A quick-release wellhead wire rope blowout prevention box for oil well pumping

Abstract

The present invention provides a quick-release wellhead wire rope blowout prevention box for oil well pumping, and relates to the technical field of oil well downhole oil and gas testing. The quick-release wellhead wire rope blowout prevention box for oil well pumping comprises a shell, a quick-release device is arranged at the lower part of the shell, and the shell is connected with the pumping tee slot through the quick-release device; the quick-release device comprises a latching tongue, and the latching tongue is limited by a convex column and slidably connected inside a transverse slide groove of the lower side wall of the shell, and the end of the latching tongue away from the central axis of the shell and the middle and lower part of the latching tongue are both provided with a guide inclined surface, and the other end of the latching tongue is fixedly connected to the side wall of the transverse slide groove close to the central axis of the shell through a latching tongue spring. Through the arrangement of the quick-release device, the wire rope blowout prevention box can realize the automatic fixing and disengagement function with the pumping tee only by relying on the body weight and the lifting force of the wire rope, thereby avoiding the disadvantage that the traditional wire rope blowout prevention box needs manual auxiliary fixing.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas testing in oil wells, in particular to a quick-clip-off wellhead wire rope blowout prevention box for oil well pumping. Background Art

[0002] There are problems with the operability of traditional wire rope blowout preventers at the wellhead. After each pumping and lifting, the wire rope blowout preventer needs to be fixed on the pumping tee with manual assistance, such as binding it with wire, or passing a pin of appropriate strength through the pin in the air. Although some improved blowout preventers also have a tension locking structure, they are not very practical and there are problems with inaccurate and loose locking. In the end, manual assistance is still required for fixation. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a quick-clip-off wellhead wire rope blowout preventer box for oil well pumping, which solves the problem that the wire rope blowout preventer box needs manual assistance to fix. By setting up a quick-clip-off device, the wire rope blowout preventer box can be automatically fixed and disconnected from the pumping tee only by relying on its own weight and the lifting force of the wire rope, thus avoiding the disadvantage that the traditional wire rope blowout preventer box needs manual assistance to fix.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a quick-release wellhead wire rope blowout prevention box for oil well pumping, comprising a shell, a quick-release device is provided at the lower part of the shell, and the shell is connected to the pumping three-way card slot through the quick-release device;

[0005] The quick-release device includes a latching tongue, which is limited by a protruding column and slidably connected to the inside of a horizontal slide groove on the side wall of the lower shell, and the latching tongue is provided with a guide inclined surface at one end of the latching tongue away from the central axis of the shell and the middle and lower part of the latching tongue. The other end of the latching tongue is fixedly connected to the horizontal slide groove close to the side wall of the central axis of the shell by a latching tongue spring, and the latching tongue spring always pushes the latching tongue laterally to extend to the outside of the horizontal slide groove, and the horizontal dimension of the latching tongue outside the horizontal slide groove is smaller than the dimension of the latching tongue's retreat stroke to the inside of the horizontal slide groove. A vertical slide groove is arranged around the lower end of the shell, and a striker is slidably connected to the inner wall of the vertical slide groove, and the striker is fixedly connected to the upper wall of the vertical slide groove by the striker spring, and the upper end of the striker penetrates the vertical slide groove to extend to the inside of the horizontal slide groove and is located below the guide inclined surface in the middle and lower part of the latching tongue, and a striker baffle with a central opening is fixedly connected below the striker rod.

[0006] Preferably, the shell is respectively a first shell, a second shell, a third shell and a fourth shell from top to bottom, and they are fixedly connected in sequence by threads.

[0007] Preferably, a sealing rubber is sleeved inside the third shell and the fourth shell, and the central axis of the sealing rubber passes through from top to bottom and is used to wrap the steel wire rope.

[0008] Preferably, the upper portion of the sealing rubber is a conical inclined surface, and a raised block is provided in the middle portion of the third shell, and the slope of the block inclined surface is the same as that of the conical inclined surface of the sealing rubber.

[0009] Preferably, the sealing rubber is arranged to be split in half along the central axis.

[0010] Preferably, the internal cavity of the second shell is a steam cleaning space for cleaning the wire rope.

[0011] Preferably, a straightening roller is provided at the upper end of the first shell, and the straightening roller is used for straightening the wire rope.

