CN118223800B - Bionic flexible drill rod with ultra-short radius - Google Patents

Abstract

The invention discloses an ultra-short radius bionic flexible drill rod, belonging to the technical field of oil drilling, comprising a high-pressure hose, a plurality of sealing sleeves are sleeved on the outer surface of the high-pressure hose, and a connecting shaft is connected to the outer side of the sealing sleeve; wherein the connecting shaft comprises a first sleeve, a second sleeve and a third sleeve, transmission pins are fixed on both sides of the sealing sleeve, and the sealing sleeve is fixedly connected to the second sleeve through the transmission pin; a movable shaft is rotatably sleeved on the transmission pin, a fixed plate is fixedly installed on one side of the movable shaft, and the outer surface of the fixed plate is fixedly connected to the first sleeve; a connecting plate is provided at one end where the second sleeve is connected to the third sleeve, and is movably connected through a rotating shaft; the phase angles of the connecting plate and the transmission pin on the circumference of the second sleeve differ by 90 degrees; the present invention improves the problem that the prior art cannot meet the needs of wellbores with larger curvatures and has poor flexibility.

Description

A bionic flexible drill rod with ultra-short radius

Technical Field

The invention belongs to the technical field of oil drilling, and in particular relates to an ultra-short radius bionic flexible drill rod.

Background technique

With the gradual deepening of oil exploration and development in my country, after years of water injection development, the fractured water area of oil wells has gradually increased, and a large amount of residual oil has accumulated on both sides of the fractures. With the proportion of recoverable reserves in the newly discovered reserves of oil and gas reservoirs decreasing year by year, the reserves of heavy oil, complex small fault blocks, low permeability reservoirs and ultra-low permeability reservoirs have increased year by year. Ultra-short radius side drilling horizontal well technology is a new technology for developing and tapping the potential of residual oil. This technology mainly involves direct window side drilling in the original well casing. The obvious difference between it and conventional horizontal wells is that the radius of curvature is particularly small, generally not more than 4m. Conventional drilling tools cannot meet this requirement. Special flexible drilling tools are required for drilling. Flexible drilling tools not only have the function of transmitting loads such as axial force and torque, but also have the ability to bend easily and control the wellbore trajectory. The patent with application number CN202310549124.4 discloses a flexible drill pipe and a ball cage type flexible short section used therein. The ball cage type flexible short section includes a ball seat, a ball cage, six ball keys and a ball head. Since the ball key is embedded in the square hole of the ball cage, a large friction force will be generated during the movement, resulting in wear between the ball key and the ball cage, reducing the life and stability of the hinged parts. The patent with application number CN202310967928.6 discloses an ultra-short radius horizontal well deflection drilling tool. The two ends of the drill pipe are connected to external splines respectively, and the upper external spline and the lower external spline are meshed for transmission. This effectively solves the current unstable torque transmission of universal joint flexible drilling tools. Since the external spline is a hemispherical structure as a whole, it is easy to deform or break under high load, resulting in the strength and stability of the drilling tool being affected.

At present, the flexible drilling tools in the prior art usually do not have high flexibility in bending during drilling work, and thus cannot meet the torque, drilling pressure and curvature radius requirements of the drill pipe, resulting in inconvenience when targeting wellbores with large curvature. To address the above problems, an ultra-short radius bionic drill pipe is provided herein.

Summary of the invention

The purpose of the present invention is to provide an ultra-short radius bionic flexible drill rod, aiming to improve the problems in the prior art that the drill rod cannot meet the requirements of wellbores with larger curvatures and has poor flexibility.

The present invention adopts the following technical solutions:

An ultra-short radius bionic flexible drill rod comprises a high-pressure hose, a plurality of sealing sleeves are sleeved on the outer surface of the high-pressure hose, and a connecting shaft is connected to the outer side of the sealing sleeve;

Wherein, the connecting shaft includes a first sleeve, a second sleeve and a third sleeve, and transmission pins are fixed on both sides of the sealing sleeve, and the sealing sleeve is fixedly connected to the second sleeve through the transmission pins; a movable shaft is rotatably sleeved on the transmission pin, and a fixed plate is fixedly installed on one side of the movable shaft, and the outer surface of the fixed plate is fixedly connected to the first sleeve; a connecting plate is provided at one end where the second sleeve and the third sleeve are connected, and are movably connected through a rotating shaft; the phase angle between the connecting plate and the transmission pin on the circumference of the second sleeve differs by 90 degrees.

