Crack plate and underground leakage evaluation device provided with same and used for drilling fluid

Abstract

The utility model provides a crack plate and install the underground leakage evaluation device of crack plate for drilling fluid, including crack plate, crack plate including plate body, the plate body is provided with the channel, the channel passes through the plate body, the plate body includes the top surface and the bottom surface, the two ports of channel are respectively located in the top surface and the bottom surface, the two ports are located in the two ports, and the two ports are located in the bottom surface. The port on the top surface is larger than the port on the bottom surface. The underground leakage evaluation device for the drilling fluid comprises a drilling fluid cup, the drilling fluid cup comprises a cup body, and a crack plate is installed in the cup body. The structure solves the problems that the PPA type permeability plugging instrument can better fit the actual situation of the site and can select different leakage channels for simulation when the plugging capacity of the plugging material is detected, and can also detect the pressure bearing capacity of the plugging plug formed by the plugging material at the same time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of petroleum, especially relate to a fracture plate and install the downhole leakage evaluation device for drilling fluid with the fracture plate. BACKGROUND

[0002] In the drilling process, formation leakage is a common and thorny problem. The existence of formation leakage channel will cause a large amount of drilling fluid loss, not only affect the normal drilling operation, but also cause huge economic losses. In order to effectively deal with the formation leakage, it is usually necessary to add plugging material to the drilling fluid to prepare plugging slurry for plugging operation. However, how does the plugging effect of the plugging material need to be tested by experiment.

[0003] At present, PPA type permeability plugging instrument is widely used in the industry to test the plugging capacity of plugging material. The core component of the equipment is the fracture plate, which simulates the process of plugging agent bridging to form plugging in the gap when plugging slurry passes through the fracture plate, so as to evaluate the plugging performance of the plugging agent. However, the conventional fracture plate used in the existing PPA type permeability plugging instrument has many limitations. Its fracture is usually a straight gap with fixed width, which cannot simulate the complex and variable leakage channel shape in the formation, such as multiple fractures, irregular channel shape, etc., resulting in a large deviation between the experimental results and the actual formation leakage. In addition, the thickness of the conventional fracture plate is generally different from the thickness of the actual formation leakage channel, which further affects the accuracy of the experiment. More importantly, the existing fracture plate is in direct contact with the bottom of the cup cover of the drilling fluid cup. When the pressure continues to increase in the experiment, the pressure will be transmitted from the plugging plug to the bottom of the cup cover. As a supporting component, the bottom of the cup cover cannot accurately reflect the pressure bearing capacity of the plugging plug itself, so that the experimental results cannot comprehensively evaluate the plugging effect of the plugging material in the actual downhole environment.

[0004] Therefore, in view of the above-mentioned problems in actual production and implementation, a fracture plate and a downhole leakage evaluation device for drilling fluid with the fracture plate are provided to solve the above-mentioned technical problems. UTILITY MODEL CONTENTS

[0005] The utility model provides a kind of fracture plate and the downhole leakage evaluation device for drilling fluid with the fracture plate, solve the problems in prior art.

[0006] The technical scheme of the utility model is as follows: a fracture plate, the fracture plate includes a plate body, the plate body is provided with a channel, the channel penetrates the plate body, the plate body includes a top surface and a bottom surface, two ports of the channel are located on the top surface and the bottom surface respectively, among the two ports, the port located on the top surface is greater than the port located on the bottom surface.

[0007] As a preferred embodiment, the plate body is circular, and the channels are provided at least two on the plate body.

[0008] As a preferred embodiment, the channels are in the shape of quadrangular frustum, and the ports on the top surface and the bottom surface of the plate body are rectangular.

[0009] As a preferred embodiment, the channels are provided two, and the two channels are distributed in mirror symmetry on the plate body.

[0010] As a preferred embodiment, the channels are in the shape of frustum, and the ports on the top surface and the bottom surface of the plate body are circular.

[0011] As a preferred embodiment, the channels are provided four, and the four channels are uniformly distributed circumferentially on the plate body.

[0012] As a preferred embodiment, a downhole leakage evaluation device for drilling fluid is provided with the fracture plate.

[0013] As a preferred embodiment, the downhole leakage evaluation device for drilling fluid comprises a drilling fluid cup, and the fracture plate is installed in the cup body.

