页岩油压裂水平井变导流能力试井模型研究

doi:10.11885/j.issn.1674-5086.2019.10.09.04

西南石油大学学报(自然科学版) ›› 2021, Vol. 43 ›› Issue (1): 111-119.DOI: 10.11885/j.issn.1674-5086.2019.10.09.04

页岩油压裂水平井变导流能力试井模型研究

叶义平¹, 钱根葆¹, 徐有杰², 高阳¹, 覃建华¹

1. 中国石油新疆油田分公司勘探开发研究院, 新疆克拉玛依 834000;
2. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川成都 610500

收稿日期:2019-10-09 出版日期:2021-02-10 发布日期:2021-01-23
通讯作者: 徐有杰,E-mail:xuyoujie920309@163.com
作者简介:叶义平,1976年生,男,汉族,湖北天门人,高级工程师,主要从事油气田开发研究。E-mail:yeyp@petrochina.com.cn
钱根葆,1960年生,男,汉族,江西新余人,教授级高级工程师,主要从事油田开发研究。E-mail:qianggenbao@petrochina.com.cn
徐有杰,1990年生,男,汉族,甘肃庆阳人,博士研究生,主要从事油气田开发及试井分析方面的研究。E-mail:xuyoujie920309@163.com
高阳,1981年生,男,汉族,辽宁丹东人,高级工程师,主要从事石油地质方面的研究工作。E-mail:gao-yang@petrochina.com.cn
覃建华,1971年生,男,汉族,四川宣汉人,教授级高级工程师,主要从事油气田开发方面的研究工作。E-mail:qjianhua@petrochina.com.cn
基金资助:
国家科技重大专项（2017ZX05070-002，2017ZX05009-004）；中国石油重大科技专项（2017E-04-02，2019E-26-07）

Well Test Analysis of Multi-stage Horizontal Well with Varying Conductivity in Naturally Fractured Shale Oil Reservoir

YE Yiping¹, QIAN Genbao¹, XU Youjie², GAO Yang¹, QIN Jianhua¹

1. Exploration and Development Research Institute of Xinjiang Oilfield, PetroChina, Karamay, Xinjiang 834000, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploition, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Received:2019-10-09 Online:2021-02-10 Published:2021-01-23

摘要/Abstract

摘要： 致密油气、页岩油气等非常规油气资源由于其储层渗透率低，在开采过程中往往采用水平井多级压裂技术来提高单井产量，实现经济开采。基于渗流力学，建立了考虑应力敏感、变裂缝导流能力的裂缝性油气藏多段压裂水平井试井数学模型，通过Laplace和Fourier变换等方法求得模型在Laplace空间下的无因次井底压力解；用Stehfest数值反演计算了实空间无因次井底压力。研究表明，当所有无因次裂缝导流能力之和不变时，如果井筒两端裂缝导流能力高于中部裂缝导流能力，早期阶段生产压差小，压力曲线低；当无因次裂缝导流能力沿裂缝方向减小时，无因次裂缝导流能力变化梯度越大，生产压差越大，早期阶段无因次压力曲线越高；应力敏感系数越大，无因次压力及压力导数曲线上翘幅度越大；裂缝储容比越小，窜流段压力导数曲线“凹子”越深；窜流系数越大，窜流发生越早。

关键词: 页岩油藏, 多段压裂水平井, 试井分析, 变导流能力, 应力敏感

Abstract: Because of low-permeability property, horizontal well multi-stage fracturing technology is widely used to improve oil well production, and achieve economic value, such as tight and low-permeability oil and gas reservoirs. Based on the seepage mechanics, a mathematical model of multi-stage fractured horizontal well is stablished with consideration of stress sensitivity and varying conductivity. The model is solved by employing Laplace and Fourier integral transformation, pressure drop superposition principle and fracture discrete coupling method in Laplace domain. The Stehfest numerical inversion algorithm is used to calculate dimensionless wellbore pressure in real space and dimensionless pressure and its derivative log-log curve is drawn. The results show that if hydraulic fracture conductivity located at wellbore end-node fracture is higher than that of hydraulic fracture located at wellbore middle fracture, dimensionless pressure curve is lower during early bilinear flow and linear flow stage and production pressure difference is smaller. When the dimensionless conductivity decreases along the direction of the hydraulic fracture, the bigger the gradient is, the higher the dimensionless pressure curve is during the early stage, and the bigger the production pressure difference is. The larger the stress sensitive coefficient, the larger the creep amplitude of the dimensionless pressure and its derivative curve; the smaller the reservoir-capacity ratio, the earlier the cross-flow occurs, the longer the cross-flow duration. The larger the cross-flow coefficient, the earlier the channeling occurs. The results can provide guidance for well test data interpretation in fractured reservoirs.

Key words: shale oil reservoirs, multi-stage fractured horizontal well, well test analysis, varying conductivity, stress sensitivity

中图分类号:

TE331.1

叶义平, 钱根葆, 徐有杰, 高阳, 覃建华. 页岩油压裂水平井变导流能力试井模型研究[J]. 西南石油大学学报(自然科学版), 2021, 43(1): 111-119.

YE Yiping, QIAN Genbao, XU Youjie, GAO Yang, QIN Jianhua. Well Test Analysis of Multi-stage Horizontal Well with Varying Conductivity in Naturally Fractured Shale Oil Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(1): 111-119.

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页岩油压裂水平井变导流能力试井模型研究

Well Test Analysis of Multi-stage Horizontal Well with Varying Conductivity in Naturally Fractured Shale Oil Reservoir

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