Title of article :
Evaluation of gas well productivity in low permeability gas reservoirs based on a modified back-pressure test method
Author/Authors :
WANG، نويسنده , , Hui and ZHANG، نويسنده , , Peijun and CHENG، نويسنده , , Youyou and LENG، نويسنده , , Youheng and GUO، نويسنده , , Chunqiu and SHI، نويسنده , , Haidong and Wei، نويسنده , , Zhanjun and Liu، نويسنده , , Lingli and SHI، نويسنده , , Liyong and CHENG، نويسنده , , Muwei and XIANG، نويسنده , , Hongying، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
4
From page :
500
To page :
503
Abstract :
In view of the long pressure stabilization time of low permeability gas reservoirs, the traditional backpressure test was modified based on the idea of isochronal test in order to evaluate gas well productivity accurately. Firstly, carry out continuous well startup using 3–4 incremental working systems at the same time interval without the bottom-hole flowing pressure reaching stability; then carry out a prolonged test using a reasonable working system which requires both the bottom-hole flowing pressure and the production reaching stability; finally shut in the well to allow the pressure recover to formation pressure. If the isochronal test productivity calculation method is borrowed for the modified backpressure test, the drawdown pressure will be overestimated, and calculated productivity will be underestimated. The “process conversion-flowing pressure correction” was used to convert the test process into an isochronal test process, and the bottom-hole flowing pressure correction equation was deduced based on pressure superposition principle to solve the productivity calculation problem with this method. The example indicates that the modified backpressure test method can not only shorten the test time significantly and avoid frequent well startup and shut-in, but also can ensure the accuracy of productivity calculation.
Keywords :
bottom-hole flowing pressure , low permeability gas reservoir , modified backpressure test , “process conversion-flowing pressure correction” , productivity evaluation
Journal title :
Petroleum Exploration and Development
Serial Year :
2014
Journal title :
Petroleum Exploration and Development
Record number :
2301119
Link To Document :
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