CN217080367U

CN217080367U - Screw pump polished rod lock

Info

Publication number: CN217080367U
Application number: CN202221635478.8U
Authority: CN
Inventors: 潘文厚; 童木目
Original assignee: Shandong Weatherford Highland Artificial Lifting Equipment Co ltd
Current assignee: Shandong Weatherford Highland Artificial Lifting Equipment Co ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-07-29
Anticipated expiration: 2032-06-29

Abstract

The utility model discloses a screw pump polished rod lock, which relates to the technical field of reverse rotation protection devices of screw pump ground driving devices, and comprises an upper slip, a lower slip, a first caliper, a second caliper, a base, a handle, a T-shaped pull rod and a nut, wherein the first caliper and the second caliper are arranged side by side, and the bottoms of the first caliper and the second caliper are fixedly connected with the upper slip; the lower slip is fixedly arranged at the top of the base, the rear ends of the first caliper and the second caliper are hinged with the rear end of the base, the handle is of a tubular structure, is fixed at the front side of the base, has an upper end which is not higher than the top of the base, and is vertical to the slip through hole; the T-shaped pull rod consists of a screw rod and a cylinder at the head part, the screw rod is arranged in the handle in a sliding way, and the lower end of the screw rod is exposed out of the lower end of the handle and is in threaded connection with the nut; when the clamp is in a locking state, the cylinder is pressed on the tops of the first caliper and the second caliper; this device is at the in-process of locking polished rod, realizes through screwing up the nut, keeps away from the polished rod when the staff operates, can not hindered by the clamp.

Description

Screw pump polished rod lock

Technical Field

The utility model relates to a screw pump ground drive reverse protection technical field, concretely relates to screw pump polished rod lock.

Background

The screw pump is one kind of rod pump and has wide application in artificial petroleum lift. The screw pump oil production system is a 'ground driving device-polished rod (sucker rod) -screw pump' type sucker-rod oil pumping system.

When the screw pump ground driving device is normally stopped or the pump is blocked and stopped due to sand content, dead oil and the like, the elastic deformation stored in the rod column can be quickly released, so that the rod column is quickly reversed; meanwhile, under the action of the hydraulic pressure difference between the liquid in the oil pipe and the external oil conveying pipeline and the well in the casing, the screw pump rotor and the rod column connected with the rotor are enabled to rotate reversely rapidly. The larger the oil sleeve pressure difference is, the faster the reversing speed of the rod column is; in addition, if the screw pump has a large displacement and a high lift, the mast stores a large amount of potential energy, which causes the mast to rotate in a violent reverse direction. In the polish rod reversing process, a brake system of the screw pump ground driving device can continuously brake to consume the reversing potential energy in the sucker rod until the reverse rotation is stopped.

After the polish rod stops reversing, a certain reversing torque generally remains in the rod column, and knocking or vibration generated in the maintenance process of an operator can cause the polish rod to reverse again, so that personal injury is easily caused to surrounding personnel.

Chinese patent CN205895161U discloses an anti-reverse device of a screw pump sucker rod, which comprises a pawl disc, a pawl, a torsion spring, a ratchet wheel and a hoop; a plurality of pawls distributed in a circular array are arranged on the pawl disc; a torsion spring is arranged between the pawl and the pawl plate; a ratchet wheel is arranged on one side of the pawl disc; the ratchet wheel is provided with a groove, and when the pawl disc rotates anticlockwise, the pawl is propped in the groove of the ratchet wheel; the ratchet wheel is connected with the hoop; a brake rubber sheet is arranged between the ratchet wheel and the hoop; when the torque is manually released, the device needs to be close to the sucker rod to loosen the locking nut, and personal injury is easily caused to operators.

In view of the above, there is a need to further develop a novel protection device for locking the polish rod after shutdown and before maintenance, so as to limit the reverse rotation of the polish rod and provide safety for operators.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a screw pump polished rod lock to the defect that prior art exists.

The technical scheme of the utility model is that: a screw pump polished rod lock comprises an upper slip, a lower slip, a first caliper, a second caliper, a base, a handle, a T-shaped pull rod and a nut, wherein the first caliper and the second caliper are arranged side by side, the bottoms of the first caliper and the second caliper are fixedly connected with the upper slip, and the first caliper, the lower slip, the first caliper, the second caliper and the nut form a whole; the lower slip is fixedly arranged at the top of the base, the rear ends of the first caliper and the second caliper are hinged with the rear end of the base, and when the upper slip and the lower slip are closed, the inner sides of the upper slip and the lower slip are matched to form a slip through hole for the smooth rod to pass through;

the handle is of a tubular structure, is vertically fixed on the front side of the base, has the upper end not higher than the top of the base, and is perpendicular to the slip through hole; the T-shaped pull rod is composed of a screw rod and a cylinder at the head, the screw rod is arranged in the handle in a sliding mode, and the lower end of the screw rod is exposed out of the lower end of the handle and is in threaded connection with the nut; when the clamp is in a locking state, the cylinder is pressed on the tops of the first caliper and the second caliper; when the first caliper and the second caliper are opened upward, the cylinder can penetrate between the first caliper and the second caliper.

