Sealing device for oil pumping polish rod of oil pumping well

Abstract

The utility model relates to a pumping well oil pumping polish rod sealing device which comprises a base used for being connected with a pumping well mouth, a lower centralizing sleeve is inserted in an upper end opening of the base, a packing box is arranged at the upper end of the base in a seated mode, the bottom end of the packing box adjusts deviation, the base is connected with the base through a union, the upper end and the lower end of the packing box are open, and an upper centralizing sleeve is arranged in the lower end opening. An inserting groove is formed in the upper surface of the upper centralizing sleeve, a guiding ramp is arranged on the back face of the inserting groove, a leading-in pipe is inserted into an upper end opening of the packing box, a pressing cap is connected outside the upper end opening of the packing box in a screwed mode, the upper end of the leading-in pipe penetrates out of the middle of the pressing cap and is connected with a lantern ring in a sleeved mode, and a leading-in groove which is spirally downward is formed in the portion, in the pipe wall of the leading-in pipe, of the packing box. The packing taking and placing device is simple in structure, packing taking and placing are more facilitated, and the sealing performance of the packing is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a sealing device suitable for pumping well, in particular to a pumping well pumping rod sealing device. BACKGROUND

[0002] At present, the pumping well wellhead pumping rod sealing device of the petroleum industry produces running, bleeding, dripping and leaking phenomena after the rubber sealing packing in the packing box is worn for a period of time due to the deviation and reciprocating movement of the pumping rod, and the packing needs to be replaced. The packing adopts trapezoidal belt. During the replacement process, the old packing is pulled out of the packing box, and the new packing is inserted into the packing box through the insertion port. In this process, the packing is inserted into the packing box through the packing insertion port, and after the lower end of the packing touches the bottom of the packing box, the packing will rotate around the pumping rod. With the continuous insertion of the subsequent packing, the packing eventually forms a stacked structure around the pumping rod, so that the pumping rod and the packing box form a seal.

[0003] The defects of this structure are as follows: first, since the lower end of the packing is not fixed, the packing slips between the bottom surface of the packing box, so that the packing between each layer cannot be tightly attached, even under the action of the upper pressure cap, there will still be a gap between the packings, which is not conducive to sealing. Second, the lowermost layer of packing, especially the first section of packing entering the packing box, is very easy to fold at the end because the packing is basically in a vertical state when it is first inserted into the packing box. This makes the bottom layer of packing leave a gap between the bottom surface of the packing box, which is also not conducive to sealing.

[0004] In the prior art, although there are various structures of pumping rod sealing devices for inserting packing, none of them mentions how to solve the problem of not tightly stacking caused by the easy slipping of the bottom end of the packing, and the problem of folding of the bottom end of the packing.

[0005] Therefore, in order to ensure that the packing is orderly placed in the packing box in a spiral manner, it is necessary to design a pumping well pumping rod sealing device that can solve the above problems. SUMMARY

[0006] The present application aims to provide a pumping well pumping rod sealing device that can orderly spiral stack the packing entering the packing box and avoid folding.

[0007] The application is achieved as follows: the sealing device of the pumping well sucker rod, comprising a base for connecting with the well head of the pumping well, a lower centralizing sleeve inserted into the upper port of the base, a packing box on the upper end of the base, the bottom end of the packing box is connected with the base through the oil nipple, the upper and lower ends of the packing box are open, characterized in that: an upper centralizing sleeve is arranged in the lower end opening, the upper surface of the upper centralizing sleeve is provided with a slot, the back of the slot is provided with a guide slope, a guide pipe is inserted into the upper port of the packing box, a pressure cap is screwed on the outside of the upper port of the packing box, the upper end of the guide pipe is penetrated from the middle of the pressure cap and is sleeved with a sleeve ring, a spiral downward guide groove is formed in the pipe wall of the guide pipe in the packing box.

[0008] The guide pipe is a circular pipe with a through hole in the center, the upper end port of the guide groove is flush with the upper end port of the guide pipe, the lower end port of the guide groove is flush with the lower end port of the guide pipe, the guide groove is a spiral channel spirally downward with the axis of the guide pipe as the axis.

[0009] A convex rib is arranged in the middle of the guide pipe and protrudes outward, the convex rib is located between the upper end surface of the pressure cap and the upper port of the packing box, the lower pipe body of the guide pipe located at the lower part of the convex rib is inserted into the upper port of the packing box, the upper pipe body of the guide pipe located at the upper part of the convex rib is stretched out of the pressure cap, the uppermost end of the stretched part is sleeved with a sleeve ring, under the joint action of the sleeve ring and the convex rib, the guide pipe is connected to the pressure cap.

[0010] A first handle is connected to the pressure cap, and the pressure cap is screwed with the packing box.

