Crown block for land drilling machine capable of adjusting borehole center

Abstract

The utility model discloses a crown block for a land drilling machine capable of adjusting the center of a borehole, which comprises guide rails symmetrically arranged on a main beam of a crown block frame, a pulley block is mounted on the crown block frame through an adjusting mechanism, and the adjusting mechanism comprises a longitudinal adjusting plate and a transverse adjusting plate which are respectively driven by a longitudinal adjusting hydraulic cylinder and a transverse adjusting hydraulic cylinder. Longitudinal and transverse movement is achieved along the guide rails. A main shaft of the pulley block is fixed in a round hole of the transverse adjusting plate, and the central position of the pulley block is directly adjusted to accurately align to the center of a borehole by cooperatively controlling the expansion amount of the hydraulic cylinder; the position of the pulley block is directly adjusted through hydraulic drive, a derrick does not need to be disassembled or gaskets do not need to be increased or decreased, operation efficiency is effectively improved, and adjusting precision is high; in the adjusting process, the main structure of the derrick has no length change or deflection, permanent deformation caused by a traditional method is avoided, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of onshore oil and gas drilling and production equipment technology, specifically a crane for an onshore drilling rig with adjustable wellbore center. Background Technology

[0002] Most existing land drilling rigs use fixed pulley systems, requiring adjustments to the wellbore center indirectly by increasing or decreasing the thickness of the gaskets on the derrick connecting flanges. This process is cumbersome and requires hoisting equipment. This method is not only time-consuming and labor-intensive but also prone to causing skew and deformation of the main derrick structure, affecting equipment lifespan and operational safety. Furthermore, traditional adjustment methods cannot respond to wellbore center offsets in real time, making it difficult to meet the demands of high-efficiency drilling. Utility Model Content

[0003] The purpose of this invention is to provide a land drilling rig crane with adjustable wellbore center, which can directly adjust the position of the pulley block through hydraulic drive without changing the derrick structure, thus achieving rapid and precise adjustment of the wellbore center.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a land drilling rig trolley with adjustable wellbore center, comprising a trolley frame, a pulley block, a rope pulley, and an adjustment mechanism. The trolley frame includes a main beam with two guide rails symmetrically arranged on it. The pulley block is mounted on the trolley frame via the adjustment mechanism, which includes a longitudinal adjustment plate and a transverse adjustment plate. The short sides of the longitudinal adjustment plate are embedded in the guide rails of the main beam and connected to a longitudinal adjustment cylinder. One end of the longitudinal adjustment cylinder is fixed to the longitudinal adjustment plate via an ear plate, a pin, and a pin, and the other end is fixed to the trolley frame via an ear plate, a pin, and a pin.

[0005] The lateral adjustment plate is slidably installed in the lateral guide rail provided on the longitudinal adjustment plate and is connected to the lateral adjustment cylinder. One end of the lateral adjustment cylinder is fixed to the longitudinal adjustment plate by a lug, a pin and a pin, and the other end is fixed to the lateral adjustment plate by a lug, a pin and a pin.

[0006] The main shaft of the pulley block is fixed in the round hole of the horizontal adjustment plate, and the rope-reversing pulley is installed on the top of the overhead crane frame.

[0007] Preferably, the adjustment mechanism is symmetrically arranged at both ends of the pulley block.

[0008] Preferably, the longitudinal adjustment cylinder drives the longitudinal adjustment plate to move longitudinally along the guide rail to adjust the longitudinal center position of the pulley block.

[0009] Preferably, the lateral adjustment cylinder drives the lateral adjustment plate to move along the lateral guide rail of the longitudinal adjustment plate to adjust the lateral center position of the pulley block.

[0010] Preferably, the ear plate, pin and pin are connected by a detachable hinge structure.

[0011] Preferably, the total weight of the crane frame, pulley block and adjustment mechanism does not exceed 10% of that of a traditional crane structure.

[0012] The working process of this utility model is as follows:

[0013] Longitudinal adjustment: The longitudinal adjustment cylinder is extended and retracted by the hydraulic system, which drives the longitudinal adjustment plate to move up and down along the guide rail on the main beam of the overhead crane frame, thereby adjusting the longitudinal position of the pulley block.

