CN210195707U

CN210195707U - Well anti-jacking blowout-preventing tool

Info

Publication number: CN210195707U
Application number: CN201920602891.6U
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: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-03-27
Anticipated expiration: 2029-04-29

Abstract

A water well anti-jacking blowout prevention tool comprises an upper joint, an upper outer sleeve, a lower outer sleeve and a central pipe, and is characterized in that a lock sleeve is in threaded connection between the upper outer sleeve and the lower outer sleeve, a turning plate seat is fixedly connected at the lower end of the upper joint, and the turning plate is connected with the turning plate seat through a pin shaft and a torsion spring; key grooves which are opposite to each other are formed on the inner surface of the lock sleeve and the outer surface of the central tube; the front end of the key sleeve is provided with a key matched with the key groove of the lock sleeve and the central tube, and the key sleeve is connected to the central tube through a pin; the L-shaped groove is arranged on the outer surface of the central tube, the key is processed on the inner surface of the lock sleeve, and the key of the lock sleeve is positioned at the innermost end of the L-shaped groove of the central tube to axially lock the L-shaped groove and the lock sleeve. The utility model is used for the blowout prevention of the oil pipe for the secondary operation of the well, is connected to the upper end of the packer or the upper end of the injection allocation device, can be used in multiple stages, and can seal the oil pipe to achieve the blowout prevention function; the phenomenon of pipe jacking caused by overhigh bottom pressure is prevented; meets the requirement of environmental protection and improves the working environment. Meanwhile, the operation is simple.

Description

Well anti-jacking blowout-preventing tool

Technical Field

The utility model belongs to an oil production well equipment, especially a well prevents that top prevents spouting instrument.

Background

Along with further deepening of oil-gas field development, oil-water wells of oil fields are maintained more and more frequently, and then measures for preventing blowout in secondary operation oil pipes of water injection wells are particularly prominent, and modes such as secondary blowout prevention ball seats, plug throwing devices, anti-backflow injection allocation devices and the like are mainly adopted for many years. However, because the down-hole tool of the water injection well has long service time, particularly scaling and sand accumulation are easily caused in polymer injection and ternary wells, the secondary blowout prevention ball seat can not be released; the plug throwing device also needs to be cleaned with water, well washing and well pressing; the anti-reflux injection allocation device has the phenomena of no effect after scaling and the like. In summary, these conventional tools increase the number of working steps, thus increasing the working period and the working cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above problems, and provides a well anti-ejection blowout prevention tool, which is used for the oil pipe blowout prevention of the secondary operation of a well, is connected to the upper end of a packer or the upper end of an injection allocation device, can be used in multiple stages, and can seal the oil pipe to achieve the blowout prevention function during the secondary operation; the tool is connected to the upper end of the packer, has the pressure relief function and prevents the phenomenon of pipe jacking caused by overhigh bottom pressure; the pollution on the ground is reduced to the maximum extent, the environmental protection requirement is met, and the operation environment is improved.

The utility model aims at realizing through the following technical scheme: including the top connection, go up the overcoat, overcoat and center tube, characterized by down: a pressure relief hole is processed on the upper outer sleeve, the lower end of the upper outer sleeve is connected with a lock sleeve in a threaded manner, and the lower end of the lock sleeve is connected with the lower outer sleeve; the turning plate seat is fixedly connected with the lower end of the upper connector, and the pin shaft penetrates through the torsion spring to connect the turning plate with the turning plate seat; key grooves are processed on the inner surface of the lock sleeve and the outer surface of the central tube, and the key grooves of the lock sleeve and the central tube are arranged oppositely; a key sleeve is arranged between the central tube and the lock sleeve, the front end of the key sleeve is provided with a key matched with the lock sleeve and the key groove of the central tube, and the key sleeve is connected to the central tube through a pin; two opposite L-shaped grooves are processed on the outer surface of the central tube, two symmetrical keys are processed on the inner surface of the lock sleeve, and the keys of the lock sleeve are positioned at the innermost ends of the two opposite L-shaped grooves of the central tube to axially lock the two L-shaped grooves.

And a baffle ring is arranged on the central tube below the key sleeve, the baffle ring is in threaded connection with the central tube, and end face teeth are processed at the lower end of the baffle ring.

The utility model discloses an actively the effect: the tool is used for blowout prevention of an oil pipe for secondary operation of a water well, is connected to the upper end of a packer or the upper end of an injection allocation device and can be used in multiple stages, and the oil pipe can be sealed to achieve the blowout prevention function only by lifting a pipe column in a forward rotation mode for 1-2 circles during the secondary operation; the tool is connected to the upper end of the packer to have a pressure relief function, if the packer cannot be unsealed, high-pressure liquid on the lower portion of the packer can be discharged into a sleeve on the upper portion of the packer, so that the upper pressure and the lower pressure of the packer are balanced, and the phenomenon of pipe jacking caused by overhigh bottom-hole pressure is prevented; meanwhile, only a small amount of liquid in the oil pipe is brought to the ground in the pipe column lifting process and is sucked away by the sewage suction truck, so that the pollution to the ground is reduced to the maximum extent, the requirement on the aspect of environmental protection is met, and the operating environment is also improved. Meanwhile, the operation is simple.

Drawings

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

Fig. 2 is a sectional view a-a of fig. 1.

Fig. 3 is a sectional view B-B of fig. 1.

Fig. 4 is a cross-sectional view C-C of fig. 1.

Fig. 5 is a schematic structural view of the upper end of the center rod engaged with the lock sleeve.

Fig. 6 is a cross-sectional view of the lock sleeve.

