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工作液顺序接触诱发超致密砂岩气藏液相圈闭损害评价
张杜杰,金军斌,康毅力
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(1.中国石化石油工程技术研究院,北京100101;2.页岩油气富集机理与有效开发国家重点实验室,北京100101;3.西南石油大学油气地质及开发工程国家重点实验室,四川成都610500)
摘要:
液相圈闭损害一直被认为是致密砂岩气藏储层损害的重要机理。由于储层物性特征及工作液类型不同,超致密砂岩气藏的液相圈闭损害程度和损害机理存在差异。为此,以塔里木盆地超致密砂岩气藏为例,建立模拟钻井—中途测试—压井作业—完井测试等4个阶段实际作业环节的油基/有机盐钻开液滤液—有机盐完井液顺序接触诱发超致密砂岩气藏综合液相圈闭损害的评价方法,并选取典型超致密砂岩气藏基块及裂缝样品开展实验评价。结果表明:基块油基/有机盐钻开液滤液—有机盐完井液顺序接触后的综合液相圈闭渗透率损害率分别为86.00%和98.37%;裂缝油基/有机盐钻开液滤液—有机盐完井液顺序接触后的综合液相圈闭渗透率损害率分别为99.95%和63.45%。分析发现:超致密砂岩气藏特殊的黏土矿物类型和产状以及狭小喉道导致油基钻开液滤液抑制基块后续水基工作液侵入;裂缝内残留的油基钻开液滤液(油滴)在后续气驱返排过程中阻碍有机盐完井液的返排及蒸发是油基钻开液缓解基块综合液相圈闭损害、加剧裂缝综合液相圈闭损害的主要机理。
关键词:  超致密砂岩  气藏  油基钻开液  液相圈闭  顺序接触  塔里木盆地
DOI:10.13673/j.cnki.cn37-1359/te.2020.06.014
基金项目:国家科技重大专项“海相碳酸盐岩超深油井关键工程技术”(2017ZX05005-005)和“彭水地区常压页岩气勘探开发示范工程”(2016ZX05061),国家自然科学基金企业联合基金“海相深层油气富集机理与关键工程技术基础研究”(U19B6003-05-03-02)。
Evaluation of comprehensive liquid trapping damage of ultra-tight sandstone gas reservoir induced by sequential contact of working fluids
ZHANG Dujie,JIN Junbin,KANG Yili
(1.SINOPEC Research Institute of Petroleum Engineering,Beijing City,100101,China;2.State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing City,100101,China;3.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China)
Abstract:
Liquid trapping damage has always been considered as an important reservoir damage mechanism of tight sandstone gas reservoirs. The degree and mechanism of the liquid trapping damage of ultra-tight sandstone gas reservoirs vary with different physical characteristics and working fluid types of reservoirs. In this paper,we studied the ultra-tight sandstone gas reservoirs in the Tarim Basin. The evaluation method simulating the four stages of drilling-drill stem test-killing operations-completion testing was proposed to test the comprehensive liquid trapping damage induced by the sequential contact of oil-based/organic salt drill-in fluid filtrates-organic salt completion fluids. The typical matrix and fractured samples were selected. The results showed that the permeability damage rates(PDRs)of comprehensive liquid trapping of the matrix sample treated by the sequential contact of oil-based/organic salt drill-in fluid filtrates-organic salt completion fluid were 86.00% and 98.37%,respectively. The corresponding two parameters of fractured samples were 99.95% and 63.45%,respectively. Analysis indicates that the special clay mineral types,occurrence,and narrow throats of ultra-tight sandstone gas reservoir cause oil-based drill-in fluid filtrates to suppress the intrusion of the subsequent water-based working fluids for the matrix sample. That the remaining oil-based drill-in fluid droplets in the fractures obstructing the flowback and evaporation of the organic salt completion fluid during the subsequent flowback process is the main mechanism for the oil-based drill-in fluids’mitigating the comprehensive liquid trapping damage of matrix and aggravating the comprehensive phase trapping damage of fractures.
Key words:  ultra-tight sandstone  gas reservoirs  oil-based drill-in fluids  liquid trapping  sequential contact  Tarim Basin

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