Point-contact loosening sandstone core model

Abstract

The invention provides a point-contact loosening sandstone core model, comprising a sand filling pipe body, an upper end head, a lower end head, and a pressing pillar; the upper end head and the lower end head are used for sealing the upper end and the lower end of the sand filling pipe body respectively; the pressing pillar is used for filling and pressing quartz sand in the sand pilling pipe; the sand filling pipe body is an integrated structure; the pressing pillar is formed by dismountably and fixedly connecting the bottom pressing block and several upper pressing blocks; the cross section area of the bottom pressing block is more than the cross section area of the upper pressing blocks, and the outside diameter of the bottom pressing block is adapted to the inside diameter of the sand filling pipe body; an air guide channel is arranged on the bottom pressing block, one end opening of the air guide channel is arranged at the bottom face of the bottom pressing block, and the other end opening is arranged at the side face of the bottom pressing block. The point-contact loosening sandstone core model provided by the application is stable in structure and big in pressure bearing scale; the model has full process of pressure application and uniform force application; the design of the pressure testing point is free from injury to the pipe wall, and simple to dismount, and convenient to operate; the flow conductivity of the inlet and outlet is strong relatively.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a point-contact loose sandstone core model. Background technique [0002] The experimental long core model is a long model designed for the short core displacement contrast effect is not obvious. Various displacement experiments carried out through the long core model are conducive to the exploration of phenomena and laws, but there are certain difficulties in making long cores. [0003] At present, the most commonly used long cores in the laboratory are divided into two types, one is formed by connecting short cores after demoulding, and the other is formed by filling sand with sand filling tubes. Among them, the long core formed by connecting the short cores is a separate entity between the demoulding cores, which is forcibly connected, and there are problems such as capillary discontinuity and large pores at the connection. [0004] The usage rate of this type ...

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Problems solved by technology

[0004] The usage rate of this type of core is less and less, but the sand packing pipe does not have similar problems, but there are still many problems in the process of making the sand packing pipe model: ①The sand packing pipe body is generally composed of three parts Composition, connecting threads and two pipes of equal length. During the sand filling process, in order to make the sand more compact, the pipe wall will be knocked, which will cause serious damage to the pipe wall, and even twist it. In addition, the quartz The sand pipe column is a long columnar structure as a whole, and it is also prone to distortion during the packing process; ②When the end of the sand pipe is filled with sand, because the quartz sand fills the entire pipe body, the end surface of the pressure pipe will be exposed when the quartz sand is pressed , in the final pressing process, the applied force will not be too stable. Generally, the applied force will be reduced to ensure the safety of production, which also leads to the loose core at the end; This process will cause slight deformation of the pipe wall; ④The diversion groove at the end of the ordinary sand filling pipe is closely attached to the quartz sand

There is only one layer of 120-mesh filter screen between them, which is not conducive to diversion

[0005] The above problems will have a certain impact on the development of indoor experiments, which is not conducive to the accuracy of experiments

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