Traceless polish rod clamp for rod-pumped well

Abstract

The utility model belongs to the technical field of sucker rod clamping pieces, and particularly relates to a traceless polish rod clamp for a rod-pumped well, which comprises a clamp and a fastener, the clamp is a whole formed by hinging the top of a left half clamp and the top of a right half clamp, and a holding part for holding a polish rod is arranged at the staggered position of the left half clamp and the hinged position of the right half clamp and the hinged position of the left half clamp and the right half clamp. The holding part comprises grooves which are correspondingly formed in the left half clamp and the right half clamp respectively and used for being buckled on the polish rod, protrusions with pressing faces matched with the surface of the polish rod are arranged in the grooves, and the protrusions in the grooves of the left half clamp and the right half clamp are staggered; the fastener is used for fixing the left half clamp and the right half clamp to the position where the polished rod is tightly held through the protruding pressing faces. Due to the fact that the protruding pressing faces in the grooves of the left half clamp and the right half clamp are the cylindrical faces matched with the surface of the polish rod, obvious pressing marks cannot be generated on the surface of the polish rod, a file does not need to be frequently used for polishing the polish rod again, abrasion of the polish rod is slowed down, and the service life of the polish rod is prolonged.

Description

Technical Field

[0001] The utility model relates to a traceless polished rod clamp for an oil pumping well, belonging to the technical field of oil pumping rod clamping parts. Background Art

[0002] During the production process of oil wells, operations such as pump collision and anti-thrust distance adjustment are often required. For example, the technical solutions disclosed in the Chinese utility model patent authorization announcement texts with authorization announcement numbers CN211201900U, CN205977130U and CN203626645U generally use a tooth-type rod clamp to clamp the rod so that the oil well load is unloaded to the wellhead packing box. The tooth shape of the clamp adopts a millimeter-level pitch sawtooth ring buckle, which is easy to bite the rod. After each operation, the clamp will leave deep tooth marks on the rod, which need to be removed with a file. Long-term accumulation will reduce the diameter of the rod and shorten the service life of the rod. It will also cause the sealing performance of the rod seal ring to decrease, and even cause oil leakage in the wellhead packing box, affecting safe production. In addition, when the diameter of the rod is reduced to a certain extent, the rod needs to be replaced, which increases the workload and economic losses. Utility Model Content

[0003] The utility model aims to provide a non-marking polished rod clamp for a pumping well, so as to solve the problem that the existing tooth-type polished rod clamp may cause deep indentations on the polished rod.

[0004] To achieve the above-mentioned purpose, the utility model provides a seamless polished rod clamp for a pumping well, comprising a clamp and a fastener, the clamp being an integral body formed by hinged connection of the top of a left half clamp and the top of a right half clamp, a clamping portion for clamping the polished rod is arranged at a position staggered from the hinge of the left half clamp and the right half clamp, the clamping portion comprising grooves respectively formed on the left half clamp and the right half clamp for buckling on the polished rod, a protrusion having a pressing surface matching the surface of the polished rod is arranged in the groove, and the protrusions in the grooves of the left half clamp and the right half clamp are staggered with each other; the fastener is used to fix the left half clamp and the right half clamp in a position where the polished rod is clamped by the pressing surface of the protrusion.

[0005] Furthermore, the groove intervals between the protrusions in the left half clamp groove and the protrusions in the right half clamp groove are opposite, and the groove intervals between the protrusions in the right half clamp groove and the protrusions in the left half clamp groove other than the protrusions are opposite.

[0006] Furthermore, the size of the protrusions in the left half clamp groove along the axial direction of the polished rod is smaller than the spacing between the protrusions in the right half clamp groove, and the size of the protrusions in the right half clamp groove along the axial direction of the polished rod is smaller than the spacing between the protrusions in the left half clamp groove.

[0007] Furthermore, two edges of the protrusion in the left half clamp groove in the axial direction of the polished rod and two edges of the protrusion in the right half clamp groove in the axial direction of the polished rod are staggered with each other.

[0008] Furthermore, there are two protrusions in each of the left half clamp groove and the right half clamp groove.

[0009] Furthermore, one end of the left half clamp groove is a protrusion, and the other end is the groove interval; the end of the right half clamp groove that is the same as the end of the protrusion in the left half clamp groove is the groove interval, and the other end is the protrusion.

[0010] Furthermore, the fastener comprises a bolt with a nut hinged at the bottom of the left half clamp, and a slot opened at the bottom of the right half clamp for accommodating the bolt, and the size of the nut is larger than the size of the slot.

