Pumping unit wellhead polish rod sealer device with blowout prevention function without stopping well

Abstract

The utility model discloses a pumping unit well mouth polish rod sealer device with a blowout prevention function without stopping a well, and relates to the technical field of oil and gas well equipment polish rod sealing, the pumping unit well mouth polish rod sealer device comprises a blowout preventer, a deviation adjusting device, a blowout preventer and a packing box which are sequentially connected from bottom to top, the upper portion of an inner cavity of the blowout preventer is a piston cavity, and a pressure piston is installed in the piston cavity in an up-down sliding and sealing mode; a step seat is arranged on the inner wall of the blowout preventer corresponding to the middle of the blowout preventer; a pressure channel and a pressure relief channel are formed in the pipe wall of the blowout preventer, and valve rods for controlling switches are arranged in the middle of the pressure channel and the middle of the pressure relief channel. The packing box comprises a packing box body, the upper end of the outer wall of the pressure piston is in sliding fit with the inner wall of the packing box body, and colloidal packing is filled in an annular space between the packing box body on the upper side of the pressure piston and the polish rod. The side surface of the packing box body is connected with packing pipes; according to the device, the colloidal filler is used for replacing a traditional packing and can be gradually consumed in the using process, so that in the using process, only the consumed filler needs to be filled, a well does not need to be stopped, and the production efficiency is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of polished rod sealing of oil and gas well equipment, and in particular to a polished rod sealing device for a wellhead of a pumping unit with a blowout prevention function while the well is being kept open. Background Art

[0002] In my country's oil production, wells with rod pumps account for more than 80% of all oil wells. The bare rod sealer is a component that seals the wellhead of the well. When the pump drives the bare rod to reciprocate up and down, the bare rod rubs against the packing of the sealer back and forth, and the packing is quickly worn out, causing oil leakage from the wellhead. The higher the water content of the oil well, the more serious this phenomenon is, resulting in frequent replacement of the packing. The well must be stopped every time the packing is replaced. It usually takes 30 minutes to an hour to replace the packing, which increases the labor intensity of on-site operators and causes production losses. Summary of the invention

[0003] The purpose of the present invention is to provide a wellhead polished rod sealer device for a pumping unit with a blowout prevention function without stopping the well in view of the defects in the prior art.

[0004] The technical scheme of the present invention is: a wellhead bare rod sealer device of a pumping unit with a blowout prevention function without stopping the well, comprising a well sealer, a deviation adjustment device, a blowout preventer and a stuffing box connected in sequence from bottom to top, the upper part of the inner cavity of the blowout preventer is a piston cavity, a pressure piston is installed in the piston cavity for sliding sealing up and down, and a step seat is provided on the inner wall of the blowout preventer corresponding to the middle thereof; a pressure channel and a pressure relief channel are opened in the pipe wall of the blowout preventer, the upper ends of the pressure channel and the pressure relief channel are both located on the step seat, the lower end of the pressure channel is located in the middle of the inner cavity of the blowout preventer, and the lower end of the pressure relief channel is located on the outer wall of the blowout preventer, and the middle parts of the two are provided with valve stems for controlling switches; the outer ends of the two valve stems are provided with hand wheels;

[0005] The stuffing box comprises a stuffing box body, the upper end of the outer wall of the pressure piston is slidably matched with the inner wall of the stuffing box body, and the annulus between the stuffing box body on the upper side and the bare rod is filled with stuffing; a stuffing tube is connected to the side of the stuffing box body, and a stuffing box cap is detachably installed on the outer end of the stuffing tube.

[0006] Preferably, two stuffing tubes are connected to the side of the stuffing box body, and the two stuffing tubes are horizontally arranged along the external tangent direction of the stuffing box body.

[0007] Preferably, it also includes an upper gland, which includes a gland body and a gland core shaft, the inner wall of the gland body is provided with an internal thread, which is threadedly connected to the upper end of the stuffing box body; the upper end of the gland core shaft is fixedly installed at the center of the gland body, and its outer wall is slidably matched with the inner wall of the stuffing box body;

[0008] A retaining ring which is slidably connected with the outer wall of the polished rod is installed at the center of the top of the pressure piston and in the inner cavity of the gland core shaft.

[0009] Preferably, the lower part of the blowout preventer inner cavity is a ball retention cavity, and a blowout preventer ball is arranged in the ball retention cavity.

