大陆科学深钻井下参数测试系统研究

RESEACH ON DOWNHOLE PARAMETER TESTING SYSTEM IN CONTINENTAL SCIENTIFIC DRILLING

胡郁乐 乌效鸣 王元汉 李云波

Hu Yule Wu Xiaoming Wang Yuanhan Li Yunbo

华中科技大学土木工程与力学学院, 湖北武汉 430074 中国地质大学, 湖北武汉 430074

Huazhong University of Science & Technology

大陆科学钻探是获取地球深部物质信息最直接的方法,是地球科学发展的基础,通过在大陆科学深钻井中的连续取心和测试,研究地球固体圈层的组成与结构、地下生物圈与水圈的演变过程。结合大陆科学钻探预研项目,对井下仪器设计的技术难点进行了研究,分析了科钻深井的井斜角、井内温度和压力等参数的测试环境和进行参数测试的重要性;运用随钻测量方法和井底贮存信息、地表回放的测试方案,完成了首轮仪器的原理设计、结构设计和电路软硬件设计,并制造了DPMA - 1型前期样机。现场试验表明,该井下测试系统能适应井底高温、高压、振动等恶劣条件,可获取钻井轨迹的连续参数。该仪器在检测井斜的同时,还可监视钻井液温度、压力的变化,由此判断井底机具的工况、钻井液循环时的沿程阻力等。由于实现了随钻检测,无需为测斜而停钻,大幅度地减少了辅助作业时间。

As the most direct method of obtaining the underground information from the earth, continental scientific drilling involves continuous coring and testing in the deep wells, so as to study the composition and structure of the earth, and the evolving process of underground bio-circle and water circle. Combined with the pre-research programs of China Continental Scientific Drilling (CCSD), this paper investigated the technical difficulties of designing the downhole instruments, and analyzed the testing circumstances of such parameters as hole inclination, temperature and pressure, etc., as well as the significance of conducting these testings. Using the method of Measuring While Drilling (MWD) and the testing means of storing the information in the down-hole and playing back on the surface, the primary designs such as its principle, structure and electric circuit have been finished; meanwhile the sample instrument named DPMA-1 has also been made. Field test indicated that this downhole testing systems can adapt such difficult conditions as high temperature, high pressure, vibration and obtain the continuous parameters of the drilling trajectory. DPMA-1 can also be used to monitor the changes in the temperature and pressure of drilling fluid, so as help to judge the working condition of the downhole motor, and drilling fluid circulation resistance, etc. Thus measurement while drilling can be realized and assistant operation time was cut down dramatically.

10.3969/j.issn.1000-7393.2004.03.003