Rock core wettability measuring device

Abstract

The utility model relates to the technical field of geological research and oil exploration, and discloses a rock core wettability measuring device which comprises a rock core, an outer cylinder body and inner cylinder bodies, one end of each of the outer cylinder body and the inner cylinder body is open, the rock core is arranged in the inner cylinder body, an annular pressure cavity is arranged between the inner cylinder body and the outer cylinder body, in addition, the inner cylinder body is provided with two layers, an electric heating wire is installed between the two layers of inner barrels, a movable plug and an adjusting portion for adjusting the position of the movable plug are further arranged, and a first fluid channel is formed in the movable plug. The rock cores with different lengths can be clamped and fixed by matching with the inner cylinder body, and the rock cores can be heated by electrifying the electric heating wire, so that the wettability change of the rock cores in an underground high-temperature environment can be simulated. And an important basis is provided for subsequent optimization of a thermal recovery process.

Description

TECHNICAL FIELD

[0001] The utility model relates to geological research and petroleum exploration field especially relates to a core wettability measuring device. BACKGROUND

[0002] The core wettability measuring device is a device for determining the affinity of the surface of rock (core) to different fluids (such as oil and water). It generally includes a core holder, a fluid injection system, a pressure measuring device, and an image acquisition system. The core holder is one of the core components. Its function is to fix the core sample and ensure the stability of the core position during the measurement process. It can also be tightly connected with the liquid inlet system and the liquid outlet system to ensure that the fluid can pass through the core uniformly.

[0003] In the Chinese utility model patent with the publication number CN212254482U, a core holder is disclosed, which has an open outer cylinder body at both ends, and the core is clamped by an axial piston and a lower plug. However, underground oil reservoirs are often at a high temperature, for example, the temperature of deep reservoirs can reach 100-200℃ or even higher. Therefore, in order to simulate the real environment, it may be necessary to heat the core during the core wettability measurement experiment to measure the change of core wettability at different temperatures and provide an important basis for subsequent optimization of thermal recovery technology. The above-mentioned device lacks a heating structure, and when heating is needed, the entire device needs to be placed in an oven, which is inconvenient to operate.

[0004] Based on this, the applicant proposes a core wettability measuring device with a heating structure. UTILITY MODEL CONTENTS

[0005] To solve the technical problems of sealing and heating during the core wettability measurement process, the utility model provides a core wettability measuring device.

[0006] The utility model adopts the following technical scheme to realize: a core wettability measuring device, comprising a core and an outer cylinder body, the outer cylinder body is open at one end, and is sleeved outside the core, and additionally comprising:

[0007] An inner cylinder body is open at one end and fixedly connected inside the outer cylinder body, and a ring pressure cavity is arranged between the inner cylinder body and the outer cylinder body;

[0008] An electric heating wire is arranged between the two layers of the inner cylinder body;

[0009] A side plate is arranged at both ends of the outer cylinder body;

[0010] A movable plug is arranged inside the inner cylinder body at one end and extends out of the side plate at the other end, and a first fluid passage is arranged on the movable plug;

[0011] An adjusting part is arranged for adjusting the position of the movable plug.

[0012] By the above technical scheme, the inner cylinder is a cylindrical structure with one end open, and the opening is sealed by the movable plug. The sealing performance is improved. The position of the movable plug can be adjusted by the adjusting part, so that different lengths of cores can be clamped. In addition, the core can be heated by using the electric heating wire through power supply, so as to simulate the wettability change of the core under different temperatures, and provide an important basis for subsequent optimization of thermal recovery process.

[0013] As a further improvement of the above scheme, the side plate includes a fixed side plate and a detachable side plate, the fixed side plate is fixedly connected with the outer cylinder, and the detachable side plate is connected with the outer cylinder through detachable bolts.

[0014] As a further improvement of the above scheme, a second fluid passage is further arranged on the fixed side plate, and the second fluid passage penetrates through the fixed side plate, the outer cylinder and the inner cylinder.

[0015] By the above technical scheme, the second fluid passage is a liquid outlet passage.

[0016] As a further improvement of the above scheme, the adjusting part includes:

[0017] A mounting frame is fixedly connected to one side of the detachable side plate, a shaft sleeve is fixedly arranged in the middle of the mounting frame, and a threaded hole is formed in the shaft sleeve;

[0018] A threaded rod is rotatably connected to one end of the movable plug, and one end of the threaded rod penetrates through the shaft sleeve.

