CAJ | 학술논문

二次加砂压裂作为一项针对特殊储集层发展起来的应用工艺技术,在形成短宽缝、避免裂缝穿层方面优势明显,在现场得到了成功应用.但由于未针对二次压裂开展相关理论研究,导致现场设计存在极大的盲目性.在考虑砂堤高度随时问不断变化对流体压降影响的基础上,建立了适用于二次加砂压裂的裂缝延伸模型;考虑支撑剂的对流影响建立了支撑剂沉降运移模型,采用界面追踪求解支撑剂运移分布.编制程序对比分析了二次加砂压裂与常规压裂的裂缝参数.计算结果表明,二次压裂和常规压裂相比,支撑裂缝长度和高度减小,宽度明显增加,裂缝导流能力显著提高.根据油田实际物性特征,优化了二次加砂压裂工艺,实施后增产效果理想,具有推广应用价值.
이차가사압렬작위일항침대특수저집층발전기래적응용공예기술,재형성단관봉、피면렬봉천층방면우세명현,재현장득도료성공응용.단유우미침대이차압렬개전상관이론연구,도치현장설계존재겁대적맹목성.재고필사제고도수시문불단변화대류체압강영향적기출상,건립료괄용우이차가사압렬적렬봉연신모형;고필지탱제적대류영향건립료지탱제침강운이모형,채용계면추종구해지탱제운이분포.편제정서대비분석료이차가사압렬여상규압렬적렬봉삼수.계산결과표명,이차압렬화상규압렬상비,지탱렬봉장도화고도감소,관도명현증가,렬봉도류능력현저제고.근거유전실제물성특정,우화료이차가사압렬공예,실시후증산효과이상,구유추엄응용개치.
As a kind of applied technology for special reservoir development, the secondary sand fracturing is of obvious advantage in shaping short and wide fracture and avoiding fracture penetrating interlayer, which has been successfully applied in fields. However, for the lack of relevant theoretical research, the field design of it is still in great blindness. This paper presents the fracture-extending model for secondary sand fracturing considering the impact of sand bank height change with time on fluid pressure drop; the proppant sedimentation and migration model considering the proppant convection impact, by which the proppant migration and distribution is gained by interface tracing; and proposes related program for correlation and analysis of fracture parameters from both secondary sand fracturing and conventional fracturing. The calculated results indicate that the secondary san fracturing is characterized by decreases of the length and height, and obvious increases of the width and conductivity of proppant fractures. According to the real reservoir petrophysical properties, the optimized secondary sand fracturing technology has satisfactory effect for stimulation, being worthy of popularization and application.