Wellhead centering method for low assembly state of rotary substructure of oil drilling rig

Abstract

The wellhead center control method in the low-position assembly state of the rotary base of the petroleum drilling machine is characterized in that the ear seats on the two side rear bases are drilled in an integral machining mode, the one ends of the two side front columns, the middle column and the rear column are connected with the corresponding ear seat positions of the lower base by using pin shafts, the two side front columns, the middle column and the rear column are laid flat in the same direction, the positions of the two side front columns are fixed, and the center connecting lines of the pin holes at the two ends of the adjacent columns form parallelograms, the other ends of the two side front columns, the middle column and the rear column are connected with the corresponding ear seats of the upper seat by using pin shafts, and the upper and lower wellhead center projections coincide in the vertical state of the columns. The method can guarantee the requirements of the high-position state of the base, reduce the machining difficulty and safety risk, has the characteristics of convenient operation, simple tool, safety and reliability, and can meet the requirements without relying on special equipment.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling equipment manufacturing technology, specifically relating to a wellhead center control method for the low-position assembly state of an oil drilling rig's rotating base. Background Technology

[0002] The swivel-type base is assembled from multiple components, each a large welded structural part. Due to manufacturing tolerances and other factors, after the base is assembled and raised to the working position, the wellhead centers of the upper and lower layers in the front-to-back direction often do not coincide, even when ensuring the verticality of each column. The components in the base are large in size and complex in structure; some components are difficult to machine as a whole. Machining these components as a whole or further improving the precision of machinable parts would significantly increase manufacturing costs and time. If assembly is performed when the base is raised to a high position, the upper layer may be unstable due to the intermediate layer failing to reliably support it. The high manufacturing difficulty, high production cost, and significant safety risks present significant challenges. Summary of the Invention

[0003] The purpose of this invention is to provide a method for controlling the wellhead center in the low-position assembly state of a spiral-lift base for oil drilling rigs, which can simply and efficiently align and overlap the upper and lower wellhead centers of the spiral-lift base after it is raised.

[0004] The technical solution adopted in this invention is a wellhead center control method for the low-position assembly state of a rotary base of an oil drilling rig, specifically including the following steps:

[0005] Step 1: Use an integral machining method to drill holes in the ear seats on both sides of the rear base, and machine pin holes at both ends of the front upright, middle upright, rear upright and diagonal upright on both sides.

[0006] Step 2: Adjust the rear bases on both sides so that the corresponding pin holes are coaxial and at the same height, and the line connecting any two sets of pin holes is parallel. At this time, fix the rear bases as one piece, connect the rear bases on both sides to the corresponding front bases on both sides through pins, and fix the two ends of the connecting frame to the opposite sidewalls of the front bases on both sides.

[0007] Step 3: Connect one end of each front column to the ear seat on the upper surface of the corresponding rear base using a pin. The ear seat should be close to the front base. Connect one end of each middle column to the ear seat on the corresponding rear base using a pin. The ear seat should be located on opposite sides of the rear base. Finally, connect one end of each rear column to the upper surface of the corresponding rear base using a pin. The connection should be located away from the ear seat on the front base.

[0008] Step 4: Connect one end of each of the two inclined columns to the corresponding lugs of the rear base using a pin. The lugs are located on opposite sides of the two rear bases and close to the rear columns. The other end is pinned to the center column.

[0009] Step 5: Remove the two side slanted columns, tilt the front, middle and rear columns on both sides towards the front base, and adjust the positions of the front, middle and rear columns on both sides to form a parallelogram.

[0010] After adjusting the position of the columns in steps 6 and 5, connect the upper base to the other ends of the front columns, middle columns, diagonal columns and rear columns on both sides using pins.

[0011] Step 7: Raise the front, middle, and rear columns and keep them vertical so that the center projections of the upper and lower wellheads coincide.

[0012] The invention is further characterized in that,

[0013] In step 2, the rear base is connected as a whole by aligning the two ends of the connecting beam with the ear holes on the opposite sides of the rear base away from the front base, and then connecting them with pins. One end of the diagonal brace is aligned with the ear plate hole on the side wall of the connecting beam, and the other end is aligned with the ear hole on the opposite side of the rear base. The two ends of the diagonal brace are also connected with pins.

[0014] In step 4, the specific connection method between the two inclined columns and the corresponding middle column is as follows: the two inclined columns are laid down towards the corresponding middle column until one end of the inclined column abuts against the side wall of the middle column. Ear plates are fixed at the abutment position of the inclined column on the side wall of the middle column. The ear plates are used to connect with the inclined columns.

