Hydraulically-controlled underground separate production and separate injection tool

Abstract

The utility model relates to the technical field of intelligent well completion of oil and gas field development, in particular to a hydraulically-controlled underground separate production and separate injection tool which comprises an upper connector, a middle connector, a central spindle, a hydraulic control body, a liquid inlet connector and a lower connector, and a plurality of liquid inlet holes are formed in the outer wall, close to the lower connector, of the central spindle. The liquid inlet connector is provided with a plurality of liquid inlet channels used for being matched with the liquid inlet holes, the eccentric side of the hydraulic control body is provided with at least two hydraulic control channels, and the two ends of each hydraulic control channel are each provided with a stop mechanism used for preventing a connector of a hydraulic control pipeline from loosening. When the piston moves until the liquid inlet channel on the liquid inlet connector is communicated with the liquid inlet hole on the mandrel, the switch tool is in an open state, and when the piston moves until the vertical groove of the piston cylinder is not communicated with the vertical groove of the piston, the switch tool is in a closed state, so that selective recovery or injection of an oil and gas reservoir is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent well completion for oil and gas field development, in particular to a hydraulically controlled downhole separate production and injection tool. Background Art

[0002] In oil and gas well completion operations, the sliding sleeve provides a connecting channel between the tubing and the annulus for fluid circulation, stratified production or injection, and is a flow control tool.

[0003] The switch sleeves currently used are mechanical switch sleeves or hydraulic sleeves. Mechanical switch sleeves need to be opened and closed by wireline operation or continuous tubing operation. During the operation, a special tool string needs to be lowered into the pipe column for mechanical or hydraulic shock operation. Hydraulic sleeves have one-time opening or closing sleeves, which are pressurized by the pipe column to achieve a one-time action. Another type of repeated opening and closing sleeve can be opened or closed by pressurizing the oil pipe or casing, and automatically returns to its position after pressure relief. Alternatively, the opening and closing of the sleeve can be achieved by re-pressurizing by lowering a special tool.

[0004] In the multi-layer intelligent completion of electric pump production wells, due to the existence of electric pumps, the opening and closing of the sliding sleeve cannot be achieved through wireline operations or continuous tubing operations; nor can the opening and closing of the sliding sleeve be achieved by running special tools and pressurizing the tubing. At the same time, most intelligent completions are multi-layer completions, requiring multiple sliding sleeves to be used in series. At present, there is no sliding sleeve structure that can open or close different layers without wireline operations (or continuous tubing operations) and without relying on pressurization in the tubing. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a hydraulically controlled downhole production and injection tool to overcome the above-mentioned problems existing in the prior art.

[0006] Based on the above purpose, the utility model provides a hydraulically controlled downhole production and injection tool, including an upper joint, a middle joint, a core shaft, a hydraulic control body, a liquid inlet joint and a lower joint, wherein the upper joint, the middle joint, the hydraulic control body, the liquid inlet joint and the lower joint are all sleeved on the core shaft, and the upper joint, the middle joint, the hydraulic control body, the liquid inlet joint and the lower joint are sealed and fixedly connected in sequence to form a sealing cylinder, the core shaft is arranged in a piston cylinder to form a piston, a plurality of liquid inlet holes are provided on an outer wall of the core shaft near the lower joint, and a plurality of liquid inlet channels for matching the liquid inlet holes are provided on the liquid inlet joint, at least two liquid control channels are provided on the eccentric side of the hydraulic control body, and both ends of the liquid control channel are provided with a stop mechanism for preventing the joint of the hydraulic control pipeline from loosening;

[0007] Among them, when the piston moves to the point where the liquid inlet channel on the liquid inlet connector is connected to the liquid inlet hole on the core shaft, the switch tool is in an open state; when the piston moves to the point where the vertical groove of the piston cylinder is not connected to the vertical groove of the piston, the switch tool is in a closed state.

[0008] Preferably, a first limiting portion is provided inside the upper joint for the core shaft to abut against after sliding a certain distance, and a second limiting portion is provided inside the lower joint for the core shaft to abut against after sliding a certain distance. When the core shaft abuts against the first limiting portion, the liquid inlet channel on the liquid inlet joint and the liquid inlet hole on the core shaft are connected.

[0009] Preferably, bypass channels are provided on the outer walls at both ends of the hydraulic control body, each of the bypass channels is connected to the hydraulic control channel, and each of the bypass channels is fixed with at least two guard plates for preventing wear of the hydraulic control pipeline.

[0010] Preferably, a guiding slope is provided at one end of the guard plate away from the hydraulic control channel.

[0011] Preferably, a plurality of pipeline channels staggered with the liquid inlet channels are provided on the outer wall of the liquid inlet connector.

