choke rate calculation.pdf

7/28/2019 choke rate calculation.pdf

1/7

SARTA SC-A1

CH DST#1 SUMMARY

Perforation Interval: 2492m 2526m

DATED: 20th July 2010 27th July 2010


2/7

CH DST#1 SUMMARY REPORT

Depth Interval: 2492m -2526m

Operation Summary:

The first cased hole DST in block SARTA CENTRAL well SC-A1 was

planned in the interval 2492m-2526m. The well was perforated withTCP gun at 05:05 hrs on 21st July, 2010. After pressure testing of tooland inspection of all surface facilities, packer was set in the interval.

The drawdown was created by application of N2 through CTU on 24thJuly, 2010. The liquid flow was observed at 13:48 hrs after N2

application. The choke was decreased to 22/64. The flow wasobserved only when the N2 was pumped. After observing the well,

POOH of coil tubing started and well flow stopped 17:50 hours.Maximum H2S recorded is 4 %.

Samples were collected during flow and BS&W measured. The analysisis attached below.

LiquidOnsiteAnalysisChoke ChokeBS&W OilProperties

DateTime size Oil Water SG Temp. SG oAPI H2S CO2inch % % Observed degF 60degF 60degF % %

24Jul10

13:40 12813:55 12814:10 128 80.0 20.014:25 64 80.0 20.014:40 22 80.0 20.014:55 22 100.0 0.015:10 22 100.0 0.0 0.952 104.0 0.967 15 4.0 015:25 22 100.0 0.015:40 22 100.0 0.0 0.955 104.0 0.973 14 4.0 015:55 22 100.0 0.016:10 22 100.0 0.0 0.951 112.1 0.972 1416:25 22 100.0 0.016:40 22 100.0 0.016:55 32 100.0 0.017:10 32 100.0 0.0 0.925 104.0 0.943 19 4.0 017:25 32 100.0 0.0


3/7

SEQUENCE OF EVENTS

21/7/2

010

5:00 6:00 1:00 Well was perforated in the interval 2492-2526 m.

6:00 7:00 1:00 Observe well after perforation, well stable

24/7/2010

7:00 10:00 3:00Commenced RIH coil tubing, while pumping N2 andunloading tubing brine.

10:00 13:50 3:50

Continue RIH to 2133mtr and pump N2, observed

Hydrocarbons @surface

13:50 17:20 2:15

Clean up well while lifting with N2 pumping @400 scf/m,decreased choke size to 22/64" and BS & W measured,

samples collected. H2S 4% with hydrocarbons w/detector

tube.

17:20 22:00 4:40 POOH of CT unit while pumping N2.

22:00 7:15 9:15Well under observation and monitor annulus, observed

losses in annulus

25/7/2010

7:15 20:30 13:15 PO CT while circulating brine, CT @surface

20:30 14:00Continue kill operation, circulate brine for conditioning andflow check

26/7/2010

0:30 6:00 5:30 Circulate brine, proceed kill operation. Flow check

6:00 14:00 8:00Continue kill operation, circulate brine for conditioning and

flow check

14:00 21:00 7:00 POOH DST string on 3-1/2" tubing to 174 m.

21:00 1:30 4:30 POOH DST BHA, End of DST#1.


4/7


5/7

PLOT:


6/7

P& ID


7/7

Estimation of Flow Rate from choke data (Surface data): Well: SC-A1

The following empirical equation is used to calculate flow rate fromupstream pressure, GLR value and choke size.

(1)

WhereA,B,C and D are empirical constants whose values depend on thecorrelation used (namely, Gilbert and Ross)

Pi = Pressure upstream of choke, psia.

Ql = flowrate, STB/D

Fgl= gas liquid ratio, scf/stb.

d= chokesize, in terms of /64.

The above equation gives value of Q if all other are known.

GOR : 33 (v/v) taken for estimation

The result for SCA-1 can be tabulated as:

Remarks: Estimated Flow rate is during N2 Injection through coiltubing.

choke rate calculation.pdf

Documents