A multifunctional, dual-acting hydraulic tool for continuous plugging and drilling and a method for using it

Claims

1. A multifunctional, dual-action hydraulic tool for continuous plugging and drilling, comprising: a vertically positioned outer pipe with cutting blocks configured to open outward and located at intervals around the circumference on the lower side wall of the outer pipe, a throttle sleeve located inside the outer pipe with the possibility of vertical movement, a drive rod connected to the bottom of the throttle sleeve, a drive sleeve located inside the outer tube with the possibility of vertical movement, located below the drive rod and having pushing blocks located at intervals around the circumference on the outer wall of the drive sleeve, and a drill bit connected to the lower part of the outer pipe, wherein the throttle sleeve is configured to move downwards by a predetermined distance when the flow rate of the fluid pumped into it reaches a predetermined value, and with the possibility of driving a drive rod to move it downwards and insert it into the drive sleeve to create a throttling effect, so that the fluid pushes the drive sleeve downwards to a predetermined position, and the pushing blocks push the corresponding cutting blocks in an outward direction to open them, wherein the throttle sleeve and the drive sleeve are designed with the possibility of moving upward and returning to the initial position after the pumping of the fluid medium has ceased, ensuring the retraction of the cutting blocks inward into the side wall of the outer pipe.

2. A multifunctional tool according to claim 1, wherein the throttle sleeve is a cylindrical structure with an open upper end and a lower end surface that has several throttle holes, and on the outer walls of the two ends of the throttle sleeve there are, respectively, an upper limiting ring and a lower limiting ring, on the inner wall of the outer pipe there is a retaining ring and a retaining part located at a distance from each other vertically, while the upper limiting ring and the lower limiting ring are located, respectively, on both sides of the retaining ring, an upper return spring is placed on the outer wall of the throttle sleeve, the two ends of which rest, respectively, against the upper limiting ring and the retaining ring, and the lower limiting ring is configured to move downwards to rest against the stop portion when the flow rate of the fluid reaches a predetermined value, and to rest against the stop ring after the throttle sleeve returns to its original position.

3. A multifunctional tool according to claim 1, in which a support ring is formed on the lower inner wall of the outer tube, on which several arc-shaped blocks are located at intervals around the circumference, several limiting plates are located at intervals around the circumference on the outer wall of the lower end of the drive sleeve, and a lower return spring is placed on the outer periphery of said arc-shaped blocks, wherein each limiting plate is inserted between two corresponding adjacent arcuate blocks with the possibility of vertical movement, and the two ends of the lower return spring rest, respectively, against the limiting plate and the support ring.

4. A multifunctional tool according to claim 1, in which a guide groove is located on the inner side of the cutting block, including an inclined groove and a flat groove connected vertically, wherein the lower wall of the inclined groove is an inner inclined surface, and the wall of the flat groove is a flat surface, wherein the lower outer wall of the pushing block is an outer inclined surface, the upper outer wall of the pushing block is a vertical flat surface, and said inclined groove has a shape corresponding to the shape of the pushing block, wherein, when the drive sleeve moves downward to a given position, the pushing block is inserted into the flat groove, wherein the vertical flat surface fits tightly against the wall of the flat groove.

5. The multifunctional tool according to item 1, in which several mounting holes are made on the outer wall of the outer pipe along the circumference, the upper end of each cutting block is connected to the outer pipe by means of a rotary shaft, and the axial direction of the rotary shaft is perpendicular to the axial direction of the outer pipe, and On the inner wall of the outer pipe, directly below the mounting hole, there is an inner inclined surface, and on the lower end surface of the cutting block there is an outer inclined surface, which is designed to fit against the inner inclined surface in a state when the cutting block is opened in the outward direction.

6. The multifunctional tool according to claim 2, wherein a locking pusher configured to have the possibility of elastic vertical movement and a locking stop rod configured to have the possibility of elastic radial movement are located in the side wall of the outer pipe, wherein the upper end of the locking pusher is configured to project upward beyond the stop portion, the lower end of the locking pusher has an upper inclined surface, and the locking stop rod is located below the locking pusher and has a lower inclined surface configured to interact with the upper inclined surface to ensure the possibility of the upper inclined surface adjoining the lower inclined surface, and a locking limiting hole is formed on the outer wall of the drive sleeve, and when the lower locking ring moves downward and rests against the locking part, it provides the ability to push the locking pusher downward, thereby providing the ability to insert the locking pusher into the locking limiting hole when the drive sleeve moves downward to a predetermined position.

