CN110056309B - Fixed-shaft rotary positive displacement power tool - Google Patents

Abstract

The present invention is a fixed-axis rotating positive displacement power tool, including an outer cylinder, an inner rotor, an outer rotor, a stop ring, a stop ring sleeve, a circlip for a hole, a TC bearing outer sleeve, an upper TC bearing inner sleeve, and a lower TC bearing inner sleeve , eccentric bearing inner sleeve and eccentric bearing outer sleeve; the upper end of the outer cylinder is connected to the drill string; the inner rotor is installed in the outer rotor through the internal meshing of the helical teeth and forms at least one conjugated closed cavity with the outer rotor. The yoke seal chamber moves down continuously along the axial direction to ensure that the working medium (drilling fluid) moves downward in sequence; the upper and lower ends of the inner rotor are provided with eccentric bearings. The eccentric bearings are composed of an eccentric bearing inner sleeve and an eccentric bearing outer sleeve. The center distance between the inner rotor and the outer rotor; the upper and lower parts of the outer rotor are provided with TC bearings; the invention can be used as a downhole power tool, and the inner rotor installed in the eccentric bearing rotates as a downhole tool under the action of hydraulic pressure. The combination provides rotational power, eliminating the negative effects of centrifugal force.

Description

Fixed axis rotary positive displacement power tools

technical field

The invention relates to the technical field of drilling engineering in the petroleum and natural gas industry, in particular to an underground power tool.

Background technique

At present, the power drilling tools used in oil and gas wells at home and abroad mainly include: screw drilling tools, turbo drilling tools, electric drilling tools, etc. The research and application of various drilling tools at home and abroad are different. In addition, the advantages and disadvantages of various drilling tools are also different. For example, the working torque of screw drilling tools is related to pressure drop and structure but not to speed. , but there is lateral vibration; although the turbo drilling tool has the soft characteristics of high speed and large torque, and has no advantages such as lateral vibration, but the output speed is too high and the size of the whole machine is too long; the output speed of the electric drilling tool is high, and the multi-stage The reducer has a complex structure, poor reliability, and high requirements for the insulation and sealing performance of the underground motor. In order to solve the above problems, a fixed-axis rotary positive displacement power tool is hereby proposed to solve the shortcomings of the above-mentioned technologies while retaining most of the above-mentioned advantages.

SUMMARY OF THE INVENTION

The present invention provides a fixed-axis rotary positive displacement power tool to solve the problem of lateral vibration of the downhole power tool in the prior art.

In order to solve the above problems, according to one aspect of the present invention, the present invention provides a fixed-axis rotary positive displacement power tool, comprising an outer cylinder, an outer rotor, an inner rotor, a snap ring, a snap ring sleeve, a circlip for a hole, and a TC bearing The outer sleeve, the upper TC bearing inner sleeve, the lower TC bearing inner sleeve, the eccentric bearing inner sleeve, and the eccentric bearing outer sleeve are composed; the upper end of the outer cylinder is connected to the drill string; Conjugate closed cavity to accommodate the working medium (drilling fluid), the continuous rotation of the inner rotor can cause the conjugated sealed cavity to move down continuously along the axial direction to ensure that the working medium (drilling fluid) advances in sequence; the upper and lower ends of the inner rotor are provided with Eccentric bearing, eccentric bearing consists of eccentric bearing inner sleeve and eccentric bearing outer sleeve, eccentric bearing eccentric distance is equal to the center distance between inner rotor and outer rotor; upper TC bearing and lower TC bearing are respectively provided on the upper and lower parts of outer rotor.

Further, the upper part and the lower part of the outer cylinder are provided with conical internal threads, the inner cavity of the upper part and the lower part of the outer cylinder is provided with a retaining ring groove, the upper retaining ring groove is below the retaining ring groove, and the lower retaining ring groove is above the lower retaining ring groove. There is a retaining ring groove, and a groove matching the small boss on one side of the retaining ring is arranged between the retaining ring groove and the retaining ring groove to prevent the eccentric bearing housing from rotating.

