Two-way compression device for steel wire rope sealing packing

Abstract

The invention relates to the technical field of bailing oil extraction, in particular to a two-way compression device for a steel wire rope sealing packing. The steel wire rope sealing packing two-way compression device comprises a top column lead screw, an upper gland, a conical barrel, two force application rods and an expansion sleeve, the two force application rods comprise the first force application rod and the second force application rod, a steel wire rope is arranged in the top column lead screw, a packing set is arranged at the lower end of the steel wire rope, and the expansion sleeve is sleeved with the conical barrel. A compensation mechanism is arranged at the lower end of the packing set, the lower end of the jacking column lead screw is sequentially sleeved with an upper gland, a taper sleeve and an expansion sleeve, a plurality of grooves are evenly formed in the outer wall of the expansion sleeve, and magnets and steel balls are arranged in the grooves respectively. According to the two-way compression device for the steel wire rope sealing packing, original single axial pressure application is changed into radial and axial two-way simultaneous pressure application, so that the whole packing set is completely pressed, and the pressure borne by all the packing in the packing set is the same through the compensation mechanism; and the sealing effect of the device is improved, so that the purposes of reducing the production cost and improving the working efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil extraction and bailing, and in particular to a bidirectional compression device for a wire rope sealing packing. Background Art

[0002] Under the existing technology, the wellhead sealing device of the oil extraction vehicle is an ordinary column packing box, which adopts axial and unilateral pressure. This structure has the advantages of being simple and easy to process. It has been a product used in the oil field production industry for decades. However, this column packing box has the following disadvantages: First, it wears out quickly, especially when used on the oil extraction vehicle. A set of packing needs to be replaced after an average of 1.5 days of use. The service life is even shorter in winter due to the drop in temperature. Second, it consumes a lot of physical strength in the process of tightening the packing group. The disadvantage of unidirectional compression is that the friction resistance is large. Under the action of the compression force, the packing group is subjected to downward and radial forces. Since the outer cylindrical surface of the packing group is constrained by the cylinder wall, the packing group is elastically deformed downward and inward, tightly fitting with the sealed surface to achieve the purpose of sealing. During the compression process, the packing group moves downward as a whole. The relative movement between it and the cylinder wall becomes extremely difficult due to the existence of friction, resulting in uneven force on the upper and lower parts of the packing group. The packing close to the force-bearing end is compressed more and has a greater compression force. The packing far away from the end is subjected to less compression force due to the friction between the rubber and the metal cylinder wall. In order to achieve the purpose of sealing, the compression force needs to be increased, which makes the packing close to the force-bearing end wear faster. At the same time, it also generates greater friction resistance with the sealed metal surface, making it difficult to move or rotate the sealed body, wasting effective power. Summary of the Invention

[0003] (1) Technical issues to be resolved The present invention provides a bidirectional compression device for wire rope sealing packing, so as to overcome the problem in the prior art that the packing group is subjected to uneven force due to unilateral sealing, which makes it difficult for the sealing body in the packing group to move after sealing is completed, thereby wasting effective power during operation.

[0004] (2) Technical solution To achieve the above object, the present invention provides a bidirectional compression device for wire rope sealing packing, comprising: a top column screw, an upper gland, a cone, two force rods and an expansion and contraction sleeve; The two force applying rods include: a first force applying rod and a second force applying rod; The top column screw is a hollow cylindrical structure, the outer wall of the upper end of the top column screw is provided with an outer edge step, a first force rod is provided on one side of the upper end of the top column screw, a steel wire rope is provided in the top column screw, and a packing group is provided at the lower end of the steel wire rope; The lower end of the top column screw is covered with an upper gland, a cone sleeve and an expansion sleeve in sequence; The packing group is an annular structure, and is composed of a plurality of packings. The packing group is arranged at the lower end of the top column screw, and a compensation mechanism is provided at the lower end of the packing group; The expansion and contraction sleeve is composed of two opposite hollow frustum structures. The lower end of the expansion and contraction sleeve is embedded in the cone, and the lower end of the cone is connected to the well head. The outer wall of the expansion and contraction sleeve is evenly provided with a plurality of grooves, and magnets and steel balls are respectively provided in the grooves. The plurality of grooves are spaced apart from each other, and the opening directions of every two adjacent grooves are opposite to each other in the upper and lower directions.

