Wellhead centering device and method for pumping unit

Abstract

The invention discloses a pumping unit wellhead centering device which comprises a pumping unit body, a centering measurement module and a wellhead pumping unit polish rod sealer, the pumping unit body, the centering measurement module and the wellhead pumping unit polish rod sealer are vertically arranged, and the wellhead pumping unit polish rod sealer is arranged below a horse head of the pumping unit body. And the centering measurement module is fixedly connected to a gland above the polish rod sealer of the wellhead pumping unit. The invention further discloses a pumping unit wellhead centering method. According to the oil pumping unit wellhead centering device and method, split type design is adopted, the installation process is simplified, the cost expenditure increased due to frequent rod breakage caused by misalignment of oil pumping unit wellhead installation is avoided, the replacement frequency of an oil pumping unit polish rod is reduced, the frequency of the oil pumping unit polish rod in a potential dangerous environment is reduced, and the oil pumping unit wellhead centering device is suitable for popularization and application. And environmental pollution caused by wellhead leakage due to eccentric wear of the polish rod of the pumping unit is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of oil pumping unit equipment, and in particular relates to an oil pumping unit wellhead centering device. The invention also relates to an oil pumping unit wellhead centering method. Background Art

[0002] At present, when installing the alignment between the pumping unit and the wellhead, the traditional method is to use a pull line to measure on the ground. It is also difficult to adjust after the installation is completed. The measurement is only a general and approximate measurement, and the measurement result is inaccurate. The installed pumping unit does not meet the alignment requirements. At present, there is no accurate data to provide substantial guidance and help for the alignment of the pumping unit during the installation process, and the misalignment between the pumping unit and the wellhead will directly lead to frequent breakage of the pumping unit polished rod, increasing cost expenditure. To replace the broken pumping unit polished rod, it is necessary to unload the pumping unit donkey head load before installation, which is time-consuming and laborious. The operation needs to be unloaded and the suspension rope disassembled and installed. Most of them are high-altitude operations. These operations add some high-risk factors and are prone to high-altitude falls and mechanical injuries. The installation quality of the installed pumping unit is not high, and the pumping unit polished rod loaded by the donkey head suspension rope is not highly aligned with the wellhead. Eccentric wear occurs, causing the pumping unit polished rod and the wellhead to eccentrically wear, resulting in problems such as leakage of the wellhead packing. Frequent replacement of the packing increases the cost of maintenance materials and environmental pollution. The misalignment between the pumping unit and the wellhead causes the eccentric wear between the pumping unit rod and the wellhead, which increases the load on the pumping unit suspension point. The increase in friction resistance can cause the donkey head suspension point load to change by about 1 ton, increase power loss, increase power loss by 8% to 15%, increase motor power by 0.5kW to 1kW, and increase energy waste. The procedure for replacing the pumping unit rod is cumbersome and complicated, and construction plans need to be made in advance. Various engineering vehicles are required, such as tank trucks, cranes, aerial vehicles, etc., and approval is required, and the procedures are cumbersome. Frequent maintenance and replacement of pumping unit rods will also cause frequent production stoppages, which will affect the output of oil wells. Summary of the invention

[0003] The purpose of the present invention is to provide a wellhead centering device for an oil pumping unit, which solves the problem of frequent rod breakage and increased cost caused by misalignment of the wellhead when the oil pumping unit is installed.

[0004] Another object of the present invention is to provide a method for centering a wellhead of a pumping unit.

[0005] The technical solution adopted by the present invention is that the wellhead centering device of the oil pumping unit includes an oil pumping unit body, a centering measurement module and a wellhead oil pumping unit polished rod sealer. The oil pumping unit body, the centering measurement module and the wellhead oil pumping unit polished rod sealer are arranged vertically. The wellhead oil pumping unit polished rod sealer and the centering measurement module are both arranged below the donkey head of the oil pumping unit body. The centering measurement module is fixedly connected to the pressure cover above the wellhead oil pumping unit polished rod sealer.

[0006] The present invention is also characterized in that:

[0007] The pumping unit body comprises a pumping unit base, a pumping unit frame is fixedly connected above the pumping unit base, a pumping unit central axis is fixedly connected above the pumping unit frame, and top screws are arranged around the pumping unit central axis;

[0008] The oil pumping unit body also includes an oil pumping unit polished rod, one end of which is connected to the oil pumping unit suspension rope device, and the other end is inserted into the polished rod sealer.

