大庆油田M油藏提高新投产井产能压裂技术试验

Experiment of Fracturing Technology for Improving Productivity of New Production Wells in Reservoir M of Daqing Oilfield

大庆油田M油藏进入开发中后期,高含水井及重复压裂井逐年增多,具有改造潜力且开采效果较好的储层不断减少,由于受储层物性及自身条件的限制,新投产的加密井采用常规压裂改造工艺增油上产并不理想。针对目前新投产能加密区块产能井存在的井距小、压后含水高、储层物性差、单井产能低、达不到方案设计要求、影响油田经济有效开发等问题,开展提高新投产井产能技术试验。依据M油藏内各区块的特征,优选了同层多裂缝压裂、大砂量压裂、热造缝结合压裂和短宽缝压裂等4种工艺,并依据区块特征进行压裂工艺和施工参数优选,对现场28口试验井有针对性地实行压裂。结果表明,现场试验的28口井与同区块常规压裂投产井相比,投产初期平均单井日产液提高0.8t,日产油增加0.4t,产能提高15.3%,达到了＂新区提液,加密区控水＂的要求。

In recent years,the reservoir M of Daqing Oilfield has entered the middle and late stages of development.The high water cut wells and refracturing wells have increased year by year.The reservoirs with high potential and good development effect have reduced continuously.Due to the limitation of reservoir physi-cal properties and their own conditions,stimulation of the new infill wells are not ideal by conventional fracturing technology.The productivity wells in the new infill blocks at present have the problems of small well spacing,high water cut after fracturing,poor physical properties,low single well productivity.It can not meet the requirements of the project,and affected the effective development of the oilfield.In view of that,a technology experiment for enhancing productivity of the new production wells was carried out.According to the features of each block in reservoir M,multi-fracture fracturing in the same layer,more-sand fracturing,fracturing with thermal fracture generation and fracturing with short-wide fractures four techniques were selected.Fracturing technology and operation parameters were optimized and 28 testing wells in the field were frac-tured.The results show that the initial daily liquid increased by 0.8t,the daily oil production increased by 0.4t,and the initial productivity increased by 15.3% compared with the conventional fracturing wells in the same block,which has reached the requirements of ＂liquid increase in the new block and water cut control in the infill block＂.