[0005] Preferably, the compensation mechanism includes: a lower push column, a spring and a chassis. The lower push column is arranged at the lower end of the packing group. A spring is provided in the lower push column. A chassis is provided at the lower end of the spring. The lower push column is pushed upward under the action of the spring.

[0006] Preferably, the upper pressure cover is a hollow cylindrical structure, a second force rod is provided on the outer wall of the upper pressure cover, a step is provided inside the upper pressure cover, the upper end of the upper pressure cover is threadedly connected to the top column screw, and the lower end of the upper pressure cover is threadedly connected to the conical cylinder. The second force rod can make the upper pressure cover move up and down along the outer wall thread of the top column screw.

[0007] Preferably, the cone is a hollow cylindrical structure, a truncated cone-shaped groove is provided in the center of the upper end face of the cone, and a through hole is provided at the lower end of the cone; the cone sleeve is a cylindrical structure, a truncated cone-shaped groove is provided in the center of the lower end face of the cone sleeve, and a through hole is provided at the upper end of the cone sleeve.

[0008] Preferably, the number of grooves on the outer wall of the expansion and contraction sleeve is an even number, and the even number of grooves can enable the expansion and contraction sleeve to be subjected to overall force when sliding up and down in the cone.

[0009] Preferably, it further comprises a pressure ring, which is an annular structure and is arranged between the top column screw and the packing assembly.

[0010] Preferably, the steel ball provided in the groove on the outer wall of the expansion and contraction sleeve is limited by a magnet, which is provided at the bottom of the groove. The steel ball can rotate, and the steel ball enables the expansion and contraction sleeve to slide up and down in the cone.

[0011] Preferably, two sealing rings are also included, and the two sealing rings include: a first sealing ring and a second sealing ring. The first sealing ring is arranged at the upper end of the pressure ring, and the first sealer fixes the pressure ring. The second sealing ring is arranged between the lower top column and the chassis, and the second sealing ring ensures that the liquid does not leak.

[0012] Preferably, the taper of the cone structure at the lower end of the expansion and contraction sleeve matches the taper of the conical cylinder.

[0013] Preferably, the taper of the cone structure at the upper end of the expansion and contraction sleeve matches the taper of the tapered sleeve.

[0014] (3) Beneficial effects The present invention provides a bidirectional compression device for wire rope sealing packing, which can change the compression mode of the packing group from the original single axial pressure to the radial and axial bidirectional simultaneous pressure under the joint action of the expansion and contraction sleeve and the top column screw, so that the packing group as a whole is fully and completely pressurized, the packing group fully expands under the action of force, and the packing group can be squeezed in both the upper and lower directions through the compensation mechanism, so that the pressure exerted on each packing in the packing group is the same, the packing expansion degree is the same, the sealing effect of the device is improved, it is ensured that the wire rope does not carry well fluid during operation, the service life of consumables in the device is increased, thereby achieving the purpose of reducing production costs and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the assembly of a bidirectional compression device for a wire rope sealing packing according to the present invention is shown; Figure 2 A cross-sectional view of an expansion and contraction sleeve of a bidirectional compression device for a wire rope sealing packing according to the present invention is shown; Figure 3 A top cross-sectional view of an expansion and contraction sleeve of a bidirectional compression device for a wire rope sealing packing according to the present invention is shown.

[0016] Among them: 1: top column screw; 2: cone sleeve; 3: pressure ring; 4: upper cover; 5: expansion and contraction sleeve; 6: steel column; 7: magnet; 8: lower top column; 9: spring; 10: sealing ring; 11: chassis; 12: cone; 13: force rod; 14: packing group; 15: wire rope; 16: wellhead. DETAILED DESCRIPTION

[0017] The present invention is described in detail below with reference to the accompanying drawings and embodiments, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative efforts shall fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by “up”, “down”, “left”, “right”, “inside”, “outside”, “top”, “bottom”, etc. are all based on the directions or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on the present invention.

