CN112096328A - Well wall supporting mechanism while drilling in well - Google Patents

Abstract

An in-well supporting mechanism along the drilling wall belongs to the technical field of drilling tools, and is composed of a casing and a hydraulic support component. When the force support expands to a certain extent, it will be in close contact with the wellbore wall. The support mechanism in the well is supported with the wellbore wall. The high-pressure micro-pump is controlled to retract the elastic hydraulic support. The pressure of the high-pressure micro-pump can also be maintained by the micro-accumulator. The invention can realize that the self-propelled self-direction-changing steerable drilling system supports the well wall to generate sufficient friction force when feeding is required, so as to provide the feeding of the lower drilling tool. The reaction force has a retraction function at the same time, does not affect the feeding of the upper drilling tool, and provides a new idea and direction for the support technology in the well or in the pipe, which is very innovative and has a wide range of applications.

Description

An in-well wall supporting mechanism with drilling

technical field

The invention belongs to the technical field of drilling tools, and particularly relates to an in-well wall supporting mechanism for self-propelled and self-direction-changing steerable drilling systems.

Background technique

Although the downhole torque self-balancing wireline drilling tool can fundamentally solve the back torque damage caused by the rotary drilling of the drill string, change the disturbance intensity of the unidirectional rock fragmentation of the drill bit to the surrounding rock, and simplify the surface drilling equipment and supporting tools and process methods, To achieve the purpose of less accidents in the well, low drilling cost, low energy consumption and high drilling efficiency, but only vertical self-weight pressurized feeding, unable to self-pressurize and unable to directional drilling.

In order to realize the active pressurization of the drill pipeless drilling tool in the well, the drilling tool in the well must have the ability to support the well wall. After investigation, the well wall support mechanism proposed by NASA in the patented self-propelled deep hole drilling robot adopts the The support method of the robotic arm is supported by the well wall, but it is easy to be stuck by the cuttings, so that the drilling tool cannot be fed mechanically. For details, see U.S. Patent US7055625B1; the SEAVO ground robot proposed by Japan uses a balloon-type support mechanism and hole wall support, but The robot can only drill in softer soil or mud, and cannot circulate drilling fluid.

In summary, there is an urgent need for an in-well drilling tool support mechanism capable of circulating drilling fluid, which is in close contact with the wellbore when necessary, and provides a reaction force when the in-well drilling tool is traveling and feeding.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an in-well drilling wall support mechanism adapted to the self-propelled self-direction-changing steerable drilling system. When it is in close contact with the well wall, it provides the reaction force of the drilling tool feeding. At the same time, it also has a retraction function to ensure that the upper drilling tool can continue to travel downwards, so as to achieve the purpose of continuous feeding of the overall drilling system.

The technical scheme adopted by the present invention to achieve the above purpose is: an in-well supporting mechanism along the drilling wall, which is composed of a casing and a hydraulic support assembly;

The outer shell is a cylindrical shell, with a hollow channel in the middle, an annular groove on the upper part, a plurality of inner cavities distributed circumferentially on the lower part, and a plurality of sidewall grooves distributed circumferentially on the outer side wall, and there are vertical grooves between the annular groove and the inner cavity. Straight channel, there is an L-shaped channel between the annular groove and the sidewall groove, in addition, a plurality of oval through holes are distributed around the hollow channel;

The hydraulic support component includes an elastic hydraulic support, a high-pressure thin tube, a high-pressure micro-pump and a micro-accumulator. The elastic hydraulic support is an elastic cylindrical cavity with a cavity inside, and the elastic cylindrical cavity is filled with For the pressure liquid, the cavity is fixed in the groove of the side wall of the casing, and the upper L-shaped pipe passes through the L-shaped channel; the high-pressure thin tube is a rigid hollow thin tube, which is connected to the elastic hydraulic support and the high-pressure micro-pump; the high-pressure micro-pipe The pump is a cylindrical micro-pump with high pressure. It has the characteristics of small volume, high pressure, stable operation and convenient installation. It can realize the suction and ejection functions of high-pressure liquid. It is installed in the annular groove of the shell; The micro-accumulator is a cylindrical micro-energy storage device, which is fixed at the bottom of the inner cavity of the shell; the high-pressure micro-pump and the micro-accumulator are connected in turn through a high-pressure thin tube. The elastic hydraulic support, the high-pressure thin tube, the high-pressure micro-pump and the micro-accumulator form a continuous pipeline cavity through the pipeline.

Further, it should be understood that the housing is provided with N inner cavities, N sidewall grooves, N vertical channels, N L-shaped channels, 2N elliptical through holes and N groups of hydraulic support components, N is greater than or equal to 2, and N=3 is taken in the present invention, which is only used as an example for description, and does not constitute a limiting relationship.

