A device for evaluating a lost circulation slurry sealing board

Abstract

The utility model belongs to test equipment technical field especially relates to the leak stoppage slurry leak stoppage joint board experiment evaluation device. A kind of leak stoppage slurry leak stoppage joint board experiment evaluation device, including filter press, filter press is equipped with accommodating cavity, accommodating cavity;The accommodating cavity is equipped with joint board group;The total height of the joint board group≤the height of accommodating cavity;Joint board group at least includes one joint board, and 2 cuboid cracks from joint board top surface to joint board bottom surface are all set up on joint board, and 2 cuboid cracks are symmetrically distributed with joint board top surface center as center, and through cuboid crack, through flow passage is formed in accommodating cavity.The utility model can truly and effectively simulate permeability leakage, microfracture leakage and crack leakage in drilling process for the stratum with crack and microfracture development.

Description

Technical Field

[0001] This utility model belongs to the field of testing equipment technology, and in particular relates to an experimental evaluation device for sealing grout and sealing joint plates. Background Technology

[0002] Drilling is an essential part of oil extraction. Well leakage is a common problem in oil drilling, and severe leakage can even lead to wellbore abandonment and the inability to develop regional resources. The direct and indirect losses caused by well leakage amount to billions of yuan annually, seriously hindering the development of my country's oil and gas resources. In recent years, well leakage problems have frequently occurred in the Yanchang Oilfield of the Ordos Basin, accounting for more than 28% of the total number of wells drilled. This seriously affects drilling speed, increases drilling costs, and the large-scale loss of drilling mud severely pollutes the surface and formation environment, making effective development difficult in some areas.

[0003] The Ordos Basin is characterized by well-developed formation fractures and microfractures, which can easily lead to permeability loss, microfracture loss, and fracture loss during drilling. In experiments simulating formation loss plugging, conventional plugging devices are usually single devices that cannot effectively plug different fracture types; or they are too large and inconvenient to operate. Summary of the Invention

[0004] This invention proposes an experimental evaluation device for sealing grout and sealing joint plates to solve the above-mentioned technical problems.

[0005] The technical solution of this utility model is as follows:

[0006] An experimental evaluation device for sealing grout and sealing joint plates includes a filtration meter with a receiving cavity. The receiving cavity contains a joint plate assembly. The total height of the joint plate assembly is less than or equal to the height of the receiving cavity. The joint plate assembly contains at least one joint plate, and each joint plate has two cuboid cracks extending from the top surface to the bottom surface of the joint plate. The two cuboid cracks are symmetrically distributed with the center of the top surface of the joint plate as the center. A through flow channel is formed in the receiving cavity through the cuboid cracks.

[0007] When the number of seam plates in the seam plate group is greater than or equal to 2, the cross-sections of the cracks in each cuboid share the same center, and the length and width of the cracks in each cuboid decrease sequentially from top to bottom; the sum of the heights of the seam plates is consistent with the height of the receiving cavity.

[0008] When the number of seam plates in the seam plate group is 3, it includes a first seam plate, a second seam plate, and a third seam plate from top to bottom; the first seam plate includes 2 first cuboid cracks, the second seam plate includes 2 second cuboid cracks, and the third seam plate includes 2 third cuboid cracks. The length of the first cuboid crack is greater than the length of the second cuboid crack, which is greater than the length of the third cuboid crack. The width of the first seam plate is greater than the width of the second seam plate, which is greater than the width of the third seam plate. Each group of first cuboid cracks, second cuboid cracks, and third cuboid cracks forms a through flow channel.

[0009] The receiving cavity is cylindrical, and the seam plates are all cylindrical, with the top / bottom surfaces of the seam plates having the same cross-section as the receiving cavity.

[0010] The diameter of the top / bottom surface of the seam board is 60mm to 80mm.

[0011] The length of the cuboid crack is 10-20 mm and the width is 1-5 mm.

[0012] The height of the receiving cavity is 50mm, and the height of the seam plate is 10-50mm.

[0013] The technical advantages of this utility model are as follows:

[0014] This invention targets formations with fractures and microfractures, and can realistically and effectively simulate permeability loss, microfracture loss, and fracture loss during drilling. The fracture plate can be customized according to different models of leakage testers. Laboratory evaluation of the plugging effect shows that the instrument has good operability, can realistically simulate fracture loss of different fracture widths in the formation, and can accurately, quickly select better plugging slurry systems, thereby improving the success rate of plugging leaks on the spot. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of the present invention.

[0016] Figure 2 This is a side sectional view of the present invention.

[0017] Figure 3 This is a top sectional view of the utility model.

[0018] Figure labels: 1. Seam board; 2. Cuboid crack; 3. First cuboid crack; 4. Second cuboid crack; 5. Third cuboid crack. Detailed Implementation

[0019] Example 1

[0020] An experimental evaluation device for sealing grout and sealing joint plates includes a filtration meter, which has a receiving cavity. The receiving cavity contains a joint plate assembly. The total height of the joint plate assembly is less than or equal to the height of the receiving cavity. The joint plate assembly contains at least one joint plate 1. Each joint plate 1 has two cuboid cracks 2 extending from the top surface to the bottom surface of the joint plate. The two cuboid cracks 2 are symmetrically distributed with the center of the top surface of the joint plate as the center. A through flow channel is formed in the receiving cavity through the cuboid cracks 2.

