CN2665347Y

CN2665347Y - Hydraulic tubing anchor

Info

Publication number: CN2665347Y
Application number: CN 03245291
Authority: CN
Inventors: 张宝有
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-17
Filing date: 2003-04-17
Publication date: 2004-12-22
Anticipated expiration: 2013-04-17

Abstract

A hydraulic oil tubing anchor mainly solves the problem that the existing oil tubing anchor is in packing success rate and poor in self-lock effect. The utility model is characterized in that an upper locking block (3) is clamped and held between a lower locking block (4) and a protective jacket (2) that are arranged outside a central tube (1); wedge locking teeth (9) that are mutually wedged are respectively arranged on the internal and external sides of the upper and lower locking blocks (3, 4); the lower end surface of the upper locking block (3) is wedged on a convex platform of a wedge block (4) outside the central tube (1) that contacts the lower locking block (3); the mutually contact surfaces between upper and lower locking blocks (3, 4), the central tube (1) and the protective jacket (2) are sealed through a packing (8). The utility model has the advantages of high packing success rate and good self-locking effect.

Description

Hydraulic tubing anchor

Technical field:

The utility model relates to underground work instrument, especially hydraulic tubing anchor used in the oil recovery field, oil field.

Background technology:

In oil recovery field, oil field, tubing string play up and down when preventing oil pumping machine oil pumping, usually on the tubing string above the oil well pump, connect tubing anchor, generally be to adopt fluid power to carry out reverse self-locking between voussoir on the tubing anchor and the anchor tooth sheet, when underground work sets, suppress and set with pump truck, when the oil pipe inside and outside differential pressure reduces, anchorage force between anchor tooth sheet and the tubing string is reduced, cause and set incessantly, make tubing anchor lose due effect, tubing anchor sets that success rate is low, the self-locking weak effect, brings loss to production.

The utility model content:

Set in order to overcome existing tubing anchor that success rate is low, the deficiency of self-locking weak effect, the utility model provides a kind of hydraulic tubing anchor, and this tubing anchor has the success rate of setting height, self-locking good effectiveness.

The technical solution of the utility model is: this hydraulic tubing anchor comprises central tube, sheath, voussoir and top connection, be fixed with central tube and sheath inside and outside the top connection lower end respectively, lock dog in the clamping between following lock dog that central tube is outer and the sheath, the outside has the wedge-lock tooth that can block mutually respectively in the lock dog up and down, it is outer and touch down mutually on the boss of voussoir of lock dog that last lock dog lower surface is stuck in central tube, and lock dog, central tube and sheath are in contact with one another and use packing_seal between the face up and down.

The above-mentioned cross section of lock dog up and down is respectively " L " shape and rectangle; Following lock dog is fixed on the central tube by screw thread.

The utlity model has following beneficial effect: owing to take such scheme, water under high pressure when setting in the central tube promotes lock dog by the hole on the central tube, lock dog is moved downward, and then promotion voussoir, anchor tooth sheet opens and the tubing string grappling, and lock dog locking up and down realizes reverse self-locking without fluid power by structure between voussoir and the anchor tooth sheet simultaneously, set the effect that can not influence this tubing anchor of dwindling of back oil pipe inside and outside differential pressure, set the success rate height, self-locking is effective.

Description of drawings:

Accompanying drawing 1 is a structure sectional view of the present utility model.

1-central tube among the figure, the 2-sheath, the last lock dog of 3-, lock dog under the 4-, the 5-voussoir, 6-anchor tooth sheet, the 7-top connection, the 8-packing, 9-locks tooth.

The specific embodiment:

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1, this hydraulic tubing anchor comprises central tube 1, sheath 2, voussoir 5 and top connection 7, be fixed with central tube 1 and sheath 2 inside and outside top connection 7 lower ends respectively, be fixed between outer following lock dog 4 of central tube 1 and the sheath 2 lock dog 3 in the clamping by screw thread, following lock dog 4 is fixed on the central tube 1 by screw thread, lock dog (3,4) cross section is respectively " L " shape and rectangle up and down, and its upper and lower side can slide between sheath 2 and the central tube 1 and between sheath 2 and the following lock dog 4 respectively; The outside has the wedge-lock tooth 9 that can block mutually respectively in the lock dog (3,4) up and down, can lock with following lock dog 4 when last lock dog 3 moves downward the appropriate location; Last lock dog 3 lower surfaces are stuck in that central tube 1 is outer and touch down mutually on the boss of voussoir 5 of lock dog 4, and touch mutually with boss bottom surface, voussoir 5 upper end last lock dog 3 lower surfaces, and last lock dog 3 can promote voussoir 5 and move downward anchor tooth sheet 6 is opened and the tubing string grappling; Lock dog (3 up and down, 4), central tube 1 and sheath 2 are in contact with one another between the face with packing 8 sealings, lock dog (3 just, 4) between, go up between lock dog 3 and the central tube 1, all have packing 8 to seal between sheath 2 and last lock dog 3 and following lock dog 4 and the central tube 1, lock dog (3,4), central tube 1 and sheath 2 surround closed cavity up and down, after last lock dog 3 moves downward the appropriate location, air is compressed in the closed cavity, and last lock dog 3 is formed upward pressure, makes lock dog 3 can not continue motion; This shows that after lock dog (3, the 4) locking, voussoir 5 promptly can not move downward yet and can not move upward, and does not have upper and lower displacement up and down, anchorage force can not reduce between anchor tooth sheet 6 and the tubing string, sets the success rate height, self-locking is effective.

Claims

1, a kind of hydraulic tubing anchor, comprise central tube (1), sheath (2), voussoir (5) and top connection (7), be fixed with central tube (1) and sheath (2) inside and outside top connection (7) lower end respectively, it is characterized in that: lock dog (3) in the clamping between following lock dog (4) that central tube (1) is outer and the sheath (2), lock dog (3 up and down, 4) in, the outside has the wedge-lock tooth (9) that can block mutually respectively, last lock dog (3) lower surface is stuck in outside the central tube (1) and touches down mutually on voussoir (5) boss of lock dog (4), lock dog (3,4) up and down, central tube (1) and sheath (2) are in contact with one another between the face with packing (8) sealing.

2, hydraulic tubing anchor according to claim 1 is characterized in that: lock dog (3,4) cross section is respectively " L " shape and rectangle up and down.

3, hydraulic tubing anchor according to claim 1 is characterized in that: following lock dog (4) is fixed on the central tube (1) by screw thread.