[0015] In step 5, the positions of the front, middle, and rear columns on both sides satisfy the parallelogram principle. Specifically, when the front columns on both sides are placed at their lowest position and the center height of the pin holes at both ends is H, fix the positions of the front columns on both sides. Then adjust the distance between the center of the pin holes at both ends of the middle columns on both sides and the center of the pin holes at both ends of the front columns on both sides. When the lines connecting the center of the pin holes at both ends of the middle columns on both sides and the center of the pin holes at both ends of the corresponding front columns on both sides form a parallelogram, fix the positions of the middle columns on both sides. Then adjust the distance between the center of the pin holes at both ends of the rear columns on both sides and the center of the pin holes at both ends of the middle columns on both sides, so that the lines connecting the center of the pin holes at both ends of the rear columns on both sides and the center of the pin holes at both ends of the corresponding middle columns on both sides form a parallelogram, and fix the positions of the rear columns on both sides.

[0016] Step 6 specifically involves aligning the ear holes at the bottom of the upper left and upper right seats with the pin holes at the ends of the front and rear columns on both sides, and connecting them with pins; aligning the ear holes at the bottom of the support base with the pin holes at the ends of the middle and oblique columns on both sides, ensuring the holes are coaxial, and connecting them with pins; then fixing the upper left and upper right seats to the corresponding pin hole positions on the support base using pins.

[0017] The beneficial effects of this invention are:

[0018] (1) The present invention mainly controls the wellhead center by using specific process measures in the low-position assembly state; according to the product structure characteristics, by performing low-position assembly in the manufacturing process of the spiral base, combined with specific process control measures, the alignment requirements of the upper and lower wellhead centers and the verticality requirements of the front, middle and rear columns are achieved when the spiral base is lifted to the working position.

[0019] (2) This invention can ensure the high position of the base, reduce the processing difficulty and safety risks, and is characterized by convenient operation, simple tools, safety and reliability, and can meet the requirements without relying on special equipment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the high-position assembly state of the lifting base in the control method of the present invention;

[0021] Figure 2 This is a schematic diagram of the vertical assembly state of the inclined column and the central column in the control method of the present invention;

[0022] Figure 3 This is a schematic diagram of the lower assembly state of the spiral base in the control method of the present invention;

[0023] Figure 4 yes Figure 1 Side view;

[0024] Figure 5 This is a schematic diagram of the low-position assembly state of the rotating base in the control method of the present invention.

[0025] In the diagram, 1. Upper right base, 2. Root base, 3. Upper left base, 4. Front right base, 5. Rear right base, 6. Front left base, 7. Rear left base, 8. Connecting frame, 9. Connecting beam, 10. Diagonal brace, 11. Front column, 12. Middle column, 13. Rear column, 14. Diagonal column. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] The structure of the rotary base of an oil drilling rig is as follows: Figure 1 and Figure 2 As shown, it includes a front column 11 and a middle column 12 connecting the upper and lower layers, and a rear column 13. The front column 11 and the middle column 12 have equal lengths. One end of the inclined column 14 is connected to the lower base, and the other end is connected to the middle column 12.

[0028] like Figure 3As shown, the lower base includes a right front base 4 and a right rear base 5, a left front base 6 and a left rear base 7 located on both sides respectively. The right front base 4 and the right rear base 5 are connected by a pin, and the left front base 6 and the left rear base 7 are connected by a pin. A connecting frame 8 is connected between the right front base 4 and the left front base 6. A connecting beam 9 is connected between the right rear base 5 and the left rear base 7 at a position away from the right front base 4 and the left front base 6. Ear plates are fixed to the side wall of the connecting beam 9. One end of the diagonal brace 10 is connected to the ear plate on the side wall of the connecting beam 9 by a pin, and the other end is connected to the ear on the opposite side of the right rear base 5 and the left rear base 7 by a pin.

[0029] like Figure 4 As shown, the front pillars include the left front pillar and the right front pillar, the middle pillars include the left middle pillar and the right middle pillar, the rear pillars include the left rear pillar and the right rear pillar, and the diagonal pillars include the left diagonal pillar and the right diagonal pillar. The two front pillars 11 and the rear pillars 13 are connected to the lugs on the upper surfaces of the right rear base 5 and the left rear base 7 by pins. The two middle pillars 12 and the diagonal pillars 14 are connected to the lugs on the opposite sides of the right rear base 5 and the left rear base 7 by pins.

[0030] The other ends of the right front column and the right rear column are connected to the upper right seat 1 by a pin, and the connection position is located at the bottom of the upper right seat 1. The other ends of the left front column and the left rear column are connected to the upper left seat 3 by a pin, and the connection position is located at the bottom of the upper left seat 3. A support platform 2 is provided between the upper right seat 1 and the upper left seat 3. The support platform 2 is connected to the upper right seat 1 and the upper left seat 3 on the opposite side by a pin. The ear seat at the bottom of the support platform 2 is connected to the right middle column, the left middle column, the right oblique column and the left oblique column by a pin.

