Manual pressure-multiplying pressure testing cylinder

Abstract

The utility model discloses a manual pressure-multiplying pressure testing cylinder, which relates to the field of pressure detection of optical fiber petroleum corollary equipment, and comprises a pressing cylinder and a pressurizing cylinder which are coaxially connected in sequence, and the interiors of the pressing cylinder and the pressurizing cylinder are communicated; the end, close to the pressurizing cylinder, of the pressurizing cylinder is provided with a variable-diameter cylinder body short section, the variable-diameter cylinder body short section sequentially comprises a first variable-diameter section and a second variable-diameter section in the direction from the pressurizing cylinder to the pressurizing cylinder, and the inner diameter and the inner cavity area of the first variable-diameter section are both larger than the inner diameter and the inner cavity area of the second variable-diameter section. A piston rod is arranged in the pressurizing cylinder, the piston rod is matched with the inner diameter of the first reducing section, and the manual pump is used for driving the piston rod to do piston motion in the first reducing section. By adopting the scheme, through the variable-diameter barrel short section and the built-in pressurizing piston, the pressure test range of the manual pump is multiplied, the pressure resistance test of most underground tools can be covered, and the actual pressure test requirement of the underground tools is met.

Description

Technical Field

[0001] The utility model relates to the field of pressure detection of optical fiber petroleum supporting equipment, in particular to a manual pressure multiplication test cylinder. Background Art

[0002] With the improvement of the strategic position of optical fiber in oil development, the demand for optical fiber at home and abroad is increasing, and the downhole tools supporting optical fiber, such as optical cable splicing devices, sealing devices and positioning devices, are increasing year by year.

[0003] After the development of downhole tools is completed, they need to be subjected to targeted pressure tests to obtain pressure-bearing technical indicators for easy application in production projects. The bottom hole pressure of deep wells and ultra-deep wells belongs to the ultra-high pressure range, such as above 100Mpa; the maximum working pressure of manual pressure pumps on the market is generally about 70Mpa, which does not meet the pressure measurement requirements of deep well tools. Utility Model Content

[0004] The utility model aims to solve the deficiencies of the prior art and to provide a manual pressure doubling test cylinder. By adopting this solution, a short section of a variable-diameter cylinder and a pressurizing piston contained therein are used, and the movement of the piston causes the large-diameter cavity area inside the cavity to be gradually compressed toward the small-diameter cavity area, thereby doubling the pressure test range of the manual pump, which can cover most downhole tool pressure tests and meet the actual downhole tool pressure measurement needs.

[0005] The utility model is realized by the following technical solutions:

[0006] A manual pressure multiplication test cylinder, comprising:

[0007] A compression cylinder and a pressure cylinder are coaxially connected in sequence, and the compression cylinder and the pressure cylinder are internally connected; the compression cylinder has a first end cap for sealing the end of the compression cylinder at one end away from the pressure cylinder; the pressure cylinder has a second end cap for connecting to a manual pump at one end away from the compression cylinder;

[0008] The end of the pressure cylinder close to the pressure cylinder is provided with a reducing cylinder short section, and along the direction from the pressure cylinder to the pressure cylinder, the reducing cylinder short section includes a first reducing section and a second reducing section in sequence, and the inner diameter and the inner cavity area of ​​the first reducing section are both greater than the inner diameter and the inner cavity area of ​​the second reducing section;

[0009] The pressurizing cylinder is provided with a piston rod, the piston rod is adapted to the inner diameter of the first diameter-changing section, and the manual pump is used to drive the piston rod to perform piston movement in the first diameter-changing section.

