Low-torque long-service-life top drive plug valve for extra-deep well

Abstract

The invention relates to the technical field of industrial equipment application, in particular to a low-torque long-service-life top drive plug valve for an extra-deep well, which comprises a valve body, a lower valve seat, a spring, a valve core, an upper valve seat, an upper valve seat cover, a fixing ring, an upper splicing block, a lower splicing block and a connecting assembly, the wear resistance of the ball seat is improved in a gradient level, the service life is long, the characteristics of high strength, high hardness, high wear resistance, high temperature resistance, high oxidation resistance, chemical stability and the like of the hard phase are kept, the good toughness and plasticity of the metal phase are achieved, and the low-torque material layer is compounded on the surface of the tungsten-titanium double-phase gradient alloy again. The friction coefficient of relative sliding surfaces is reduced exponentially, the capability of controllable opening and closing of a product under working pressure is achieved, an upper valve seat bonnet and spring pre-tightening are added to the upper valve seat, more reliable sealing of high pressure and low pressure of the valve element and the valve seat is guaranteed in cooperation with spring pre-tightening of the lower valve seat, and user requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of industrial equipment application, and in particular to a low-torque and high-life top-driven plug valve for ultra-deep wells. Background Art

[0002] The exploration and development of deep oil and gas resources is the main way to achieve the strategic succession of oil and gas resources in oil fields. The top drive plug valve is an important safety tool for preventing blowout in drilling tools.

[0003] However, deep and ultra-deep well drilling has put forward special requirements for top drive plug valves. 1. The top drive plug valve is at the top of the drilling tool with a maximum hanging weight of 15,000 meters. 2. The well pressure is high, and the design is 140MPa to meet the working conditions. 3. The bottom hole temperature is high (200℃ for deep wells). 4. The torque is large. 5. The formation of deep wells is complex. 6. The inner hole of the channel in the drilling tool is large.

[0004] The existing top drive plug valve cannot meet the above requirements. Summary of the invention

[0005] The purpose of the present invention is to provide a low-torque and high-life top-drive plug valve for ultra-deep wells, which solves the problem that the existing top-drive plug valve cannot meet the requirements of a maximum suspended weight of 15,000 meters of drilling tools, high pressure resistance of 140MPa, high temperature resistance (200°C for deep wells), large torque bearing, complex deep well formations, and large inner holes in the drilling tool channel.

[0006] To achieve the above object, the present invention provides a low-torque and high-life top-driven plug valve for ultra-deep wells, comprising a valve body, a lower valve seat, a spring, a valve core, an upper valve seat, an upper valve seat cover, a fixing ring, an upper block, a lower block and a connecting assembly.

[0007] The valve core is arranged inside the valve body, the lower valve seat is arranged at the right end of the valve core, the upper valve seat is arranged at the left end of the valve core, the upper valve seat is arranged at the left end of the upper valve seat is arranged at the upper valve seat cover, there are multiple springs, and the multiple springs are respectively arranged between the valve body and the lower valve seat, and between the upper valve seat and the upper valve seat cover, the left end of the upper valve seat cover is provided with the fixing ring and the upper block, the lower block is provided on the side of the upper valve seat close to the valve body, and the connecting assembly is connected to the valve core.

[0008] Wherein, the connecting assembly comprises a valve stem and a valve stem positioning sleeve, the valve stem is connected to the valve core; the valve stem positioning sleeve is arranged between the valve stem and the valve body.

[0009] Wherein, the valve body has a first step and a second step, the first step is located on the inner side of the left end of the valve body; the second step is located on the outer side of the right end of the valve body.

[0010] The sealing surfaces of the valve core, the upper valve seat and the lower valve seat are all compounded with a tungsten-titanium two-phase gradient alloy, and a low-torque material layer is compounded again on the surface of the tungsten-titanium two-phase gradient alloy.

[0011] Among them, the low-torque and high-life top-driven plug valve for ultra-deep wells also includes a gear and a hexagonal shaft, and the hexagonal shaft cooperates with the valve stem; the gear is fixedly connected to the hexagonal shaft and is located on the outside of the hexagonal shaft.

[0012] Among them, the low-torque and high-life top-driven plug valve for ultra-deep wells also includes a drive sleeve and a drive hydraulic cylinder. The drive sleeve is located on the outside of the valve body, and the gear is meshed with the inner side of the drive sleeve; the drive hydraulic cylinder is connected to the drive sleeve.

