Oil-based drilling fluid plugging device

Abstract

The utility model discloses an oil-based drilling fluid leaking stoppage device, which belongs to the technical field of drilling fluid leaking stoppage, aims at solving the problems that a self-locking function cannot be realized and a leaking stoppage agent filling channel cannot be automatically closed and opened, and comprises a leaking stoppage head, an upper positioning block and a lower positioning block, a leaking stoppage mechanism is arranged on the upper portion of the lower positioning block through a mounting groove, and the leaking stoppage mechanism is further connected with the upper positioning block and arranged in the leaking stoppage cavity; according to the plugging device, the plugging mechanism is arranged between the upper positioning block and the lower positioning block, so that the plugging mechanism is opened when a plugging agent passes through the liquid inlet, the plugging agent flows in the liquid outlet through the plugging cavity, the plugging agent is injected, and when the plugging agent is not injected, the plugging agent is stopped from flowing out of the liquid outlet. And the plugging mechanism is used for plugging the liquid inlet and the liquid outlet, so that the plugging agent filling channel is automatically closed and opened while backflow of the plugging agent is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of drilling fluid plugging, and particularly relates to an oil-based drilling fluid plugging device. BACKGROUND

[0002] Oil-based drilling fluid, also known as oil-based mud, is composed of oil, water, organic clay and oil-soluble chemical additives. During drilling, complex formations such as loose and broken formations, karst caves and fractured formations may be encountered, which often result in severe loss of drilling fluid, making it difficult to maintain normal circulation and drilling. When drilling through pressurized water formations or oil and gas formations, water or gas in the formation may enter the borehole, causing water and gas gushing accidents and changing the properties of the mud, which poses a safety hazard. In order to avoid accidents during drilling, plugging agents need to be injected into the downhole through a plugging tool.

[0003] In existing plugging devices, the plugging agent is injected through a bypass hole, and the liquid inlet of the plugging agent is injected horizontally, which has a large flow resistance and cannot flow directly and smoothly into the downhole for filling and injection. In addition, when the amount of filling fluid reaches the usage amount, the plugging device cannot achieve self-locking function to automatically close and open the plugging agent filling channel.

[0004] Therefore, there is a need for an oil-based drilling fluid plugging device to solve the problem of not being able to achieve self-locking function and automatically closing and opening the plugging agent filling channel in the prior art. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide an oil-based drilling fluid plugging device to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an oil-based drilling fluid plugging device, comprising a plugging head, an upper positioning block and a lower positioning block, the upper positioning block is rotatably installed at the top of the plugging head, the lower positioning block is fixedly installed at the bottom of the plugging head, a plugging chamber is arranged between the upper positioning block and the lower positioning block inside the plugging head, a liquid inlet is formed through the upper positioning block, a liquid outlet is formed through the lower positioning block, an installation groove is formed in the lower positioning block, a plugging mechanism is arranged on the upper part of the lower positioning block through the installation groove, and the plugging mechanism is connected with the upper positioning block and arranged in the plugging chamber.

[0007] It should be noted in the scheme that a plurality of liquid inlets are uniformly formed in the upper positioning block, the liquid inlets are formed as inclined grooves in the upper positioning block, and the plurality of liquid inlets are arranged around the center of the upper positioning block.

[0008] It is further worth mentioning that the liquid outlet is provided with a plurality of openings on the lower positioning block, and the plurality of liquid outlets are arranged on the lower positioning block outside the mounting groove.

[0009] It is further worth mentioning that the plugging mechanism comprises a connecting rod, the connecting rod is fixedly connected to the lower positioning block and arranged in the mounting groove, the top of the connecting rod is fixedly connected with a limiting ring, the limiting ring is provided with a matching limiting groove on the upper portion of the upper positioning block, a connecting cylinder is fixedly connected to the bottom of the upper positioning block below the limiting groove, a limiting rod is fixedly connected to the surface of the connecting cylinder, a sleeve is movably arranged outside the connecting cylinder, an adjusting groove is formed in the inner surface of the sleeve corresponding to the limiting rod, a fixed ring is fixedly connected to the bottom of the sleeve outside, a spring is fixedly connected to the bottom of the fixed ring, and a pressure bearing plate is fixedly connected to the top of the sleeve outside.

[0010] As a preferred embodiment, the limiting rod is provided with two outside the connecting cylinder, and the two limiting rods are symmetrically arranged, and the connecting cylinder is rotatably arranged between the connecting rod and the sleeve through the limiting rod.

[0011] As a preferred embodiment, the adjusting groove is arranged in an arc-shaped groove.

[0012] As a preferred embodiment, the top of the pressure bearing plate is arranged in an arc-shaped convex surface, and arranged below the liquid inlet, and the outer periphery of the pressure bearing plate is arranged in abutment with the outer periphery of the bottom of the upper positioning block.

[0013] As a preferred embodiment, the sleeve is elastically mounted in the mounting groove through the fixed ring and the spring.

