王官屯油区失稳地层密闭取心技术  

Sealing Core Drilling Technique for Unstable Formation in Wangguantun Oil Region

作　　者：赵海锋 杨灿 吴华[2] 饶开波 张明 杨巍 

机构地区：[1]中国石油渤海钻探第一钻井公司,天津300280 [2]大港油田采油工艺研究院钻井工艺室,天津300280

出　　处：《辽宁化工》2017年第9期900-902,共3页Liaoning Chemical Industry

基　　金：渤海钻探第一钻井公司工艺研究项目<大港南部油区复杂区块钻完井技术研究>;项目号:2017ZY03Y

摘　　要：随着勘探开发的地质目的要求越来越高,工艺技术逐渐精细化发展,密闭取心技术运用越来越广,但在稳定性较差井段进行密闭取心较为少见。大港油田王官屯油区官104断块目的层取心设计在孔一段,地层稳定性差,易跨易漏,岩心易碎,严重影响取心成功率和收获率,密闭率难以保障,密闭取心难度极大。该区块井:官78-28-2井设计在失稳地层连续取心,设计密闭取心进尺75 m。施工中共计取心12趟,期间共发生漏失3次。该井采用了特殊地层钻井液控制技术、井壁强化堵漏技术,运用合理的取心工艺技术完成了连续密闭取心,密闭取心收获率为93.30%,密闭率为88.46%,超过取心设计要求,最终确保了易漏层连续密闭取心质量合格,为同类井的施工提供了经验。In the oil exploration industry, the data of reservoir is becoming more and more important, which makes the development of drilling technology very fine, in which the sealing core drilling technique is used more and more widely. But it is rare to have closed coring in the unstable stratum. The coring design of Guan 104 fault block layer in Dagang oilfield Wangguantun oil region is in Ek1. Ek1 formation stability is poor, and easy to collapse and leak, and the core is fragile, which seriously affects the success rate of the coring and harvesting rate. In the fault block wells, design of Guan78-28-2 continuous coring is in unstable strata and coring footage is 75 m. 12 coring operations have been completed during construction（3 times leakage occurred during this period）. Based on special formation drilling fluid control technology and borehole reinforcing plugging technology, continuous closed coring was completed by reasonable coring process, the coring recovery rate reached to 93.30%, with a closure rate of 88.46%, exceeding the requirements.

关 键 词：密闭取心 失稳 连续取心 收获率 密闭率 

分 类 号：TE122[石油与天然气工程—油气勘探]