CN210217681U

CN210217681U - Blowout prevention control tool for oil pumping unit wellhead

Info

Publication number: CN210217681U
Application number: CN201920664358.2U
Authority: CN
Inventors: Weicheng Liang; 梁伟成; Chuang Liang; 梁闯
Original assignee: Liaoning Xinhua Instruments Co Ltd
Current assignee: Liaoning Xinhua Instruments Co Ltd
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-03-31
Anticipated expiration: 2029-05-10

Abstract

A blowout control tool for a wellhead of an oil pumping unit comprises an eccentric ball seat, a ball body and a bias adjusting cap, and is characterized in that the lower end of the ball body is hinged with a blowout control cover plate; a lower packing rubber pad is arranged on the inner hole of the ball body, positioning pins are arranged at the upper end and the lower end of the sealing main body, and a middle packing rubber pad is arranged on the inner hole separation boss of the sealing main body; a wave spring B is arranged on a separation boss of the pressing sleeve, and an upper coil rubber pad is arranged at the upper part of a spring seat; an upper pressing sleeve is arranged on the upper side of the upper packing rubber pad, and a wave spring A is arranged at the upper part of the upper pressing sleeve; the upper part of the pressing sleeve is in threaded connection with an adjusting sleeve, and a spring pressing cap positioned at the upper end of the wave spring A is in threaded connection with the adjusting sleeve. The utility model discloses can carry out two-way spring compensation to the packing rubber pad, show the life who improves the packing rubber pad, reduce the damage of polished rod, solve the problem of ternary well polished rod scale deposit, adopt multistage sealing system to avoid saving the expenditure because of the well plugging device well-killing operation that arouses, improve the productivity.

Description

Blowout prevention control tool for oil pumping unit wellhead

Technical Field

The utility model belongs to the oil recovery well instrument, especially a control means is prevented spouting by beam-pumping unit well head.

Background

At present, the pumping unit well adopts a wellhead sealing device to seal the space around a polished rod, and the sealing material is mostly O-shaped packing or spiral packing. The tightness of the packing is required to be regulated and controlled frequently in the using process, but the tightness regulation has great influence on the sealing state and the energy consumption due to equipment and personnel factors. Meanwhile, when the polish rod goes down, wind sand is brought into the packing box, so that the packing is abraded at an accelerated speed and the polish rod is seriously damaged. When the pumping unit well is used for replacing a wellhead sealing packing, the packing in the packing box is replaced after the well is sealed by a well plugging device. After the blowout preventer is used for a certain period of time, the sealing rubber part of the blowout preventer is aged and worn, so that the blowout preventer is not tight. The wellhead can not be sealed when the packing is replaced, and the packing can not be replaced, so that the wellhead needs to be maintained. And the shut-in well killing needs to be carried out when the well plugging device is maintained every time, so that the time and the labor are wasted, and the yield and the material consumption are influenced. In addition, the well head polish rod is broken to cause blowout, which causes great pollution to the environment.

SUMMERY OF THE UTILITY MODEL

The utility model aims at above problem, provide a control tool is prevented spouting by beam-pumping unit well head, the device can carry out two-way spring compensation to the packing rubber pad, compensate the packing rubber pad only in the not enough of upper portion wearing and tearing, is showing the life who improves the packing rubber pad, reduces the damage of polished rod, solves the problem of ternary well polished rod scale deposit, adopts multistage sealing system to avoid because of the well plugging device not well-used circulation kill-job operation that arouses, saves the expenditure, improves the productivity.

