超深水平井钻井技术

Drilling techniques for ultra-deep horizontal wells

陈世春 王树超

CHEN Shi-chun WANG Shu-chao

华北石油管理局塔里木钻井工程公司, 河北任丘 062552

Tarim Drilling Company of Huabei Petroleum Administration Bureau, Renqiu 062552, Hebei, China

水平井的施工风险和难度随施工井深的增加而增加,特别是6000 m以上的超深水平井,存在着较高的施工风险和难度。塔里木油田东河塘区块油藏深度在5740 m左右,目前已先后完成了6口单、双台阶超深水平井,完钻井深均在6300 m以上。水平井投产后,油气产量明显提高,水平井平均单井油气产量为开发水平井前单井产量的3~5倍,取得较好的效果,经济效益显著。通过6口水平井的施工,超深水平井技术也在不断完善和提高,已日臻成熟。针对塔里木油田东河塘地区自身特点,以东河1-H3井和东河1-H5井为例,从难点分析、优化钻井设计、轨迹控制、分段技术措施、水平井钻井液等方面作了较详细的论述。该区块水平井的成功经验,对超深水平井施工有一定的指导和借鉴意义。

It is more difficult and hazardous to drill horizontal wells,especially ultra-deep wells of more than 6000 meters,as the drilling gets deeper.In recent years,horizontal drilling techniques have been applied in Tarim Oilfield to comprehensively develop Donghetang region.Six one-step and two-step ultra-deep horizontal wells have been completed in the block one after another,with the drilling depth more than 6300 m on average.The oil and gas output increases considerably in Donghetang oil-gas region after the horizontal wells are put into operation.As a result,the single-well output is three to five times higher than before.Good effect and remarkable economic benefits are obtained.Based on drilling these six horizontal wells,the drilling techniques for ultra-deep horizontal wells are increasingly improved and gets more mature.According to the characteristics of Donghetang region,this paper takes Well Donghe 1-H3 and Well Donghe 1-H5 as an example to introduce such aspects as difficulty analysis,optimizing drilling program design,trajectory control,segmental technical measures,and horizontal drilling fluid in detail.The success obtained from drilling the horizontal wells in the region is a good reference to drilling ultra-deep horizontal wells.

10.3969/j.issn.1000-7393.2007.04.002