Sand filling cylinder structure for reservoir well testing experiment

Abstract

The utility model relates to the technical field of oil and gas field development experiments, in particular to a sand filling cylinder structure for reservoir well testing experiments. The sand filling cylinder structure for the reservoir well test experiment comprises a cylinder body, wherein a filter screen, a porous convex distribution disc and a plugging disc are mounted in the cylinder body; a supporting ring frame with the section of an L-shaped structure is fixedly installed on the edge of the filter screen, the outer ring wall of the supporting ring frame is fixedly sleeved with a rubber ring, and a plurality of annular elastic air pipes which are distributed up and down at equal intervals are fixedly embedded in the ring wall of the rubber ring. According to the sand filling cylinder structure for the reservoir well test experiment, the porous convex distribution disc and the filter screen are connected outside the cylinder body to achieve integrated design, so that the sand filling cylinder structure can be conveniently placed in the cylinder body, and the plugging discs installed on the porous convex distribution disc can be replaced with plugging discs with different through cavity diameters. Therefore, steady-state measurement under flow / pressure can be carried out on different cross-cut sand grains in an experiment on the premise that the inner diameter of the cylinder body is not changed.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field development experiments, in particular to a sand filling cylinder structure for reservoir well testing experiments. Background Art

[0002] In oil and gas field development experiments, the sand filling cylinder is a key device for simulating the seepage characteristics of reservoirs. Traditional sand filling models have significant defects:

[0003] 1. Risk of sand particle blockage: Fine sand is easily intruded into the through holes of the distribution plate and pipelines, resulting in the interruption of the experiment (it is necessary to disassemble and clean, damaging the sand body structure);

[0004] 2. Limitation of adaptability: A single flow cross-section is difficult to simulate different fracture widths or heterogeneous reservoirs. Replacing the core components requires the overall disassembly and assembly of the cylinder body, with low operation efficiency;

[0005] 3. Some of the installed filters and porous distribution plates are installed separately. However, due to the poor operation space of the sand filling cylinder, the installation of the filter and the porous distribution plate is time-consuming and laborious, and there is even a hidden danger that gaps appear between the cylinder wall, resulting in errors in the experimental results.

[0006] Therefore, it is necessary to provide a new sand filling cylinder structure for reservoir well testing experiments to solve the above technical problems. Content of the Utility Model

[0007] To solve the above technical problems, the utility model provides a sand filling cylinder structure for reservoir well testing experiments.

[0008] The sand filling cylinder structure for reservoir well testing experiments provided by the utility model includes a cylinder body, in which a filter screen, a porous convex distribution plate and a sealing plate are installed, and the filter screen, the porous convex distribution plate and the sealing plate are overlapped with each other;

[0009] A support ring frame with an L-shaped cross-section is fixedly installed on the edge of the filter screen, and a rubber ring is fixedly sleeved on the outer wall of the support ring frame. A plurality of annular elastic air pipes are fixedly embedded in the wall of the rubber ring at equal intervals up and down;

[0010] A plurality of through holes are formed in the porous convex distribution plate;

[0011] A through cavity is formed in the sealing plate.

[0012] Preferably, an internal thread A part is arranged on the inner wall of the support ring frame.

[0013] Preferably, the convex part of the porous convex distribution plate is adapted to the support ring frame, and an external thread A part is arranged on the outer wall of the convex part of the porous convex distribution plate. The external thread A part is in threaded connection with the internal thread A part.

[0014] Preferably, an internal thread groove is provided on the upper disk surface of the porous convex distribution disk.

[0015] Preferably, a plurality of annular grooves with decreasing diameters are provided on the porous convex distribution disk, and a plurality of through holes distributed in a ring shape are provided in each of the annular grooves.

[0016] Preferably, an external thread B part is provided on the outer disk wall of the plugging disk, and the plugging disk is threadedly connected to the internal thread groove provided on the porous convex distribution disk through the external thread B part. An integrally formed annular protrusion is provided on the lower disk surface of the plugging disk.

[0017] Preferably, a plurality of plugging disks are provided, and the through cavity diameters of the plurality of plugging disks decrease.

[0018] Preferably, an inner cushion ring is fixedly welded near the bottom of the cylinder body, and butt flanges are fixedly installed at both the upper and lower ends of the cylinder body. End covers are fixedly installed at the upper and lower ends of the cylinder body through the butt flanges respectively, and quick connectors are installed on the end covers, and valves are installed on the quick connectors.

[0019] Preferably, a support frame is fixedly installed on the cylinder body.

