提高川西地区水平井固井质量技术措施实验研究

发布时间：2018-06-07 20:41

本文选题：水平井 + 固井　；参考：《西南石油大学》2015年硕士论文

【摘要】：水平井技术成为川西地区增储上产的重要手段,但由于该地区地质条件复杂,地层不稳定,钻井过程中易形成岩屑床,同时还存在钻井液固相含量大,泥饼虚厚,前期循环不充分等问题使井眼难以清洁,影响了该地区水平井固井质量。本论文针对该地区固井目前存在岩屑床和黏附泥饼清洁困难的问题,提出了使用纤维冲洗液、旋流扶正器两项措施解决这些问题,并通过室内模拟试验,研究其对泥饼冲洗和岩屑床清除的效果。利用高温高压前置液动态冲洗效率实验装置研究不同浓度纤维冲洗液和冲洗速度对泥饼冲洗效率的影响,泥饼冲洗效率随纤维浓度、冲洗速度增加而增大。同时,利用顶替效率模拟装置研究不同纤维浓度、排量、偏心度和黏度对岩屑床清除的影响：岩屑床清除效率与环空排量成正比,与套管偏心度成反比、与冲洗液黏度成正比。通过上述实验确定了纤维最佳浓度范围。利用顶替效率模拟装置对比分析了不同排量和偏心度时,常规扶正器与旋流扶正器清除岩屑的效果,相同实验条件时,旋流扶正器的岩屑清除效率明显高于常规扶正器；同时,岩屑床清除效率与旋流扶正器和岩屑床之间的距离成反比。利用离子图像测速(PIV)仪对比分析了环空无旋流场与旋流流场,水平环空窄间隙无旋流场轴向速度分布与旋流流场分布相似,窄间隙中间区域流速高,近套管与近井壁处流速小,且近井壁处最小。环空旋流流场的轴向速度小于无旋流场；环空无旋流场轴向速度沿环空间隙中心线对称,而环空旋流流场轴向速度峰点偏向井壁,且其切向分速度沿轴向衰减。以新沙X井为例,设计并优选了该井固井冲洗液施工方案,以及旋流扶正器安放间距。
[Abstract]:Horizontal well technology has become an important means of increasing reservoir production in western Sichuan. However, because of the complex geological conditions and unstable formation in this area, cuttings bed is easy to be formed during drilling. At the same time, there are also large solid content of drilling fluid and virtual thickness of mud cake. It is difficult to clean the borehole due to insufficient circulation in the early stage, which affects the cementing quality of horizontal well in this area. In this paper, aiming at the problem of hard cleaning of cuttings bed and adhesive cake in cementing in this area, two measures are put forward to solve these problems, which are fiber flushing fluid and swirl centralizer, and these problems are solved by laboratory simulation test. The effect of mud cake washing and debris bed cleaning was studied. The effects of different concentration of fiber flushing fluid and flushing speed on the mud cake washing efficiency were studied by using the dynamic washing efficiency experimental device of high temperature and high pressure presolution. The mud cake washing efficiency was dependent on the fiber concentration. The washing speed increases with the increase of the washing speed. At the same time, the effects of fiber concentration, displacement, eccentricity and viscosity on the removal of cuttings bed are studied by means of displacement efficiency simulator. The removal efficiency of cuttings bed is directly proportional to annular discharge, inversely proportional to casing eccentricity, and directly proportional to flushing fluid viscosity. Through the above experiments, the optimum concentration range of fiber is determined. The effects of conventional centralizer and swirl centralizer on the removal of cuttings with different displacement and eccentricity are compared and analyzed by using displacement efficiency simulator, when the experimental conditions are the same, The debris removal efficiency of swirl centralizer is obviously higher than that of conventional centralizer. The removal efficiency of the cuttings bed is inversely proportional to the distance between the swirl centralizer and the cuttings bed. The annulus free flow field and the swirl flow field are compared and analyzed by ion image velocimetry (PIV) instrument. The axial velocity distribution of the narrow gap in horizontal annulus is similar to that of the swirl flow field. The velocity in the middle area of narrow gap is high, the velocity near casing and near shaft wall is small, and the velocity near shaft wall is the smallest. The axial velocity of annulus swirl flow field is smaller than that of non-swirl flow field, the axial velocity of annulus swirl flow field is symmetrical along the center line of annulus clearance, while the axial velocity peak point of annulus swirl flow field is inclined to well wall. And its tangential velocity attenuates along the axial direction. Taking Xinsha X well as an example, the construction scheme of cementing fluid and the spacing of cyclone centralizer are designed and optimized.
【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】：TE256

【参考文献】