CAJ | 학술논문

针对煤系烃源成藏的H凹陷凝析气藏部分储层与邻近煤层之间的隔层应力差较小、裂缝高度不易控制的改造难点，通过理论研究制定了用线性胶携带多级支撑剂段塞控制裂缝高度的工艺方法，改变以往采用下沉剂控制裂缝向下延伸的控缝高的技术思路。针对储层泥质含量较高易伤害的特点，优选了低浓度羧甲基羟丙基瓜胶压裂液体系，并在前置液阶段混5%~10%柴油进行乳化降滤，降低储层伤害。通过改变工艺措施和工作液方案，确保了加砂压裂施工成功率和压后效果。在H10井进行了先导性试验，分压3层，采用三级段塞加砂，单层最大加入20~40目陶粒支撑剂35 m3，砂浓度最高570 kg/m3（砂比35%），平均砂浓度478 kg/m3（砂比27.5%）。3层压前无产量，压后返排率48%，合层试气求产日产天然气4×104 m3，凝析油0.4 t/d。井温测试和模拟分析表明，缝高、滤失和多裂缝均得到了有效控制。该井加砂压裂改造先导性试验的成功实施，为同类储层改造提供了借鉴。
침대매계경원성장적H요함응석기장부분저층여린근매층지간적격층응력차교소、렬봉고도불역공제적개조난점，통과이론연구제정료용선성효휴대다급지탱제단새공제렬봉고도적공예방법，개변이왕채용하침제공제렬봉향하연신적공봉고적기술사로。침대저층니질함량교고역상해적특점，우선료저농도최갑기간병기과효압렬액체계，병재전치액계단혼5%~10%시유진행유화강려，강저저층상해。통과개변공예조시화공작액방안，학보료가사압렬시공성공솔화압후효과。재H10정진행료선도성시험，분압3층，채용삼급단새가사，단층최대가입20~40목도립지탱제35 m3，사농도최고570 kg/m3（사비35%），평균사농도478 kg/m3（사비27.5%）。3층압전무산량，압후반배솔48%，합층시기구산일산천연기4×104 m3，응석유0.4 t/d。정온측시화모의분석표명，봉고、려실화다렬봉균득도료유효공제。해정가사압렬개조선도성시험적성공실시，위동류저층개조제공료차감。
To deal with the small stress difference between the reservoir and adjacent coal seams of the condensate gas reservoir in H depression of the coal source reservoir, the technology of carrying multi-stage proppant segment by linear gel is studies to control fracture height, instead of the conventional method of sinking agent. To deal with the high clay content of the formation, which may cause damage to itself, low concentration carboxymethyl hydroxypropyl guar fracturing lfuid was selected, and for the prepad slug, 5%~10%diesel was mixed to lower circulation loss by emulsifying. By changing the treatment process and fracturing liquid, the stimu-lation treatment obtained good results. Three zones fracturing pilot test was done on H10 well successfully. The maximum proppant volume was 35 m3 for single layer, with three proppant segment plugs. And the maximum proppant concentration is 570 kg/m3(sand liquid ratio is 35%). While the average proppant concentration is 478 kg/m3 (sand liquid ratio is 27.5%). The zones have no production before stimulation, but 48%of the fracturing lfuid has been lfowed back after fracturing, and the total gas production is 4×104 m3 and condensate oil production is 0.4 t/d. The well temperature test and simulation analysis show that the issues of fracture height, ifltration loss and multiple fractures have all been controlled effectively. The successful implementation of the pilot test provides a reference for similar reservoir stimulation.