Underground isotope and profile control agent throwing construction device

Abstract

The utility model discloses an underground isotope and profile control agent throwing construction device, and belongs to the technical field of oilfield water injection. An outer working barrel is sleeved outside the central pipe, an annular cavity is formed between the outer wall of the central pipe and the inner wall of the outer working barrel, and the injection hole channel penetrates through the central pipe, the annular cavity and the outer working barrel. The central slide valve is arranged in the annular cavity and is in sealing contact with the central pipe and the outer working barrel, a first pressure-bearing surface is formed at one end of the central slide valve, and a second pressure-bearing surface with the area larger than that of the first pressure-bearing surface is formed at the other end of the central slide valve; wherein pressure transmitting holes are formed in the positions, located at the two ends of the central sliding valve, of the central pipe, so that pressure is applied to the first pressure bearing face and the second pressure bearing face, and therefore the central sliding valve is unbalanced in stress and displaces to block an injection hole channel. And the economic benefit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield water injection, in particular to a downhole isotope injection and profile control agent construction device. Background Technique

[0002] After the oilfield enters the development stage, in order to maintain the formation production capacity, high-pressure water injection into the oil layer is required. Due to the differences in formation physical properties and volume deficits, the water absorption capacities of each layer also vary. If the water injection is not adjusted reasonably, it may lead to excessive water injection in some formations and insufficient water injection in other formations, affecting the overall development effect. By measuring the water absorption profile, the water absorption conditions of each water injection layer can be accurately understood, the water injection volume can be adjusted reasonably, and the water injection efficiency can be improved. The main function of injecting the profile control agent is to adjust the water absorption profile of the water injection formation and improve the oilfield development effect. The profile control agent seals the high-permeability layer and adjusts the water absorption profile of the water injection interval to make the water absorption volume more uniform, which helps to reduce the water production of the oilfield and is one of the main treatment means in the middle and late stages of oilfield development;

[0003] At present, for the ground concentric double-tube separate injection process to inject isotopes to measure the water absorption profile and the bridge-type concentric separate injection process for profile control construction, after the pipe string of the ground concentric double-tube separate injection process needs to be removed, the pipe string for injecting isotopes to measure the water absorption profile and profile control construction is lowered. After the isotope water absorption profile measurement and profile control construction are completed, the construction pipe string is removed, and the pipe string of the ground concentric double-tube separate injection process is re-lowered for water injection. In this way, the isotope water absorption profile measurement and profile control construction are realized, which increases the construction cost and has low economic benefits. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the defects existing in the prior art and provide a downhole isotope injection and profile control agent construction device for solving the problems that the ground concentric double-tube separate injection process cannot directly inject isotopes to measure the water absorption profile and inject profile control agents downhole.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The downhole isotope injection and profile control agent construction device disclosed by the utility model includes:

[0007] A central pipe with an outer working cylinder sleeved outside it, and an annular cavity is formed between the outer wall of the central pipe and the inner wall of the outer working cylinder:

[0008] And an injection hole channel penetrating through the central pipe, the annular cavity, and the outer working cylinder; it also includes

[0009] A central sliding valve installed in the annular cavity and in sealed contact with the central pipe and the outer working cylinder, with a first pressure-receiving surface formed at one end of the central sliding valve and a second pressure-receiving surface with an area larger than that of the first pressure-receiving surface formed at the other end;

[0010] Among them, pressure transmission holes are provided at both ends of the central tube located at both ends of the central slide valve, so as to apply pressure to the first pressure receiving surface and the second pressure receiving surface, so that the central slide valve is unbalanced in force and displaced to block the injection hole channel.

[0011] Furthermore, the device further includes an upper joint and a lower joint that are in sealed contact with the outer working cylinder, and the upper joint is fixedly connected to one end of the central tube, and the lower joint is fixedly connected to the other end of the central tube.

[0012] Furthermore, the pressure transmission holes include an upper pressure transmission hole and a lower pressure transmission hole;

[0013] The central tube is provided with the upper pressure transmission hole that extends obliquely towards the inner wall of the upper joint at the end corresponding to the upper joint;

[0014] The lower joint is provided with the lower pressure transmission hole that extends along its axial direction.