[0011] The upper centralizing sleeve is an annular sleeve with a through hole in the center, the upper end surface has an inner and outer circumference, the clamping groove includes side plates arranged along the inner and outer circumferences of the upper centralizing sleeve, a top plate is connected between the upper ends of the two side plates, an insertion opening is formed between the two side plates, and the two side plates and the top plate form an insertion slot for the end of the packing to be inserted between the upper end surface of the upper centralizing sleeve.

[0012] A guide slope from high to low is arranged on the side of the insertion slot facing away from the insertion opening, and the upper surface of the guide slope is an arc surface.

[0013] Due to the implementation of the above technical solutions, the clamping groove is arranged on the upper surface of the upper centralizing sleeve, so that the bottom end of the packing is positioned after entering the clamping groove, thereby ensuring that the subsequent packing does not slip after being inserted into the packing box, and the subsequent packing can form a spiral layered structure under stable stress. At the same time, the guide slope is arranged on the back of the clamping groove, so that the packing is in contact with the upper surface of the upper centralizing sleeve at an angle when it is contacted, thereby reducing the probability of folding of the end of the packing. The structure of the application is simple, and it is more convenient to take and place the packing, and the sealing performance of the packing is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] The specific structure of the application is given by the following drawings and examples:

[0015] Fig. 1This is a schematic diagram of the structure of this application;

[0016] Fig. 2 This is a schematic diagram of the structure of this application after the optical rod is inserted;

[0017] Fig. 3 This is a schematic diagram of the upper straightening sleeve with a card slot according to this application.

[0018] Legend: 1. Collar, 2. Inlet tube, 2-1. Inlet groove, 3. Pressure cap, 3-1. First handle, 4. Packing box, 4-1. Adjustment base, 5. Upper straightening sleeve, 6. Lower straightening sleeve, 7. Base, 8. Sealing ring, 9. Oil ring, 9-1. Second handle, 10. Slot, 10-1.11. Smooth rod, 12. Packing, 13. Guide ramp. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] Example: Figs. 1-3 As shown, the oil well sucker rod sealing device includes a base 7 for connecting to the wellhead of the oil well. A lower centering sleeve 6 is inserted into the upper port of the base 7. A packing box 4 is mounted on the upper end of the base 7. The bottom adjustment base 4-1 of the packing box 4 is connected to the base 7 through an oil joint 9. The packing box 4 has openings at both the upper and lower ends. An upper centering sleeve 5 is provided in the lower opening. A slot 10 is provided on the upper surface of the upper centering sleeve 5. A guide ramp 13 is provided on the back of the slot 10. An inlet pipe 2 is inserted into the upper port of the packing box 4. A pressure cap 3 is screwed onto the outside of the upper port of the packing box 4. The upper end of the inlet pipe 2 passes through the middle of the pressure cap 3 and is fitted with a collar 1. A spiral downward inlet groove 2-1 is opened in the packing box 4 inside the wall of the inlet pipe 2.

[0022] Further, the guide pipe 2 is a circular pipe with a through hole in the center, the upper end of the guide groove 2-1 is flush with the upper end of the guide pipe 2, the lower end of the guide groove 2-1 is flush with the lower end of the guide pipe 2, and the guide groove 2-1 is a spiral channel spiraling downward with the axis of the guide pipe 2 as the axis. This structure changes the force applied when the packing is inserted into the guide pipe 2 from a vertical force to an inclined force, so that the packing can be inserted with a smaller force. At the same time, the direction of the packing entering is changed, so that the upper layer of packing can be stacked with the lower layer of packing at a smaller angle, reducing the probability of packing folding.

[0023] Further, a convex rib is arranged in the middle of the guide pipe 2, the convex rib is located between the upper end surface of the pressure cap 3 and the upper end of the packing box 4, the lower part of the guide pipe 2 is inserted into the upper end of the packing box 4, the upper part of the guide pipe 2 extends out of the pressure cap 3, the uppermost end of the extension part is sleeved with the sleeve ring 1, and the guide pipe 2 is connected to the pressure cap 3 under the joint action of the sleeve ring 1 and the convex rib.

[0024] Further, the first handle 3-1 is connected to the pressure cap 3, the pressure cap 3 is a cylinder with an open lower end, an opening is arranged in the center of the upper end surface, and an inner thread is arranged in the open lower end to match the outer thread of the upper end of the packing box 4. By rotating the pressure cap 3, the pressure on the pressure cap 3 can be adjusted, so that the guide pipe 2 can be compressed, the lower end of the guide pipe 2 can press the packing 12, and the tightness between the layers of the packing 12 can be ensured.

[0025] Further, the structure of the packing box 4 and the base 7 is a prior art, which will not be described in detail.

[0026] Further, the upper centralizing sleeve 5 is an annular sleeve with a through hole in the center, the upper end surface has an inner and outer circumference, the clamping groove 10 includes side plates 10-2 arranged along the inner and outer circumferences of the upper centralizing sleeve 5, a top plate 10-1 is connected between the upper ends of the two side plates 10-2, a socket 10-3 is formed between the two side plates 10-2, and the two side plates 10-2 and the top plate 10-1 form an insertion slot with the upper end surface of the upper centralizing sleeve 5 for inserting the end of the packing 12.

