东海水平分支井悬空侧钻技术

Open-hole Sidetracking Technology in Horizontal Multilateral Wells in East China Sea

赵志付 孙乾坤 段宾

ZHAO Zhifu SUN Qiankun DUAN Bin

中海油能源发展股份有限公司上海工程技术分公司, 上海 200335

CNOOC EnerTech-Shanghai Drilling & Producing Branch, Shanghai 200335, China

随着油藏开发要求的不断提高，单靠增加水平段长度难以有效地提高油藏动用程度和单井产量，多分支水平井具有增加油藏泄油面积、提高单井产量、节约钻井费用等优点，是高效开发油气藏的理想井型。但是水平分支井侧钻存在失败以及虽然侧钻成功但作业时间过长的情况，海洋钻井作业高成本的矛盾十分突出。此文总结了东海使用旋转导向工具侧钻水平分支井的措施，结合东海水平分支井侧钻实践，总结了成功进行水平分支井作业的关键在于按照合理的施工程序操作，并在预定侧钻位置提前造大狗腿斜坡，有利于侧钻时更容易形成新井眼，提高悬空侧钻成功率。

With the continuous increase of requirements in the reservoir production, it is difficult to effectively improve the producing degree of reservoirs and enhance the single well production only by increasing the length of horizontal well. The horizontal multilateral well which can increase the drainage area of reservoirs, improve the single well production, save drilling cost is considered to be the ideal well type for the efficient development of oil and gas reservoirs. However, there exists the possibility of sidetracking failure or overlong operation time spent even though the operation being successful, which is very contradictory to the high cost of offshore drilling operation. This paper summarizes the measures taken in the horizontal multilateral well by rotary steering tool in the East China Sea. Combined with the sidetracking practice, it is concluded that the key point for the successful operation of a horizontal multilateral well is that the operation should be conducted under the reasonable construction procedure, big dogleg slope be made ahead of the predetermined sidetracking point, which makes the new hole easier when sidetracking and improves the success rate of open-hole sidetracking.

https://doi.org/10.3969/j.issn.1008-2336.2018.03.056