[0010] Compared with the prior art, the bottom hole pressure of deep wells and ultra-deep wells belongs to the ultra-high pressure range, such as above 100Mpa; the maximum working pressure of manual pressure pumps on the market is generally about 70Mpa, which does not meet the pressure measurement needs of deep well tools. The utility model provides a manual pressure doubling pressure test cylinder. By adopting this solution, through the short section of the variable diameter cylinder and the pressurizing piston contained therein, the movement of the piston causes the large-diameter cavity area inside the cavity to be gradually compressed toward the small-diameter cavity area, thereby doubling the pressure test range of the manual pump, which can cover most downhole tool pressure tests and meet the actual downhole tool pressure measurement needs. The specific scheme includes a pressure cylinder and a pressurizing cylinder connected in sequence. The pressure cylinder is used to place the tool to be tested, one end of which is sealed by the first end cover, and the other end is connected to the pressurizing cylinder; the pressurizing cylinder is provided with a piston rod, so under the hydraulic drive of the manual pump, the piston rod can be driven to push forward in the second diameter-reducing section; after the tool to be tested is placed in the pressure cylinder, the front end space of the piston rod and the inside of the pressure cylinder are filled with liquid, the liquid fills the internal space and pushes the piston rod to the rightmost position, and then the piston rod is squeezed and pushed to the left by the hydraulic drive of the manual pump. In this process, since the inner diameter and the internal cavity area of ​​the first diameter-reducing section are both larger than the inner diameter and the internal cavity area of ​​the second diameter-reducing section, it is preferred that the cavity area of ​​the first diameter-reducing section is about twice the cavity area of ​​the second diameter-reducing section, or even more than twice. In this way, the piston rod squeezes the liquid, so that the pressure input by the hand pressure pump reaches the effect of pressure doubling after passing through the pressurizing area.

[0011] A further solution is to place one end of the pressure measuring tool carrying the optical cable in the pressure testing cylinder, and extend the other end of the optical cable out of the first end cover to connect with an external instrument. A sealing hole for the cable to pass through is opened on the center line of the first end cover.

[0012] A further solution is that, in order to achieve quick disassembly and assembly, both ends of the pressure cylinder are flanges, the first end cover and the end of the pressure cylinder are both bolted to the end of the pressure cylinder; the end of the pressure cylinder away from the pressure cylinder is a flange, and the second end cover is bolted to the end of the pressure cylinder. The flange is fixed by four bolts, and the tensile strength of the bolts must be much higher than the maximum test pressure.

[0013] In a further solution, in order to prevent the pressing cylinder from rolling randomly, the first end cover, the second end cover and the flange are all square structures.

[0014] A further solution is that, in order to achieve pressure-bearing sealing, the first end cap and the end of the pressure cylinder close to the pressure cylinder are provided with an end head for extending into the pressure cylinder; the second end cap is provided with an end head for threadedly extending into the pressure cylinder; and the three end heads are provided with double O-rings for achieving sealing. In this solution, the first end cap and the pressure cylinder are fixedly connected by a flange, and a double O-ring is arranged on the end head extending into the pressure cylinder to achieve pressure-bearing sealing; at the second end cap, it is connected with the internal thread of the pressure cylinder through its own external thread and is adapted with a double O-ring to achieve pressure-bearing sealing; in addition, double O-rings are also provided on the rod member of the piston rod and its own large diameter end. The inner surface of the pressure cylinder requires high roughness to cooperate with the piston rod seal, and the piston rod achieves sliding sealing through a double O-ring.

[0015] A further solution is to provide sufficient space for injecting hydraulic oil from the manual pump and improve the sliding stability of the piston rod, the end of the first reducing section away from the second reducing section is also connected to a third reducing section, and the inner diameter of the third reducing section is larger than the inner diameter of the first reducing section; the end of the piston rod away from the pressure cylinder has a large diameter end, and the large diameter end is adapted to the inner diameter of the third reducing section.

[0016] A further solution is to remove the air between the large diameter end of the piston rod and the end of the first reducing section to ensure that the piston can slide back and forth, and the third reducing section between the large diameter end of the piston rod and the first reducing section is provided with an air hole.

[0017] According to a further solution, in order to facilitate the injection of liquid into the pressurized cylinder, the second diameter-changing section is provided with a liquid injection hole, and the liquid injection hole is provided with a screw plug.

[0018] According to a further solution, in order to facilitate the observation of the pressure change of the pressure cylinder at any time, the second diameter-changing section is also provided with a pressure hole for connecting a pressure gauge.

[0019] A further solution is to provide an inlet channel for the hydraulic oil, and the center line of the second end cover is provided with a middle hole for the hydraulic oil to enter.

