i d e n t i t y

o f

compounds W i t h i n e a c h component t y p e , a r e

W e l l

knoWn

t o t h o s e s k i l l e d i n

t h e

a r t .

T h e p e l l e t may b e p r o d u c e d

b y

a n y c o n v e n t i o n a l m e a n s ,

s u c h a s c o m p r e s s i o n , a n d may

b e

o f a n y c o n v e n i e n t s i Z e ,

s u c h a s 1 A 1 “

d i a m e t e r .

I t i s u n d e r s t o o d t h a t

a

s i n g l e p e l l e t

Would

n o t b e e f f i c a c i o u s , a n d s o t h e p e l l e t s a r e

p r e f e r a b l y

u s e d

i n

b u l k ,

f o r

e X a m p l e , i n 4 0 p o u n d s a c k s .

I n

o n e

e m b o d i m e n t , t h e p e l l e t i Z e d c o m p o s i t i o n c o m p r i s e s

a n a n g u l a r c a r b o n

compound

a v a i l a b l e from B a r o i d , a

H a l l i b u r t o n C o m p a n y , o f

H o u s t o n , T e X . , u n d e r t h e t r a d e

mark

“STEELSEALTM”

f o r

b r i d g i n g f o r m a t i o n s

h a v i n g

p r o p e r t i e s

o f

t o r q u e r e d u c t i o n f o r

u s e

i n o i l a n d

g a s

d r i l l i n g

? u i d s ,

a ?brous

c e l l u l o s e m a t e r i a l a v a i l a b l e

from

B a r o i d ,

a

H a l l i b u r t o n C o m p a n y , o f

H o u s t o n ,

T e X . ,

u n d e r t h e

t r a d e

mark

“BAROFIBRETM” f o r p r e v e n t i n g s e e p a g e ,

s h r e d d e d

c e l l u l o s e m a t e r i a l

a v a i l a b l e from

B a r o i d , a

H a l l i b u r t o n

C o m p a n y ,

o f

H o u s t o n , T e X . ,

u n d e r t h e t r a d e m a r k “HY

SEALTM” f o r

p r e v e n t i n g

s e e p a g e a n d r e d u c i n g l o s s e s i n

W a t e r

b a s e

d r i l l i n g ? u i d s , a n d a

l e c i t h i n

l i q u i d

d i s p e r s i o n

a v a i l a b l e f r o m B a r o i d , a H a l l i b u r t o n

Company,

o f H o u s t o n ,

T e X . , under t h e trademark

“DRILTREATTM”

a s

an

o i l

Wet

t i n g a g e n t .

P r e f e r a b l y , t h i s

e m b o d i m e n t

o f

t h e

p e l l e t i Z e d

c o m p o s i t i o n

c o m p r i s e s a p e l l e t c o m p r i s i n g 40

STEELSEAL a n g u l a r

10

1 5

20

25

30

35

40

45

50

55

60

6 5

2

c a r b o n

compound, 30 BAROFIBRE ? b r o u s

c e l l u l o s e

m a t e r i a l , 20

HY-SEAL

s h r e d d e d c e l l u l o s e m a t e r i a l , a n d

10

DRILTREAT l e c i t h i n

l i q u i d d i s p e r s i o n ,

h e r e a f t e r

r e f e r r e d t o

a s

t h e “Coarse LCM e l l e t

T y p e . ”

The Coarse

LCM e l l e t

Type Would n o r m a l l y be used

t o

c u r e s e v e r e

l o s s e s o f a l l t y p e s o f d r i l l i n g ? u i d s .

TWo

m i X i n g

p r o c e d u r e s

a r e

c o n t e m p l a t e d

f o r

u s e ,

a n d

b o t h p r o c e d u r e s r e q u i r e 3 0 — 4 5 m i n u t e s o f s o a k i n g t i m e . I n

a ? r s t p r o c e d u r e , 25

b a r r e l s

o f

e X i s t i n g

mud

r e added t o a

s l u g g i n g p i t , a n d t h e n m i X e d W i t h 1 8 0 0 p o u n d s ( 4 5 f o r t y

p o u n d s a c k s ) o f C o a r s e LCM e l l e t T y p e ,

a n d

p l a c e d doWn

h o l e i n a conventional manner.

