支撑剂嵌入机理及其导流实验研究
发布时间：2018-07-25 13:07
【摘要】：低渗透油田是今后我国石油工业相当一个时期增储上产的主要资源基础,而水力压裂则是低渗透油田开发的最主要手段。在闭合压力的作用下,被送入裂缝的支撑剂会发生嵌入裂缝壁面的现象。支撑剂嵌入以后,一方面会直接导致裂缝内支撑剂充填层孔隙度降低,另一方面也会减小支撑裂缝的宽度,进而致使支撑裂缝导流能力降低,同时还会造成地层破碎产生碎屑,这些碎屑也会堵塞孔隙通道,引起渗透率和导流能力更进一步的降低,从而降低油气产量。因此,支撑剂嵌入裂缝壁面量化研究对于保障压裂效果具有重大意义。本文通过对支撑剂在裂缝中的状态进行系统的受力分析,在支撑剂嵌入过程中同时考虑支撑剂的变形量对裂缝缝宽的影响,建立支撑剂嵌入深度计算模型、支撑剂压缩变形量计算模型、裂缝宽度变化计算模型以及填砂裂缝导流能力计算模型。在数学模型的基础上,分析支撑剂粒径、支撑剂弹性模量、闭合压力等因素对裂缝宽度和裂缝导流能力的影响规律。并考虑多排铺置情况。论文应用理论研究与室内实验相结合的方法,系统地完成了真实岩板情况下多组支撑剂导流对比实验,并对理论模型进行了验证。通过对于多组实验结果的综合分析,所得裂缝导流能力的变化趋势与模型一致。研究结果表明,在其他条件相同时,支撑剂的粒径、铺砂浓度、支撑剂的弹性模量以及储层的弹性模量,单一因素增大都会引起裂缝导流能力的增大;随着闭合压力的增大,裂缝导流能力减小;而支撑剂的泊松比和储层的泊松比对于裂缝的导流能力影响不大。论文取得的研究成果,可以为压裂施工现场合理选配支撑剂以及控制支撑剂成本提供理论基础,对优化水力压裂增产倍比,保证压裂最佳效果具有指导意义。
[Abstract]:Low permeability oil field is the main resource base of increasing reservoir and production in China's petroleum industry in a certain period in the future, and hydraulic fracturing is the most important means of developing low permeability oil field. Under the action of closed pressure, the proppant that is sent into the crack will be embedded in the crack wall. After the proppant is embedded, the porosity of the proppant filling layer in the fracture will decrease, on the other hand, the width of the supporting fracture will be reduced, and the conductivity of the supporting fracture will be reduced, at the same time, the formation will be broken and the debris will be produced. These detritus also clog pore channels, resulting in further decreases in permeability and conductivity, thus reducing oil and gas production. Therefore, it is of great significance to quantify the wall surface of fracture embedded with proppant in order to ensure the fracturing effect. In this paper, the stress of the proppant in the fracture is analyzed systematically, and the influence of the deformation of the proppant on the crack width is taken into account in the process of inserting the proppant, and the calculation model of the depth of the embedded proppant is established. The calculation model of compressive deformation of proppant, the calculation model of crack width change and the calculation model of flow conductivity of sand filling fracture. Based on the mathematical model, the effects of the particle size of proppant, the elastic modulus of proppant and the closing pressure on the crack width and fracture conductivity are analyzed. And consider the situation of multi-row placement. In this paper, the method of combining theoretical research with laboratory experiments is used to systematically complete the comparative experiments of multiple groups of proppant diversion under the condition of real rock slabs, and the theoretical model is verified. Through the comprehensive analysis of the experimental results, the variation trend of the fracture conductivity is consistent with the model. The results show that under the same conditions, the particle size of proppant, the concentration of sand, the elastic modulus of proppant and the elastic modulus of reservoir will increase with the increase of single factor. The permeability of fracture decreases, but the Poisson's ratio of proppant and the Poisson's ratio of reservoir have little effect on the conductivity of fracture. The research results obtained in this paper can provide a theoretical basis for the reasonable selection of proppant and the cost control of proppant in the field of fracturing. It is of guiding significance to optimize the ratio of hydraulic fracturing production to increase production and ensure the best effect of fracturing.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.12
本文编号：2143914
[Abstract]:Low permeability oil field is the main resource base of increasing reservoir and production in China's petroleum industry in a certain period in the future, and hydraulic fracturing is the most important means of developing low permeability oil field. Under the action of closed pressure, the proppant that is sent into the crack will be embedded in the crack wall. After the proppant is embedded, the porosity of the proppant filling layer in the fracture will decrease, on the other hand, the width of the supporting fracture will be reduced, and the conductivity of the supporting fracture will be reduced, at the same time, the formation will be broken and the debris will be produced. These detritus also clog pore channels, resulting in further decreases in permeability and conductivity, thus reducing oil and gas production. Therefore, it is of great significance to quantify the wall surface of fracture embedded with proppant in order to ensure the fracturing effect. In this paper, the stress of the proppant in the fracture is analyzed systematically, and the influence of the deformation of the proppant on the crack width is taken into account in the process of inserting the proppant, and the calculation model of the depth of the embedded proppant is established. The calculation model of compressive deformation of proppant, the calculation model of crack width change and the calculation model of flow conductivity of sand filling fracture. Based on the mathematical model, the effects of the particle size of proppant, the elastic modulus of proppant and the closing pressure on the crack width and fracture conductivity are analyzed. And consider the situation of multi-row placement. In this paper, the method of combining theoretical research with laboratory experiments is used to systematically complete the comparative experiments of multiple groups of proppant diversion under the condition of real rock slabs, and the theoretical model is verified. Through the comprehensive analysis of the experimental results, the variation trend of the fracture conductivity is consistent with the model. The results show that under the same conditions, the particle size of proppant, the concentration of sand, the elastic modulus of proppant and the elastic modulus of reservoir will increase with the increase of single factor. The permeability of fracture decreases, but the Poisson's ratio of proppant and the Poisson's ratio of reservoir have little effect on the conductivity of fracture. The research results obtained in this paper can provide a theoretical basis for the reasonable selection of proppant and the cost control of proppant in the field of fracturing. It is of guiding significance to optimize the ratio of hydraulic fracturing production to increase production and ensure the best effect of fracturing.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.12
【参考文献】
相关期刊论文 前1条
1 辛军;郭建春;赵金洲;崔荣军;王健;;砂泥岩交互储层支撑剂导流能力实验及应用[J];西南石油大学学报(自然科学版);2010年03期
，本文编号：2143914
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