Hydraulic pipeline controller and multi-sliding-sleeve hydraulic control device

Abstract

A lower piston capable of axially moving is arranged in an inner hole of an upper shell, and the upper end of the lower piston is driven by an upper pressure transmission hole A; the outer wall of the lower piston is driven by a spring to move axially. A rod body of the piston rod is sequentially arranged in inner holes of the sealing pipe, the lower piston / the upper shell and the lower shell; the upper end of the piston rod is driven by the upper pressure transmission hole B. The middle section of the piston rod is provided with a limiting mechanism between the piston rod and the lower piston, and four sealed cavities are formed between the lower section of the piston rod and the inner hole of the lower shell. The lower end of the inner hole of the lower shell is closed; the lower shell is provided with a middle pressure transmission hole D communicating with the lower end of the piston rod, the upper end of the middle pressure transmission hole D communicates with the upper pressure transmission hole C, and the lower end of the lower shell is provided with four lower pressure transmission holes E communicating with the four sealing cavities correspondingly. By permutation and combination of the three hydraulic control pipelines and the three upper pressure transmission holes of the wellhead, six different combinations can be formed, independent opening and closing of the six hydraulic control sliding sleeves can be controlled, and layered mining of different oil and gas reservoirs is achieved.

Description

Technical Field

[0001] This utility model relates to oil and gas field completion tools, specifically a hydraulic pipeline controller and a multi-slip hydraulic control device. Background Technology

[0002] Currently, production sleeves are commonly used in oil and gas extraction. Hydraulically controlled sleeves, in particular, do not require wireline tools for opening and closing; only the hydraulic control lines connected to the sleeve need to be controlled. Therefore, an increasing number of oil wells are adopting hydraulically controlled sleeves. However, in actual production, an oil well typically contains multiple oil-producing layers. Each additional layer requires an additional hydraulically controlled sleeve, and two more hydraulic control lines are needed to control the opening and closing of the sleeve. The extensive use of hydraulically controlled sleeves leads to an ever-increasing number of wellhead hydraulic control lines. Currently, we need a completion tool that can control multiple hydraulically controlled sleeves without increasing the number of wellhead hydraulic control lines. Summary of the Invention

[0003] To address existing problems, this invention aims to provide a hydraulic pipeline controller and a multi-sleeve hydraulic control device that can utilize three pipelines to control the hydraulic pressure inside the tool, thereby controlling the independent switching of up to six hydraulically controlled sleeves.

[0004] To achieve the above objectives, the technical solution adopted by this utility model includes a sealing tube, an upper shell, and a lower shell connected in sequence, each with an inner hole. The upper shell has an axially movable lower piston within its inner hole, the upper end of which is driven by a pressure-up port A; the outer wall of the lower piston is driven by a spring to perform axial reset movement.

[0005] It also includes a piston rod, the piston rod body being arranged axially in the sealing tube, the lower piston / upper housing, and the inner hole of the lower housing; the upper end of the piston rod is driven by the upper pressure hole B, the middle section of the piston rod is provided with a limiting mechanism between it and the lower piston, and five sealing elements are provided between the outer wall of the lower section of the piston rod and the inner wall of the inner hole of the lower housing, forming four sealing cavities.

[0006] The lower end of the inner hole of the lower housing is closed; the upper end face of the lower housing is provided with a middle pressure transmission hole D that connects to the lower end of the piston rod. The upper end of the middle pressure transmission hole D connects to the upper pressure transmission hole C through the spring cavity and drives the piston rod to move upward. The lower end of the lower housing is provided with four lower pressure transmission holes E that connect to four sealed cavities respectively.

[0007] When opened, the upper pressure port A pressurizes and drives the lower piston downward, and the upper pressure port B pressurizes and drives the piston rod downward; the four sealed cavities move downward synchronously with the piston rod, the piston rod and the lower piston are limited, the four lower pressure transmission ports E are connected in pairs, and the sliding sleeve is opened; after the sliding sleeve is closed by pressurization, the pressure from the upper pressure port C enters the lower end of the piston rod through the middle pressure transmission port D and drives it to move upward. The piston rod resets after the limit is released.