[0020] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0021] The utility model provides a manual pressure-doubling test cylinder. By adopting this solution, through the short section of the variable-diameter cylinder and the pressurizing piston contained therein, the movement of the piston causes the large-diameter cavity area inside the cavity to be gradually compressed toward the small-diameter cavity area, thereby doubling the pressure test range of the manual pump, which can cover most downhole tool pressure tests and meet the actual downhole tool pressure measurement needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 A schematic structural diagram of a manual pressure multiplication test tube according to an embodiment of the present invention;

[0024] Figure 2 The utility model provides Figure 1 AA section view.

[0025] Marks and corresponding parts names in the attached drawings:

[0026] 1-pressurizing cylinder, 2-first end cover, 3-pressurizing cylinder, 4-second end cover, 5-piston rod, 6-double O-ring, 7-air hole, 8-liquid injection hole, 9-screw plug, 10-pressure hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0028] Example:

[0029] This embodiment provides a manual pressure multiplication pressure test cylinder, such as Figure 1 and Figure 2 As shown, including:

[0030] A compression cylinder 1 and a pressure cylinder 3 are coaxially connected in sequence, and the compression cylinder 1 and the pressure cylinder 3 are internally connected; the compression cylinder 1 has a first end cap 2 for sealing the end of the compression cylinder 1 at one end away from the pressure cylinder 3; the pressure cylinder 3 has a second end cap 4 for connecting to a manual pump at one end away from the compression cylinder 1;

[0031] The end of the pressure cylinder 3 close to the pressure cylinder 1 is provided with a reducing cylinder short section. Along the direction from the pressure cylinder 3 to the pressure cylinder 1, the reducing cylinder short section includes a first reducing section and a second reducing section in sequence. The inner diameter and the inner cavity area of ​​the first reducing section are both greater than the inner diameter and the inner cavity area of ​​the second reducing section.

[0032] The pressurizing cylinder 3 has a piston rod 5 therein, and the piston rod 5 is adapted to the inner diameter of the first diameter-changing section, and the manual pump is used to drive the piston rod 5 to perform piston motion in the first diameter-changing section.

[0033] Compared with the prior art, the bottom hole pressure of deep wells and ultra-deep wells belongs to the ultra-high pressure range, such as above 100Mpa; the maximum working pressure of manual pressure pumps on the market is generally about 70Mpa, which does not meet the pressure measurement needs of deep well tools. The utility model provides a manual pressure doubling pressure test cylinder. By adopting this solution, through the short section of the variable diameter cylinder and the pressurizing piston contained therein, the movement of the piston causes the large-diameter cavity area inside the cavity to be gradually compressed toward the small-diameter cavity area, thereby doubling the pressure test range of the manual pump, which can cover most downhole tool pressure tests and meet the actual downhole tool pressure measurement needs. In the specific scheme, it includes a pressure cylinder 1 and a pressurizing cylinder 3 connected in sequence. The pressure cylinder 1 is used to place the tool to be tested. One end of the pressure cylinder 1 is sealed by the first end cover 2, and the other end is connected to the pressurizing cylinder 3; the pressurizing cylinder 3 is provided with a piston rod 5, so under the hydraulic drive of the manual pump, the piston rod 5 can be driven to push forward in the second diameter-reducing section; after the tool to be tested is placed in the pressure cylinder 1, after the front end space of the piston rod 5 and the inside of the pressure cylinder 1 are filled with liquid, the liquid fills the internal space and pushes the piston rod 5 to the rightmost position, and then the piston rod 5 is squeezed and pushed to move to the left by the hydraulic drive of the manual pump. In this process, since the inner diameter and the internal cavity area of ​​the first diameter-reducing section are both larger than the inner diameter and the internal cavity area of ​​the second diameter-reducing section, it is preferred that the cavity area of ​​the first diameter-reducing section is about twice the cavity area of ​​the second diameter-reducing section, or even more than twice. In this way, the piston rod 5 squeezes the liquid, so that the pressure input by the hand pressure pump reaches the effect of pressure doubling after passing through the pressurizing area.

[0034] In this embodiment, in order to facilitate placing one end of the pressure measuring tool carrying the optical cable in the pressure tube 1, the other end of the optical cable extends out of the first end cover 2 and is connected to an external instrument. A sealing hole for the cable to pass through is opened on the center line of the first end cover 2.