Further, the upper and lower parts of the inner rotor are provided with a central hole, and the upper and lower parts of the inner rotor are both provided with at least one through-flow hole at the central hole; the middle of the inner rotor is a screw structure; the upper end of the inner rotor is provided with The inner hexagonal structure is provided; the lower end of the inner rotor is provided with a thread, and the upper part of the thread is provided with a conical surface.

The beneficial effects of adopting the above-mentioned further technical solutions are: the center hole and the through hole of the inner rotor can guide the drilling fluid, the conical surface on the upper part of the thread can ensure the coaxiality with the lower end connecting piece, and the upper end of the inner rotor can be concentric. The inner hexagon structure is convenient for the wrench to screw the inner rotor into the outer rotor.

Further, the outer rotor is a shaft sleeve type structure, the upper end of the outer rotor is provided with a positioning step and an inner thread, and the lower end is provided with a positioning step and an outer thread; the outer rotor is formed with the inner rotor through the glue injection process. Matching screw surface structure.

The beneficial effects of the above-mentioned further technical solutions are: the outer rotor can realize the axial positioning of the upper and lower ends and assemble the TC bearings in a narrow radial space, thereby ensuring the rotation of the fixed axis of the outer rotor; Fixed axis rotation.

Further, one end of the eccentric bearing shell is sintered with a cemented carbide ring, and the other end is provided with two equal-width grooves; the middle of the eccentric bearing shell is provided with a through hole eccentric to the outer diameter, and a hard alloy ring is sintered in the through hole. alloy sleeve; one end of the eccentric bearing outer sleeve sintered with a cemented carbide ring is provided with steps; the eccentric bearing outer sleeve is provided with a number of through-flow holes; Alloy sleeve; the eccentric bearing inner sleeve and the eccentric bearing outer sleeve form an eccentric bearing, and the eccentric distance of the eccentric bearing is equal to the center distance between the inner rotor and the outer rotor.

The beneficial effects of adopting the above-mentioned further technical solutions are: the sintered cemented carbide ring at one end of the outer casing of the eccentric bearing cooperates with the cemented carbide ring sintered at the upper end of the inner sleeve of the upper TC bearing to bear the axial force during the rotation of the outer rotor; The two symmetrical equal-width grooves at the other end of the eccentric bearing shell can limit the rotation of the eccentric bearing shell under the action of the stop ring; the cemented carbide sleeve sintered between the eccentric bearing inner sleeve and the eccentric bearing shell can play a role in the harsh underground environment. The role of bearings.

Further, the upper TC bearing inner sleeve is a shaft sleeve type structure, the upper part of which is sintered with a cemented carbide sleeve, a positioning step is arranged outside the middle, and an external thread is arranged at the lower end; the upper end of the upper TC bearing inner sleeve is sintered with cemented carbide Ring; the lower end of the inner sleeve of the upper TC bearing is connected with the upper end of the outer rotor by threads, and the upper part of the inner sleeve of the upper TC bearing is matched with the outer sleeve of the TC bearing to form the upper TC bearing.

Further, the lower TC bearing inner sleeve is a shaft sleeve type structure, the lower part of which is sintered with a cemented carbide sleeve, and the lower end is provided with threads; the lower end of the upper TC bearing inner sleeve is sintered with a cemented carbide ring; the lower TC bearing inner sleeve is sintered with a cemented carbide ring; It is connected with the lower end of the outer rotor through threads, and the lower part of the inner sleeve of the lower TC bearing is matched with the outer sleeve of the TC bearing to form the lower TC bearing.

The beneficial effects of adopting the above-mentioned further technical solutions are: the upper TC bearing inner sleeve cooperates with the TC bearing outer sleeve to form a wear-resistant upper TC bearing; the lower TC bearing inner sleeve cooperates with the TC bearing outer sleeve to form a wear-resistant lower TC bearing, effectively ensuring the external The fixed axis of the rotor rotates.