[0008] The system includes an upper piston, the lower end of which is connected to the upper end of the piston rod. The outer wall of the upper piston forms a seal with the inner wall of the sealing tube, constituting a sealing annulus B. The upper end of the upper piston is connected to the hydraulic pressure transmission port B. The limiting mechanism includes a locking block, which is located in a through hole in the side wall of the sealing tube. The inner wall of the lower piston has a positioning deep groove and a positioning shallow groove along the axial direction from top to bottom. The outer wall of the piston rod has corresponding upper shallow groove and lower deep groove, and the two are connected along the axial direction. The locking block moves radially in the through hole, and its inner and outer sides can contact the positioning deep groove, the positioning shallow groove, and the upper shallow groove and the lower deep groove, respectively.

[0009] The upper and lower walls of the positioning deep groove, positioning shallow groove, upper shallow groove, or lower deep groove are set as inclined surfaces. The lower piston includes an upper section with a large diameter and a lower section with a small diameter, with a stepped surface between the two sections; the upper end of the spring abuts against the lower end surface of the stepped surface, and the lower end of the spring abuts against the upper end surface of the lower housing.

[0010] The upper inner wall of the lower piston forms a seal with the lower outer wall of the sealing tube, and the upper outer wall of the lower piston forms a seal with the inner wall of the upper housing, forming a sealing annulus A, which is connected to the upper pressure hole A.

[0011] Among them, the pressure transmission hole D extends axially downward from the upper end face of the lower shell and connects with the lower end of the inner hole of the lower shell; the lower end face of the stepped surface, the inner wall of the upper shell, and the upper end face of the lower shell form a sealing annular space C, through which the pressure transmission hole C connects with the pressure transmission hole D.

[0012] The sealing connection includes a threaded connection structure, as well as a Glyd ring, O-ring, or retainer ring-O-ring-retainer ring as a sealing component.

[0013] This utility model also provides a multi-sleeve hydraulic control device, including pipeline one, pipeline two, and pipeline three, and six hydraulic pipeline controllers. Pipelines one, two, and three are connected to the pressure transmission holes A, B, and C of each hydraulic pipeline controller in six different arrangements. Pipeline one is also connected to one lower pressure transmission hole E of the sliding sleeve opening group of each hydraulic pipeline controller, and the other lower pressure transmission hole E of the sliding sleeve opening group is connected to the opening port of the hydraulically controlled sliding sleeve. Pipeline three is also connected to one lower pressure transmission hole E of the sliding sleeve closing group of each hydraulic pipeline controller, and the other lower pressure transmission hole E of the sliding sleeve closing group is connected to the closing port of the hydraulically controlled sliding sleeve.

[0014] Compared with existing technologies, this invention arranges three hydraulic control lines and three pressure transmission holes at the wellhead to create six different combinations. Furthermore, utilizing the tool's unique design, each combination can be individually activated to control the opening and closing of a hydraulic control sleeve. This allows for the independent opening and closing of six hydraulic control sleeves using only three hydraulic control lines on the surface, enabling stratified exploitation of different oil and gas layers. This effectively solves the problem of excessive hydraulic control lines at the wellhead when multiple hydraulic control sleeves are installed. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0016] Figure 2 for Figure 1 A magnified view of the area within the I-frame;

[0017] Figure 2a for Figure 2 A sectional view of section JJ in the middle;

[0018] Figure 2b , 2c 2d, 2e, 2g, and 2f are respectively Figure 1 Cross-sectional views of sections BB, CC, DD, EE, FF, and GG;

[0019] Figure 3 This is a schematic diagram of the exterior of an embodiment of the present utility model;

[0020] Figure 4 This is a schematic diagram of the exterior of an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the exterior of an embodiment of the present utility model;

[0022] Figure 6 This is a schematic diagram of the pressure transmission hole E.