[0019] like Figure 1-3 As shown, the present invention provides a bidirectional compression device for wire rope sealing packing, comprising: a top column screw 1, an upper gland 4, a cone 12, two force rods 13 and an expansion sleeve 5; The two force rods 13 include: a first force rod and a second force rod. The force rod 13 is a cylindrical structure. The first force rod is arranged on one side of the upper end of the top column screw 1, and the second force rod is arranged on the outer wall of the upper pressure cover 4. The top column screw 1 is a hollow cylindrical structure. The outer wall of the top column screw 1 is provided with a thread, the outer wall of the top column screw 1 is provided with a step, a first force rod is provided on one side of the top column screw 1, a wire rope 15 is provided in the top column screw 1, the lower end of the top column screw 1 is sequentially covered with an upper pressure cover 4, a sleeve 2 and an expansion sleeve 5, a packing group 14 is provided at the lower end of the top column screw 1, the packing group 14 is sleeved on the wire rope 15, and a lower top column 8 is provided at the lower end of the packing group 14. The lower top column 8 is a hollow cylindrical structure. Structure, a spring 9 is provided in the lower top column 8, and a chassis 11 is provided at the lower end of the lower top column 8. The lower top column 8, spring 9 and chassis 11 constitute a compensation mechanism. The expansion and contraction sleeve 5 consists of two hollow frustum structures. The lower end of the expansion and contraction sleeve 5 is embedded in the cone 12. The lower end of the cone 12 is threadedly connected to the wellhead 16. The outer wall of the expansion and contraction sleeve 5 is provided with a plurality of grooves, and magnets 7 and steel balls 6 are provided in the grooves. The plurality of grooves are spaced apart from each other, and the opening directions of every two adjacent grooves are opposite to each other. The upper gland 4 is a hollow cylindrical structure with a second force-applying rod provided on its outer wall. This second force-applying rod can be used to apply force to cause the upper gland 4 to move up and down along the threads on the outer wall of the ejector screw 1. A step is provided inside the upper gland 4. The upper gland 4 is threadedly connected to the ejector screw 1. By operating the second force-applying rod, the upper gland 4 can be moved up and down on the ejector screw 1, thereby achieving the desired position adjustment or pressure control. The cone 12 is a cylindrical structure, a truncated cone-shaped groove is provided at the center of the upper end surface of the cone 12, a through hole is provided at the lower end of the cone 12, the cone sleeve 2 is a cylindrical structure, a truncated cone-shaped groove is provided at the center of the lower end surface of the cone sleeve 2, a through hole is provided at the upper end of the cone sleeve 2, the pressure ring 3 is an annular structure, the pressure ring 3 is provided between the top column screw 1 and the packing group 14, the pressure ring 3 fixes the packing group 14, the two sealing rings 10 include: a first sealing ring and a second sealing ring, the upper end of the pressure ring 3 is provided with a first sealing ring, the first sealing ring fixes the pressure ring 3, a second sealing ring is provided between the lower top column 8 and the chassis 11, the second sealing ring is mainly used to ensure the sealing performance between the lower top column 8 and the chassis 11; The lower top column 8, spring 9, and chassis 11 in the device constitute the compensation mechanism of the device. Under the action of the spring 9, the compensation mechanism moves accordingly with the movement of the expansion and contraction sleeve 5 and the packing group 14. The compensation mechanism ensures that the liquid in the device will not leak out. The outer surface of the lower top column 8 and the chassis 11 are sealed by a second sealing ring, which further ensures the sealing performance.

[0020] It should be noted that the telescopic size of the compensation mechanism is smaller than the upward and downward sizes of the expansion and contraction sleeve 5. When the expansion and contraction sleeve 5 continues to descend and reaches the telescopic size limit of the compensation mechanism, the lower push column 8 in the compensation mechanism will not descend. The lower push column 8 is pushed upward under the action of the spring 9, which is equivalent to directly axially compressing the packing group 14 in both directions, thereby achieving the effect of bidirectional compression, making the device more effective in dealing with liquid leakage problems.

[0021] In the device, the expansion and contraction sleeve 5, steel balls 6 and magnets 7 constitute the expansion and contraction structure of the device. The outer wall of the expansion and contraction sleeve 5 is evenly provided with a plurality of grooves. The plurality of grooves are spaced apart from each other, and the opening directions of every two adjacent grooves are opposite to each other. Magnets 7 and steel balls 6 are respectively provided in the grooves. The steel balls 6 in the grooves are limited by the magnets 7. Under the action of the magnetic force, the steel balls 6 can fall into the cone 12 without falling out of the grooves. At the same time, the steel balls 6 can rotate. The steel balls 6 reduce the friction between the expansion and contraction sleeve 5 and the cone 12 during the movement, so that the top column screw 1 and the upper pressure cover 4 do not need to consume too much effort when they need to be rotated and pressed down, thereby ensuring accurate and reliable operation.