[0019] As a further improvement of the above scheme, one end of the threaded rod is fixedly connected with a control disc.

[0020] By the above technical scheme, a control rod is connected to the control disc, so that the control disc and the threaded rod can be manually rotated. When the threaded rod rotates, the movable plug moves and fixes the core.

[0021] As a further improvement of the above scheme, the outer cylinder is fixedly connected with a ring pressure pipe, and the ring pressure pipe communicates with the ring pressure cavity.

[0022] By the above technical scheme, high-pressure liquid is injected into the ring pressure cavity through the ring pressure pipe, so as to simulate the pressure environment of the core underground.

[0023] As a further improvement of the above scheme, the bottom of the outer cylinder is fixedly connected with a base.

[0024] By the above technical scheme, the base is used to ensure the stability of the core during the experiment,

[0025] Compared with the prior art, the utility model has the beneficial effects that:

[0026] The utility model discloses a threaded rod in the rotation adjustment part is rotated, controls the movable plug to move, and the cooperation inner cylinder body can clamping and fixing the core of different length, and the electric heating wire is electrified through giving, can heat the core, simulates the wettability change of the core under the high temperature environment of underground. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 It is whole structure schematic view of the utility model;

[0028] Fig. 2 It is whole structure sectional view of the utility model;

[0029] Fig. 3 It is the outer cylinder body, core, electric heating wire structure position relation explosion map of the utility model.

[0030] Main symbol explanation: 1, core;2, outer cylinder body;3, inner cylinder body;4, ring pressure cavity;5, ring pressure pipe;6, electric heating wire;7, side plate;8, fixed side plate;9, detachable side plate;10, movable plug;11, fluid passage no. 1;12, fluid passage no. 2;13, adjustment part;14, mounting frame;15, shaft sleeve;16, threaded rod;17, control disc;18, base. DETAILED DESCRIPTION

[0031] Below, combining the drawings and specific implementation, the utility model is further described, and it needs to be explained that under the premise of not conflicting, the following description of each embodiment or each technical feature can be combined to form a new embodiment.

[0032] Please combine Figs. 1-3 The wettability measuring device of the core 1 of the embodiment includes an outer cylinder body 2 and an inner cylinder body 3, and the outer cylinder body 2 and the inner cylinder body 3 are both open-topped cylindrical structures. The inner cylinder body 3 is located inside the outer cylinder body 2 and is fixed at one end. A cavity is reserved between the outer cylinder body 2 and the inner cylinder body 3, which is a ring pressure cavity 4. A gasket is additionally added to the sidewall of the ring pressure cavity 4 for sealing treatment. In addition, two ring pressure pipes 5 are fixedly connected to the outer cylinder body 2, and one end of the two ring pressure pipes 5 communicates with the ring pressure cavity 4. They are respectively used for the output and input of ring pressure liquid. The inner cylinder body 3 is provided with two layers, and an electric heating wire 6 is installed in the middle. One end of the electric heating wire 6 extends out of the inner cylinder body 3 and is connected with an external power source.

[0033] The outer cylinder body 2 is provided with a side plate 7 structure at both ends, and the side plate 7 includes a fixed side plate 8 and a detachable side plate 9. The fixed side plate 8 is welded and fixed at one end of the outer cylinder body 2. The detachable side plate 9 is connected to one end of the opening of the outer cylinder body 2 through detachable screws. And a sealing gasket is arranged between the outer cylinder body 2 and the detachable side plate 9.

[0034] The fixed side plate 8, the outer cylinder 2 and the inner cylinder 3 are provided with holes. The second fluid channel 12 is arranged to pass through the fixed side plate 8, the outer cylinder 2 and the inner cylinder 3 in sequence. The connection between the second fluid channel 12 and the fixed side plate 8, the outer cylinder 2 and the inner cylinder 3 is sealed. The second fluid channel is an outflow channel of the test fluid (such as oil and water).

[0035] The movable plug 10 is arranged at the opening end of the inner cylinder 3. One end of the movable plug 10 is located inside the inner cylinder 3, and the other end penetrates the detachable side plate 9. The core 1 for testing is placed inside the inner cylinder 3 and is fixed by the movable plug 10 and the inner cylinder 3. The movable plug 10 is provided with a hole in the inside, and the first fluid channel 11 is arranged in the hole. The first fluid channel 11 is an inflow channel of the test fluid. After the test fluid passes through the first fluid channel 11, it contacts the core 1.