I n

a

second

p r o c e d u r e ,

25

b a r r e l s o f f r e s h

W a t e r

a r e

miXed W i t h 250

p o u n d s ( 5 ? f t y

p o u n d s a c k s ) o f s o d i u m m o n t m o r i l l o n i t e

b e n t o n i t e ) ,

a v a i l

a b l e f r o m B a r o i d , a

H a l l i b u r t o n Company,

o f H o u s t o n , T e X . ,

under

t h e

trademark

“AQUAGELTM”

o r use

a s

a v i s c o s i ? e r ,

t h e n

m i X e d W i t h 1 8 0 0

p o u n d s ( 4 5 f o r t y

p o u n d s a c k s )

o f

C o a r s e LCM P e l l e t T y p e , a n d p l a c e d

doWn h o l e

i n a

conventional

manner.

I n

a s e c o n d embodiment, t h e p e l l e t i Z e d c o m p o s i t i o n com

p r i s e s a n a n g u l a r c a r b o n compound a v a i l a b l e f r o m B a r o i d ,

a H a l l i b u r t o n Company,

o f

H o u s t o n , T e X . , u n d e r t h e t r a d e

mark

“STEELSEAL

FINETM” f o r b r i d g i n g

f o r m a t i o n s ,

a

? b r o u s c e l l u l o s e

m a t e r i a l

a v a i l a b l e from

B a r o i d , a

H a l l i b u r

t o n

Company, o f

H o u s t o n ,

T e X . ,

u n d e r t h e t r a d e m a r k

“BAROFIBRE

SUPERFINETM” f o r

p r e v e n t i n g s e e p a g e ,

g r a p h i t e , c a l c i u m c a r b o n a t e a v a i l a b l e from B a r o i d ,

a

H a l l i

b u r t o n

Company, o f

H o u s t o n , T e X . , u n d e r t h e t r a d e m a r k

“BARACARB 5

M ” , m o d i ? e d h y d r o c a r b o n p o W d e r a v a i l

a b l e f r o m B a r o i d , a

H a l l i b u r t o n Company,

o f H o u s t o n , T e X . ,

u n d e r t h e t r a d e m a r k “BARO-TROLTM”, a n d

DRILTREAT

l e c i t h i n

l i q u i d

d i s p e r s i o n a s a n o i l W e t t i n g

a g e n t .

P r e f e r a b l y ,

t h i s

e m b o d i m e n t o f h e p e l l e t i Z e d c o m p o s i t i o n

c o m p r i s e s a

p e l l e t

c o m p r i s i n g 25 STEELSEAL

FINE

a n g u l a r c a r b o n c o m p o u n d , 2 9 . 5 % BAROFIBRE SUPER

FINE ? b r o u s c e l l u l o s e m a t e r i a l , 5 g r a p h i t e , 10 BARA

CARB 5 c a l c i u m c a r b o n a t e , 15 BARO-TROL modi?ed

h y d r o c a r b o n , a n d

1 5 . 5 %

DRILTREAT

l e c i t h i n

l i q u i d

d i s p e r s i o n , h e r e a f t e r r e f e r r e d t o a s t h e

“ F i n e

LCM e l l e t

T y p e . ” T h e

F i n e LCM

e l l e t T y p e W o u l d

n o r m a l l y b e u s e d

t o

c u r e l o s s e s

i n

d e p l e t e d

Z o n e s ,

m i c r o - f r a c t u r e d

f o r m a t i o n s ,

a n d p o r e t h r o a t

o p e n i n g s ,

a n d i s c o m p a t i b l e W i t h a l l

t y p e s o f

d r i l l i n g ? u i d s .

TWo m i X i n g

p r o c e d u r e s a r e

c o n t e m p l a t e d

f o r

u s e , a n d

b o t h p r o c e d u r e s r e q u i r e

3 0 — 4 5

m i n u t e s o f s o a k i n g

t i m e . I n

a

? r s t

p r o c e d u r e , 25

b a r r e l s

o f

e X i s t i n g

mud r e

added

t o a

s l u g g i n g p i t , a n d t h e n m i X e d W i t h 2 0 0 0 p o u n d s ( 5 0

f o r t y

p o u n d

s a c k s )

o f

F i n e LCM e l l e t T y p e ,

a n d

p l a c e d doWn

h o l e i n

a conventional

manner.