[0020] Compared with the related art, the sand filling cylinder structure for reservoir well test experiments provided by the present utility model has the following beneficial effects:

[0021] 1. The present utility model connects the porous convex distribution disk and the filter screen outside the cylinder body to achieve an integrated design, thereby facilitating the operation of placing them into the cylinder body. The plugging disks installed on the porous convex distribution disk can be replaced with plugging disks with different through cavity diameters, enabling the experiment to perform steady-state measurement of different cross-sectional sand grains under flow rate / pressure without changing the inner diameter of the cylinder body.

[0022] 2. Since the annular elastic air pipe of the present utility model is an elastic structure, when the support ring frame is installed into the cylinder body, the annular elastic air pipe squeezes the inner wall of the cylinder body to achieve lateral expansion and extension, thereby filling the gap between the rubber ring and the inner wall of the cylinder body. This not only improves the installation stability of the assembled filter screen, porous convex distribution disk, and plugging disk in the cylinder body, but also reduces the vibration amplitude of the filter screen, porous convex distribution disk, and plugging disk in the cylinder body caused by the impact of the flowing fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a preferred embodiment of the sand filling cylinder structure for reservoir well test experiments provided by the present utility model;

[0024] Figure 2 is Figure 1 a schematic cross-sectional structural diagram of the cylinder body shown;

[0025] Figure 3 is Figure 2 the structural schematic diagram of the filter screen shown;

[0026] Figure 4 is Figure 2 one of the structural schematic diagrams of the porous convex distribution plate shown;

[0027] Figure 5 is Figure 2 the second structural schematic diagram of the porous convex distribution plate shown;

[0028] Figure 6 is Figure 2 the structural schematic diagram of the plugging plate with different cavity diameters shown;

[0029] Figure 7 is Figure 2 the structural schematic diagram of the filter screen, the porous convex distribution plate and the plugging plate shown.

[0030] Reference numerals in the figure: 1, cylinder body; 11, docking flange; 12, inner lining gasket ring; 2, filter screen; 21, support ring frame; 21a, internal thread part A; 22, rubber ring; 23, annular elastic air pipe; 3, porous convex distribution plate; 3a, internal thread groove; 3b, external thread part A; 3c, through hole; 3d, annular groove; 4, plugging plate; 4a, cavity; 4b, external thread part B; 41, annular protrusion; 5, end cover; 51, quick connector; 52, valve; 6, support frame. Specific embodiments

[0031] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0032] The following describes the specific implementation of the present utility model in detail with reference to specific embodiments.

[0033] Please refer to Figures 1 to 7 , a sand filling cylinder structure for reservoir well testing experiment provided by an embodiment of the present utility model, the sand filling cylinder structure for reservoir well testing experiment includes a cylinder body 1, a filter screen 2, a porous convex distribution plate 3 and a plugging plate 4.

[0034] In an embodiment of the present utility model, please refer to Figures 1 to 7, a lining gasket ring 12 is fixedly welded near the bottom of the cylinder body 1, and butt flanges 11 are fixedly installed at both the upper and lower ends of the cylinder body 1. End covers 5 are fixedly installed at the upper and lower ends of the cylinder body 1 respectively through the butt flanges 11. A quick connector 51 is installed on the end cover 5, and a valve 52 is installed on the quick connector 51; and a filter screen 2, a porous convex distribution plate 3 and a plugging plate 4 are installed in the cylinder body 1, and the filter screen 2, the porous convex distribution plate 3 and the plugging plate 4 are superposed with each other. Specifically,

[0035] A support ring frame 21 with an L-shaped cross-section is fixedly installed on the edge of the filter screen 2, and an internal thread A part 21a is arranged on the inner wall of the inner ring of the support ring frame 21. A plurality of through holes 3c are formed in the porous convex distribution plate 3, and the convex part of the porous convex distribution plate 3 is adapted to the support ring frame 21. An external thread A part 3b is arranged on the outer wall of the convex part of the porous convex distribution plate 3, and the external thread A part 3b is threadedly connected with the internal thread A part 21a. An internal thread groove 3a is formed on the upper plate surface of the porous convex distribution plate 3. An external thread B part 4b is arranged on the outer wall of the plugging plate 4, and the plugging plate 4 is threadedly connected with the internal thread groove 3a formed in the porous convex distribution plate 3 through the external thread B part 4b. A through cavity 4a is formed in the plugging plate 4, and a plurality of plugging plates 4 are provided, and the diameters of the through cavities 4a of the plurality of plugging plates 4 are decreasing.