[0015] Furthermore, an anti-channeling groove is provided on the inner wall of the lower joint at the end of the central tube.

[0016] Furthermore, the device further includes a sealing structure, which is used to make the upper joint, the lower joint and the central slide valve in sealed contact with the outer working cylinder, and the central tube and the central slide valve in sealed contact.

[0017] Furthermore, the sealing structure includes a first sealing body, a second sealing body, and a third sealing body;

[0018] The first sealing body is installed on the outer walls of the upper joint and the lower joint through sealing grooves;

[0019] The second sealing body is installed on the outer wall of the central tube through a sealing groove;

[0020] The third sealing body is installed on both ends of the outer wall of the central slide valve through sealing grooves.

[0021] Furthermore, the length of the central slide valve is less than the length of the annular cavity, and through holes for making the injection hole channel unobstructed for liquid passing are provided on the side wall of the central slide valve.

[0022] Furthermore, a locking circlip is installed in the installation groove provided on the inner wall of the central slide valve, and clamping grooves for engaging or disengaging with the locking circlip are provided on the outer wall of the central tube at the opening and closing positions of the central slide valve.

[0023] Furthermore, the injection hole channel includes a hole inlet and a hole outlet, the central tube is provided with the hole inlet, and the outer working cylinder is provided with the hole outlet.

[0024] In the above technical solution, the downhole isotope injection and profile control agent construction device provided by the present utility model has the following beneficial effects:

[0025] The downhole isotope injection and profile control agent construction device designed by the utility model has an outer working cylinder sleeved outside the central pipe, and a central slide valve is installed in the annular cavity formed between the outer wall of the central pipe and the inner wall of the outer working cylinder. The first pressure-receiving surface of the central slide valve is smaller than the second pressure-receiving surface, and pressure transmission holes are provided at both ends of the central pipe where the central slide valve is located. Hydraulic pressure is applied to the first pressure-receiving surface and the second pressure-receiving surface through the pressure transmission holes, so that the central slide valve reciprocates in the annular control cavity, thereby realizing the opening or closing of the injection channel. The opening and closing are flexible, and a reliable sealing water injection operation is effectively realized. The device realizes the direct injection of isotopes to measure the water absorption profile and the construction of profile control agent through the concentric double-pipe separate injection process string, and has the beneficial effects of reducing construction costs and improving economic benefits. Brief Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic structural diagram of the downhole isotope injection and profile control agent construction device disclosed by the present utility model in the closed state;

[0028] Figure 2 It is a schematic structural diagram of the downhole isotope injection and profile control agent construction device disclosed by the present utility model in the open state.

[0029] Explanation of the Reference Numerals in the Drawings:

[0030] 1. Upper joint; 11. Upper pressure transmission hole;

[0031] 2. Central pipe; 21. Hole inlet; 22. Card slot;

[0032] 3. Central slide valve; 31. First pressure-receiving surface; 32. Second pressure-receiving surface; 33. Through hole;

[0033] 4. Outer working cylinder; 41. Hole outlet;

[0034] 5. Locking snap ring;

[0035] 6. Lower joint; 61. Lower pressure transmission hole; 62. Anti-channeling groove 62;

[0036] 7. Sealing groove;

[0037] 8. Annular cavity. Detailed Embodiment

[0038] To enable those skilled in the art to better understand the technical solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0039] See Figure 1 、 2 as shown;

[0040] The construction device for downhole isotope injection and profile control agent is provided, including: a central pipe 2, a central slide valve 3, and an outer working cylinder 4;

[0041] The outer working cylinder 4 is sleeved outside the central pipe 2, and an annular cavity 8 is formed between the outer wall of the central pipe 2 and the inner wall of the outer working cylinder 4. The injection hole channel capable of injecting water penetrates the central pipe 2, the annular cavity 8, and the outer working cylinder 4;