[0035] In this embodiment, in order to achieve quick disassembly and assembly, both ends of the pressure cylinder 1 are flanges, and the first end cover 2 and the ends of the pressure cylinder 3 are bolted to the ends of the pressure cylinder 1; the end of the pressure cylinder 3 away from the pressure cylinder 1 is a flange, and the second end cover 4 is bolted to the end of the pressure cylinder 3. The flange is fixed by four bolts, and the tensile strength of the bolts must be much higher than the maximum test pressure.

[0036] In this embodiment, in order to prevent the pressing cylinder 1 from rolling randomly, the first end cover 2, the second end cover 4 and the flange are all square structures.

[0037] In this embodiment, in order to achieve pressure-bearing sealing, the first end cap 2 and the pressure cylinder 3 are provided with an end for inserting into the pressure cylinder 1 on the end near the pressure cylinder 1; the second end cap 4 is provided with an end for threading into the pressure cylinder 3; and the three end caps are provided with double O-rings 6 for achieving sealing. In this scheme, the first end cap 2 and the pressure cylinder 3 are fixedly connected by a flange, and a double O-ring 6 is arranged on the end that extends into the pressure cylinder 1 to achieve pressure-bearing sealing; at the second end cap 4, it is connected to the internal thread of the pressure cylinder 1 through its own external thread, and is adapted with a double O-ring 6 to achieve pressure-bearing sealing; in addition, a double O-ring 6 is also provided on the rod member of the piston rod 5 and its own large diameter end. The inner surface of the pressure cylinder 3 requires high roughness and seals with the piston rod 5, and the piston rod 5 achieves sliding sealing through the double O-ring 6.

[0038] In this embodiment, in order to provide sufficient space for injecting the manual pump hydraulic oil and improve the sliding stability of the piston rod 5, the end of the first reducing section away from the second reducing section is also connected to a third reducing section, and the inner diameter of the third reducing section is larger than the inner diameter of the first reducing section; the end of the piston rod 5 away from the pressing cylinder 1 has a large diameter end, and the large diameter end is adapted to the inner diameter of the third reducing section.

[0039] In this embodiment, in order to remove the air between the large diameter end of the piston rod 5 and the end of the first reducing section to ensure that the piston can slide back and forth, the third reducing section between the large diameter end of the piston rod 5 and the first reducing section is provided with an air hole 7.

[0040] In this embodiment, in order to facilitate the injection of liquid into the pressurizing cylinder 3, the second diameter-changing section is provided with a liquid injection hole 8, and the liquid injection hole 8 is provided with a screw plug 9.

[0041] In this embodiment, in order to facilitate the observation of the pressure change of the pressure cylinder 1 at any time, the second diameter-changing section is also provided with a pressure hole 10 for connecting a pressure gauge.

[0042] In this embodiment, in order to provide an inlet channel for the hydraulic oil, a middle hole for the hydraulic oil to enter is provided on the center line of the second end cover 4 .

[0043] The specific working principle is as follows: first, the pressure cylinder 1 and the pressure cylinder 3 are connected by a flange, then the tool to be tested is placed in the pressure cylinder 1, the cable of the tool to be tested is passed through the central sealing hole of the first end cover 2 and connected to the external instrument, and then the first end cover 2 is sealed and connected to the end of the pressure cylinder 1 through the flange; the second end cover 4 is threaded and sealed to the end of the pressure cylinder 3, and connected to the output end of the manual pump through its own interface. After the connection is completed, the pressure cylinder 3 is filled with liquid through the injection hole 8, and the liquid pushes the piston rod 5 to move to the rightmost end. After filling, the injection hole 8 is sealed through the screw plug 9, and the manual pump is driven to start pumping in hydraulic oil, pushing the piston rod 5 to the left to squeeze the liquid. Since the inner diameter and the internal cavity area of ​​the first reducing section are both larger than the inner diameter and the internal cavity area of ​​the second reducing section, it is preferred that the cavity area of ​​the first reducing section is about twice the cavity area of ​​the second reducing section, or even more than twice. In this way, the piston rod 5 squeezes the liquid, so that the pressure input by the hand pump reaches the effect of pressure doubling after passing through the pressurization area.

