Multiple activation hydraulic underreamer

Abstract

The present application belongs to the technical field of oil drilling equipment, and relates to a multiple-start hydraulic while-drilling reamer, mainly composed of a shell, a reamer assembly and a hydraulic starting assembly. The hydraulic starting assembly adopts a multiple-ball launching device or a hydraulic rotating device. The multiple-ball launching device is composed of a multiple-ball launching lower cover, a movable cavity, a lower end cover, a connecting cavity, a lower spring, a spring positioning block, a limiting pin, a limiting retainer ring, a spring positioning block pin, a primary starting ball and a secondary starting ball. The hydraulic rotating device is composed of a lower cover, a movable shaft, a positioning block, a positioning block pin, a spring retainer ring, a lower spring, a spring positioning block and a spring positioning block pin. The present application is controlled by differential pressure or pump starting and stopping, is simple to operate, can automatically retract the blade wing, can intermittently ream and drill in different stratum stages, and realizes multiple reaming.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil drilling equipment, and relates to a hydraulic drilling while expanding device capable of being started multiple times. BACKGROUND

[0002] Drilling while expanding is a technology of increasing the diameter of an expanding section on the basis of a whole drilling hole by using a drilling while expanding tool and a common drill bit, so that the diameter is no longer a single hole diameter. Compared with a traditional fixed exploration drilling tool, the technology has obvious advantages. At present, many foreign oil companies have carried out researches on the technology. The technology can effectively improve oil and gas exploration efficiency, optimize well structure of exploration drilling, and reduce overall exploration cost, etc. Domestic expanding devices generally have low wing strength, cannot be used intermittently, and may have the problem of wing failure to be retracted, which may cause serious drilling accidents. SUMMARY

[0003] The present application aims to provide a hydraulic drilling while expanding device capable of being started multiple times, and solve the problem that the prior art cannot be used while expanding and is used intermittently. By differential pressure or pump starting and stopping control, multiple drilling while expanding can be realized.

[0004] The technical scheme adopted by the present application is as follows:

[0005] The multiple-start hydraulic drilling reamer of the present application mainly consists of a shell, a reamer assembly and a hydraulic starting assembly. The lower end of the shell is provided with holes and threads for spring positioning block pins and limiting pins. The reamer assembly consists of a spring cavity, a stop ring, a cutter wing, a driving ring, a piston and a nozzle. The cutter wing and the nozzle are installed on the shell, the spring cavity and the piston are installed inside the shell, and the stop ring and the driving ring are installed on the left and right ends of the cutter wing respectively. The hydraulic starting assembly adopts a multiple-ball launching device or a hydraulic rotating device. The multiple-ball launching device consists of a multiple-ball launching lower cover, a movable cavity, a lower end cover, a connecting cavity, a lower spring, a spring positioning block, a limiting pin, a limiting ring, a spring positioning block pin, a first starting ball and a second starting ball. The outer end of the multiple-ball launching lower cover is threadedly connected with the shell, the outer thread at the lower end is connected with the inner thread of the lower end cover, the inner cavity has the movable cavity, the outer thread at the right end of the movable cavity is connected with the inner thread at the left end of the connecting cavity, the lower spring is installed outside the connecting cavity and fixed on the spring positioning block at the right end, the spring positioning block pin is installed on the positioning block, the outer thread at the right end of the connecting cavity is connected with the inner thread of the limiting ring, and the limiting pin is installed on the limiting ring. The hydraulic rotating device consists of a lower cover, a movable shaft, a positioning block, a positioning block pin, a spring ring, a lower spring, a spring positioning block and a spring positioning block pin. The outer end of the lower cover is threadedly connected with the shell, the inner cavity has the movable shaft, the positioning block is installed on the movable shaft, the positioning block is fixed by the positioning block pin and the shell, the spring ring is threadedly connected with the movable shaft, the lower spring is installed on the spring positioning block, the lower cover surface is provided with a lower cover flow channel hole, a lower cover straight groove and a lower cover straight edge end face, the positioning block surface is provided with a positioning block inclined groove, and the movable shaft surface is provided with a movable shaft flow channel hole, a movable shaft straight edge, a movable shaft inclined edge and a movable shaft straight edge end face.

