分级固井注水泥工艺技术研究

发布时间：2018-04-02 05:04

本文选题：分级注水泥　切入点：分级箍位置　出处：《重庆科技学院》2015年硕士论文

【摘要】：分级固井注水泥工艺技术常用于解决水泥封固段长、地层压力系数低、固井过程井漏现象严重等问题。随着复杂井数量的增多，固井难度不断增大，固井现场还将分级固井技术与其他工艺技术相结合，来解决非常规油气井的水平井固井难题。本文在充分调研国内外相关文献及现场固井施工资料的基础上，对分级固井注水泥技术从固井工具、工艺流程、参数计算、技术应用等方面进行系统分析。综合考虑水泥浆流动压力、失重、井斜、储层特性、地层孔隙压力及地层破裂压力等因素，对平衡固井关系式进行修正，推导分级箍安放位置的计算公式。基于旋转粘度计原理进行水泥浆混合的实验，建立了低混合能量的计算模型，并通过分析得出，提高混合能量能改善低剪切速率流动下水泥浆的流变性能。考虑到储层特性因素，分析提出在确保压稳地层的前提下，尽量减小平衡固井关系式中的附加压差取值。计算分析了延488井分级注水泥的分级箍安装位置，对扶正器位置及注水泥流动过程的压力变化进行预测，表明了分级箍位置取值范围的合理性。对分级固井注水泥工艺技术应用于复杂地层固井进行研究，，得到：分级箍位置的确定不能仅采用常规方法，环空间隙、附加压差取值及井内流体性能参数等对分级箍位置的确定有较大影响。应用本文研究对延488井、延491井的分级注水泥进行计算分析，结果表明：环空间隙越小，要求分级箍安放位置越低，分级箍取值范围越窄；附加压差越大，要求分级箍安放位置越低。对华蒲5-39水平井的分级注水泥进行计算分析，分级箍合理的安放位置为井深785m处；本井低压低渗储层的附加压差可取较低值。本文研究对分级固井注水泥技术进行了补充与完善，有利于将该技术应用于复杂压力地层固井，推广应用于非常规油气水平井的固井作业。
[Abstract]:Grading cementing technology is often used to solve the problems of long cementing section low formation pressure coefficient and serious well leakage during cementing.With the increase of the number of complex wells, the cementing difficulty is increasing. In order to solve the problem of horizontal well cementing in unconventional oil and gas wells, the staged cementing technology is combined with other technology in cementing field.Based on the investigation of domestic and foreign literatures and field cementing construction data, this paper makes a systematic analysis of graded cementing technology in terms of cementing tools, process flow, parameter calculation and technical application.Considering the factors such as slurry flow pressure, weight loss, well deviation, reservoir characteristics, formation pore pressure and formation fracture pressure, the formula of equilibrium cementing relationship is revised and the formula for calculating the placement of graded hoop is deduced.Based on the principle of rotary viscometer, the calculation model of low mixing energy is established, and the rheological properties of cement slurry under low shear rate flow can be improved by increasing mixing energy.Taking account of the reservoir characteristics, it is proposed to minimize the additional pressure difference in the equilibrium cementing relationship on the premise of ensuring stable formation pressure.The installation position of graded hoop in Yan488 well is calculated and analyzed, and the pressure variation of centralizer and cement flow process is predicted, which indicates the rationality of the range of graded hoop position.The cementing technology of graded cementing is applied to the cementing of complex formation. It is concluded that the location of the graded hoop can not be determined by conventional method, and the annular clearance,The additional pressure difference and the fluid performance parameters in the well have great influence on the determination of the staging hoop position.The calculation and analysis of graded cement injection in Yan488 well and Yan491 well are carried out in this paper. The results show that the smaller the annulus gap, the lower the position of staging hoop, the narrower the range of graded hoop, and the greater the additional pressure difference.The lower the position of the staging hoop is required.Based on the calculation and analysis of graded cement injection in Huapu 5-39 horizontal well, the reasonable position of staging hoop is 785 m deep, and the additional pressure difference of low pressure and low permeability reservoir in this well may be lower.In this paper, the cementing technology of graded cementing is supplemented and perfected, which is beneficial to the application of this technology to cementing in complex pressure formations and to the cementing of unconventional horizontal oil and gas wells.
【学位授予单位】：重庆科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE256.5

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