[0009] The centering measurement module includes a measuring disk, a hanging wire bob and a scissors ruler. The measuring disk is fixedly connected above the polished rod sealer of the wellhead pumping unit. The scissors ruler is placed on the surface of the measuring disk. The hanging wire bob is connected to the suspension rope of the pumping unit body through a hanging wire, and the cone tip of the hanging wire bob is in contact with the surface of the measuring disk.

[0010] The measuring disk includes a measuring convex disk and a measuring concave disk. Both the measuring convex disk and the measuring concave disk are semicircular structures. The measuring convex disk and the measuring concave disk are located on the same disk surface. Two dovetail bosses are provided at the diameter of the measuring convex disk. Two dovetail grooves matching the measuring convex disk are provided at the diameter of the measuring concave disk. The measuring convex disk and the measuring concave disk are clamped.

[0011] A semicircular through hole is opened at the center of the measuring convex plate and the measuring concave plate. After the measuring convex plate and the measuring concave plate are clamped together, the through hole matches the polished rod of the oil pump;

[0012] A "T"-shaped slide groove is provided on the circumferential edge of the measuring convex plate and the measuring concave plate, and a fixed lock belt is installed in the slide groove;

[0013] The measuring convex disc and the measuring concave disc are respectively provided with through holes along the radial direction perpendicular to the diameter, and the measuring disc level gauges are respectively provided in the through holes;

[0014] A semicircular fixing sleeve is provided below the measuring convex disc and the measuring concave disc respectively. A through hole matching the oil pumping unit polished rod is opened at the center of the fixing sleeve. The oil pumping unit polished rod is partially inserted into the through hole. A plurality of through holes are opened on the outer wall of the fixing sleeve, and leveling screws are arranged in the through holes.

[0015] The scissors ruler comprises a scissors ruler seat and a scissors ruler handle. An axle seat is arranged in the middle of the side of the scissors ruler seat, and the scissors ruler seat is hinged to the scissors ruler handle through the axle seat.

[0016] A compass is arranged at the center of the scissors ruler seat, and scissors ruler levels are arranged at both ends of the scissors ruler seat, and the center of the compass is located on the center line of the scissors ruler levels.

[0017] The scissors have graduated handles.

[0018] Another technical solution adopted by the present invention is a method for centering a wellhead of an oil pumping unit, which specifically comprises the following steps:

[0019] Step 1. Adjust the compass to the direction from due south to due north, and adjust the scissors ruler level by adjusting the scissors ruler level;

[0020] Step 2: Adjust the measuring plate to a vertical position between the measuring level and the scissor ruler seat, and adjust the measuring plate to a level by adjusting the measuring level;

[0021] Step 3: Adjust the leveling screw on the fixing sleeve to fix the measuring plate;

[0022] Step 4, record the positions A and B where the cone tip of the plumb bob (5) touches the measuring plate;

[0023] Step 5: Record the distance from A to B and the angle between the side of the scissor ruler seat and the scissor ruler handle, and align the wellhead of the pumping unit.

[0024] Another technical solution of the present invention is also characterized in that:

[0025] The specific method of step 4 is: stop the pumping unit at the bottom dead center, and the cone tip of the plumb bob touches the surface of the measuring disk, which is recorded as point A; stop the pumping unit at the top dead center, and the cone tip of the plumb bob touches the surface of the measuring disk, which is recorded as point B.

[0026] The specific process of recording the distance from A to B and the angle between the side of the scissors ruler base and the scissors ruler handle in step 5 is: keep the scissors ruler horizontal and the compass in the direction from due south to due north, move the scissors ruler so that the rotation axis of the scissors ruler base and the scissors ruler handle coincides with A, rotate the scissors ruler handle so that the scissors ruler handle coincides with B, and record the distance from A to B and the angle between the side of the scissors ruler base and the scissors ruler handle.

[0027] The specific process of centering the wellhead of the pumping unit in step 5 is as follows: when the distance between points AB is not greater than 3mm, no adjustment is performed; when the distance between points AB is within the range of 3mm-15mm, the pumping unit walking beam is stopped at a horizontal position, and the top screws around the pumping unit center axis are adjusted to move the pumping unit center axis the distance between AB in the opposite direction along the azimuth measured in step 5; when the distance between points AB is not less than 15mm, the pumping unit walking beam is stopped at a horizontal position, and no less than two corner points of the pumping unit base are selected, and the rotation axis of the scissor ruler seat and the scissor ruler handle coincides with the corner points, so that the pumping unit base moves the distance between AB in the opposite direction along the azimuth measured in step 5.