[0031] The present invention relates to a method for controlling the wellhead center in the low-position assembly state of a rotary base for oil drilling rigs, comprising the following specific steps:

[0032] Step 1: Make holes in the lugs on the right rear base 5 and the left rear base 7 using the integral machining method, and machine pin holes at both ends of the left front column, right front column, left middle column, right middle column, left rear column, right rear column, left oblique column and right oblique column.

[0033] Step 2: Adjust the right rear base 5 and the left rear base 7 so that the corresponding pin holes are coaxial and at the same height, and the line connecting any two sets of pin holes is parallel. At this time, fix the right rear base 5 and the left rear base 7 into one piece. Align the two ends of the connecting beam (9) with the ear holes on the opposite side of the right rear base 5 and the left rear base 7 away from the front base. Then connect them with pins. Align one end of the diagonal brace (10) with the ear plate hole on the side wall of the connecting beam (9) and the other end with the ear holes on the opposite side of the two rear bases. Connect the two ends of the diagonal brace (10) with pins. Then connect the right rear base 5 and the right front base 4 on both sides with pins. Connect the left rear base 7 and the left front base 6. Fix the two ends of the connecting frame (8) to the opposite side wall of the right front base 4.

[0034] Step 3: Connect one end of the right front pillar and the left front pillar to the lugs on the upper surface of the right rear base 5 and the left rear base 7 using a pin. The connected lugs are close to the front base. Connect one end of the right middle pillar and the left middle pillar to the lugs fixed on the opposite side of the right rear base 5 and the left rear base 7 using a pin. Finally, connect one end of the right rear pillar and the left rear pillar to the lugs on the upper surface of the right rear base 5 and the left rear base 7 away from the front base using a pin.

[0035] Step 4: Connect one end of the right and left inclined columns to the ear seats on the opposite sides of the right rear base 5 and left rear base 7 using pins. The ear seats should be positioned close to the corresponding rear column 13. Then, lay the right and left inclined columns down towards the corresponding right and left center columns until one end of each column abuts against the side wall of the right and left center columns. Fix ear plates to the side walls of the right and left center columns at the abutment positions of the right and left inclined columns. The ear plates are used to connect to the inclined columns 14. Both ends of the right and left inclined columns are connected with pins for easy disassembly. This connection only provides stability when the columns are in a vertical position.

[0036] Step 5, as follows Figure 5 As shown, remove the right and left inclined columns. Place the left front column, right front column, left middle column, right middle column, left rear column, and right rear column along the front base direction to put the device in a low-position assembly state. Adjust the positions of the front columns 11, middle columns 12, and rear columns 13 on both sides. When the left front column and right front column are in their lowest positions and the center height of the pin holes at both ends is H, fix the position of the left front column and right front column. Then adjust the center of the pin holes at both ends of the left middle column and right middle column to align with the pin holes at both ends of the corresponding left front column and right front column. Adjust the center distance between the pin holes at both ends of the left and right center pillars so that the lines connecting the centers of the pin holes at both ends of the corresponding left and right front pillars form a parallelogram. Then fix the positions of the left and right center pillars. Next, adjust the center distance between the pin holes at both ends of the left and right rear pillars so that the lines connecting the centers of the pin holes at both ends of the left and right rear pillars form a parallelogram. Fix the positions of the left and right rear pillars.

[0037] During the manufacturing process of the slewing base, low-level assembly is carried out, combined with specific process control measures, to ensure the alignment of the upper and lower wellhead centers and the verticality of the front, middle, and rear columns on both sides when the slewing base is raised to the working position.

[0038] After adjusting the column positions in steps 6 and 5, align the ear holes at the bottom of the upper right seat 1 and upper left seat 3 with the pin holes at the ends of the left front column, right front column, left rear column, and right rear column on both sides, and connect them with pins; align the ear holes at the bottom of the base 2 with the pin holes at the ends of the left middle column, right middle column, left oblique column, and right oblique column on both sides, and connect them with pins after the holes are coaxial. Then fix the upper right seat 1 and upper left seat 3 with the corresponding pin hole positions of the base 2 using pins.

[0039] At this time, the offset distance between the wellhead center A of the support platform 2 and the lower wellhead center A' is L. When the height H of the center of the pin holes at both ends of the front columns 11 on both sides increases, the offset distance L between the wellhead center A and the lower wellhead center A' decreases accordingly. Conversely, as the offset distance L between the wellhead center A and the lower wellhead center A' increases, the height H of the center of the pin holes at both ends of the left and right front columns on both sides gradually decreases.

[0040] Step 7: Raise the left front column, right front column, left middle column, right middle column, left rear column, and right rear column on both sides and keep them vertical. This will make the center projections of the upper and lower wellheads coincide, reducing processing difficulty and safety risks. The operation is convenient, the tools are simple, and it is safe and reliable. It can meet product quality requirements without relying on special equipment.