[0036] Before using the sand filling cylinder for reservoir well testing experiments in this application, the filter screen 2, the porous convex distribution plate 3 and the plugging plate 4 are superposed and connected with each other. The specific operation steps are as follows:

[0037] Step 1: Insert the convex part at the bottom of the porous convex distribution plate 3 into the support ring frame 21, and thread-fix the external thread A part 3b of the convex part of the porous convex distribution plate 3 with the internal thread A part 21a provided in the support ring frame 21;

[0038] Step 2: Select a plugging plate 4 with a through cavity 4a diameter suitable for the experiment according to the experimental requirements. Then insert the plugging plate 4 into the internal thread groove 3a formed in the porous convex distribution plate 3, and use the external thread B part 4b on the plugging plate 4 to be thread-fixed and connected with the porous convex distribution plate 3, so as to complete the superposition and thread fixation of the filter screen 2, the porous convex distribution plate 3 and the plugging plate 4 in sequence;

[0039] Step 3: Assemble two groups of superposed filter screens 2, porous convex distribution plates 3 and plugging plates 4 according to the operation methods of Step 1 and Step 2;

[0040] Step 4: Install and fix the end cover 5 at the bottom of the cylinder body 1 and ensure sealing;

[0041] Step Five: Place a set of stacked filter screens 2, porous convex distribution plates 3, and plugging plates 4 onto the inner gasket ring 12 inside the cylinder body 1, with the plugging plate 4 positioned at the bottom in contact with the inner gasket ring 12 and the filter screen 2 positioned at the top.

[0042] Step Six: Then, layer by layer, evenly fill with pre-prepared sand grains (dry filling or wet filling) representing reservoir or fracture conditions, and possibly compact them to achieve the target porosity and stress state. After filling to near the top of the cylinder body 1, place another assembled set of filter screens 2, porous convex distribution plates 3, and plugging plates 4, with the plugging plate 4 positioned at the top and the filter screen 2 positioned at the bottom in contact with the sand grains. Then cover the end cap 5 at the top of the cylinder body 1 and ensure sealing.

[0043] Step Seven: Connect the quick connector 51 on the end cap 5 at the top of the cylinder body 1 to an injection pump system (which can inject oil, gas, water, or simulated formation fluid), and connect the quick connector 51 on the end cap 5 at the bottom of the cylinder body 1 to a backpressure control system, a metering system, and / or a downstream container. Then close the outlet valve and pressurize the inside of the cylinder body 1 through the inlet to the target confining pressure (simulating overburden pressure). Fluid saturation (displacing the gas inside the cylinder) may also be required.

[0044] Step Eight: Set and maintain the inlet pressure, outlet pressure (backpressure), and confining pressure, inject fluid at a constant flow rate or constant pressure, measure and record parameters such as inlet pressure, outlet pressure, flow rate, temperature, etc., collect differential pressure and flow rate data in real time, calculate permeability, conductivity, pressure drop curves, etc., and analyze sand body stability, plugging conditions, etc.

[0045] Step Nine: After the experiment is completed, relieve the pressure, remove the end cap 5, carefully take out the sand column (which may be cemented or loose), and clean all components.

[0046] It should be noted that: The porous convex distribution plate 3 is evenly distributed with a large number of through holes 3c, enabling the fluid flowing into / out of the cylinder body 1 to be evenly distributed across the entire cross-section of the sand body, avoiding channeling or fingering. The filter screen 2 is set with a pore diameter much smaller than the minimum particle size of the filled sand grains (usually less than 1 / 2 to 1 / 3 of the minimum sand grain diameter). Its main function is to prevent sand grains from entering and blocking the through holes 3c on the porous convex distribution plate 3 and the quick connector 51 inside the end cap 5, ensuring that the fluid can pass freely while the sand grains are effectively blocked inside the cylinder body 1.

[0047] In this application, the porous convex distribution plate 3 and the filter screen 2 are connected outside the cylinder body 1 to achieve an integrated design, thus facilitating the operation of placing them inside the cylinder body 1. The plugging plate 4 installed on the porous convex distribution plate 3 can be replaced with plugging plates 4 of different through cavity 4a diameters, enabling the experiment to perform steady-state measurements of flow rate / pressure for different cross-sectional sands without changing the inner diameter of the cylinder body 1.

[0048] It should be noted that: the plugging disc 4 located at the bottom of the cylinder body 1 in this application can be without replacement or installation.

