Ultrahigh molecular weight acrylamide polymer high temperature resistance and filtrate loss reduction performance evaluation equipment

Abstract

The utility model discloses ultra-high molecular weight acrylamide polymer high-temperature-resistant filtrate loss reduction performance evaluation equipment which comprises a high-temperature and high-pressure filtrate loss instrument body, a filtrate loss chamber is fixedly installed on the high-temperature and high-pressure filtrate loss instrument body, and a liquid adding pipe and a liquid discharging pipe which are communicated with the interior of the filtrate loss chamber are installed at the top and the bottom of the filtrate loss chamber respectively. Filter paper is mounted in the filtration chamber, two electric push rods working synchronously are fixedly mounted at the top of the filtration chamber, the bottom ends of the electric push rods penetrate through and extend into the filtration chamber, and a pressing plate is slidably mounted in the filtration chamber. According to the utility model, a mechanical supercharging mode is adopted, so that the high-pressure state can be conveniently simulated, the pressure intensity can be more conveniently controlled and adjusted, meanwhile, the supercharging device is stable and reliable, and the experimental data accuracy of the ultra-high molecular weight acrylamide polymer filter loss is improved; the supporting filter plate can support the filter paper, so that the filter paper is prevented from being damaged by huge pressure difference of the leak-off chamber to a certain extent, and a certain protection effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid loss reduction performance evaluation equipment, and more specifically to a device for evaluating the high-temperature resistance fluid loss reduction performance of an ultra-high molecular weight acrylamide polymer. Background Art

[0002] Ultra-high molecular weight acrylamide polymer (UHMW-PAM) is a commonly used additive in water-based drilling fluids, primarily used to increase drilling fluid viscosity, reduce fluid loss, and improve the suspension capacity of drilling fluids. Evaluating the performance of UHMW-PAM in high-temperature, high-pressure (HPHT) environments is crucial because it directly impacts the safety and efficiency of drilling operations. A HPHT fluid loss meter is a specially designed device used to simulate the fluid loss behavior of drilling fluids under HPHT conditions, measuring the volume of filtrate passing through filter paper over a specified period of time, thereby evaluating the fluid loss performance of the drilling fluid.

[0003] The feeding method of the high-temperature and high-pressure filter loss tester with gas-liquid boosting is to feed UHMW-PAM through a pipeline. The UHMW-PAM needs to be continuously pressurized by a booster pump. The high-pressure stability of UHMW-PAM is not high, which affects the accuracy of the experimental results of the filter loss performance. The feeding method of mechanical boosting requires opening the top of the high-temperature and high-pressure filter loss tester. This operation is not only cumbersome and time-consuming, but also requires ensuring that there is no pollution during the opening and feeding process, which is difficult to operate. Utility Model Content

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to provide an ultra-high molecular weight acrylamide polymer high temperature resistance and fluid loss reduction performance evaluation device. The mechanical supercharging method can easily simulate the high-pressure state, which is more convenient to control and adjust than gas or liquid supercharging, thereby improving the accuracy of experimental data on the fluid loss of ultra-high molecular weight acrylamide polymer, and solving the background technology problems.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An ultra-high molecular weight acrylamide polymer high temperature resistance and fluid loss reduction performance evaluation device includes a high temperature and high pressure fluid loss instrument body, a fluid loss chamber is fixedly installed on the high temperature and high pressure fluid loss instrument body, a liquid addition pipe and a liquid discharge pipe connected to the interior of the fluid loss chamber are respectively installed on the top and bottom of the fluid loss chamber, filter paper is installed inside the fluid loss chamber, two synchronously working electric push rods are fixedly installed on the top of the fluid loss chamber, the bottom ends of the electric push rods pass through and extend into the interior of the fluid loss chamber, a pressure plate is slidably installed inside the fluid loss chamber, the bottom end of the electric push rod is fixedly connected to the pressure plate, a piston ring is installed between the pressure plate and the inner wall of the fluid loss chamber, a liquid through hole is opened on the pressure plate, and a one-way valve is fixedly installed inside the liquid through hole.