I n a

second p r o c e d u r e , 25

b a r r e l s

o f

f r e s h

W a t e r a r e miXed W i t h 250

p o u n d s ( 5

? f t y

p o u n d

s a c k s )

o f AQUAGEL

s o d i u m

m o n t m o r i l l o n i t e

( b e n t o n i t e ) f o r u s e a s a v i s c o s i ? e r , t h e n miXed

W i t h

2000

p o u n d s

( 5 0

f o r t y

p o u n d

s a c k s )

o f F i n e

LCM

e l l e t

T y p e ,

a n d

p l a c e d doW n h o l e i n

a

c o n v e n t i o n a l

manner.

The

f o l l o W i n g

e X a m p l e s a r e i l l u s t r a t i v e

o f

t h e

methods

a n d c o m p o s i t i o n s d i s c u s s ed a b o v e .

EXAMPLE

A e l l Was d r i l l e d , and

a

2 0 “ d r i v e p i p e

Was

s e t a t 301

f e e t . W h i l e

d r i l l i n g

a h e a v y s a n d s e c t i o n ,

t h e W e l l d e v e l o p e d

s e e p a g e

a n d

p a r t i a l l o s s e s . At

a

d e p t h o f

1730

f e e t , t h e W e l l

l o s t c o m p l e t e r e t u r n s .

D r i l l i n g

Was s t o p p e d a n d

t h e

s t a n d s

Were p u l l e d , ? l l i n g t h e b a c k s i d e o f t h e W e l l W i t h s e a W a t e r .

3 2 p p b C o a r s e

LCM

e l l e t T y p e

a n d 1 0

p p b

BAROFI

BRE ?brous

c e l l u l o s e

m a t e r i a l Were miXed With s u f ? c i e n t

? u i d

t o form a 50 b a r r e l

p i l l .

The

C o a r s e

LCM e l l e t Type

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US 6 , 8 6 1 , 3 9 2 B2

TABLE - c o n t i n u e d

C o m p o n e n t s

Amount

B a r i t e , l b

2 2 8 . 7

C a l c i u m

c h l o r i d e ,

l b

2 1 . 9

S t i r r e d , min 1 5

R o l l e d

@

5 0 °

F . ,

h r 1 6

The

d r i l l i n g ?uid l i s t e d i n TABLE 2

Was

used a s

a

s t a n d a r d

and F i n e LCM P e l l e t

Type

Was mixed W i t h t h e

d r i l l i n g

?uid

t o

c r e a t e a b a t c h V a r i o u s p r o p e r t i e s Were

c o m p a r e d f o r

t h e

s t a n d a r d a n d B a t c h A , a n d

t h e

p r o p e r t i e s

a r e

l i s t e d i n TABLE

.

TABLE

P r o p e r t i e s S t a n d a r d A

Fine LCM

e l l e t Type, l b / b b l

15

D i s p e r s i o n

t i m e ,

min

— 15

Temperature,

° F .

120 120

P l a s t i c v i s c o s i t y , c P 2 0 2 3

Y i e l d

p o i n t ,

l b / 1 0 0 f t 2 2 0

2 4

1 0 S e c

g e l ,

l b / 1 0 0

f t 2

1 0

1 2

1 0

Min g e l ,

l b / l O O n 2 1 3

1 4

Spurt

on 90

[um

at 200°

F . ,

ml — —

T o t a l F i l t r a t e 2 . 0 2 . 0

S p u r t

on

190 , u m

a t

2 0 0 ° F . ,

ml

3 0 4 . 0

Total

Filtrate —

9.2

Fann 3 5 d i a l

r e a d i n g s

6 0 0 rpm 6 0 7 0

Fann 3 5

d i a l r e a d i n g s

300 rpm 4 0 47

Fann 3 5 d i a l

r e a d i n g s

200 rpm 3 3 3 8

Fann 3 5

d i a l r e a d i n g s

1 0 0 rpm 2 4 2 8

Fann 3 5

d i a l r e a d i n g s

6 rpm

1 1

1 3

Fann 3 5

d i a l

r e a d i n g s 3 rpm 1 0 1 2

T h e F i n e

LCM e l l e t

T y p e s u c c e s s f u l l y

d i s p e r s e d W i t h i n

15 minutes o f s t i r r i n g

on a

m u l t i - m i x e r and

Was t e s t e d f o r

? l t r a t i o n c o n t r o l

a t 200° . on both

a

90

pm

nd 190 pm

i s k .

