摘要
Abstract
The Ziliujing Formation and Xujiahe Formation of Yuanba Gas Field is characterized by tight formation lithology, strong heterogeneity, high content of conglomerate (max. up to 50%), high formation abrasiveness, low drillability (over Level 8), and high drilling lfuid density (max. up to 2.4 g/cm3), great chip-holddown effect, low rock breaking efifciency, fast roller bit wear, small footage of single bit and low comprehensive beneift. They are the main intervals which hinder acceleration of drilling rate in Yuanba Gas Field. In order to address this problem, and in line with the drilling dififculties in high pressure tight abrasive formations in the deep continent facies of Yuanba, research and analysis was conducted on rock breaking mechanism starting from rock breaking tools, and a new power tool was proposed which aims to provide continuous torque, constant RPM and bit pressure for the bit, so as to increase the rock breaking capacity of the bit, reduce drill string vibration, decrease slippage and bit pressure lfuctuation during cutting, meanwhile, with high-efifciency PDC bit or impregnated diamond bit, to increase drilling efifciency. For this purpose, the new accelerating tool NEW-DRILL was ifeld tested in Yuanba Gas Field and was successful and effective, which increased the average penetration rate of 3rd opening in Yuanba Gas Field from 0.76 m/h to 2.06 m/h and shortened the drilling cycle from 150-170 d to 90-110 d. The shortening rate was 35%, which effectively solved the technical bottleneck of accelerating drilling rate in Yuanba Gas Field. Field application shows that NEW-DRILL can effectively increase the penetration rate in continental formations and can be further promoted and used.关键词
元坝气田/致密储层/钻井提速/高效PDC钻头/NEW-DRILL工具/机械钻速Key words
Yuanba Gas Field/tight reservoir/drilling speed/high-efifciency PDC bit/NEW-DRILL/rate of penetration分类
能源科技