[0010] Preferably, the filler is in a colloidal state and is formed by mixing waste belt crushed material with molybdenum disulfide.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] This device uses colloidal packing to replace traditional packing, which will be gradually consumed during use. Therefore, it only needs to fill the consumption during use without stopping the well, ensuring production efficiency; the pressure piston is used for automatic compression compensation of packing wear, so that the packing in the packing box always maintains a constant pressure compression state. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 is a top cross-sectional schematic diagram of the stuffing box body;

[0015] Figure 3 A cross-sectional schematic diagram of a blowout preventer.

[0016] In the figure: 1, well plugging device, 2, deviation adjustment device, 3, blowout preventer, 301, piston chamber, 302, ball retention chamber, 303, step seat, 4, stuffing box body, 5, pressure piston, 6, pressure channel, 7, pressure relief channel, 8, valve stem, 9, hand wheel, 10, stuffing tube, 11, stuffing box cap, 12, gland body, 13, gland core shaft, 14, retaining ring, 15, blowout preventer ball. DETAILED DESCRIPTION

[0017] The present invention is further described below with reference to the accompanying drawings and embodiments. Embodiment 1

[0018] Reference Figure 1 and Figure 3As shown, a wellhead bare rod sealer device of a pumping unit with a blowout prevention function without stopping the well is provided, comprising a well sealer 1, a deviation adjustment device 2, a blowout preventer 3 and a stuffing box connected in sequence from bottom to top, the upper part of the inner cavity of the blowout preventer 3 is a piston cavity 301, a pressure piston 5 is installed in the piston cavity 301 for upward and downward sliding sealing, and a step seat 303 is provided on the inner wall of the blowout preventer 3 corresponding to the middle thereof; a pressure channel 6 and a pressure relief channel 7 are opened in the pipe wall of the blowout preventer 3, the upper ends of the pressure channel 6 and the pressure relief channel 7 are both located on the step seat 303, the lower end of the pressure channel 6 is located in the middle of the inner cavity of the blowout preventer 3, and the lower end of the pressure relief channel 7 is located on the outer wall of the blowout preventer 3, and a valve stem 8 for controlling a switch is provided in the middle of both; and a hand wheel 9 is provided at the outer ends of the two valve stems 8.

[0019] The lower part of the inner cavity of the blowout preventer 3 is a ball retention cavity 302, in which a blowout preventer ball 15 is arranged. During normal operation, the blowout preventer ball 15 stays in the ball retention cavity 302. When the polished rod is broken, the upper polished rod will fall into the well. The blowout preventer ball 15 located in the ball retention cavity 302 is sucked into the inner cavity of the blowout preventer 3 body due to the negative pressure of the downhole high-pressure oil. The downhole high-pressure oil lifts the blowout preventer ball 15 and presses it against the lower side of the blowout sleeve, thereby blocking the oil outlet channel, preventing oil and water from continuing to spray upward, reducing pollution to the surrounding environment, and ensuring operation safety.

[0020] The stuffing box includes a stuffing box body 4, the upper end of the outer wall of the pressure piston 5 is slidably matched with the inner wall of the stuffing box body 4, and the annulus between the stuffing box body 4 and the bare rod on its upper side is filled with colloidal filler; a stuffing tube 10 is connected to the side of the stuffing box body 4, and a stuffing box cap 11 is detachably installed on the outer end of the stuffing tube 10.

[0021] The filler is a material made by mixing scrap belt crusher and molybdenum disulfide in proportion, so it only needs to be consumed during use, and a special sealing filler gun can be used for filling.

[0022] It also includes an upper pressure cover, which includes a pressure cover body 12 and a pressure cover core shaft 13. The inner wall of the pressure cover body 12 is provided with an internal thread, which is threadedly connected to the upper end of the stuffing box body 4; the upper end of the pressure cover core shaft 13 is fixedly installed at the center of the pressure cover body 12, and its outer wall is slidably matched with the inner wall of the stuffing box body 4; a retaining ring 14 slidably connected to the outer wall of the light rod is installed at the center of the top of the pressure piston 5 and in the inner cavity of the pressure cover core shaft 13.

[0023] This device uses colloidal packing to replace traditional packing, which will be gradually consumed during use, so it only needs to fill the consumed part during use; in normal production, the pressure channel 6 is opened and the pressure relief channel 7 is closed, and the downhole high-pressure oil gives an upward force to the pressure piston 5 through the pressure channel 6, so that the pressure piston 5 squeezes the packing upward, which is used for automatic compression compensation of packing wear, so that the packing in the packing box always maintains a constant pressure compression state.

