基于侵入固相返排的低孔低渗气藏测试压差模型

Differential pressure model for testing low-porosity and low-permeability gas reservoir based on discharged invading solids

张海山 邱康 李三喜 王宏民 段飞飞 秦丙林

ZHANG Haishan QIU Kang LI Sanxi WANG Hongmin DUAN Feifei QIN Binglin

中海石油中国有限公司上海分公司 中石化海洋石油工程有限公司

Shanghai Branch Company of CNOOC China, Shanghai 200030, China CNOOC Offshore Oil Engineering Co. Ltd., Shanghai 200120, China

地层测试时，考虑井壁稳定、出砂、管柱安全等问题，测试压差一般仅考虑上限要求，而采用过低的测试压差将导致地层侵入固相无法有效地返排。针对侵入固相返排所需要的最小压差问题，考虑侵入固相返排所需的拖拽力，结合低孔低渗气藏渗流特性，建立了低孔低渗气藏测试压差下限模型。高于模型计算的测试压差，才可以有效地排出地层侵入物，获得更好的产能和更加真实的地层数据。现场应用表明，该模型能够提供满足现场需求的测试压差下限，可为测试压差的设计提供参考。

With consideration of side-wall stability, sand production, toolstring safety and other problems, only the upper limits of differential pressure are reviewed during formation test. In fact, invading solids in formations may not be discharged effectively at low testing differential pressure. With consideration of the minimum differential pressure required for discharging invading solids, the model for lower limits of differential pressure for testing low-porosity and low-permeability gas reservoir was constructed to take dragging forces required for discharging invading solids and seepage characteristics of low-porosity and low-permeability gas reservoirs into account. Invading solids can be effectively discharged, together with higher productivities and more accurate formation data can be measured at differential pressure higher than that calculated using the newly developed model. Field application results show the model can satisfactorily determine the testing differential pressure required for field operation and provide necessary references for designing the pressure .

10.13639/j.odpt.2016.05.021