Preferably, the brake caliper further comprises a cam and a closing hook, the cam is fixed at the rear end of the second caliper, the middle part of the closing hook is rotatably installed on the base, and when the first caliper and the second caliper are opened upwards, the cam presses downwards and pushes the upper part of the closing hook to enable the closing hook to rotate anticlockwise.

Preferably, the middle part of the closing hook is rotatably installed on the base through a bolt, and when the closing hook is in a locking state, the closing hook is attached to the base.

Preferably, the inner sides of the upper slip and the lower slip are both processed with annular or spiral grooves.

Preferably, the top of the first caliper and the second caliper is provided with a groove matched with the cylinder.

Compared with the prior art, the utility model, have following advantage:

after the ground driving device is stopped, the polished rod is locked by the device, so that a safe working environment is provided for maintenance personnel; the device is realized by screwing the nut in the process of locking the polished rod, and a worker is far away from the polished rod during operation and cannot be injured by clamping; the device locks the polish rod, can limit the reverse rotation of the rod string, can bear the axial weight of the sucker rod string and prevent the rod string from loosening in the maintenance process; the device has compact integral structure and simple and convenient use and maintenance.

Drawings

Fig. 1 is a schematic view of the locking state of the present invention;

FIG. 2 is a schematic view of the usage state of the present invention;

FIG. 3 is a schematic view showing a T-shaped pull rod pushed upward;

fig. 4 is a schematic view of the first and second calipers in an upwardly open state.

In the figure: 1. the device comprises an upper slip, 2, a lower slip, 3, a first caliper, 4, a second caliper, 5, a base, 6, a handle, 7, a T-shaped pull rod, 701, a screw, 702, a cylinder, 8, a nut, 9, a cam, 10, a closing hook, 11, a bolt, 12 and a groove.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example one

Referring to fig. 1, the novel screw 701 pump polished rod lock comprises an upper slip 1, a lower slip 2, a first caliper 3, a second caliper 4, a base 5, a handle 6, a T-shaped pull rod 7 and a nut 8, wherein the first caliper 3 and the second caliper 4 are arranged side by side, the bottoms of the first caliper 3 and the second caliper 4 are fixedly connected with the upper slip 1, and the first caliper, the second caliper, the upper slip and the lower slip form a whole; the lower slip 2 is fixedly arranged at the top of the base 5, the rear ends of the first caliper 3 and the second caliper 4 are hinged with the rear end of the base 5, and when the upper slip 1 and the lower slip 2 are closed, the inner sides of the upper slip 1 and the lower slip 2 are matched to form a slip through hole for the light rod to pass through;

the handle 6 is of a tubular structure, is vertically fixed on the front side of the base 5, has the upper end not higher than the top of the base 5, and is vertical to the slip through hole; the T-shaped pull rod 7 consists of a screw rod 701 and a cylindrical body 702 at the head part, the screw rod 701 is arranged in the handle 6 in a sliding way, and the lower end of the screw rod is exposed out of the lower end of the handle 6 and is in threaded connection with the nut 8; when in the locked state, the cylinder 702 is pressed on top of the first caliper 3 and the second caliper 4; when the first caliper 3 and the second caliper 4 are opened upwards, the cylinder 702 can pass between them.

In more detail, the present embodiment further includes a cam 9 and a closing hook 10, the cam 9 is fixed at the rear end of the second caliper 4, the middle portion of the closing hook 10 is rotatably installed on the base 5, and when the first caliper 3 and the second caliper 4 are opened upward, the cam 9 presses down and pushes the upper portion of the closing hook 10, so that the closing hook 10 rotates counterclockwise.

