东海井身结构优化与钻井提速技术

Borehole Structure Optimization and Drilling Speed-up Technology in the East China Sea

谢中成 曹明辉 李乾 雷新超

XIE Zhongcheng CAO Minghui LI Qian LEI Xinchao

中石化海洋石油工程有限公司上海钻井分公司，上海　201206 中国石油化工股份有限公司上海海洋油气分公司石油工程技术研究院，上海　200120

SINOPEC Offshore Oilfield Services Company Shanghai Drilling Division, Shanghai, 201206 Offshore Petroleum Engineering Institute of SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai, 200120

为了节省东海油气田勘探开发成本、降低新建油气田经济开发门槛、提高机械钻速、实现钻井降本增效的目的，针对东海地层中12-1/4 in井段裸眼段长、夹层多、可钻性差、井壁容易失稳，导致起下钻困难、划眼时间长、井壁坍塌及卡钻等诸多钻井难题，进一步优化表层井眼尺寸，对深部井身结构简化，并创新引进了等壁厚马达、水力振荡螺杆、一体化复合提速工具等钻井提速工具，形成了配套提速技术。现场应用显示，2018年全井平均机械钻速较“十二五”末提高55%，深层提高72.2%，提速降本效果显著。研究成果有效保障了油气井低成本、安全、高效勘探开发，对边际油气田的开发、老油田挖潜以及探井降本具有广阔的应用前景。

In order to save the cost of exploration and development in oil and gas fields of the East China Sea, reduce the economic development threshold of new oil and gas fields, increase the rate of penetration (ROP), and achieve the purpose of cost reduction and efficiency increase in drilling, there are many drilling challenges in the 12-1/4 in borehole in the East China Sea, such as long open hole section, multiple inter-layers, poor drillability, and the borehole instability, which leads to difficulties in tripping, long reaming time, well-bore collapse and jamming of a drilling tool, etc.. The surface borehole size is further optimized, deep well structures are simplified, and motor with equal wall thickness, hydraulic oscillating screw, integrated compound speed-up tool and other drilling speed-increasing tools have been innovatively introduced in order to meet these challenges. Through the field application of the research results, the effect of cost reduction and efficiency increase is significant considering, the average ROP of the entire well in 2018 is 55% higher than the end of the 12th Five-year Plan, and the deep layer has increased by 72.2%. Application shows that this technology effectively guarantees the low-cost, safe and efficient exploration and development of oil and gas wells and it has a broad application prospects in the marginal field and old oilfields development as well as reduction of exploration well cost.

“十三五”国家重大科技专项“东海深层低渗-致密天然气钻井测试及储层改造关键技术”（2016ZX05027-003）

https://doi.org/10.3969/j.issn.1008-2336.2021.03.052