[0014] Compared with the prior art, the oil-based drilling fluid plugging device provided by the utility model has at least the following beneficial effects:

[0015] The plugging mechanism arranged between the upper positioning block and the lower positioning block can open the plugging mechanism when the plugging agent passes through the liquid inlet, so that the plugging agent passes through the plugging chamber and flows in the liquid outlet, thereby realizing the injection of the plugging agent, and when the plugging agent is not injected, the plugging mechanism forms a seal between the liquid inlet and the liquid outlet, avoids the backflow of the plugging agent, and automatically realizes the sealing and opening of the filling channel of the plugging agent. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0017] Figure 2 It is an internal structure schematic view of the utility model;

[0018] Figure 3 It is a split structure schematic view of the utility model;

[0019] Figure 4 The partial disassembly structure schematic view of the utility model.

[0020] In the figure: 1, the leaking stop head; 2, upper locating block; 201, liquid inlet; 3, lower locating block; 301, liquid outlet; 302, mounting groove; 4, leaking stop chamber; 5, leaking stop mechanism; 501, connecting rod; 502, limiting ring; 503, limiting groove; 504, connecting cylinder; 505, limiting rod; 506, sleeve; 507, pressure-bearing plate; 508, fixing ring; 509, spring; 5010, adjusting groove. DETAILED DESCRIPTION

[0021] The utility model is further described below in combination with examples.

[0022] Please refer to Figures 1-4 The utility model provides a kind of oil-based drilling fluid leaking stop device, including leaking stop head 1, upper locating block 2 and lower locating block 3, upper locating block 2 is rotatably installed in the top of leaking stop head 1, lower locating block 3 is fixedly installed in the bottom of leaking stop head 1, leaking stop chamber 4 is arranged between upper locating block 2 and lower locating block 3 in the inside of leaking stop head 1, liquid inlet 201 is opened in upper locating block 2, multiple are evenly opened in upper locating block 2 in liquid inlet 201, liquid inlet 201 is opened in the inclined chute in upper locating block 2, multiple liquid inlets 201 are rotatably arranged around the center of upper locating block 2 in upper locating block 2, liquid outlet 301 is opened in lower locating block 3, multiple are opened in lower locating block 3 in liquid outlet 301, multiple liquid outlets 301 are arranged on lower locating block 3 around the outside of mounting groove 302, mounting groove 302 is also opened in lower locating block 3, leaking stop mechanism 5 is arranged on the upper portion of lower locating block 3 by mounting groove 302, leaking stop mechanism 5 is also connected with upper locating block 2 and arranged in leaking stop chamber 4.

[0023] Further as Figure 2 、 Figure 3 And Figure 4As shown, worth noting is that the plugging mechanism 5 comprises a connecting rod 501 fixedly connected to the lower positioning block 3 and arranged in the mounting groove 302, the top of the connecting rod 501 is fixedly connected with a limiting ring 502, the limiting ring 502 is correspondingly provided with a matching limiting groove 503 at the upper portion of the upper positioning block 2, a connecting cylinder 504 is fixedly connected below the bottom of the upper positioning block 2, a limiting rod 505 is fixedly connected to the surface of the connecting cylinder 504, two limiting rods 505 are symmetrically arranged outside the connecting cylinder 504, the connecting cylinder 504 is rotatably arranged between the connecting rod 501 and the sleeve 506 through the limiting rod 505, the sleeve 506 is movably arranged outside the connecting cylinder 504, an adjusting groove 5010 is formed in the inner surface of the sleeve 506 corresponding to the limiting rod 505, the adjusting groove 5010 is arranged in an arc-shaped groove, a fixed ring 508 is fixedly connected to the bottom of the sleeve 506, a spring 509 is fixedly connected to the bottom of the fixed ring 508, a pressure bearing plate 507 is fixedly connected to the top of the sleeve 506, the pressure bearing plate 507 is arranged at the bottom of the upper positioning block 2 through the sleeve 506, the top of the pressure bearing plate 507 is arranged in an arc-shaped convex surface and below the liquid inlet 201, the outer periphery of the pressure bearing plate 507 is arranged in abutment with the outer periphery of the bottom of the upper positioning block 2, and the sleeve 506 is elastically mounted in the mounting groove 302 through the fixed ring 508 and the spring 509.

[0024] In use, the plugging agent enters above the pressure bearing plate 507 through the liquid inlet 201, the pressure bearing plate 507 is slid in the mounting groove 302 through the sleeve 506 and the fixed ring 508 by the plugging agent exerting pressure on the pressure bearing plate 507, and the spring 509 is extruded, so that the pressure bearing plate 507 slides into the plugging chamber 4, and then a gap is formed between the pressure bearing plate 507 and the upper positioning block 2, so that the plugging agent enters the inside of the plugging chamber 4 and is discharged through the liquid outlet 301, thereby realizing the injection work of the plugging agent.

[0025] When the plugging agent conveying stops, the pressure bearing plate 507 is not subjected to the force at this time, and slides to the bottom of the upper positioning block 2 and forms a block between the pressure bearing plate 507 and the upper positioning block 2 under the elastic force of the spring 509, thereby effectively preventing the backflow of the plugging agent, thereby improving the practicability.

