致密油储集层水平井重复压裂时机优化&#x02014;&#x02014;以松辽盆地白垩系青山口组为例

郭建春; 陶亮; 曾凡辉

doi:10.11698/PED.2019.01.15

石油勘探与开发 >

2019 , Vol. 46 >Issue 1: 146 - 154

DOI: https://doi.org/10.11698/PED.2019.01.15

石油工程

致密油储集层水平井重复压裂时机优化——以松辽盆地白垩系青山口组为例

郭建春 ,
陶亮 ,
曾凡辉

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西南石油大学油气藏地质及开发工程国家重点实验室,成都 610500

郭建春（1970-）,男,博士,西南石油大学石油与天然气工程学院教授、博士生导师,主要从事油气开采与储集层改造理论与技术、非常规天然气开发等方面的教学与研究工作。地址：四川省成都市新都区新都大道8号,西南石油大学油气藏地质及开发工程国家重点实验室,邮政编码：610500。E-mail：guojianchun@vip.163.com

收稿日期: 2018-05-14

修回日期: 2018-10-23

网络出版日期: 2019-01-23

基金资助

国家杰出青年科学基金（51525404）; 国家自然科学基金（51504203）; 国家科技重大专项（2016ZX05002002）

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Optimization of refracturing timing for horizontal wells in tight oil reservoirs: A case study of Cretaceous Qingshankou Formation, Songliao Basin, NE China

GUO Jianchun ,
TAO Liang ,
ZENG Fanhui

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State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation in Southwest Petroleum University, Chengdu 610500, China

Received date: 2018-05-14

Revised date: 2018-10-23

Online published: 2019-01-23

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摘要

以松辽盆地致密油储集层试验区为研究对象,提出了新的理想重复压裂井概念,结合体积压裂水平井特有参数对候选井的重复压裂潜力进行等级划分和排序,利用数值模拟方法建立考虑应力敏感效应的重复压裂产能预测模型,确定最优重复压裂方式和时机。研究表明,在相同的改造簇数下,对产能贡献由大到小的重复压裂方式分别是缝间补压新缝、缝内暂堵转向、老缝加长和重压老缝;重复压裂时机越晚,有效作用期越短。利用考虑地层压力变化的破裂压力预测模型研究了不同生产时间水平井段不同位置破裂压力的变化规律。通过对水平井段不同位置处破裂压力分级,可以确定最优重复压裂时机下的暂堵转向次数和暂堵剂用量。现场应用中单井日产油量由2.3t提高到16.5t,研究成果对同类油藏重复压裂优化设计具有借鉴意义。图17表7参31

关键词： 松辽盆地; 致密油储集层; 重复压裂; 体积压裂; 破裂压力; 暂堵转向

本文引用格式

郭建春 , 陶亮 , 曾凡辉 . 致密油储集层水平井重复压裂时机优化——以松辽盆地白垩系青山口组为例[J]. 石油勘探与开发, 2019 , 46(1) : 146 -154 . DOI: 10.11698/PED.2019.01.15

Abstract

Tight oil reservoirs in Songliao Basin were taken as subjects and a novel idealized refracturing well concept was proposed by considering the special parameters of volume fracturing horizontal wells, the refracturing potential of candidate wells were graded and prioritized, and a production prediction model of refracturing considering the stress sensitivity was established using numerical simulation method to sort out the optimal refracturing method and timing. The simulations show that: with the same perforation clusters, the order of fracturing technologies with contribution to productivity from big to small is refracturing between existent fractured sections, orientation diversion inside fractures, extended refracturing,refracturing of existent fractures; and the later the refracturing timing, the shorter the effective time. Based on this, the prediction model of breakdown pressure considering the variation of pore pressure was used to find out the variation pattern of breakdown pressure of different positions at different production time. Through the classification of the breakdown pressure, the times of temporary plugging and diverting and the amount of temporary plugging agent were determined under the optimal refracturing timing. Daily oil production per well increased from 2.3 t/d to 16.5 t/d in the field test. The research results provide important reference for refracturing optimization design of similar tight oil reservoirs.

Key words： Songliao Basin; tight oil reservoirs; refracturing; volume fracturing; breakdown pressure; temporary plugging and diverting

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