摘要
致密砂岩储层压裂效果评价方法较多,常规的压力恢复试井和净压力拟合等方法需要较多的测试数据,存在一定的局限性。因此,需找到一种快速准确的方法来评价储层的压裂效果。基于压降试井理论对压裂施工停泵后的压降数据进行分析,建立了致密砂岩压裂气井不稳定渗流数学模型,得到停泵后井底压力和压力导数的双对数曲线,通过双对数曲线可对压裂后的储层参数及裂缝特征进行评价。实例应用通过对比净压力的拟合结果和压裂后压力恢复试井的解释成果,验证了该方法的准确性。该方法充分利用压裂施工压力数据评估压裂效果,认识储层特性,可为优化压裂设计和现场压裂施工方案提供参考依据。
There are many methods for evaluating the fracturing effects of tight sandstone reservoirs. And the con- ventional evaluation methods （ e.g. build-up test and net pressure fitting） need more testing data, so their applica- tion is, in a way, limited. Therefore, it is necessary to develop a new method to evaluate reservoir fracturing effects quickly and accurately. In this paper, the pressure drop data after the termination of pumping was analyzed accord- ing to drawdown test theories. Then, a mathematical model for the unsteady flowing of gas wells used for the fractu- ring of tight sandstones was established. And finally the log-log graph of bottom hole pressm-e and its derivative after the termination of pumping was plotted. Based on the log-log graph, the reservoirs parameters and fracture charac- teristics after the fracturing operation can be evaluated. Its accuracy is verified actually by comparing the fitting re- sults of net pressure with the interpretation results of build-up test after the fracturing operation. In this method, fracturing effects are evaluated by making full use of pressure data of fracturing operation, and the reservoir charac- teristics are understood. It provides the reference and basis for the optimization of fracturing design and fracturing operation plans.
作者
周珺
邓睿
韩旭
李成勇
Zhou Jun Deng Rui Han Xu Li Chengyong(SINOPEC Research Institute of Petroleum Engineering, Beijing 100101, China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101, China Chengdu University of Technology, Chengdu, Sichuan 610059, China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2017年第2期165-169,共5页
Special Oil & Gas Reservoirs
基金
国家自然科学基金“页岩储层原始地应力仿真与局部人工扰动规律研究”(51304032)、“页岩储层纳米孔隙结构表征及渗流机理研究”(5167040659)
关键词
致密砂岩
压降试井
停泵压降
测试压裂
压裂效果
tight sandstone
drawdown test
pump-off pressure drop
mini fracturing
fracturing effect