The utility model adopts the technical scheme as follows: including eccentric ball seat, spheroid, regulation bias voltage cap, characterized by: the lower end of the inner hole of the ball body is provided with a sealed O-shaped rubber ring and is connected with a blowout prevention cover plate through a hinge shaft; the upper part of the sphere is integrally connected with a sleeve, a nylon sleeve is embedded in an inner hole of the sphere, a lower packing rubber pad is arranged on the upper surface of the nylon sleeve in the sleeve, and a lower pressing sleeve is arranged on the lower packing rubber pad; the upper part of the sleeve and the lower part of the pressing sleeve are connected together through an external sealing main body by screw threads, and positioning pins are arranged at the upper end and the lower end of the sealing main body and are respectively positioned in positioning grooves of the pressing sleeve and the sleeve; a separation boss is arranged on an inner hole of the sealing main body, a lower pressing sleeve is arranged in a pressing sleeve inner hole positioned above the separation boss, and a middle packing rubber pad is arranged on the lower pressing sleeve; a separation boss is arranged in an inner hole of the pressing sleeve, a nylon sleeve is arranged on the separation boss, a wave spring B is arranged on the upper portion of the nylon sleeve, a nylon spring seat is arranged on the upper portion of the wave spring B, and a hanging root rubber pad is arranged on the upper portion of the nylon spring seat; an upper pressing sleeve is arranged on the upper disc root rubber pad, and a dust removal and scale prevention pad made of bamboo fiber materials is inlaid in an inner hole of the upper pressing sleeve; a spring seat is arranged at the upper part of the upper pressing sleeve, and a wave spring A is assembled on the spring seat; the upper part of the pressing sleeve is in threaded connection with an adjusting sleeve, a spring pressing cap positioned at the upper end of the wave spring A is in threaded connection with the adjusting sleeve, and an inner hole of the spring pressing cap is inlaid with a righting pad; the adjusting sleeve is welded with a handle.

The utility model discloses an actively the effect: the device adopts the two dish springs that wave form spring A and B constitute, and two dish springs are corresponding to carry out elasticity compensation to the intermediate position, compensate the packing rubber pad only in the not enough of upper portion wearing and tearing, show the life who strengthens the packing rubber pad to antifriction consumption reduction has also played very big effect to the beam-pumping unit. The service cycle of the packing rubber pad is prolonged, the damage of the polish rod is reduced, the problem of scaling of the polish rod of the ternary well is solved, and the service life of the packing rubber pad is prolonged. The multistage sealing system avoids the circular well killing operation caused by the poor use of the well plugging device, saves the expenditure and improves the productivity. The device adopts tertiary sealing system, has reduced circulation kill-job operation. The principle is as follows: normal production adopts the one-level earlier sealed (last cover, last packing root rubber pad, pressure cover to constitute), closes the second grade when treating that the one-level seal is inefficacy sealed (pressing cover, sealed main part, well packing root rubber pad, pressing cover A to constitute down), changes the one-level seal, in the long-term use, then closes tertiary seal (sealed main part, pressing cover B, lower packing root rubber pad, spheroid constitution) after the sealed not tight appearing in the second grade seal, changes the second grade seal.

The bottom deviation adjusting structure is a double deviation adjusting structure (the radial position and the angle of a tool are adjusted by matching the ball body with the eccentric ball seat, so that the center of the wellhead sealing device of the pumping unit is consistent with the center of the polished rod, one side of the packing rubber pad is not eccentrically worn, the using effect and the safety and environmental protection are enhanced, and the positive effect is achieved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Number in the figure: the device comprises a spring pressing cap 1, a centering pad 2, a wave spring A3, a spring seat 4, a handle 5, an adjusting sleeve 5-1, an upper pressing sleeve 6, a dust-removing and scale-preventing pad 7, an upper packing rubber pad 8, a nylon spring seat 9, a pressing sleeve 10, a wave spring B11, a nylon sleeve A12, an upper positioning pin 13, a separation boss 14, a sealing main body 15, a middle packing rubber pad 16, a lower pressing sleeve A17, a lower pressing sleeve B18, a lower positioning pin 19, a lower packing rubber pad 20, a nylon sleeve B21, a separation boss 22, a bias-adjusting cap 23, an O-shaped rubber ring 24, a sphere 25, a sleeve 25-1, an eccentric ball seat 26, a blowout-preventing cover plate 27 and an O-shaped rubber ring 28.

