CAJ | 학술논문

为提高致密砂岩气藏的开发效益，基于储层工程地质特征、单井测录井、随钻伽马等资料，采用三维两相模型气藏数值模拟和全三维网络模型裂缝数值模拟相结合的方法，优化了丛式水平井井组的裂缝整体布局、裂缝参数和施工参数。盒1层、山1层和太2层的参数优化结果为：裂缝采用等间距交错布局，缝间距150 m ，裂缝数量7～9条，裂缝半长150～200 m ，裂缝导流能力30 D · cm ；施工排量4.0～5.0 m3/min ，前置液体积分数35％～40％，平均砂比21％～25％，单段加砂量35～45 m3。DP43H和DPT 27丛式水平井井组压裂后无阻流量分别达到77.6×104和73.2×104 m3/d ，平均单井无阻流量分别为12.9×104和18.3×104 m3/d ，比同层位邻井分别提高1.5和2.2倍，压裂施工时间比单井累计施工时间分别缩短11和17 d。研究结果表明，丛式水平井井组压裂技术是致密砂岩气藏提高单井产量、缩短施工周期、降低施工成本的有效手段。
위제고치밀사암기장적개발효익，기우저층공정지질특정、단정측록정、수찬가마등자료，채용삼유량상모형기장수치모의화전삼유망락모형렬봉수치모의상결합적방법，우화료총식수평정정조적렬봉정체포국、렬봉삼수화시공삼수。합1층、산1층화태2층적삼수우화결과위：렬봉채용등간거교착포국，봉간거150 m ，렬봉수량7～9조，렬봉반장150～200 m ，렬봉도류능력30 D · cm ；시공배량4.0～5.0 m3/min ，전치액체적분수35％～40％，평균사비21％～25％，단단가사량35～45 m3。DP43H화DPT 27총식수평정정조압렬후무조류량분별체도77.6×104화73.2×104 m3/d ，평균단정무조류량분별위12.9×104화18.3×104 m3/d ，비동층위린정분별제고1.5화2.2배，압렬시공시간비단정루계시공시간분별축단11화17 d。연구결과표명，총식수평정정조압렬기술시치밀사암기장제고단정산량、축단시공주기、강저시공성본적유효수단。
In order to improve the development benefit of tight sandstone gas reservoir ,based on the engineering geological characteristics of reservoirs ,single well logging data ,and measurement of gamma while drilling ,the overall fracture pattern ,fracture parameters and treatment parameters of horizontal well cluster were optimized by combining the numerical simulations of three-dimensional two-phase reservoir model and full three-dimensional network model .As a result ,He 1 ,Shan 1 and Tai 2 formations were opti-mized to a crossing fracture pattern with equal spacing (150 m) ,containing 7 9 fractures with half length of 150 200 m and conductivity of 30 D · cm ,and other parameters including 4.0 5.0 m3/min displacement , 35% 40% prepad ,21% 25% average proppant concentration and 35 45 m3 sand content in single segment . Field application showed that ,after fracturing ,two horizontal well clusters(i .e .DP43H six-well cluster and DPT 27 four-well cluster)achieved open-flow capacity of 77.6 × 104 and 73.2 × 104 m3/d respectively ,with single well open-flow capacity of 12.9 × 104 and 18.3 × 104 m3/d ,which were 1.5 times and 2.2 times of that offset wells in the same formation .Moreover ,the fracturing time of the two well was 11 d and 17 d less than the accumulative time of wells .It is therefore concluded that the horizontal well cluster fracturing technology is an effective solution to improve the single well production ,shorten the treatment period ,and reduce the cost of fracturing .