[0049] In the embodiment of the present utility model, please refer to Figures 1 to 7 , a rubber ring 22 is fixedly sleeved on the outer wall of the support ring frame 21, and a plurality of annular elastic air pipes 23 which are equally spaced up and down are fixedly embedded on the wall of the rubber ring 22.

[0050] It should be noted that: since the annular elastic air pipe 23 is an elastic structure, when the support ring frame 21 is installed into the cylinder body 1, the annular elastic air pipe 23 squeezes the inner wall of the cylinder body 1 to achieve transverse expansion and extension, thereby filling the gap between the rubber ring 22 and the inner wall of the cylinder body 1. This not only improves the installation stability of the assembled filter screen 2, porous convex distribution disc 3 and plugging disc 4 in the cylinder body 1, but also reduces the vibration amplitude of the filter screen 2, porous convex distribution disc 3 and plugging disc 4 in the cylinder body 1 caused by the impact of the fluid.

[0051] Furthermore, an integrally formed annular protrusion 41 is provided on the lower disc surface of the plugging disc 4, and a plurality of annular grooves 3d with decreasing diameters are provided on the porous convex distribution disc 3, and a plurality of annularly distributed through holes 3c are provided in each annular groove 3d. When the plugging disc 4 changes the flow area of the porous convex distribution disc 3, the annular protrusion 41 is fitted into the corresponding annular groove 3d, improving the stability and sealing performance.

[0052] Among them, a support frame 6 is fixedly installed on the cylinder body 1, thereby improving the stability of the cylinder body 1.

[0053] The circuits and controls involved in the present utility model are all prior arts and will not be elaborated here.

[0054] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present utility model, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A sand filling cylinder structure for reservoir well testing experiments, characterized in that, It includes a cylinder body (1), in which a filter screen (2), a porous convex distribution plate (3) and a plugging plate (4) are installed, and the filter screen (2), the porous convex distribution plate (3) and the plugging plate (4) are superposed with each other; A support ring frame (21) with an L-shaped cross-section is fixedly installed on the edge of the filter screen (2), and a rubber ring (22) is fixedly sleeved on the outer wall of the support ring frame (21). A plurality of annular elastic air pipes (23) are fixedly embedded in the circumferential wall of the rubber ring (22) at equal intervals up and down; A plurality of through holes (3c) are formed in the porous convex distribution plate (3); A through cavity (4a) is formed in the plugging plate (4).

2. The sand filling cylinder structure for reservoir well test experiment according to claim 1, characterized in that, An internal thread part A (21a) is arranged on the inner circumferential wall of the support ring frame (21).

3. The sand-filled cylinder structure for reservoir well test experiments according to claim 2, characterized in that, The convex part of the porous convex distribution plate (3) is adapted to the support ring frame (21), and an external thread part A (3b) is arranged on the outer circumferential wall of the convex part of the porous convex distribution plate (3). The external thread part A (3b) is in threaded connection with the internal thread part A (21a).

4. The sand filling cylinder structure for reservoir well testing experiment according to claim 3, characterized in that, An internal thread groove (3a) is formed in the upper disk surface of the porous convex distribution plate (3).

5. The sand filling cylinder structure for reservoir well testing experiment according to claim 4, characterized in that, A plurality of annular grooves (3d) with decreasing diameters are formed in the porous convex distribution plate (3), and a plurality of through holes (3c) distributed annularly are formed in each of the annular grooves (3d).

6. The sand-filled cylinder structure for reservoir well test experiment according to claim 5, characterized in that An external thread part B (4b) is arranged on the outer disk wall of the plugging plate (4), and the plugging plate (4) is in threaded connection with the internal thread groove (3a) formed in the porous convex distribution plate (3) through the external thread part B (4b). An integrally formed annular protrusion (41) is arranged on the lower disk surface of the plugging plate (4).

7. The sand filling cylinder structure for reservoir well testing experiment according to claim 6, characterized in that, There are multiple plugging plates (4), and the diameters of the through cavities (4a) of the multiple plugging plates (4) decrease gradually.

8. The sand filling cylinder structure for reservoir well testing experiment according to claim 1, characterized in that, A lining gasket ring (12) is fixedly welded near the bottom of the cylinder body (1), and butt flanges (11) are fixedly installed at both the upper and lower ends of the cylinder body (1). End covers (5) are fixedly installed at the upper and lower ends of the cylinder body (1) respectively through the butt flanges (11), and a quick joint (51) is installed on the end cover (5), and a valve (52) is installed on the quick joint (51).

9. The sand filling cylinder structure for reservoir well test experiment according to claim 8, characterized in that, A support frame (6) is fixedly installed on the cylinder body (1).

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