[0007] As a further description of the above technical solution:

[0008] A sealing gasket is fixedly installed on the top of the pressure plate, wherein the liquid hole is located on the inner side of the sealing gasket, the top of the sealing gasket contacts the inner top wall of the filtration chamber, and the communication port between the liquid adding pipe and the filtration chamber is located on the top of the inner side of the sealing gasket.

[0009] As a further description of the above technical solution:

[0010] A rubber ring is fixedly mounted on the filtration chamber, and the output shaft of the electric push rod is inserted into the inner side of the rubber ring and is in close contact with the rubber ring.

[0011] As a further description of the above technical solution:

[0012] The bottom of the filtration chamber is threadedly connected to a bottom cover, the top of the drain pipe is fixedly connected to the bottom cover, the filter paper is installed between the filtration chamber and the bottom cover, and the inner side of the bottom cover is threadedly connected to a supporting filter plate.

[0013] As a further description of the above technical solution:

[0014] A sealing ring is installed on one side of the filtration chamber opposite to the bottom cover. The two sealing rings are respectively located at the top and bottom of the filter paper, and the two sealing rings are in close contact with the filter paper.

[0015] As a further description of the above technical solution:

[0016] The supporting filter plate is composed of a mounting ring and a mesh plate integrally formed on the inner side of the mounting ring, wherein the mesh bars of the mesh plate are flat in cross section.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] (1) This solution compresses the space for storing ultra-high molecular weight acrylamide polymer and uses mechanical pressurization to easily simulate a high-pressure state and detect the filtration loss of ultra-high molecular weight acrylamide polymer. Compared with gas or liquid pressurization, it is more convenient to control and adjust. At the same time, the pressurization device is stable and reliable, which improves the accuracy of the experimental data on the filtration loss of ultra-high molecular weight acrylamide polymer.

[0019] (2) This solution uses a detachable connection structure, such as a threaded connection between the bottom cover and the filter loss chamber, to facilitate the removal of the bottom cover, the cleaning and replacement of the filter paper, and the cleaning of the interior of the filter loss chamber. The supporting filter plate can support the filter paper during the experiment, to a certain extent preventing the huge pressure difference in the filter loss chamber from causing damage to the filter paper, and thus playing a certain protective role. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a structural diagram of the utility model;

[0021] Figure 2 This is a schematic diagram of the front cross-sectional structure of the filtration chamber of the present invention;

[0022] Figure 3 For this utility model Figure 2 Schematic diagram of the enlarged structure of part A in the middle.

[0023] Description of the numbers in the figure:

[0024] 1. High-temperature and high-pressure filter loss meter body; 2. Filtration chamber; 21. Rubber ring; 22. Bottom cover; 23. Support filter plate; 231. Mounting ring; 232. Grid plate; 24. Sealing ring; 3. Liquid addition tube; 4. Liquid discharge tube; 5. Filter paper; 6. Electric push rod; 7. Pressure plate; 71. Liquid hole; 72. Sealing gasket. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0026] See also Figure 1-3 In the utility model, the high-temperature resistance and filtration loss reduction performance evaluation device of ultra-high molecular weight acrylamide polymer includes a high-temperature and high-pressure filtration loss instrument body 1, a filtration loss chamber 2 is fixedly installed on the high-temperature and high-pressure filtration loss instrument body 1, and a liquid addition pipe 3 and a liquid discharge pipe 4 connected to the interior thereof are respectively installed on the top and bottom of the filtration loss chamber 2, a filter paper 5 is installed inside the filtration loss chamber 2, and two synchronously working electric push rods 6 are fixedly installed on the top of the filtration loss chamber 2. The bottom end of the electric push rod 6 passes through and extends to the interior of the filtration loss chamber 2, and a pressure plate 7 is slidably installed inside the filtration loss chamber 2. The bottom end of the electric push rod 6 is fixedly connected to the pressure plate 7, and a piston ring is installed between the pressure plate 7 and the inner wall of the filtration loss chamber 2. A liquid hole 71 is opened on the pressure plate 7, and a one-way valve 8 is fixedly installed inside the liquid hole 71.

