CN105003211A - Self-propelled drilling pressure applying tool - Google Patents

Abstract

The invention relates to a self-propelled drill pressure applying tool for extended displacement wells and horizontal wells. It solves the problems of difficulty in exerting drilling pressure in the horizontal well section and difficulty in feeding the drill string. The technical solution is: the upper end of the transmission shaft is connected with the output shaft of the screw drilling tool with a threaded thread, and the lower end of the transmission shaft is connected with the drill bit with a threaded thread; In the groove in the middle of the pipe; there is a groove in the inner circle of the half ring, and the two half rings are installed on the three sliders; the lower end of the half ring sleeve is connected with the upper end of the card holder with a thread; the "T" hook of the three tapping blocks They are respectively installed in the three "T" grooves at the bottom of the card holder, and the raised outer edge of the lower part of the tapping block is installed in the grooves on both sides of the slope of the transmission shaft. After the installation is completed, the spiral blades of the three tapping blocks are distributed on the on the same spiral. The invention adopts the hydraulic drive mode, and the operation is simple and reliable; after working, the axial thrust is generated, the drilling pressure is applied to the drill bit, and the upper drill string is dragged.

Description

A self-advancing drilling pressure applying tool

technical field

The invention relates to a self-propelled drill pressure applying tool for extended displacement wells and horizontal wells.

Background technique

In the oil and gas industry, extended-reach wells and horizontal wells are more and more widely used, which greatly saves drilling costs and improves oil and gas recovery. However, the development difficulty of extended-reach wells and horizontal wells is much greater than that of vertical wells, especially in the horizontal section, the frictional resistance between the drill string and the wellbore will cause the drilling pressure to fail to be transmitted to the front end of the drill string and the drill bit, and the drill string may even be damaged. deflection deformation. Therefore, the drilling length of the horizontal section is also greatly limited, which seriously restricts the technical development of extended-reach wells and horizontal wells.

At present, a tool that has been successfully applied in the horizontal section is the "hydraulic oscillator", which uses continuous water hammer to generate axial vibration of the drill string, so that the static friction between the drill string and the wellbore becomes dynamic friction, reducing the The frictional resistance reduces the difficulty of feeding the drill string in the horizontal section. However, the continuous vibration produced by the hydraulic vibrator will damage the drill string and ground equipment to a certain extent, and at the same time, it cannot change the problem of the difficulty in applying the WOB on the drill bit. Based on the above problems, the present invention provides a self-advancing drilling weight applying tool.

Contents of the invention

The object of the present invention is to provide a self-propelled drilling weight application tool in order to drag the drill string in the horizontal section forward and apply the drilling pressure to the drill bit.

In order to achieve the above object, the present invention adopts the following technical solutions: a self-advancing drilling pressure applying tool is composed of a sheath, a half ring, a slide block, a central tube, a clamp, a tapping block and a drive shaft; its structural features Yes: the upper end of the transmission shaft is connected with the output shaft of the screw drilling tool with a screw, and the lower end of the transmission shaft is connected with the drill bit with a screw; the upper part of the transmission shaft is uniformly provided with three through grooves in the circumferential direction to connect the inner and outer spaces of the transmission shaft, and the outer circle of the lower part is provided with a step. Three slopes are evenly arranged in the direction, the slope wedge angle is 10°～15°, grooves are set on both sides of the slope; a circle of grooves is set in the middle of the outer circle of the center tube, the center tube is placed in the inner hole of the transmission shaft, and three sliders The three through grooves passing through the drive shaft are embedded in the groove in the middle of the central tube; the inner circle of the half ring is provided with a groove, the two half rings are installed on three sliders, and the outer circle of the slider is embedded in the groove of the half ring; the sheath Put it into the drive shaft, and connect the lower end of the sheath with the upper end of the card seat with a thread; the inner side of the tapping block is set as a circular arc surface, and the lower part of the inner side is set as an outwardly inclined slope. The wedge angle of the slope is the same as that of the drive shaft. The outer side is set as an arc surface, and a helical blade is set on the outer arc surface. The upper part is set as a "T"-shaped hook; the lower part of the card holder is evenly provided with three "T"-shaped grooves in the circumferential direction, and the "T"-shaped hooks of the three tapping blocks are respectively installed in the three "T"-shaped grooves at the lower part of the card holder Inside, the raised outer edge of the lower part of the tapping block is installed in the grooves on both sides of the slope of the transmission shaft. After the installation is completed, the helical blades of the three tapping blocks are distributed on the same helical line.

The beneficial effects of the present invention are: (1) the present invention adopts the hydraulic drive mode, and the operation is simple and reliable; (2) the present invention generates axial thrust after working, and applies drilling pressure to the drill bit; (3) drags the upper drill string, Help the drill string to advance and extend the length of the horizontal section.

