摘要
富油凹陷二次勘探是实现老区持续增储的关键,但面临越来越多的深层、低渗透、特殊岩性等复杂油气藏,需要措施改造才能获得工业油气流。以渤海湾盆地冀中坳陷和二连盆地为例,针对低渗透薄稠油层改造易伤害、流动差、缝高控制难的技术难题,形成了"规模适度、中等砂比、全程防膨、高效降黏"的精细改造模式;针对超深超高温超高应力的碳酸盐岩潜山油气藏难以实现深度酸压改造的技术难题,研制了耐200℃高温耐剪切性能的超高温聚合物压裂液,优选出缓速效果突出、具有固液转向功能的清洁酸液体系,形成了"前置探缝、固液转向、多级注入、闭合酸化"的体积酸压改造模式;针对高含黏土砂砾岩低渗透储层改造易伤害、易敏感、易砂堵的技术难题,研制了岩心损害率由以往的38.6%降低到13.4%的滑溜水及低浓度压裂液体系,并配套形成"复合压裂、前置投球、多层分压"的低伤害复合体积改造模式。在蠡县斜坡、牛东潜山、阿尔凹陷综合应用106井次,整体改造效果较以往提高1.5倍以上,有效支撑了富油凹陷二次勘探新领域的增储上产。
TThe secondary exploration of oil-rich sags is the key to realize sustainable reserve increasing of old areas. However,there are more and more complex oil and gas reservoirs that are characterized by deep burial depth, low permeability or special lithology,so it is necessary to take some stimulation measures to get industrial oil and gas flow. The Jizhong Depression in the Bohai Bay Basin and the Erlian Basin are taken as the examples for study. First, it is technically difficult to stimulate thin heavy oil reservoirs of low permeability, which could be damaged easily, their mobility is poor and the fracture height cannot be controlled easily. To solve these technical difficulties, the fine stimulation pattern of “moderate scale, moderate sand ratio, whole-process antiswelling and efficient viscosity reducing” was established. Second, it is difficult to carry out in-depth acid fracturing stimulation in ultradeep buried-hill carbonateoil reservoirs with ultrahigh temperature and stress. To solve this technical difficulty, the ultrahigh temperature polymer fracturing fluidwhich has the resistance to high temperature 200 ℃ and shearing was prepared, the clean acid system with the excellent retarding effectand solid-liquid diversion capacity was optimized, and the volume acid fracturing stimulation pattern of “fracture detection in pad, solidliquiddiversion, multi-stage injection and closed acidizing” was established. And third, it is difficult to stimulate the low-permeabilityglutenite reservoirs with high clay content for they are sensitive and could be damaged and plugged with sand easily. To solve thisproblem, slick water and low-concentration fracturing fluid system was developed to reduce the damage rate from 38.6% to 13.4%,and the low-damage complex volume stimulation pattern of “compound fracturing, seal ball fracturing in pad and multi-layer separate fracturing” was established. The measures had been applied in Lixian slope, Niudong buried hill and Aer sag for 106 well times and the stimulation
作者
赵贤正
才博
金凤鸣
罗宁
王霞
何春明
ZHAO Xianzheng;CAI Bo;JIN Fengming;LUO Ning;WANG Xia;HE Chunming(PetroChina Dagang Oilfield Company, Tianjin 300000, China;Langfang Branch of PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065000, Hebei, China;Hangzhou Branch of PetroChina Research Institute of Petroleum Exploration & Development, Hangzhou 300023, Zhejiang, China;PetroChina Huabei Oilfield Company, Renqiu 062550, Hebei, China)
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2016年第6期823-831,共9页
Oil Drilling & Production Technology
基金
国家重大科技专项(2016ZX05023-005)
中国石油天然气股份有限公司重大科技专项(2014E-035
2014B-1202)资助
关键词
复杂油气藏
蠡县斜坡
牛东潜山
阿尔凹陷
致密油
精细压裂
超高温压裂液
体积酸压
complex oil and gas reservoir
Lixian slope
Niudong buried hill
Aer sag
tight oil
fine fracturing
ultrahigh temperature fracturing fluid
volume acid fracturing
