A spherical valve structure of a drilling plugging pump

Abstract

The present application relates to the technical field of drilling plugging pump, especially to a spherical valve structure of drilling plugging pump, and relates to the technical problem that in the actual plugging operation process, when the plugging slurry with large particles, high solid phase and large viscosity passes through the liquid end of the pump, the valve of the liquid end is often blocked, the valve cannot be closed tightly or cannot be closed, the pressure cannot be formed in the valve box of the pump, and the plugging operation cannot be implemented; the technical scheme is a spherical valve structure of drilling plugging pump, which comprises a valve box, a spherical valve core, a conical valve seat, a non-metal sealing ring, a guide support, a limiting support, a first valve cover and a second valve cover; the present application increases the opening gap size of the suction valve and the discharge valve, changes the contact mode of the valve core and the valve seat, reduces the contact area between them, improves the passing property of the valve body valve for large-size particles, makes the valve core and the valve seat fit more closely, avoids the problem of valve blockage or poor closure, and ensures the normal operation of the liquid end of the plugging pump.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling plugging pumps, and particularly to a spherical valve structure of a drilling plugging pump. Background Art

[0002] During normal drilling operations, accidents such as underground wellbore collapse, jamming or well leakage often occur; it is necessary to promptly inject plugging agent mud containing large-sized solid particles into the corresponding well section underground to seal the wellbore cracks, prevent mud loss and wellbore collapse, and ensure the normal progress of drilling operations; during this process, high requirements are imposed on the drilling mud pump, solids control system and performance of the plugging mud; it is required that the mud pump or special plugging pump can quickly inject plugging slurry, bridging slurry, gel, pipe release agent, high-water-loss plugging slurry, etc. with large-sized particles, high solid content, high density and high viscosity into the well. At present, during actual plugging operations, ordinary mud pumps or plunger pumps supporting the main body of the drilling rig are often used to inject the plugging agent; due to the limitation of the valve structure at the hydraulic end of such pumps, when plugging slurry with large particles, high solids and high viscosity passes through the hydraulic end of the pump, the valve at the hydraulic end often gets jammed, the valve cannot be closed tightly or cannot be closed at all, pressure cannot be formed in the pump valve box, and the hydraulic end of the pump cannot suck in and discharge the mud, resulting in the inability to carry out the plugging operation. To solve such pump jamming problems, a spherical valve structure of "spherical valve core + conical valve seat" has been proposed; this spherical valve assembly is installed as the suction valve and discharge valve inside the hydraulic end of the mud pump or special plugging pump. By changing the contact mode between the valve core and the valve seat, the contact area between the valve core and the valve seat is reduced, the opening height of the spherical valve core is optimized, and the particle passing performance of the suction valve and discharge valve is effectively improved; and a polyurethane (or nylon) sealing ring with high elasticity and high abrasion resistance is arranged inside the valve seat, which can not only increase the sealing performance, prevent loose closure, but also delay wear and impact, avoid damage to the sealing ring and valve body, and effectively extend the life of the rubber sealing parts, enabling the hydraulic end of the drilling mud pump to fully adapt to the passage of plugging agent mud with large particles and high solids, and completely solving problems such as jamming and leakage during on-site plugging operations. Summary of the Invention

[0003] In order to overcome the problem that in the actual plugging operation process of the prior art, ordinary mud pumps or plunger pumps supporting the main body of the drilling rig are often used to inject the plugging agent. Due to the limitation of the valve structure at the hydraulic end of such pumps, when plugging slurry with large particles, high solids and high viscosity passes through the hydraulic end of the pump, the valve at the hydraulic end often gets jammed, the valve cannot be closed tightly or cannot be closed at all, pressure cannot be formed in the pump valve box, and the hydraulic end of the pump cannot suck in and discharge the mud, resulting in the inability to carry out the plugging operation.