[0023] Figure 7 for Figure 6 A sectional view of the GG section in the middle;

[0024] Figure 8 for Figure 6 A cross-sectional view of the HH section;

[0025] In the diagram: 1. Upper connector; 2. Upper piston; 3. Sealing tube; 4. Piston rod; 5. Upper housing; 6. Clamping block; 7. Lower piston; 8. Spring; 9. Lower housing; 10. Working cylinder; 11, 12. Compression fitting assembly; 13, 14, 16, 17, 18, 19, 20, 21. Glyd rings; 15, 16, 23. O-rings; 22. Retaining ring; 26, 28. Screws; 27. Pressure plate. Detailed Implementation

[0026] The technical solutions of the present invention will be fully described below with reference to the accompanying drawings of the embodiments. For ease of description, the direction of the upper connector will be referred to as "upper" and the direction of the lower housing as "lower".

[0027] See Figures 1 to 8 , Figures 1 to 8 This illustration shows one embodiment of the present invention, which mainly includes a sealing tube, an upper shell, and a lower shell that are connected in a sealed manner from top to bottom by threads and a sealing assembly. The sealing tube and the upper shell are respectively provided with inner holes that pass through their upper and lower ends; the lower shell is also provided with an inner hole, and the lower end of the inner hole of the lower shell is closed.

[0028] See Figure 2 , Figure 2a The upper housing has a lower piston that can move axially up and down inside its inner hole. The upper end of the lower piston can be driven downward by pressure through the pressure transmission port A. The outer wall of the lower piston is connected and driven by a spring, and can move axially to return to its original position when pressure is released.

[0029] Furthermore, the upper inner wall of the lower piston and the lower outer wall of the sealing tube form a sealing structure by setting a Glyd ring, and the upper outer wall of the lower piston and the inner wall of the upper housing form a sealing structure by setting a Glyd ring, thus forming a sealing annulus A, and connecting the hydraulic pressure of the upper pressure hole A to the ferrule assembly.

[0030] As a preferred option, see Figure 2 , Figure 2a The lower piston consists of an upper section with a large diameter and a lower section with a small diameter, arranged axially. The connection between the two sections is a stepped surface. The inner cavity of the upper section of the lower piston serves as a limiting cavity to accommodate the limiting mechanism, while the cavity formed between the outer wall of the lower section of the lower piston and the inner wall of the upper housing serves as a spring cavity for the spring. The upper end of the spring abuts against the lower end face of the stepped surface, and the lower end of the spring abuts against the upper end face of the lower housing, and is in a compressed state.

[0031] See Figure 2 , Figure 2a It also includes a piston rod, the piston rod body of which is sequentially arranged axially within the sealing tube, the lower piston / upper housing, and the inner hole of the lower housing. The upper end of the piston rod is driven by the pressure transmission hole B. The middle section of the piston rod is provided with a limiting mechanism between itself and the lower piston. Five sealing elements (sealing element IV) are provided between the outer wall of the lower section of the piston rod and the inner wall of the inner hole of the lower housing, correspondingly sealing the annular space between the outer wall of the lower section of the piston rod and the inner wall of the inner hole of the lower housing into four sealing cavities (first to fourth sealing cavities). See also Figure 7 , Figure 8 The first and third sealing cavities have relatively long axial lengths, used to connect the two lower pressure transmission holes E in each group after downward movement. See also Figure 7 , Figure 8Initially, the four lower pressure transmission holes E are individually connected to the first, second, third, and fourth sealing cavities. These cavities are not interconnected because they are separated by seals II, III, and IV, respectively. Upon opening, after pressurizing the upper pressure hole A to drive the lower piston downwards, the upper pressure hole B also pressurizes to drive the piston rod downwards. The first, second, third, and fourth sealing cavities move downwards synchronously with the piston rod, creating a limiting position between the piston rod and the lower piston. During this process, seals II and IV move downwards and pass the opening of their next lower pressure transmission hole E, connecting the four lower pressure transmission holes E in pairs within the first and third sealing cavities, forming two sets of pathways. Pressurizing the upper pressure hole A at this point opens the sliding sleeve. After closing the sliding sleeve, the pressure from the upper pressure hole C enters the lower end of the piston rod through the middle pressure transmission hole D, driving it upwards. Seals II and IV move upwards, again isolating the two lower pressure transmission holes E in each group, and the piston rod resets after the limiting position is released.