[0014] As a preferred embodiment, the cup body is provided with a bottom cover at the bottom and a cup cover at the top, a piston is movably installed in the cup body, the fracture plate is located between the piston and the cup cover, a gasket is installed between the fracture plate and the cup cover, and the cup cover and the bottom cover are respectively provided with a communication valve rod.

[0015] As a preferred embodiment, a space is left between the piston and the bottom cover, and the space is filled with hydraulic oil, and a space is left between the piston and the fracture plate, and the space is used to hold drilling fluid.

[0016] After the above technical scheme is adopted, the beneficial effects of the present application are as follows:

[0017] 1. More accurate simulation of formation leakage channels: The new fracture plate contains multiple irregularly shaped fracture channels, the front aperture of the fracture plate is large, the back aperture is small, and the thickness of the fracture plate is increased, which can more closely simulate the actual formation leakage channel, thereby better testing the plugging ability of the plugging agent to the leakage channel.

[0018] 2. Testing the pressure-bearing capacity of the plugging plug: The fracture plate does not directly contact the bottom of the cup cover, and the middle part is suspended, which can be used to test the pressure-bearing capacity of the plugging plug, making up for the deficiency of the existing design that cannot accurately evaluate the pressure-bearing capacity of the plugging plug, and making the experimental results more valuable. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0020] Figure 1 It is a schematic diagram of the overall structure of the embodiment 3 of the present application.

[0021] Figure 2 It is a schematic diagram of the top view structure of the embodiment 1 of the present application.

[0022] Figure 3 It is Figure 2 A-A structure section view schematic diagram in the embodiment.

[0023] Figure 4 It is a schematic diagram of the top view structure of the embodiment 2 of the present application.

[0024] Figure 5 It is Figure 4 B-B structure section view schematic diagram in the embodiment.

[0025] In the figure, 1 is a communication valve rod, 2 is a cup cover, 3 is a plate body, 4 is a cup body, 5 is a drilling fluid, 6 is a piston, 7 is a bottom cover, 8 is a cup seat, 9 is hydraulic oil, 10 is a scale line, and 11 is a gasket. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0027] Embodiment 1: a crack plate, the crack plate comprising a plate body 3, the plate body 3 being provided with a channel, the channel penetrating through the plate body 3, the plate body 3 comprising a top surface and a bottom surface, two ports of the channel being respectively located on the top surface and the bottom surface, among the two ports, the port located on the top surface being larger than the port located on the bottom surface.

[0028] As Figure 2 Figure 3 shown in the embodiment, the plate body 3 is circular, the channel is quadrangular prism shape, and the ports located on the top surface and the bottom surface of the plate body 3 are rectangular respectively.

[0029] The channel is provided with two, and the two channels are distributed in mirror image symmetry on the plate body 3.

[0030] Embodiment 2: a fracture plate, the fracture plate comprising a plate body 3, the plate body 3 being provided with a channel, the channel penetrating through the plate body 3, the plate body 3 comprising a top surface and a bottom surface, two ports of the channel being respectively located on the top surface and the bottom surface, among the two ports, the port located on the top surface is larger than the port located on the bottom surface.

[0031] As shown in Figure 4 , Figure 5 , in the embodiment, the plate body 3 is circular, the channel is in the shape of a truncated cone, and the ports located on the top surface and the bottom surface of the plate body 3 are respectively circular.

[0032] The channel is provided with four, and the four channels are uniformly distributed in the circumferential direction of the plate body 3.

[0033] Specifically, the fracture plate contains a plurality of fractures, and the fracture shape is irregular to simulate the complex and variable loss channel in the formation. In the technical solution, the channel of the fracture plate is defined as a circular truncated cone or a truncated cone shape for ease of description. The fracture plate has larger pores on the top surface and smaller pores on the bottom surface, forming a certain pore gradient, which is closer to the pore distribution of the actual formation loss channel. At the same time, the thickness of the fracture plate is thicker than the conventional fracture plate, so as to better simulate the thickness of the actual formation loss channel and improve the accuracy of the experimental results.

[0034] Embodiment 3: as shown in Figure 1 , a downhole loss evaluation device for drilling fluid 5 is provided with the fracture plate in embodiments 1 and 2.

[0035] The downhole loss evaluation device for drilling fluid 5 comprises a drilling fluid 5 cup, and the drilling fluid 5 cup comprises a cup body, and the fracture plate is installed in the cup body.

[0036] Specifically, the inner wall of the cup body is provided with a scale line 10, and the fracture plate is located in a position corresponding to the scale line 10.