[0013] The present invention discloses a low-torque and high-life top-driven plug valve for ultra-deep wells. The valve body is made of high-strength alloy steel, and its mechanical properties are more than 20% higher than the API requirements. The safety factor of the valve body material is greater than 2.5 to ensure that the valve body is subjected to the combined effects of high internal pressure, high axial load (including drilling tools) and high torque during deep well operations. The buckles at both ends of the valve body are designed as double-step male and female buckles, and the first step and the second step increase the torsional strength of the joint by more than 30%, meeting the large torque carried by ultra-deep wells and the complex formations of deep wells. A tungsten-titanium two-phase gradient alloy structure is composited on the sealing surfaces of the valve core, the upper valve seat and the lower valve seat to form a gradient-level lifting ball seat. Wear resistance, long service life, the surface duplex material not only maintains the high strength, high hardness, high wear resistance, high temperature resistance, high oxidation resistance and chemical stability of the hard phase, but also has good toughness and plasticity of the metal phase. The low-torque material layer is compounded again on the surface of the valve core, the upper valve seat and the lower valve seat tungsten-titanium dual-phase gradient alloy, which reduces the relative sliding surface friction coefficient by several times, ensures the low-torque performance of the product switch, and realizes the ability of the product to control the switch under working pressure. The upper valve seat increases the upper valve seat valve cover, and adds the spring preload. The spring preload of the lower valve seat is coordinated to ensure a more reliable sealing of the high and low pressures of the valve core and valve seat to meet user needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0015] Figure 1 It is a cross-sectional view of a low-torque and high-life top-drive plug valve for ultra-deep wells according to a first embodiment of the present invention.

[0016] Figure 2 It is a top view of a low-torque and high-life top-drive plug valve for ultra-deep wells according to a first embodiment of the present invention.

[0017] Figure 3 2 is a schematic structural diagram of a gear according to a second embodiment of the present invention.

[0018] In the figure: 101-valve body, 102-lower valve seat, 103-spring, 104-valve core, 105-upper valve seat, 106-upper valve seat cover, 107-fixing ring, 108-upper assembly block, 109-lower assembly block, 110-valve stem, 111-valve stem positioning sleeve, 112-first step, 113-second step, 201-gear, 202-hexagonal shaft, 203-driving sleeve, 204-driving cylinder. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0020] The first embodiment of the present application is:

[0021] See also Figure 1 and Figure 2 ,in, Figure 1 It is a cross-sectional view of a low-torque and high-life top-drive plug valve for ultra-deep wells according to a first embodiment of the present invention. Figure 2 The present invention provides a low-torque and high-life top-driven plug valve for ultra-deep wells, which includes a valve body 101, a lower valve seat 102, a spring 103, a valve core 104, an upper valve seat 105, an upper valve seat cover 106, a fixing ring 107, an upper block 108, a lower block 109 and a connecting assembly, wherein the connecting assembly includes a valve stem 110 and a valve stem positioning sleeve 111, and the valve body 101 has a first step 112 and a second step 113.

[0022] According to this specific embodiment, the valve core 104 is arranged inside the valve body 101, the lower valve seat 102 is arranged at the right end of the valve core 104, the upper valve seat 105 is arranged at the left end of the valve core 104, the upper valve seat cover 106 is arranged at the left end of the upper valve seat 105, the number of the springs 103 is multiple, and the multiple springs 103 are respectively arranged between the valve body 101 and the lower valve seat 102, and between the upper valve seat 105 and the upper valve seat cover 106, the left end of the upper valve seat cover 106 is provided with the fixing ring 107 and the upper block 108, the side of the upper valve seat 105 close to the valve body 101 is provided with the lower block 109, and the connecting assembly is connected to the valve core 104. The valve stem 110 is connected to the valve core 104; the valve stem positioning sleeve 111 is arranged between the valve stem 110 and the valve body 101. The valve body 101, the lower valve seat 102, the spring 103, the valve core 104, the upper valve seat 105, the upper valve seat cover 106, the fixing ring 107, the upper block 108, and the lower block 109 are all arranged inside the valve body 101. The spring 103 is in a compressed state between the valve body 101 and the lower valve seat 102. The lower valve seat 102 and the valve core 104 are in close contact with each other through the action of the spring 103. The top of the valve body 101 has a groove, which is connected to the valve stem 110 through the groove. The valve stem 110 drives the valve core 104 to rotate. The valve body 101 and the valve stem 110 are lubricated by the valve stem positioning sleeve 111. The upper block 108 is a perfect circular support block. The outer circle of the upper block 108 is equal to the inner circle radius of the fixing ring 107. The fixing ring 107 is fixed in the circumferential direction by the action of the upper block 108. The lower block 109 fixes the upper valve seat 105. The upper valve seat 105 is increased with the upper valve seat cover 106, and the spring 103 is added for pre-tightening. The pre-tightening of the spring 103 in cooperation with the lower valve seat 102 ensures a more reliable sealing of the high and low pressure of the valve core 104 valve seat.

