石油钻采工艺2023，Vol.45Issue(5)：625-631,7.DOI:10.13639/j.odpt.202303028
三塘湖油田非常规油藏水平井复合重复压裂技术
Compound re-fracturing technology for horizontal wells of unconventional oil reservoirs in the Sangtanghu oilfield
摘要
Abstract
The unconventional oil reservoir of the Santanghu oilfield suffers from rapid production decline and low recovery factors of a considerable part of horizontal wells,due to the inferior reservoir physical properties,high heterogeneity,and the small reservoir stimulation scale and low recovered degrees of the primary fracturing treatment.Given this,the compound re-fracturing technology of horizontal wells integrating supplementary perforating based on refined interval division,pre-fracturing energy charging,expansion of reservoir stimulated volumes and promotion of imbibition displacement efficiency and fracture conductivity was developed,and the corresponding treatment parameters were optimized.In 2021-2022,23 horizontal wells were re-fractured,and the effective treatment rate reached 100%.The average daily oil production of wells was increased from 2.2 t/d before fracturing to 10.5 t/d after fracturing,indicating a daily oil gain of 8.3 t.The average cumulative oil gain of wells has exceeded 1 400 t,and the input-output ratio surpassed 1:1.2,which demonstrates excellent production stimulation performance and high economic revenues.This technology is also valuable for production stimulation of old horizontal wells and improvement of ultimate recovery factors for other unconventional reservoirs.关键词
三塘湖/非常规油藏/水平井/重复压裂/细分补孔/压前补能/驱油Key words
Sangtanghu/unconventional oil reservoir/horizontal well/re-fracturing/supplementary perforating based on refined division/pre-fracturing energy charging/displacing oil分类
能源科技引用本文复制引用
向洪,张坚平,张田田,杨飞,崔翔..三塘湖油田非常规油藏水平井复合重复压裂技术[J].石油钻采工艺,2023,45(5):625-631,7.基金项目
中国石油天然气股份公司科研项目"老区直井/定向井提高重复压裂增产效果技术研究与现场试验"(编号:kt2022-17-4). （编号:kt2022-17-4）