[0012] Preferably, the inner wall of the shell and the surface of the impact baffle are sprayed with rubber paint.

[0013] Preferably, the method for using the quick-release wellhead wire rope blowout preventer box for oil well pumping comprises the following steps:

[0014] Step 1: When the wire rope blowout prevention box is in use, the quick release device uses the deadweight of the blowout prevention box to cause the tongue to compress the tongue spring under the action of the guide slope, so that the tongue is retracted from the upper edge of the slot of the pumping tee. After passing the upper edge, the tongue is pushed by the tongue spring to extend into the slot of the pumping tee to complete the fixation;

[0015] Step 2: The wire rope is lifted up to drive the rope cap to hit the impact baffle, so that the impact rod moves upward, compresses the impact rod spring and inserts into the lower and middle guide slope of the tongue. Under the action of the guide slope, the tongue compresses the tongue spring, and the tongue retracts to release the card, and the removal is completed;

[0016] Step 3: When the steel wire rope is pumped at the same time, the steel wire rope drives the sealing rubber to move upward and the sealing rubber is limited and compressed by the blocking inclined surface, so that the sealing rubber shrinks inward to remove the oil and water attached to the surface of the steel wire rope while achieving the sealing effect. Then, the steel wire rope passes through the cleaning space inside the second shell to be steam-cleaned to remove the residual oil stains.

[0017] Step 4: Use the straightening roller to straighten the wire rope to prevent it from tilting and rubbing against the inner wall of the blowout preventer box;

[0018] Step 5: Cycle in sequence, and realize automatic fixing and disconnection of the wire rope blowout preventer box and the pumping tee during each pumping action.

[0019] The present invention provides a quick-release wellhead wire rope blowout prevention box for oil well pumping, which has the following beneficial effects:

[0020] The invention provides a quick clipping device so that the wire rope blowout preventer box can automatically fix and release from the pumping tee only by the weight of the body and the lifting force of the wire rope, thus avoiding the disadvantage that the traditional wire rope blowout preventer box needs manual auxiliary fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is an enlarged schematic diagram of the structure of the quick clip-off device of the present invention.

[0023] Among them, 1. straightening roller; 2. outer shell; 3. sealing rubber; 4. latch tongue; 5. latch tongue spring; 6. impact rod spring; 7. impact rod; 8. impact baffle. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Traditional wire rope blowout preventers need manual assistance to be fixed on the pumping tee, such as binding with wire, or passing a pin of appropriate strength through the pin air. Although some improved blowout preventers also have a tension locking structure, they are not very practical and have problems of inaccurate and loose locking. In the end, manual assistance is still required for fixation. Therefore, the research direction of this technology is to accurately and securely lock the wire without the need for manual or other auxiliary equipment, and to achieve automatic fixation and release.

[0026] Embodiment 1:

[0027] like Figure 1-2 As shown, the embodiment of the present invention provides a quick-release wellhead wire rope blowout prevention box for oil well pumping, comprising a shell 2, a quick-release device is provided at the lower part of the shell 2, and the shell 2 is connected to the pumping three-way card slot through the quick-release device;

[0028] The quick-release device includes a latch tongue 4, which is limited by a convex column and slidably connected to the inside of a transverse slide groove on the lower side wall of the shell 2. The latch tongue 4 is provided with a guide inclined surface at one end away from the central axis of the shell 2 and the middle and lower part of the latch tongue 4. The other end of the latch tongue 4 is fixedly connected to the side wall of the transverse slide groove close to the central axis of the shell 2 by a latch tongue spring 5. The latch tongue spring 5 always pushes the latch tongue 4 laterally to extend to the outside of the transverse slide groove. The transverse dimension of the latch tongue 4 outside the transverse slide groove is smaller than the dimension of the tongue 4 retreating stroke inside the transverse slide groove. A vertical slide groove is provided around the lower end of the shell 2. The inner wall of the vertical slide groove is slidably connected with a striker rod 7. The striker rod 7 is fixedly connected to the upper wall of the vertical slide groove through a striker rod spring 6. The upper end of the striker rod 7 passes through the vertical slide groove and extends to the inside of the transverse slide groove and is located below the guide inclined surface in the middle and lower part of the latch tongue 4. A strike baffle 8 with a central opening is fixedly connected below the striker rod 7.