7. The multifunctional tool of claim 6, wherein an axial mounting hole and a radial mounting hole are formed in the side wall of the outer pipe, wherein the upper end of the axial mounting hole passes upward through the stop portion, and the radial mounting hole communicates with the lower end of the axial mounting hole and passes radially through the inner wall of the outer pipe, wherein a stepped hole of increased diameter is formed at the first end of the axial mounting hole, a plug is installed in the end portion of the stepped hole, the upper end of the locking pusher passes through the plug with the possibility of vertical movement, the upper outer wall of the locking pusher has an annular first flange located below the plug, and a locking return spring is placed on the locking pusher, the two ends of which rest, respectively, against the first flange and against the lower projection of the stepped hole, wherein a mounting sleeve is located in the radial mounting hole, the locking thrust rod comprises a thrust pin and a locking pin located in the mounting sleeve, and a lower inclined surface is formed on the thrust pin, wherein the lower end of the locking pusher is designed with the possibility of being inserted into the mounting sleeve and resting against the lower inclined surface, the upper outer wall of the thrust pin has an annular second flange, a first spring is located between the second flange and the step in the mounting sleeve, a second spring is located between the thrust pin and the locking pin, and the locking pin is designed with the possibility of protruding radially inward and entering the fixation limiting hole.

8. The multifunctional tool of claim 2, wherein a drive head is connected to the lower end of the drive rod, the diameter of which is larger than the diameter of the drive rod, and the drive head is configured to move into the drive sleeve when the throttle sleeve moves downward.

9. The multifunctional tool according to claim 8, in which the inner wall of the upper end of the drive sleeve has an inwardly projecting flange with a reduced inner diameter, and when the throttle sleeve is moved downward by a given distance, the drive head is located inside the drive sleeve under the projecting flange, and when the drive sleeve is moved downward to a given position, the drive head is located within the projecting flange.

10. A multifunctional tool according to claim 8, in which an annular guide groove with a closed upper end and an open lower end is formed in the upper part of the outer pipe, and the upper part of the throttle sleeve is inserted into said annular guide groove with the possibility of vertical movement.

11. The multifunctional tool according to claim 10, in which a connecting sleeve is connected to the upper end of the drive sleeve, to the upper end of which a limiting block is connected, a central hole and several flow holes are formed in the limiting block, the diameter of the drive head is larger than the diameter of the central hole, the drive rod passes movably through the central hole, and the drive head is located below the limiting block, Moreover, a rupture disk is installed on the side wall of the throttle sleeve, and on the lower inner wall of the throttle sleeve there is a seat for the throttle ball.

12. A multifunctional tool according to claim 11, in which a check valve and a safety valve are located on the side wall of the outer pipe, which are located at a distance from each other vertically, wherein the safety valve is located facing the annular space between the outer pipe and the throttle sleeve, and the check valve is located above the upper limiting ring.

13. A multifunctional tool according to claim 1, in which a plurality of nozzle openings are formed in the lower end of the drill bit, which provide communication between the internal cavity of the drive sleeve and the outer wall of the lower end of the drill bit, and the nozzle openings have an equivalent diameter equal to or greater than 30 mm.

14. The multifunctional tool of claim 1, wherein the outer tube comprises an upper connector, a drive unit, an outer cylinder and a lower connector, connected sequentially from top to bottom, wherein the cutting unit is located on the outer cylinder, the throttle sleeve is located inside the upper connector, the drive rod is located inside the drive unit, the drive sleeve is located inside the outer cylinder, and the drill bit is connected to the bottom of the lower connector.

15. A method of continuous plugging and drilling with double hydraulic action, comprising: connecting the drill pipe to a multifunctional dual-acting hydraulic tool for continuous plugging and drilling, made according to any of paragraphs 1-14, to form a drill string and lowering said tool into the target plugging zone; pumping cement, starting the drilling mud pump to displace the cement slurry from the drill string after the cement pumping is completed, and raising the drill string to a safe position after the cement displacing operation is completed; starting the said tool after the cement slurry hardens; starting the pump to increase the flow rate to a predetermined value so that the lower end of the drive rod enters the drive sleeve, creating a throttling effect, resulting in a hydraulic force that pushes the drive sleeve down to a predetermined position; wherein the pushing block pushes the cutting block to open in an outward direction; and then initiating the drilling out of the plug; After completion of the plug drilling, lifting the drill string from the bottom of the well, pumping in drilling mud and performing work to seal the well and maintain pressure to check the success of the plugging; if plugging is unsuccessful, repeating cement pumping and drilling out the plug until plugging is successful; and execution of drilling operations.