[0024] When the stuffing box needs stuffing, without stopping the well, turn the hand wheel 9 of the valve stem 8 of the pressure channel 6 to close the pressure channel 6, turn the hand wheel 9 of the valve stem 8 of the pressure relief channel 7 to open the pressure relief channel 7, so that the pressure piston 5 can be depressurized, and then manually rotate the upper gland to the uppermost end; load the sealing stuffing into the manual stuffing gun, and then thread the stuffing gun with the stuffing pipe 10, manually rotate the screw of the stuffing gun to squeeze the sealing stuffing into the stuffing box; after filling the stuffing, remove the stuffing gun and install the stuffing box cap 11; finally, rotate the upper gland to the best position as needed, open the pressure channel 6, and close the pressure relief channel 7. At this time, the wellhead bare rod sealer device of the pumping unit works normally. When oil leakage occurs at the wellhead, the upper gland needs to be manually rotated downward to cooperate with the pressure piston 5 to compress the stuffing.

[0025] The device uses colloidal packing to replace traditional packing, which will be gradually consumed during use. Therefore, it only needs to fill the consumption during use without stopping the well, ensuring production efficiency; the pressure piston 5 is used for automatic compression compensation of packing wear, so that the packing in the packing box always maintains a constant pressure compression state. Embodiment 2

[0026] As a preferred embodiment of the present invention, this embodiment optimizes the structure of the stuffing box on the basis of the first embodiment, specifically:

[0027] Reference Figure 2 As shown, in this embodiment, two stuffing tubes 10 are connected to the side of the stuffing box body 4, and the two stuffing tubes 10 are horizontally arranged along the external tangent direction of the stuffing box body 4, so that when the stuffing is injected, the bare rod has no obstruction to the stuffing.

[0028] The present invention is not limited to the above-mentioned embodiments. Various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention. The changed contents still fall within the protection scope of the present invention.

Claims

1. A wellhead polished rod sealer device for a pumping unit with a blowout prevention function without stopping the well, characterized in that: It comprises a well plugging device, a deviation adjusting device, a blowout preventer and a stuffing box connected in sequence from bottom to top, the upper part of the inner cavity of the blowout preventer is a piston cavity, a pressure piston is installed in the piston cavity in an upward and downward sliding and sealing manner, and a step seat is provided on the inner wall of the blowout preventer corresponding to the middle part; a pressure channel and a pressure relief channel are opened in the blowout preventer pipe wall, the upper ends of the pressure channel and the pressure relief channel are both located on the step seat, the lower end of the pressure channel is located in the middle of the inner cavity of the blowout preventer, and the lower end of the pressure relief channel is located on the outer wall of the blowout preventer, and the middle parts of the two are provided with valve stems for controlling switches; the outer ends of the two valve stems are provided with hand wheels; The stuffing box comprises a stuffing box body, the upper end of the outer wall of the pressure piston is slidably matched with the inner wall of the stuffing box body, and the annulus between the stuffing box body on the upper side and the bare rod is filled with stuffing; a stuffing tube is connected to the side of the stuffing box body, and a stuffing box cap is detachably installed on the outer end of the stuffing tube.

2. The apparatus for sealing the wellhead polished rod of a pumping unit with a blowout prevention function without stopping the well according to claim 1, characterized in that: Two stuffing tubes are connected to the side of the stuffing box body, and the two stuffing tubes are horizontally arranged along the external tangent direction of the stuffing box body.

3. The wellhead polished rod sealer device of a pumping unit with a blowout prevention function without stopping the well according to claim 1, characterized in that: It also includes an upper gland, which includes a gland body and a gland core shaft. The inner wall of the gland body is provided with an internal thread, which is threadedly connected to the upper end of the stuffing box body; the upper end of the gland core shaft is fixedly installed at the center of the gland body, and its outer wall is slidably matched with the inner wall of the stuffing box body; A retaining ring which is slidably connected with the outer wall of the polished rod is installed at the center of the top of the pressure piston and in the inner cavity of the gland core shaft.

4. The wellhead polished rod sealer device for a pumping unit with a blowout prevention function without stopping the well according to claim 1, characterized in that: The lower part of the blowout preventer inner cavity is a ball retention cavity, and a blowout preventer ball is arranged in the ball retention cavity.

5. The wellhead polished rod sealer device for a pumping unit with a blowout prevention function without stopping the well according to claim 1, characterized in that: The filler is in a gelatinous state.

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