Detailed Description

Referring to fig. 1, the specific structure is as follows: a ball 25 is arranged on the eccentric ball seat 26 at the lowest end, a sealed O-shaped rubber ring 24 is arranged between the outer spherical surface of the ball 25 and the eccentric ball seat 26, and the upper part of the eccentric ball seat 26 is in threaded connection with a bias adjusting cap 23, so that the moving space of the ball 25 is limited; a sealed O-shaped rubber ring 28 is arranged at the lower end of an inner hole of the ball 25, and is connected with a blowout prevention cover plate 27 through a hinge shaft, and the lower part of the blowout prevention cover plate 27 is provided with an angle; the upper part is integrally connected with a sleeve 25-1, and a nylon sleeve 21 is embedded in an inner hole of the sphere 25; three groups of lower packing rubber pads 20 are arranged on the nylon sleeve 21 in the sleeve 25-1, and a lower pressing sleeve B18 is arranged on the lower packing rubber pads 20; the upper part of the sleeve 25-1 is connected with the lower part of the pressing sleeve 10 through an external sealing main body 15 in a threaded manner, the upper end and the lower end of the sealing main body 15 are connected with

positioning pins

13 and 19 in a threaded manner, and the inner ends of the two

positioning pins

13 and 19 are respectively positioned in positioning grooves of the pressing sleeve 10 and the sleeve 25-1; a separation boss 22 is arranged on an inner hole of the sealing main body 15, a lower pressing sleeve 17 is arranged on an inner hole of the pressing sleeve 10 positioned on the separation boss 22, and four groups of packing rubber pads 16 are arranged on the lower pressing sleeve 17; a separation boss 14 is arranged in an inner hole of the pressing sleeve 10, a nylon sleeve 12 is arranged on the separation boss 14, a wave spring B11 is arranged at the upper part of the nylon sleeve 12, a nylon spring seat 9 is arranged at the upper part of a wave spring B11, and six groups of upper disk rubber pads 8 are arranged at the upper part of the nylon spring seat 9; an upper pressing sleeve 6 is arranged on the upper disk root rubber pad 8, and a dust removal and scale prevention pad 7 made of bamboo fiber material is inlaid in an inner hole of the upper pressing sleeve 6; a spring seat 4 is arranged at the upper part of the upper pressing sleeve 6, and a wave spring A3 is assembled on the spring 4; the upper part of the pressing sleeve 10 is in threaded connection with an adjusting sleeve 5-1, a spring pressing cap 1 positioned at the upper end of a wave spring A3 is in threaded connection with the adjusting sleeve 5-1, and an inner hole of the spring pressing cap 1 is inlaid with a centering pad 2 to play a role in centering a polished rod; a handle 5 is welded on the adjusting sleeve 5-1.

Principle of operation

1. Referring to fig. 1, a spring pressing cap 1, a centering pad 2, a wave spring A3, a spring seat 4, a handle 5, an adjusting sleeve 5-1, an upper pressing sleeve 6 and a dust-removing and anti-scaling pad 7 are combined together to be called a packing box pressing cap assembly.

When the packing box pressing cap assembly is used, certain pressure is generated on the internal wave spring A3 through adjusting the spring pressing cap 1, and then the pressing degree of the upper packing rubber pad 8 is controlled through the rotating handle 5, so that the wave spring A3 generates relatively constant pressure on the packing rubber pad in a certain compression state. Along with the abrasion of the packing rubber pad, the spring capacity of the wave-shaped spring A3 can gradually release potential energy, and the sealing under reasonable pretightening force is kept. Meanwhile, the centering pad 2 on the upper part of the spring pressing cap 1 has strong wear resistance and lubricity, and the inner diameter of the centering pad is only slightly larger than that of the polish rod, so that the centering effect is achieved in the process of up-and-down operation of the polish rod, and the eccentric wear of the polish rod, the packing rubber pad 8 and the spring pressing cap 1 is avoided. Through the inside dust removal scale control pad (bamboo fiber material) of packing box spring pressure cap, stop that the polished rod brings into the packing box when sand blown by the wind down, can avoid sand blown by the wind to the accelerated wear of packing rubber pad and the polished rod causes serious damage, through above function, this packing box pressure cap has wholly realized reducing motor active power, extension packing rubber pad, polished rod life, extension packing rubber pad adjustment, change cycle's purpose. The sealing principle of the wellhead sealing device is that the packing rubber pad is longitudinally compressed and transversely expanded to realize elastic sealing with the polish rod.