[0022] The taper of the frustum structure at the lower end of the expansion and contraction sleeve 5 matches the taper of the tapered cylinder 12, so that the packing group 14 is subjected to downward axial force and inward radial force, thereby compressing the packing group 14 more evenly. The lower end of the top column screw 1 contacts the packing group 14 to prevent liquid leakage. The taper of the frustum structure at the upper end of the expansion and contraction sleeve 5 matches the taper of the tapered sleeve 2. When the packing group 14 is in use, the inner hole of the packing group 14 is continuously worn. The expansion and contraction sleeve 5 is pressed downward by the rotation of the upper cover 4. The expansion and contraction sleeve 5 moves downward to press the packing group 14 downward to shrink the inner hole of the packing group 14.

[0023] The following is a detailed introduction to the actual working conditions of the wire rope sealing packing bidirectional compression device.

[0024] In actual work, the threaded part at the lower end of the cone 12 of the device is connected to the well head 16, and the wire rope 15 is passed through it from top to bottom. The lower end of the wire rope 15 is connected and tightened to the bailing pump, and the bailing pump is lowered into the well. After stabilizing the well head 16, the upper gland 4 is rotated to the left by the force rod 13 and opened to lift it. The packing group 14 is added to the wire rope 15 below it. The number of packing groups depends on the axial length of the expansion and contraction sleeve 5. The packing groups 14 are placed in the expansion and contraction sleeve 5 in turn and installed in the cone 12. The upper gland 4 is rotated to the right so that the cone sleeve 2 contacts the upper end of the expansion and contraction sleeve 5 and presses down the expansion and contraction sleeve 5, so that the packing group 14 is subjected to a certain radial compression force. The wire rope 15 and the bailing pump suspended thereon are lowered to start bailing oil. If the wire rope 15 is oily during operation, the first force-applying rod is used to tighten the top column screw 1 until there is no oil. During the tightening process, the packing group 14 is subjected to an axial force from top to bottom. Since the friction coefficient between the outer surface of the packing group 14 and the inner wall of the expansion and contraction sleeve 5 is large, the downward pressure process causes the expansion and contraction sleeve 5 to be subjected to a downward force. The outer surface of the expansion and contraction sleeve 5 has a groove, and a magnet 7 is installed at the lower end of the groove. The upper end of the magnet 7 absorbs the steel ball 6, so that the steel ball 6 rolls when the expansion and contraction sleeve 5 moves downward, driving the expansion and contraction body as a whole to move downward, compressing the expansion and contraction sleeve 5 and causing the packing group 14 to be radially compressed. Therefore, through the rotation of the top column screw 1, the radial and axial dual dynamic compression of the packing group 14 can be achieved. After a period of use, the inner hole of the packing group 14 is worn out. At this time, the second force rod on the upper cover 4 is rotated clockwise 1-2 times to make the expansion sleeve 5 move downward, forcing the packing group 14 to contract radially, reducing the inner hole of the packing group 14. Since the volume of each 1mm of the outer diameter of the packing group 14 is equivalent to the volume of 3mm of the inner hole, the upper cover 4 can achieve the purpose without excessive tightening. At this time, continue to operate the first force rod on the top column screw 1 to achieve the sealing requirement. After several cycles of operation, the compensation mechanism at the lower end begins to play an important role. As the expansion sleeve 5 and the packing group 14 move up and down, they pop out or press down to ensure that the liquid medium does not leak out of the cavity. The outer surface of the lower column 8 and the inner hole of the bottom plate 11 are sealed by the sealing ring 10.

[0025] It can be understood that the above-mentioned embodiments mentioned in the present invention can be combined with each other to form combined embodiments without violating the principle logic. Due to space limitations, the present invention will not elaborate on them.

[0026] Those skilled in the art will understand that in the above-mentioned method of the specific implementation method, the writing order of each step does not mean a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0027] The present invention provides a bidirectional compression device for sealing packing of a wire rope, which changes the compression mode of the packing group 14 from the original single axial pressure to the simultaneous radial and axial pressure under the joint action of the expansion and contraction sleeve 5 and the top column screw 1, so that the packing group 14 as a whole is fully and completely pressurized. Through the compensation mechanism, the packing group 14 can be squeezed in both the upper and lower directions, so that the pressure on each packing is the same, and the expansion degree of the packing group 14 is the same, which improves the sealing effect of the device and increases the service life of the consumables in the device, thereby achieving the purpose of reducing production costs and improving work efficiency.

