超细水泥浆压堵融合提高高含水砂岩油藏油井产量  

Improves oil well production of high-water content sandstone reservoirs based on fracturing and water shutoff with ultrafine cement

作　　者：马志 段永强 徐文光 唐洁 蔡敬耀 李漫天 张明龙 赵睿 李占峰 张红军 MA Zhi;DUAN Yongqiang;XU Wenguang;TANG Jie;CAI Jingyao;LI Mantian;ZHANG Minglong;ZHAO Rui;LI Zhanfeng;ZHANG Hongjun(Oil&Gas Technology Research Institute of Huabei Oilfield Company,Hebei,Renqiu 062552;Huabei Petroleum Division of Bohai Drilling Engineering Company Limited,Hebei,Renqiu 062552;The First Production Plant of Daqing Oilfield Company,Heilongjiang,Daqing,163000;The ErlianFiliale ofHuabei Oilfield Company,Inner Mongolia,XilinHot City 026000;Department of Oilfield Chemicals of Research Institute of Petroleum Exploration&Development,Beijing 100083;Engineering Technology Department of Huabei Oilfield Company,Hebei,Renqiu 062552;Huabei Petroleum Tiancheng Industrial Group Co.Ltd,Hebei,Renqiu 062552;The Third Production Plant of Huabei Oilfield Company,Hebei,Hejian 062450;School of Nano Science and Technology of University of Science and Technology of China,Anhui,Hefei 230026)

机构地区：[1]中国石油华北油田公司油气工艺研究院,河北任丘062552 [2]中国石油渤海钻探公司华北石油工程事业部,河北任丘062552 [3]中国石油大庆油田采油一厂,黑龙江大庆163000 [4]中国石油华北油田公司二连分公司,内蒙古锡林浩特026000 [5]中国石油勘探开发研究院油田化学研究所,北京100083 [6]中国石油华北油田公司工程技术部,河北任丘062552 [7]中国石油华北油田天成实业集团有限公司,河北任丘062552 [8]中国石油华北油田公司第三采油厂,河北河间062450 [9]中国科学技术大学纳米科学技术学院,安徽合肥230026

出　　处：《石油钻采工艺》2024年第6期695-714,共20页Oil Drilling & Production Technology

摘　　要：(目的意义)解决了现有深部调驱液流转向技术难以实现调堵剂深部有效放置,尤其是难以长效调控高渗条带的难题。采用超细水泥为调堵剂,使用压堵融合的调堵工艺将调堵剂进行深部放置,有效调控深部高渗条带,扩大注水波及体积,有效动用剩余油,能够以低成本高效的方式提高采收率。(方法过程)基于微细裂缝对水流优势方向控制的地质认识,以及水浸岩石力学强度下降30%的实验认识,采用高排量高压力的注入方式,构建压裂堵水结合的超细水泥深穿透液流转向调堵工艺。优化配套超细水泥配方体系,优化后配方为50%G级水泥+50%超细水泥+0.9%缓凝剂+1%减阻剂,水灰比为1∶0.8。通过2组2 m长填砂岩心不同排量与注入压力条件下的水泥物模实证实验,明确超细水泥浆深穿透运移作用机理,进一步针对中高渗油藏高渗条带,形成适应该工艺的技术体系,并开展现场试验。(结果现象)超细水泥浆性能优化后稠化时间8.5 h,失水量75 mL,析水率1%,流动度30 cm,表明优化后的封堵体系具有充足的施工时间。体系流动度好,析水率低,在储层中的滤失不显著,满足深部运移要求。物模实验结果表明,5 L/h低排量注入,水泥浆依靠渗流作用仅渗入40 cm;16 L/h大排量注入,水泥浆挤压岩心形成裂缝可实现2 m以上深穿透,作用距离延长4倍。中高渗油藏A36断块现场试验结果显示,实际施工压力与预期吻合,措施对近井吸水无影响。井组见效情况反映可以实现深部液流转向,有效期12个月以上,累计增油781 t。(结论建议)通过大排量、高压力的注入工艺可以使高密度、大剂量的水泥浆堵剂长效封堵深部高渗条带,实现深部液流转向。Solved the problem of difficulty in achieving effective placement of plugging and adjusting fluids in deep areas and longterm regulation of high permeability zones using existing deep profile control and deep fluid flow diversion technologies.By using ultrafine cement as the plugging material and employing a fusion plugging process based on fracturing and water shutoff,the ultrafine cement slurry is placed deep to regulate the high permeability bands in the deep effectively,expand the water flow volume of the injection water,and effectively utilize the remaining oil,which can improve the recovery rate in a low-cost and efficient manner.Based on the geological understanding of controlling the dominant direction of water flow through micro cracks,and the experimental understanding of a 30% decrease in the mechanical strength of water-immersed rocks,a high displacement and high-pressure injection method was adopted to construct a deep penetration fluid flow turning and plugging process if ultrafine cement combined with hydraulic fracturing and water blocking.Optimize the supporting ultrafine cement formula system,with an optimized formula of 50% G-grade cement+50% ultrafine cement+0.9% retarder+1% drag reducer,and a water-cement ratio of 1∶0.8.The mechanism of penetration and migration of ultrafine cement slurry was confirmed by the concrete model of two sets of 2 m long sandstone cores under different injection rates and pressure.Furthermore,a technical system suitable for this process was developed for high permeability zones in medium-high permeability reservoirs,and on-site tests have been carried out.After optimizing the performance of the ultrafine cement slurry,the thickening time was 8.5 hours,the water loss was 75ml,the water separation rate was 1%,and the fluidity was 30 cm,indicating that the optimized sealing system has sufficient construction time.The slurry can meet the requirements of deep migration with good fluidity,low water separation rate,and insignificant filtration loss in the reservoir.The r

关 键 词：工程技术 提高采收率 深部调驱 深部液流转向 压裂 堵水 超细水泥 

分 类 号：TE357[石油与天然气工程—油气田开发工程]