【摘要】：單井控制范圍有限和地層能量補充困難一直是困擾致密油儲層開發(fā)的關鍵問題。壓裂過程井下微地震數(shù)據(jù)監(jiān)測表明,二氧化碳無水壓裂改造體積是同等液量常規(guī)水基壓裂的2.5倍,并能顯著增加裂縫的復雜程度。室內(nèi)實驗和壓后原油取樣分析證實,二氧化碳能夠有效降低原油黏度,通過無水壓裂施工實現(xiàn)了原油混相,提高了驅油效率。壓后地層靜壓測試顯示,壓后地層壓力較壓前有顯著提高,具有單井超前補充地層能量的效果。二氧化碳無水壓裂技術已在吉林油田成功應用5口致密油井進行了應用,這些井壓裂后產(chǎn)油量均較壓前有顯著提高,平均單井日增油量2.31t,且施工后鄰井產(chǎn)油、產(chǎn)液量均有不同程度的提高。說明了二氧化碳無水壓裂增產(chǎn)效果良好,該技術在致密油藏開發(fā)中具有廣闊的前景。
[Abstract]:The limited control range of single well and the difficulty of replenishing formation energy have been the key problems puzzling the development of tight oil reservoir. The microseismic data monitoring shows that the volume of carbon dioxide waterless fracturing is 2.5 times that of conventional water-based fracturing with the same amount of fluid, and the fracture complexity can be significantly increased. Laboratory experiments and analysis of crude oil samples after pressure show that carbon dioxide can effectively reduce the viscosity of crude oil, achieve the oil miscibility through waterless fracturing operation, and improve the oil displacement efficiency. The static pressure test shows that the formation pressure after compression is significantly higher than that before compression and has the effect of replenishing formation energy in advance by single well. Carbon dioxide waterless fracturing technology has been successfully applied in 5 tight wells in Jilin Oilfield. After fracturing, the oil production of these wells has been significantly increased, the average daily oil production of single well is 2.31 t, and the oil production of adjacent wells is also obtained after operation. The liquid production increased in varying degrees. It shows that carbon dioxide waterless fracturing has a good effect on increasing production, and this technology has a broad prospect in the development of tight reservoirs.
【作者單位】： 吉林油田公司油氣工程研究院;中國石油大學(北京)石油工程學院;
【分類號】：TE357.7
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本文編號：2366192