[0028] The beneficial effects of the present invention are:

[0029] The present invention provides a wellhead centering device for an oil pumping unit, which adopts a split design, simplifies the installation process, avoids the increased cost due to frequent rod breakage caused by misaligned installation of the wellhead of the oil pumping unit, reduces the frequency of replacing the oil pumping unit's bare rod, reduces the frequency of being in a potentially dangerous environment, and avoids environmental pollution caused by wellhead leakage due to eccentric wear of the oil pumping unit's bare rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1It is a schematic diagram of the overall structure of the wellhead centering device of the oil pumping unit of the present invention;

[0031] Figure 2 It is a schematic diagram of adjusting the top screw of the wellhead centering device of the oil pumping unit of the present invention;

[0032] Figure 3 It is a schematic diagram of the connection between the centering measurement module of the wellhead centering device of the oil pumping unit of the present invention and the polished rod sealer of the wellhead oil pumping unit;

[0033] Figure 4 is a top view of the wellhead centering device of the oil pumping unit of the present invention;

[0034] Figure 5 It is a schematic diagram of the base adjustment of the wellhead centering device of the oil pumping unit of the present invention;

[0035] In the figure, 1. pumping unit base, 1-2. pumping unit center shaft, 1-3. top screw, 2. wellhead pumping unit rod sealer, 3. pumping unit rod, 4-1. measuring convex disc, 4-2. measuring concave disc, 4-3. measuring disc level, 4-4. fixing lock belt, 4-5. slide groove, 4-6. fixing sleeve, 4-7. leveling top screw, 5. plumb bob, 6-1. scissors ruler seat, 6-2. scissors ruler handle, 6-3. scissors ruler level, 6-4. compass, 7. pumping unit body, 8. centering measurement module. DETAILED DESCRIPTION

[0036] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] The present invention provides a wellhead centering device for a pumping unit, such as Figure 1 As shown, it includes a pumping unit body 7, a centering measurement module 8 and a wellhead pumping unit rod sealer 2. The pumping unit body 7, the centering measurement module 8 and the wellhead pumping unit rod sealer 2 are arranged vertically. The wellhead pumping unit rod sealer 2 and the centering measurement module 8 are both arranged below the donkey head of the pumping unit body 7. The centering measurement module 8 is fixedly connected to the pressure cover above the wellhead pumping unit rod sealer 2.

[0038] like Figure 2 As shown, the oil pump body 7 includes an oil pump base 1, an oil pump frame is fixedly connected to the top of the oil pump base 1, an oil pump center axis 1-2 is fixedly connected to the top of the oil pump frame, and top screws 1-3 are arranged around the oil pump center axis 1-2. By adjusting the top screws 1-3, the oil pump center axis 1-2 can be fine-tuned.

[0039] like Figure 3 As shown, the pumping unit body 7 also includes a pumping unit polished rod 3, one end of the pumping unit polished rod 3 is connected to the pumping unit hanger, and the other end is inserted into the wellhead pumping unit polished rod sealer 2.

[0040] like Figure 4As shown, the centering measurement module 8 includes a measuring disk 4, a hanging wire bob 5 and a scissors ruler 6. The measuring disk 4 is fixedly connected to the gland above the wellhead pumping unit rod sealer 2. The scissors ruler 6 is placed on the surface of the measuring disk 4. The hanging wire bob 5 is connected to the suspension rope of the pumping unit body 7 through a hanging wire. The cone tip of the hanging wire bob 5 is in contact with the surface of the measuring disk 4. The measuring disk 4 includes a measuring convex disk 4-1 and a measuring concave disk 4-2. Both the measuring convex disk 4-1 and the measuring concave disk 4-2 are semicircular structures. The measuring convex disk 4-1 and the measuring concave disk 4-2 are located on the same disk surface. Two dovetail bosses are provided at the diameter of the measuring convex disk 4-1, and two dovetail grooves matching the measuring convex disk 4-1 are provided at the diameter of the measuring concave disk 4-2. The measuring convex disk 4-1 and the measuring concave disk 4-2 are snap-fitted to form a complete disk, which is easy to disassemble; the measuring convex disk 4-1 and the measuring concave disk 4-2 are both provided with semicircular through holes at the centers of the circles. After the measuring convex disk 4-1 and the measuring concave disk 4-2 are snap-fitted, the through holes match the pumping unit polished rod 3. The pumping unit polished rod 3 is inserted through the through holes and inserted into the wellhead pumping unit polished rod sealer 2; the measuring convex disk 4-1 and the measuring concave disk 4-2 are snap-fitted to form a complete disk, which is easy to disassemble; the measuring convex disk 4-1 and the measuring concave disk 4-2 are both provided with semicircular through holes at the centers of the circles. After the measuring convex disk 4-1 and the measuring concave disk 4-2 are snap-fitted, the through holes match the pumping unit polished rod 3. The pumping unit polished rod 3 is inserted through the through holes and inserted into the wellhead pumping unit polished rod sealer 2; A "T"-shaped slide groove 4-5 is provided on the circumferential edge of the disk 4-1 and the measuring concave disk 4-2, and a fixing lock belt 4-4 is installed in the slide groove 4-5, and the fixing lock belt 4-4 fixes the measuring disk; the measuring convex disk 4-1 and the measuring concave disk 4-2 are respectively provided with through holes in the radial direction perpendicular to the diameter, and a measuring disk level 4-3 is respectively provided in the through holes; a semicircular fixing sleeve 4-6 is respectively provided below the measuring convex disk 4-1 and the measuring concave disk 4-2, and a through hole matching the oil pumping unit rod 3 is provided at the center of the fixing sleeve 4-6, and the oil pumping unit rod 3 is partially inserted into the through hole, and a plurality of through holes are provided on the outer wall of the fixing sleeve 4-6, and a leveling screw 4-7 is provided in the through hole, and the position of the measuring disk is leveled and fixed by adjusting the leveling screw 4-7.