[0011] Furthermore, the groove is a semicircular arc groove.

[0012] Beneficial effects of the utility model:

[0013] The raised pressing surfaces in the grooves 8 of the left half clamp 1 and the right half clamp 2 of the clamp of the polished rod clamp of the utility model are semi-cylindrical surfaces that match the side surfaces of the polished rod. Therefore, during construction, the polished rod will not be clamped without causing obvious indentations on the surface of the polished rod, and there is no need to frequently use a file to re-polish the polished rod, which reduces the wear of the polished rod and extends the service life of the polished rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the assembly structure of the traceless polished rod clamp for a pumping well of the utility model;

[0015] FIG2( a ) is a schematic diagram of the side structure of the left half of the clamp of the present invention;

[0016] FIG2( b ) is a schematic diagram of the front structure of the left half of the clamp of the present invention;

[0017] FIG3( a ) is a front structural schematic diagram of the right half clamp of the present invention;

[0018] FIG3( b ) is a schematic diagram of the side structure of the right half of the clamp of the present invention;

[0019] FIG4( a ) is a partially cutaway front structural schematic diagram of a T-bolt of the present invention;

[0020] FIG4( b ) is a schematic diagram of the side structure of the T-bolt of the present invention;

[0021] FIG5( a ) is a schematic side cross-sectional view of the nut of the present invention;

[0022] FIG5( b ) is a schematic diagram of the front structure of the nut of the present invention;

[0023] Figure 6 The utility model is a schematic diagram of the open state of the left half clamp and the right half clamp of the oil pumping well seamless polished rod clamp.

[0024] Description of reference numerals:

[0025] 1. Left half clamp; 2. Right half clamp; 3. Pin; 4. T-bolt; 5. Nut; 6. Protrusion; 7. Groove interval; 8. Groove; 9. First hinge hole of left half clamp; 10. Second hinge hole of left half clamp; 11. Hinge hole of right half clamp; 12. Notch; 13. Bolt hinge hole. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0027] Embodiment 1:

[0028] like Figure 1 As shown, a non-marking polished rod clamp for a pumping well of this embodiment includes a left half clamp 1 and a right half clamp 2, the tops of the left half clamp 1 and the right half clamp 2 are hinged, and the bottoms can be locked or released by a T-bolt 4 as a fastener. The left half clamp 1 and the right half clamp 2 respectively form two grooves 8 at the middle position between the top and the bottom, and the two grooves 8 located on the left half clamp 1 and the right half clamp 2 can be mutually buckled on the polished rod when the left half clamp 1 and the right half clamp 2 are closed, and the two grooves 8 are provided with protrusions 6 for pressing on the surface of the polished rod when the grooves 8 are buckled on the polished rod. The grooves 8 can be semicircular arc grooves to form a uniform gap with the outer surface of the polished rod.

[0029] like Figure 1 As shown in FIG. 2( a ) and FIG. 3( b ), the pressing surface of the protrusion 6 pressed against the outer circumference of the polished rod is an arc surface matching the outer circumference of the polished rod.

[0030] The raised pressing surfaces in the grooves 8 of the left half clamp 1 and the right half clamp 2 of this embodiment are semi-cylindrical surfaces that match the side surfaces of the polished rod. Therefore, during construction, the polished rod will be clamped without causing obvious indentations on the surface of the polished rod, and there is no need to frequently use a file to re-polish the polished rod, which reduces the wear of the polished rod and extends the service life of the polished rod.

[0031] Further, as shown in FIG. 2(b) and FIG. 3(a), the protrusions 6 are staggered in the two grooves 8, that is, when the left half clamp 1 and the right half clamp 2 are closed, the protrusion 6 of the left half clamp 1 is opposite to the portion of the protrusion 6 in the groove 8 of the right half clamp 2 (i.e., the groove interval 7), and vice versa; and the dimension of the protrusion 6 in the axial direction of the light rod (i.e., the width of the protrusion 6) is smaller than the dimension of the portion of the protrusion 6 in the opposite groove 8 (the groove interval 7) in the same direction; further, as Figure 6 As shown, the protrusion 6 is also offset from the protrusion in the corresponding groove 8 by a certain distance in the axial direction of the polished rod, that is, the protrusion 6 is opposite to the middle position of the groove interval 7 in the corresponding groove 8, or the groove interval 7 is opposite to the position away from the protrusion 6 in the same groove 8.