The beneficial effects of the present invention are:

The invention can be directly used in the drilling tool assembly, and the upper and lower ends of the outer cylinder are connected in the downhole drilling tool assembly; the inner rotor eccentric to the axis of the casing and the outer rotor concentric to the axis of the outer cylinder are respectively rotated on fixed axes under the action of the drilling fluid pressure. , the inner rotor transmits power to the lower end through the thread at the lower end of the inner rotor; the rotational speed of the fixed-axis rotating positive displacement power tool is only related to the displacement and structure, and has nothing to do with its working conditions (weight on bit, torque, etc.); working torque and pressure drop It is related to the structure and has nothing to do with the rotation speed; it overcomes the shortcomings of high rotation speed and low torque of the turbo drilling tool, and has the characteristics of low rotation speed and large torque, and is especially suitable for drilling operations, especially the fixed-axis rotary positive displacement power tool. It reduces the lateral vibration caused by the conventional screw motor, reduces the negative impact caused by the lateral vibration of the rotor, increases the life of the rubber, and improves the drilling efficiency.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a cross-sectional structural diagram of a fixed-axis rotary positive displacement power tool of the present invention.

FIG. 2 is a cross-sectional view along the A-A direction in FIG. 1 .

FIG. 3 is a cross-sectional view along the B-B direction in FIG. 1 .

FIG. 4 is a cross-sectional structural view of the eccentric bearing in the present invention.

FIG. 5 is a schematic view of the structure of the eccentric bearing in the present invention.

6 is a cross-sectional structural view of the upper TC bearing in the present invention.

7 is a cross-sectional structural view of the lower TC bearing in the present invention.

FIG. 8 is a schematic structural diagram of the stop ring and the stop ring sleeve in the present invention.

FIG. 9 is a structural diagram of an embodiment of the present invention arranged on an axial impactor.

FIG. 10 is a structural diagram of an embodiment of the present invention arranged in a downhole power drilling tool.

In the picture: 1-outer cylinder, 2-outer rotor, 3-inner rotor, 4-stop ring, 5-stopper ring sleeve, 6-circlip for hole, 7-TC bearing jacket, 8-upper TC bearing inner Sleeve, 9-lower TC bearing inner sleeve, 10-eccentric bearing inner sleeve, 11-eccentric bearing outer sleeve, 01-fixed-axis rotary positive displacement power tool, 02-impact assembly, 03-coupling assembly, 04-transmission Shaft assembly, 05-drill.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to FIGS. 1 to 10 in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1, the present invention provides a fixed-axis rotary positive displacement power tool, including an outer cylinder 1, an inner rotor 3, an outer rotor 2, a stop ring 4, a stop ring sleeve 5, a circlip 6 for holes, and a TC bearing The outer sleeve 7, the upper TC bearing inner sleeve 8, the lower TC bearing inner sleeve 9, the eccentric bearing inner sleeve 10, and the eccentric bearing outer sleeve 11 are composed; the upper end of the outer cylinder 1 is connected to the drill string; as shown in Figures 2 and 3, the The inner rotor 3 is installed in the outer rotor 2 through the internal meshing of the helical teeth and forms at least one conjugated closed cavity with the outer rotor 2. The upper and lower ends of the inner rotor 3 are provided with eccentric bearings; the eccentric bearing inner sleeve 10 and the eccentric bearing outer sleeve 11 is composed of an eccentric bearing, and the eccentric distance of the eccentric bearing is equal to the center distance between the inner rotor 3 and the outer rotor 2; the upper and lower parts of the outer rotor 2 are respectively provided with an upper TC bearing and a lower TC bearing; the snap rings 4 are paired The use is placed on the outside of the eccentric bearing, the retaining ring sleeve 5 is stuck on the retaining ring 4, and the retaining ring is installed in the retaining ring groove to limit the movement of the retaining ring sleeve 5; in this way, the inner rotor 3 is screwed into the inner hexagonal structure at the upper end of the inner rotor 3 Inside the outer rotor 2, the section curve of the overlapping part of the inner rotor 3 and the outer rotor 2 is a pair of conjugate curves, which meets the requirements of gear transmission and the sealing requirements of the positive displacement motor. The inner rotor 3 and the outer rotor 2 form a pair of conjugate curves. Internal meshing gear set, when the drilling fluid enters the tool, the inner rotor 3 rotates as a fixed shaft under the limitation of the eccentric bearings at both ends and transmits power to the lower end, while the outer rotor 2 is fixed under the limitation of the upper TC bearing and the lower TC bearing The shaft rotates; as shown in Figures 1 and 8, the eccentric bearings are installed at the upper and lower ends of the inner rotor 3, the stop ring 4 is placed on the outside of the eccentric bearing, the stop ring sleeve 5 is clamped to the stop ring 4, and the hole is with a circlip 6 Installed in the retaining ring groove to limit the movement of the stop ring sleeve 5; in this way, the fixed-axis positive displacement power impact tool can be directly installed in a conventional drilling tool assembly.

