【摘要】：超致密砂巖微米、納米級孔喉發(fā)育且連通性差,氣層具有毛細管壓力高、黏土礦物含量高、含水飽和度低等特征,水鎖是這類氣藏重要的損害方式。現(xiàn)有的水鎖損害評價標準存在未建立初始含水飽和度、地層水鹽析、水敏傷害與水鎖傷害疊加耦合、滲透率測試具有系統(tǒng)誤差、評價不全面等問題,文中以克拉蘇氣田克深9井區(qū)K1bs組超致密砂巖為研究對象,利用核磁成像技術實時監(jiān)測巖樣毛細管自吸過程,運用高溫鈍化、高速離心、恒壓驅替、核磁共振等手段建立該類氣藏水鎖損害評價方法,并據(jù)此進行室內實驗,對比評價蒸餾水、質量分數(shù)8%的KCl溶液與破膠壓裂液等流體對超致密砂巖氣層基質的損害程度。結果表明,氣層孔喉半徑越小,流體黏度越大、礦化度越高,初始含水飽和度與束縛水飽和度差異越大,氣層水鎖損害越強。
[Abstract]:Ultra-tight sandstone micron, nanometer pore throat development and poor connectivity, gas reservoir has the characteristics of high capillary pressure, high clay mineral content, low water saturation and so on. Water lock is an important damage mode of this kind of gas reservoir. The existing evaluation standards of water lock damage have some problems, such as unestablished initial water saturation, formation water salting out, superimposed coupling of water sensitive damage and water lock damage, systematic error in permeability test, incomplete evaluation and so on. In this paper, the ultra-tight sandstone of K1bs formation in well Kesheng 9 of Klassou gas field is taken as the research object, the capillary self-priming process of rock samples is monitored in real time by nuclear magnetic imaging technology, high temperature passivation, high speed centrifugation and constant pressure displacement are used. The evaluation method of water lock damage of this kind of gas reservoir was established by nuclear magnetic resonance (NMR), and the laboratory experiments were carried out to compare and evaluate the damage degree of distilled water, 8% KCl solution and gel fracturing fluid to the matrix of ultra-tight sandstone gas reservoir. The results show that the smaller the pore throat radius is, the greater the fluid viscosity is, the higher the salinity is, the greater the difference between initial water saturation and bound water saturation is, and the stronger the damage of gas reservoir water lock is.
【作者單位】： 西南石油大學地球科學與技術學院;西南石油大學油氣藏地質及開發(fā)工程國家重點實驗室;中國石油塔里木油田油氣工程研究院;
【基金】：國家自然科學基金項目“頁巖氣儲層納米尺度非均質性研究”(51674211)、“致密氣藏儲層干化、提高氣體滲流能力的基礎研究”(51534006)
【分類號】：TE258

【參考文獻】

相關期刊論文 前10條

1 黃亮;石軍太;楊柳;臧加利;張玲;于鵬亮;;低滲氣藏啟動壓力梯度實驗研究及分析[J];斷塊油氣田;2016年05期

2 王志超;何睿;范傳雷;謝信捷;李小剛;胡仲可;;伏龍泉登婁庫組低滲透砂巖氣藏水鎖傷害研究[J];石油化工應用;2016年06期

3 康海亮;林暢松;李洪輝;王開忠;;庫車坳陷依南地區(qū)阿合組致密砂巖氣儲層特征與有利區(qū)帶預測[J];石油實驗地質;2016年02期

4 汪偉琦;熊鈺;金瑾;羅炫;彭國奇;;壓裂縫對低滲致密凝析氣藏單井干氣吞吐效果的影響[J];斷塊油氣田;2016年02期

5 林潼;冉啟貴;魏紅興;孫雄偉;王蓉;;庫車坳陷迪北地區(qū)致密砂巖孔喉形態(tài)特征及其對儲層的影響[J];石油實驗地質;2015年06期

6 喻建;馬捷;路俊剛;曹琰;馮勝斌;李衛(wèi)成;;壓汞—恒速壓汞在致密儲層微觀孔喉結構定量表征中的應用——以鄂爾多斯盆地華池—合水地區(qū)長7儲層為例[J];石油實驗地質;2015年06期

7 彭濤;姚約東;耿丹丹;王利國;;致密氣藏壓裂水平井參數(shù)優(yōu)化與評價模型[J];斷塊油氣田;2015年06期

8 車星祥;盧淵;周s，

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