Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (5): 61-69.doi: 10.12108/yxyqc.20190507

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Gas-water distribution characteristics in S48 block, western Sulige Gas Field

FENG Qianghan1, YANG Shengguo1, XIONG Zhe1, GAO Hang1, ZHANG Jiachao1, YANG Yi2, YANG Zhen3   

  1. 1. No.3 Gas Production Plant, PetroChina Changqing Oilfield Company, Wushenqi 017300, Inner Mongolia, China;
    2. School of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    3. Department of Geology, Northwest University, Xi'an 710069, China
  • Received:2019-01-25 Revised:2019-04-29 Online:2019-09-21 Published:2019-09-16

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Abstract: He 8 member and Shan 1 member are the main production layers in western Sulige Gas Field. The gaswater relationship is complex,and most of the gas wells produce water,which seriously affects the normal production of gas wells and deployment plan design of blocks. Based on gas test and dynamic monitoring data,the differences of production curve characteristics between water-producing gas wells and non-water-producing gas wells in block S48 of western Sulige Gas Field were analyzed. The production wells were divided into three types:non-water-producing in gas test and production process,non-water-producing in gas test but producing water in production process,producing water in gas test and production process. Then the characteristics of logging curve of water-producing well were analyzed by the constraint of dynamic production date and gas test data. The results show that:For the wells with non-water-producing in gas test but water-producing in production process, if logging data reflects good,gas test conclusion is gas layer,then the water source is mostly from the upper and lower adjacent layers;if the logging response is poor and the gas test conclusion is gas layer,the water source is mostly from the capillary water in the production layer. For the wells that with water-producing in gas test and production process,the logging interpretation and gas test conclusions are mostly gas-water layers,the water source is mostly from free water and capillary water in the production layer. Comprehensive analysis of logging data combined with gas test and production data is useful to identify gas and water layers. Gas-bearing layer and gas-water layer have similar logging response characteristics,and they are all distributed in the transitional zone between gas layer,dry layer and water layer in the resistivity-acoustic moveout crossplot. Five types of gas-water distribution were divided:pure gas,gas above the water,dry(water) above the gas,gas-water coexi-stence,gas layer inter-distributed between dry/water layer. Engineering reform measures were proposed for different types of gas-water distribution.

Key words: water-producing well, gas-water distribution, free water, capillary water, logging response, Sulige Gas Field

CLC Number: 

  • TE341
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