Furthermore, rubber pads are arranged on both sides of the interior of the sealing sleeve, one end of the rubber pad is fixedly connected to a buffer spring, one end of the buffer spring is fixedly connected to a semi-arc plate, and the semi-arc plate abuts against the high-pressure hose;

The buffer spring is in a compressed state during installation.

Furthermore, one end of the high-pressure hose is connected to a plug tube, and the other end is connected to a drill bit.

Furthermore, the high-pressure hose is made of fiber-reinforced polyurethane hose material.

Furthermore, the elastic modulus of the high-pressure hose material ranges from 2000 MPa to 5000 MPa.

The elastic modulus range of the above materials can ensure that the hose can provide the required support and cushioning effect under different working conditions.

The present invention has the following beneficial effects:

The present invention arranges a connecting shaft to wrap the high-pressure hose through a segmented structure. At the same time, the arrangement of the transmission pin, the movable shaft, and the rotating shaft can greatly improve the flexibility and bending degree of the high-pressure hose. During the drilling process, it can not only transmit torque and drilling pressure, but also meet the requirements of the curvature radius of the flexible drill pipe, so that the high-pressure hose can more easily adapt to the curvature of the wellbore. Therefore, it can be used to drill more complex and more curved wellbores, including ultra-short radius horizontal wells. Secondly, the ultra-short radius can increase the flexibility and adaptability of drilling, so that the drilling operation can better meet the geological conditions and engineering requirements.

The present invention uses a compression spring to drive the semi-arc plate to provide a stable support function for the connection between the high-pressure hose and the sealing sleeve, thereby preventing the problem of sealing failure during the drilling process. The rubber pad can further play a buffering role to ensure the drilling stability of the structure.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a partial structural front view of the present invention.

FIG. 2 is a cross-sectional view of the present invention.

FIG. 3 is a three-dimensional schematic diagram of a partial structure of the present invention.

FIG. 4 is a three-dimensional schematic diagram of a transmission pin.

FIG. 5 is a three-dimensional schematic diagram of the movable axis.

FIG. 6 is a three-dimensional schematic diagram of the first sleeve.

FIG. 7 is a three-dimensional schematic diagram of the second sleeve.

FIG8 is a three-dimensional schematic diagram of the third sleeve.

FIG. 9 is a three-dimensional schematic diagram of the entire exterior of the sealing sleeve.

FIG. 10 is a schematic diagram of the internal structure of the sealing sleeve.

Legend: 1. High-pressure hose; 2. Sealing sleeve; 3. Connecting shaft; 301. First sleeve; 302. Second sleeve; 303. Third sleeve; 4. Transmission pin; 5. Movable shaft; 6. Fixed plate; 7. Connecting plate; 8. Rotating shaft; 9. Rubber pad; 10. Buffer spring; 11. Semi-arc plate; 12. Plug tube; 13. Drill bit.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

Referring to Figures 1 to 10, an ultra-short radius bionic flexible drill rod includes a high-pressure hose 1, on the outer surface of which a multi-section sealing sleeve 2 is sleeved, and a connecting shaft 3 is connected to the outside of the sealing sleeve 2; wherein the connecting shaft 3 includes a first sleeve 301, a second sleeve 302 and a third sleeve 303, and transmission pins 4 are fixed on both sides of the sealing sleeve 2, and the sealing sleeve 2 is fixedly connected to the second sleeve 302 through the transmission pin 4; a movable shaft 5 is rotatably sleeved on the transmission pin 4, and a fixing plate 6 is fixedly installed on one side of the movable shaft 5, and the outer surface of the fixing plate 6 is fixedly connected to the first sleeve 301; a connecting plate 7 is provided at one end where the second sleeve 302 and the third sleeve 303 are connected, and are movably connected through a rotating shaft 8; the phase angle of the connecting plate 7 and the transmission pin 4 on the circumference of the second sleeve 302 differs by 90 degrees. The first sleeve 301 and the second sleeve 302 can be swung in lateral azimuth angle by the transmission pin 4 and the movable shaft 5; the second sleeve 302 and the third sleeve 303 can be swung in vertical azimuth angle by the connecting plate 7 and the rotating shaft 8, so that the high-pressure hose 1 can adapt to more curved drilling as shown in Figure 3.

