Numerical Simulation for Controlling Fracture
Propagation of an Infill Well with Radial Multilateral Wells

doi:10.12388/j.issn.1673-2677.2022.03.006

Abstract

Abstract: Fracturing of infill horizontal wells is one of the effective ways to improve the recovery factor of shale oil and gas. However，practices show that the production of an infill well after fracturing is generally lower than that of the parent well，and the fracturing effect is limited. The nature lies in that the fracture propagation of an infill well communicates with the pressure depletion zone of the parent wells，which makes it difficult to produce the remaining inter-well oil and gas resources. This paper proposes that radial multilateral wells be used to control the fracture propagation of an infill horizontal well，so as to increase the contact area between fractures and untapped oil and gas areas and prevent fractures from entering the pressure depletion areas of the parent well，which is expected to be a solution to the engineering problem of infill wells with poor fracturing effect. Therefore，a fracture propagation model of radial multilateral wells is established with the complicated uneven inter-well stress fields taken into account. The influence pattern of the uneven stress fields in different production phases of the parent well as well as the parameters of radial multilateral wells on the propagation of fractures are studied，and the optimal azimuth angle of a lateral borehole is selected. The results show that radial multilateral wells can effectively control the propagation of fractures in those untapped areas in different production phases of the parent well. The feasibility of controlling the fracture propagation of an infill horizontal well with multi-lateral wells is validated. The angle between a lateral borehole and the infill horizontal well is the main controlling factor affecting the forms of fractures.

Key words: radial multilateral well, infill well, fracture propagation, numerical simulation, stress field

摘要： 加密水平井压裂是提高页岩油气采收率的有效途径之一。然而实践表明，加密水平井压裂后产量普遍低于老井，压裂改造效果有限，其本质是压裂裂缝扩展沟通老井压力衰竭区，难以动用井间剩余油气产能。提出利用径向分支井控制加密水平井压裂裂缝扩展，达到提高压裂裂缝与未动用油气区的接触面积且避免裂缝进入老井压力衰竭区的双重目的，有望解决加密水平井压裂效果不佳的工程难题。为此建立了考虑井间复杂非均匀应力场的径向分支井压裂裂缝扩展模型；研究了老井不同投产阶段非均匀应力场、径向分支井参数等对裂缝扩展的影响规律；优选得到了径向分支井最优方位角。结果表明，在老井不同投产阶段，径向分支井可有效控制裂缝在未动用区扩展，验证了其控制加密水平井压裂裂缝扩展的可行性；径向分支井与水平井井眼夹角是影响压裂裂缝形态的主控因素。

关键词: 径向分支井, 加密井, 裂缝扩展, 数值模拟, 应力场

CLC Number:

TE357','1');return false;" target="_blank"> TE357

ZHANG Yupeng, SHENG Mao, WANG Bo, LI Jie, TIAN Shouceng, ZHANG Zhichao, LI Gensheng. Numerical Simulation for Controlling Fracture Propagation of an Infill Well with Radial Multilateral Wells[J]. Xinjiang Oil & Gas, 2022, 18(3): 31-37.

张羽鹏, 盛茂, 王波, 李杰, 田守嶒, 张志超, 李根生. 径向分支井控制加密井裂缝扩展数值模拟[J]. 新疆石油天然气, 2022, 18(3): 31-37.

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Numerical Simulation for Controlling Fracture Propagation of an Infill Well with Radial Multilateral Wells

径向分支井控制加密井裂缝扩展数值模拟

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