Fig. 7 is a cross-sectional view taken along line D-D of fig. 6.

Fig. 8 is a cross-sectional view E-E of fig. 6.

Fig. 9 is a schematic view of the connection structure of the upper joint and the turning plate.

Part numbers in the drawings: the device comprises an upper connector 1, an upper outer sleeve 2, a screw 3, a turning plate seat 4, a torsion spring 5, a pin shaft 6, a turning plate 7, a lock sleeve 8, a lower outer sleeve 9, a key sleeve 10, a pin 11, a baffle ring 12 and a central tube 13.

Detailed Description

Referring to fig. 1 and 9, a pressure relief hole D is formed in the upper outer sleeve 2, the upper end of the upper outer sleeve 2 is connected with the upper joint 1 through a thread, the lower end of the upper outer sleeve 2 is connected with the lock sleeve 8 through a thread, and the lower end of the lock sleeve 8 is connected with the lower outer sleeve 9; the turning plate seat 4 is fixed at the lower end of the upper joint 1 through a screw 3, and the pin shaft 6 penetrates through the torsion spring 5 to connect the turning plate 7 with the turning plate seat 4; the contact position of the lock sleeve 8 and the central tube 13 is sealed by a sealing rubber ring. Referring to fig. 1, 4 and 5, four keyways are formed in the inner surface of the lock sleeve 8 and the outer surface of the central tube 13 (the keyways 8-2 in the inner surface of the lock sleeve 8 are shown in fig. 8), and the keyways of the two keyways are arranged oppositely; a key sleeve 10 is arranged between the central tube 13 and the lock sleeve 8, and four keys 10-1 matched with four key slots 8-2 of the lock sleeve 8 and four key slots H (figure 5) of the central tube 13 are processed at the front end of the key sleeve 10; the key sleeve 10 is connected to a central tube 13 through two pins 11 which are opposite in the circumferential direction; sealing rings are arranged between the key sleeve 10, the lock sleeve 8 and the central pipe 13. 1-3, 5, two opposite L-shaped grooves F (see FIG. 5) are machined in the outer surface of the center tube 13; referring to fig. 6-8, two symmetrical keys 8-1 are formed on the inner surface of the lock sleeve 8, and the keys 8-1 of the lock sleeve 8 are positioned at the innermost ends of two opposite L-shaped grooves of the central tube 13 to axially lock the two. Four key slots 8-2 are also processed on the inner surface of the lock sleeve 8 and are arranged opposite to the four key slots on the outer surface of the central tube 13; referring to fig. 1, a baffle ring 12 is arranged on a central tube 13 below a key sleeve 10, the baffle ring 12 is in threaded connection with the central tube 13, end face teeth E are processed at the lower end of the baffle ring 12, when the upper joint 1 is lifted up, the lower outer sleeve 9 is lifted up along with the baffle ring, and the teeth E on the lower end face of the baffle ring can increase the friction force after contacting with the inner side of the lower end of the lower outer sleeve 9, so that the transmission of torque is ensured.

The working principle is as follows:

1. will when lower tubular column the utility model discloses connect in the top of packer top or injection allocation ware, the tubular column is down to behind the predetermined degree of depth, presses the seat packer, cuts pin 11 simultaneously and makes key sleeve 10 go down with lock sleeve 8 and center tube 13 unblock, guarantees that top connection 1 can rotate.

2. When the pipe column is lifted by the secondary operation, after the pipe column rotates forwards for 1-2 circles, the key 8-1 of the lock sleeve 8 rotates from the inner end of the L-shaped groove F to the notch and then lifts up, the lower end of the upper joint 1 is separated from the upper end of the central pipe 13, the turning plate 7 turns over for 90 degrees under the action of the torsion spring 5, a channel at the lower end of the upper joint 1 is sealed, and high-pressure fluid is prevented from being sprayed out of the oil pipe; if the packer of this stage fails to be deblocked smoothly, then the high-pressure fluid of this stage of packer lower part can reach the balance of upper and lower pressure through pressure release hole D in leaking to packer upper portion sleeve pipe, prevents to produce the push pipe accident because of pressure differential is too big.

3. When the uppermost stage of the tool is pulled out of the wellhead, the pipe column is rotated forward for 1-2 circles again and then lifted, the next stage of blowout preventer is closed, and the operation is performed in sequence until all the pipe columns are pulled out, so that each stage of blowout prevention can be guaranteed, and the requirement of environment-friendly operation is met.

Claims

1. The utility model provides a well prevents that top prevents spouting instrument, includes the top connection, goes up the overcoat, overcoat and center tube down, characterized by: a pressure relief hole is processed on the upper outer sleeve, the lower end of the upper outer sleeve is connected with a lock sleeve in a threaded manner, and the lower end of the lock sleeve is connected with the lower outer sleeve; the turning plate seat is fixedly connected with the lower end of the upper connector, and the pin shaft penetrates through the torsion spring to connect the turning plate with the turning plate seat; key grooves are processed on the inner surface of the lock sleeve and the outer surface of the central tube, and the key grooves of the lock sleeve and the central tube are arranged oppositely; a key sleeve is arranged between the central tube and the lock sleeve, the front end of the key sleeve is provided with a key matched with the lock sleeve and the key groove of the central tube, and the key sleeve is connected to the central tube through a pin; two opposite L-shaped grooves are processed on the outer surface of the central tube, two symmetrical keys are processed on the inner surface of the lock sleeve, and the keys of the lock sleeve are positioned at the innermost ends of the two opposite L-shaped grooves of the central tube to axially lock the two L-shaped grooves.