A wellbore strengthening agent mixing mechanism for a drilling wellbore strengthening device

Abstract

This invention discloses a wellbore strengthening agent mixing mechanism for a drilling wellbore strengthening device, comprising: a mud recovery mechanism for recovering mud and transporting it to a reaction chamber mechanism; a reaction liquid delivery mechanism for transporting reaction liquid to the reaction chamber mechanism; and a reaction chamber mechanism for mixing the mud and reaction liquid and uniformly applying the mixture to the wellbore using a brush. The number of reaction chamber mechanisms is N, where N equals 4, and each reaction chamber mechanism operates independently, with each reaction chamber mechanism connected to one reaction liquid delivery mechanism. By separating the mud and reaction liquid through the reaction liquid delivery mechanism, wellbore strengthening can be controlled at any time; and by allowing multiple reaction chamber mechanisms to operate independently, comprehensive coverage of the wellbore is achieved.

Description

Technical Field

[0001] This invention relates to the fields of drilling, drilling engineering and wellbore protection technology, and in particular to a wellbore strengthening agent mixing mechanism for a drilling wellbore strengthening device. Background Technology

[0002] Self-propelled and self-directional steerable drilling technology has three main advantages: First, it eliminates the need for a drilling rig. Bottom-hole driven dual drill bits replace the rig's rotary drive, mud circulation replaces surface mud pump circulation, and a near-bit pressure regulation system replaces the rig's hook-based pressure control. Second, it eliminates dependence on drill pipe depth. Using armored cable housings as the primary transmission medium significantly reduces tripping time and wellbore disturbance. Third, the drilling system is self-propelled and self-directional. It eliminates the need for surface-based drill bit pressurization and feeding.

[0003] Similar to conventional drilling, after achieving the goal of rig-free and drill pipe-free directional drilling, wellbore stability must also be considered. First, it is necessary to identify areas of wellbore instability or instability. To address this, the inventors proposed a "self-contained continuous recording device for formation rock morphology while drilling" (patent number: CN201921263123.9), which records wellbore morphology while drilling and identifies areas of wellbore instability or instability. Second, it is necessary to reinforce these identified areas of instability or instability. However, there are currently no relevant solutions or reports, representing a gap in existing research. Therefore, a wellbore reinforcement device while drilling was invented. However, due to the use of the AB glue principle, where agent A is drilling mud and agent B is a type of adhesive... and The reaction of drilling mud produces a substance with a certain strength, which requires a place where A and B can be mixed. Therefore, it is essential to invent a wellbore strengthening agent mixing mechanism for drilling wall strengthening devices. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned in the background art and to provide a wellbore strengthening agent mixing mechanism for a drilling wellbore strengthening device.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a wellbore strengthening agent mixing mechanism for a drilling wellbore strengthening device, comprising: a mud recovery mechanism for recovering mud and transporting it to a reaction chamber mechanism;

[0007] The reaction liquid delivery mechanism is used to deliver the reaction liquid to the reaction chamber mechanism;

[0008] The reaction chamber mechanism is used to mix mud and reaction fluid, and to evenly apply the mixture to the well wall using a brush.

[0009] There are N reaction chamber mechanisms, where N equals 4. Each reaction chamber mechanism operates independently and is connected to one reaction liquid delivery mechanism.

[0010] Furthermore, the mud recovery mechanism includes recovery pipes, mud conveying pipes, and valves. The recovery pipes are located at the center of the device. There are four mud conveying pipes, arranged in two layers, with pipes in the same layer arranged symmetrically and pipes in different layers at an angle of 90°.

[0011] Furthermore, the mud conveying pipeline includes an upper pipeline and a lower pipeline. The upper pipeline is fixedly connected to the recovery pipeline, and the upper pipeline and the lower pipeline are connected by a valve.

[0012] Furthermore, the reaction liquid delivery mechanism includes a ground delivery pipeline and an injection pipeline. The ground delivery pipeline is connected to a ground reaction liquid storage tank, and the injection pipeline is fixedly connected to the reaction chamber mechanism.

[0013] Furthermore, the reaction chamber mechanism includes an air inlet, a mud inlet, a reaction liquid inlet, a stepper motor, a mixing device, a torsion motor, a threaded rod, a brush, the reaction chamber body, a distance sensor, and a baffle.

[0014] Furthermore, there are two gas inlets, symmetrically distributed on both sides of the reaction chamber body, which are fixedly connected to the gas pipeline. The mud inlet is fixedly connected to the lower pipe of the mud conveying pipeline, and the reaction liquid inlet is fixedly connected to the injection pipe of the reaction liquid conveying mechanism.

[0015] Furthermore, the stepper motor includes a stepper motor body, a central shaft, and screws. The stepper motor body is fixed to the reaction chamber body by screws and connected to the mixing device through the central shaft.

[0016] Furthermore, there are two torsion motors, which are fixed inside the isolation mechanism and fixedly connected to the threaded rods. There are two threaded rods, which are symmetrically distributed on both sides of the reaction chamber body and connected to the brushes through threaded holes.

