草古100潜山水平井固井油气层保护技术

RESERVOIR PROTECTION TECHNOLOGY FOR CEMENTING HORIZONTAL WELLS IN BLOCK CAOGU 100

张明昌 张宏军

Zhang Mingchang Zhang Hongjun.et al

胜利石油管理局黄河钻井固井公司, 山东东营 257200

Yellow River Drilling and Cementing Company of Shengli Petroleum Administration

草古 100区块是草桥油田的 1个潜山稠油藏区块,计划钻 10口水平井以提高产量,采用筛管完井。在?2 44.5mm技术套管固井时,潜山油层已打开,水泥对油层污染严重,前 2口井固技术套管时未采取油气层保护措施,产量较直井提高不明显。为解决此问题,研究使用了?2 44.5mm技术套管固井油气层保护技术,使平均单井原油产量提高 142%,取得了较好的效果。文中介绍了潜山油藏特点及采用二级注水泥方法,采用连续打开式分级箍、水泥伞。一级固水泥,先固水泥伞以上 30m,凝固后再用打开式分级箍进行二级固水泥到井口。水泥伞的优点是,防止水泥浆直接冲击油层,达到防止压漏地层,起到保护油层的效果,在固的 8口井当中均取得较好的效果。

Ten horizontal wells are planed in block Caogu100, which is a buried hill thick oil reservoir in the Caoqiao oilfield, and screen pipe completions are designed. In cementing the ?244.5mm intermediate casing that run through the buried hill reservoir, great contamination is caused by cement slurry, and no notable production improving is found in the first two horizontal wells over the vertical wells. To solve this problem, reservoir protection programs designed for cementing the ?244.5mm intermediate casing are applied with success, and the average production rate increased by 142% per well. The features of buried hill reservoir are described, and the use of two-stage cementing method, continuous open stage collar and cement basket is also presented. The first stage cementing is conducted to isolate the formation above 30m of the cement basket, and the second stage cementing is carried out through the continuous open stage collar only after the setting of the first stage cement. The use of cement basket can keep the cement slurry form impacting the formation directly, which may cause lost circulation and formation damage, and enhances cementing quality therefor.

10.3969/j.issn.1000-7393.2001.03.007