吕振虎,张羽鹏,石善志,等. 水平井体积压裂高速冲蚀套管内井下行为特征研究[J]. 石油钻探技术,2024,52(4):1-11. DOI: 10.11911/syztjs.2024072
引用本文: 吕振虎,张羽鹏,石善志,等. 水平井体积压裂高速冲蚀套管内井下行为特征研究[J]. 石油钻探技术,2024,52(4):1-11. DOI: 10.11911/syztjs.2024072
LYU Zhenhu, ZHANG Yupeng, SHI Shanzhi, et al. Behavior characteristics of horizontal well volume fracturing in high-speed erosion casing[J]. Petroleum Drilling Techniques, 2024, 52(4):1-11. DOI: 10.11911/syztjs.2024072
Citation: LYU Zhenhu, ZHANG Yupeng, SHI Shanzhi, et al. Behavior characteristics of horizontal well volume fracturing in high-speed erosion casing[J]. Petroleum Drilling Techniques, 2024, 52(4):1-11. DOI: 10.11911/syztjs.2024072

水平井体积压裂高速冲蚀套管内井下行为特征研究

Behavior characteristics of horizontal well volume fracturing in high-speed erosion casing

  • 摘要: 为给水平井体积压裂设计优化、降低压裂工具下入阻卡风险提供理论依据,采用自主研发的大型孔眼冲蚀现场试验模拟系统,进行了高速携砂液冲蚀下套管及压裂材料的变化试验,基于试验数据建立了动态描述孔眼内壁冲蚀形态的模型。试验结果表明,携砂液加砂浓度增大,冲蚀后孔眼内壁最大直径与泵送压降幅度逐渐增大;套管内壁支撑剂附着层厚度由井筒跟端至趾端呈逐渐增大的趋势,可使下级套管内径缩小35 mm,随着加砂浓度逐渐增大,套管跟端附着量逐渐增加,但趾端附着量逐渐减小;随着携砂液加砂浓度增大,冲蚀后支撑剂的破碎程度逐渐变强,碎屑占比提高11%,冲蚀后压裂液黏度降低幅度先升高后降低,压裂液黏度最大降幅可达52%。建立了高速冲蚀套管内支撑剂运移数值模型,分析了套管内支撑剂颗粒运移的规律,验证了通过试验得出的动态描述孔眼内壁冲蚀形态的模型。研究结果可为水平井压裂优化施工参数和降低工具下入阻卡风险提供依据。

     

    Abstract: The self-developed large field experimental simulation system for hole erosion was used to carry out the experiment on the change law of casing and fracturing materials under the erosion of high-speed sand-carrying fluid. Based on the experimental data, a dynamic model describing the erosion morphology of the inner wall of the hole was established. The rules of casing hole erosion, proppant adhesion, and fracturing material performance loss before and after the high-speed sand-carrying fluid flowing through the hole were clarified. A numerical model for the migration of proppant in high-speed erosion casing was established, and the law of proppant particle migration in casing was analyzed. The variation law of pore shape was verified. It provides theoretical support for the optimization of the volume fracturing design of horizontal wells and the reduction of the risk of fracturing tools running into the block. The experimental results show that the maximum diameter of the inner wall of the hole and the pumping pressure drop amplitude gradually increase with the increase of the concentration of the sand-carrying fluid; The thickness of the proppant attachment layer on the inner wall of the casing is gradually increasing from the wellbore heel to the toe end, which can reduce the inner diameter of the lower string by 35 mm. With the sand concentration gradually increasing, the attachment amount at the heel end of the casing gradually increases, but the attachment amount at the toe end gradually decreases; With the increase of the concentration of sand-carrying fluid sand, the breaking degree of proppant after erosion gradually becomes stronger, and the proportion of debris increases by 11%. The reduction of fracturing fluid viscosity after erosion first increases and then decreases, and the maximum reduction of fracturing fluid viscosity can reach 52%.

     

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