Through the above-mentioned design scheme, the present invention can bring the following beneficial effects:

The invention is composed of a casing and a hydraulic support component. The hydraulic support component is installed inside the casing, and the expansion of the elastic hydraulic support is realized by controlling the high-pressure micro-pump. In close contact, the support mechanism in the well is supported by the drilling wall support mechanism and the well wall, and the high-pressure micro pump is controlled to retract the elastic hydraulic support, and the supporting mechanism in the well is separated from the well wall along with the drilling wall. The invention can realize the self-propelled self-direction-changing steerable drilling system to support the well wall when feeding is required, provide the feeding reaction force of the lower drilling tool, and at the same time have the retraction function, which does not affect the feeding of the upper drilling tool. It provides new ideas and directions for in-well or in-pipe support technology, which is very innovative and has a wide range of applications.

Description of drawings

The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to understand the present invention and do not constitute improper limitations of the present invention. In the accompanying drawings:

FIG. 1 is a 45° top view of the assembly of an in-well supporting mechanism along with the drilling wall proposed by the present invention.

FIG. 2 is a cross-sectional view of the general assembly of a well-drilling wall supporting mechanism in a well according to the present invention.

Figure 3 is a top view of the housing in the present invention.

FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3 .

FIG. 5 is a cross-sectional view taken along the line B-B in FIG. 3 .

FIG. 6 is a working schematic diagram of the hydraulic support assembly during the expansion process of the elastic hydraulic support according to the present invention, and the dashed arrows in the figure indicate the flow direction of the pressure fluid.

FIG. 7 is a working schematic diagram of the hydraulic support assembly during the contraction process of the elastic hydraulic support in the present invention, and the dashed arrows in the figure indicate the flow direction of the pressure fluid.

FIG. 8 is a working process diagram of the in-well supporting mechanism along with the drilling wall provided by the present invention to realize the supporting work in the well.

In the figure: 1-shell; 2-hydraulic support assembly; 101-vertical channel; 102-L-shaped channel; 103-oval through hole; 104-hollow channel; 105-annular groove; 106-side wall groove ; 107 - inner cavity; 201 - elastic hydraulic support; 202 - high pressure thin tube; 203 - high pressure micro pump; 204 - micro accumulator.

Detailed ways

In order to illustrate the present invention more clearly, the present invention will be further described below with reference to the preferred embodiments and accompanying drawings. It should be understood by those skilled in the art. The content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

As shown in FIG. 1 to FIG. 7 , the in-well wall supporting mechanism proposed by the present invention is composed of a casing 1 and a hydraulic support assembly 2 . The hydraulic support assembly 2 includes an elastic hydraulic support 201 and a high-pressure thin tube 202 , high pressure micro pump 203 and micro accumulator 204;

The casing 1 is a cylindrical casing with a hollow channel 104 in the middle, which is used for the corresponding mud circulation mechanism of the self-propelled self-direction steering drilling system. The upper part of the casing 1 has an annular groove 105, the space of which is used to place the high-pressure fine The tube 202 and the high-pressure micro pump 203, a plurality of inner cavities 107 are distributed circumferentially in the lower part of the casing 1, the space of which is used to place the micro-accumulator 204, and a plurality of sidewall grooves 106 are distributed circumferentially on the outer side wall of the casing 1, and the space is used for The elastic hydraulic support 201 is placed, and there is a vertical channel 101 between the annular groove 105 and the inner cavity 107, which is used to pass the lower part of the high-pressure micro-pump 203. There is an L-shaped channel between the annular groove 105 and the side wall groove 106 102, used to support the upper pipe of 201 through elastic hydraulic force, the outer diameter of the casing 1 can be set to be the same diameter as the self-propelled self-direction steering drilling system, and the whole well is installed between the components of the drilling system with the drilling wall support mechanism, Therefore, a plurality of oval through holes 103 are distributed around the hollow channel 104 for passing the cables inside the drilling tool;

The hydraulic support assembly 2 includes an elastic hydraulic support 201, a high-pressure thin tube 202, a high-pressure micropump 203 and a micro-accumulator 204. The elastic hydraulic support 201 is an elastic cylindrical cavity with a cavity inside. , the elastic cylindrical cavity is filled with pressure liquid, the elastic cylindrical cavity is fixed in the side wall groove 106 of the outer casing 1, the upper L-shaped pipe passes through the L-shaped channel 102, and the elastic hydraulic support 201 can change with the internal hydraulic force. Expansion or contraction, used to support the whole drilling system in close contact with the well wall; the high-pressure thin tube 202 is a rigid hollow thin tube, connecting the elastic hydraulic support 201 and the high-pressure micro-pump 203, and its function is to realize the elastic liquid The communication between the cavity of the force support 201 and the cavity of the high-pressure micro-pump 203 provides a medium channel for the pressure control of the high-pressure micro-pump 203 to the elastic hydraulic support 201; the high-pressure micro-pump 203 is a cylindrical micro-pump with high pressure , has the characteristics of small size, high pressure, stable operation and convenient installation, and can realize the suction and ejection functions of high-pressure liquid. The support 201 expands and draws away part of the internal hydraulic force of the elastic hydraulic support 201 to make it shrink; the micro accumulator 204 is a cylindrical micro energy storage device, fixed at the bottom of the inner cavity 107 of the housing 1, and the micro energy storage device The device 204 is communicated with the high-pressure micro-pump 203 through the high-pressure thin tube 202. In the non-working state, the high-pressure micro-pump 203 converts the energy of the system into compression energy or potential energy for storage. Supplement to ensure the stability of the overall mechanism and shaft wall support;

