南海西江大位移井定向控制技术研究

STUDY ON DIRECTIOANL CONTROL TECHNOLOGY FOR XIJIANG EXTENDED-REACH WELLS IN SOUTH CHINA SEA

高德利 狄勤丰 张武辇

Gao Deli Di Q infeng Zhang Wunian

石油大学油气井工程研究所, 北京 102249 上海大学力学系, 上海 200072 中国海洋石油深圳分公司, 深圳 518067

对南海西江大位移井的定向控制技术进行了分析研究。在南海西江大位移井定向钻进控制中,综合使用了滑动导向马达及旋转导向工具2种钻井系统。当使用滑动导向马达时,虽然可实现水平位移超过8km的大位移井导向钻进目标,但施工难度较大,要求必须通过数值模拟来精心设计底部钻具组合;当使用旋转导向工具时,则可顺利实现大位移井的自动导向控制,并且可获得较高的控制质量。综合考虑技术与经济两方面因素,在钻进大位移井的小位移井段时,可使用滑动导向马达通过复合钻进实现井眼轨迹的连续导向控制,而在钻进较大位移井段时,则宜使用旋转导向工具进行自动旋转导向控制钻进。应根据井况对大位移井定向钻进进行变换控制。

Great advantages have been made by the Extended-Reach Wells (ERW) in Xijiang Oilfield in South China Sea. The directional drilling technology used in these ERWs has very important reference value. An intensive research has been made into the well trajectory control technology. The results show that it’s virtually a combination of the steering technologies of modulated or non-modulated slid-steering BHA and of rotary steerable system. An ERW with displacement of beyond 8 km can be drilled with the slide-steering BHA, but of great difficulty. A simulation should be made and the borehole enlargement should be taken into account to make a reasonable design of BHA. The steerable rotary system can be used to control the wellbore trajectory accurately, however it is determined by the technical and economic factors, that the slide-steering technology should be used when the horizontal displacement is smaller and the rotary steering technology should be used when the displacement is larger.

10.3969/j.issn.1000-7393.2004.02.001