CN110359846A - A kind of nearly frameholst hole reaming tool - Google Patents

Abstract

The present invention relates to the nearly frameholst hole reaming tools that the operation of downhole drill reaming hole and borehole wall repair are used in a kind of drilling engineering.It realizes the function of downhole drill reaming hole and borehole wall reparation.Its technical solution is: upper curved cylinder upper end and mud motor output shaft screwed connection, lower shell lower end and drill bit screwed connection；Curved cylinder top inner hole under upper curved cylinder lower part outer circle insertion, under steel ball merging in the radial screw bore of curved cylinder top, steel ball half slides into the sliding slot of curved cylinder lower part outer circle, the other half is mounted on down in the radial screw bore of curved cylinder top steel ball, and nut curved cylinder top radial screw bore under fastens；Water nozzle interference is mounted on down in the stepped hole of curved cylinder lower part inner hole upper end；Six stop pins are mounted on down in the space that six pin grooves and the six pin sliding slots in lower shell inner cavity top are formed in the middle part of curved cylinder outer circle.Drill bit may be implemented around 0~6 ° of well dynamic torque central axis of rotation in the present invention, effectively realizes underground variable diameter reaming hole function.

Description

A near-bit variable diameter reaming tool

technical field

The invention relates to a near-bit variable-diameter reaming tool used for downhole reaming operation while drilling and well wall repairing operation in drilling engineering.

Background technique

In the oil and gas industry, drilling operations have the characteristics of long cycle, high investment, high risk and high technical requirements. With the development of drilling technology, the drilling depth is getting deeper and deeper, and the narrowing of the wellbore causes the tripping operation to encounter obstacles and sticking. In recent years, the application of reaming-while-drilling technology in drilling engineering has greatly reduced drilling costs and improved the quality of oil and gas wells. Reaming-while-drilling technology can effectively deal with problems such as downhole borehole reduction and realize wellbore repair.

At present, the reaming tools used in domestic oil and gas well drilling are mainly divided into arm type reamer and block type reamer. The arm type reamer has low blade strength and is easily damaged; while the block type reamer has a small diameter expansion range. , it is difficult to apply to large reaming section. The above two types of reaming tools have complex structures, many parts, and the reaming size is generally fixed during the working process, so it is difficult to adjust the variable diameter size in real time for different operation blocks.

Based on the above technical background, the present invention provides a near-bit reaming tool with variable diameter, which can realize the function of reducing diameter in multiple size ranges downhole and meet the functional requirements of reaming while drilling technology.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a near-bit variable diameter reaming tool in order to realize the functions of downhole reaming while drilling and wellbore repairing.

In order to achieve the above purpose, the present invention adopts the following technical solutions: a near-bit reducing and reaming tool, which is composed of an upper curved cylinder, a nut, a steel ball, a water nozzle, a lower curved cylinder, an anti-drop cap, a transmission pin, a lower cylinder It is composed of a body and a spring; its structural features are: the upper end of the upper curved barrel is connected with the output shaft of the downhole power drilling tool, and the lower end of the lower barrel is connected with the drill bit thread; A ring of chute is set, the angle between the upper central axis of the upper bending cylinder and the lower central axis of the upper bending cylinder is 3°; the angle between the central axis of the upper inner hole of the lower bending cylinder and the central axis of the inner hole of the lower bending cylinder is 3°, A radial threaded hole is arranged at the upper part of the lower bending cylinder, a stepped hole is arranged at the upper end of the inner hole of the lower bending cylinder, six pin grooves are evenly arranged in the circumferential direction of the middle part of the outer circle of the lower bending cylinder, and the lower part of the outer circle of the lower bending cylinder is set as a stepped shaft; The outer circle of the lower part of the upper bending cylinder is inserted into the inner hole of the upper part of the lower bending cylinder; In the radial threaded hole on the upper part of the bending cylinder, the nut is fastened with the radial threaded hole on the upper part of the lower bending cylinder; the faucet is installed in the stepped hole at the upper end of the lower inner hole of the lower bending cylinder; a ring of stepped surfaces is arranged in the middle of the inner cavity of the lower cylinder The upper part of the inner cavity of the lower cylinder is evenly arranged with six pin chutes in the circumferential direction, and the upper end of the outer circle of the lower cylinder is set as a male thread; the lower part of the lower cylinder is inserted into the upper part of the inner cavity of the lower cylinder, and the spring is installed on the stepped shaft at the lower part of the outer circle of the lower cylinder ; Six anti-rotation pins are installed in the space formed by the six pin grooves in the middle of the outer circle of the lower cylinder and the six pin chutes in the upper part of the lower cylinder inner cavity;