[0041] The scissors ruler 6 includes a scissors ruler seat 6-1 and a scissors ruler handle 6-2. An axle seat is provided in the middle of the side of the scissors ruler seat 6-1. The scissors ruler seat 6-1 is hinged to the scissors ruler handle 6-2 through the axle seat, and the scissors ruler handle 6-2 can rotate along the rotation axis; a compass 6-4 is provided in the center of the scissors ruler seat 6-1, and scissors ruler levels 6-3 are provided at both ends of the scissors ruler seat 6-1. The scissors ruler 6 is adjusted to be level by adjusting the scissors ruler levels 6-3. The center of the compass 6-4 is located on the center line of the scissors ruler levels 6-3. The scissors ruler handle 6-2 has a scale, which can measure the distance between the contact points of the plumb bob 5 on the measuring disk twice.

[0042] Example 1

[0043] like Figure 1As shown, the wellhead centering device of the oil pumping unit proposed in this embodiment includes an oil pumping unit body 7, a centering measurement module 8 and a wellhead oil pumping unit polished rod sealer 2. The oil pumping unit body 7, the centering measurement module 8 and the wellhead oil pumping unit polished rod sealer 2 are arranged vertically. The wellhead oil pumping unit polished rod sealer 2 and the centering measurement module 8 are both arranged below the donkey head of the oil pumping unit body 7. The centering measurement module 8 is fixedly connected to the pressure cover above the wellhead oil pumping unit polished rod sealer 2.

[0044] Example 2

[0045] like Figure 1 As shown, the wellhead centering device of the oil pumping unit proposed in this embodiment includes an oil pumping unit body 7, a centering measurement module 8 and a wellhead oil pumping unit polished rod sealer 2. The oil pumping unit body 7, the centering measurement module 8 and the wellhead oil pumping unit polished rod sealer 2 are arranged vertically. The wellhead oil pumping unit polished rod sealer 2 and the centering measurement module 8 are both arranged below the donkey head of the oil pumping unit body 7. The centering measurement module 8 is fixedly connected to the pressure cover above the wellhead oil pumping unit polished rod sealer 2.

[0046] like Figure 2 As shown, the pumping unit body 7 includes a pumping unit base 1, a pumping unit frame is fixedly connected above the pumping unit base 1, a pumping unit center axis 1-2 is fixedly connected above the pumping unit frame, and top screws 1-3 are arranged around the pumping unit center axis 1-2.

[0047] The pumping unit body 7 further comprises a pumping unit polished rod 3 , one end of which is connected to the pumping unit suspension rope device, and the other end of which is inserted into the polished rod sealer 2 .

[0048] Example 3

[0049] like Figure 1 As shown, the wellhead centering device of the oil pumping unit proposed in this embodiment includes an oil pumping unit body 7, a centering measurement module 8 and a wellhead oil pumping unit polished rod sealer 2. The oil pumping unit body 7, the centering measurement module 8 and the wellhead oil pumping unit polished rod sealer 2 are arranged vertically. The wellhead oil pumping unit polished rod sealer 2 and the centering measurement module 8 are both arranged below the donkey head of the oil pumping unit body 7. The centering measurement module 8 is fixedly connected to the pressure cover above the wellhead oil pumping unit polished rod sealer 2.