There Was l i t t l e

d i f f e r e n c e between

t h e Batch

A

nd t h e

s t a n d a r d

? l t r a t e s

u s i n g

t h e

90

pm

i s k ,

t h e r e f o r e

a

190

pm

d i s k Was u s e d . Batch Aresulted

i n a 9 . 2

ml t o t a l

? l t r a t e

l o s s .

A l t h o u g h

o n l y

a

f e W

e x e m p l a r y e m b o d i m e n t s o f t h i s

i n v e n t i o n h a v e b e e n d e s c r i b e d

i n

d e t a i l a b o v e , t h o s e s k i l l e d

i n

t h e a r t W i l l r e a d i l y a p p r e c i a t e

t h a t

many o t h e r

modi?ca

t i o n s a r e p o s s i b l e

i n

t h e e x e m p l a r y embodiments W i t h o u t

m a t e r i a l l y

d e p a r t i n g f r o m

t h e

n o v e l t e a c h i n g s

a n d a d v a n

t a g e s o f

t h i s

i n v e n t i o n . A c c o r d i n g l y , a l l s u c h m o d i ? c a t i o n s

a r e

i n t e n d e d t o be i n c l u d e d W i t h i n

t h e

scope o f

t h i s

i n v e n t i o n ,

a s

de?ned i n

t h e f o l l o W i n g

c l a i m s .

What

i s c l a i m e d

i s :

1 .

A ethod

o f

s e a l i n g a s u b t e r r a n e a n

Z o n e

p e n e t r a t e d by

a W e l l b o r e

t o r e s t o r e l o s t c i r c u l a t i o n

c o m p r i s i n g :

p e l l e t i Z i n g

a

c o m p o s i t i o n c o m p r i s i n g

a f o r m a t i o n

b r i d g

i n g component,

a

s e e p a g e

l o s s

component, a n o i l

W e t t i n g c o m p o n e n t , a n d m o d i ? e d h y d r o c a r b o n t o f o r m

a

p e l l e t ;

c o n t a c t i n g t h e

p e l l e t W i t h a

? u i d t o form

a

p i l l ;

a n d

p l a c i n g

t h e

p i l l

i n t o t h e

s u b t e r r a n e a n Z o n e , t h e r e b y

s e a l i n g

t h e

s u b t e r r a n e a n

Z o n e a n d

r e s t o r i n g l o s t c i r c u l a t i o n .

2 . The method o f c l a i m 1 W h e r e i n t h e

s e e p a g e

l o s s

component

i s a ?brous c e l l u l o s e

m a t e r i a l .

3 . The method

o f

c l a i m 1 W h e r e i n t h e s e e p a g e l o s s

component

i s a s h r e d d e d

c e l l u l o s e m a t e r i a l .

4 . The

method

o f

c l a i m 1 W h e r e i n t h e

c o m p o s i t i o n

c o m p r i s e s 40 o f a n

a n g u l a r

c a r b o n compound, 30

o f

a

? b r o u s c e l l u l o s e m a t e r i a l ,

20 o f a

s h r e d d e d c e l l u l o s e

m a t e r i a l , a n d 10

o f

a

l e c i t h i n

l i q u i d d i s p e r s i o n .

5 . The method o f c l a i m

1 W h e r e i n

t h e c o m p o s i t i o n

c o m p r i s e s

25

o f

a n a n g u l a r c a r b o n compound, 29.5

o f

a

10

1 5

20

25

30

35

40

45

50

55

60

6 5

6

? b r o u s

c e l l u l o s e

m a t e r i a l , 5

g r a p h i t e ,

10 c a l c i u m

c a r b o n a t e , 15 modi?ed h y d r o c a r b o n , a n d 15.5 o f a

l e c i t h i n

l i q u i d

d i s p e r s i o n .

6 . The method o f

c l a i m 1 W h e r e i n

t h e ? u i d i s e x i s t i n g

d r i l l i n g m u d .

7 .