[0017] The brush includes threaded holes and sensor holes. There are two threaded holes, symmetrically distributed on both sides of the brush. There are two distance sensors, symmetrically arranged vertically. They are fixedly connected to the brush through the sensor holes. The baffle is slidably connected to the slide groove of the reaction chamber body.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] This invention separates the mud and reaction liquid through a reaction liquid delivery mechanism, enabling controllable wellbore reinforcement at any time; and achieves full coverage of the wellbore through the independent operation of multiple reaction chamber mechanisms. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a three-dimensional schematic diagram of the wellbore reinforcement device of the present invention installed on the torque self-balancing drilling system.

[0022] Figure 2 This is a front view of the wellbore reinforcement device of the present invention installed on the torque self-balancing drilling system.

[0023] Figure 3 This is a schematic diagram of the mud recycling mechanism.

[0024] Figure 4 This is a schematic diagram of the mud conveying pipeline assembly.

[0025] Figure 5 This is a schematic diagram of the reaction liquid delivery mechanism.

[0026] Figure 6 This is a structural diagram of the reaction chamber mechanism.

[0027] Figure 7 This is a cross-sectional schematic diagram of the reaction chamber mechanism.

[0028] Figure 8 This is a schematic diagram of a stepper motor.

[0029] Figure 9 This is a structural diagram of a brush holder.

[0030] Figure 10 This is a schematic diagram showing the connection of the baffle, conveyor belt, pulley, and tensioner. Detailed Implementation

[0031] To better understand this technical solution, the method of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Referring to the accompanying drawings, this invention proposes a wellbore strengthening agent mixing mechanism for a drilling wellbore strengthening device, comprising: a mud recovery mechanism 1, a reaction fluid delivery mechanism 2, and a reaction chamber mechanism 3. Wherein:

[0033] The mud recovery mechanism 1 is used to recover and transport mud to the reaction chamber mechanism 3. It includes a recovery pipe 101, a mud conveying pipe 102 and a valve 103. The recovery pipe 101 is located at the center of the device. There are 4 mud conveying pipes 102, which are arranged in two layers. The pipes in the same layer are symmetrically arranged, and the included angle between the pipes in different layers is 90°.

[0034] Specifically, the mud conveying pipeline 102 includes an upper pipeline 10201 and a lower pipeline 10202. The upper pipeline 10201 is fixedly connected to the recovery pipeline 101, and the upper pipeline 10201 and the lower pipeline 10202 are connected by a valve 103.

[0035] The reaction liquid delivery mechanism 2 is used to deliver the reaction liquid to the reaction chamber mechanism 3. It includes a ground delivery pipe 201 and an injection pipe 202. The ground delivery pipe 201 is connected to the ground reaction liquid storage tank, and the injection pipe 202 is fixedly connected to the reaction chamber mechanism 3.

[0036] The reaction chamber mechanism 3 is used to mix mud and reaction liquid, and to evenly apply the mixture to the well wall by brush 308. It includes a gas inlet 301, a mud inlet 302, a reaction liquid inlet 303, a stepper motor 304, a mixing device 305, a torsion motor 306, a threaded rod 307, a brush 308, a reaction chamber body 309, a distance sensor 3010, and a baffle 3011.

[0037] Specifically, there are two gas inlets 301, which are symmetrically distributed on both sides of the reaction chamber body 309. The gas inlets 301 are fixedly connected to the gas pipeline 402, the mud inlet 302 is fixedly connected to the lower pipeline 10202, and the reaction liquid inlet 303 is fixedly connected to the injection pipeline 202.

[0038] The stepper motor 304 includes a stepper motor body 30401, a central shaft 30402, and screws 30403. The stepper motor body 30401 is fixed to the reaction chamber body 309 by the screws 30403 and is connected to the mixing device 305 by the central shaft 30402.

[0039] Two torsion motors 306 are fixed inside the isolation mechanism and are fixedly connected to threaded rods 307. There are two threaded rods 307, which are symmetrically distributed on both sides of the reaction chamber body 309 and are connected to the brush 308 through threaded holes 30801.

[0040] The brush 308 includes two threaded holes 30801 and two sensor holes 30802. There are two threaded holes 30801, which are symmetrically distributed on both sides of the brush 308. There are two distance sensors 3010, which are symmetrically arranged vertically. They are fixedly connected to the brush 308 through the sensor holes 30802. The baffle 3011 is slidably connected to the slide groove of the reaction chamber body 309. Specifically, a rack is fixedly connected to the baffle 3011. The drive motor is fixedly connected to the reaction chamber body 309, and the gear at the output end of the drive motor meshes with the rack. The drive motor drives the gear to rotate, thereby moving the rack and thus sliding the baffle 3011.