[0026] The scheme has the following working process: when the device is in use, by injecting the plugging agent into the inside of the plugging head 1, at this time the plugging agent enters above the pressure bearing plate 507 through the liquid inlet 201, the plugging agent exerts pressure on the pressure bearing plate 507, so that the pressure bearing plate 507 slides in the mounting groove 302 through the sleeve 506 and the fixing ring 508, and extrudes the spring 509, so that the pressure bearing plate 507 slides into the plugging chamber 4, and then a gap is formed between the pressure bearing plate 507 and the upper positioning block 2, so that the plugging agent enters the inside of the plugging chamber 4 and flows out through the liquid outlet 301, thereby realizing the injection work of the plugging agent, and under the sliding of the sleeve 506, the adjusting groove 5010 slides, thereby driving the limiting rod 505 to slide in it, so that the connecting cylinder 504 rotates between the connecting rod 501 and the sleeve 506 through the limiting rod 505, and through the setting of the liquid inlet 201, when the plugging agent flows in it, it can drive the upper positioning block 2 to rotate, thereby ensuring the delivery efficiency of the plugging agent, when the plugging agent delivery stops, at this time the pressure bearing plate 507 is not subjected to force, under the elastic force of the spring 509, so that the pressure bearing plate 507 slides to the bottom of the upper positioning block 2 and forms a seal between the upper positioning block 2, thereby effectively preventing the backflow of the plugging agent, thereby improving its practicality.

[0027] In summary: by setting the plugging mechanism 5 between the upper positioning block 2 and the lower positioning block 3, the plugging agent can open the plugging mechanism 5 when passing through the liquid inlet 201, so that the plugging agent flows through the plugging chamber 4 in the liquid outlet 301, thereby realizing the injection work of the plugging agent, and when the plugging agent is not injected, the plugging mechanism 5 seals between the liquid inlet 201 and the liquid outlet 301, avoiding the backflow of the plugging agent while automatically realizing the closing and opening of the plugging agent filling channel.

Claims

1. An oil-based drilling fluid leak stoppage device, comprising a leak stoppage head (1), an upper positioning block (2) and a lower positioning block (3), the upper positioning block (2) being rotatably installed at the top of the leak stoppage head (1), and the lower positioning block (3) being fixedly installed at the bottom of the leak stoppage head (1), characterized in that: The upper positioning block (2) and the lower positioning block (3) are provided with a plugging chamber (4) inside the plugging head (1), a liquid inlet (201) is formed through the upper positioning block (2), a liquid outlet (301) is formed through the lower positioning block (3), an installation groove (302) is formed on the lower positioning block (3), and a plugging mechanism (5) is arranged on the upper positioning block (2) through the installation groove (302).

2. The oil-based drilling fluid loss control device of claim 1, wherein: A plurality of liquid inlets (201) are uniformly formed on the upper positioning block (2), the liquid inlets (201) are formed as inclined grooves on the upper positioning block (2), and the plurality of liquid inlets (201) are arranged around the center of the upper positioning block (2).

3. The oil-based drilling fluid loss control device of claim 2, wherein: A plurality of liquid outlets (301) are formed on the lower positioning block (3), and the plurality of liquid outlets (301) are arranged on the lower positioning block (3) outside the installation groove (302).

4. The oil-based drilling fluid loss control device of claim 3, wherein: The plugging mechanism (5) comprises a connecting rod (501), the connecting rod (501) is fixedly connected to the lower positioning block (3) and arranged in the installation groove (302), the top of the connecting rod (501) is fixedly connected to a limiting ring (502), the limiting ring (502) is correspondingly provided with a matching limiting groove (503) on the upper portion of the upper positioning block (2), a connecting cylinder (504) is fixedly connected to the bottom of the upper positioning block (2) below the limiting groove (503), a limiting rod (505) is fixedly connected to the surface of the connecting cylinder (504), a sleeve (506) is movably arranged outside the connecting cylinder (504), an adjusting groove (5010) is formed in the inner surface of the sleeve (506) corresponding to the limiting rod (505), a fixed ring (508) is fixedly connected to the bottom of the sleeve (506) outside, a spring (509) is fixedly connected to the bottom of the fixed ring (508), a pressure bearing plate (507) is fixedly connected to the top of the sleeve (506) outside, and the pressure bearing plate (507) is arranged on the bottom of the upper positioning block (2) through the sleeve (506).

5. An oil-based drilling fluid loss control device according to claim 4, wherein: The limiting rod (505) is arranged outside the connecting cylinder (504) in two, and the two limiting rods (505) are symmetrically arranged.

6. An oil-based drilling fluid loss control device according to claim 5, wherein: The adjusting groove (5010) is arranged as an arc-shaped groove.

7. An oil-based drilling fluid loss control device according to claim 6, characterized in that: The top of the pressure bearing plate (507) is arranged as an arc-shaped convex surface, and is arranged below the liquid inlet (201), and the outer periphery of the pressure bearing plate (507) is arranged in abutment with the outer periphery of the bottom of the upper positioning block (2).

8. The oil-based drilling fluid loss control device of claim 7, wherein: The sleeve (506) is elastically mounted in the installation groove (302) through the fixed ring (508) and the spring (509).

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