煤层气储层复杂裂缝导流能力影响因素研究
Influencing factors of conductivity of complex fractures in coalbed methane reservoir
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摘要: 煤层气储层水力压裂施工后容易形成比较复杂的裂缝网络，为了深入研究复杂裂缝导流能力的影响因素，使用改进型支撑剂充填层裂缝导流能力测试仪分别评价了支撑剂粒径、铺砂浓度、煤岩弹性模量、煤粉含量以及压裂液类型对煤层气储层复杂裂缝导流能力的影响。结果表明：在相同的铺砂质量分数条件下，“E”型裂缝的导流能力明显大于“T”型裂缝和单一裂缝，即裂缝形态越复杂，裂缝条数越多，导流能力值越大；陶粒作为支撑剂时的裂缝导流能力明显大于覆膜砂和石英砂；铺砂浓度越高、煤岩弹性模量越大，裂缝的导流能力越大；煤粉和压裂液对裂缝导流能力的影响较大，煤粉含量越高，对裂缝导流能力的损害率越高，胍胶压裂液对裂缝导流能力的损害程度最大，清洁压裂液次之，活性水压裂液最小；另外，裂缝形态越复杂，煤粉和压裂液对裂缝导流能力的损害程度越严重。Abstract: Complex fracture network is easy to form after hydraulic fracturing in coalbed methane reservoir. In order to study the influencing factors of complex fracture conductivity, an improved proppant filling fracture conductivity tester was used to evaluate the effects of proppant particle size, sand concentration, coal elastic modulus, coal powder content and fracturing fluid type on complex fracture conductivity in coalbed methane reservoir. The results show that: under the same sand concentration, the conductivity of E-type fracture is significantly greater than that of T-type fracture and single fracture, that is, the more complex the fracture morphology is, the greater the conductivity is; the conductivity of ceramsite as proppant is significantly greater than that of coated sand and quartz sand; the higher the sand concentration is, the greater the elastic modulus of coal and rock is, the greater the conductivity of fracture is; coal powder and fracturing fluid have great influence on fracture conductivity. The higher the content of coal powder is, the higher the damage rate to fracture conductivity is. Guar gum fracturing fluid has the greatest damage to fracture conductivity, followed by clean fracturing fluid and active hydraulic fracturing fluid. In addition, the more complex the fracture morphology is, the more serious the damage degree of coal powder and fracturing fluid to fracture conductivity is.
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