[0042] The central slide valve 3 is installed in the annular cavity 8 and is in sealed contact with the central pipe 2 and the outer working cylinder 4. One end of the central slide valve 3 forms a first pressure receiving surface 31, and the other end forms a second pressure receiving surface 32. The area of the second pressure receiving surface 32 is larger than the area of the first pressure receiving surface 31. Among them, pressure transmission holes are provided at both ends of the central pipe 2 where the central slide valve 3 is located;

[0043] In the working state, the first pressure receiving surface 31 and the second pressure receiving surface 32 are pressured by liquid. Under the action that the area of the second pressure receiving surface 32 is larger than the area of the first pressure receiving surface 31, the central slide valve 3 is out of balance in force and realizes displacement. When the central slide valve 3 blocks the injection hole channel and is in the closed state, the downhole isotope injection and profile control agent construction device is used as a normal liquid guiding pipeline (as Figure 1 shown), when the central slide valve 3 moves away from the injection hole channel and is in the open state, the downhole isotope injection and profile control agent construction device can realize isotope injection or profile control agent injection through the injection hole channel (as Figure 2 shown).

[0044] See Figure 1 :

[0045] Preferably, the device further includes an upper joint 1 and a lower joint 6 that are in sealed contact with the outer working cylinder 4:

[0046] One end of the central pipe 2 is fixedly connected to the upper joint 1, and the other end is fixedly connected to the lower joint 6. The central pipe 2 is connected to the concentric double-pipe separate injection technology pipe string through the upper joint 1 and the lower joint 6.

[0047] See Figure 1 as shown:

[0048] Preferably, the pressure transmission holes include an upper pressure transmission hole 11 and a lower pressure transmission hole 61;

[0049] The central tube 2 is provided with an upward pressure transmission hole 11 at the end corresponding to the upper joint 1, which extends obliquely towards the inner wall of the upper joint 1. By setting the upward pressure transmission hole 11 obliquely, the outlet of the upward pressure transmission hole 11 is located inside the inner wall of the upper joint 1. This can not only prevent it from being blocked when the central slide valve 3 is closed, but also ensure a certain distance between the end of the central slide valve 3 and the outlet of the upward pressure transmission hole 11, enabling the hydraulic pressure to enter the annular cavity 8 to push the central slide valve 3 to move downward against the acting force of the locking circlip 5 and the friction force between the central slide valve 3 and the central tube 2 and the working outer cylinder 4, thereby opening the injection channel;

[0050] The lower joint 6 is provided with a downward pressure transmission hole 61 extending along its axial direction, that is, the downward pressure transmission hole 61 is perpendicular to the second pressure receiving surface 32 of the central slide valve 3, facilitating the direct impact of the hydraulic pressure on the second pressure receiving surface 32, enabling the central slide valve 3 to quickly move upward against the acting force of the locking circlip 5 and the friction force between the central slide valve 3 and the central tube 2 and the working outer cylinder 4, thereby closing the injection channel. One end of the downward pressure transmission hole 61 is communicated with the annular cavity 8, and the other end is communicated with the anti-channeling groove 62 in the inner cavity of the lower joint 6.

[0051] See Figure 1 as shown in:

[0052] Preferably, an anti-channeling groove 62 is provided on the inner wall of the lower joint 6 at the end of the central tube 2. By cooperating with an external device plug (not shown), the anti-channeling groove 62 isolates the upward pressure transmission hole 11 and the downward pressure transmission hole 61 of the central tube 2. When the downward pressure transmission hole 61 is blocked, at this time, the central tube 2 can apply pressure to the central slide valve 3 through the upward pressure transmission hole 11. When the plug blocks the injection channel, the upward pressure transmission hole 11 and the downward pressure transmission hole 61 are filled with liquid at the same time, applying pressure to the first pressure receiving surface 31 and the second pressure receiving surface 32 respectively. Since the area of the first pressure receiving surface 31 is smaller than the area of the second pressure receiving surface 32, the central slide valve 3 is unbalanced in the up and down forces and performs an upward movement, thereby closing the injection channel.