[0041] The above assembly method can achieve the alignment requirements of the upper and lower wellhead centers and the verticality requirements of the front, middle and rear columns when the base is raised to the working position.

Claims

1. A method for controlling the wellhead center in the low-position assembly state of a rotary base for oil drilling rigs, characterized in that, Specifically, the following steps are included: Step 1: Make holes in the ear seats on both sides of the rear base by integral machining, and machine the two ends of the front column (11), middle column (12), rear column (13) and diagonal column (14) on both sides into pin holes; Step 2: Adjust the two rear bases to be coaxial and at the same height with the corresponding pin holes, and make the line connecting any two sets of pin holes parallel. At this time, fix the rear bases as one unit, connect the two rear bases to the corresponding front bases with pins, and fix the two ends of the connecting frame (8) to the opposite sidewalls of the two front bases. Step 3: Connect one end of the two front uprights (11) to the ear seat on the upper surface of the corresponding side rear base using a pin. The ear seat is close to the front base. Connect one end of the two middle uprights (12) to the ear seat on the corresponding side rear base using a pin. The ear seat is located on the opposite side of the two rear bases. Finally, connect one end of the two rear uprights (13) to the upper surface of the corresponding side rear base using a pin. The connection position is located away from the ear seat of the front base. Step 4: Connect one end of the two inclined columns (14) to the ear seat of the corresponding rear base through a pin. The connected ear seat is located on the opposite side of the two rear bases and close to the rear column (13). The other end is pinned to the middle column (12). Step 5: Remove the two side slanted columns (14), tilt the two front columns (11), middle columns (12) and rear columns (13) towards the front base, and adjust the positions of the two front columns (11), middle columns (12) and rear columns (13) to form a parallelogram. After completing steps 6 and 5 to adjust the position of the columns, connect the upper base to the other ends of the front columns (11), middle columns (12), diagonal columns (14) and rear columns (13) on both sides using pins. Step 7: Raise the front column (11), middle column (12) and rear column (13) to keep them vertical, so that the center projections of the upper and lower wellheads can coincide. In step 5, the positions of the two front columns (11), the middle column (12), and the rear column (13) satisfy the parallelogram principle. Specifically, when the two front columns (11) are placed at their lowest position and the center height of the pin holes at both ends is H, the positions of the two front columns (11) are fixed. Then, the distance between the center of the pin holes at both ends of the two middle columns (12) and the center of the pin holes at both ends of the two front columns (11) is adjusted. When the line connecting the center of the pin holes at both ends of the two middle columns (12) and the center of the pin holes at both ends of the corresponding front columns (11) forms a parallelogram, the positions of the two middle columns (12) are fixed. Then, the distance between the center of the pin holes at both ends of the two rear columns (13) and the center of the pin holes at both ends of the middle column (12) is adjusted so that the line connecting the center of the pin holes at both ends of the two rear columns (13) and the center of the pin holes at both ends of the corresponding middle columns (12) forms a parallelogram, and the positions of the two rear columns (13) are fixed.

2. The wellhead center control method for the low-position assembly state of the rotary base of the oil drilling rig according to claim 1, characterized in that, In step 2, the rear base is connected as a whole by aligning the two ends of the connecting beam (9) with the ear holes on the opposite sides of the rear base away from the front base, and then connecting them with pins. One end of the diagonal brace (10) is aligned with the ear plate hole on the side wall of the connecting beam (9), and the other end is aligned with the ear holes on the opposite sides of the rear base. The two ends of the diagonal brace (10) are also connected with pins.

3. The wellhead center control method for the low-position assembly state of the rotary base of the oil drilling rig according to claim 1, characterized in that, In step 4, the specific connection method between the two inclined columns (14) and the corresponding middle column (12) is as follows: the two inclined columns (14) are laid down towards the corresponding middle column (12) until one end of the inclined column (14) abuts against the side wall of the middle column (12). Ear plates are fixed at the abutment position of the middle column (12) corresponding to the inclined column (14) on the side wall of the inclined column (14). The ear plates are used to connect with the inclined columns (14).

4. The wellhead center control method for the low-position assembly state of the rotary base of the oil drilling rig according to claim 1, characterized in that, Step 6 specifically involves aligning the ear holes at the bottom of the upper right seat (1) and the upper left seat (3) with the pin holes at the ends of the front column (11) and the rear column (13) on both sides, and connecting them with pins; aligning the ear holes at the bottom of the support platform (2) with the pin holes at the ends of the middle column (12) and the inclined column (14) on both sides, and connecting them with pins after the holes are coaxial; and then fixing the pin hole positions of the upper right seat (1) and the upper left seat (3) with the support platform (2) with pins.

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