Description of drawings

Fig. 1 is a structural schematic diagram of a self-advancing drilling pressure applying tool tapping block protruding state of the present invention;

Fig. 2 is a structural schematic diagram of a retracted state of a tapping block of a self-advancing drilling pressure applying tool according to the present invention;

Fig. 3 is a schematic diagram of a three-dimensional structure of a self-propelled drilling weight applying tool of the present invention;

Fig. 4 is a schematic diagram of a three-dimensional structure of a transmission shaft;

Fig. 5 is the three-dimensional structure schematic diagram of tapping block;

In the figure: 1. Sheath, 2. Half ring, 3. Slider, 4. Center tube, 5. Holder, 6. Tapping block, 7. Transmission shaft.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, a self-advancing drilling pressure applying tool of the present invention is composed of a sheath 1, a half ring 2, a slider 3, a central tube 4, a clamping seat 5, and a tapping block 6 It is formed with transmission shaft 7; its structural feature is: the upper end of transmission shaft 7 is connected with the threaded screw of the output shaft of the screw drilling tool, and the lower end of transmission shaft 7 is connected with the screw thread of the drill bit; as shown in Figure 4, three A through groove connects the internal and external spaces of the transmission shaft 7, a step is arranged on the outer circle of the lower part, and three slopes are evenly arranged in the circumferential direction of the steps, the wedge angle of the slope is 10°-15°, and grooves are arranged on both sides of the slope; the middle part of the outer circle of the central tube 4 It is set as a circle of grooves, the central tube 4 is placed in the inner hole of the transmission shaft 7, and the three sliders 3 pass through the three through grooves of the transmission shaft 7 and are embedded in the central groove of the central tube 4; the inner circle of the half ring 2 is provided with a groove , the two half-rings 2 are installed on the three sliders 3, the outer circle of the sliders 3 is embedded in the groove of the half-rings 2; the sheath 1 is inserted into the transmission shaft 7, and the lower end of the sheath 1 is connected with the upper end of the card seat 5 with a screw; As shown in Figure 5, the inner side of the tapping block 6 is set as a circular arc surface, and the lower part of the inner side is set as an outwardly inclined slope. The slope wedge angle is the same as that of the transmission shaft 7. The outside of the tapping block 6 is set as an arc surface A helical blade is arranged on the outer arc surface, the helix angle of the helical blade is 2°～9°, and the direction of rotation is right-handed. A raised edge is arranged on the outer side of the lower part of the tapping block 6, and the upper part of the tapping block 6 is set as "T". "-shaped hooks; three "T"-shaped grooves are evenly arranged on the lower part of the deck 5 in the circumferential direction, and the "T"-shaped hooks of the three tapping blocks 6 are respectively installed in the three "T"-shaped grooves at the lower part of the deck 5. The raised outer edge of the tapping block 6 bottom is installed in the grooves on both sides of the slope of the transmission shaft 7. After the installation is completed, the helical blades of the three tapping blocks 6 are distributed on the same helix.

The working principle of a self-propelled drilling pressure application tool of the present invention is: run the present invention to the horizontal well section, the initial position is shown in Figure 2; start the pump to circulate the drilling fluid, and the center pipe 4 is pushed downward by the drilling fluid movement, driving the tapping block 6 to move downward, the tapping block 6 radially expands under the action of the slope of the transmission shaft 7, the helical blade of the tapping block 6 eats into the well wall, and the present invention rotates together with the output shaft of the screw drilling tool , the helical blade of the tapping block 6 advances axially while rotating in the circumferential direction, and drives the present invention to advance axially together, thereby applying the drilling pressure to the drill bit and dragging the upper drill string forward; when the drill string needs to be retracted, stop drilling The fluid circulates, the drill string is rotated in reverse, and the tapping block 6 axially retreats back to the initial position.

Claims (2)

1. A self-propelled drilling pressure applying tool, which is composed of a sheath (1), a half ring (2), a slider (3), a central tube (4), a clamp (5), and a tapping block (6) Composed of transmission shaft (7); characterized in that: the upper end of the transmission shaft (7) is connected with the output shaft of the screw drilling tool with a threaded thread, and the lower end of the transmission shaft (7) is connected with the drill bit with a threaded thread; the upper part of the transmission shaft (7) is uniformly arranged in the circumferential direction Three through grooves connect the internal and external spaces of the transmission shaft (7). A step is arranged on the outer circle of the lower part, and three slopes are evenly arranged in the circumferential direction of the steps. 4) The middle part of the outer circle is set as a circle of grooves, the center tube (4) is inserted into the inner hole of the transmission shaft (7), and the three sliders (3) pass through the three through grooves of the transmission shaft (7) and are embedded in the center tube (4) ) in the middle groove; the inside of the half ring (2) is provided with a groove, the two half rings (2) are installed on the three sliders (3), and the outer circle of the slider (3) is embedded in the groove of the half ring (2) Inside; the sheath (1) is inserted into the transmission shaft (7), and the lower end of the sheath (1) is connected with the upper end of the card seat (5) with a thread; 6) The upper part is set as a "T"-shaped hook; the lower part of the card holder (5) is evenly provided with three "T"-shaped grooves in the circumferential direction, and the "T"-shaped hooks of the three tapping blocks (6) are respectively installed on the card holder ( 5) In the lower three "T" grooves, the lower raised outer edge of the tapping block (6) is installed in the grooves on both sides of the slope of the transmission shaft (7). After the installation is completed, the three tapping blocks (6) ) of the helical blades are distributed on the same helix. 2. The self-advancing drilling pressure applying tool according to claim 1, characterized in that: the inner side of the tapping block (6) is set as a circular arc surface, and the lower part of the inner side is set as an outwardly inclined slope, and the slope wedge angle and The slope wedge angle of the drive shaft (7) is the same, the outer side of the tapping block (6) is set as an arc surface, the outer arc surface is set with a helical blade, the helix angle of the helical blade is 2°-9°, and the direction of rotation is right spin.