The beneficial effects of the present invention are: (1) the present invention can realize the rotation of the drill bit around the downhole dynamic torque center axis of 0-6°, and effectively realize the downhole variable diameter reaming function; (2) the present invention can perform downhole reaming size (3) The reaming range of the present invention is controlled by the flow rate of drilling fluid, and the operation is simple; (4) The present invention has few parts and simple mechanical structure.

Description of drawings

Fig. 1 is the structural representation of a kind of near-bit variable diameter reaming tool reaming state of the present invention;

Fig. 2 is the structural representation of the non-reaming state of a near-bit variable diameter reaming tool of the present invention;

Figure 3 is a cross-sectional view of Figure 2A-A;

Fig. 4 is the three-dimensional structure schematic diagram of upper bending cylinder;

Fig. 5 is the circular development view of the outer circular chute at the lower part of the upper bending cylinder;

In the picture: 1. Upper curved cylinder, 2. Nut, 3. Steel ball, 4. Water nozzle, 5. Lower curved cylinder, 6. Anti-drop cap, 7. Transmission pin, 8. Lower cylinder, 9. Spring , 101. Chute.

Detailed ways

As shown in Figures 1 and 2, a near-bit reducing and reaming tool is composed of an upper curved cylinder 1, a nut 2, a steel ball 3, a water nozzle 4, a lower curved cylinder 5, an anti-drop cap 6, and a transmission pin. 7. The lower cylinder body 8 and the spring 9 are formed; its structural features are: the upper end of the upper curved cylinder 1 is connected with the output shaft of the downhole power drilling tool, and the lower end of the lower cylinder 8 is connected with the drill bit thread; the upper part of the upper curved cylinder 1 is set as Male thread, a ring of chute 101 is set on the outer circumference of the lower part of the upper bending cylinder 1, the angle between the upper central axis of the upper bending cylinder 1 and the lower central axis of the upper bending cylinder 1 is 3°; The included angle of the central axis of the lower inner hole of the lower bending cylinder 5 is 3°, the upper part of the lower bending cylinder 5 is provided with a radial threaded hole, the upper end of the inner hole of the lower bending cylinder 5 is provided with a stepped hole, and the circumference of the middle part of the outer circle of the lower bending cylinder 5 is uniform. Six pin grooves are set, and the lower part of the outer circle of the lower bending cylinder 5 is set as a stepped shaft; the outer circle of the lower part of the upper bending cylinder 1 is inserted into the inner hole of the upper part of the lower bending cylinder 5, and the steel ball 3 is inserted into the radial threaded hole in the upper part of the lower bending cylinder 5 , half of the steel ball 3 is slid into the chute 101 on the lower outer circle of the upper bending cylinder 1, the other half of the steel ball 3 is installed in the upper radial threaded hole of the lower bending cylinder 5, and the nut 2 and the upper radial threaded hole of the lower bending cylinder 5 Fastening; the faucet 4 is installed in the stepped hole at the upper end of the lower inner hole of the lower curved cylinder 5 with interference; a circle of stepped surfaces is arranged in the middle of the inner cavity of the lower cylinder 8, and six pins are evenly arranged in the circumferential direction of the upper part of the inner cavity of the lower cylinder 8 The chute, the upper end of the outer circle of the lower cylinder 8 is set as a male thread; the lower part of the lower bending cylinder 5 is inserted into the upper part of the inner cavity of the lower cylinder 8, and the spring 9 is installed on the stepped shaft at the lower part of the outer circle of the lower bending cylinder 5; as shown in Figure 3, The six anti-rotation pins 7 are installed in the space formed by the six pin grooves in the middle of the outer circle of the lower curved cylinder 5 and the six pin chutes in the upper part of the inner cavity of the lower cylinder 8; the anti-drop cap 6 and the upper end of the outer circle of the lower cylinder 8 Threaded connection.