[0014] Lateral adjustment: Synchronous control of the extension and retraction of the lateral adjustment cylinder drives the lateral adjustment plate to move left and right along the guide rail of the longitudinal adjustment plate, adjusting the lateral position of the pulley block.

[0015] Center calibration: By coordinating the extension and retraction of the longitudinal and transverse hydraulic cylinders, the main shaft center of the pulley block is precisely aligned with the wellbore center, thus completing the wellbore center calibration.

[0016] The beneficial effects of this utility model are as follows:

[0017] (1) This utility model directly adjusts the position of the pulley block by hydraulic drive, without disassembling the derrick or adding or removing shims, which effectively improves the work efficiency and has high adjustment accuracy.

[0018] (2) During the adjustment process, the main structure of the derrick does not change in length or tilt, thus avoiding permanent deformation caused by traditional methods and extending the service life of the equipment.

[0019] (3) The total weight of the adjustment mechanism of this utility model increases by only 8%-10%, without any additional load on the hoisting of the derrick, and the modular design is compatible with various drilling rig models, reducing maintenance costs. Attached Figure Description

[0020] Figure 1 This is the main structural view of this utility model;

[0021] Figure 2 This is a side view of the main structural view of this utility model;

[0022] Figure 3 This is the front view of the structural adjustment mechanism of this utility model;

[0023] Figure 4 This is a side view of the main view of the structural adjustment mechanism of this utility model;

[0024] Figure 5 This is a top view of the main view of the structural adjustment mechanism of this utility model;

[0025] Figure 6 This is a front view of the main beam of the overhead crane frame of this utility model;

[0026] Figure 7 This is a front view of the longitudinal adjustment plate of this utility model.

[0027] In the diagram: 1. Overhead crane frame, 2. Pulley block, 3. Adjustment mechanism, 4. Reverse rope pulley, 11. Main beam, 101. Guide rail, 301. Ear plate, 302. Pin, 303. Pin, 305. Longitudinal adjustment plate, 306. Lateral adjustment plate, 307. Lateral adjustment cylinder, 308. Longitudinal adjustment cylinder. Detailed Implementation

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] like Figure 1-7 The diagram shows an adjustable wellbore centering jack for a land drilling rig, comprising a jack frame 1, a pulley block 2, a rope pulley 4, and an adjustment mechanism 3 symmetrically arranged at both ends of the pulley block 2. The jack frame 1 includes a main beam 11 with two guide rails 101 symmetrically arranged on it. The pulley block 2 is mounted on the jack frame 1 via the adjustment mechanism 3. The adjustment mechanism 3 includes a longitudinal adjustment plate 305 and a transverse adjustment plate 306. The short sides of the longitudinal adjustment plate 305 are embedded in the guide rails 101 of the main beam 11 and connected to a longitudinal adjustment cylinder 308. One end of the longitudinal adjustment cylinder 308 is connected via an ear plate 301, a pin 302, and a safety pin. 303 is fixed to the longitudinal adjusting plate 305, and the other end is fixed to the overhead crane frame 1 through the ear plate 301, pin 302 and pin 303; the transverse adjusting plate 306 is slidably installed in the transverse guide rail provided on the longitudinal adjusting plate 305 and connected to the transverse adjusting cylinder 307. One end of the transverse adjusting cylinder 307 is fixed to the longitudinal adjusting plate 305 through the ear plate 301, pin 302 and pin 303, and the other end is fixed to the transverse adjusting plate 306 through the ear plate 301, pin 302 and pin 303; the main shaft of the pulley block 2 is fixed in the round hole of the transverse adjusting plate 306, and the rope pulley 4 is installed on the top of the overhead crane frame 1.

[0030] The longitudinal adjustment cylinder 308 drives the longitudinal adjustment plate 305 to move longitudinally along the guide rail 101 to adjust the longitudinal center position of the pulley group 2; the lateral adjustment cylinder 307 drives the lateral adjustment plate 306 to move along the lateral guide rail of the longitudinal adjustment plate 305 to adjust the lateral center position of the pulley group 2.

[0031] The ear plate 301, pin 302 and pin 303 are connected by a detachable hinge structure.