The method

o f

c l a i m

1 Wherein t h e ? u i d i s a

m i x t u r e o f

W a t e r

and sodium

m o n t m o r i l l o n i t e .

8 . A e l l e t

f o r s e a l i n g a

s u b t e r r a n e a n

Z o n e p e n e t r a t e d b y

a W e l l

b o r e

t o r e s t o r e l o s t c i r c u l a t i o n c o m p r i s i n g :

a f o r m a t i o n b r i d g i n g c o m p o n e n t ,

a

seepage

l o s s component,

a n

o i l

W e t t i n g

c o m p o n e n t ,

a n d

m o d i ? e d

h y d r o c a r b o n .

9 . The

p e l l e t o f

c l a i m

8 W h e r e i n

t h e s e e p a g e l o s s

com

ponent

i s

a ?brous c e l l u l o s e

m a t e r i a l .

1 0 .

The p e l l e t

o f c l a i m

8

W h e r e i n t h e s e e p a g e l o s s

component

i s a s h r e d d e d

c e l l u l o s e m a t e r i a l .

1 1 . The

p e l l e t

o f c l a i m 8 f u r t h e r c o m p r i s i n g 40 o f a n

a n g u l a r c a r b o n compound,

30 o f a ? b r o u s c e l l u l o s e

m a t e r i a l , 20

o f

a

s h r e d d e d

c e l l u l o s e m a t e r i a l ,

a n d 10 o f

a l e c i t h i n l i q u i d d i s p e r s i o n .

1 2 .

The

p e l l e t

o f

c l a i m

8

f u r t h e r

c o m p r i s i n g

25

o f a n

a n g u l a r

c a r b o n compound,

29.5

o f a ? b r o u s

c e l l u l o s e

m a t e r i a l ,

5

g r a p h i t e , 10

c a l c i u m c a r b o n a t e ,

15

m o d i

? e d

h y d r o c a r b o n ,

a n d 1 5 . 5 % o f

a

l e c i t h i n

l i q u i d

d i s p e r s i o n .

1 3 . Amethod o f

s e a l i n g

a s u b t e r r a n e a n

Z o n e

p e n e t r a t e d by

a W e l l

b o r e

t o

r e s t o r e

l o s t

c i r c u l a t i o n

c o m p r i s i n g :

p e l l e t i Z i n g a c o m p o s i t i o n c o m p r i s i n g a f o r m a t i o n b r i d g

i n g

component

c o m p r i s i n g a n a n g u l a r

c a r b o n

compound, a s e e p a g e l o s s

component, and

a n o i l

Wet

t i n g c o m p o n e n t

t o

f o r m a p e l l e t ;

c o n t a c t i n g t h e

p e l l e t W i t h a

? u i d t o form

a p i l l ; a n d

p l a c i n g

t h e p i l l i n t o

t h e

s u b t e r r a n e a n

Z o n e ,

t h e r e b y

s e a l i n g

t h e s u b t e r r a n e a n Z o n e a n d

r e s t o r i n g l o s t

c i r c u l a t i o n .

1 4 .

The method o f c l a i m 1 3 W h e r e i n t h e

s e e p a g e

l o s s

component

i s a ?brous c e l l u l o s e m a t e r i a l .

1 5 . The method

o f

c l a i m 1 3 W h e r e i n t h e

s e e p a g e

l o s s

component

i s a s h r e d d e d

c e l l u l o s e m a t e r i a l .

1 6 . The

method o f

c l a i m 1 3 W h e r e i n t h e

o i l W e t t i n g

c o m p o n e n t

i s

a

l e c i t h i n

l i q u i d d i s p e r s i o n .

1 7 . The method

o f

c l a i m 1 3 W h e r e i n t h e c o m p o s i t i o n

c o m p r i s e s

40

o f a n a n g u l a r

c a r b o n compound,

30

a

? b r o u s c e l l u l o s e m a t e r i a l , 2 0

o f a

s h r e d d e d c e l l u l o s e

m a t e r i a l , a n d 10

o f

a

l e c i t h i n

l i q u i d d i s p e r s i o n .

1 8 . The method o f c l a i m

1 3 W h e r e i n

t h e c o m p o s i t i o n

f u r t h e r c o m p r i s e s g r a p h i t e .