[0004] The technical solution of the present invention is as follows: a spherical valve structure for a drilling plugging pump, comprising a valve box, a spherical valve core, a conical valve seat, a non-metallic sealing ring, a guide bracket, a limiting support, a first valve cover, and a second valve cover; a conical valve seat is provided on the inner side of the valve box, a spherical valve core is provided above the conical valve seat, a non-metallic sealing ring is provided on the outer side of the spherical valve core, a guide bracket is provided on the outer side of the spherical valve core, a limiting support is provided above the guide bracket, a first valve cover is provided on the inner side of the valve box, and a second valve cover is provided on the inner side of the valve box.

[0005] Preferably, the spherical valve core rests on the conical valve seat under gravity, and the non-metallic sealing ring is in an elastic deformation state, forming a tight contact with the spherical valve core to ensure the initial sealing of the valve. When the plugging pump starts working, the slurry is drawn into the pump's hydraulic end. Under the negative pressure and the impact of the slurry, the spherical valve core of the suction valve overcomes gravity and floats upward along the guide support, thus opening the valve. At this time, the opening height is large enough to allow large-sized slurry particles to pass through smoothly. The slurry enters the valve box cavity through the opened valve, and then, under the pressure of the pump, the slurry is pushed towards the discharge valve. At the discharge valve, the slurry pressure increases, pushing... The spherical valve core floats upward, opening the discharge valve and allowing the slurry to be discharged from the pump. Once the slurry is discharged, the pump pressure decreases, and the spherical valve core of the discharge valve falls back under gravity, re-establishing tight contact with the inner conical surface of the conical valve seat, thus closing the valve. This invention increases the opening gap between the suction valve and the discharge valve, changes the contact method between the valve core and the valve seat, reduces the contact area between them, improves the valve body valve's ability to pass through large particles, and makes the valve core and valve seat fit more tightly, avoiding valve jamming or incomplete closure, thus ensuring pressure formation and normal operation of the plugging pump's hydraulic end.

[0006] Preferably, the spherical valve core has a hollow metal structure. The spherical valve core is used to control the weight of the valve core to ensure that the valve core opens smoothly and falls back quickly, and to ensure the opening height and the falling speed of the valve core. The outer surface of the spherical valve core is spherical, which forms line contact with the inner conical surface of the conical valve seat.

[0007] Preferably, the conical valve seat has an inner and outer conical structure. The inner conical surface of the conical valve seat is used to contact the spherical valve core, and the outer conical surface is used to contact the inner wall of the valve box to ensure the stable installation of the valve seat in the valve box. The inner conical surface of the conical valve seat is inlaid with a non-metallic sealing ring, which is made of highly elastic and high wear-resistant polyurethane and nylon materials.

[0008] Preferably, the contact surface between the non-metallic sealing ring and the spherical valve core is approximately line contact.

[0009] Preferably, the guide bracket has a cylindrical structure, and the inner side of the guide bracket is provided with a guide groove that cooperates with the ball valve core.

[0010] Preferably, the limiting support is positioned above the guide bracket to limit the floating range of the ball valve core.

[0011] Preferably, the first valve cover and the second valve cover are provided with channels that communicate with the interior of the valve box.

[0012] Preferably, the valve box has a cylindrical structure, and the inner wall of the valve box fits with the outer conical surface of the conical valve seat to fix the valve seat and withstand the pressure of the mud.

[0013] Preferably, the valve box has a connecting flange interface structure on the outside for connecting to the hydraulic end of the plugging pump.

[0014] Preferably, the specific operating steps of this drilling plugging pump spherical valve structure include: S1: In the initial state, the spherical valve core is located on the conical valve seat under the action of gravity, and the non-metallic sealing ring is in an elastic deformation state, forming a tight contact with the spherical valve core to ensure the initial sealing of the valve; S2: When the plugging pump starts working, when the mud is sucked into the hydraulic end of the pump, the ball valve core of the suction valve overcomes gravity under the negative pressure and the impact of the mud, and floats upward along the guide support to open the valve; at this time, the opening height is large enough to allow large mud particles to pass through smoothly, so that large mud particles can smoothly enter the hydraulic end box cavity. S3: When the mud is discharged, the spherical valve core of the suction valve falls back to the valve seat under the action of positive pressure and gravity in the valve box cavity, and fits with the non-metallic (polyurethane or nylon) sealing ring on the conical surface of the valve seat, thus closing the valve box; at the same time, the spherical valve core of the discharge valve overcomes gravity and floats upward along the guide support under the action of the mud positive pressure, thus opening the valve, so that the large-sized mud particles are squeezed out of the hydraulic end valve box cavity.

