论文部分内容阅读
地质特点及固井难点 冀东油田高尚堡构造为砂岩类油气田,其形态、大小、厚度、分布极不规则。平均完钻井深3800—4000 m,裸眼井段为1000 m。该构造存在着不同的压力系统,出现了高压气层和异常的高压层。由于长期开发注水,地层连通性较好,砂岩地层渗透性大,泥岩极易垮塌,井眼呈“糖葫芦状”。加之断层发育,注采不平衡,形成了许多“憋压层”、“负压层”和“动压层”。在钻井过程中,经常出现上部地层漏失,下部
Geological characteristics and difficulty of cementing Jidong Oilfield Gaoshangbao structure sandstone oil and gas fields, its shape, size, thickness, distribution is extremely irregular. Drilling depth average 3800-4000 m, open hole section of 1000 m. There are different pressure systems in this structure, with high pressure gas layers and abnormal high pressure layers. Due to the long-term development of water injection, the formation connectivity is good, permeability of sandstone formations, mudstone easily collapsed, borehole was “sugar calabash-like.” Coupled with the development of faults, imbalance between injection and production, the formation of many “pressure layer”, “negative pressure layer” and “dynamic pressure layer.” In the drilling process, the upper part of the formation often leaks, the lower part