As shown in Figures 4 and 5, the eccentric bearing consists of an eccentric bearing outer sleeve 11 and an eccentric bearing inner sleeve 10. One end of the eccentric bearing outer sleeve 11 is sintered with a cemented carbide ring, and the other end is provided with two equal-width grooves The center of the eccentric bearing shell 11 is provided with a through hole eccentric to the outer diameter, and a cemented carbide sleeve is sintered in the through hole; the end of the eccentric bearing shell 11 sintered with a cemented carbide ring is provided with a step; the eccentric bearing The outer casing 11 is provided with a number of through-flow holes; the eccentric bearing inner casing 10 is of a shaft-sleeve type structure, and a cemented carbide sleeve is sintered on the outside thereof. In this way, the cemented carbide ring sintered at one end of the eccentric bearing outer sleeve 11 cooperates with the cemented carbide ring sintered at the upper end of the upper TC bearing inner sleeve 8 to bear the axial force during the rotation of the outer rotor 2; The two equal-width grooves at one end can limit the rotation of the eccentric bearing shell 11, the through-holes provided in the eccentric bearing shell 11 can guide drilling fluid, and the sintered cemented carbide sleeves between the eccentric bearing inner shell 10 and the eccentric bearing shell 11 can be The harsh downhole environment acts as a bearing.

As shown in Figures 6 and 7, the upper TC bearing inner sleeve 8 is a shaft sleeve type structure, the upper part is sintered with a cemented carbide sleeve, a positioning step is arranged outside the middle, and an external thread is arranged at the lower end; The upper end of the sleeve 8 is sintered with a cemented carbide ring, and the upper part of the upper TC bearing inner sleeve 8 cooperates with the TC bearing outer sleeve 7 to form the upper TC bearing. The lower TC bearing inner sleeve 9 is a shaft sleeve type structure, the lower part is sintered with a cemented carbide sleeve, and the lower end is internally provided with threads; the lower end of the upper TC bearing inner sleeve 8 is sintered with a cemented carbide ring, and the lower TC bearing inner sleeve 9 The lower part cooperates with the TC bearing housing 7 to form a lower TC bearing. In this way, the upper TC bearing and the lower TC bearing work together to make the outer rotor 2 rotate on a fixed axis and limit its axial movement; the tiny gap existing between the upper TC bearing inner sleeve 8 and the TC bearing outer sleeve 7 can flow through the drilling fluid to the upper The TC bearing is cooled, and at the same time, the drilling fluid flowing between the upper TC bearing inner sleeve 8 and the TC bearing outer sleeve 7 also flows through the gap between the outer rotor 2 and the outer cylinder 1 to cool the outer rotor 2 .

Refer to Figure 9 for the structural diagram of the present invention as a power in a downhole axial impactor. The impact assembly 02 is threadedly connected to the lower end of the casing in the fixed-axis rotary positive displacement power tool 01. During drilling operations, the inner rotor drives the impact When the fixed axis of the moving plate in the assembly 02 rotates, the drilling fluid flow area between the moving plate and the static plate changes, resulting in a water hammer phenomenon, which further generates axial impact, improves the rock breaking efficiency of the drill bit and reduces the stick-slip vibration of the drill string.

