葡萄花油田扶余油层压裂特性及动用界限研究
发布时间：2018-11-05 14:29
【摘要】：葡萄花油田葡萄花油层已进入高含水开发阶段,进一步开发难度越来越大。为弥补葡萄花油田产量递减状况,扶余油层这种特低渗透储层也将投入开发。然而,扶余油层储层孔隙度小、渗透率低、渗流阻力大,需要进行压裂、酸化等增产措施才能具有一定产能。因此,必须对其储层物性有清楚的认识,这样才能有针对性地制定开发方案,采取有效的增产措施和提高采收率技术,进行科学合理地开发,以取得良好的开发效果。本文以葡萄花油田扶余油层为研究对象,以岩石力学参数和储层物性参数测定为基础,利用脆性指数、断裂韧性和抗张强度等对储层压裂特性进行了评价,以孔喉结构分析和驱油特性实验为依据,研究了储层动用界限,对扶余油层的有效开发具有非常重要的指导意义。研究表明:(1)扶余油层岩石易产生脆性裂缝,但形成缝网可能性很小。(2)扶余油层水平最大主应力方向为N87.95°-92.45°E,水平主应力差异系数为0.29。(3)扶余油层的平均最小启动压力梯度为0.0484MPa/m,平均拟启动压力梯度为0.1791MPa/m。(4)依据动用难易程度将扶余油层分为三类:Ⅰ类:渗透率大于1.34×10-3μm2,可以直接采用注水开发,要求注采井距小于150m;Ⅱ类:渗透率1.34×10-3~0.64×10-3μm2,压裂后折算注采井距小于80m,可以采用注水开发;Ⅲ类:渗透率小于0.64×10-3μm2,需要进行水平井分段压裂,有效改善储层渗流条件。
[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 掳-92.45 掳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，
本文编号：2312367
[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 掳-92.45 掳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，
本文编号：2312367
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