长庆油田G0-7井组三维水平井钻井技术研究
发布时间：2019-05-18 07:58
【摘要】：长庆油田所处的鄂尔多斯盆地油气藏属于“三低”(低压、低渗、低丰度)油气藏,并有相当一部分属于致密油气藏,开发难度大,开发成本高,严重制约了油田增产目标,增大了油气开采成本。为此,长庆油田在勘探开发中进行了长庆特色的体积压裂“工厂化”大偏移距丛式三维水平井组作业模式的先导试验。研究三维水平井关键钻井技术对控制钻井成本,缩短鄂尔多斯盆地油气藏的开发周期具有重要实践意义。本文采用空间圆弧设计方法推导了三维水平井轨迹设计理论模型,以G0-7井组靖60-22H2井为例进行了井身剖面参数；在轨迹设计的基础上,推导了三维丛式水平井钻柱摩阻扭矩预测模型,结合靖60-22H2井设计轨迹、钻井参数和钻柱结构对靖60-22H2井二开和三开的钻柱摩阻扭矩进行了计算,根据摩阻扭矩计算结果校核了钻柱强度,以钻柱模拟扭矩最小为目标,优化了三维水平井钻柱结构,提出了降摩减阻工艺技术措施。本文采用弹性稳定理论,研究了弯外壳螺杆钻具在弯曲井眼内的受力和变形特性,推导了同一跨内有两种不同刚度的梁柱在不同外载作用下端部转角的变刚度计算模型,预测了弯外壳结构参数、钻井参数、井眼几何形状等对弯外壳螺杆钻具造斜率的影响,并采用现场实钻数据对理论预测结果进行了对比分析。研究结果表明,G0-7井组三维丛式水平井的造斜点500m,造斜率在0-6。/30m范围内变化,水平段长度1000m,扭方位254。,满足鄂尔多斯盆地“三低”油气藏高效开发的需要；通过钻柱摩阻扭矩分析,优选出水平井段的钻柱结构为；弯外壳螺杆钻具的结构弯角、井斜角、钻压对螺杆钻具的影响较大,随着构弯角、井斜角、钻压的增加,螺杆钻具造斜率增加；井眼扩大会降低螺杆钻具的造斜造斜能力。本文提出的三维水平井轨迹设计与轨迹控制、摩阻计算与降摩减阻措施等关键性钻井技术,除在G0-7井组钻井施工过程中成果应用外,还在苏东南致密气、宁定安83、西233和林镇区块等长庆油田多个三维水平井井组施工区域得到推广应用,现场施工效果良好。经过油田实践的检验和验证,表明所提出的三维水平井钻井工艺技术对气田的钻井技术有重要的指导意义。
[Abstract]:The Ordos Basin oil and gas reservoirs in Changqing Oilfield belong to "three low" (low pressure, low permeability, low abundance) oil and gas reservoirs, and a considerable part of them belong to tight oil and gas reservoirs, which is difficult to develop and has high development cost, which seriously restricts the goal of increasing oil production. The cost of oil and gas exploitation is increased. Therefore, the pilot test of large offset cluster three-dimensional horizontal well group operation mode with Changqing characteristics has been carried out in Changqing Oilfield. It is of great practical significance to study the key drilling technology of three-dimensional horizontal well to control drilling cost and shorten the development cycle of oil and gas reservoirs in Ordos Basin. In this paper, the theoretical model of 3D horizontal well trajectory design is derived by using spatial circular arc design method, and the wellbore profile parameters are carried out by taking Jing60-22H2 well group of G0X7 well group as an example. On the basis of trajectory design, the prediction model of friction torque of drill string in three-dimensional cluster horizontal well is deduced. Combined with the design trajectory of Jing60-22H2 well, drilling parameters and drill string structure, the friction torque of drill string in Jing60-22H2 well is calculated. According to the calculation results of friction torque, the strength of drill string is checked, and the drill string structure of three-dimensional horizontal well is optimized with the goal of minimizing the simulated torque of drill string, and the technical measures of reducing friction and drag are put forward. In this paper, the stress and deformation characteristics of curved shell screw drilling tool in curved wellbore are studied by using elastic stability theory, and the variable stiffness calculation model of end rotation angle of Liang Zhu with two different stiffness in the same span under different external loads is derived. The effects of curved shell structure parameters, drilling parameters and wellbore geometry on the slope of curved shell screw drilling tool are predicted, and the theoretical prediction results are compared and analyzed by using the field drilling data. The results show that the inclination point of the three-dimensional cluster horizontal well group is 500m, the slope is changed in the range of 0 鈮，
本文编号：2479815
[Abstract]:The Ordos Basin oil and gas reservoirs in Changqing Oilfield belong to "three low" (low pressure, low permeability, low abundance) oil and gas reservoirs, and a considerable part of them belong to tight oil and gas reservoirs, which is difficult to develop and has high development cost, which seriously restricts the goal of increasing oil production. The cost of oil and gas exploitation is increased. Therefore, the pilot test of large offset cluster three-dimensional horizontal well group operation mode with Changqing characteristics has been carried out in Changqing Oilfield. It is of great practical significance to study the key drilling technology of three-dimensional horizontal well to control drilling cost and shorten the development cycle of oil and gas reservoirs in Ordos Basin. In this paper, the theoretical model of 3D horizontal well trajectory design is derived by using spatial circular arc design method, and the wellbore profile parameters are carried out by taking Jing60-22H2 well group of G0X7 well group as an example. On the basis of trajectory design, the prediction model of friction torque of drill string in three-dimensional cluster horizontal well is deduced. Combined with the design trajectory of Jing60-22H2 well, drilling parameters and drill string structure, the friction torque of drill string in Jing60-22H2 well is calculated. According to the calculation results of friction torque, the strength of drill string is checked, and the drill string structure of three-dimensional horizontal well is optimized with the goal of minimizing the simulated torque of drill string, and the technical measures of reducing friction and drag are put forward. In this paper, the stress and deformation characteristics of curved shell screw drilling tool in curved wellbore are studied by using elastic stability theory, and the variable stiffness calculation model of end rotation angle of Liang Zhu with two different stiffness in the same span under different external loads is derived. The effects of curved shell structure parameters, drilling parameters and wellbore geometry on the slope of curved shell screw drilling tool are predicted, and the theoretical prediction results are compared and analyzed by using the field drilling data. The results show that the inclination point of the three-dimensional cluster horizontal well group is 500m, the slope is changed in the range of 0 鈮，
本文编号：2479815
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