[0050] like Figure 2 As shown, the pumping unit body 7 includes a pumping unit base 1, a pumping unit frame is fixedly connected above the pumping unit base 1, a pumping unit center axis 1-2 is fixedly connected above the pumping unit frame, and top screws 1-3 are arranged around the pumping unit center axis 1-2.

[0051] The pumping unit body 7 further comprises a pumping unit polished rod 3 , one end of which is connected to the pumping unit suspension rope device, and the other end of which is inserted into the polished rod sealer 2 .

[0052] The centering measurement module 8 includes a measuring disk 4, a hanging wire bob 5 and a scissors ruler 6. The measuring disk 4 is fixedly connected above the wellhead pumping unit bare rod sealer 2. The scissors ruler 6 is placed on the surface of the measuring disk 4. The hanging wire bob 5 is connected to the suspension rope of the pumping unit body 7 through a hanging wire. The cone tip of the hanging wire bob 5 is in contact with the surface of the measuring disk 4.

[0053] Example 4

[0054] like Figure 1 As shown, the wellhead centering device of the oil pumping unit proposed in this embodiment includes an oil pumping unit body 7, a centering measurement module 8 and a wellhead oil pumping unit polished rod sealer 2. The oil pumping unit body 7, the centering measurement module 8 and the wellhead oil pumping unit polished rod sealer 2 are arranged vertically. The wellhead oil pumping unit polished rod sealer 2 and the centering measurement module 8 are both arranged below the donkey head of the oil pumping unit body 7. The centering measurement module 8 is fixedly connected to the pressure cover above the wellhead oil pumping unit polished rod sealer 2.

[0055] like Figure 2 As shown, the pumping unit body 7 includes a pumping unit base 1, a pumping unit frame is fixedly connected above the pumping unit base 1, a pumping unit center axis 1-2 is fixedly connected above the pumping unit frame, and top screws 1-3 are arranged around the pumping unit center axis 1-2.

[0056] The pumping unit body 7 further comprises a pumping unit polished rod 3 , one end of which is connected to the pumping unit suspension rope device, and the other end of which is inserted into the polished rod sealer 2 .

[0057] The centering measurement module 8 includes a measuring disk 4, a hanging wire bob 5 and a scissors ruler 6. The measuring disk 4 is fixedly connected above the wellhead pumping unit bare rod sealer 2. The scissors ruler 6 is placed on the surface of the measuring disk 4. The hanging wire bob 5 is connected to the suspension rope of the pumping unit body 7 through a hanging wire. The cone tip of the hanging wire bob 5 is in contact with the surface of the measuring disk 4.

[0058] The measuring disk includes a measuring convex disk 4-1 and a measuring concave disk 4-2. Both the measuring convex disk 4-1 and the measuring concave disk 4-2 are semicircular structures. The measuring convex disk 4-1 and the measuring concave disk 4-2 are located on the same disk surface. Two dovetail bosses are provided at the diameter of the measuring convex disk 4-1, and two dovetail grooves matching the measuring convex disk 4-1 are provided at the diameter of the measured concave disk 4-2. The measuring convex disk 4-1 and the measuring concave disk 4-2 are clamped;

[0059] The measuring convex plate 4-1 and the measuring concave plate 4-2 are both provided with semicircular through holes at their centers. After the measuring convex plate 4-1 and the measuring concave plate 4-2 are engaged, the through holes match the polished rod 3 of the oil pumping unit.

[0060] A "T"-shaped slide groove 4-5 is provided on the circumferential edge of the measuring convex disc 4-1 and the measuring concave disc 4-2, and a fixed lock belt 4-4 is installed in the slide groove 4-5;

[0061] The measuring convex disc 4-1 and the measuring concave disc 4-2 are respectively provided with through holes along the radial direction perpendicular to the diameter, and the measuring disc level gauges 4-3 are respectively provided in the through holes;

[0062] A semicircular fixing sleeve 4-6 is provided below the measuring convex disc 4-1 and the measuring concave disc 4-2, respectively. A through hole matching the oil pumping unit polished rod 3 is provided at the center of the fixing sleeve 4-6, and the oil pumping unit polished rod 3 is partially inserted into the through hole. A plurality of through holes are provided on the outer wall of the fixing sleeve 4-6, and a leveling top screw 4-7 is provided in the through hole.

