防硫堵漏随钻钻井液体系研究与应用

 井漏和硫化氢腐蚀是裂缝性异常低压酸性气田钻井作业过程遇到的两大难题。有针对性地研制了随钻堵漏钻井液体系LCM，开展了相应的室内实验并应用于现场。LCM体系由硫化氢清除剂、抑制剂、缓蚀剂和堵漏体系组成，该体系性能稳定，悬浮性良好、不沉淀，配伍性良好。将该体系应用于现场施工3口井，钻井作业过程中能够有效防硫，并在不影响钻井进程的情况下，对长达110m的井漏失返井段进行快速人工造壁，实现有效封堵。现场应用效果表明，该钻井液体系可有效防硫，同时随钻堵漏效果好，尾管固井顺利，不影响地质录井；在保证施工质量的同时，能节省作业时间和钻井液材料，缩短钻井周期，有效降低作业成本。

A Drilling Fluid System for Sulfide-controlling and Sealing While Drilling

The lost circulation and the sulfured hydrogen corrosion are two problems in drilling in a fractured abnormal low pressure acidic gas field. To deal with these problems, the drilling fluid system for the lost circulation while drilling-LCM is developed. The related laboratory experiments and field applications were carried out. The LCM system consists of the desulphurization agent, the inhibitor, the corrosion inhibitor and the plugging agent, and it is shown to be of stable performance, good suspension property and good compatibility. This system has been applied in three wells. The application in the field shows that it can inhibit the sulfide effectively without affecting the drilling speed in the process of drilling, and can successfully build a man-made sidewall to plug effectively for the lost circulation interval of 110m rapidly. It is shown that the LCM system can effectively inhibit the sulfide with good liner cementation and geologic logs. The system can also reduce the operation time and the drilling fluid amount, thus to reduce the operation cost and shorten the operation cycle, as well as ensure the operation quality.