[0032] Further, see Figure 2 , Figure 2a The limiting mechanism includes a locking block, which is disposed in a through hole penetrating the side wall of the sealing tube. The inner wall of the lower piston has a positioning deep groove and a positioning shallow groove (axially disconnected) arranged axially from top to bottom. The outer wall of the piston rod has corresponding upper shallow grooves and lower deep grooves. Both are arranged axially, and the lower side of the upper shallow groove and the upper side of the lower deep groove are interconnected. When the locking block is subjected to thrust, it can move axially between the two grooves. As the locking block moves radially in the through hole under the thrust of the outer wall of the piston rod and the inner wall of the lower piston, the inner and outer sides of the locking block can contact the positioning deep groove, the positioning shallow groove, and the upper shallow groove and lower deep groove, respectively, and form limiting and releasing structures as it moves.

[0033] As a preferred option, see Figure 2a The upper and lower walls of the positioning deep groove, positioning shallow groove, upper shallow groove, and lower deep groove are designed as inclined surfaces. The inclined surface structure can decompose the radial and axial forces during the axial movement of the piston rod and lower piston, thereby pushing the locking block to perform the required radial and axial movements.

[0034] As a preferred option, see Figure 2 It also includes an upper piston. The lower end of the upper piston is connected to the upper end of the piston rod. The outer wall of the upper piston forms a seal with the inner wall of the sealing tube, and together with the inner wall of the upper connector, forms a sealing annulus B; the upper end of the upper piston is connected to the hydraulic pressure through the pressure port B to connect the ferrule assembly.

[0035] See Figure 2 , Figure 2a , Figure 3-5The lower housing has a central pressure transmission hole D that connects to the lower end of the piston rod. The upper end of the central pressure transmission hole D connects to the upper pressure transmission hole C, which hydraulically drives the lower end of the piston rod to complete the upward movement. The lower end of the inner bore of the lower housing is closed. The lower end of the lower housing has four lower pressure transmission holes E that connect to four sealed cavities in its inner bore. The lower pressure transmission holes E extend axially in the side wall of the lower housing, and their lower openings are located on the lower end face of the lower housing.

[0036] Preferably, the intermediate pressure transmission hole D extends axially downward from the upper end face of the lower housing and connects with the lower end of the inner bore of the lower housing / the lower end face of the piston rod. The lower end face of the stepped surface of the lower piston, the inner wall of the upper housing, and the upper end face of the lower housing form a sealing annular cavity C (i.e., the piston cavity). The upper pressure transmission hole C connects to the intermediate pressure transmission hole D via the sealing annular cavity C. When pressurized, pressure can be transmitted along this path to the lower end face of the piston rod and drive it upward. See also... Figure 1 and Figure 2b -g, After assembling the above parts, fix them to the preset positions on the side wall of the working cylinder using pressure plates and screws. In use, designate the three wellhead pipelines as Pipeline 1, Pipeline 2, and Pipeline 3. Connect the three pipelines to the upper pressure port A, upper pressure port B, and upper pressure port C according to different serial numbers. Through permutations and combinations, six combinations can be obtained: 123; 132; 213; 231; 312; 321. See also... Figure 6-8 In addition, at the lower end of this embodiment, there are four downward pressure transmission holes E. They are divided into two groups according to their functions, with two holes in each group: the sliding sleeve opening group and the sliding sleeve closing group.

[0037] Now, let's assume we use a combination connection of 1, 2, and 3 as an example to control the opening and closing of the sliding sleeve. Specifically, in the upper part of this example, the combination connection of 1, 2, and 3 is connected to the upper pressure hole A via pipeline one, the upper pressure hole B via pipeline two, and the upper pressure hole C via pipeline three, respectively.

[0038] In the lower part of this embodiment, pipeline three is connected to one of the lower pressure transmission holes E in the sliding sleeve opening group, while the other lower pressure transmission hole E in the sliding sleeve opening group is connected to the opening port of the hydraulically controlled sliding sleeve controlled in this embodiment. Pipeline three is connected to one of the lower pressure transmission holes E in the sliding sleeve closing group, while the other lower pressure transmission hole E in the sliding sleeve closing group is connected to the closing port of the hydraulically controlled sliding sleeve controlled in this embodiment.

