低压裂缝性火山岩水平井提速难点及对策

Difficulties in raising of horizontal drilling rates in lowpressurefractured volcanic rocks and solutions

摘要:

松南火山岩地层研磨性强、可钻性差，该区钻井施工机械钻速低、钻井周期长，且随着勘探开发的不断推进，火山岩裂缝性储层孔隙压力逐步降低，目前，开发井型主要以水平井为主，井漏问题突显，严重制约钻井提速。本文针对这一问题，从地质特点及钻井技术难点出发，结合近年来松南火山岩钻井技术的进展，对现有技术进行评价及优化，并通过现场应用结果，提出适合该地区后续钻井提速的措施及建议。

关键词:火山岩;水平井;井漏;井身结构优化;仪器工具改进;钻井提速

Abstract:

The Songnan volcanic rock stratum has strong abrasiveness and poor drillability, leading to low drilling rates and long drilling periods. With the continuous advancement of exploration and development, the pore pressure of volcanic fractured reservoirs decreases gradually. At present, the development well type is mainly horizontal wells, where drilling rates are restricted due to acute circulation loss. In view of this problem, this paper describes the geological characteristics and the drilling difficulty with evaluation and optimization of the existing technology in regard to the progress on drilling technology for the Songnan volcanic rock in recent years. The measures and recommendations are presented for increase of the drilling rate in subsequent drilling in the region on the basis of field application results.

Key words:volcanic rock; horizontal wells; lost circulation; well structure optimization; instrument improvement; increase the drilling rate