2. A second and third sealing structure: at ordinary times, the second-level sealing and the third-level sealing are in a normal loosening state, all have positioning pins to fasten and prevent misoperation, once the first packing rubber gasket is compressed tightly and still cannot be sealed, the positioning pin 13 at the second-level sealing position is loosened by rotating a tool, and the upper pressing sleeve 6 is pressed to generate extrusion force in the downward axial displacement, so that the middle sealing packing rubber gasket 16 is expanded to realize well sealing. And under the condition that the upper and lower two stages are failed, loosening the positioning pin 19 at the three-stage sealing position by rotating a tool to seal the well, and simultaneously replacing the first packing rubber pad and the second packing rubber pad.

3. The bottom deviation adjusting structure is a double deviation adjusting structure (the radial position and the angle of a tool are adjusted by matching the sphere 25 and the eccentric ball seat 26, so that the center of a wellhead sealing device of the pumping unit is consistent with the center of a polish rod), and the deviation adjusting range of 15mm at the maximum is realized by the eccentricity of the sphere 25 and the eccentric ball seat 26.

4. The ball 25, the eccentric ball seat 26 and the blowout-preventing cover plate 27 form a blowout-preventing device, and wellhead blowout prevention can be effectively realized under the condition that a rod is broken and detached (the principle is that once a polished rod of the pumping unit is broken and detached, liquid in a well can impact the blowout-preventing cover plate 27 to turn upwards to be matched with the lower end of an inner hole of the ball 25 to close a middle channel, and the lower part of the blowout-preventing cover plate 27 is provided with an angle, so that the channel can be automatically turned upwards to close when oil is.

Claims

1. The utility model provides a control tool is prevented spouting by beam-pumping unit well head, includes eccentric ball seat, spheroid, the regulation and bias voltage cap, characterized by: the lower end of the inner hole of the ball body is provided with a sealed O-shaped rubber ring and is connected with a blowout prevention cover plate through a hinge shaft; the upper part of the sphere is integrally connected with a sleeve, a nylon sleeve is embedded in an inner hole of the sphere, a lower packing rubber pad is arranged on the upper surface of the nylon sleeve in the sleeve, and a lower pressing sleeve is arranged on the lower packing rubber pad; the upper part of the sleeve and the lower part of the pressing sleeve are connected together through an external sealing main body by screw threads, and positioning pins are arranged at the upper end and the lower end of the sealing main body and are respectively positioned in positioning grooves of the pressing sleeve and the sleeve; a separation boss is arranged on an inner hole of the sealing main body, a lower pressing sleeve is arranged in a pressing sleeve inner hole positioned above the separation boss, and a middle packing rubber pad is arranged on the lower pressing sleeve; a separation boss is arranged in an inner hole of the pressing sleeve, a nylon sleeve is arranged on the separation boss, a wave spring B is arranged on the upper portion of the nylon sleeve, a nylon spring seat is arranged on the upper portion of the wave spring B, and a hanging root rubber pad is arranged on the upper portion of the nylon spring seat; an upper pressing sleeve is arranged on the upper disc root rubber pad, and a dust removal and scale prevention pad made of bamboo fiber materials is inlaid in an inner hole of the upper pressing sleeve; a spring seat is arranged at the upper part of the upper pressing sleeve, and a wave spring A is assembled on the spring seat; the upper part of the pressing sleeve is in threaded connection with an adjusting sleeve, a spring pressing cap positioned at the upper end of the wave spring A is in threaded connection with the adjusting sleeve, and an inner hole of the spring pressing cap is inlaid with a righting pad; the adjusting sleeve is welded with a handle.