[0044] The above scheme designs a manual pressure doubling test cylinder. After the manual pump is connected to the test cylinder, when the manual pump outputs F pressure, the internal pressure of the pressure cylinder cavity can directly reach at least 2F, thereby achieving the purpose of doubling the pressure. Through market research, domestic and foreign peers mainly conduct design and analysis on the pressure-increasing system, and there are no relevant patents and articles on how to use the principle of manual pressure doubling to design the pressure-increasing test cylinder. In the industry, for the pressure testing of ultra-high-pressure downhole tools, related units generally look for third-party organizations to conduct inspections due to their insufficient testing capabilities, which is time-consuming and costly. The advent of the manual pressure doubling pressure test cylinder can complete the pressure testing of downhole tools in a fast and low-cost manner. Therefore, when the working pressure of the manual pump is constant, this method can provide substantial help to realize high-pressure testing of downhole tools by changing the internal structure of the pressure cylinder and doubling the pressure, and has a very broad application prospect.

[0045] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A manual pressure multiplication test tube, characterized in that: include: A compression cylinder (1) and a pressure cylinder (3) are coaxially connected in sequence, and the compression cylinder (1) and the pressure cylinder (3) are internally connected; the compression cylinder (1) has a first end cover (2) for sealing the end of the compression cylinder (1) at one end away from the pressure cylinder (3); the pressure cylinder (3) has a second end cover (4) for connecting to a manual pump at one end away from the compression cylinder (1); The pressure cylinder (3) has a reducing cylinder short section at the end close to the pressure cylinder (1). Along the direction from the pressure cylinder (3) to the pressure cylinder (1), the reducing cylinder short section includes a first reducing section and a second reducing section in sequence. The inner diameter and the inner cavity area of ​​the first reducing section are both larger than the inner diameter and the inner cavity area of ​​the second reducing section. The pressurizing cylinder (3) is provided with a piston rod (5), the piston rod (5) is adapted to the inner diameter of the first diameter-changing section, and the manual pump is used to drive the piston rod (5) to perform piston movement in the first diameter-changing section.

2. A manual pressure multiplication test tube according to claim 1, characterized in that: A sealing hole for the cable to pass through is provided on the center line of the first end cover (2).

3. A manual pressure multiplication test tube according to claim 1, characterized in that: Both ends of the pressure cylinder (1) are flanges, and the first end cover (2) and the end of the pressure cylinder (3) are bolted to the end of the pressure cylinder (1); One end of the pressurizing cylinder (3) away from the pressure cylinder (1) is a flange, and the second end cover (4) is bolted to the end of the pressurizing cylinder (3).

4. A manual pressure multiplication test tube according to claim 3, characterized in that: The first end cover (2), the second end cover (4) and the flange are all square structures.

5. A manual pressure multiplication test tube according to claim 4, characterized in that: The first end cover (2) and the pressure cylinder (3) are provided with ends near the pressure cylinder (1) for extending into the pressure cylinder (1); The second end cover (4) has an end with a thread extending into the pressurizing cylinder (3); The three end heads are all provided with double O-rings (6) for achieving sealing.

6. A manual pressure multiplication test tube according to claim 1, characterized in that: The end of the first diameter-changing section away from the second diameter-changing section is also connected to a third diameter-changing section, and the inner diameter of the third diameter-changing section is larger than the inner diameter of the first diameter-changing section; the end of the piston rod (5) away from the pressure cylinder (1) has a large diameter end, and the large diameter end is adapted to the inner diameter of the third diameter-changing section.

7. A manual pressure multiplication test tube according to claim 6, characterized in that: The third diameter reducing section between the large diameter end of the piston rod (5) and the first diameter reducing section is provided with an air hole (7).

8. The manual pressure multiplication test tube according to claim 1, characterized in that: The second diameter-changing section is provided with a liquid injection hole (8), and the liquid injection hole (8) is provided with a screw plug (9).

9. The manual pressure multiplication test tube according to claim 1, characterized in that: The second diameter-changing section is also provided with a pressure hole (10) for connecting a pressure gauge.

10. The manual pressure multiplication test tube according to claim 1, characterized in that: The center line of the second end cover (4) is provided with a middle hole for hydraulic oil to enter.

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