过筛管压裂增产技术研究

发布时间：2019-04-23 19:13

【摘要】：注聚开采以其技术简单、经济有效性高等特点,已成为海上油田高效开发的重要技术手段之一。随着注聚规模的扩大及注入时间的延长,开采区油井堵塞现象日益凸显,对注聚开采的总体效果造成不利影响。受限于平台作业空间和筛管完井的完井方式,现有解堵技术虽取得一定效果,但措施有效期逐级变差。因此,本文提出过筛管压裂增产技术体系,以破坏筛管的方式对目标层段实施压裂充填,强化解堵效果,延长措施有效期。本文采用理论分析和数值模拟相结合的方法,对过筛管压裂的主体工艺技术和配套工艺技术开展了研究,取得的成果及认识如下： (1)确立了以水力喷砂射孔的方式对筛管进行定点破坏,为后续压裂增产措施提供优质的孔眼流道,采用计算流体力学基本方法对喷砂射流的流场进行数模研究,分析了射流速度和喷射间距对含砂射流流场分布的影响,为射流参数的优化及合理选取提供参考。 (2)针对注聚区疏松砂岩油藏,从机理上论证了压裂充填措施的防砂和增产效果,并从控支撑剂回流、控砂稳砂的角度出发,对过筛管压裂工艺的配套技术开展了研究,确保措施增产效果的有效性。 (3)以统一压裂设计为基本理论,同时结合压裂充填的工艺特点,从裂缝缝高的准确预测和措施后支撑剂嵌入对缝宽的影响出发,将统一压裂设计方法进行适用性改进,为压裂充填最佳裂缝尺寸的确定提供理论依据。 (4)综合考虑疏松砂岩应力敏感性和长期裂缝导流能力衰减,建立了油藏-裂缝渗流系统三维两相数学模型,以裂缝参数一缝长、导流能力为切入点,对措施的增产潜能进行分析。结果表明,中高渗储层压裂充填后产量对缝长变化的敏感性较低,而对导流能力变化的敏感性较高。因此在过筛管压裂中,采用支撑剂组合、尾追树脂砂等工艺措施提高或保持裂缝导流能力,有利于提升增产潜能。通过以上方面的研究,初步形成了过筛管压裂增产技术体系,为注聚区疏松砂岩油藏筛管完井单井的解堵、增产、增注措施提供了新的实用技术,为过筛管压裂增产增注技术体系的后续优化研究奠定了基础。
[Abstract]:Because of its simple technology and high economic efficiency, polymer injection mining has become one of the important technical means for high efficiency development of offshore oil fields. With the expansion of polymer injection scale and the prolongation of injection time, the phenomenon of oil well blockage is becoming more and more prominent in the production area, which has an adverse effect on the overall effect of polymer injection production. Limited to the platform operation space and the completion mode of sieving tube completion, the existing plugging removal technology has achieved some results, but the effective period of the measures has become worse step by step. Therefore, this paper puts forward the technical system of over-sieve tube fracturing and increasing production, and carries out fracturing filling on the target zone by destroying the sieve tube, strengthening the effect of removing plugging and prolonging the effective period of the measures. By means of theoretical analysis and numerical simulation, the main technology and matching technology of over-sieve tube fracturing are studied in this paper. The achievements and understandings are as follows: (1) the fixed-point destruction of the sieve pipe by hydraulic sand blasting is established, which provides high-quality perforated passage for subsequent fracturing and increasing production measures. The basic method of computational fluid dynamics is used to study the flow field of sand blasting jet. The influence of jet velocity and jet spacing on the flow field distribution of sand jet is analyzed, which provides a reference for the optimization and reasonable selection of jet parameters. (2) in view of loose sandstone reservoir in polymer injection area, the effect of sand control and increase production of fracturing filling measures is demonstrated in mechanism. From the point of view of controlling proppant reflux and sand stabilization, the matching technology of over-sieve pipe fracturing technology is studied. Ensure the effectiveness of measures to increase production. (3) taking the unified fracturing design as the basic theory and combining the technological characteristics of the fracturing filling, based on the accurate prediction of the fracture height and the influence of proppant embedding on the fracture width, the applicability of the unified fracturing design method is improved. It provides a theoretical basis for determining the optimum fracture size of fracturing filling. (4) considering the stress sensitivity of loose sandstone and the attenuation of long-term fracture conductivity, a three-dimensional two-phase mathematical model of reservoir-fracture seepage system is established. The potentiality of the measures to increase production is analyzed. The results show that the yield of medium and high permeability reservoir after fracturing is less sensitive to the change of fracture length, but higher to the change of conductivity. Therefore, the adoption of proppant combination, tail pursuit of resin sand and other technological measures to improve or maintain the capacity of fracture conductivity in the fracturing of sieving pipe is beneficial to enhance the potential of increasing production. Through the above-mentioned research, the technology system of over-sieve tube fracturing and increasing production has been preliminarily formed, which provides a new practical technique for removing plugging, increasing production and increasing injection measures for single well completion in loose sandstone reservoir in polymer injection area. It lays a foundation for the follow-up optimization of the technology system of fracturing, increasing production and increasing injection of sieving tube.
【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】：TE357

【参考文献】