As shown in FIGS. 4 and 5 , the structure of the chute 101 ensures that when the steel balls 3 roll axially in the chute 101 , the steel balls 3 rotate in one direction in the circumferential direction in the chute 101 .

The working principle of a near-bit variable diameter reaming tool of the present invention is as follows: run the present invention to the designed well depth position, and the initial state is shown in Figure 2; during reaming operation, lift the drill string for a certain distance, and the lower cylinder body 8 is in The spring 9 slides downward under the elastic force of the spring 9, and the pump is turned on to circulate the drilling fluid. Under the throttling action of the water nozzle 4, the drilling fluid pushes the lower curved cylinder 5 to move down in the axial direction. Rotate at a certain angle; since the angle between the upper central axis of the upper bending tube 1 and the lower central axis of the upper bending tube 1 is 3°, the angle between the central axis of the upper inner hole of the lower bending tube 5 and the central axis of the lower inner hole of the lower bending tube 5 is 3°, after the lower bending cylinder 5 is rotated circumferentially, the angle between the lower part of the lower bending cylinder 5 and the upper central axis of the upper bending cylinder 1 can be adjusted within the range of 0-6°, thereby adjusting the size range of the drill bit reaming.

Claims (1)

1. A near-bit variable diameter reaming tool, which is composed of an upper curved cylinder (1), a nut (2), a steel ball (3), a faucet (4), a lower curved cylinder (5), and an anti-drop cap ( 6), the drive pin (7), the lower cylinder (8) and the spring (9) are formed; it is characterized in that: the upper end of the upper curved cylinder (1) is connected with the output shaft of the downhole power drilling tool by thread, and the lower cylinder (8) The lower end is connected with the drill bit thread; the upper part of the upper bending cylinder (1) is provided with male threads, the outer circumference of the lower part of the upper bending cylinder (1) is provided with a ring of chute (101), and the upper part of the upper bending cylinder (1) is provided with a central axis and the upper bending cylinder. (1) The included angle of the lower central axis is 3°; the included angle between the central axis of the upper inner hole of the lower bending tube (5) and the central axis of the lower inner hole of the lower bending tube (5) is 3°, and the upper part of the lower bending tube (5) A radial threaded hole is provided, a stepped hole is provided at the upper end of the lower inner hole of the lower bending cylinder (5), six pin grooves are evenly arranged in the circumferential direction of the middle part of the outer circle of the lower bending cylinder (5), and the lower part of the outer circle of the lower bending cylinder (5) is provided with six pin grooves. Set as a stepped shaft; the lower outer circle of the upper bending cylinder (1) is inserted into the upper inner hole of the lower bending cylinder (5), the steel ball (3) is inserted into the upper radial threaded hole of the lower bending cylinder (5), and the steel ball (3) One half is slid into the chute (101) on the lower outer circle of the upper curved cylinder (1), the other half of the steel ball (3) is installed in the upper radial threaded hole of the lower curved cylinder (5), the nut (2) and the lower curved cylinder (5) The upper radial threaded hole is fastened; the faucet (4) is installed in the stepped hole at the upper end of the lower inner hole of the lower curved cylinder (5) with interference; The upper part of the inner cavity of the cylinder body (8) is evenly provided with six pin chutes in the circumferential direction, the upper end of the outer circle of the lower cylinder body (8) is set as a male thread; the lower part of the lower curved cylinder (5) is inserted into the upper part of the inner cavity of the lower cylinder body (8) , the spring (9) is installed on the stepped shaft at the lower part of the outer circle of the lower bending cylinder (5); the six anti-rotation pins 7 are installed in the six pin grooves in the middle of the outer circle of the lower bending cylinder (5) and the inner cavity of the lower cylinder (8). In the space formed by the upper six pin chutes; the anti-drop cap (6) is connected with the upper end of the outer circle of the lower cylinder body (8) by a screw thread.