[0027] In the present invention, ultra-high molecular weight acrylamide polymer is added to the interior of the filtration chamber 2 through the liquid adding pipe 3. Before the test, the initial position of the pressure plate 7 is located at the top of the filtration chamber 2. The liquid adding pipe 3 is connected to the communication port of the filtration chamber 2 and the liquid through hole 71. The added ultra-high molecular weight acrylamide polymer falls under the pressure plate 7 through the one-way valve 8 in the liquid through hole 71. The electric push rod 6 drives the pressure plate 7 to move downward to compress the space for storing the ultra-high molecular weight acrylamide polymer. The arrangement of the liquid through hole 71 and the one-way valve 8 facilitates the direct addition of ultra-high molecular weight acrylamide polymer through the pipeline, avoids opening the filtration chamber 2, and improves the experimental efficiency. The mechanical supercharging method can conveniently simulate the high-pressure state and detect the filtration loss of the ultra-high molecular weight acrylamide polymer. Compared with gas or liquid supercharging, it can be more convenient to control and adjust. At the same time, the supercharging device is stable and reliable, thereby improving the accuracy of the experimental data on the filtration loss of the ultra-high molecular weight acrylamide polymer.

[0028] See also Figure 2 , wherein: a sealing gasket 72 is fixedly installed on the top of the pressure plate 7, wherein the liquid hole 71 is located on the inner side of the sealing gasket 72, the top of the sealing gasket 72 contacts the inner top wall of the filtration chamber 2, and the communication port between the liquid adding pipe 3 and the filtration chamber 2 is located on the top of the inner side of the sealing gasket 72.

[0029] In the present invention, the sealing gasket 72 is used to seal the gap between the liquid adding pipe 3 and the communication port of the filtration chamber 2 and the liquid through hole 71, thereby preventing excessive overflow of ultra-high molecular weight acrylamide polymer to the gap between the pressure plate 7 and the filtration chamber 2.

[0030] See also Figure 2 , wherein: a rubber ring 21 is fixedly mounted on the filtration chamber 2 , and the output shaft of the electric push rod 6 is inserted into the inner side of the rubber ring 21 and is in close contact with the rubber ring 21 .

[0031] In the present invention, the gap between the electric push rod 6 and the filtration chamber 2 is sealed by the rubber ring 21 to ensure the airtight effect inside the filtration chamber 2.

[0032] See also Figure 2 and Figure 3 , wherein: the bottom of the filtration chamber 2 is threadedly connected to the bottom cover 22, the top of the drain pipe 4 is fixedly connected to the bottom cover 22, the filter paper 5 is installed between the filtration chamber 2 and the bottom cover 22, and the inner side of the bottom cover 22 is threadedly connected to the support filter plate 23.

[0033] In the present invention, the detachable connection structure of the threaded connection between the bottom cover 22 and the filtration chamber 2 can facilitate the removal of the bottom cover 22, the cleaning and replacement of the filter paper 5, and the cleaning of the interior of the filtration chamber 2. The supporting filter plate 23 can support the filter paper 5 during the experiment, and to a certain extent prevent the huge pressure difference in the filtration chamber 2 from causing damage to the filter paper 5, thereby playing a certain protective role.

[0034] See also Figure 2 and Figure 3 , wherein: a sealing ring 24 is installed on the side opposite to the bottom cover 22 of the filtration chamber 2, and the two sealing rings 24 are respectively located at the top and bottom of the filter paper 5, and the two sealing rings 24 are in close contact with the filter paper 5.