[0029] The tongue 4 has an inclined guide surface, which is fixed on the main body of the blowout prevention box by a convex column. The tongue spring 5 always pushes the tongue 4 to extend forward horizontally. At the same time, when subjected to an inward lateral force, the tongue spring 5 is compressed to have a travel space to retreat backward, so that the tongue 4 is automatically inserted into the corresponding pumping tee slot, that is, the automatic fixation of the blowout prevention box and the pumping tee is completed. The tongue 4 also has an inclined guide surface in the middle part, which can be hit by the striker 7 to generate a lateral component force to push the tongue 4 back. The striker 7 is fixed on the impact baffle 8 at the bottom and is sleeved in the striker spring 6. The striker spring 6 always keeps the striker 7 in place and does not move with the tongue 4. Once the impact baffle 8 links the striker 7 to compress the striker spring 6 and move upward, a lateral component force is generated under the action of the inclined guide surface to make the tongue 4 retreat, thereby completing the automatic disengagement of the blowout prevention box and the pumping tee.

[0030] By setting up the quick-release device, the wire rope blowout preventer can realize the automatic fixation and release function with the pumping tee only by relying on its body weight and the lifting force of the wire rope, avoiding the disadvantage that the traditional wire rope blowout preventer needs manual auxiliary fixation.

[0031] The housing 2 comprises a first shell, a second shell, a third shell and a fourth shell from top to bottom, which are fixedly connected in sequence by threads.

[0032] By dividing the housing 2 into four parts and connecting them by threads, it is convenient for the inspection and maintenance of the equipment and the replacement of corresponding parts. When a certain part is damaged, only the corresponding damaged part needs to be disassembled and replaced, thereby reducing the maintenance cost.

[0033] A sealing rubber 3 is sleeved inside the third shell and the fourth shell, and the central axis of the sealing rubber 3 passes through from top to bottom and is used to wrap the steel wire rope.

[0034] By setting the sealing rubber 3, the oil and water attached to the surface of the wire rope can be removed, and when the wire rope is pumped, a sealing effect is achieved to avoid oil and dirt spraying out to pollute the external environment.

[0035] The upper part of the sealing rubber 3 is a conical inclined surface, and a raised block is arranged in the middle part of the third housing, and the slope of the block is the same as that of the conical inclined surface of the sealing rubber 3 .

[0036] Since the steel wire rope for traction passes through the sealing rubber 3 in the blowout preventer box and slides frequently in the sealing rubber 3, the sealing rubber 3 wears out quickly and needs to be replaced frequently, which undoubtedly increases the use cost of the blowout preventer box.

[0037] The steel wire rope drives the sealing rubber 3 to move upward and the sealing rubber 3 is limited and compressed by the blocking inclined surface, so that the sealing rubber 3 shrinks inward to remove the oil and water attached to the surface of the steel wire rope while achieving the sealing effect. At the same time, when the steel wire rope falls, the sealing rubber 3 falls back and is no longer limited and compressed by the blocking inclined surface, thereby reducing the friction between the inner wall of the sealing rubber 3 and the steel wire rope, reducing the wear caused by the relative movement of the sealing rubber 3 and the steel wire rope, thereby reducing the wear intensity and frequency of the sealing rubber 3, and achieving the effect of increasing the service life of the sealing rubber 3.

[0038] The sealing rubber 3 is arranged to be split in half along the central axis.

[0039] Although the wear rate of the sealing rubber 3 is reduced by setting the upper part of the sealing rubber 3 to a conical slope and cooperating with the blocking slope, the sealing rubber 3 will still be worn after long-term use until the sealing and cleaning functions are lost. At this time, it is necessary to replace a new sealing rubber 3. Because a steel wire rope is sleeved in the sealing rubber 3, if the sealing rubber 3 is a whole, when replacing it, the steel wire rope needs to be completely pulled out to complete the replacement step. By setting the sealing rubber 3 as two parts separated in half along the central axis, when replacing the sealing rubber 3, it is only necessary to unscrew the third shell and the fourth shell to take out the separated sealing rubber 3, and the replacement of the sealing rubber 3 can be completed without pulling out the steel wire rope.

