国产自动垂直钻井系统的改进与优化

高陡构造及岩性变化复杂条件下的井斜问题一直是困绕钻井工作者的一大技术难题。中国石化南方探区河坝、普光等构造的岩性变化频繁,地层倾角大,自然造斜力强,井斜控制十分困难,极易发生井斜,严重制约了钻井速度的提高。国外自动垂直钻井系统在该地区进行了多井次的应用,效果良好,在控制井斜的同时大幅度提高了钻井速度,较好地解决了钻速提高与井斜控制之间的矛盾。但国外自动垂直钻井系统服务价格昂贵,钻井成本居高不下。为了降低钻井成本,决定在该地区应用中国石化自主研发的捷联式自动垂直钻井系统。然而,该系统在之前的现场试验过程中暴露出降斜、提速效果不明显等问题;经过原因分析,对系统进行了进一步的改进与优化,之后又进行了2井次的现场试验,显示出非常好的防斜打快效果,为系统的推广应用打下了坚实的基础。

Improvement and optimization on home-made automatic vertical drilling system

Borehole deviation problem under the complex conditions of high-steep structure and lithnlogieal change has been a major technical problem that troubles drilling engineers. In the southern exploration areas of Sinopec, such as Heba and Puguang structure, lithology changes frequently, and stratigraphic dip is large, with a strong natural deviation force. So well deviation contrnlling is extremely difficult, which leads to a very low drilling speed. Foreign automatic vertical drilling systems have been used for many times in the area, with a good effect. Drilling speed has been greatly improved when well deviation is controlled, which resolves the contradiction between drilling speed improvement and well deviation controlling. However, due to the expensive service fee of foreign automatic vertical drilling systems, the cost of drilling stayed high. In order to reduce the drilling cost, Sinopec has independently developed the strap-down automatic vertical drilling system. Before that, the system was tested in northeastern Sichuan Area and some problems were revealed. Then the system is improved and is optimized fnrther in view of the problems presented in field test. After that, field test of two well times is conducted and a good effect is gotten, laying a solid foundation for the mature application of tool.