[0027] Further, a guide slope 13 is arranged on the side of the insertion slot 10 away from the socket 10-3, the guide slope 13 has a high end and a low end, and the upper surface of the guide slope 13 is an arc surface, preferably a downward curved arc surface. The high end of the guide slope 13 blocks the back opening of the insertion slot 10.

[0028] In actual use, the guide slope 13 is preferably arranged directly below the lower end of the guide groove 2-1.

[0029] In use of the application, the base 7 and the lower centralizing sleeve 6 are first installed in place, then the coil box 4 is seated on the upper end surface of the base, and then the oil nipple 9 is sleeved on the upper side of the coil box 4, the oil nipple 9 is rotated by the second handle 9-1 connected to the oil nipple 9, the oil nipple 9 is screwed with the base 7, so that the coil box 4 is fixed on the base 7. Then the inlet pipe 2 is inserted into the upper port of the coil box 4, and then the pressure cap 3 is sleeved on the inlet pipe 2, and finally the sleeve ring 1 is connected to the upper part of the inlet pipe 2. At this time, as shown in the figure, the polished rod 11 is inserted from the lower end of the base 7 and finally inserted from the upper end of the inlet pipe 2, and the installation is completed. Fig. 2

[0030] When the coil 12 is loaded, one end of the coil 12 is inserted into the coil box 4 through the inlet groove 2-1, and when the lower end of the coil 12 contacts the upper centralizing sleeve 5, it first contacts the guide slope 13, at this time the coil 12 changes from vertical to inclined along the guide slope 13, and with the insertion of the subsequent coil 12, the lower end of the coil 12 moves along the upper centralizing sleeve 5 until it is inserted into the insertion slot 10, and then the subsequent coil 12 begins to gradually form a spiral layer, until the coil box 4 is full. By providing the insertion slot 10 on the upper surface of the upper centralizing sleeve 5, the bottom end of the coil 12 is positioned after entering the insertion slot 10, so that the bottom layer of the coil 12 does not slip after the subsequent coil 12 is inserted into the coil box 4, so that the subsequent coil 12 can form a spiral layer structure under stable stress. At the same time, the guide slope 13 is provided on the back of the insertion slot 10, so that the coil 12 changes from vertical contact to inclined angle contact when contacting the upper surface of the upper centralizing sleeve 5, thereby reducing the probability of folding of the end of the coil 12.

[0031] The above technical features constitute an embodiment of the application, which has strong adaptability and implementation effect, and unnecessary technical features can be added or reduced according to actual needs to meet the needs of different situations.​

Claims

1. A sealing device for the polished rod of an oil well, comprising a base for connecting to the wellhead of the oil well, a lower centering sleeve inserted into the upper port of the base, a packing box seated on the upper end of the base, an adjustment base at the bottom end of the packing box connected to the base via an oil connector, and openings at both the upper and lower ends of the packing box, characterized in that: The upper centralizing sleeve is arranged in the lower end opening, and an insertion slot is arranged on the upper surface of the upper centralizing sleeve, and a guide slope is arranged on the back of the insertion slot.

2. The sucker rod seal apparatus of claim 1, wherein: The guide pipe is a circular pipe with a through hole in the center, the upper end of the guide pipe is connected with the upper end of the guide slot, the lower end of the guide slot is connected with the lower end of the guide pipe, and the guide slot is a spiral channel spirally downward with the axis of the guide pipe as the axis.

3. The sucker rod polished rod seal apparatus of claim 2, wherein: A convex rib is arranged on the middle part of the guide pipe, the convex rib is located between the upper end surface of the pressure cap and the upper port of the disc winding box, the lower pipe body of the guide pipe is inserted into the upper port of the disc winding box, the upper pipe body of the guide pipe is extended upward beyond the pressure cap, the uppermost end of the extended part is sleeved with a sleeve ring, and the guide pipe is connected to the pressure cap under the joint action of the sleeve ring and the convex rib.

4. The sucker rod seal apparatus of claim 2 or 3, wherein: A first handle is connected to the pressure cap, and the pressure cap is rotatably connected to the disc winding box.

5. The sucker rod seal apparatus of claim 1 or 2 or 3, wherein: The upper centralizing sleeve is a ring-shaped sleeve with a through hole in the center, the upper end surface has an inner and outer circumference, the clamping slot includes side plates arranged along the inner and outer circumferences of the upper centralizing sleeve, a top plate is connected between the upper ends of the two side plates, an insertion port is formed between the two side plates, and the two side plates and the top plate form an insertion slot for inserting the end of the disc winding.

6. The sucker rod seal apparatus of claims 1 or 2 or 3 or 5, wherein: A guide slope is arranged on the back of the insertion slot, and the upper surface of the guide slope is an arc surface.

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