[0015] The beneficial effects of this invention are: 1. By adopting a hollow metal spherical valve core, the contact method between the valve core and the valve seat of the traditional valve valve is changed, reducing the contact area between the valve core and the inner conical surface of the valve seat; the valve core spring mechanism is removed, allowing the valve core to rotate freely; polyurethane and nylon sealing rings are arranged on the inner conical surface of the valve seat to provide buffering and sealing; and the opening gap between the valve core and the valve seat is increased; this allows high-solids, large-particle mud to pass through the valve valve, effectively reducing the probability of large-particle jamming and sealing ring leakage; it makes the valve core and valve seat fit more tightly, avoiding valve jamming or incomplete closure, ensuring pressure formation and normal operation of the hydraulic end of the plugging pump, especially suitable for drilling plugging operations, and can meet the rapid injection of plugging slurries, bridging slurries, gels, unblocking agents, and high-water-loss plugging slurries with large-particle, high-solids content, high density, and high viscosity into the well. Attached Figure Description

[0016] Figure 1The diagram shown is a cross-sectional view of the spherical valve structure of the drilling plugging pump of the present invention. Figure 2 The diagram shown is a schematic diagram of the first valve seat structure of the spherical valve structure of the drilling plugging pump of the present invention; Figure 3 The diagram shown is a schematic of the second valve seat structure of the spherical valve structure of the drilling plugging pump of the present invention. Figure 4 The diagram shown is a schematic representation of the spherical valve structure sealing ring of the drilling plugging pump of the present invention. Figure 5 The diagram shown illustrates the working steps of the spherical valve structure of the drilling plugging pump of the present invention. Explanation of reference numerals in the attached drawings: 1. Spherical valve core; 2. Conical valve seat; 3. Non-metallic sealing ring; 4. Guide bracket; 5. Limiting support; 6. First valve cover; 7. Second valve cover; 8. Valve box. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Please see Figure 1-2 The present invention provides an embodiment of a drilling plugging pump spherical valve structure, comprising a valve box 8, a spherical valve core 1, a conical valve seat 2, a non-metallic sealing ring 3, a guide bracket 4, a limiting support 5, a first valve cover 6, and a second valve cover 7; the conical valve seat 2 is provided on the inner side of the valve box 8, the spherical valve core 1 is provided above the conical valve seat 2, the non-metallic sealing ring 3 is provided on the outer side of the spherical valve core 1, the guide bracket 4 is provided on the outer side of the spherical valve core 1, the limiting support 5 is provided above the guide bracket 4, the first valve cover 6 is provided on the inner side of the valve box 8, and the second valve cover 7 is provided on the inner side of the valve box 8.

[0019] Please see Figure 3-5In this embodiment, the spherical valve core 1 is a hollow metal structure. The spherical valve core 1 is used to control its weight to ensure smooth opening and rapid retraction, and to guarantee the opening height and retraction speed of the valve core 1. The outer surface of the spherical valve core 1 is spherical, forming a line contact with the inner conical surface of the conical valve seat 2. This reduces the contact area between the valve core and the valve seat, improving the valve's throughput and sealing performance. The conical valve seat 2 has an inner and outer conical structure. The inner conical surface of the conical valve seat 2 contacts the spherical valve core 1, and the outer conical surface contacts the inner wall of the valve box 8, ensuring... To ensure stable installation of the valve seat within the valve box 8, a non-metallic sealing ring 3 is embedded in the inner conical surface of the conical valve seat 2. This non-metallic sealing ring 3 is made of highly elastic, high-wear-resistant polyurethane and nylon materials. It buffers the collision between the spherical valve core 1 and the inner conical surface of the valve seat 2, preventing damage from the collision, and also provides strong sealing performance. Especially when handling mud containing large particles, the non-metallic sealing ring 3 can have good contact with the spherical valve core 1 and can encapsulate the particles, ensuring a valve seal and preventing gasket jamming and leakage. The contact surface between the sealing ring 3 and the spherical valve core 1 is approximately line contact. This structure changes the contact mode between the spherical valve core 1 and the non-metallic sealing ring 3. Initially, the contact between the spherical outer surface of the valve core 1 and the inner conical surface of the non-metallic sealing ring 3 is line contact. Under the action of the elastic deformation of the conical non-metallic sealing ring, the actual contact surface is a small planar contact, which can greatly reduce the contact area between the valve core 1 and the non-metallic sealing ring 3, and prevent mud particles from getting stuck on the contact surface between the valve core 1 and the non-metallic sealing ring 3. Under the action of the elastic deformation of the sealing ring, the actual contact surface is a small planar contact. The guide bracket 4 forms a tight contact and wraps around the ball valve core 1 to ensure the valve's sealing performance and prevent mud particles from getting stuck between the valve core and the valve seat. The guide bracket 4 has a cylindrical structure and a guide groove that matches the ball valve core 1 on its inner side. This groove guides the movement of the ball valve core 1 during its up-and-down floating process, ensuring that the valve core can open and close stably. The limit support 5 is located above the guide bracket 4 to limit the floating range of the ball valve core 1, preventing the valve core from opening or closing excessively, thereby protecting the valve structure from damage.

