萨中油田非主力油层合理驱动压力梯度的确定  

DETERMINATION OF REASONABLE DRIVING PRESSURE GRADIENT IN THE NON-ESSENTIAL RESERVOIR OF SAZHONG OILFIELD

作　　者：赵亮[1] 

机构地区：[1]大庆油田有限责任公司第一采油厂,黑龙江大庆163001

出　　处：《大庆石油地质与开发》2010年第4期85-88,共4页Petroleum Geology & Oilfield Development in Daqing

摘　　要：萨中开发区层间非均质性突出，进入特高含水期开发面临着非主力油层动用难度大等问题。为实现二类油层及三类油层的有效动用，改善其开发状况，必须认清非主力油层的合理驱动压力梯度，以便采取有效措施提高非主力油层的动用程度。应用驱动压力梯度与注采压差的关系公式和数值模拟计算，推算出二类油层及三类油层的合理驱动压力梯度。研究结果表明：在井距为200m时，二类油层的合理驱动压力梯度为0．0250～0．0258MPa／m，三类油层的合理驱动压力梯度为0．0269～0．0291MPa／m。考虑到所建模型为均质模型，所以实际二类油层和三类油层的驱动压力梯度略高于此值。该研究为油田后期精细开发调整提供了参考依据。The characteristics of interlayer anisotropy in Sazhong development area is obvious, and then, this area faces the challenge that non-essential reservoir is difficult to put into production at the stage of extra high water cut. In order to enhance the utilization ratio of type Ⅱ and Ⅲ formations and improve the development situations, the reasonable driving pressure gradient of non-essential reservoir should be understood so as to improve the utilization degree with effective measures. The reasonable driving pressure gradient of type Ⅱ and Ⅲ formations can be calculated by utilizing the relational formula between driving pressure gradient and injection-production pressure differential and numerical modeling calculation. The research results show that at the well spacing of 200 m, the reasonable driving pressure gradient of type II formation is within 0. 025 0 - 0. 025 8 MPa/m, and for type III formation is within 0. 026 9 - 0. 029 1 MPa/m. In view of the homogeneous model, so actual driving pressure gradient of type Ⅱ and Ⅲ formations is slightly higher than above values. This study provides reference for fine development and adjustment at the later stage of oilfield.

关 键 词：非主力油层 压力梯度 注水井井底压力 驱动压差 

分 类 号：TE319[石油与天然气工程—油气田开发工程]