川西须家河组水平井钻井现场优化研究

发布时间：2019-04-21 06:01

【摘要】：川西须家河组储层非均质性较强,泥页岩与砂岩互层频繁,导致机械钻速慢、钻井周期长,轨迹控制难度大、井眼阻卡复杂、井下复杂情况较多,并导致作业成本高,这些情况在水平井施工中更加突出。本文针对川西须家河致密气藏水平井钻井中出现的以上问题,开展了相应技术优化和试验,形成适合川西须家河水平井钻井的优化配套技术。本文总体上在充分调研国内外深井水平井钻井施工资料的基础上,结合国内外同类型井的井眼轨迹设计优选情况与井身结构优选情况,再结合川西现有须家河水平井施工现状分析,进一步优化须家河水平井井眼轨迹设计与井身结构设计,并开展现场试验。将须四水平井井身结构由四开制优化为三开制,简化了井身结构,缩小了井眼尺寸,技术套管减少一级,合理调整了技术套管下深,提高了钻井效率,较好地满足了川西深井水平井钻井需要。通过现场使用钻头情况,进行了PDC钻头和牙轮钻头优选,经过现场试验应用,形成了有利于川西须家河水平井定向钻井提速的钻头系列。同时,通过井眼轨道优化设计、水平井钻井参数优选、水平井着陆控制和水平井段控制技术,结合轨迹实时优化及控制,形成了川西须家河组致密气藏水平井井眼轨迹控制技术。开展典型导向钻具组合受力分析与底部钻具组合优化设计研究,在研究成果的基础上,进行现场试验。针对水平段定向效率问题,引进了旋转导向技术,并进行川西地区水平井钻井工程技术现场综合试验,形成川西水平井钻井配套技术。该技术在在新21-XH井和新21-XIH井进行了综合应用,取得了明显效果：试验井平均钻井周期比设计周期缩短22.27%,与非试验井相比钻井周期缩短率提高了14.92%；平均井下复杂情况与事故率为1.15%,比非试验井降低了1.24%。
[Abstract]:The reservoir heterogeneity of Xujiahe formation in western Sichuan is strong, and the interbed between shale and sandstone is frequent, which leads to slow drilling rate, long drilling cycle, difficult trajectory control, complex borehole obstruction, more complicated downhole conditions, and high operation cost. These conditions are more prominent in horizontal well operation. In view of the above problems in horizontal well drilling in Xujiahe tight gas reservoir in West Sichuan, this paper has carried out the corresponding technical optimization and test, and formed the optimized matching technology suitable for the horizontal well drilling in Xujiahe Gas Reservoir, West Sichuan. In this paper, on the basis of fully investigating the drilling data of deep well horizontal wells at home and abroad, combined with the optimization of wellbore trajectory design and wellbore structure optimization of the same type of wells at home and abroad, Combined with the analysis of the present situation of the horizontal well construction in Xujiahe horizontal well in West Sichuan, the well trajectory design and well structure design of the horizontal well in Xujiahe are further optimized, and the field test is carried out. The shaft structure of the four horizontal wells is optimized from four to three, which simplifies the well structure, reduces the borehole size, reduces the first grade of the technical casing, reasonably adjusts the depth of the technical casing, and improves the drilling efficiency. It can meet the needs of horizontal well drilling in West Sichuan deep well. The PDC bit and cone bit are optimized by using bit in the field. Through field test and application, a series of bit is formed which is beneficial to speed-up of directional drilling in Xujiahe horizontal well in West Sichuan. At the same time, through well trajectory optimization design, horizontal well drilling parameters optimization, horizontal well landing control and horizontal well section control technology, combined with real-time trajectory optimization and control, The horizontal well trajectory control technique of Xujiahe formation tight gas reservoir in west Sichuan is formed. The stress analysis of typical guide drill assembly and the optimization design of bottom drill assembly are carried out. Field tests are carried out on the basis of the research results. Aiming at the problem of directional efficiency in horizontal section, the rotary steering technology is introduced, and the comprehensive field test of horizontal well drilling engineering in western Sichuan is carried out to form the matching drilling technology of horizontal well in western Sichuan. The comprehensive application of this technique in new 21-XH well and Xin21-XIH well has achieved obvious results: the average drilling cycle of the test well is 22.27% shorter than the design cycle, and the shortening rate of drilling cycle is increased by 14.92% compared with the non-test well; The average downhole complexity and accident rate is 1.15%, which is 1.24% lower than that of non-test wells.
【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】：TE243

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