[0036] In order to fix the cores 1 with different lengths, the adjusting part 13 is arranged on one side of the detachable side plate 9. The adjusting part 13 is connected with the movable plug 10 and is used for controlling the position of the movable plug 10. Specifically, the adjusting part 13 comprises a mounting frame 14, a shaft sleeve 15 and a threaded rod 16. The mounting frame 14 is fixedly connected with the detachable side plate 9. The shaft sleeve 15 is fixedly arranged at the middle position of the mounting frame 14, and the shaft sleeve 15 is provided with a threaded hole. One end of the threaded rod 16 is rotatably connected with the movable plug 10.

[0037] In order to facilitate the rotation control of the threaded rod 16, the control disc 17 is further fixedly connected with one end of the threaded rod 16. The control disc 17 is provided with a rod-shaped structure on the side. The rod-shaped structure is convenient for manual operation and controls the rotation of the threaded rod 16. When the threaded rod 16 rotates, the threaded rod 16 moves along the axial direction under the cooperation of the shaft sleeve 15 and pushes the movable plug 10 to move. The movable plug 10 cooperates with the inner cylinder 3 to clamp and fix the core 1.

[0038] The base 18 is further fixedly connected with the lower bottom of the outer cylinder 2 and is used for supporting the outer cylinder 2 to keep the overall structure stable.

[0039] The implementation process and principle of the core 1 wettability measuring device in the embodiment of the application are as follows:

[0040] (1) When in use, the threaded rod 16 is rotated to drive the movable plug 10 to move, and the movable plug 10 cooperates with the inner cylinder 3 to clamp and fix the core 1. At this time, the first fluid channel 11 and the second fluid channel 12 respectively contact two ends of the core 1. The test fluid (such as oil and water) is injected through the first fluid channel 11.

[0041] (ii): by giving the electric heating wire 6 power, the core 1 can be heated, and the wettability change of the core 1 under the high temperature environment of the underground is simulated. Provide an important basis for subsequent optimization of thermal recovery process. Through the annular pressure pipe 5, high-pressure liquid is injected into the annular pressure cavity 4 to simulate the high-pressure environment of the underground.

[0042] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application. Any non-essential changes and substitutions made by those skilled in the art on the basis of the present application shall fall within the scope of protection of the present application.

Claims

1. A core wettability measuring device, comprising a core and an outer cylinder, characterized in that, The outer cylinder is open at one end and is fitted onto the outside of the core. It also includes: The inner cylinder has an opening at one end and is fixedly connected to the outer cylinder at the other end. An annular compression cavity is provided between the inner cylinder and the outer cylinder. An electric heating wire is provided, wherein the inner cylinder is provided with two layers, and the electric heating wire is disposed between the two layers of the inner cylinder; Side plates are disposed at both ends of the outer cylinder; A movable plug, one end of which is located inside the inner cylinder and the other end extends out of the side plate, and a first fluid channel is opened on the movable plug; An adjustment section is provided for adjusting the position of the movable plug.

2. The core wettability measuring device as described in claim 1, characterized in that, The side plate includes a fixed side plate and a detachable side plate. The fixed side plate is fixedly connected to the outer cylinder, and the detachable side plate is connected to the outer cylinder by detachable bolts.

3. The core wettability measuring device as described in claim 2, characterized in that, The fixed side plate is also provided with a second fluid channel, which penetrates the fixed side plate, the outer cylinder and the inner cylinder.

4. The core wettability measuring device as described in claim 3, characterized in that, The adjustment unit includes: Mounting bracket, the mounting bracket is fixedly connected to one side of the detachable side plate, and a bushing is fixedly provided in the middle of the mounting bracket, the bushing having a threaded hole; A threaded rod, one end of which is rotatably connected to the movable plug, and the other end of which passes through the bushing.

5. The core wettability measuring device as described in claim 4, characterized in that, A control panel is fixedly connected to one end of the threaded rod.

6. The core wettability measuring device as described in claim 1, characterized in that, A ring-pressure pipe is fixedly connected to the outer cylinder, and the ring-pressure pipe is in communication with the ring-pressure cavity.

7. The core wettability measuring device as described in claim 1, characterized in that, A base is fixedly connected to the bottom of the outer cylinder.

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