[0053] See Figure 1 as shown in:

[0054] Preferably, the device further includes a sealing structure for making the upper joint 1, the lower joint 6 and the central slide valve 3 in sealed contact with the outer working cylinder 4, the central tube 2 and the central slide valve 3.

[0055] The sealing structure includes a first sealing body, a second sealing body, and a third sealing body;

[0056] The outer walls of the upper joint 1 and the lower joint 6 are both provided with a first sealing body through a sealing groove 7, and the upper joint 1 and the lower joint 6 are in sealed contact with the inner wall of the working outer tube through the first sealing body;

[0057] A second seal body is installed on the outer wall of the central pipe 2 through a sealing groove 7. Specifically, a second sealing strip is installed on the outer wall of the central pipe 2 between the upper pressure transmission hole 11 and the injection hole passage. The central pipe 2 is in sealing contact with the inner wall of the central sliding valve 3 through the second seal body;

[0058] Third seal bodies are installed on both ends of the outer wall of the central sliding valve 3 through sealing grooves 7. The third seal bodies ensure sealing contact between the outer wall of the central sliding valve 3 and the inner wall of the working outer pipe. The first seal body, the second seal body, and the third seal body are rubber sealing rings or O-ring seals in the prior art.

[0059] Preferably, the length of the central sliding valve 3 is less than the length of the annular cavity 8. A through hole 33 for the injection hole passage to pass through the liquid is provided on the side wall of the central sliding valve 3. When the central sliding valve 3 is in the open state, the through hole 33 is concentric with the injection hole passage.

[0060] See Figure 1 as shown in

[0061] Preferably, a locking circlip 5 is installed in the installation groove provided on the inner wall of the central sliding valve 3. Card slots 22 for engaging or disengaging with the locking circlip 5 are provided on the outer wall of the central pipe 2 at the open and closed positions of the central sliding valve 3. The cooperation of the card slots 22 and the locking circlip 5 is beneficial to ensuring the stability of the central sliding valve 3 when it is opened or closed.

[0062] See Figure 1 as shown in

[0063] Preferably, the injection hole passage includes a hole passage inlet 21 and a hole passage outlet 41. The central pipe 2 is provided with the hole passage inlet 21, and the outer working cylinder 4 is provided with the hole passage outlet 41. When injecting liquid, the liquid enters the annular cavity 8 through the hole passage inlet 21 and is discharged from the hole passage outlet 41.

[0064] In the above technical solution, the working principle of the downhole isotope injection and profile control agent construction device provided by the present utility model is as follows:

[0065] When the device is in the initial state downhole: under the action of downhole hydraulic pressure, the central pipe 2 receives liquid through the upper pressure transmission hole 11 and the lower pressure transmission hole 61, and the pressure acts on the first pressure receiving surface 31 and the second pressure receiving surface 32 of the central sliding valve 3. Since the area of the first pressure receiving surface 31 is smaller than the area of the second pressure receiving surface 32, the central sliding valve 3 is always subjected to an upward thrust and is in the closed state, and water can be normally injected from the central pipe 2;

[0066] When it is necessary to carry out the construction of injecting isotopes and profile control agents and the sliding valve needs to be opened, a special plug (not shown) is inserted. The plug is located in the anti-channeling groove 62 for positioning in the central tube 2, isolating the upper and lower hydraulic holes in the central tube 2, causing the lower pressure transmission hole 61 to lose pressure. At the same time, hydraulic pressure is applied to the upper part of the central tube 2. The central sliding valve 3 is pushed downward by the hydraulic pressure transmitted through the upper pressure transmission hole 11, opening the central sliding valve 3. The through hole 33 of the central sliding valve 3 corresponds to the injection hole channel, enabling unobstructed communication between the inside and outside of the concentric double-tube separate injection process string through the injection hole channel. The injection hole channel is in an open state. At this time, under the action of the locking circlip 5, the central sliding valve 3 can be in a stable open state to implement downhole isotope injection, water absorption profile measurement, or injection of profile control agents;

[0067] After the construction is completed, the injection hole channel is blocked with a plug. The upper pressure transmission hole 11 and the lower pressure transmission hole 61 in the central tube 2 are normally affected by the hydraulic pressure inside the string. The pressure-receiving area of the second pressure-receiving surface 33 of the central sliding valve 3 is larger than the area of the first pressure-receiving surface 31. The liquid entering through the lower pressure transmission hole 61 of the central sliding valve 3 pushes the central sliding valve 3 upward to close the injection hole channel.

