分支井完井技术及增产措施效果评价

发布时间：2018-05-20 22:45

本文选题：分支井重入技术 + 膨胀管定位　；参考：《西南石油大学》2014年硕士论文

【摘要】：多分支井完井对各个分支段的隔离、控制以及井壁稳定技术日趋成熟,我国近几年在多分支井完井方面有很大进步,研制了具有自主知识产权的完井系统,但是,与国外先进的完井装置相比,大多是针对某一区块油气田设计的,缺乏普遍适用性,在工艺上很难大范围推广。我国在解决多分支井筒的隔离问题上与国外还存在差距,主要体现在完井井下装置智能程度不高、可控性差等方面。本文通过对国内外分支井完井系统及配套工具调研,从分支井完井技术,及增产措施效果评价方面入手,结合合川001-Z45井完井设计及施工,研究分支井的重入技术和膨胀管定位多分支井技术,并对合川001-Z45井增产改造措施进行效果评价,得出以下认识和结论： (1)分支井3-5级完井系统主要由下入定向和定位装置、开窗磨铣装置、侧钻导向系统、打捞回收装置、重进入导向装置、悬挂装置和不同完井方式配套工具组成。 (2)分支井叉口部位对水泥环承压能力要求较高,需要开发专用的窗口密封剂和特殊的水泥浆来提高其固井质量和水泥环强度。 (3)膨胀管定位方法能够提供更大井内通径,利于常规完井、增产、修井工具使用,因而具有较好适应性,但也存在一定风险。 (4)BAKER壁钩式悬挂系统不仅能提供分支井主、分支井眼分支点处的机械支撑,而且为分支井主、分支井眼提供重入通道,重入方式有多种,且风险较低。 (5)合川001-Z45分支井钻完井及增产过程中选择性重入技术：钻井过程中,分支井井眼重入采用斜向器重入系统；完井过程中,分支井井眼选择性重入采用新疆预开孔悬挂系统；增产作业过程中,分支井井眼选择性重入可采用弯接头；后期修井过程中,分支井井眼选择性重入采用探头导向重入系统。 (6)合川001-Z45分支井增产改造技术：针对合川须家河气藏储层纵向上层多、跨距大,采用分层压裂,压裂设计以“增加缝长、控制缝高、降低伤害、快速返排”为优化设计原则；须二上部施工压力高,可适当控制最高砂浓度以降低施工风险；考虑到分支井套管开窗处承压值低,施工时需控制套压；排液推荐采用“控制回压、逐级放大油嘴、强制闭合”方法,需防止支撑剂过度回流。
[Abstract]:The isolation, control and sidewall stabilization technology of multi-branch well completion have matured day by day. In recent years, China has made great progress in multi-branch well completion, and has developed a completion system with independent intellectual property rights. Compared with foreign advanced well completion devices, most of them are designed for a certain block of oil and gas fields, which lacks universal applicability and is difficult to be widely popularized in technology. There is still a gap between our country and foreign countries in solving the problem of multi-branch wellbore isolation, which is mainly reflected in the low intelligence degree and poor controllability of the completion downhole device. Based on the investigation of the completion system and supporting tools of the branch well at home and abroad, this paper starts with the evaluation of the completion technology of the branch well and the effect of the stimulation measures, and combines with the completion design and operation of Hechuan 001-Z45 well. This paper studies the reentry technology of branched well and the multi-branch well technology of expansion tube location, and evaluates the effect of the measures of increasing production and revamping of Hechuan 001-Z45 well, and obtains the following understanding and conclusion: Grade 3-5 completion system of branch well is mainly composed of down-entry orientation and positioning device, window milling device, sidetracking guide system, fishing recovery device, re-entry guide device, suspension device and supporting tools for different completion modes. (2) the forks of branch wells require high pressure bearing capacity of cement ring, so it is necessary to develop special window sealant and special cement slurry to improve cementing quality and cement ring strength. 3) the expansion tube positioning method can provide larger inner diameter of wells, which is beneficial to conventional completion, production increase and workover tools, so it has good adaptability, but there are also some risks. The hook suspension system can not only provide mechanical support at branch well main and branch hole branch point, but also provide reentry passage for branch well owner and branch hole. There are many ways of reentry, and the risk is low. In Hechuan 001-Z45 branch well drilling and completion and selective re-entry technology during the production increase process: during the drilling process, the branch hole re-entry system is used, the branch hole selective re-entry system is used in the completion process, and the Xinjiang pre-opening hole suspension system is used in the branch hole selective re-entry system. In the process of increasing production, the curved joint can be used in the selective re-entry of the branched borehole, and in the later workover, the probe guided reentry system is used in the selective re-entry of the branched well. (6) Hechuan 001-Z45 branch well stimulation and reconstruction technology: aiming at the high vertical upper layer and long span of Xujiahe gas reservoir in Hechuan, adopting stratified fracturing, fracturing design principle is "increase fracture length, control fracture height, reduce damage, and quickly reverse discharge" as the optimum design principle; The upper part should have high construction pressure, the highest sand concentration can be controlled appropriately to reduce the construction risk; considering the low pressure value of the casing opening in the branch well, the casing pressure should be controlled during construction; and the liquid discharge recommended "controlling the back pressure and amplifying the oil nozzle step by step," Forced closure method to prevent excessive backflow of proppant.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TE257

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