石油科学通报2024，Vol.9Issue(1)：103-116,14.DOI:10.3969/j.issn.2096-1693.2024.01.008
砾岩致密油地质工程一体化井距优化
Integrated well spacing optimization for geological engineering of conglomerate tight oil
摘要
Abstract
The development of tight oil reservoirs in the Mahu conglomerate formation poses formidable challenges,marked by pronounced reservoir heterogeneity,significant horizontal bidirectional stress difference,the absence of natural fractures,and poor reservoir physical properties.In pursuit of a more economically efficient development strategy,a field trial involving tight well spacing and stereoscopic development was initiated for the first time in the Ma131 well area.Despite achieving a relatively high overall recovery rate in the trial area,the economic benefits fell short of expectations,prompting an urgent need for well spacing optimization.This study adopts an integrated approach that combines geological and engineering principles to establish a comprehensive method and process for optimizing the well spacing of stereoscopic well networks.Additionally,a method for rapidly fitting the hydraulic fracture network model under conditions involving multiple wells and fracturing stages is proposed,combining fracturing parameters and treatment pressure response characteristics.The key steps involve a systematic reservoir en-gineering analysis,utilizing unconventional fracture models based on detailed geological and geomechanical models to simulate complex fracture networks and match the history treatment pressure.The process further includes coupled reservoir numerical simulation for historical production matching.Well spacing optimization in the Ma131 stereoscopic development demonstration area was achieved through an integrated simulation of hydraulic fracturing and production,with validation conducted through a large scale well spacing field trial.The research results show that the analytical fracture length and the simulated fracture length can be mutually verified.The fractures in horizontal wells of the Bai3 section are relatively long,with an average propped half fracture length of 70.1 m and an average hydraulic fracture height of 24.6 m.In the Bai2 section,horizontal well fractures are relatively short and exhibit layer-penetrating effects,with an average propped half fracture length of 61.1 m and an average hydraulic fracture height of 28.3 m.Under conditions of certain permeability in the formation,the well spacing for both devel-opment layers can be appropriately expanded to a range of 200～300 m,ensuring an increase in individual well productivity and economic benefits while maintaining a high recovery rate.The proposed optimized well spacing range can be extended to similar development layers within the same well area,based on the well spacing field trial validation results.And the well spacing optimization method and process proposed in this study,utilizing a stereoscopic well network,can serve as a valuable reference for other unconventional oil and gas reservoir types.关键词
致密砾岩/立体井网/地质工程一体化/多级水力压裂/井距优化Key words
tight conglomerate/stereoscopic well pattern/geological engineering integration/multistage hydraulic fracture/well spacing optimization引用本文复制引用
曹炜,鲜成钢,吴宝成,文恒,于会永,申颍浩,余智超,余凯..砾岩致密油地质工程一体化井距优化[J].石油科学通报,2024,9(1):103-116,14.基金项目
中国石油天然气集团有限公司—中国石油大学(北京)战略合作科技专项(ZLZX2020-01)资助 （北京）