[0028] While various embodiments of the present invention have been described above, the above descriptions are intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A bidirectional compression device for wire rope sealing packing, characterized in that: include: A top column screw (1), an upper pressure cover (4), a tapered cylinder (12), two force application rods (13) and an expansion sleeve (5); The two force application rods (13) include: a first force application rod and a second force application rod; The top column screw (1) is a hollow cylindrical structure, the outer wall of the upper end of the top column screw (1) is provided with an outer edge step, a first force application rod is provided on one side of the upper end of the top column screw (1), a steel wire rope (15) is provided in the top column screw (1), and a packing group (14) is provided at the lower end of the steel wire rope (15); The lower end of the top column screw (1) is covered with an upper pressure cover (4), a cone sleeve (2) and an expansion sleeve (5) in sequence; The packing group (14) is an annular structure, and the packing group (14) is composed of a plurality of packings. The packing group (14) is arranged at the lower end of the top column screw (1), and a compensation mechanism is provided at the lower end of the packing group (14); The expansion and contraction sleeve (5) is composed of two opposite hollow cone structures. The lower end of the expansion and contraction sleeve (5) is embedded in the cone (12). The lower end of the cone (12) is connected to the well head (16). The outer wall of the expansion and contraction sleeve (5) is evenly provided with a plurality of grooves. Magnets (7) and steel balls (6) are respectively provided in the grooves. The plurality of grooves are spaced apart from each other, and the opening directions of each two adjacent grooves are opposite to each other in the vertical direction.

2. The bidirectional compression device for wire rope sealing packing according to claim 1, characterized in that: The compensation mechanism comprises: a lower push column (8), a spring (9) and a chassis (11); the lower push column (8) is arranged at the lower end of the packing group (14); a spring (9) is arranged in the lower push column (8); a chassis (11) is arranged at the lower end of the spring (9); and the lower push column (8) is pushed upward under the action of the spring (9).

3. The bidirectional compression device for wire rope sealing packing according to claim 1, characterized in that: The upper pressure cover (4) is a hollow cylindrical structure. A second force rod is provided on the outer wall of the upper pressure cover (4). A step is provided inside the upper pressure cover (4). The upper end of the upper pressure cover (4) is threadedly connected to the top column screw (1), and the lower end of the upper pressure cover (4) is threadedly connected to the cone (12). The second force rod can enable the upper pressure cover (4) to move up and down along the outer wall thread of the top column screw (1).

4. The bidirectional compression device for wire rope sealing packing according to claim 1, characterized in that: The cone (12) is a hollow cylindrical structure, a truncated cone-shaped groove is provided at the center of the upper end surface of the cone (12), and a through hole is provided at the lower end of the cone (12); the cone sleeve (2) is a cylindrical structure, a truncated cone-shaped groove is provided at the center of the lower end surface of the cone sleeve (2), and a through hole is provided at the upper end of the cone sleeve (2).

5. The bidirectional compression device for wire rope sealing packing according to claim 1, characterized in that: The number of grooves on the outer wall of the expansion and contraction sleeve (5) is an even number, and the even number of grooves enables the expansion and contraction sleeve (5) to be subjected to force as a whole when sliding up and down in the cone (12).

6. The bidirectional compression device for wire rope sealing packing according to claim 1, characterized in that: It also includes a pressure ring (3), which is a ring-shaped structure and is arranged between the top column screw (1) and the packing group (14).

7. The bidirectional compression device for wire rope sealing packing according to claim 1, characterized in that: The steel ball (6) provided in the groove on the outer wall of the expansion and contraction sleeve (5) is limited by a magnet (7) which is provided at the bottom of the groove. The steel ball (6) can rotate, and the steel ball (6) enables the expansion and contraction sleeve (5) to slide up and down in the cone (12).

8. The bidirectional compression device for wire rope sealing packing according to claim 2, characterized in that: It also includes two sealing rings (10), the two sealing rings (10) including: a first sealing ring and a second sealing ring, the first sealing ring being arranged at the upper end of the pressure ring (3), the first sealer fixing the pressure ring (3), and the second sealing ring being arranged between the lower top column (8) and the bottom plate (11), and ensuring that the liquid does not leak out.

9. The bidirectional compression device for wire rope sealing packing according to claim 1, characterized in that: The taper of the cone structure at the lower end of the expansion and contraction sleeve (5) matches the taper of the cone cylinder (12).

10. The bidirectional compression device for wire rope sealing packing according to claim 1, characterized in that: The taper of the cone structure at the upper end of the expansion and contraction sleeve (5) matches the taper of the tapered sleeve (2).

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