[0006] When the hydraulic starting assembly adopts the multiple-ball launching device, the drilling fluid will flow out from the connecting cavity flow channel hole after the first starting ball is started. Three shunt holes are arranged at an interval of 120° in the circumferential direction and are opened at the first ball launching or the second ball launching. The drilling fluid flows into the shunt hole, flows through the flow channel to the inner cavity of the connecting cavity and then flows out from the connecting cavity flow channel hole to the bottom. According to the need, multiple similar connecting cavities can be designed and installed at the lower end of the connecting cavity to realize multiple starting reaming.

[0007] When the hydraulic starting assembly adopts the hydraulic rotating device, the movable shaft straight edge will move downward in the lower cover straight groove after the hydraulic starting, and the movable shaft will rotate relatively when the movable shaft inclined edge contacts the inclined groove of the positioning block. The movable shaft straight edge end face and the lower cover straight edge end face are provided with an inclined surface of (5-10)°, which facilitates the movable shaft straight edge to be pushed back into the next lower cover straight groove by the lower spring. The movable shaft flow channel hole has a larger hole size than the lower cover flow channel hole.

[0008] Compared with the prior art, the present application has the beneficial effects that: through differential pressure or open-stop pump control, the operation is simple, the blade wing can be automatically retracted, intermittent reaming while drilling or continuous drilling can be realized for different formation stages, and multiple reaming is realized. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a multiple-start hydraulic drilling reamer structure schematic diagram of the present application when the multiple ball launching device is adopted;

[0010] Figure 2 is a multiple-start hydraulic drilling reamer structure schematic diagram of the present application when the hydraulic rotary device is adopted;

[0011] Figure 3 is a multiple ball launching lower cover structure schematic diagram of the present application;

[0012] Figure 4 is a connection cavity structure schematic diagram of the present application;

[0013] Figure 5 is a shunt hole cross section schematic diagram obtained from the connection cavity transverse section A-A;

[0014] Figure 6 is a reamer structure schematic diagram when the reamer works after the first start ball is launched in the present application;

[0015] Figure 7 is a reamer structure schematic diagram when the reamer does not work after the first start ball is launched in the present application;

[0016] Figure 8 is a reamer structure schematic diagram when the reamer works after the second start ball is launched in the present application;

[0017] Figure 9 is a reamer structure schematic diagram when the reamer does not work after the second start ball is launched in the present application;

[0018] Figure 10 is a lower cover structure schematic diagram of the present application;

[0019] Figure 11 is an activity shaft structure schematic diagram of the present application;

[0020] Figure 12 is a positioning block structure schematic diagram of the present application;

[0021] Figure 13 is an activity cavity structure schematic diagram of the present application;

[0022] In the figure: 1. housing, 2. upper cover, 3. fixed shaft, 4. upper cover positioning pin, 5. upper spring, 6. spring cavity, 7. stop ring, 8. knife wing, 9. driving ring, 10. piston, 11. nozzle, 12. multiple ball throwing lower cover, 12a. multiple ball throwing lower cover flow hole, 12(2). lower cover, 12(2)a. lower cover flow hole, 12(2)b. lower cover straight slot, 12(2)c. lower cover straight edge end face, 13. movable cavity, 13a. movable cavity flow port, 14. lower end cover, 15. connecting cavity, 15a. connecting cavity shunt hole, 15b. connecting cavity flow channel, 15c. connecting cavity flow hole, 16. lower spring, 17. spring positioning block, 18. limit pin, 19. limit stop ring, 20. spring positioning block pin, 21. fixed shaft cap, 22. upper cover positioning pin, 23. first start ball, 24. second start ball, 25. spring stop ring, 26. positioning block, 26a. positioning block inclined slot, 27. movable shaft, 27a. movable shaft flow hole, 27b. movable shaft straight edge, 27c. movable shaft inclined edge, 27d. movable shaft straight edge end face, 28. positioning block pin. DETAILED DESCRIPTION