[0040] The inner cavity of the second shell is a steam cleaning space for cleaning the steel wire rope.

[0041] After the surface of the steel wire rope is cleaned by the sealing rubber 3, some oil stains will remain. At this time, the oil stains remaining on the surface of the steel wire rope can be cleaned by steam cleaning the space inside the second shell.

[0042] A straightening roller 1 is arranged at the upper end of the first housing, and the straightening roller 1 is used for straightening the wire rope.

[0043] During normal operation, the wire rope repeatedly pulls inside the blowout preventer. If the wire rope is skewed, it will cause repeated friction between the wire rope and the inner wall of the blowout preventer, which will not only aggravate the wear of the sealing rubber 3, but also cause long-term friction between the blowout preventer and the wire rope to cause wear and damage. At the same time, the wire rope and the blowout preventer are both made of metal, and sparks may be generated during friction, which is undoubtedly dangerous in an oil and gas environment.

[0044] The inner wall of the housing 2 and the surface of the impact baffle 8 are sprayed with rubber paint.

[0045] By spraying rubber paint on the inner wall of the shell 2 and the surface of the impact baffle 8, a layer of rubber paint protection exists between the wire rope and the spray-proof box. At this time, even if the wire rope is tilted and produces eccentric wear against the inner wall of the spray-proof box, sparks will not be generated due to the barrier of the rubber paint, thereby improving the safety of the spray-proof box during use.

[0046] Embodiment 2:

[0047] Based on the above embodiment, this embodiment provides a method for using a quick-release wellhead wire rope blowout preventer box for oil well pumping, comprising the following steps:

[0048] Step 1: When the wire rope blowout prevention box is used, the quick release device uses the deadweight of the blowout prevention box to make the tongue 4 compress the tongue spring 5 under the action of the guide slope, so that the tongue 4 retracts from the upper edge of the slot of the pumping tee. After passing the upper edge, the tongue 4 is pushed by the tongue spring 5 to extend into the slot of the pumping tee to complete the fixation;

[0049] Step 2: The wire rope is lifted up to drive the rope cap, which hits the impact baffle 8, so that the impact rod 7 moves upward, compresses the impact rod spring 6 and inserts into the lower guide slope of the tongue 4. Under the action of the guide slope, the tongue 4 compresses the tongue spring 5, and the tongue 4 retracts to release the card, and the removal is completed;

[0050] Step 3: When the steel wire rope is pumped at the same time, the steel wire rope drives the sealing rubber 3 to move upward and the sealing rubber 3 is limited and compressed by the blocking inclined surface, so that the sealing rubber 3 shrinks inward to remove the oil and water attached to the surface of the steel wire rope while achieving the sealing effect. Then, the steel wire rope passes through the cleaning space inside the second shell and the surface is cleaned by steam to remove the residual oil stains;

[0051] Step 4: Use the straightening roller 1 to straighten the wire rope to prevent it from tilting and eccentrically wearing against the inner wall of the blowout preventer box;

[0052] Step 5: Cycle in sequence, and realize automatic fixing and disconnection of the wire rope blowout preventer box and the pumping tee during each pumping action.

[0053] Through the above steps, by using a wire rope blowout preventer provided with a quick clamping and releasing device, it is achieved that the wire rope blowout preventer can be automatically fixed and released from the pumping tee only by relying on the weight of the wire rope blowout preventer itself and the upward lifting force of the wire rope, thereby avoiding the disadvantage that the traditional wire rope blowout preventer needs manual auxiliary fixing.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick-release wellhead wire rope blowout prevention box for oil well pumping, comprising a housing (2), characterized in that: A quick-release device is provided at the lower part of the shell (2), and the shell (2) is connected to the three-way card slot of the pumping device through the quick-release device; the quick-release device fixes the wire rope blowout prevention box and the three-way card slot of the pumping device through the deadweight of the blowout prevention box, and the quick-release device disengages the wire rope blowout prevention box from the three-way card slot of the pumping device through the upward force of the wire rope; The quick-release device comprises a latch tongue (4), which is limited by a convex column and slidably connected to the inside of a transverse slide groove on the lower side wall of the housing (2), and the end of the latch tongue (4) away from the central axis of the housing (2) and the lower part of the latch tongue (4) are both provided with a guide inclined surface, and the other end of the latch tongue (4) is fixedly connected to the side wall of the transverse slide groove close to the central axis of the housing (2) through a latch tongue spring (5), and the latch tongue spring (5) always pushes the latch tongue (4) laterally to extend outside the transverse slide groove, and the latch tongue (4) is located at the transverse The lateral dimension toward the outside of the slide groove is smaller than the dimension of the return stroke of the latch (4) toward the inside of the lateral slide groove. Vertical slide grooves are arranged around the lower end of the shell (2). The inner wall of the vertical slide groove is slidably connected with a striker rod (7). The striker rod (7) is fixedly connected to the upper wall of the vertical slide groove through a striker rod spring (6). The upper end of the striker rod (7) passes through the vertical slide groove and extends to the inside of the lateral slide groove and is located below the lower guide inclined surface of the latch (4). An impact baffle (8) with a central opening is fixedly connected below the striker rod (7).

