川西水平井高密度可固化前置液研究与应用

发布时间：2018-05-30 17:15

本文选题：固井 + 水平井　；参考：《西南石油大学》2015年硕士论文

【摘要】：水平井具有与油层接触面积大、井筒压差小、波动阻力小等的优点,已成为川西地区增产上产的主要井型,但其固井质量一直难以保障,直接影响了川西地区勘探开发推进。通过现场资料调研,分析了影响川西地区水平井固井质量的主要因素：①地质条件复杂,优质井眼质量、井眼轨迹难于获得；②井眼准备不充分,井下岩屑、泥饼及二者混裹物残留堆积,钻井液流变性差等,严重影响后续顶替作业与界面胶结性能；③钻井液体系与水泥浆化学相容性差；④防气窜水泥浆体系仍难以满足工作液掺混和界面泥饼的固化性能要求,上述因素影响主要体现在：造斜段、水平段滞留钻井液与水泥浆难以形成较高的固结强度,环空二界面胶结质量差。针对上面问题,本文以提高川西地区水平井固井质量为目的,从减小顶替效率对固井质量的影响和提高混浆、二界面泥饼固化胶结能力两个方面入手,研究了可固化前置液技术,以解决川西水平井固井质量问题。可固化前置液是基于传统前置液和可固化工作液技术发展而来的固井新技术。该技术通过在传统前置液体系中加入具有潜在固化特性的固化材料,配合激活剂、调凝剂、分散剂等外加剂、外掺料,使其在具备隔离抗污染作用的前提下,同时具有较强的综合固化能力。研究中采用GYW可固化前置液体系,针对川西地区水平井固井技术实际情况进行研究,考察了其流动能力、稠化特性、化学相容和固化性能。实验结果表明：①GYW可固化前置液体系具有宽泛可调的密度、温度与压力范围；②通过控制激活剂、调凝剂和分散剂加量,使可固化前置液具有安全、可调的稠化特性,且流动能力、化学相容性能够满足施工安全要求；③可固化前置液自身固化快,强度高且长期稳定,混浆、界面泥饼辅助固化能力强,有助于提高掺混后水泥环的固结强度,增强二界面胶结性能。本研究通过现场实验,制订了符合川西地区水平井固井作业要求的可固化前置液体系应用技术,选取川西地区高庙XXX井和江沙XXX井两口水平井作为试验井进行了现场实践并取得成功。测井结果显示：两口试验井造斜段、水平段水泥环固结质量和层间封隔质量大幅提高。本文从室内研究和现场实践两个方面论证了GYW可固化前置液技术在川西地区水平井固井中的应用可行性和技术可靠性,为提高川西地区水平井固井质量技术研究提供了充足的理论分析基础,积累了宝贵的技术实践经验。
[Abstract]:Horizontal well has the advantages of large contact area with reservoir, small wellbore pressure difference and low fluctuation resistance, which has become the main well type in west Sichuan area, but its cementing quality has been difficult to guarantee, which directly affects the exploration and development in western Sichuan. Based on field investigation and investigation, the main factors affecting cementing quality of horizontal wells in West Sichuan are analyzed, such as complex geological conditions, high quality borehole quality, poor borehole preparation and low hole cuttings. The residue accumulation of mud cake and its mixture, the poor rheological property of drilling fluid, etc., seriously affect the subsequent displacement operation and the cementation performance of interface. 3. The chemical compatibility of drilling fluid system and cement slurry is poor. (4) the anti-gas channeling cement slurry system is still difficult to meet the requirements of the working fluid mixing and the solidification performance of the interfacial mud cake. The above factors are mainly reflected in the following factors: the diagonal section, the high consolidation strength between the horizontal residual drilling fluid and the cement slurry is difficult to be formed. The cementation quality of annulus two interface is poor. Aiming at the above problems, aiming at improving the cementing quality of horizontal wells in West Sichuan, this paper starts with two aspects: reducing the influence of displacement efficiency on cementing quality, improving slurry mixing and solidifying cementing ability of two-interface mud cake. In order to solve the cementing quality problem of horizontal wells in western Sichuan, the solidifiable preliquid technology is studied. The solidifiable presolution is a new cementing technology based on the traditional presolution and the curable working fluid technology. In this technology, additives such as activator, coagulant, dispersant and so on are added to the traditional pre-liquid system with potential curing properties, so as to make it have the premise of isolating and anti-pollution. At the same time, it has strong comprehensive curing ability. In this study, GYW solidifiable preliquid system was used to study the actual conditions of horizontal well cementing technology in western Sichuan, and its flow capacity, thickening property, chemical compatibility and solidification performance were investigated. The experimental results show that the precuring liquid system of 1: 1GYW has a wide and adjustable density. By controlling the amount of activator, coagulant and dispersant, the solidifiable preliquid has a safe and adjustable thickening property, and the temperature and pressure range can be adjusted by controlling the dosage of activator, coagulant and dispersant. The flow capacity and chemical compatibility can meet the requirements of construction safety, such as fast solidification, high strength and long-term stability, strong solidification ability of slurry and interface mud cake, which is helpful to improve the consolidation strength of cement ring after mixing. Enhanced two interface cementing performance. Based on the field experiments, the application technology of solidifiable liquid system for horizontal well cementing in western Sichuan has been developed. Two horizontal wells, Gaomiao XXX well and Jiangsha XXX well, are selected as experimental wells in western Sichuan. The logging results show that the cement ring consolidation quality and the interlayer sealing quality of the horizontal section are greatly improved in two test wells. In this paper, the feasibility and technical reliability of the application of GYW solidifiable preliquid technology in horizontal well cementing in western Sichuan are demonstrated from two aspects of laboratory research and field practice. It provides a sufficient theoretical analysis basis for improving the cementing quality of horizontal wells in western Sichuan and accumulates valuable technical practical experience.
【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

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