[0023] The application is further described below in conjunction with the drawings and specific embodiments:

[0024] Referring to the drawings Figure 1 and the drawings Figure 2The multiple-start hydraulic drilling reamer of the application is mainly composed of a shell, a reamer assembly and a hydraulic starting assembly, wherein the lower end of the shell 1 is provided with holes and threads for spring positioning block pin 20 and limiting pin 18; the reamer assembly is composed of spring cavity 6, stop ring 7, blade wing 8, driving ring 9, piston 10 and nozzle 11, wherein the blade wing 8 and nozzle 11 are installed on the shell 1, the spring cavity 6 and piston 10 are installed inside the shell 1, and the stop ring 7 and driving ring 9 are installed on the left and right ends of the blade wing 8 respectively; the hydraulic starting assembly adopts multiple ball throwing device or hydraulic rotating device, wherein the multiple ball throwing device is composed of multiple ball throwing lower cover 12, movable cavity 13, lower end cover 14, connecting cavity 15, lower spring 16, spring positioning block 17, limiting pin 18, limiting block ring 19, spring positioning block pin 20, primary starting ball 23 and secondary starting ball 24, the outer end of the multiple ball throwing lower cover 12 is threadedly connected with the shell 1, the lower end outer thread is connected with the inner thread of the lower end cover 14, the inner cavity has movable cavity 13, the outer thread of the right end of the movable cavity 13 is connected with the inner thread of the left end of the connecting cavity 15, the connecting cavity 15 is externally provided with the lower spring 16, the right end of the lower spring is fixed on the spring positioning block 17, the spring positioning block pin 20 is installed on the positioning block, the right end outer thread of the connecting cavity is connected with the inner thread of the limiting block ring 19, and the limiting pin 18 is installed on the limiting block ring; wherein the hydraulic rotating device is composed of lower cover 12(2), movable shaft 27, positioning block 26, positioning block pin 28, spring block ring 25, lower spring 16, spring positioning block 17 and spring positioning block pin 20, the outer end of the lower cover 12(2) is threadedly connected with the shell 1, the inner cavity has movable shaft 27, the positioning block 26 is installed on the movable shaft, the positioning block is fixedly connected with the shell 1 through the positioning block pin 28, the spring block ring 25 is threadedly connected with the movable shaft 27, the lower spring 16 is installed on the spring positioning block 17, the surface of the lower cover 12(2) is processed with lower cover flow channel hole 12(2)a, lower cover straight groove 12(2)b and lower cover straight edge end surface 12(2)c, the surface of the positioning block 26 is processed with positioning block inclined groove 26a, and the surface of the movable shaft 27 is processed with movable shaft flow channel hole 27a, movable shaft straight edge 27b, movable shaft inclined edge 27c and movable shaft straight edge end surface 27d.

[0025] By the attached Figure 4 , attached Figure 5 , attached Figure 6 and attached Figure 8As shown, when the hydraulic starting assembly adopts the multiple ball launching device, after the first starting ball 23 is launched, the drilling fluid will flow out from the connecting cavity flow channel hole 15c; three shunt holes 15a are arranged at an interval of 120° in the circumference; the drilling fluid flows out from the movable cavity flow channel opening 13a, flows into the shunt hole 15a, flows through the flow channel 15b to the inner cavity of the connecting cavity 15 and then flows out from the connecting cavity flow channel hole 15c to the bottom, according to the need, the multiple ball launching device can be designed and installed with multiple similar connecting cavities (15) at the lower end of the connecting cavity (15) to realize multiple starting and reaming.

