胶凝酸闭合酸压工艺模拟研究
发布时间：2018-11-21 14:44
【摘要】：闭合酸压技术作为已有裂缝和酸压人工裂缝二次改造的有效手段,广泛地应用于国内外碳酸盐岩储层的增产改造,是一项值得深入研究和推广的重要技术。目前,闭合酸压室内试验研究已经比较成熟,并且在现场施工中得到了很好的应用和发展,为国内外许多油田的增产提供了有效地技术支持。但是,对闭合酸压施工参数优化的模拟研究尚存不足,闭合段长度、注酸排量、酸液用量等施工参数的确定绝大多数依靠作业人员的现场经验,没有形成一套完整科学的优化设计方法。 本文通过室内实验模拟和数值模拟,重点从裂缝宽度变化、酸蚀裂缝导流能力、裂缝闭合模拟及闭合酸压效果几方面进行了胶凝酸闭合酸压工艺模拟研究,形成了一套优化闭合酸压技术设计的方法。 (1)采用三维激光扫描、超声波扫描、能谱分析与酸刻蚀实验和导流能力测试相结合的分析手段,测试了胶凝酸酸岩反应能力、酸蚀裂缝闭合酸化前后导流能力。从实验方面,验证了闭合酸压对近井闭合段的改造效果,尤其对酸化前导流能力较低的情况的改造效果更加显著； (2)推导了Palmer拟三维裂缝扩展数学模型和酸液流动反应模型,通过求解数值模型得到酸压裂缝宽度的二维分布情况； (3)建立了酸压裂缝闭合模型,对酸压后裂缝宽度在不同闭合应力作用下的闭合特征进行模拟,计算出裂缝宽度最终分布,并通过酸液浓度分布和导流能力变化情况确定了闭合段长度； (4)通过裂缝酸化模型对比分析闭合酸化前后裂缝刻蚀形态变化,分析闭合酸蚀裂缝导流能力的影响因素,确定了闭合酸化注酸排量、酸液用量和注入时间： (5)通过室内实验和数值模拟方法系统地计算了不同施工排量、酸液用量等施工参数条件下形成的裂缝宽度和导流能力。根据合理的生产要求筛选出最优的闭合酸压施工设计方案,形成了一套优化闭合酸压施工参数的模拟方法。
[Abstract]:As an effective means of secondary reconstruction of existing fractures and artificial fractures, the closed acid fracturing technology is widely used in the stimulation and transformation of carbonate reservoirs at home and abroad, which is an important technology worthy of further study and popularization. At present, the laboratory test of closed acid pressure has been mature, and has been well applied and developed in field construction, which provides effective technical support for increasing production of many oil fields at home and abroad. However, the simulation study on the optimization of the construction parameters of closed acid compression is still insufficient. The determination of the construction parameters such as the length of the closed section, the amount of acid injected and the amount of acid solution are mostly determined by the field experience of the operators. There is not a complete set of scientific optimization design method. In this paper, through laboratory simulation and numerical simulation, the cementitious acid closed acid fracturing process is simulated from the aspects of crack width change, acid corrosion crack conductivity, crack closure simulation and closing acid compression effect. A set of methods for optimizing the design of closed acid compression technique was developed. The main contents are as follows: (1) by means of three-dimensional laser scanning, ultrasonic scanning, energy spectrum analysis, acid etching experiment and flow conductivity test, the reaction ability of gelling acid rock and the conductivity of acid corrosion crack before and after closed acidification are tested. From the experimental aspect, the effect of the closed acid pressure on the close section of the well is verified, especially for the condition of low conductivity before acidizing. (2) the Palmer pseudo-3D fracture propagation mathematical model and the acid flow reaction model are derived, and the two-dimensional distribution of the acid-compression crack width is obtained by solving the numerical model. (3) an acid-compression fracture closure model is established, and the final distribution of fracture width is calculated by simulating the closure characteristics of acid-compression crack width under different closing stresses. The length of the closed section was determined by the acid concentration distribution and the change of the conductivity. (4) through the comparison of fracture acidification model before and after closed acidizing, the change of fracture etch morphology is analyzed, and the factors influencing the conductivity of closed acid etching fracture are analyzed, and the acid injection capacity of closed acidizing is determined. Acid dosage and injection time: (5) through laboratory experiments and numerical simulation methods, the crack width and conductivity were calculated systematically under the conditions of different construction parameters such as construction displacement and acid content. According to the reasonable production requirements, the optimal design scheme of closed acid-compression construction is selected, and a set of simulation method for optimizing the construction parameters of closed acid-compression construction is formed.
【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】：TE357.2
本文编号：2347281
[Abstract]:As an effective means of secondary reconstruction of existing fractures and artificial fractures, the closed acid fracturing technology is widely used in the stimulation and transformation of carbonate reservoirs at home and abroad, which is an important technology worthy of further study and popularization. At present, the laboratory test of closed acid pressure has been mature, and has been well applied and developed in field construction, which provides effective technical support for increasing production of many oil fields at home and abroad. However, the simulation study on the optimization of the construction parameters of closed acid compression is still insufficient. The determination of the construction parameters such as the length of the closed section, the amount of acid injected and the amount of acid solution are mostly determined by the field experience of the operators. There is not a complete set of scientific optimization design method. In this paper, through laboratory simulation and numerical simulation, the cementitious acid closed acid fracturing process is simulated from the aspects of crack width change, acid corrosion crack conductivity, crack closure simulation and closing acid compression effect. A set of methods for optimizing the design of closed acid compression technique was developed. The main contents are as follows: (1) by means of three-dimensional laser scanning, ultrasonic scanning, energy spectrum analysis, acid etching experiment and flow conductivity test, the reaction ability of gelling acid rock and the conductivity of acid corrosion crack before and after closed acidification are tested. From the experimental aspect, the effect of the closed acid pressure on the close section of the well is verified, especially for the condition of low conductivity before acidizing. (2) the Palmer pseudo-3D fracture propagation mathematical model and the acid flow reaction model are derived, and the two-dimensional distribution of the acid-compression crack width is obtained by solving the numerical model. (3) an acid-compression fracture closure model is established, and the final distribution of fracture width is calculated by simulating the closure characteristics of acid-compression crack width under different closing stresses. The length of the closed section was determined by the acid concentration distribution and the change of the conductivity. (4) through the comparison of fracture acidification model before and after closed acidizing, the change of fracture etch morphology is analyzed, and the factors influencing the conductivity of closed acid etching fracture are analyzed, and the acid injection capacity of closed acidizing is determined. Acid dosage and injection time: (5) through laboratory experiments and numerical simulation methods, the crack width and conductivity were calculated systematically under the conditions of different construction parameters such as construction displacement and acid content. According to the reasonable production requirements, the optimal design scheme of closed acid-compression construction is selected, and a set of simulation method for optimizing the construction parameters of closed acid-compression construction is formed.
【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】：TE357.2
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