[0021] The specific implementation process of this embodiment is as follows: When in use, place one or more seam plates 1 in the receiving cavity, pour the sealing slurry to be tested into the filter, and the sealing slurry to be tested flows from the through flow channel formed by the cuboid crack 2. After pressurization, the sealing performance of the sealing slurry to be tested can be tested.

[0022] When the joint plate assembly contains only one joint plate 1, the height of the joint plate 1 is the same as the height of the receiving cavity, and the sealing slurry to be tested flows out from the top surface of the joint plate 1 to the bottom surface of the joint plate through the cuboid crack 2.

[0023] When the joint plate group contains no less than one joint plate 1, the sum of the heights of the multiple joint plates 1 is consistent with the height of the receiving cavity, and the sealing grout to be tested enters from the cuboid crack 2 located at the top to the lower cuboid crack 2 and then flows out.

[0024] Example 2

[0025] Based on Embodiment 1, it further includes the following: when the number of seam plates 1 in the seam plate group is greater than or equal to 2, the cross-sections of each cuboid crack 2 are at the same center, and the length and width of each cuboid crack 2 decrease sequentially from top to bottom; the sum of the heights of the seam plates 1 is consistent with the height of the receiving cavity.

[0026] When the number of seam plates 1 in the seam plate group is 3, it includes a first seam plate 1, a second seam plate 1, and a third seam plate 1 from top to bottom; the first seam plate 1 includes 2 first cuboid cracks 3, the second seam plate 1 includes 2 second cuboid cracks 4, and the third seam plate 1 includes 2 third cuboid cracks 5. The length of the first cuboid crack 3 is greater than the length of the second cuboid crack 4, which is greater than the length of the third cuboid crack 5. The width of the first seam plate 1 is greater than the width of the second seam plate 1, which is greater than the width of the third seam plate 1. Each group of first cuboid cracks 3, second cuboid cracks 4, and third cuboid cracks 5 forms a through flow channel. It can realistically and effectively simulate the composite leakage scenario of "wide cracks-micro cracks-pores" during drilling, and thus obtain the step-like sealing process of the plugging slurry to be tested in cracks of different widths.

[0027] Example 3

[0028] Based on Embodiment 2, the further embodiment includes a cylindrical cavity, with all seam plates 1 being cylindrical, and the top / bottom surfaces of the seam plates having the same cross-section as the cavity. The diameter of the top / bottom surfaces of the seam plates is 60mm to 80mm. The length of the cuboid crack 2 is 10 to 20mm, and the width is 1 to 5mm. The height of the cavity is 50mm, and the height of the seam plates 1 is 10 to 50mm.

Claims

1. A test evaluation device for sealing grout and sealing joints, comprising a filtration meter, wherein the filtration meter has a receiving cavity; characterized in that, The cavity is provided with a set of seam plates; the total height of the set of seam plates is less than or equal to the height of the cavity; the set of seam plates includes at least one seam plate (1), and each seam plate (1) has two cuboid cracks (2) extending from the top surface of the seam plate to the bottom surface of the seam plate. The two cuboid cracks (2) are symmetrically distributed with the center of the top surface of the seam plate as the center, and a through flow channel is formed in the cavity through the cuboid cracks (2).

2. The experimental evaluation device for sealing grout and sealing joints according to claim 1, characterized in that, When the number of seam plates (1) in the seam plate group is greater than or equal to 2, the cross-sections of the cuboid cracks (2) are at the same center, and the length and width of the cuboid cracks (2) decrease sequentially from top to bottom; the sum of the heights of the seam plates (1) is consistent with the height of the receiving cavity.

3. The experimental evaluation device for sealing grout and sealing joints according to claim 2, characterized in that, When the number of seam plates (1) in the seam plate group is 3, it includes a first seam plate (1), a second seam plate (1) and a third seam plate (1) from top to bottom; the first seam plate (1) includes 2 first cuboid cracks (3), the second seam plate (1) includes 2 second cuboid cracks (4), and the third seam plate (1) includes 2 third cuboid cracks (5). The length of the first cuboid crack (3) is greater than the length of the second cuboid crack (4) and the length of the third cuboid crack (5). The width of the first seam plate (1) is greater than the width of the second seam plate (1) and the width of the third seam plate (1). Each group of first cuboid cracks (3), second cuboid cracks (4) and third cuboid cracks (5) forms a through flow channel.

4. The experimental evaluation device for sealing grout and sealing joints according to claim 3, characterized in that, The cavity is cylindrical, and the seam plates (1) are all cylindrical, with the top / bottom surfaces of the seam plates matching the cross-section of the cavity.

5. The experimental evaluation device for sealing grout and sealing joints according to claim 4, characterized in that, The diameter of the top / bottom surface of the seam board is 60mm to 80mm.

6. The experimental evaluation device for sealing grout and sealing joints according to claim 5, characterized in that, The length of the cuboid crack (2) is 10~20mm and the width is 1~5mm.

7. The experimental evaluation device for sealing grout and sealing joints according to claim 6, characterized in that, The height of the receiving cavity is 50 mm, and the height of the seam plate (1) is 10-50 mm.

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