Experimental device for evaluating influence of interlayer and injection-production point on recovery ratio of thick-layer oil reservoir

Abstract

The invention discloses an experimental device for evaluating influence of interlayer and injection-production point on recovery ratio of thick-layer oil reservoir. The experimental device comprises an injection part, a sand filling model part and a displacement product metering part which are connected in sequence, the sand filling model part comprises a sand filling box and an inclinable supporting frame, the sand filling box is filled with quartz sand, a low-permeability block is buried in the quartz sand, and the displacement product metering part is connected with the sand filling box, for simulating an interlayer; at least three simulation wellbores are further inserted into the sand filling box, the well bottom of one simulation wellbore is located above the low-permeability block,the well bottoms of the other two simulation wellbores are located below the low-permeability block, at least one simulation wellbore penetrates through the low-permeability block, during experiment,simulated wellbore can be optionally selected as injection well and production well, the influence of different displacement positions on the recovery ratio can be simulated; and the sand filling boxis located on the inclinable supporting frame, so that the inclination angle of the sand filling box can be adjusted, and the influence of interlayers with different inclination angles on the recoveryefficiency is simulated.

Description

technical field [0001] The invention relates to the technical field of oilfield experimental equipment, in particular to an experimental device for evaluating the influence of interlayers and injection-production points on the recovery rate of thick-bed oil reservoirs. Background technique [0002] The interlayer is a relatively low-permeable or non-permeable part formed by geological processes in oil and gas layers. Its thickness is generally as small as a few centimeters and as large as tens of meters. It has a great influence on the seepage velocity and seepage effect of the fluid inside the flow unit. Existing literature shows that interlayers can reduce water influx and prolong water-free oil production period. At the same time, the location of the interlayer, the location of the interlayer and the injection-production point, and the distribution of the location between the injection-production point all have an important impact on the recovery factor of the oil layer. ...

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Problems solved by technology

At the same time, the location of the interlayer, the location of the interlayer and the injection-production point, and the distribution of the location between the injection-production point all have an important impact on the recovery factor of the oil layer. The indoor physical simulation method is to explore the law of water displacement in the heterogeneous thick oil layer in the layer. However, most of the existing conclusions are drawn in the case of numerical simulation, and there are currently few physical simulation devices for simulating the impact of interlayers and injection-production points on oil recovery

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