[0020] The first valve cover 6 and the second valve cover 7 are provided with channels communicating with the inside of the valve box 8 for the inflow and outflow of mud. The valve box 8 is a cylindrical structure. The inner wall of the valve box 8 fits with the outer conical surface of the conical valve seat 2 to fix the valve seat and withstand the pressure of the mud. The outer side of the valve box 8 has a connecting flange interface structure for connecting with the hydraulic end of the plugging pump. By removing the limiting spring structure in the traditional valve, since the ball valve core 1 in the valve does not have the limiting spring structure to restrain it, the metal ball valve core 1 can rotate freely under the action of mud flow. When the plugging mud passes through the gap between the ball valve core 1 and the conical valve seat 2, the ball valve core 1 can roll down to the non-metallic sealing ring 3 on the conical surface inside the conical valve seat 2, which helps to push larger particles out and avoid jamming. The specific working steps of this drilling plugging pump with its spherical valve structure include: S1: In the initial state, the spherical valve core is located on the conical valve seat under the action of gravity, and the non-metallic sealing ring is in an elastic deformation state, forming a tight contact with the spherical valve core to ensure the initial sealing of the valve; S2: When the plugging pump starts working, when the mud is sucked into the hydraulic end of the pump, the ball valve core of the suction valve overcomes gravity under the negative pressure and the impact of the mud, and floats upward along the guide bracket to open the valve; at this time, the opening height is large enough to allow large mud particles to pass through smoothly, so that large mud particles can smoothly enter the hydraulic end box 8 chamber. S3: When the mud is discharged, the spherical valve core 1 of the suction valve falls back to the valve seat 2 under the action of positive pressure and gravity in the valve box 8 cavity, and fits with the non-metallic polyurethane or nylon sealing ring 3 on the valve seat cone surface, thereby closing the valve box 8; at the same time, the spherical valve core 1 of the discharge valve overcomes gravity and floats upward along the guide bracket 4 under the action of the mud positive pressure, thereby opening the valve and squeezing out the large-sized mud particles from the hydraulic end valve box 8 cavity.