[0032] In the present embodiment, in the two opposite grooves 8, the opposite protrusions 6 are completely staggered in the axial direction of the polished rod, and a certain gap is left. The adjacent protrusions pressed on the polished rod are respectively located on the two opposite sides of the polished rod. Due to the existence of the gap between the adjacent protrusions 6 pressed on the polished rod, the polished rod clamped by the polished rod clamp of the present embodiment has a certain micro-deformation in the radial direction, so that the traceless polished rod clamp of the pumping well of the present embodiment can withstand a larger load.

[0033] When buckled, the protrusion 6 is pressed on the outer surface of the polished rod. Although the polished rod is subjected to a large radial pressure at the edge of the pressing surface of the protrusion 6, due to the existence of the gap and the polished rod being made of 55# high-strength steel, experiments have verified that the polished rod clamp of this embodiment will not produce an indentation on it.

[0034] Specifically, the width of the protrusion 6 and the gap between two adjacent protrusions 6 pressing the polished rod are both 9-11 mm.

[0035] The hinge between the left half clamp 1 and the right half clamp 2 is shown in Figures 2(a), 2(b), 3(a) and 3(b), and is achieved through the first hinge hole 9 of the left half clamp at the top of the left half clamp 1 and the hinge hole of the right half clamp at the top of the right half clamp 2 and the pin 3.

[0036] The T-bolt 4 as a fastener is shown in Figures 4(a) and 4(b). It is hinged to the second hinge hole 10 of the left half clamp at the bottom of the left half clamp 1 through the bolt hinge hole 13 and the pin 3 on the T-bolt 4. The T-bolt 4 is rotated so that its screw portion enters the notch 12 at the bottom of the right half clamp 2. The nut 5 threadedly connected on the T-bolt 4 is rotated as shown in Figures 5(a) and 5(b). The nut 5 blocks and presses the edge of the notch 12 at the bottom of the right half clamp 2, thereby clamping the left half clamp 1 and the right half clamp 2 around the hinge.

[0037] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. The seamless polished rod clamp for pumping wells is characterized by: It includes a clamp and a fastener, the clamp is a whole formed by hingedly connecting the top of the left half clamp and the top of the right half clamp, and the left half clamp and the right half clamp are provided with clamping parts for clamping the light rod at positions staggered from the hinge, the clamping parts include grooves respectively formed on the left half clamp and the right half clamp for buckling on the light rod, the grooves are provided with protrusions with pressing surfaces matching the surfaces of the light rod, and the protrusions in the grooves of the left half clamp and the right half clamp are staggered with each other; the fastener is used to fix the left half clamp and the right half clamp at the position where the light rod is clamped by the pressing surfaces of the protrusions.

2. The seamless polished rod clamp for a pumping well according to claim 1, characterized in that: The groove intervals between the protrusions in the left half clamp groove and the protrusions in the right half clamp groove are opposite, and the groove intervals between the protrusions in the right half clamp groove and the protrusions in the left half clamp groove other than the protrusions are opposite.

3. The seamless polished rod clamp for a pumping well according to claim 2, characterized in that: The size of the protrusions in the left half clamp groove along the axial direction of the polished rod is smaller than the spacing between the protrusions in the right half clamp groove, and the size of the protrusions in the right half clamp groove along the axial direction of the polished rod is smaller than the spacing between the protrusions in the left half clamp groove.

4. The seamless polished rod clamp for a pumping well according to claim 3, characterized in that: The two edges of the protrusion in the left half clamp groove on the axial direction of the polished rod and the two edges of the protrusion in the right half clamp groove on the axial direction of the polished rod are staggered with each other.

5. The seamless polished rod clamp for oil pumping wells according to claim 4, characterized in that: There are two protrusions in the left half clamp groove and the right half clamp groove respectively.

6. The seamless polished rod clamp for a pumping well according to claim 5, characterized in that: One end of the left half clamp groove is a protrusion, and the other end is the groove interval; the end of the right half clamp groove that is the same as the protrusion in the left half clamp groove is the groove interval, and the other end is the protrusion.

7. The seamless polished rod clamp for a pumping well according to claim 1, characterized in that: The fastener comprises a bolt with a nut hinged at the bottom of the left half clamp, and a slot opened at the bottom of the right half clamp for accommodating the bolt, and the size of the nut is larger than the size of the slot.

8. The seamless polished rod clamp for a pumping well according to claim 1, characterized in that: The groove is a semicircular arc groove.

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