[0012] Preferably, the stopping mechanism includes a stopping bolt and two stopping washers, each of the stopping washers is provided with a polygonal through hole at one end and a waist-shaped through hole at the other end, each of the polygonal through hole is fixed at the hydraulic control channel through a joint of the hydraulic control pipeline, and each of the waist-shaped through holes overlaps with each other and is fixed to the hydraulic control body through a stopping bolt.

[0013] The beneficial effects of the utility model are as follows: different hydraulic channels of the main body are connected with hydraulic control pipelines, and the hydraulic control pipelines are connected with ground control equipment. Through the ground control equipment, liquids in different channels of the main body in different layer sections can be selectively pressurized to make the core shaft switch, thereby realizing selective recovery or injection of oil and gas layers. At the same time, a stop mechanism is designed to effectively protect the hydraulic control pipelines and avoid loosening of the hydraulic control pipeline joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the utility model;

[0016] Figure 2This is a structural schematic diagram of the hydraulic control body at the bypass channel of an embodiment of the utility model;

[0017] Figure 3 This is a cross-sectional schematic diagram of a liquid inlet connector according to an embodiment of the utility model;

[0018] Figure 4 It is a schematic structural diagram of a stop gasket according to an embodiment of the utility model.

[0019] The markings in the figure are:

[0020] 1. Upper joint; 2. Middle joint; 3. Mandrel; 4. Hydraulic control body; 5. Liquid inlet joint; 6. Lower joint; 7. Stop gasket; 8. Stop bolt; 9. Liquid inlet channel; 10. Pipeline channel; 11. Bypass channel; 12. Guard plate. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figures 1 to 4As shown, a hydraulically controlled downhole production and injection tool comprises an upper joint 1, a middle joint 2, a core shaft 3, a hydraulic control body 4, a liquid inlet joint 5 and a lower joint 6, wherein the upper joint 1, the middle joint 2, the hydraulic control body 4, the liquid inlet joint 5 and the lower joint 6 are all sleeved on the core shaft 3, and the upper joint 1, the middle joint 2, the hydraulic control body 4, the liquid inlet joint 5 and the lower joint 6 are sealed and fixedly connected in sequence to form a sealing cylinder, the core shaft 3 is arranged in a piston cylinder to form a piston, a plurality of liquid inlet holes are provided on an outer wall of the core shaft 3 near the lower joint 6, and a plurality of liquid inlet channels 9 for matching the liquid inlet holes are provided on the liquid inlet joint 5, at least two liquid control channels are provided on the eccentric side of the hydraulic control body 4, and both ends of the liquid control channel are provided with a stop mechanism for preventing the joint of the liquid control pipeline from loosening;

[0024] Among them, when the piston moves to the point where the liquid inlet channel 9 on the liquid inlet connector 5 is connected to the liquid inlet hole on the core shaft 3, the switch tool is in the open state; when the piston moves to the point where the vertical groove of the piston cylinder and the vertical groove of the piston are not connected, the switch tool is in the closed state.

[0025] For example, two hydraulic control pipelines are used to control the switch of the tool, and the tool is pressurized through the ground control equipment. The core shaft 3 is opened upward and closed downward by pressure control, thereby realizing selective recovery or injection of oil and gas layers. Multiple tools can be used at the same time, and the number of hydraulic control pipelines is N+1. At the same time, a stop mechanism is designed to effectively protect the hydraulic control pipelines to avoid loosening of the hydraulic control pipeline joints. Mechanical switch positioning mechanisms are designed on the upper and lower parts of the core shaft 3. When the switch of the hydraulic control tool fails, the matching mechanical switch tool can be lowered through the oil pipe and positioned on the positioning mechanism on the upper and lower parts of the core shaft 3, and forced opening and closing can be performed by lifting and lowering the continuous oil pipe.

[0026] As an optional embodiment, the interior of the upper joint 1 is provided with a first limiting portion for the core shaft 3 to abut against after sliding a certain distance, and the interior of the lower joint 6 is provided with a second limiting portion for the core shaft 3 to abut against after sliding a certain distance. When the core shaft 3 abuts against the first limiting portion, the liquid inlet channel 9 on the liquid inlet joint 5 and the liquid inlet hole on the core shaft 3 are connected.

[0027] As an optional embodiment, bypass channels 11 are provided on the outer walls of both ends of the hydraulic control body 4, each of the bypass channels 11 is connected to the hydraulic control channel, and each of the bypass channels 11 is fixed with at least two guard plates 12 for preventing wear of the hydraulic control pipeline.

[0028] As an optional embodiment, a guiding slope is provided at one end of the guard plate 12 away from the hydraulic control channel.

