Flexible sidetracking stimulation technology of horizontal wells in low-permeability mature oilfields  

作　　者：WENG Dingwei SUN Qiang LIANG Hongbo LEI Qun GUAN Baoshan MU Lijun LIU Hanbin ZHANG Shaolin CHAI Lin HUANG Rui 

机构地区：[1]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China [2]CNPC Key Laboratory of Oil&Gas Reservoir Stimulation,Langfang 065007,China [3]PetroChina Changqing Oilfield Company,Xi’an 710018,China

出　　处：《Petroleum Exploration and Development》2025年第1期219-229,共11页石油勘探与开发(英文版)

基　　金：Supported by the National Key Research and Development Program of China(2023YFF0615403);CNPC Science and Technology Project(2023ZZ0803).

摘　　要：A flexible sidetracking stimulation technology of horizontal wells is formed to develop the lateral deep remaining oil and gas resources of the low-permeability mature oilfields.This technology first uses the flexible sidetracking tool to achieve low-cost sidetracking in the old wellbore,and then uses the hydraulic jet technology to induce multiple fractures to fracture.Finally,the bullhead fracturing of multi-cluster temporary plugging for the sidetracking hole is carried out by running the tubing string,to realize the efficient development of the remaining reserves among the wells.The flexible sidetracking stimulation technology involves flexible sidetracking horizontal wells drilling and sidetracking horizontal well fracturing.The flexible sidetracking horizontal well drilling includes three aspects:flexible drill pipe structure and material optimization,drilling technology,and sealed coring tool.The sidetracking horizontal well fracturing includes two aspects:fracturing scheme optimization,fracturing tools and implementation process optimization.The technology has been conducted several rounds of field tests in the Ansai Oilfield of Changqing,China.The results show that by changing well type and reducing row spacing of oil and water wells,the pressure displacement system can be well established to achieve effective pressure transmission and to achieve the purpose of increasing liquid production in low-yield and low-efficiency wells.It is verified that the flexible sidetracking stimulation technology can provide favorable support for accurately developing remaining reserves in low-permeability reservoirs.

关 键 词：low-permeability oilfield mature oilfields stimulation flexible sidetracking ultrashort radius horizontal well multi-cluster fracturing Ansai Oilfield field test 

分 类 号：TE3[石油与天然气工程—油气田开发工程]