[0021] During operation, the spherical valve core 1 is positioned on the conical valve seat 2 under the action of gravity, and the non-metallic sealing ring 3 is in an elastic deformation state, forming a tight contact with the spherical valve core 1 to ensure the initial sealing of the valve; at this time, mud cannot pass through the valve. When the plugging pump starts working, the mud is sucked into the pump's hydraulic end; under the negative pressure and the impact of the mud, the ball valve core 1 of the suction valve overcomes gravity and the elasticity of the non-metallic sealing ring 3, and floats upward along the guide bracket 4 to open the valve; at this time, the opening height is large enough to allow large mud particles to pass through smoothly. The mud enters the valve box 8 chamber through the open suction valve, and then is pushed towards the discharge valve under the pressure of the pump. At the discharge valve, the mud pressure increases, pushing the ball valve core 1 to float upward, opening the discharge valve, and the mud is discharged out of the pump through the valve. After the mud is discharged, the pressure inside the pump decreases; the spherical valve core 1 falls back under the action of gravity and re-establishes tight contact with the inner conical surface of the conical valve seat 2, and the valve closes; at this time, the valve returns to its initial state and waits for the next working cycle. Through the above steps, by using a hollow metal spherical valve core 1, the contact method between the valve core and the valve seat of the traditional valve valve is changed, reducing the contact area between the valve core and the inner conical surface of the valve seat; the valve core spring mechanism is removed, allowing the valve core to rotate freely; polyurethane and nylon sealing rings are arranged on the inner conical surface of the valve seat to provide buffering and sealing; and the opening gap between the valve core and the valve seat is increased; this allows the valve to be used for drilling mud with high solids and large particle size, effectively reducing the probability of large particle jamming and sealing ring leakage; it makes the valve core and valve seat fit more tightly, avoiding valve jamming or incomplete closure, ensuring the pressure formation and normal operation of the plugging pump's hydraulic end, especially suitable for drilling plugging operations, and can meet the rapid injection of plugging slurries, bridging slurries, gels, unblocking agents, and high-water-loss plugging slurries with large particles, high solids content, high density, and high viscosity into the well.

[0022] Example 1 Optionally, during oil drilling, it is necessary to inject plugging mud containing large solid particles into the well in a timely manner. However, the existing technology uses a traditional mud pump for plugging mud injection. The structure of the valve at the hydraulic end of the mud pump is limited, which causes large mud particles to get stuck when passing through. The valve does not close tightly, and pressure cannot be formed in the pump valve box 8, so the mud cannot be injected smoothly into the well. The drilling plugging pump of this invention utilizes a spherical valve structure. The spherical valve core 1 and the conical valve seat 2 are in line contact, reducing the contact area and improving flowability. A non-metallic sealing ring 3 enhances sealing, preventing jamming and leakage. In practical applications, large-particle plugging mud (e.g., up to 25mm in diameter) was successfully injected without any jamming. A detailed comparison is shown in the table below.

[0023] Example 2 Optionally, when performing high solids content plugging mud injection operations, the existing technology has high viscosity and poor fluidity of high solids content mud, which leads to a large contact area between the valve core and valve seat of the traditional mud pump during injection, making it easy to wear and damage the sealing ring, resulting in mud leakage. The drilling plugging pump using the spherical valve structure provided by this invention features a hollow spherical valve core 1, which reduces valve core weight and improves opening flexibility. The non-metallic sealing ring 3 has high elasticity and high wear resistance, extending service life. In practical applications, plugging mud with a solid content as high as 40% was successfully injected without wear or leakage. A detailed comparison is shown in the table below.

[0024] Example 3 Optionally, when performing high-density, high-viscosity plugging mud injection operations, existing technologies are prone to pressure fluctuations during injection due to the high performance requirements of high-density, high-viscosity mud on pumps, which affects the injection effect, makes the valve structure prone to blockage, and causes the pump to fail to work properly. The drilling plugging pump using the spherical valve structure provided by this invention optimizes the opening height of the spherical valve core 1 to ensure smooth passage of high-density, high-viscosity drilling mud. The conical valve seat 2 design improves mud flowability. In practical applications, plugging mud with a density as high as 2.0 g / cm³ and a viscosity as high as 1000 mPa·s was successfully injected without clogging or pressure fluctuations. Specific comparisons are shown in the table below.

[0025] By comparing the data in Examples 1, 2, and 3 above, it can be clearly seen that the spherical valve structure of the drilling plugging pump provided by the present invention has significant advantages in solving the problem of injecting plugging mud with large-sized particles, high solid content, high density, and high viscosity. This structure not only improves the mud flowability and sealing performance, but also significantly reduces the wear of the valve core and the damage to the sealing ring, extends the service life and operational stability of the pump, and improves operational efficiency and injection effect.