Refer to Figure 10 for a structural diagram of the present invention as a power in an underground power drilling tool. The coupling assembly 03 is installed at the lower end of the inner rotor 3 in the fixed-axis rotary positive displacement power tool 01, and the transmission shaft assembly 04 is further installed in sequence. With the drill bit 05; during the drilling process, the fixed-axis rotary positive displacement power tool provides power for the drill bit to break the rock. It has the characteristics of low speed and high torque of the conventional screw motor, and avoids the negative effects caused by the radial vibration when the conventional screw motor is working. influences.

The fixed-axis rotary positive displacement power tool of the present invention can also be used as a downhole power motor to be arranged on other downhole tools.

In the present invention, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout of Figure 1 in the specification. For example, the positional relationship of front, rear, left, right, upper, lower and middle Determined according to the layout of FIG. 1 of the specification, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore It should not be construed as a limitation of the present invention.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Claims (5)

1. A fixed-axis rotary positive displacement power tool (01), including an outer cylinder (1), an inner rotor (3), an outer rotor (2), a stop ring (4), a stop ring sleeve (5), and a hole card A spring (6), a TC bearing outer sleeve (7), an upper TC bearing inner sleeve (8), a lower TC bearing inner sleeve (9), an eccentric bearing inner sleeve (10), and an eccentric bearing outer sleeve (11) are composed; the outer cylinder (1) The upper end is connected to the drill string; the inner rotor (3) is installed in the outer rotor (2) through the internal meshing of the helical teeth and forms at least one conjugated closed cavity with the outer rotor (2), and the inner rotor (3) is up and down. Eccentric bearings are provided at both ends; the eccentric bearing inner sleeve (10) and the eccentric bearing outer sleeve (11) form an eccentric bearing, and the eccentric distance of the eccentric bearing is equal to the center distance between the inner rotor (3) and the outer rotor (2); The upper and lower parts of the outer rotor (2) are respectively provided with an upper TC bearing and a lower TC bearing; the snap rings (4) are used in pairs and placed on the outside of the eccentric bearings, and the snap ring sleeve (5) is stuck to the snap ring ( 4), the circlip (6) for the hole is installed in the groove of the circlip to limit the movement of the retaining ring sleeve (5). 2. The fixed-axis rotary positive displacement power tool according to claim 1, wherein the outer rotor (2) is a bushing type structure, and the upper end of the outer rotor (2) is provided with a positioning step and an inner thread; A positioning step and an external thread are arranged outside the lower end of the outer rotor (2); a screw surface structure matched with the inner rotor (3) is formed inside the outer rotor (2) through a glue injection process. 3. The fixed-axis rotary positive displacement power tool according to claim 1, wherein one end of the eccentric bearing shell (11) is sintered with a cemented carbide ring, and the other end is provided with two equal-width grooves; A through hole eccentric to the outer diameter is provided in the middle of the bearing outer casing (11), and a cemented carbide sleeve is sintered in the through hole; the end of the eccentric bearing outer casing (11) sintered with a cemented carbide ring is provided with a step; the eccentric bearing is provided with a step; The outer sleeve (11) is provided with a plurality of through-flow holes; the eccentric bearing inner sleeve (10) is of a shaft-sleeve type structure, and a cemented carbide sleeve is sintered on the outside thereof. 4. The fixed-axis rotary positive displacement power tool according to claim 1, characterized in that the upper TC bearing inner sleeve (8) is a shaft sleeve type structure, the upper part of which is sintered with a cemented carbide sleeve, and the middle and outer parts are provided with positioning The lower end is provided with an external thread; the upper end of the upper TC bearing inner sleeve (8) is sintered with a cemented carbide ring. 5. The fixed-axis rotary positive displacement power tool according to claim 1, wherein the lower TC bearing inner sleeve (9) is a shaft sleeve type structure, the lower part is sintered with a cemented carbide sleeve, and the lower end is internally provided with threads; A cemented carbide ring is sintered at the lower end of the upper TC bearing inner sleeve (8).

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