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| 深层致密储层压裂裂缝导流能力实验研究 |
| Experimental study on conductivity of fractures in deep tight reservoirs |
| 投稿时间：2025-02-12 修订日期：2025-03-31 |
| DOI： |
| 中文关键词: 深层致密储层 高闭合压力 加砂压裂 支撑剂 导流能力 |
| 英文关键词:Deep tight reservoir, High closure pressure, Sand fracturing, Proppant, Fracture conductivity |
| 基金项目:国家自然科学基金项目(42272153, 41972138) ；中国石油塔里木油田分公司揭榜挂帅项目（671023060003） 中国石油天然气集团有限公司科技项目（2023ZZ16YJ02, 2023ZZ16YJ04） |
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| 中文摘要: |
| 储层压裂裂缝导流能力是影响油气田增产的重要因素。对于深层致密储层而言，受储层特征、高闭合压力及支撑剂类型等因素影响，导流能力下降较快，严重影响采收率。选择合适的支撑剂对于深层致密储层的压裂设计至关重要。本文选取多种不同类型陶粒支撑剂，开展裂缝导流能力评价实验。结果表明，在高闭合压力下，粒径越大，破碎率越高，导流能力下降幅度也越大，高强度支撑剂在压裂中表现出更好的性能；大粒径支撑剂在组合中所占的比重越大其导流能力就越高，40/70、70/140目陶粒组合比例为2:1时，裂缝导流能力最优；增加铺砂浓度可提高压裂缝导流能力并降低支撑剂嵌入的影响；影响深层致密储层压裂裂缝导流能力的因素按重要性依次排序为支撑剂粒径、强度、粒径组合、铺砂浓度及支撑剂嵌入。在高闭合压力下，基于实验测定，优选40/70目、70/140目陶粒混合比例为2:1，铺砂浓度为9.0 kg/m2，强度为103 MPa的支撑剂进行现场压裂。研究成果可为提高深层致密储层压裂效率提供技术支撑。 |
| 英文摘要: |
| The hydraulic fracturing conductivity of reservoirs is a critical factor influencing the production enhancement in oil and gas fields. For deep tight reservoirs, conductivity diminishes rapidly due to reservoir characteristics, high closure pressure, and proppant type, severely affecting recovery rates. Choosing the appropriate proppant is crucial for the fracturing design of deep tight reservoirs. This study selects various types of ceramsite proppants to conduct fracture conductivity evaluation experiments. The results indicate that under high closure pressure, larger particle sizes lead to higher crush rates and a greater decrease in conductivity. High-strength proppants perform better in fracturing operations. The larger the proportion of large-sized proppants in the combination, the better the fracture conductivity. The optimal fracture conductivity is achieved when the combination of 40/70 and 70/140 mesh ceramic proppants is in a 2:1 ratio. Increasing the sand concentration enhances fracture conductivity and reduces the effects of proppant embedment; The factors influencing fracture conductivity in deep tight reservoirs are ranked in importance as follows: proppant particle size, strength, particle size combination ratios, sand concentration, and proppant embedment. Based on experimental determinations under high closure pressure conditions, proppant with 40/70 mesh and 70/140 mesh ceramsite in a mixture ratio of 2:1, sand concentration of 9.0 kg/m2, and strength of 103 MPa was preferred for on-site fracturing. The research findings offer valuable technical support for improving fracturing efficiency in deep tight reservoirs. |
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