When installing the wall supporting mechanism in the well according to the present invention, the elastic hydraulic support 201 , the high-pressure thin tube 202 , the high-pressure micro-pump 203 and the micro-accumulator 204 are fixedly connected through the pipeline in sequence to form a continuous pipeline cavity , it should be understood that the housing is provided with N inner cavities 107, N sidewall grooves 106, N vertical channels 101, N L-shaped channels 102, 2N oval through holes 103 and N groups of hydraulic For the support assembly 2, N is greater than or equal to 2, but in the present invention, N=3 is taken, which is only used as an example for description, and does not constitute a limiting relationship.

Fig. 6 and Fig. 7 are the working schematic diagrams of the hydraulic support assembly 2 during the expansion process and the contraction process of the elastic hydraulic support 201 in the present invention, respectively, and Fig. 8 is a well-bore supporting mechanism in the well according to the present invention. The working process diagram of the work is illustrated by taking the diagram as an example, and the working principle and process of the present invention are as follows:

In the non-working state, as shown in state 1 in FIG. 8, the elastic hydraulic support 201 is in a contracted state, the outer wall of its arc surface is the same diameter as the casing 1, and the micro-accumulator 204 is in an energy-storing state, when the lower drilling tool needs During feeding, as shown in FIG. 6 , the high-pressure micro-pump 203 injects the high-pressure liquid into the elastic hydraulic support 201 through the high-pressure thin tube 202 , and the elastic hydraulic support 201 gradually expands until it is in close contact with the well wall, as shown in FIG. 8 . 2. At this time, the static friction between the elastic hydraulic support 201 and the well wall provides the reaction force for the feeding of the lower drilling tool, and at the same time, the micro accumulator 204 continuously replenishes the pressure to the high pressure micro pump 203, so that the pressure inside the elastic hydraulic support 201 is increased. After the feeding is completed, as shown in FIG. 7, the high-pressure micro-pump 203 will pump the high-pressure liquid inside the elastic hydraulic support 201 through the high-pressure thin tube 202. When the elastic hydraulic support 201 is decompressed and contracted, the whole mechanism returns to the non-working state.

Claims (4)

1. The utility model provides a wall of a well supporting mechanism is bored while drilling in well which characterized in that: the hydraulic support assembly comprises a shell (1) and a hydraulic support assembly (2), wherein the hydraulic support assembly (2) comprises an elastic hydraulic support (201), a high-pressure thin pipe (202), a high-pressure micro pump (203) and a micro accumulator (204);

the casing (1) is a cylindrical shell, a hollow channel (101) is arranged in the middle of the casing (1), an annular groove (105) is formed in the upper portion of the casing (1), a plurality of inner cavities (107) are circumferentially distributed in the lower portion of the casing (1), a plurality of side wall grooves (106) are circumferentially distributed on the outer side wall of the casing (1), a vertical channel (101) is arranged between the annular groove (105) and the inner cavities (107), an L-shaped channel (102) is arranged between the annular groove (105) and the side wall grooves (106), a plurality of oval through holes (103) are circumferentially distributed around the hollow channel (101), an elastic hydraulic support (201) is fixed in the side wall grooves (106) of the casing (1), and the high-pressure tubule (202) is a rigid hollow tubule and is used for connecting the elastic hydraulic support (; the high-pressure micropump (203) is arranged in an annular groove (105) of the shell (1); the micro energy accumulator (204) is fixed at the bottom of the inner cavity (107) of the shell (1), and the high-pressure micro pump (203) is communicated with the micro energy accumulator (204) through the high-pressure thin pipe (202) in sequence.

2. The well-drilling well wall supporting mechanism according to claim 1, wherein: the elastic hydraulic support (201) is an elastic cylindrical cavity with a cavity inside, and the cavity is filled with pressure fluid.

3. The well-drilling well wall supporting mechanism according to claim 1, wherein: the number of the upper inner cavity (107), the side wall groove (106), the vertical channel (101), the L-shaped channel (102) and the hydraulic support component (2) of the shell (1) is the same and is N, N is larger than or equal to 2, and the number of the oval through holes (103) is 2N.

4. The well-drilling well wall supporting mechanism according to claim 1, wherein: the outer diameter of the shell (1) is the same as that of the self-walking self-steering guiding drilling system.

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