Rubber pads 9 are provided on both sides of the sealing sleeve 2. A buffer spring 10 is fixedly connected to one end of the rubber pad 9. A semi-arc plate 11 is fixedly connected to one end of the buffer spring 10. The semi-arc plate 11 abuts against the high-pressure hose 1. The buffer spring 10 is in a compressed state during installation. The semi-arc plate 11 is driven by the buffer spring 10 to press the sealing sleeve 2, thereby improving the sealing effect of the sealing sleeve 2. At the same time, the rubber pad 9 improves the stability of the equipment. The buffer spring 10 is in a compressed state during installation. The compressed state of the buffer spring 10 can continuously provide elastic force to the semi-arc plate 11, so that it abuts firmly against both sides of the sealing sleeve 2, playing a role of stable support.

One end of the high-pressure hose 1 is connected to a plug tube 12, and the other end is connected to a drill bit 13. The high-pressure hose 1 is made of fiber-reinforced polyurethane hose material, which has the advantages of wear resistance, corrosion resistance, elasticity and flexibility, etc., to prevent the hose from deforming under high pressure, and at the same time help to reduce the damage to the hose when it is subjected to external impact or friction, and maintain the flexibility of the hose. The elastic modulus of the material ranges from 2000 MPa to 5000 MPa. The elastic modulus range of the above material can ensure that the hose can provide the required support and buffering effect under different working conditions.

Working principle of the present invention:

When in use, three connecting shafts 3 are set to combine the spine structure of a bionic crocodile with a flexible drill pipe, and the contraction and extension of the crocodile spine are applied to the ultra-short radius drill pipe, so that the high-pressure hose 1 is sleeved on the inside of the sealing sleeve 2, and the vertical azimuth angle change is achieved through the transmission pin 4, the movable shaft 5 and the fixed plate 6 between the first sleeve 301 and the second sleeve 302, and the lateral azimuth angle change is achieved through the movable connection between the connecting plate 7 and the rotating shaft 8 between the second sleeve 302 and the third sleeve 303, so as to meet the curvature radius requirement of the high-pressure hose 1, and the semi-arc plate 11 is driven by the buffer spring 10 to provide an extrusion effect to the sealing sleeve 2. The buffer spring 10 is set to a compressed state design, so as to improve the sealing effect of the sealing sleeve 2 on the high-pressure hose 1, and at the same time, the rubber pad 9 is used to ensure that the drilling stability of the device is improved during the drilling process through the drill bit 13, and the plug pipe 12 has a cementing effect, which is used to isolate cement slurry and displacement fluid.

Claims (4)

1. An ultra-short radius bionic flexible drill rod, characterized in that it comprises a high-pressure hose (1), a plurality of sealing sleeves (2) are sleeved on the outer surface of the high-pressure hose (1), and a connecting shaft (3) is connected to the outer side of the sealing sleeve (2); The connecting shaft (3) comprises a first shaft sleeve (301), a second shaft sleeve (302) and a third shaft sleeve (303); transmission pins (4) are fixed on both sides of the sealing sleeve (2); the sealing sleeve (2) is fixedly connected to the second shaft sleeve (302) via the transmission pins (4); a movable shaft (5) is rotatably sleeved on the transmission pin (4); a fixing plate (6) is fixedly mounted on one side of the movable shaft (5); an outer surface of the fixing plate (6) is fixedly connected to the first shaft sleeve (301); a connecting plate (7) is provided at one end of the second shaft sleeve (302) and the third shaft sleeve (303), and the two ends are movably connected via a rotating shaft (8); the phase angles of the connecting plate (7) and the transmission pin (4) on the circumference of the second shaft sleeve (302) differ by 90 degrees; Rubber pads (9) are provided on both sides of the interior of the sealing sleeve (2); one end of the rubber pad (9) is fixedly connected to a buffer spring (10); one end of the buffer spring (10) is fixedly connected to a semi-arc plate (11); the semi-arc plate (11) is in contact with the high-pressure hose (1); The buffer spring (10) is in a compressed state during installation. 2. The ultra-short radius bionic flexible drill rod according to claim 1, characterized in that one end of the high-pressure hose (1) is connected to a plug tube (12), and the other end is connected to a drill bit (13). 3. The ultra-short radius bionic flexible drill rod according to claim 1, characterized in that: the high-pressure hose (1) is made of fiber-reinforced polyurethane hose material. 4. The ultra-short radius bionic flexible drill rod according to claim 1, characterized in that the elastic modulus of the material of the high-pressure hose (1) ranges from 2000 MPa to 5000 MPa.