[0023] The first step 112 is located on the inner side of the left end of the valve body 101, and the second step 113 is located on the outer side of the right end of the valve body 101. The first step 112 and the second step 113 are double-step male and female buckles, which increase the torsional strength of the joint by more than 30%, meeting the large torque and complex formation problems of ultra-deep wells.

[0024] Secondly, the sealing surfaces of the valve core 104, the upper valve seat 105 and the lower valve seat 102 are all compounded with a tungsten-titanium two-phase gradient alloy, and a low-torque material layer is compounded again on the surface of the tungsten-titanium two-phase gradient alloy. The tungsten-titanium two-phase gradient alloy structure is compounded on the sealing surface of the valve core 104 and the valve seat body, which improves the wear resistance of the ball seat in a gradient manner and prolongs the service life. The surface two-phase material not only maintains the high strength, high hardness, high wear resistance, high temperature resistance, high oxidation resistance and chemical stability of the hard phase, but also has the good toughness and plasticity of the metal phase. The low-torque material layer is compounded again on the surface of the tungsten-titanium two-phase gradient alloy of the valve core 104 and the valve seat, which reduces the friction coefficient of the relative sliding surface exponentially and ensures the low-torque performance of the product switch. The ability of the product to control the switch under working pressure is realized. The implementation of the combined process first reduces the switching torque of the plug valve exponentially; second, the 3D printed tungsten-titanium alloy composite layer on the spherical surface improves the hardness and strength of the spherical surface, maintains the toughness of the core of the ball seat, and avoids the possibility of failure of the sealing surface of the ball seat due to strain or scratches under granular media; the product has extremely high impact resistance, avoiding the possibility of brittle fracture failure of the valve core 104 and the valve seat due to well pressure impact or shock. The third WT tungsten-titanium alloy layer has the ability to resist corrosion from various acids, alkalis, and salts, avoiding the possibility of failure of the valve seat seal due to corrosion pits. The implementation of the fourth combined process can ensure that the product works normally under working conditions at 177°C, and is extremely resistant to high temperatures.

[0025] A low-torque, high-life top-driven plug valve for ultra-deep wells using this embodiment adopts the metal-sealed valve core 104, with the double-sided spring 103 compensation and pressure-assisted sealing mechanism, and has reliable sealing performance under both high and low pressures. It changes the design structure of the conventional ball valve. In order to achieve high-pressure sealing, an upper and lower double-sided pressure-assisted sealing mechanism is designed, so that the pressure of the sealed fluid generates a sealing force between the valve core 104 and the upper and lower valve seats 102, and this sealing force plays a role in pressure-assisted sealing. In order to achieve low-pressure sealing, multiple groups of spring 103 pre-tightening mechanisms are designed. The spring 103 provides the force required to press the upper valve seat 105 and the lower valve seat 102 against the ball of the valve core 104, and when the valve core 104 is sealed from below, the spring 103 can provide a sealing force that is not affected by the pressure difference of the valve core 104. Under low pressure, the spring 103 with a certain preload force pushes the upper valve seat 105 or the lower valve seat 102 toward the valve core 104, so that they keep in contact and have a certain contact force. At this time, if low-pressure fluid passes through the internal blowout preventer, the fluid will not leak because the valve core 104 is in close contact with the upper valve seat 105 and has a certain preload force. As the fluid pressure gradually increases, the preload force may not be enough to seal the fluid. In order to prevent the fluid from leaking, the axial force generated by the fluid pressure on the area difference at both ends of the sealing ring will increase with the increase in pressure. This axial force makes the upper valve seat 105, the lower valve seat 102 and the valve core 104 further tightly combined, thereby ensuring the sealing of the fluid under high pressure. The 90° rotation of the valve stem 110 drives the 90° rotation of the valve core 104 to achieve the closure of the channel. The biggest feature of the product is that it can realize a low-torque single-person manual switch plug valve under high pressure difference working pressure. The second major feature of IBOP is its high wear resistance, erosion resistance and long service life. The third major feature of Yinhe IBOP is its high corrosion resistance to acids, alkalis and salts. It can be opened and closed under pressure for drilling operations; it can be opened and closed normally under pressure after being subjected to working pressure in one direction for a long time. The valve body 101 has high strength, large load-bearing capacity, and strong torsion resistance of the double-step buckle. The product has a high safety factor and can meet the requirements of long-term operation of the product under combined industrial and mining conditions of tension, rotation and compression. The product has good sealing, compact structure and simple operation. It meets user needs.