[0063] The present invention provides a method for centering a wellhead of an oil pumping unit, which is specifically implemented according to the following steps:

[0064] Step 1, adjust the compass 6-4 to the direction from due south to due north, and adjust the scissors ruler 6 to the level by adjusting the scissors ruler level 6-3;

[0065] Step 2, adjust the measuring disc 4 to a vertical position between the measuring level 4-3 and the scissor ruler seat 6-1, and adjust the measuring disc 4 to a horizontal position by adjusting the measuring level 4-3;

[0066] Step 3, adjust the leveling screw 4-7 on the fixing sleeve 4-6 to fix the measuring plate 4;

[0067] Step 4, record the positions A and B where the cone tip of the plumb bob 5 contacts the measuring plate 4;

[0068] When the pumping unit is stopped at the bottom dead center, the hammer cone tip of the plumb bob (5) contacts the surface of the measuring disk 4, which is recorded as point A; when the pumping unit is stopped at the top dead center, the hammer cone tip of the plumb bob 5 contacts the surface of the measuring disk 4, which is recorded as point B.

[0069] Step 5, record the distance from A to B and the angle between the side of the scissor ruler seat 6-1 and the scissor ruler handle 6-2, and align the wellhead of the pumping unit;

[0070] Keep the scissors ruler 6 horizontal and the compass 6-4 in the south-to-north direction, move the scissors ruler 6 so that the rotation axis of the scissors ruler base 6-1 and the scissors ruler handle 6-2 coincides with A, rotate the scissors ruler handle 6-2 so that the scissors ruler handle 6-2 coincides with B, and record the distance from A to B and the angle between the side of the scissors ruler base 6-1 and the scissors ruler handle 6-2;

[0071] When the distance between points AB is not greater than 3mm, no adjustment is performed; when the distance between points AB is within the range of 3mm-15mm, the pumping unit walking beam is stopped at a horizontal position, and the top screws 1-3 around the pumping unit center axis 1-2 are adjusted to move the pumping unit center axis 1-2 in the opposite direction of the azimuth measured in step 5 by the distance between AB; when the distance between points AB is not less than 15mm, the pumping unit walking beam is stopped at a horizontal position, and no less than two corner points of the pumping unit base 1 are selected, and the rotation axes of the scissor ruler seat 6-1 and the scissor ruler handle 6-2 coincide with the corner points, so that the pumping unit base 1 moves in the opposite direction of the azimuth measured in step 5 by the distance between AB.

[0072] Example 5

[0073] Step 1, adjust the compass 6-4 to the direction from due south to due north, and adjust the scissors ruler 6 to the level by adjusting the scissors ruler level 6-3;

[0074] Step 2, adjust the measuring disc 4 to a vertical position between the measuring level 4-3 and the scissor ruler seat 6-1, and adjust the measuring disc 4 to a horizontal position by adjusting the measuring level 4-3;

[0075] Step 3, adjust the leveling screw 4-7 on the fixing sleeve 4-6 to fix the measuring plate 4;

[0076] Step 4, stop the pumping unit at the bottom dead center position, the hammer cone tip of the plumb bob 5 contacts the surface of the measuring disk 4, which is recorded as point A; stop the pumping unit at the top dead center position, the hammer cone tip of the plumb bob 5 contacts the surface of the measuring disk 4, which is recorded as point B;

[0077] Step 5, keep the scissors ruler 6 horizontal and the compass 6-4 in the direction from due south to due north, move the scissors ruler 6, make the rotation axis of the scissors ruler base 6-1 and the scissors ruler handle 6-2 coincide with A, rotate the scissors ruler handle 6-2, make the scissors ruler handle 6-2 coincide with B, record the distance from A to B as 3mm and the angle between the side of the scissors ruler base 6-1 and the scissors ruler handle 6-2 as 30° south by west, and do not adjust.

[0078] Example 6

[0079] Step 1, adjust the compass 6-4 to the direction from due south to due north, and adjust the scissors ruler 6 to the level by adjusting the scissors ruler level 6-3;

[0080] Step 2, adjust the measuring disc 4 to a vertical position between the measuring level 4-3 and the scissor ruler seat 6-1, and adjust the measuring disc 4 to a horizontal position by adjusting the measuring level 4-3;

[0081] Step 3, adjust the leveling screw 4-7 on the fixing sleeve 4-6 to fix the measuring plate 4;

[0082] Step 4, stop the pumping unit at the bottom dead center position, the hammer cone tip of the plumb bob 5 contacts the surface of the measuring disk 4, which is recorded as point A; stop the pumping unit at the top dead center position, the hammer cone tip of the plumb bob 5 contacts the surface of the measuring disk 4, which is recorded as point B;

[0083] Step 5, keep the scissors ruler 6 horizontal and the compass 6-4 in the south to north direction, move the scissors ruler 6, make the rotation axis of the scissors ruler base 6-1 and the scissors ruler handle 6-2 coincide with A, rotate the scissors ruler handle 6-2, make the scissors ruler handle 6-2 coincide with B, record the distance from A to B as 10mm and the angle between the side of the scissors ruler base 6-1 and the scissors ruler handle 6-2 as 45° south by west, such as Figure 5 As shown, stop the pumping unit walking beam to a horizontal position, adjust the top screws 1-3 around the pumping unit center axis 1-2, and move the pumping unit center axis 1-2 10 mm in the reverse direction along 45° north-east.

