加压泥浆帽控压钻井关键作业参数计算方法

发布时间：2018-02-13 20:26

本文关键词： 加压泥浆帽计算方法作业参数泥浆帽用量反挤钻井液次数　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：加压泥浆帽控压钻井技术是针对高压裂缝或含硫复杂储层钻井恶性漏失提出的一种钻井技术解决方案,加压泥浆帽控压钻井关键作业参数计算是加压泥浆帽控压钻井实施的关键技术问题。加压泥浆帽控压钻井关键作业参数包括气侵速度、总泥浆帽用量、反挤钻井液次和泥浆帽性能等参数,这些参数是影响加压泥浆帽控压钻井施工安全和作业成本的主要因素,国外至今也未形成一套完整的加压泥浆帽控压钻井关键作业参数理论计算方法。本文作为国家油气重大科技攻关项目21课题6(合同编号：2011ZX05021-006)研究内容之一,对加压泥浆帽控压钻井关键作业参数计算方法进行了研究。本文开展了加压泥浆帽控压钻井关键作业参数计算,加压泥浆帽控压钻井气侵速度计算和泥浆帽性能设计等理论方法研究。基于多相流理论建立了加压泥浆帽控压钻井关键作业参数的计算模型,采用有限差分方法对模型进行了求解,提出了一套加压泥浆帽控压钻井关键作业参数计算方法；关键作业参数计算方法需要实际的气侵速度,因此又提出了一套基于现场试验的气侵速度计算方法,其中包括地层适应性、套压变化等钻前现场试验和基于套压变化的气侵速度计算；本文还根据反挤钻井液阶段的最高井口套压提出了泥浆帽性能设计方法。根据本文提出的加压泥浆帽控压钻井关键作业参数计算方法,利用Visual Studio2010平台开发了加压泥浆帽控压钻井关键作业参数计算软件。使用开发的软件对超深井、深井和浅井进行了加压泥浆帽控压钻井关键作业参数计算,得到了关键作业参数的变化规律：a)随施工套压增大,总泥浆帽用量呈现出先快速增加后趋于平缓的变化规律；b)随施工套压增大,反挤钻井液次数呈现出非线性减少的变化规律；c)不同井深和气侵速度条件下的总泥浆帽用量、反挤钻井液次数都呈现出相似的规律；d)气侵速度越大、井越深,总泥浆帽用量越大。经实践表明,通过本文的气侵速度计算方法就能得到实际的气侵速度,利用加压泥浆帽控压钻井关键作业参数计算方法能够计算出不同施工套压条件下的总泥浆帽用量、反挤钻井液次数和泥浆帽性能参数,为加压泥浆帽控压钻井的实施提供了理论计算方法。开发的加压泥浆帽控压钻井关键作业参数计算软件,解决了手工计算难以实现的多相流计算问题,为加压泥浆帽控压钻井的实施提供了技术手段。
[Abstract]:Pressurized mud cap pressure control drilling technology for high pressure fractured or sulfur complex reservoir drilling leakage drilling technology a proposed solution, pressure controlled pressure drilling mud cap key operation parameters is the key technical problems of pressurized mud cap pressure control drilling mud cap. The implementation of pressure controlled pressure drilling key operation parameters including gas invasion rate, the total amount of mud cap, anti extrusion and mud cap drilling fluid performance parameters, these parameters are the main factors affecting the pressure controlled mud cap drilling construction safety and operating costs, foreign has not formed a complete pressurized mud cap pressure control drilling key operation parameters as the theoretical calculation method. Oil and gas project 21 project 6 (contract number: 2011ZX05021-006) one of the research contents, calculation method of pressure controlled pressure drilling mud cap key operation parameters were studied.
This paper carried out the pressure controlled pressure drilling mud cap key operation parameters of gas pressure control drilling mud cap performance speed calculation and design theory method of pressurized mud cap. The theory of multiphase flow calculation model is established for pressurized mud cap pressure control drilling key operation parameters based on the finite difference method is used to solve the model and put forward a set of pressure controlled pressure drilling mud cap key operation parameters calculation method; calculation of gas influx velocity method requires actual key operation parameters, and gives a method of calculating gas velocity based on field tests, including formation adaptability, casing pressure changes before drilling field test and calculation of casing pressure changes gas velocity based on; according to the anti extrusion drilling fluid phase maximum wellhead pressure design method is proposed. The performance of mud cap
According to the calculation method of pressurized mud cap the MPD key operation parameters, using the Visual Studio2010 platform for pressurized mud cap pressure control drilling key operation parameters calculation software development. With the development of the software for ultra deep well, deep and shallow wells pressure controlled pressure drilling mud cap key operation parameters, variation of the key operation parameters: a) with the construction set pressure increases, the total amount of mud cap showed increased rapidly and then slowly changes; b) with the construction set pressure increases, the number of anti extrusion drilling fluid shows nonlinear reduction changes little; c) of different depth and penetration speed under the condition of general mud cap the amount of drilling fluid, the anti extrusion times presented the similar regularity; d) gas velocity increasing, the deeper the well, the more the amount of the total mud cap.
The practice shows that the gas velocity through the gas velocity calculation method can get the actual use, calculation method of key operation parameters of pressure controlled pressure drilling mud cap can calculate casing pressure under the condition of different construction total mud cap amount, anti extrusion times and mud cap drilling fluid performance parameters, provides a theoretical calculation method for pressurized mud cap control pressure drilling. The development of pressurized mud cap pressure control drilling key operation parameters calculation software, and solve the difficult realization of manual calculation of multiphase flow calculation, for the pressure control pressure drilling mud cap provided technical means.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE24

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