煤系烃源岩凝析气藏改造技术研究与应用  

Research and application of condensate reservoir stimulation technology of coal measure hydrocarbon source rock

作　　者：杨立峰[1,2] 谢正凯[3] 卢拥军[1,2] 杨振周[1,2] 许志赫[1,2] 

机构地区：[1]中国石油天然气集团公司油气藏改造重点实验室,河北廊坊065007 [2]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [3]中国石油天然气集团公司科技管理部,北京100011

出　　处：《石油钻采工艺》2013年第5期59-63,70,共6页Oil Drilling & Production Technology

基　　金：国家科技重大专项"低渗;特低渗油气储层高效改造技术"(编号:2008ZX05013-004)

摘　　要：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。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.

关 键 词：煤系烃源岩 凝析气藏 压裂 线性胶 缝高控制 先导性试验 

分 类 号：TE357.1[石油与天然气工程—油气田开发工程]