[0026] As shown in the accompanying drawings Figure 2 , the accompanying drawings Figure 10 , the accompanying drawings Figure 11 , the accompanying drawings Figure 12 , when the hydraulic starting assembly adopts the hydraulic rotating device, after the hydraulic starting, the straight edge 27b of the movable shaft moves downward in the straight groove 12(2)b of the lower cover until the inclined edge 27c of the movable shaft contacts the inclined groove 26a of the positioning block, the movable shaft rotates relatively; the straight edge end surface 27d of the movable shaft and the straight edge end surface 12(2)c of the lower cover are processed with a (5-10)° inclined surface, which facilitates the straight edge 27b of the movable shaft to move back to the next straight groove 12(2)b of the lower cover by the lower spring 16; the aperture of the flow channel hole 27a of the movable shaft is larger than the aperture size of the flow channel hole 12(2)a of the lower cover.

[0027] The working principle of the hydraulic starting assembly when the multiple ball launching device is adopted in the present application is as follows:

[0028] As shown in the accompanying drawings Figure 1 , the initial state of the reamer. After the first starting ball 23 is launched, due to the pressure of the drilling fluid under the pressure holding condition, the movable cavity 13 and the connecting cavity 15 move downward to compress the lower spring 16, part of the drilling fluid flows through the multiple ball launching lower cover flow channel hole 12a, the nozzle 11 and the piston 10, acts on the upward movement of the piston, the piston 10 pushes the driving ring 9 to move upward together, the blade wing 8 is pushed by the driving ring 9 to open outward and upward along the sliding groove on the shell 1, the stop ring 7 also moves upward to compress the upper spring 5, until it contacts with the shell 1, at this time, the blade wing 8 opens to the maximum stroke position as shown in the accompanying drawings Figure 6 . Another part of the liquid flows through the connecting cavity 15 from the connecting cavity flow channel hole 15c. Reduce the pump pressure or stop the pump, the upper and lower springs make the reamer to the position as shown in the accompanying drawings Figure 7 . When the second starting ball 24 needs to be launched, the same as the above Figure 8 , at this time, another part of the liquid will flow out from the movable cavity flow channel opening 13a, flow into the shunt hole 15a, flow through the flow channel 15b to the inner cavity of the connecting cavity 15 and then flow out from the connecting cavity flow channel hole 15c to the bottom. Again, reduce the pump pressure or stop the pump, the reamer is in the closed state as shown in the accompanying drawings Figure 9 .

[0029] The working principle of this invention when the hydraulic starting assembly uses a hydraulic rotating device is as follows:

[0030] like Figure 2 As shown, this is the initial state of the reamer. When the pump pressure or flow rate is increased, the straight edge 27b of the movable shaft will move downward in the straight groove 12(2)b of the lower cover until the inclined edge 27c of the movable shaft contacts the inclined groove 26a of the positioning block. The movable shaft will rotate relative to the reamer. After the movable shaft 27 rotates a certain angle, the end face 27d of the straight edge of the movable shaft stops on the end face 12(2)c of the straight edge of the lower cover. At this time, the flow channel hole 27a of the movable shaft is aligned with the flow channel hole 12(2)a of the lower cover. A portion of the drilling fluid will flow into the piston 10 from the aligned flow hole, acting on the piston to move upward. The piston 10 pushes the drive ring 9 to move upward together. The blade 8 will then open upward and outward along the groove on the housing 1 under the push of the drive ring 9. The stop ring 7 will also move upward to compress the upper spring 5 until it contacts the housing 1. At this time, the blade 8 opens to its maximum stroke. Another portion of the drilling fluid will flow downward from the inner cavity of the movable shaft 27. When the pump pressure or flow rate decreases, the movable shaft straight edge 27b is pushed back into the next lower cover straight groove 12(2)b by the lower spring 16, at which time the expander is in the closed state. The next time the expander is started, it is in the same way as above.

[0031] The specific embodiments described above are for illustrative purposes only and are not intended to limit the scope of this patent. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this patent shall fall within the protection scope of this patent system.

