致密碳酸盐岩储层水力加砂支撑裂缝导流能力实验研究

发布时间：2019-07-27 10:49

【摘要】：水力加砂压裂效果在一定程度上取决于裂缝的导流能力,对于致密碳酸盐岩储层,受地层岩性、支撑剂类型及闭合压力的影响,裂缝导流能力下降较快,影响采出程度,如何在高闭合压力下合理地选择压裂所用支撑剂,对致密碳酸盐岩储层水力加砂压裂设计非常重要。运用多功能裂缝导流能力测试分析系统,选用不同类型的支撑剂,进行致密碳酸盐岩水力加砂支撑裂缝导流能力评价实验。结果表明,对于中强、高强陶粒支撑剂,随着闭合压力的增大,大粒径(16/30目)中强陶粒支撑剂导流能力下降速度明显高于中等粒径(20/40目)中强陶粒支撑剂导流能力;当闭合压力超过69 MPa时,两者相差不大;而这2种粒径的高强陶粒支撑剂的导流能力则相差较大。组合粒径高强陶粒支撑剂的导流能力与16/30目单一粒径高强陶粒支撑剂的导流能力接近,但是单一粒径高强陶粒支撑剂的破碎率大,对地层的伤害也大;在高闭合压力下,对不同组合粒径高强陶粒支撑剂的导流能力进行了实验测定,优选出最佳的组合粒径高强陶粒支撑剂,其组成为16/30目(60%)+20/40目(20%)+30/50目(20%)。
[Abstract]:The effect of hydraulic sand fracturing depends on the conductivity of fractures to a certain extent. For tight carbonate reservoirs, due to the influence of formation lithology, propensant type and closing pressure, the fracture conductivity decreases rapidly and affects the recovery degree. How to select the propylants for fracturing reasonably under high closed pressure is very important for the hydraulic sand fracturing design of tight carbonate reservoirs. By using the multifunctional fracture conductivity test and analysis system and different types of propelling agents, the evaluation experiment of fracture conductivity supported by hydraulic sand addition of tight carbonate rock is carried out. The results show that for medium and high strength ceramsite propensors, with the increase of closing pressure, the flow conductivity of medium and high strength ceramsite proponents with large particle size (16 脳 30 mesh) is obviously higher than that of medium particle size (20 脳 40 mesh). When the closing pressure is more than 69 MPa, there is no significant difference between the two kinds of high strength ceramsite propensors, while the conductivity of the two kinds of high strength ceramsite proponents is quite different from that of medium particle size (20 mesh 40 mesh), but there is no significant difference between the two kinds of high strength ceramsite propensants. The conductivity of the combined particle size high strength ceramsite propensant is close to that of the 16 脳 30 mesh single particle size high strength ceramsite propelling agent, but the fragmentation rate of the single particle size high strength ceramsite propelling agent is large and the damage to the formation is also great. Under high closed pressure, the flow conductivity of high strength ceramsite propynents with different particle sizes was measured experimentally. the optimum composite particle size high strength ceramsite propelling agent was selected, the composition of which was 16 脳 30 mesh (60%), 20 mesh / 40 mesh (20%), 30 mesh (20%), 16 渭 30 mesh (60%), 20 mesh (20%), 30 mesh (20%).
【作者单位】：中国石油长庆油田分公司油气工艺研究院;低渗透油气田勘探开发国家工程实验室;
【基金】：中国石油天然气股份有限公司科学研究与技术开发项目“低/特低渗透油藏有效开发技术研究——长庆油田油气当量上产5000万吨关键技术研究”(1302-1-4)
【分类号】：TE357.12

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