1 9 . The method o f c l a i m

1 3 W h e r e i n

t h e c o m p o s i t i o n

f u r t h e r

c o m p r i s e s

c a l c i u m c a r b o n a t e .

2 0 .

The

method

o f

c l a i m 1 3 W h e r e i n t h e

c o m p o s i t i o n

f u r t h e r c o m p r o m i s e s m o d i ? e d h y d r o c a r b o n .

2 1 .

The

method

o f

c l a i m 1 3 W h e r e i n t h e

c o m p o s i t i o n

c o m p r i s e s 25

o f

a n a n g u l a r c a r b o n compound, 29.5

o f

a

? b r o u s

c e l l u l o s e

m a t e r i a l ,

5

g r a p h i t e ,

10

c a l c i u m

c a r b o n a t e , 15

modi?ed

h y d r o c a r b o n , a n d 15.5

o f

a

l e c i t h i n l i q u i d d i s p e r s i o n .

2 2 . The method o f c l a i m

1 3

W h e r e i n t h e ? u i d i s e x i s t i n g

d r i l l i n g m u d .

2 3 . The method

o f

c l a i m 1 3 Wherein t h e ? u i d i s a m i x t u r e

o f W a t e r

and sodium m o n t m o r i l l o n i t e .

2 4 . Amethod o f s e a l i n g a s u b t e r r a n e a n

Z o n e

p e n e t r a t e d by

a W e l l b o r e t o

r e s t o r e

l o s t

c i r c u l a t i o n

c o m p r i s i n g :

p e l l e t i Z i n g a c o m p o s i t i o n c o m p r i s i n g a f o r m a t i o n b r i d g

i n g

component, a

s e e p a g e

l o s s component,

a n

o i l

W e t t i n g

c o m p o n e n t

c o m p r i s i n g a l e c i t h i n

l i q u i d

d i s p e r s i o n , a n d

modi?ed

h y d r o c a r b o n

t o

f o r m

a

p e l l e t ;

c o n t a c t i n g t h e p e l l e t

W i t h a

? u i d t o form

a p i l l ; a n d

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US 6 , 8 6 1 , 3 9 2 B2

7

p l a c i n g t h e

p i l l

i n t o t h e

s u b t e r r a n e a n Z o n e , t h e r e b y

s e a l i n g

t h e s u b t e r r a n e a n Z o n e a n d r e s t o r i n g l o s t c i r c u l a t i o n .

2 5 . Amethod o f s e a l i n g a

s u b t e r r a n e a n Z o n e

p e n e t r a t e d by

a W e l l

b o r e

t o r e s t o r e l o s t c i r c u l a t i o n c o m p r i s i n g :

p e l l e t i Z i n g

a

c o m p o s i t i o n c o m p r i s i n g

a f o r m a t i o n

b r i d g

i n g component, a s e e p a g e l o s s component, a n o i l

W e t t i n g

c o m p o n e n t ,

m o d i ? e d

h y d r o c a r b o n , a n d g r a p h

i t e

to

form

a

p e l l e t ;

c o n t a c t i n g t h e

p e l l e t W i t h a

? u i d t o form

a

p i l l ;

a n d

p l a c i n g

t h e

p i l l i n t o

t h e

s u b t e r r a n e a n

Z o n e ,

t h e r e b y

s e a l i n g

t h e

s u b t e r r a n e a n

Z o n e a n d

r e s t o r i n g l o s t

c i r c u l a t i o n .

2 6 .

Amethod o f

s e a l i n g

a s u b t e r r a n e a n

Z o n e

p e n e t r a t e d by

a W e l l

b o r e

t o r e s t o r e l o s t c i r c u l a t i o n

c o m p r i s i n g :

p e l l e t i Z i n g a c o m p o s i t i o n c o m p r i s i n g a f o r m a t i o n b r i d g

i n g component,

a

s e e p a g e

l o s s

component, a n o i l

W e t t i n g

c o m p o n e n t ,

m o d i ? e d

h y d r o c a r b o n , a n d c a l

cium

c a r b o n a t e

t o form

a p e l l e t ;

c o n t a c t i n g t h e p e l l e t

W i t h

a ? u i d t o form a p i l l ;

a n d

p l a c i n g t h e p i l l i n t o t h e

s u b t e r r a n e a n

Z o n e ,

t h e r e b y

s e a l i n g

t h e

s u b t e r r a n e a n Z o n e a n d r e s t o r i n g l o s t c i r c u l a t i o n .