[0084] Example 7

[0085] Step 1, adjust the compass 6-4 to the direction from due south to due north, and adjust the scissors ruler 6 to the level by adjusting the scissors ruler level 6-3;

[0086] Step 2, adjust the measuring disc 4 to a vertical position between the measuring level 4-3 and the scissor ruler seat 6-1, and adjust the measuring disc 4 to a horizontal position by adjusting the measuring level 4-3;

[0087] Step 3, adjust the leveling screw 4-7 on the fixing sleeve 4-6 to fix the measuring plate 4;

[0088] Step 4, stop the pumping unit at the bottom dead center position, the hammer cone tip of the plumb bob 5 contacts the surface of the measuring disk 4, which is recorded as point A; stop the pumping unit at the top dead center position, the hammer cone tip of the plumb bob 5 contacts the surface of the measuring disk 4, which is recorded as point B;

[0089] Step 5: Keep the scissors ruler 6 horizontal and the compass 6-4 in the south-to-north direction, move the scissors ruler 6 so that the rotation axis of the scissors ruler base 6-1 and the scissors ruler handle 6-2 coincides with A, rotate the scissors ruler handle 6-2 so that the scissors ruler handle 6-2 coincides with B, and record the distance from A to B as 200 mm and the angle between the side of the scissors ruler base 6-1 and the scissors ruler handle 6-2 as 30° south by west. Figure 5 As shown, the pumping unit walking beam is stopped at a horizontal position, and at least two corner points of the pumping unit base 1 are selected, and the rotation axes of the scissor ruler seat 6-1 and the scissor ruler handle 6-2 coincide with the corner points, so that the pumping unit base 1 moves 200 mm in the reverse direction along the north-east direction at 30°.

Claims

1. A wellhead centering device for a pumping unit, characterized in that: The invention comprises a pumping unit body (7), a centering measurement module (8) and a wellhead pumping unit rod sealer (2); the pumping unit body (7), the centering measurement module (8) and the wellhead pumping unit rod sealer (2) are arranged vertically; the wellhead pumping unit rod sealer (2) and the centering measurement module (8) are both arranged below the donkey head of the pumping unit body (7); and the centering measurement module (8) is fixedly connected to the gland above the wellhead pumping unit rod sealer (2).

2. The wellhead centering device for a pumping unit according to claim 1, characterized in that: The pumping unit body (7) comprises a pumping unit base (1), a pumping unit frame is fixedly connected above the pumping unit base (1), a pumping unit center shaft (1-2) is fixedly connected above the pumping unit frame, and top screws (1-3) are arranged around the pumping unit center shaft (1-2); The pumping unit body (7) also includes a pumping unit polished rod (3), one end of which is connected to the suspension rope of the pumping unit body (7) and the other end of which is inserted into the polished rod sealer (2).

3. The wellhead centering device for a pumping unit according to claim 2, characterized in that: The centering measurement module (8) comprises a measuring disk (4), a plumb bob (5) and a scissors ruler (6); the measuring disk (4) is fixedly connected above the wellhead pumping unit bare rod sealer (2); the scissors ruler (6) is placed on the surface of the measuring disk (4); the plumb bob (5) is connected to the suspension rope of the pumping unit body (7) through a suspension line; the cone tip of the plumb bob (5) contacts the surface of the measuring disk (4).