[0035] In the present invention, the sealing ring 24 can seal the gaps between the filter paper 5 and the filter loss chamber 2 and the bottom cover 22 respectively, and at the same time, the filter paper 5 is clamped and fixed to ensure the installation stability of the filter paper 5.

[0036] See also Figure 2 and Figure 3 , wherein: the supporting filter plate 23 is composed of a mounting ring 231 and a mesh plate 232 integrally formed on the inner side of the mounting ring 231 , wherein the cross-section of the mesh bars of the mesh plate 232 is flat.

[0037] In the present invention, the mounting ring 231 is conveniently threadedly mounted on the inner side of the bottom cover 22 , and the flat grid bars of the grid plate 232 can maximize the contact area with the filter paper 5 , thereby improving the supporting and protective effect.

[0038] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. An ultra-high molecular weight acrylamide polymer high temperature resistance fluid loss performance evaluation device, comprising a high temperature and high pressure fluid loss instrument body (1), a fluid loss chamber (2) fixedly mounted on the high temperature and high pressure fluid loss instrument body (1), a liquid addition pipe (3) and a liquid discharge pipe (4) connected to the interior of the fluid loss chamber (2) respectively mounted on the top and bottom thereof, a filter paper (5) mounted inside the fluid loss chamber (2), and characterized in that: Two synchronously working electric push rods (6) are fixedly installed on the top of the filtration chamber (2), the bottom ends of the electric push rods (6) penetrate and extend into the interior of the filtration chamber (2), a pressure plate (7) is slidably installed inside the filtration chamber (2), the bottom ends of the electric push rods (6) are fixedly connected to the pressure plate (7), a piston ring is installed between the pressure plate (7) and the inner wall of the filtration chamber (2), a liquid hole (71) is opened on the pressure plate (7), and a one-way valve (8) is fixedly installed inside the liquid hole (71).

2. The ultra-high molecular weight acrylamide polymer high temperature resistance and fluid loss reduction performance evaluation device according to claim 1, characterized in that: A sealing gasket (72) is fixedly mounted on the top of the pressure plate (7), wherein the liquid hole (71) is located on the inner side of the sealing gasket (72), the top of the sealing gasket (72) contacts the inner top wall of the filtration chamber (2), and the communication port between the liquid adding pipe (3) and the filtration chamber (2) is located on the top of the inner side of the sealing gasket (72).

3. The ultra-high molecular weight acrylamide polymer high temperature resistance and fluid loss reduction performance evaluation device according to claim 1, characterized in that: A rubber ring (21) is fixedly mounted on the filtration chamber (2), and the output shaft of the electric push rod (6) is inserted into the inner side of the rubber ring (21) and is in close contact with the rubber ring (21).

4. The ultra-high molecular weight acrylamide polymer high temperature resistance and fluid loss reduction performance evaluation device according to claim 1, characterized in that: The bottom of the filtration chamber (2) is threadedly connected to a bottom cover (22), the top end of the drainage pipe (4) is fixedly connected to the bottom cover (22), the filter paper (5) is installed between the filtration chamber (2) and the bottom cover (22), and the inner side of the bottom cover (22) is threadedly connected to a supporting filter plate (23).

5. The ultra-high molecular weight acrylamide polymer high temperature resistance and fluid loss reduction performance evaluation device according to claim 4, characterized in that: A sealing ring (24) is installed on one side of the filtration chamber (2) opposite to the bottom cover (22), and the two sealing rings (24) are respectively located at the top and bottom of the filter paper (5), and the two sealing rings (24) are in close contact with the filter paper (5).

6. The ultra-high molecular weight acrylamide polymer high temperature resistance and fluid loss reduction performance evaluation device according to claim 4, characterized in that: The supporting filter plate (23) is composed of a mounting ring (231) and a mesh plate (232) integrally formed on the inner side of the mounting ring (231), wherein the mesh bars of the mesh plate (232) have a flat cross-section.

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