Wellbore solid-liquid two-phase mass flow simulation system for complex structure wells

Abstract

The present invention is a solid-liquid two-phase mass flow simulation system for a wellbore with a complex structure, which includes a simulated wellbore, which is composed of a plurality of fixed and connected pipes; the inlet end of the simulated wellbore is connected with a mainstream solid-liquid two-phase fluid supply device, The outlet end of the simulated wellbore is connected with a solid-liquid two-phase fluid separation device; the simulated wellbore is sequentially set as an inlet section, an experimental measurement section and an outlet section from the inlet end to the outlet end; the pipe body of the experimental measurement section is composed of an inner pipe and an outer casing Assuming the structure, a ring-shaped airtight cavity is formed between the inner tube and the outer tube. There are multiple seepage holes evenly distributed on the tube wall of the inner tube, and multiple inflow holes are arranged on the tube wall of the outer tube. The multiple inflow holes are connected with inflow holes. A solid-liquid two-phase fluid supply device; the inlet pipeline, outlet pipeline and inflow pipeline are equipped with fluid flow and pressure collection and processing devices. Therefore, the simulation system can be used in the laboratory to further study the whole process of sand particles entering the pipeline with the production fluid and being carried to the wellhead in the development of unconsolidated sandstone reservoirs.

Description

technical field [0001] The invention relates to an indoor simulation test device in the petroleum industry, in particular to a solid-liquid two-phase mass flow simulation system for a wellbore with a complex structure. Background technique [0002] In the development process of unconsolidated sandstone reservoirs, the application of moderate sand production technology improves oil well productivity, but compared with traditional sand control methods, moderate sand production technology allows formation sand with a certain particle size to enter the sand control screen and maintains a certain production rate. , so that the sand entering the sand control pipeline is carried out of the wellbore. In wells with small vertical and inclination angles, a theoretical model can be established on the basis of Stokes criterion theory. However, in directional wells, horizontal wells, and near-horizontal wells, the interaction between sand particles makes the original theoretical model n...

AI Technical Summary

Problems solved by technology

The disadvantages of this indoor simulation experiment device are: (1) because there is no inflow hole designed on the pipe wall of the pipe body in the test section, the experimental process is actually a constant mass flow, which cannot simulate the variable mass flow law of the production layer in the actual production process; (2) Since the solid phase is the sand particles placed in the tray at the bottom of the experimental tube in advance, the solid phase sand particles are post-mixed during the experiment, and the flow of the experimental fluid to make the solid phase sand particles flow will inevitably cause The unevenness of liquid-solid mixing will have a certain impact on the experimental results

However, the disadvantages of this experimental device are: (1) The experimental device can change the inclination angle of the pipeline through the spiral slope changing mechanism during the experiment, but due to structural limitations such as the characteristics of the spiral slope changing mechanism and the support point located in the middle of the pipeline, The experimental device can only simulate the fluid flow at an inclination angle of 0° to 16°; (2) During the experiment, the pre-mixed pressure conveying method was adopted, but since the power pump adopts a centrifugal slurry pump, during the conveying process, due to the centrifugal The movement mode of the pump will inevitably cause uneven solid-liquid mixing at the outlet of the power pump; (3) The experimental section of the experimental device is not equipped with an inflow hole, so it can only simulate a constant mass flow, and cannot simulate the wall inflow pair in the presence of wall inflow. Influence law of solid-liquid two-phase flow in circular tube

Images