The ground driving device is arranged at the upper part of the support frame, and the packing box is connected with the support frame; the lower end of the packing box is connected to an upper flange of the oil extraction wellhead, and the packing box and the upper flange are sealed through a steel ring; the polish rod passes through the packing box and a hollow output shaft of the screw 701 pump ground driving device; the support frame has several stands, and when ground drive arrangement shut down, this device of installation between the stand of support frame:

1) as shown in fig. 3, the device is taken out, the nut 8 is loosened, and the t-shaped pull rod 7 is pushed upwards to make the cylinder 702 parallel to the side surfaces of the first caliper 3 and the second caliper 4;

2) as shown in fig. 4, when the first caliper 3 and the second caliper 4 are opened from the closed position, the first caliper 3 and the second caliper 4 are opened upwards, the cam 9 is driven to rotate around the hinge point, the cam 9 presses downwards and pushes the upper part of the closing hook 10, and the closing hook 10 is driven to rotate anticlockwise; pulling the lower end of the T-shaped pull rod 7 to make the cylinder 702 contact with the upper end of the handle 6;

3) installing the device, holding the closing hook 10, and closing the first caliper 3 and the second caliper 4; after the polish rod is clamped by the lower slip 2 and the upper slip 1, the nut 8 is tightened, the nut 8 tightens the T-shaped pull rod 7, the cylinder 702 compresses the tops of the first caliper 3 and the second caliper 4, and the first caliper 3 and the second caliper 4 drive the upper slip 1 and the lower slip 2 to clamp the polish rod; after the polish rod is clamped by the upper slip 1 and the lower slip 2, the handle 6 is limited by the support frame and cannot rotate, so that the aim of limiting the reverse rotation of the polish rod is fulfilled;

4) after the ground driving device is maintained and overhauled, the device is disassembled.

After the ground driving device is stopped, the polished rod is locked by the device, so that a safe working environment is provided for maintenance personnel; in the process of locking the polished rod, the device is realized by screwing the nut 8, so that a worker is far away from the polished rod during operation and cannot be injured by clamping; the device locks the polish rod, can limit the reverse rotation of the rod string, can bear the axial weight of the sucker rod string and prevent the rod string from loosening in the maintenance process; the device has compact integral structure and simple and convenient use and maintenance.

Example two

As a preferred embodiment of the present invention, the present embodiment adds the groove 12 on the basis of the first embodiment at the top of the first caliper 3 and the second caliper 4, and optimizes the setting of the closing hook 10, specifically:

referring to fig. 1, in the present embodiment, the top of the first caliper 3 and the second caliper 4 are provided with a groove 12 fitted with a cylinder 702; when the device is in the locked state, the cylinder 702 of the tie rod 7 can be placed in the groove 12 of the first caliper 3 and the second caliper 4.

In addition, the middle part of the closing hook 10 is rotatably mounted on the base 5 by means of a bolt 11, and when in the locked state, the closing hook 10 is attached to the base 5, which arrangement is in accordance with the operating habit and ergonomic design.

EXAMPLE III

As an embodiment of the present invention, the present embodiment optimizes the structure of the upper slip 1 and the lower slip 2 on the basis of the second embodiment, and specifically, the present embodiment is:

in the embodiment, annular or spiral grooves are processed on the inner sides of the upper slip 1 and the lower slip 2; when the device is in a locking state, the annular or spiral groove can promote the locking force and the friction force of the upper slip 1 and the lower slip 2 to the polish rod.

The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the spirit of the present invention, and the changed contents still belong to the protection scope of the present invention.

Claims

1. The utility model provides a screw pump polished rod lock, includes slips and slips down, its characterized in that: the clamping device comprises a clamping device, a clamping device and a clamping device, and is characterized by further comprising a first clamp, a second clamp, a base, a handle, a T-shaped pull rod and a nut, wherein the first clamp and the second clamp are arranged side by side, the bottoms of the first clamp and the second clamp are fixedly connected with an upper slip, and the first clamp, the second clamp, the handle, the T-shaped pull rod and the nut form a whole; the lower slip is fixedly arranged at the top of the base, the rear ends of the first caliper and the second caliper are hinged with the rear end of the base, and when the upper slip and the lower slip are closed, the inner sides of the upper slip and the lower slip are matched to form a slip through hole for the smooth rod to pass through;

2. The screw pump polished rod lock of claim 1, wherein: the clamp comprises a base, a first caliper and a second caliper, and is characterized by further comprising a cam and a closing hook, wherein the cam is fixed at the rear end of the second caliper, the middle of the closing hook is rotatably installed on the base, and when the first caliper and the second caliper are opened upwards, the cam presses downwards and pushes the upper portion of the closing hook to enable the closing hook to rotate anticlockwise.

3. A screw pump polished rod lock according to claim 2, characterized in that: the middle part of the closing hook is rotatably installed on the base through a bolt, and when the closing hook is in a locking state, the closing hook is attached to the base.

4. The screw pump polished rod lock of claim 1, wherein: and annular or spiral grooves are processed on the inner sides of the upper slip and the lower slip.

5. The screw pump polished rod lock of claim 1, wherein: the top of first calliper and second calliper is equipped with the recess with the cylinder adaptation.