[0041] The method of moving the baffle 1011 can also be found in [reference]. Figure 10 That is, the baffle 1011 is fixedly connected to the conveyor belt 301102, the pulley 301104 is rotatably installed inside the reaction chamber body 309 and the conveyor belt 301102 is sleeved on the outside of the pulley 301104, the rotation of the pulley 301104 is driven by the drive motor, and the tension wheel 301103 is set on the side edge of the conveyor belt 301102 to adjust the tension of the conveyor belt 301102.

[0042] Furthermore, there are four reaction liquid delivery mechanisms 2, distributed at 90° intervals around the recovery pipe 101, and four reaction chamber mechanisms 3, symmetrically distributed in two layers, two on each side.

[0043] Working principle and usage of this invention:

[0044] After receiving the signal, the mud recovery device 1 opens the valve 103, and the mud enters the reaction chamber mechanism 3 through the mud conveying pipe 102. The reaction liquid is injected into the reaction chamber 3 from the ground storage tank through the reaction liquid conveying mechanism 2. The stepper motor 304 drives the mixing device 305 to mix the mud and the reaction liquid. The air chamber mechanism 4 delivers a small amount of gas to the reaction chamber mechanism 3 through the gas pipe to promote the full mixing of the mud and the reaction liquid and form a preliminary mixture.

[0045] Upon reaching the damaged rock strata, the device hovers with the help of the continuous recording device for the formation rock morphology while drilling in the torque self-balancing drilling system. The baffle 3011 is opened, and the mixture is sprayed from the reaction chamber body 309 onto the well wall. The twisting motor 306 drives the threaded rod 307 to rotate, causing the brush 308 to move vertically. After the distance sensor 3010 contacts the mud isolation mechanism 5, the twisting motor 306 rotates in the opposite direction, realizing the repeated vertical movement of the brush 308, and evenly coating the mixture onto the well wall.

Claims

1. A wellbore strengthening agent mixing mechanism for a drilling wellbore strengthening device, characterized in that, include: A mud recovery mechanism (1) is used to recover mud and transport it to the reaction chamber mechanism (3). The reaction liquid delivery mechanism (2) is used to deliver the reaction liquid to the reaction chamber mechanism (3). The reaction chamber mechanism (3) is used to mix the mud and the reaction liquid, and to apply the mixture evenly to the well wall by means of a brush (308); The number of reaction chamber mechanisms (3) is N, where N equals 4. Each reaction chamber mechanism (3) operates independently and is connected to one reaction liquid delivery mechanism (2). The mud recovery mechanism (1) includes a recovery pipe (101), a mud conveying pipe (102) and a valve (103). The recovery pipe (101) is located at the center of the device. There are four mud conveying pipes (102), which are arranged in two layers. The pipes in the same layer are symmetrically arranged, and the angle between the pipes in different layers is 90°. The reaction chamber mechanism (3) includes an air inlet (301), a mud inlet (302), a reaction liquid inlet (303), a stepper motor (304), a mixing device (305), a torsion motor (306), a threaded rod (307), a hanging brush (308), a reaction chamber body (309), a distance sensor (3010), and a baffle (3011). There are two gas inlets (301), which are symmetrically distributed on both sides of the reaction chamber body (309) and are fixedly connected to the gas pipeline (402). The mud inlet (302) is fixedly connected to the lower pipe (10202) of the mud conveying pipeline (102). The reaction liquid inlet (303) is fixedly connected to the injection pipe (202) of the reaction liquid conveying mechanism (2). The stepper motor (304) includes a stepper motor body (30401), a central shaft (30402) and screws (30403). The stepper motor body (30401) is fixed to the reaction chamber body (309) by screws (30403) and connected to the mixing device (305) by the central shaft (30402). There are two torsion motors (306), which are fixed inside the isolation mechanism and fixedly connected to the threaded rods (307); there are two threaded rods (307), which are symmetrically distributed on both sides of the reaction chamber body (309) and connected to the hanging brushes (308) through threaded holes (30801); The brush (308) includes a threaded hole (30801) and a sensor hole (30802). There are two threaded holes (30801), which are symmetrically distributed on both sides of the brush (308). There are two distance sensors (3010), which are symmetrically arranged vertically and are fixedly connected to the brush (308) through the sensor hole (30802). The baffle (3011) is slidably connected in the groove of the reaction chamber body (309).

2. The wellbore strengthening agent mixing mechanism of the wellbore strengthening device according to claim 1, characterized in that, The mud conveying pipeline (102) includes an upper pipeline (10201) and a lower pipeline (10202). The upper pipeline (10201) is fixedly connected to the recovery pipeline (101), and the upper pipeline (10201) and the lower pipeline (10202) are connected by a valve (103).

3. The wellbore strengthening agent mixing mechanism of the wellbore strengthening device according to claim 1, characterized in that, The reaction liquid delivery mechanism (2) includes a ground delivery pipe (201) and an injection pipe (202). The ground delivery pipe (201) is connected to the ground reaction liquid storage tank, and the injection pipe (202) is fixedly connected to the reaction chamber mechanism (3).

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