[0039] After connecting the pipelines, pressurize pipeline one. The hydraulic pressure from pipeline one, entering through pressure port A into sealing annular cavity A, pushes the piston downwards to its working position, aligning the positioning groove with the through hole. At this point, the piston rod does not move, and the sliding sleeve opening assembly is not connected. Then pressurize pipeline two. Liquid, passing through pressure port B, pushes the piston in sealing annular cavity B, which in turn pushes the connected piston rod downwards.

[0040] At this time, the locking block is subjected to the axial upward component force of the inclined surface on the lower side of the lower deep groove. It passes over the step in the middle of the upper shallow groove and the lower deep groove of the piston rod. From its initial position in the lower deep groove, it is pushed into the upper shallow groove by the inclined surface and moves radially outward. Its outer side enters the positioning deep groove in the inner wall of the lower piston to lock the lower piston and piston rod in the working position and form a limit to prevent the spring from resetting the lower piston after the pressure in the pipeline is released.

[0041] At this point, due to the downward movement of the first and third sealing cavities, the two lower pressure transmission holes E of the sliding sleeve opening group and sliding sleeve closing group inside the lower housing sidewall become connected. Subsequently, when pipeline one is pressurized, liquid can enter the opening port of the sliding sleeve through the now connected sliding sleeve opening group and open it. At the same time, although the sliding sleeve closing group is also connected, pipeline three is not pressurized, so it will not be affected.

[0042] When closing the sliding sleeve, both pipelines two and three must be pressurized simultaneously. Since pipeline three is directly connected to the closing port of the sliding sleeve, the liquid in pipeline three will directly enter the closing pipeline assembly to shut it off. After the sliding sleeve is closed, the pressure in pipeline two is released, and the liquid in pipeline three will enter the sealing annulus cavity C through the upper pressure transmission hole C, then travel along the middle pressure transmission hole D at the upper end of the lower housing to the lower end of the piston rod, and then push the piston rod upward to reset. At this time, the locking block is pushed by the inclined surface on the upper side of the positioning groove and falls into the lower groove of the piston rod, and retracts radially inward, so the lower piston and the sealing tube are no longer relatively fixed. Under the upward elastic force of the spring, the lower piston also completes the reset; the tool returns to its initial state.

[0043] The different depths of the positioning deep grooves and shallow grooves on the inner wall of the lower piston, and the different heights of the connected upper shallow grooves and lower deep grooves on the outer wall of the piston rod, form a specific switching mechanism. Only when the upper pressure hole A is pressed first will the spring be compressed downwards. After pressing the upper pressure hole A and then pressing the upper pressure hole B, the locking block will completely leave its initial position and extend into the positioning deep groove on the inner wall of the lower piston. Only then will the hydraulic pipeline controller enter the working state that can control the sliding sleeve switch.

[0044] If the upper pressure port B is pressurized first, the lower piston moves downwards relative to it. The locking block enters between the positioning shallow groove and the upper shallow groove on the inner wall of the lower piston, thus locking the lower piston and piston rod. Even if the upper pressure port A is pressurized later, the lower piston cannot move downwards. If the upper pressure port C is pressurized first, the liquid will only enter the cavity formed by the lower housing and the lower end of the piston rod, and will not affect the opening of the hydraulic pipeline controller. That is, except for the combination of A followed by B, other operations cannot put the tool into working state. This ensures that this embodiment will not be opened to working state when subjected to a sequence other than its own operation, and also ensures the independence of the hydraulic pipeline controller.

[0045] Similarly, as described above, using a single sequence only allows the hydraulic pipeline controller of the corresponding sequence to operate, thus achieving the purpose of controlling a single sliding sleeve with a single sequence. Furthermore, in another embodiment of this invention, the other six hydraulic pipeline controllers with different sequences are connected in series, allowing each of the six sliding sleeves to be switched on and off individually, thereby achieving layered data acquisition. Since the scheme, effect, and principle are the same as in the aforementioned embodiments, they will not be repeated here.

[0046] The embodiments of this utility model have been described above with reference to the accompanying drawings and examples. The structures given in the embodiments do not constitute a limitation on this utility model. Those skilled in the art can make adjustments as needed, and various modifications or variations within the scope of the appended claims are all within the scope of protection.

