浅层易漏井低密度水泥浆研究

发布时间：2018-06-02 23:24

本文选题：易漏井 + 低密度水泥浆　；参考：《东北石油大学》2017年硕士论文

【摘要】：低密度水泥浆体系一般指密度小于1.75g/cm3的水泥浆体系,由油井水泥、油井水泥减轻剂、水泥外加剂以及一定量水所构成的混合体,低密度水泥浆在易漏井、煤层气井、长封井固井施工中的广泛应用。对于浅层易漏井、煤层气井固井来说,由于井下温度低,低密度水泥浆中弱胶凝物质较多,导致水泥水化速度慢、强度低;同时,低温下与低密度水泥浆配套的外加剂较少,严重影响低密度水泥浆应用效果。本文围绕着低密度水泥浆外掺料颗粒级配及优选、低温下早强技术及稳定性控制、外加剂配伍性三个核心技术开展攻关。优选出承压能力好,性能良好的高强微珠,满足低密度设计要求。优选出性能良好的微硅,保证低密度水泥浆具有良好的稳定性,同时防止低密度水泥浆强度衰减。优选出性能良好的超细胶凝材料代替部分油井水泥,提高低密度水泥浆体系综合性能。利用颗粒级配技术,确定了水泥浆各组分的理论配比。通过实验研究,确定了不同密度水泥浆体系各组分实际配比。针对低温低密度水泥浆体系外掺料多,水泥水化速度慢的特点,研选出低温早强剂。利用聚合物包裹、偶联化原理,研选出悬浮稳定剂。从滤失量和低温不缓凝角度出发,确定不同类型降失水剂对低温低密度水泥浆性能的影响。通过流变性能、沉降稳定性、失水量、抗压强度等多方面的研究,对低密度水泥浆综合性能进行评价,并将低密度水泥浆在固井工程中加以实践检验。对于浅层易漏井、煤层气井来说,固井是关键环节之一,固井质量则在很大程度上取决于低密度水泥浆性能。本论文着重于密度为1.30~1.50g/cm3的低温早强低密度水泥浆体系,该体系具有低温早期强度高,凝结时间短,稳定性好等优点,提高浅层易漏井施工安全及固井质量,为浅层易漏井开发提供有力的技术支持。
[Abstract]:A low-density cement slurry system generally refers to a cement slurry system with a density less than 1.75g/cm3, a mixture of oil well cement, oil well cement lightener, cement admixture and a certain amount of water. The low density cement slurry is in a leaky well or a coalbed gas well. Widely used in long-sealing well cementing. For shallow reservoir easily leaking wells and coalbed gas wells cementing, due to low downhole temperature and more weak cementing substances in low density cement slurry, the hydration rate of cement is slow and the strength is low. At the same time, at low temperature, there are fewer admixtures matching with low density cement slurry. The application effect of low density cement slurry is seriously affected. This paper focuses on three core technologies: particle gradation and optimal selection of low density cement slurry, early strength technology and stability control at low temperature, and compatibility of admixture. High strength beads with good bearing capacity and good performance are selected to meet the requirements of low density design. The microsilicon with good performance is selected to ensure the stability of low density cement slurry and to prevent the strength attenuation of low density cement slurry. Superfine cementing material with good performance was selected to replace some oil well cement to improve the comprehensive performance of low density cement slurry system. The theoretical ratio of each component of cement slurry was determined by particle gradation technique. Through experimental study, the actual proportion of each component of cement slurry system with different densities was determined. In view of the characteristics of low temperature and low density cement slurry system with many admixtures and slow hydration rate, a low temperature early strength agent was selected. Based on the principle of polymer encapsulation and coupling, the suspension stabilizer was selected. From the point of view of filtration loss and low temperature unretarding, the effects of different water loss reducing agents on the properties of low temperature and low density cement slurry were determined. The comprehensive properties of low density cement slurry are evaluated by studying rheological properties, sedimentation stability, water loss, compressive strength and so on, and the low density cement slurry is tested in cementing engineering. Cementing is one of the key links for shallow porous wells and coalbed gas wells, and the cementing quality depends to a great extent on the performance of low density cement slurry. This paper focuses on the low temperature early strength and low density cement slurry system with density of 1.30~1.50g/cm3. The system has the advantages of high low temperature early strength, short setting time and good stability, so as to improve the safety and cementing quality of shallow porous wells. To provide strong technical support for the development of shallow porous wells.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE256.5

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