Design and Application of a Hydraulic Rotary Sidewall Coring Tool at High Temperatures
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摘要:
为解决勘探井获取深地层岩心困难的问题，研制了一种最高工作温度达205 ℃、具有高可靠性的液压旋转井壁取心仪。该取心仪由地面系统、控制采集短节和机械液压节组成，并采用一体式保温瓶技术、被动式热管理技术和解卡技术，提高了取心仪的耐温性和工程安全性。通过模拟仿真和地面测试，验证了这些关键技术的功能。现场试验结果表明，该取心仪可在189 ℃高温高压环境、钻井液相对密度和地层压差较大的探井正常作业，平均岩心收获率大于90%，且具有耐高温、防压差卡钻、取心时效和岩心收获率高的特点，尤其是对存在扩径、缩径和井壁垮塌等问题的井段具有良好的适应能力和较高的安全可靠性。
Abstract:Since it is difficult to obtain stratigraphic cores in deep exploration wells, a hydraulic rotary sidewall coring tool with a maximum operating temperature of 205 °C and high reliability was developed. The coring tool is composed of a ground system, a control acquisition short section, and a mechanical hydraulic section, and adopts an integrated thermos bottle technology, passive thermal management technology, and stuck-freeing technology, which effectively improve its temperature resistance and engineering safety. The performance of these key technical functions was verified through simulation and ground tests. The actual operation results show that the tool can operate normally in exploratory wells with a high temperature of 189 °C and high pressure, high relative density of drilling fluid, and large formation pressure difference, and further, the average core recovery rate exceeds 90%. In addition, it has the characteristics of high temperature resistance, stick and jam prevention, and high coring efficiency and core recovery rate and shows excellent adaptability and high safety and reliability in solving problems in complex well sections, such as hole enlargement, hole contraction, and borehole collapse.
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图 7 热管理系统中热源及储热模块布置
Figure 7. Heat source and heat storage module arrangement in thermal management system
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图 10 MRCT-HT电路热仿真温度云图
Figure 10. Temperature cloud diagram of thermal simulation of MRCT-HT circuit
表 1 2MRCT-HT作业统计
Table 1 Operation statistics of 2MRCT-HT
井号 深度/m 井温/℃ 钻井液相对密度 取心数 岩心收获率，% 计划 实际 YC23-1-1 4 437 174 2.25 16 14 87 BD21-1-3d 5 115 160 1.42 43 43 100 DF13-3-1 2 916 134 2.04 47 43 91 WC8-3N-2d 3 850 132 1.37 33 33 100 WC16-2-2 4 612 160 1.36 50 47 94 HZ21-8-2 4 786 176 1.62 50 50 100 PY25-2-3 5 026 162 1.73 18 18 100 BD29-1-2D 5 055 189 1.63 82（2次） 82（2次） 100 
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