【摘要】：葡萄花油田葡萄花油層已進(jìn)入高含水開發(fā)階段,進(jìn)一步開發(fā)難度越來越大。為彌補(bǔ)葡萄花油田產(chǎn)量遞減狀況,扶余油層這種特低滲透儲層也將投入開發(fā)。然而,扶余油層儲層孔隙度小、滲透率低、滲流阻力大,需要進(jìn)行壓裂、酸化等增產(chǎn)措施才能具有一定產(chǎn)能。因此,必須對其儲層物性有清楚的認(rèn)識,這樣才能有針對性地制定開發(fā)方案,采取有效的增產(chǎn)措施和提高采收率技術(shù),進(jìn)行科學(xué)合理地開發(fā),以取得良好的開發(fā)效果。本文以葡萄花油田扶余油層為研究對象,以巖石力學(xué)參數(shù)和儲層物性參數(shù)測定為基礎(chǔ),利用脆性指數(shù)、斷裂韌性和抗張強(qiáng)度等對儲層壓裂特性進(jìn)行了評價,以孔喉結(jié)構(gòu)分析和驅(qū)油特性實驗為依據(jù),研究了儲層動用界限,對扶余油層的有效開發(fā)具有非常重要的指導(dǎo)意義。研究表明:(1)扶余油層巖石易產(chǎn)生脆性裂縫,但形成縫網(wǎng)可能性很小。(2)扶余油層水平最大主應(yīng)力方向為N87.95°-92.45°E,水平主應(yīng)力差異系數(shù)為0.29。(3)扶余油層的平均最小啟動壓力梯度為0.0484MPa/m,平均擬啟動壓力梯度為0.1791MPa/m。(4)依據(jù)動用難易程度將扶余油層分為三類:Ⅰ類:滲透率大于1.34×10-3μm2,可以直接采用注水開發(fā),要求注采井距小于150m;Ⅱ類:滲透率1.34×10-3~0.64×10-3μm2,壓裂后折算注采井距小于80m,可以采用注水開發(fā);Ⅲ類:滲透率小于0.64×10-3μm2,需要進(jìn)行水平井分段壓裂,有效改善儲層滲流條件。
[Abstract]:Putaohua reservoir has entered the stage of high water cut, and the further development is becoming more and more difficult. In order to make up for the decline of production, Fuyu reservoir will also be developed. However, the reservoir porosity of Fuyu reservoir is small, the permeability is low, the seepage resistance is large, so it is necessary to fracturing and acidizing in order to have a certain productivity. Therefore, it is necessary to have a clear understanding of the physical properties of the reservoir, so as to formulate the development plan, take effective measures to increase production and improve the recovery technology, and carry out scientific and reasonable development in order to obtain good development results. Based on the measurement of rock mechanics parameters and reservoir physical properties, the fracture characteristics of the reservoir are evaluated by using brittle index, fracture toughness and tensile strength. Based on the analysis of pore throat structure and the experiment of oil displacement characteristics, the limits of reservoir production are studied, which is of great significance for the effective development of Fuyu reservoir. The results show that: (1) brittle fractures are easy to be produced in Fuyu reservoir rock, but the possibility of forming fracture network is very small. (2) the direction of maximum principal stress in the horizontal level of Fuyu reservoir is N87.95 擄-92.45 擄E. The difference coefficient of horizontal principal stress is 0.29. (3) the average minimum starting pressure gradient of Fuyu reservoir is 0.0484 MPA / m, The average pseudo start-up pressure gradient is 0.1791 MPA / m. (4) Fuyu reservoir can be divided into three types according to the difficulty degree of production: the permeability is greater than 1.34 脳 10 ~ (-3) 渭 m ~ (2), it can be directly developed by water injection, and the injection-production well spacing is less than 150 m; Class 鈪，

本文編號：2312367