Claims

1. A hydraulic pipeline controller, characterized in that: It includes a sealing tube, an upper housing, and a lower housing connected in sequence; wherein, the inner hole of the upper housing is provided with an axially movable lower piston, the upper end of which is driven by the pressure transmission hole A; the outer wall of the lower piston is driven by a spring to move axially to return to its original position. It also includes a piston rod, the piston rod body being arranged axially in the sealing tube, the lower piston / upper housing, and the inner hole of the lower housing; the upper end of the piston rod is driven by the upper pressure hole B, the middle section of the piston rod is provided with a limiting mechanism between it and the lower piston, and four sealing cavities are formed between the outer wall of the lower section of the piston rod and the inner wall of the inner hole of the lower housing. The lower end of the inner hole of the lower housing is closed; the upper end face of the lower housing is provided with a middle pressure transmission hole D that connects to the lower end of the piston rod, the upper end of the middle pressure transmission hole D is connected to the upper pressure transmission hole C, and the lower end of the lower housing is provided with four lower pressure transmission holes E that connect to the four sealed cavities respectively.

2. The hydraulic pipeline controller according to claim 1, characterized in that: It also includes an upper piston, the lower end of which is connected to the upper end of the piston rod; the outer wall of the upper piston and the inner wall of the sealing tube form a seal, constituting a sealing annulus B; the upper end of the upper piston is connected to the hydraulic pressure transmission port B.

3. The hydraulic pipeline controller according to claim 1, characterized in that: The limiting mechanism includes a locking block, which is located in the through hole of the side wall of the sealing tube; the inner wall of the lower piston is provided with a positioning deep groove and a positioning shallow groove from top to bottom along the axial direction, and the outer wall of the piston rod is provided with a corresponding upper shallow groove and a lower deep groove, and the two are connected along the axial direction; the locking block moves radially in the through hole, and its inner and outer sides can contact the positioning deep groove, the positioning shallow groove, the upper shallow groove, and the lower deep groove, respectively.

4. The hydraulic pipeline controller according to claim 3, characterized in that: The upper and lower walls of the positioning deep groove, positioning shallow groove, upper shallow groove, or lower deep groove are set as inclined surfaces.

5. The hydraulic pipeline controller according to claim 1, characterized in that: The lower piston consists of a large-diameter upper section and a small-diameter lower section, with a stepped surface between the two sections; the upper end of the spring abuts against the lower end of the stepped surface, and the lower end of the spring abuts against the upper end of the lower housing.

6. The hydraulic pipeline controller according to claim 1 or 5, characterized in that: The upper inner wall of the lower piston forms a seal with the lower outer wall of the sealing tube, and the upper outer wall of the lower piston forms a seal with the inner wall of the upper housing, forming a sealing annulus A, and connecting to the upper pressure hole A.

7. The hydraulic pipeline controller according to claim 5, characterized in that: The pressure transmission hole D extends axially downward from the upper end face of the lower housing and connects with the lower end of the inner hole of the lower housing; the lower end face of the stepped surface, the inner wall of the upper housing, and the upper end face of the lower housing form a sealing annular space C, through which the pressure transmission hole C connects with the pressure transmission hole D.

8. The hydraulic pipeline controller according to claim 1, characterized in that: Sealing connections include threaded connection structures, as well as Glyd rings, O-rings, or retainer rings-O-rings-retainer rings as sealing components.

9. A multi-sleeve hydraulic control device, characterized in that: It includes pipeline one, pipeline two and pipeline three, and six hydraulic pipeline controllers as described in any of claims 1-8; Pipelines 1, 2, and 3 are connected to the pressure ports A, B, and C of each hydraulic pipeline controller in six different combinations. Pipeline 1 is also connected to one lower pressure transmission hole E of the sliding sleeve opening group of each hydraulic pipeline controller, and the other lower pressure transmission hole E of the sliding sleeve opening group is connected to the opening port of the hydraulic sliding sleeve. Pipeline 3 is also connected to one lower pressure transmission hole E of the sliding sleeve closing group of each hydraulic pipeline controller, and the other lower pressure transmission hole E of the sliding sleeve closing group is connected to the closing port of the hydraulic sliding sleeve.

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