[0032] The total weight of the overhead crane frame 1, pulley block 2, and adjustment mechanism 3 shall not exceed 10% of that of a traditional overhead crane structure.

[0033] The working process of this utility model is as follows:

[0034] Longitudinal adjustment: The longitudinal adjustment cylinder 308 is extended and retracted by the hydraulic system, which drives the longitudinal adjustment plate 305 to move up and down along the guide rail 101 on the main beam 11 of the overhead crane frame 1, thereby adjusting the longitudinal position of the pulley block 2.

[0035] Lateral adjustment: Synchronous control of the extension and retraction of the lateral adjustment cylinder 307 drives the lateral adjustment plate 306 to move left and right along the guide rail of the longitudinal adjustment plate 305, thereby adjusting the lateral position of the pulley block 2.

[0036] Center calibration: By coordinating the extension and retraction of the longitudinal and transverse hydraulic cylinders, the center of the main shaft of pulley block 2 is precisely aligned with the center of the wellbore, thus completing the wellbore center calibration.

[0037] This overhead crane achieves dynamic calibration of the wellbore center through a hydraulic linkage adjustment mechanism, breaking through the limitations of traditional indirect adjustment and significantly improving the safety, efficiency, and equipment reliability of drilling operations.

[0038] The above are merely preferred embodiments of this utility model. It should be noted that, for those skilled in the art, based on the technical teachings provided by this utility model and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, and these should also be considered within the scope of protection of this utility model.

Claims

1. A crown block for land drilling rigs with adjustable wellbore center, comprising a crown block frame (1), a sheave block (2), a back rope sheave (4) and an adjustment mechanism (3), characterized in that: The headframe (1) comprises a main beam (11) with two symmetrical guide rails (101) on the main beam (11); The pulley block (2) is installed on the headframe (1) through the adjusting mechanism (3), and the adjusting mechanism (3) comprises a longitudinal adjusting plate (305) and a transverse adjusting plate (306), wherein the two short sides of the longitudinal adjusting plate (305) are embedded in the guide rails (101) of the main beam (11) and are connected with a longitudinal adjusting hydraulic cylinder (308), one end of the longitudinal adjusting hydraulic cylinder (308) is fixed to the longitudinal adjusting plate (305) through an ear plate (301), a pin (302) and a pin (303), and the other end is fixed to the headframe (1) through the ear plate (301), the pin (302) and the pin (303); The transverse adjusting plate (306) is slidingly installed in the transverse guide rail provided on the longitudinal adjusting plate (305) and is connected with a transverse adjusting hydraulic cylinder (307), one end of the transverse adjusting hydraulic cylinder (307) is fixed to the longitudinal adjusting plate (305) through the ear plate (301), the pin (302) and the pin (303), and the other end is fixed to the transverse adjusting plate (306) through the ear plate (301), the pin (302) and the pin (303); The main shaft of the pulley block (2) is fixed in the circular hole of the transverse adjusting plate (306), and the rope reversing pulley (4) is installed on the top of the headframe (1).

2. The crown block of claim 1, wherein: The adjusting mechanism (3) is symmetrically arranged at the two ends of the pulley block (2).

3. The crown block for land drilling rigs with adjustable wellbore center according to claim 1 or 2, characterized in that: The longitudinal adjusting hydraulic cylinder (308) drives the longitudinal adjusting plate (305) to move longitudinally along the guide rail (101) to adjust the longitudinal center position of the pulley block (2).

4. The crown block of claim 3, wherein: The transverse adjusting hydraulic cylinder (307) drives the transverse adjusting plate (306) to move along the transverse guide rail of the longitudinal adjusting plate (305) to adjust the transverse center position of the pulley block (2).

5. A crown block for land drilling rigs with adjustable wellbore center according to claim 4, characterized in that: The ear plate (301), the pin (302) and the pin (303) are connected in a detachable hinged structure.

6. A crown block for land drilling rigs with adjustable wellbore center according to claim 5, characterized in that: The total weight of the headframe (1), the pulley block (2) and the adjusting mechanism (3) is not more than 10% of the weight of the traditional headframe structure.

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