4. The wellhead centering device for a pumping unit according to claim 3, characterized in that: The measuring disk (4) comprises a measuring convex disk (4-1) and a measuring concave disk (4-2); the measuring convex disk (4-1) and the measuring concave disk (4-2) are both semicircular structures; the measuring convex disk (4-1) and the measuring concave disk (4-2) are located on the same disk surface; two dovetail bosses are provided at the diameter of the measuring convex disk (4-1); two dovetail grooves matching the measuring convex disk (4-1) are provided at the diameter of the measuring concave disk (4-2); the measuring convex disk (4-1) and the measuring concave disk (4-2) are clamped; The measuring convex plate (4-1) and the measuring concave plate (4-2) are both provided with a semicircular through hole at the center thereof, and after the measuring convex plate (4-1) and the measuring concave plate (4-2) are snap-fitted, the through hole matches the oil pumping unit polished rod (3); A "T"-shaped sliding groove (4-5) is provided on the circumferential edges of the measuring convex disc (4-1) and the measuring concave disc (4-2), and a fixing lock belt (4-4) is installed in the sliding groove (4-5); The measuring convex disc (4-1) and the measuring concave disc (4-2) are respectively provided with through holes along a radial direction perpendicular to the diameter, and measuring disc level gauges (4-3) are respectively provided in the through holes; A semicircular fixing sleeve (4-6) is respectively provided below the measuring convex disc (4-1) and the measuring concave disc (4-2); a through hole matching the oil pumping unit's polished rod (3) is provided at the center of the fixing sleeve (4-6); the oil pumping unit's polished rod (3) is partially inserted into the through hole; a plurality of through holes are provided on the outer wall of the fixing sleeve (4-6); and leveling screws (4-7) are provided in the through holes.

5. The wellhead centering device for a pumping unit according to claim 3, characterized in that: The scissors ruler (6) comprises a scissors ruler seat (6-1) and a scissors ruler handle (6-2); an axle seat is provided in the middle of the side of the scissors ruler seat (6-1); the scissors ruler seat (6-1) is hinged to the scissors ruler handle (6-2) via the axle seat; A compass (6-4) is provided at the center of the scissors ruler seat (6-1), and scissors ruler levels (6-3) are provided at both ends of the scissors ruler seat (6-1), and the center of the compass (6-4) is located on the center line of the scissors ruler levels (6-3).

6. The wellhead centering device for a pumping unit according to claim 5, characterized in that: The scissors handle (6-2) is provided with scales.

7. A method for centering a wellhead of a pumping unit according to any one of claims 1 to 6, characterized in that: Follow the steps below to implement it: Step 1: Adjust the compass (6-4) to the direction from due south to due north, and adjust the scissors ruler (6) to the level by adjusting the scissors ruler level (6-3). Step 2, adjust the measuring disc (4) to a vertical position between the measuring level (4-3) and the scissor ruler seat (6-1), and adjust the measuring disc (4) to a horizontal position by adjusting the measuring level (4-3); Step 3, adjust the leveling screw (4-7) on the fixing sleeve (4-6) to fix the measuring plate (4); Step 4, recording the positions A and B where the cone tip of the plumb bob (5) contacts the measuring plate (4); Step 5, record the distance from A to B and the angle between the side of the scissor ruler seat (6-1) and the scissor ruler handle (6-2), and align the wellhead of the pumping unit.

8. The method for centering a wellhead of a pumping unit according to claim 7, characterized in that: The specific method of step 4 is: stop the oil pump at the bottom dead center position, the hammer cone tip of the plumb bob (5) contacts the surface of the measuring disk (4), which is recorded as point A; stop the oil pump at the top dead center position, the hammer cone tip of the plumb bob (5) contacts the surface of the measuring disk (4), which is recorded as point B.

9. The method for centering a wellhead of a pumping unit according to claim 7, characterized in that: The specific process of recording the distance from A to B and the angle between the side of the scissors ruler base (6-1) and the scissors ruler handle (6-2) in step 5 is as follows: keep the scissors ruler (6) horizontal and the compass (6-4) in the direction from due south to due north, move the scissors ruler (6) so that the rotation axis of the scissors ruler base (6-1) and the scissors ruler handle (6-2) coincides with A, rotate the scissors ruler handle (6-2) so that the scissors ruler handle (6-2) coincides with B, and record the distance from A to B and the angle between the side of the scissors ruler base (6-1) and the scissors ruler handle (6-2).

10. The method for centering a wellhead of an oil pumping unit according to claim 7, characterized in that: The specific process of centering the wellhead of the pumping unit in step 5 is as follows: when the distance between the two points AB is not greater than 3 mm, no adjustment is performed; when the distance between the two points AB is within the range of 3 mm-15 mm, the pumping unit walking beam is stopped at a horizontal position, and the top screws (1-3) around the central axis (1-2) of the pumping unit are adjusted to make the central axis (1-2) of the pumping unit move in the opposite direction along the azimuth measured in step 5 by the distance between AB; when the distance between the two points AB is not less than 15 mm, the pumping unit walking beam is stopped at a horizontal position, and no less than two corner points of the pumping unit base (1) are selected, and the rotation axis of the scissor ruler seat (6-1) and the scissor ruler handle (6-2) coincides with the corner points, so that the pumping unit base (1) moves in the opposite direction along the azimuth measured in step 5 by the distance between AB.

Images