[0068] For this downhole isotope injection and profile control agent construction device, the opening and closing actions can be repeated, and the opening and closing are flexible, effectively realizing a reliable sealed water injection operation.

[0069] Only some exemplary embodiments of the present invention have been described by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. Downhole isotope injection and profile control agent construction device, characterized in that, Comprising: A central tube (2) externally sleeved with an outer working tube (4), a ring cavity (8) being formed between the outer wall of the central tube (2) and the inner wall of the outer working tube (4): And an injection channel penetrating through the central tube (2), the ring cavity (8), and the outer working tube (4); further comprising A central slide valve (3) disposed in the ring cavity (8) and in sealing contact with the central tube (2) and the outer working tube (4), a first pressure receiving surface (31) being formed at one end of the central slide valve (3) and a second pressure receiving surface (32) with an area larger than that of the first pressure receiving surface (31) being formed at the other end; Wherein, pressure transmission holes are provided at both ends of the central tube (2) where the central slide valve (3) is located, so as to apply pressure to the first pressure receiving surface (31) and the second pressure receiving surface (32), such that the central slide valve (3) is unbalanced in force and displaced to block the injection channel.

2. The downhole isotope injection and profile control agent construction device according to claim 1, characterized in that ； The device further comprises an upper joint (1) and a lower joint (6) in sealing contact with the outer working tube (4), one end of the central tube (2) being fixedly connected to the upper joint (1) and the other end being fixedly connected to the lower joint (6).

3. The downhole isotope injection and profile control agent construction device according to claim 2, wherein; The pressure transmission holes include an upper pressure transmission hole (11) and a lower pressure transmission hole (61); The central tube (2) is provided with the upper pressure transmission hole (11) that obliquely extends towards the inner wall of the upper joint (1) at the end corresponding to the upper joint (1); The lower joint (6) is provided with the lower pressure transmission hole (61) that extends along its axial direction.

4. The downhole isotope injection and profile control agent construction device according to claim 2, wherein; An anti-channeling groove (62) is provided on the inner wall of the lower joint (6) at the end where the central tube (2) is located.

5. The downhole isotope injection and profile control agent construction device according to claim 2, characterized in that ； The device further comprises a sealing structure for making the upper joint (1), the lower joint (6), and the central slide valve (3) in sealing contact with the outer working tube (4), and the central tube (2) and the central slide valve (3).

6. The downhole isotope injection and profile control agent construction device according to claim 5, characterized in that ； The sealing structure includes a first sealing body, a second sealing body, and a third sealing body; The outer walls of the upper joint (1) and the lower joint (6) are both provided with the first sealing body through sealing grooves (7); The outer wall of the central tube (2) is provided with the second sealing body through a sealing groove (7); Both ends of the outer wall of the central slide valve (3) are provided with the third sealing body through sealing grooves (7).

7. The downhole isotope injection and profile control agent construction device according to claim 1, characterized in that ； The length of the central slide valve (3) is less than the length of the ring cavity (8), and through holes (33) for making the injection channel unobstructed for liquid passing are provided on the side wall of the central slide valve (3).

8. The downhole isotope injection and profile control agent construction device according to claim 1 or 7, characterized in that ； A locking circlip (5) is installed in the installation groove provided on the inner wall of the central slide valve (3), and clamping grooves (22) for engaging or disengaging with the locking circlip (5) are provided on the outer wall of the central tube (2) at the opening and closing positions of the central slide valve (3).

9. The downhole isotope injection and profile control agent construction device according to claim 1, Wherein; The injection channel includes a channel inlet (21) and a channel outlet (41), the central tube (2) is provided with the channel inlet (21), and the outer working tube (4) is provided with the channel outlet (41).

Images