基于地质工程一体化压裂模型的页岩油压裂方案优化——以吉木萨尔凹陷芦草沟组为例  

Shale oil fracturing scheme optimization based on geology-engineering integrated fracturing model:taking Lucaogou Formation,Jimsar Sag as an example

作　　者：李嘉成 邹家伟 田刚 王亮 王俊超 佟亮 LI Jiacheng;ZOU Jiawei;TIAN Gang;WANG Liang;WANG Junchao;TONG Liang(Engineering Technology Research Institute,Xinjiang Oilfield Company(Supervision Company),Karamay 834000,China;Yuanwangjingsheng Technology(Beijing)Co.,Ltd.,Beijing 100083,China)

机构地区：[1]中国石油新疆油田分公司工程技术研究院(监理公司),新疆克拉玛依834000 [2]北京远望景盛科技发展有限公司,北京100083

出　　处：《断块油气田》2025年第1期35-46,共12页Fault-Block Oil & Gas Field

基　　金：中国石油集团重大科技专项“新疆油田页岩/致密油气体积改造技术提升攻关与现场试验”(2022ZS0607)。

摘　　要：芦草沟组页岩油储层致密、天然裂缝发育,采用小井距开发时,井间应力干扰严重,优选压裂施工参数、明确压后裂缝扩展规律是提升芦草沟组开发效益的关键。为减少井间、簇间应力对页岩油小井距多层立体井网压裂的干扰,同时降低重复改造,文中在明确芦一段裂缝特征、地应力分布的基础上,建立了芦一段精细地质模型,在其约束下联合FracMan平台建立了地质工程一体化的压裂数值模型,并基于该模型开展了加砂量、簇间距、井距等压裂参数优化的研究。结果表明,芦一段最优加砂量为1600 m^(3),合理簇间距为6 m,最优井距为200~250 m。现场微地震监测与模拟缝网吻合度高达91.2%,表明地质工程一体化压裂模型的模拟结果可真实反映地下实际缝网。芦一段压裂后形成了“水力主缝”型、“水力主缝+天然裂缝”型和“天然裂缝”型等3种缝网。研究区以“水力主缝”型缝网为主,压后裂缝的半缝长集中在70~105 m,缝高主要分布在20~30 m。虽然缩小井距和簇间距可以增加“水力主缝”型缝网数量,获得更大的半缝长和缝高,使储层改造更充分,但也极易产生井间窜流,造成最终采收率的损失。The shale oil reservoir in Lucaogou Formation is tight with natural fracture development,There are serious inter-well stress interferences when small well spacing development is employed.Optimizing fracturing construction parameters and clarifying the fracture propagation laws after fracturing are keys to improving the development benefits of Lucaogou Formation.In order to reduce the interference of inter-well and inter-cluster stress on shale oil small spacing multi-layer three-dimensional well pattern fracturing and reduce restimulation,a fine geological model of Lu 1 Member is set up based on the clarification of fracture characteristics and ground stress distribution of Lu 1 Member,under whose constraints a geology-engineering integrated fracturing numerical simulation model is established combined with FracMan.Study on the optimization of fracturing parameters such as sand addition amount,cluster spacing and well spacing is conducted based on this model.The results show that the optimal sand addition amount and cluster spacing are 1600 m^(3) and 6 m respectively,and the optimal well spacing is 200-250 m.The goodness of fit between field microseismic monitoring and simulated fracture network is as high as 91.2%,which indicates that simulation results of the integrated fracturing model can truly reflect the actual underground fracture network.Three kinds of fracture network,namely"hydraulic main fracture","hydraulic main fracture+natural fracture"and"natural fracture"are formed after the fracturing of Lu 1 Member.The research area is dominated by"hydraulic main fracture",with the fracture half-length concentrated in 70-105 m and the fracture height mainly distributed in 20-30 m after fracturing.Although reducing well spacing and cluster spacing can increase the number of"hydraulic main fracture"fracture network,obtaining larger half-fracture length and fracture height which leads to fuller reservoir stimulation,it is also extremely easy for inter-well channeling to occur,resulting in loss of final recovery eff

关 键 词：页岩油 天然裂缝 井距优化 芦草沟组 吉木萨尔凹陷 

分 类 号：TE319[石油与天然气工程—油气田开发工程]