Claims

1. A hydraulic reamer that can be started multiple times while drilling, mainly composed of a housing, a reamer assembly, and a hydraulic starting assembly, is characterized by: The lower end of the housing (1) is machined with holes and threads for spring positioning block pins (20) and limit pins (18); the eye expander assembly consists of a spring cavity (6), a stop ring (7), a blade (8), a drive ring (9), a piston (10), and a nozzle (11), wherein the blade (8) and the nozzle (11) are mounted on the housing (1), the spring cavity (6) and the piston (10) are mounted inside the housing (1), and the stop ring (7) and the drive ring (9) are respectively mounted on the left and right ends of the blade (8); the hydraulic start assembly adopts a multiple ball throwing device or a hydraulic rotation device, wherein the multiple ball throwing device consists of a multiple ball throwing lower cover (12), a movable The structure consists of a cavity (13), a lower end cover (14), a connecting cavity (15), a lower spring (16), a spring positioning block (17), a limiting pin (18), a limiting retaining ring (19), a spring positioning block pin (20), a primary start ball (23), and a secondary start ball (24). The outer end of the lower end cover (12) for multiple ball throwing is threaded to the shell (1), and the lower end external thread is threaded to the lower end cover (14). The inner cavity has a movable cavity (13), and the right end external thread of the movable cavity (13) is threaded to the left end internal thread of the connecting cavity (15). A lower spring (16) is installed on the outside of the connecting cavity (15), and the right end of the lower spring... Fixed on the spring positioning block (17), the positioning block is equipped with a spring positioning block pin (20), the external thread of the right end of the connecting cavity is connected to the internal thread of the limiting retaining ring (19), and the limiting retaining ring is equipped with a limiting pin (18); the hydraulic rotating device consists of a lower cover (12(2)), a movable shaft (27), a positioning block (26), a positioning block pin (28), a spring retaining ring (25), a lower spring (16), a spring positioning block (17), and a spring positioning block pin (20). The outer end of the lower cover (12(2)) is threaded to the shell (1), and the inner cavity has a movable shaft (27), on which the positioning block (26) is installed. The positioning block is fixed by connecting to the housing (1) through the positioning block pin (28). The spring retaining ring (25) is threadedly connected to the movable shaft (27). The lower spring (16) is installed on the spring positioning block (17). The surface of the lower cover (12(2)) is machined with a lower cover flow channel hole (12(2)a), a lower cover straight groove (12(2)b) and a lower cover straight edge end face (12(2)c). The surface of the positioning block (26) is machined with a positioning block inclined groove (26a). The surface of the movable shaft (27) is machined with a movable shaft flow channel hole (27a), a movable shaft straight edge (27b), a movable shaft inclined edge (27c) and a movable shaft straight edge end face (27d).

2. The multi-start hydraulic reamer as described in claim 1, characterized in that: When the hydraulic starting assembly uses a multiple ball-dropping device, after the starting ball (23) is started, the drilling fluid will flow out from the flow channel hole (15c) of the connecting cavity; three diversion holes (15a) are arranged at circumferential intervals of 120°, which are opened during the first or second ball drop, and the drilling fluid flows in from the diversion hole, flows through the flow channel (15b) to the inner cavity of the connecting cavity (15) and then flows out from the flow channel hole (15c) of the connecting cavity to the bottom; as needed, this multiple ball-dropping device can design and install multiple similar connecting cavities (15) at the lower end of the connecting cavity (15) to achieve multiple start-up enlargement.

3. The multi-start hydraulic reamer as described in claim 1, characterized in that: When the hydraulic starting assembly uses a hydraulic rotating device, after hydraulic starting, the movable shaft straight edge (27b) will move downward in the lower cover straight groove (12(2)b) until the movable shaft inclined edge (27c) contacts the positioning block inclined groove (26a), at which point the movable shaft (27) will rotate relative to each other; the movable shaft straight edge end face (27d) and the lower cover straight edge end face (12(2)c) are machined with an inclined surface of (5~10)°, which makes it easy for the movable shaft straight edge (27b) to be pushed back by the lower spring (16) to move into the next lower cover straight groove (12(2)b); the opening of the movable shaft flow channel hole (27a) is larger than the opening size of the lower cover flow channel hole (12(2)a).

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