2. The quick-release wellhead wire rope blowout prevention box for oil well pumping according to claim 1 is characterized in that: The outer shell (2) comprises, from top to bottom, a first shell, a second shell, a third shell and a fourth shell, which are fixedly connected in sequence by means of threads.

3. The quick-release wellhead wire rope blowout prevention box for oil well pumping according to claim 2 is characterized in that: A sealing rubber (3) is sleeved inside the third shell and the fourth shell, and the central axis of the sealing rubber (3) passes through from top to bottom and is used to wrap the steel wire rope.

4. The quick-release wellhead wire rope blowout prevention box for oil well pumping according to claim 3 is characterized in that: The upper part of the sealing rubber (3) is a conical inclined surface, and a raised block is provided in the middle of the third housing, and the slope of the block inclined surface is the same as that of the conical inclined surface of the sealing rubber (3).

5. The quick-release wellhead wire rope blowout prevention box for oil well pumping according to claim 4 is characterized in that: The sealing rubber (3) is arranged to be split in half along the central axis.

6. The quick-release wellhead wire rope blowout prevention box for oil well pumping according to claim 5, characterized in that: The inner cavity of the second shell is a steam cleaning space for cleaning the steel wire rope.

7. The quick-release wellhead wire rope blowout prevention box for oil well pumping according to claim 6, characterized in that: A straightening roller (1) is provided at the upper end of the first shell, and the straightening roller (1) is used for straightening the steel wire rope.

8. The quick-release wellhead wire rope blowout prevention box for oil well pumping according to claim 7, characterized in that: The inner wall of the shell (2) and the surface of the impact baffle (8) are sprayed with rubber paint.

9. The method for using the quick-release wellhead wire rope blowout prevention box for oil well pumping according to claim 8 is characterized in that: The following steps are involved: Step 1: When the wire rope blowout prevention box is used, the quick release device uses the deadweight of the blowout prevention box to cause the tongue (4) to compress the tongue spring (5) under the action of the guide slope, so that the tongue (4) is retracted from the upper edge of the slot of the pumping tee. After passing the upper edge, the tongue (4) is pushed by the tongue spring (5) to extend into the slot of the pumping tee to complete the fixation. Step 2: The wire rope is pulled upward to drive the rope cap to hit the impact baffle (8), so that the impact rod (7) moves upward, compresses the impact rod spring (6) and inserts into the lower and middle guide slope of the latch tongue (4). Under the action of the guide slope, the latch tongue (4) compresses the latch tongue spring (5), and the latch tongue (4) retracts to release the card, and the removal is completed; Step 3: When the steel wire rope is pumped at the same time, the steel wire rope drives the sealing rubber (3) to move upward and the sealing rubber (3) is limited and compressed by the blocking inclined surface, so that the sealing rubber (3) shrinks inward to remove the oil and water attached to the surface of the steel wire rope while achieving the sealing effect. The steel wire rope passes through the internal cleaning space of the second shell and the surface is cleaned by steam to remove the residual oil stains; Step 4: Use the straightening roller (1) to straighten the wire rope to prevent it from tilting and rubbing against the inner wall of the blowout preventer box; Step 5: Cycle in sequence, and realize automatic fixing and disconnection of the wire rope blowout preventer box and the pumping tee during each pumping action.

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