[0037] The bottom of the cup body is provided with a bottom cover 7, the top of the cup body is provided with a cup cover 2, a piston 6 is movably installed in the cup body, the fracture plate is located between the piston 6 and the cup cover 2, a gasket 11 is installed between the fracture plate and the cup cover 2, and the cup cover 2 and the bottom cover 7 are respectively provided with a communication valve rod 1.

[0038] Specifically, the bottom of the cup body is provided with a cup seat 8.

[0039] A space is left between the piston 6 and the bottom cover 7, the space is filled with hydraulic oil 9, and a space is left between the piston 6 and the fracture plate, the space is used to hold the drilling fluid 5.

[0040] The crack plate is not in direct contact with the bottom of the cup cover 2 of the drilling fluid 5, and the middle part is kept in a suspended state. A metal gasket 11 serving as a support is placed above the crack plate, the gasket 11 is close to both sides of the drilling fluid 5 cup, and the middle part of the crack plate is suspended. A filter paper is placed above the gasket 11 to prevent fine particles in the plugging slurry from blocking the communication valve rod 1 on the cup cover 2. This structural design makes the pressure directly act on the plugging plug during the experiment when the plugging agent forms a plugging plug at the crack plate, instead of being transmitted through the bottom of the cup cover 2, so that the pressure-bearing capacity of the plugging plug can be accurately tested.

[0041] Working process: During the experiment, first, install the piston 6 in the drilling fluid 5 cup and add a small amount of hydraulic oil 9. Then, tighten the bottom cover 7 and the communication valve rod 1 on the bottom cover 7. Then, invert the drilling fluid 5 cup, and pour the plugging slurry into the drilling fluid 5 cup at the marked line on the other side. Place the crack plate to the specified position, put the metal gasket 11 on the crack plate, and then put the filter paper on the metal gasket 11. Finally, tighten the cup cover 2 and the communication valve rod 1, and start the experiment. If the plugging agent is properly used, a plugging plug will be formed at the crack plate. Continue to pressurize to verify the pressure-bearing capacity of the plugging plug. After the experiment is completed, remove the crack plate and observe the plugging condition of the plugging agent to the crack passage, so as to evaluate the plugging effect of the plugging material.

[0042] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A split board, characterized in that, The crack plate comprises a plate body (3) provided with a channel penetrating through the plate body (3), the plate body (3) comprises a top surface and a bottom surface, and two ports of the channel are respectively located on the top surface and the bottom surface, wherein the port located on the top surface is larger than the port located on the bottom surface.

2. A split plate according to claim 1, wherein The plate body (3) is circular, and the channel is provided with at least two on the plate body (3).

3. A split plate according to claim 2, wherein, The channel is in the shape of a quadrangular frustum, and the ports located on the top surface and the bottom surface are respectively in the shape of a rectangle.

4. A split plate according to claim 3, wherein, The channel is provided with two, and the two channels are distributed in mirror symmetry on the plate body (3).

5. A split plate according to claim 2, wherein, The channel is in the shape of a frustum, and the ports located on the top surface and the bottom surface are respectively in the shape of a circle.

6. A split plate according to claim 5, wherein, The channel is provided with four, and the four channels are uniformly distributed in the circumferential direction of the plate body (3).

7. A downhole lost circulation evaluation device for drilling fluids, characterized by, A crack plate as claimed in any one of claims 1 to 5 is installed.

8. The downhole lost circulation evaluation device for drilling fluids of claim 7, wherein, The downhole leakage evaluation device for drilling fluid comprises a drilling fluid cup, and the drilling fluid cup comprises a cup body (4), and the crack plate is installed in the cup body (4).

9. The downhole lost circulation evaluation device for drilling fluids of claim 8, wherein, A bottom cover (7) is installed at the bottom of the cup body (4), a cup cover (2) is installed at the top of the cup body (4), a piston (6) is movably installed in the cup body (4), the crack plate is located between the piston (6) and the cup cover (2), a gasket (11) is installed between the crack plate and the cup cover (2), and the cup cover (2) and the bottom cover (7) are respectively provided with a communication valve rod (1).

10. The downhole lost circulation evaluation device for drilling fluids of claim 9, wherein, A space is left between the piston (6) and the bottom cover (7), and the space is filled with hydraulic oil (9), and a space is left between the piston (6) and the crack plate, and the space is used for containing drilling fluid (5).

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