[0029] For example, the hydraulic control body 4 is designed to be eccentric, and a hydraulic control pipeline or armored cable bypass channel 11 is reserved on the eccentric side to provide a crossing channel for the lower-level tools to connect the hydraulic control pipeline; the bypass channel 11 has a guard plate 12 for protecting the hydraulic control pipeline or cable, and one end of the guard plate 12 is set as a guide slope, so that the hydraulic control pipeline or cable is in a protected state when lowering or lifting, thereby preventing the hydraulic control pipeline or cable from being worn.

[0030] As an optional embodiment, a plurality of pipeline channels 10 arranged alternately with the liquid inlet channels 9 are provided on the outer wall of the liquid inlet connector 5 .

[0031] For example, the liquid inlet channels 9 and the pipeline channels 10 distributed in the circumferential direction of the liquid inlet joint 5 are staggered, and the hydraulic control pipelines or cables do not interfere with the liquid inlet channels 9, and will not cause erosion to the hydraulic control pipelines or cables during sampling or injection.

[0032] As an optional embodiment, the stopping mechanism includes a stopping bolt 8 and two stopping gaskets 7, each of the stopping gaskets 7 is provided with a polygonal through hole at one end and a waist-shaped through hole at the other end, each of the polygonal through holes is fixed at the hydraulic control channel through a joint of the hydraulic control pipeline, and each of the waist-shaped through holes overlaps with each other and is fixed to the hydraulic control body 4 through the stopping bolt 8.

[0033] For example, the cooperation between the stop gasket 7 and the stop bolt 8 can effectively prevent the joint of the hydraulic control pipeline from loosening due to vibration, thereby preventing the joint seal of the hydraulic control pipeline from failing.

[0034] A person skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A hydraulically controlled downhole extraction and injection tool, comprising an upper joint (1), a middle joint (2), a core shaft (3), a hydraulic control body (4), a liquid inlet joint (5) and a lower joint (6), wherein the upper joint (1), the middle joint (2), the hydraulic control body (4), the liquid inlet joint (5) and the lower joint (6) are all sleeved on the core shaft (3), characterized in that: The upper joint (1), the middle joint (2), the hydraulic control body (4), the liquid inlet joint (5) and the lower joint (6) are sealed and fixedly connected in sequence to form a sealing cylinder, the core shaft (3) is arranged in the piston cylinder to form a piston, a plurality of liquid inlet holes are opened on the outer wall of the core shaft (3) close to the lower joint (6), and a plurality of liquid inlet channels (9) for matching the liquid inlet holes are opened on the liquid inlet joint (5), at least two liquid control channels are arranged on the eccentric side of the hydraulic control body (4), and both ends of the liquid control channel are provided with a stop mechanism for preventing the joint of the hydraulic control pipeline from loosening; When the piston moves to the point where the liquid inlet channel (9) on the liquid inlet connector (5) is connected to the liquid inlet hole on the core shaft (3), the switch tool is in an open state; and when the piston moves to the point where the vertical groove of the piston cylinder is not connected to the vertical groove of the piston, the switch tool is in a closed state.

2. A hydraulically controlled downhole production and injection tool according to claim 1, characterized in that: The upper joint (1) is provided with a first limiting portion inside thereof, against which the core shaft (3) abuts after sliding a certain distance, and the lower joint (6) is provided with a second limiting portion inside thereof, against which the core shaft (3) abuts after sliding a certain distance. When the core shaft (3) abuts against the first limiting portion, the liquid inlet channel (9) on the liquid inlet joint (5) is communicated with the liquid inlet hole on the core shaft (3).

3. A hydraulically controlled downhole production and injection tool according to claim 1, characterized in that: Bypass channels (11) are provided on the outer walls of both ends of the hydraulic control body (4), each of the bypass channels (11) is connected to the hydraulic control channel, and each of the bypass channels (11) is fixedly provided with at least two guard plates (12) for preventing the hydraulic control pipeline from being worn.

4. A hydraulically controlled downhole production and injection tool according to claim 3, characterized in that: A guiding slope is provided at one end of the guard plate (12) away from the hydraulic control channel.

5. A hydraulically controlled downhole production and injection tool according to claim 1, characterized in that: The outer wall of the liquid inlet joint (5) is provided with a plurality of pipeline channels (10) which are arranged in an alternating manner with the liquid inlet channels (9).

6. A hydraulically controlled downhole production and injection tool according to claim 1, characterized in that: The stop mechanism comprises a stop bolt (8) and two stop washers (7), one end of each stop washers (7) being provided with a polygonal through hole and the other end being provided with a waist-shaped through hole, each of the polygonal through holes being fixed at the hydraulic control channel via a joint of a hydraulic control pipeline, and each of the waist-shaped through holes being overlapped with each other and fixed to the hydraulic control body (4) via a stop bolt (8).

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