液力冲击提速工具在东海油气田的应用

Application of Effective Hydraulic Impact Drilling Tool for Deep Drilling in East China Sea Oil and Gas Field

摘要:

东海油气田是我国海上当前勘探开发的主要区域之一，该油田主要储层埋藏较深，钻井过程揭开多套地层，深部地层岩石抗压强度达到了100 MPa以上，可钻性差、地层温度较高。钻井过程中面临井壁失稳、机械钻速低、轨迹难以控制等诸多问题。针对上述问题，通过对国内外相关提速技术的调研，优选液力冲击工具开展东海深部地层的钻井提速研究与实践。该工具结构简单、可靠性较高，通过加放位置分析、操作参数优选，使现有钻井设备与工艺参数基本不改变，而创新性地提出了旋转导向与液力冲击工具配合，最终在X4H井的应用中机械钻速提高30%～200%，效果显著。

Abstract:

The East China Sea oil and gas field is currently one of the main offshore exploration and development areas in China, where the main reservoirs are deeply buried, the compressive strength of deep strata is above 100MPa with the conditions of poor drillability and high formation temperature. There are problems of wellbore instability, low ROP, difficult trajectory control and some others in drilling process. In view of the above, through the investigation of the related efficiency raising technologies both in China and abroad, the research and practice of effective drilling in the deep formation of East China Sea are carried out and hydraulic impact tool is selected, which has the advantages of simple structure and high reliability. By the analysis on the installing location and the optimization of operation parameter, the existing drilling equipment and technological parameters are kept original, while the innovative coordination of rotary steering and hydraulic impact tool is put forward, in the application of wellX4H, the ROP is significantly improved by 30%～200%.