鸭西背斜钻井提速技术试验及效果分析

Experiment of Improving Drilling Speed in Anticline of West Yaerxia and Effect Analysis

摘要:

鸭儿峡油田白垩系油藏鸭西背斜，地层倾角大、夹层多、研磨性强、可钻性差。钻进中直井段易斜；PDC钻头选型难度大，定向钻井时，工具面稳定性差、“托压”严重；钻井液性能要求高，常因与地层配伍性差，导致井下复杂情况发生，严重制约钻速提高。本文针对制约钻速提高的难点，通过现场试验效果分析来阐述鸭西背斜鸭K区块钻井提速措施，包括直井段防斜打直技术、水力振荡器试验、PDC钻头个性化试验、钻具组合选择和优化钻井液性能等，通过现场试验，为鸭西背斜钻井提速积累了成功经验。

Abstract:

Yaerxia oilfield is located in the anticline of west Yaerxia Cretaceous reservoir with high formation dip, much interlayer, strong abrasiveness and poor drillability. Deviation often occurs in vertical drilling and tool face stability is poor with serious back pressure in directional drilling, the selection of PDC bit types is difficult. Due to the poor compatibility with the formations, complicated downhole problems would be caused, which seriously restrict the drilling speed-increasing, the drilling fluid performance should be suitable. Aiming at the difficulties of restricting drilling speed-increasing, through the analysis on the field test results, this paper illustrates the drilling speed-increasing measures in Ya K block, including deviation control with straight well drilling, hydraulic oscillator test, PDC bit personalized test, bottom hole assembly selection and optimization of drilling fluid performance, etc. By the field tests, successful experience of the drilling speed-increasing has been accumulated for Ya K block.