[0026] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A spherical valve structure for a drilling plugging pump, comprising a valve box (8); characterized in that: It also includes a spherical valve core (1), a conical valve seat (2), a non-metallic sealing ring (3), a guide bracket (4), a limiting support (5), a first valve cover (6), and a second valve cover (7); a conical valve seat (2) is provided on the inner side of the valve box (8), a spherical valve core (1) is provided above the conical valve seat (2), a non-metallic sealing ring (3) is provided on the outer side of the spherical valve core (1), a guide bracket (4) is provided on the outer side of the spherical valve core (1), a limiting support (5) is provided above the guide bracket (4), a first valve cover (6) is provided on the inner side of the valve box (8), and a second valve cover (7) is provided on the inner side of the valve box (8).

2. The spherical valve structure for a drilling plugging pump according to claim 1, characterized in that: The spherical valve core (1) is a hollow metal structure. The spherical valve core (1) is used to control the weight of the valve core (1) to ensure that the valve core (1) opens smoothly and falls quickly, and to ensure the opening height and falling speed of the valve core (1). The outer surface of the spherical valve core (1) is spherical and forms a line contact with the inner cone surface of the cone valve seat (2).

3. The spherical valve structure for a drilling plugging pump according to claim 1, characterized in that: The conical valve seat (2) has an inner and outer conical structure. The inner conical surface of the conical valve seat (2) is used to contact the ball valve core (1), and the outer conical surface is used to contact the inner wall of the valve box (8) to ensure the stable installation of the valve seat in the valve box (8). The inner conical surface of the conical valve seat (2) is inlaid with a non-metallic sealing ring (3). The non-metallic sealing ring (3) is made of polyurethane and nylon materials with high elasticity and high wear resistance.

4. The spherical valve structure for a drilling plugging pump according to claim 1, characterized in that: The contact surface between the non-metallic sealing ring (3) and the ball valve core (1) is approximately line contact.

5. The spherical valve structure for a drilling plugging pump according to claim 1, characterized in that: The guide bracket (4) is a cylindrical structure, and the inner side of the guide bracket (4) is provided with a guide groove that cooperates with the ball valve core (1).

6. The spherical valve structure for a drilling plugging pump according to claim 1, characterized in that: The limiting support (5) is set above the guide bracket (4) to limit the floating range of the ball valve core (1).

7. The spherical valve structure for a drilling plugging pump according to claim 1, characterized in that: The first valve cover (6) and the second valve cover (7) are provided with channels that communicate with the inside of the valve box (8).

8. The spherical valve structure for a drilling plugging pump according to claim 1, characterized in that: The valve box (8) is a cylindrical structure. The inner wall of the valve box (8) is fitted with the outer conical surface of the conical valve seat (2) to fix the valve seat and bear the pressure of the mud.

9. The spherical valve structure for a drilling plugging pump according to claim 1, characterized in that: The valve box (8) has a connecting flange interface structure on the outside for connecting to the hydraulic end of the plugging pump.

10. The spherical valve structure for a drilling plugging pump according to claim 1, characterized in that: The specific working steps of this drilling plugging pump with its spherical valve structure include: S1: In the initial state, the ball valve core (1) is located on the conical valve seat (2) under the action of gravity, and the non-metallic sealing ring (3) is in an elastic deformation state, forming a tight contact with the ball valve core (1) to ensure the initial sealing of the valve; S2: When the plugging pump starts working, when the mud is sucked into the hydraulic end of the pump, the ball valve core (1) of the suction valve overcomes gravity under the negative pressure and mud impact and floats upward along the guide bracket (4) to open the valve; at this time, the opening height is large enough to allow large mud particles to pass through smoothly, so that large mud particles can smoothly enter the hydraulic end box (8) cavity. S3: When the mud is discharged, the ball valve core (1) of the suction valve falls back to the valve seat (2) under the action of positive pressure and gravity in the valve box (8) cavity, and fits with the non-metallic (polyurethane or nylon) sealing ring (3) of the valve seat cone surface, thus closing the valve box (8); at the same time, the ball valve core (1) of the discharge valve overcomes gravity and floats upward along the guide bracket (4) under the action of the mud positive pressure, thus opening the valve, so that the mud with large-sized particles is squeezed out of the hydraulic end valve box (8) cavity.

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