[0026] The second embodiment of the present application is:

[0027] Based on the first embodiment, please refer to Figure 3 ,in, Figure 3 The structure diagram of the gear 201 of the second embodiment of the present invention is shown in FIG. The ultra-deep well low-torque and high-life top-drive plug valve of this embodiment further includes a gear 201 , a hexagonal shaft 202 , a drive sleeve 203 and a drive cylinder 204 .

[0028] According to this specific embodiment, the hexagonal shaft 202 is matched with the valve stem 110; the gear 201 is fixedly connected with the hexagonal shaft 202 and is located outside the hexagonal shaft 202. The driving sleeve 203 is located outside the valve body 101, and the gear 201 is meshed with the inner side of the driving sleeve 203; the driving fluid cylinder 204 is connected with the driving sleeve 203. The driving fluid cylinder 204 drives the driving sleeve 203 to move, and the inner side of the driving sleeve 203 has a tooth groove, which is meshed with the gear 201, and drives the gear 201 to rotate, and the hexagonal shaft 202 is matched with the hexagonal hole at the top of the shaft 110.

[0029] A low-torque and high-life top-driven plug valve for ultra-deep wells according to the present embodiment is used. Under the action of the driving hydraulic cylinder 203, the driving sleeve 203 moves up and down, and the gear 201 rotates accordingly to drive the hexagonal shaft 202 to rotate. The hexagonal shaft 202 cooperates with the hexagonal hole of the valve stem 110 to realize the opening and closing of the plug valve.

[0030] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A low torque and high life top drive plug valve for ultra-deep wells, characterized in that: It includes valve body, lower valve seat, spring, valve core, upper valve seat, upper valve seat cover, fixing ring, upper block, lower block and connecting components. The valve core is arranged inside the valve body, the lower valve seat is arranged at the right end of the valve core, the upper valve seat is arranged at the left end of the valve core, the upper valve seat is arranged at the left end of the upper valve seat is arranged at the upper valve seat cover, there are multiple springs, and the multiple springs are respectively arranged between the valve body and the lower valve seat, and between the upper valve seat and the upper valve seat cover, the left end of the upper valve seat cover is provided with the fixing ring and the upper block, the lower block is provided on the side of the upper valve seat close to the valve body, and the connecting assembly is connected to the valve core.

2. The low torque and long life top drive plug valve for ultra-deep wells according to claim 1, characterized in that: The connecting assembly comprises a valve stem and a valve stem positioning sleeve, wherein the valve stem is connected to the valve core; and the valve stem positioning sleeve is arranged between the valve stem and the valve body.

3. The low torque and long life top drive plug valve for ultra-deep wells according to claim 1, characterized in that: The valve body has a first step and a second step, wherein the first step is located on the inner side of the left end of the valve body; and the second step is located on the outer side of the right end of the valve body.

4. The low torque and long life top drive plug valve for ultra-deep wells according to claim 1, characterized in that: The sealing surfaces of the valve core, the upper valve seat and the lower valve seat are all compounded with a tungsten-titanium two-phase gradient alloy, and a low-torque material layer is compounded again on the surface of the tungsten-titanium two-phase gradient alloy.

5. The low torque and long life top drive plug valve for ultra-deep wells according to claim 2, characterized in that: The low-torque and high-life top-driven plug valve for ultra-deep wells also includes a gear and a hexagonal shaft, wherein the hexagonal shaft cooperates with the valve stem; the gear is fixedly connected to the hexagonal shaft and is located outside the hexagonal shaft.

6. The low torque and long life top drive plug valve for ultra-deep wells as claimed in claim 5, characterized in that: The low-torque and high-life top-drive plug valve for ultra-deep wells also includes a drive sleeve and a drive hydraulic cylinder. The drive sleeve is located on the outside of the valve body, and the gear is meshed with the inner side of the drive sleeve; the drive hydraulic cylinder is connected to the drive sleeve.

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