致密砂岩油藏高速通道压裂裂缝导流能力影响因素分析

Influencing factors of fracture conductivity in high-speed channel fracturing in tight sandstone reservoir

金萍,王献,张尚明,王鲁川,卢志敏

JIN Ping, WANG Xian, ZHANG Shangming, WANG Luchuan, LU Zhimin

新疆油田黑油山有限责任公司，新疆 克拉玛依 834000

Heiyoushan Company Ltd., Xinjiang Oilfield, Karamay 834000, China

高速通道压裂能够有效提高致密砂岩油藏的裂缝导流能力、节约压裂液和支撑剂的用量以及降低压裂施工的成本。通过裂缝导流能力测定实验，分析了不同因素对致密砂岩油藏高速通道压裂裂缝导流能力的影响。研究结果表明：支撑剂铺置方式和铺砂浓度对高速通道压裂裂缝导流能力的影响较大，不连续铺砂的裂缝导流能力明显高于连续铺砂，柱塞个数越多，铺砂浓度越高，裂缝导流能力也越高；支撑剂为陶粒时，裂缝导流能力明显高于石英砂和覆膜砂；支撑剂筛目和不同压裂液类型对高速通道压裂裂缝导流能力的影响相对较小；纤维的加入能够有效提高高速通道压裂裂缝导流能力，推荐最佳纤维加量为0.5%。现场应用结果表明，实施高速通道压裂的油井累计产油量明显高于实施常规压裂的油井，高速通道压裂技术能够满足致密砂岩油藏压裂后长期增产的需求。

High-speed channel fracturing can effectively improve the fracture conductivity of tight sandstone reservoir after fracturing, and save the amount of fracturing fluid and proppant, and reduce the cost of fracturing operation. Through the conductivity measurement experiment, the effects of different factors on the conductivity of fracturing fractures in high-speed channel of tight sandstone reservoir are studied. The results show that the proppant placement mode and sand concentration have a great influence on the fracture conductivity of the high-speed channel. The fracture conductivity of discontinuous sanding is significantly higher than that of continuous sanding, and the more the number of plungers, the higher the sand concentration, the greater the conductivity. When the proppant is ceramsite, its conductivity is significantly higher than that of quartz sand and coated sand. The influence of proppant mesh and different types of fracturing fluid on the fracture conductivity of the channel is relatively small. The addition of fiber can effectively improve the fracture conductivity of channel, and the optimal fiber dosage is recommended to be 0.5%. The field application results show that the long-term cumulative oil production of oil wells with high-speed channel fracturing is significantly higher than that of conventional fracturing wells. The high-speed channel fracturing technology can meet the needs of long-term stimulation after fracturing in tight sandstone reservoirs.

10.6056/dkyqt202202016