摘要
深层裂缝型碎屑岩储层埋藏深、地层压力高、天然裂缝发育，钻、完井时工作液极易沿着裂缝大量漏失，形成“非径向、网络状”的污染带，表现出伤害深、污染重的特征，因此压裂酸化改造是这类储层投产的关键。压裂时容易产生多缝、滤失量大，造成极高的砂堵风险；基质酸化酸液有效作用距离有限，无法有效解除深部伤害。网络裂缝酸化工艺技术可以解决上述难题：在高于地层破裂压力下注酸，依靠酸液的高反应活性、高缓速和低摩阻的特性，采用大排量注入酸液溶蚀裂缝堵塞物和充填矿物来解除地层深部污染，在近井地带建立起网状流动通道。讨论了网络裂缝酸化的机理、工艺特点、适用条件、实现方式及应用方法。G10井经过网络裂缝酸化工艺处理后，产量从1．0×10^4m^3／d增加到6．2×10^4m^3／d，对类似储层的改造具有重要借鉴意义。
The deep fractured clastic reservoirs are characterized by deep bury, high formation pressure and devel- oped natural fractures. Working fluid tends to lose along fractures during drilling and completion and form a polluted ＂non-radial network＂ zone with deep damage and severe pollution characteristics. So the reformation by fractu- ring acidizing is the key of putting this kind of reservoirs into production. Multi-fractures and much filtration loss caused by fracturing could lead to the superhigh risk of sand up. Deep damage is hard to be relieved effectively due to the limited effective distance of matrix acidizing fluid. The acidizing technique for network fractures can solve the above problems： Acidizing fluid is injected at the pressure higher than the formation fracture pressure; relying on the high reaction reactivity, high slow-speed and low friction drag of acidizing fluid, volumes of acidizing fluid are injected to corrode the stemming and the filled minerals in fractures to relieve the deep formation pollution, with network flow channels being built near the wellbore zone. This paper discusses the mechanism, process features, applicable conditions, realization manner and application methods of network fracture acidizing. After the acidizing technique for network fracture is applied to Well G-10, production rate increases from 1.0×10^4m^3/dto 6.2×10^4m^3/d, which has the important reference meaning for the reformation of similar reservoirs.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2011年第4期101-104,共4页
Petroleum Geology & Oilfield Development in Daqing
基金
国家自然科学基金项目“油气层岩矿酸损伤理论研究”（2008ZX05002-004-009HZ）.
关键词
深层裂缝性碎屑岩
压裂酸化
网络裂缝酸化
deep fractured clastic rock
fracturing acidizing
network fracture acidizing
