塔里木油田气体钻井工艺及现场试验

发布时间：2018-10-12 20:32

【摘要】：气体钻井技术是利用气体作为循环介质将岩屑携带出井的一种钻井方式,是提高深层钻速、防止井漏、保护储层最为有效的技术手段。随着“新疆大庆”建设的开展,对钻井提速的需求日益迫切,本项目针对塔里木钻井地质难点,开展了空气钻井技术在塔里木油田的应用研究。本文开展了塔里木盆地空气钻井适应性评价,完成了底层岩性、地层压力、底层流体产出预测,提出空气钻井技术方案。博孜102井三开后采用空气钻井,取得以下成果:(1)2502~2602m井段存在渗透性水层和泥质含量较高的层段,该井段掉块卡钻风险较大,同时井壁也存在力学失稳,井眼椭圆特征十分明显,主要在最小主应力方向垮塌掉块。(2)配套了400m3、25MPa注气配套装备,能大幅度提高“深井、大井眼”井筒净化和处理复杂的能力。(3)牙轮钻头+预弯短节+双扶钻具组合、钻压小于1吨、转速55rpm,是目前砾石层空气钻井有效控制井斜的钻具组合和钻井参数。(4)连续循环系统实现了起下钻条件下的连续循环,能效降低起下钻过程中的风险,测斜仪能顺利通过连续循环短节,测斜时避免了起钻,提高了时效。
[Abstract]:Gas drilling technology is a kind of drilling method which uses gas as a circulating medium to carry cuttings out of wells. It is the most effective technical means to improve the deep drilling speed, prevent well leakage and protect reservoir. With the development of "Daqing" construction in Xinjiang, the demand for increasing drilling speed is becoming more and more urgent. Aiming at the geological difficulties of Tarim drilling, the application of air drilling technology in Tarim Oilfield has been studied. In this paper, the adaptability evaluation of air drilling in Tarim Basin has been carried out, and the prediction of bottom lithology, formation pressure and bottom fluid output has been completed, and the technical scheme of air drilling has been put forward. The results of air drilling after the opening of Bozi 102 well are as follows: (1) there are permeable water layers and layers with high muddy content in well section 2502N 2602m, and the risk of block blocking in this section is high, at the same time, there is also mechanical instability in the wellbore, and the elliptical characteristics of borehole are very obvious. It mainly collapses in the direction of minimum principal stress. (2) it is equipped with 400m ~ 3m ~ (25) MPA gas injection matching equipment, which can greatly improve the capability of "deep well, big hole" wellbore cleaning and processing complex. (3) the combination of pre-bent and short joint double-supported drilling tools of cone bit, the drilling pressure is less than 1 ton, The rotational speed of 55rpm is the drilling tool combination and drilling parameter for effectively controlling well deviation in air drilling in gravel formation at present. (4) the continuous circulation system realizes the continuous circulation under the condition of starting and drilling, and reduces the risk of energy efficiency in the process of drilling. The inclinometer can pass through the continuous cycle section smoothly, avoid drilling and improve the time-effect when measuring the slope.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE24

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