2 7 . A p e l l e t

f o r s e a l i n g a s u b t e r r a n e a n Z o n e

p e n e t r a t e d

by

a W e l l

b o r e

t o r e s t o r e l o s t

c i r c u l a t i o n

c o m p r i s i n g :

a

f o r m a t i o n b r i d g i n g

component

c o m p r i s i n g a n

a n g u l a r

c a r b o n

c o m p o u n d ,

a

s e e p a g e

l o s s component, and

a n o i l W e t t i n g

c o m p o n e n t .

2 8 .

The

p e l l e t

o f

c l a i m 27 W h e r e i n t h e

s e e p a g e l o s e

component

i s a ?brous

c e l l u l o s e m a t e r i a l .

2 9 .

The p e l l e t o f

c l a i m 27 W h e r e i n t h e

s e e p a g e

l o s s

component i s

a

s h r e d d e d c e l l u l o s e m a t e r i a l .

3 0 .

The p e l l e t o f

c l a i m

27

W h e r e i n t h e o i l W e t t i n g com

p o n e n t

i s

a l e c i t h i n l i q u i d

d i s p e r s i o n .

3 1 .

The p e l l e t o f

c l a i m

27

c o m p r i s i n g 40

o f

a n a n g u l a r

c a r b o n compound, 30 o f

a ? b r o u s

c e l l u l o s e m a t e r i a l , 20

o f a s h r e d d e d c e l l u l o s e m a t e r i a l ,

a n d

10 o f a

l e c i t h i n

l i q u i d

d i s p e r s i o n .

1O

1 5

25

8

3 2 .

T h e p e l l e t

o f c l a i m 2 7 f u r t h e r c o m p r i s i n g g r a p h i t e .

3 3 . The p e l l e t o f c l a i m 2 7 f u r t h e r c o m p r i s i n g c a l c i u m

c a r b o n a t e .

3 4 . The p e l l e t o f

c l a i m

2 7 f u r t h e r c o m p r i s i n g modi?ed

h y d r o c a r b o n .

3 5 .

The

p e l l e t

o f

c l a i m

27

c o m p r i s i n g 25 o f a n a n g u l a r

c a r b o n

compound, 29.5

o f

a

? b r o u s

c e l l u l o s e m a t e r i a l ,

5

g r a p h i t e , 10 c a l c i u m c a r b o n a t e , 15 modi?ed

h y d r o c a r b o n , a n d 1 5 . 5 % o f a l e c i t h i n l i q u i d d i s p e r s i o n .

3 6 . A p e l l e t f o r s e a l i n g a s u b t e r r a n e a n Z o n e p e n e t r a t e d b y

W e l l b o r e

t o

r e s t o r e

l o s t

c i r c u l a t i o n

c o m p r i s i n g :

a f o r m a t i o n

b r i d g i n g

c o m p o n e n t ,

a

seepage l o s s component,

a n

o i l

W e t t i n g component

c o m p r i s i n g

a l e c i t h i n

l i q u i d

d i s p e r s i o n ,

a n d

m o d i ? e d

h y d r o c a r b o n .

3 7 . A p e l l e t f o r s e a l i n g a s u b t e r r a n e a n Z o n e

p e n e t r a t e d

b y

a W e l l b o r e t o

r e s t o r e

l o s t

c i r c u l a t i o n

c o m p r i s i n g :

a f o r m a t i o n

b r i d g i n g

c o m p o n e n t ,

a

seepage

l o s s component,

a n o i l W e t t i n g c o m p o n e n t ,

m o d i ? e d h y d r o c a r b o n , a n d

g r a p h i t e .

3 8 . A p e l l e t f o r s e a l i n g a s u b t e r r a n e a n Z o n e

p e n e t r a t e d

b y

a Well bore t o r e s t o r e l o s t

c i r c u l a t i o n :

a

f o r m a t i o n b r i d g i n g c o m p o n e n t ,

a

seepage

l o s s component,

a n o i l

W e t t i n g

c o m p o n e n t ,

m o d i ? e d

h y d r o c a r b o n ,

a n d

c a l c i u m

c a r b o n a t e .