CN205373978U - Packing element sealing performance testing arrangement - Google Patents

Abstract

The utility model discloses a testing device for the sealing performance of a rubber cartridge, which comprises: an upper joint provided with a through hole; a test tube with one end connected with the upper joint; a lower joint connected with the other end of the test tube; The upper joint, the test tube and the lower joint form a cavity; the through hole of the upper joint penetrates into the central shaft of the cavity, and the central shaft can move axially relative to the upper joint , an annular space for filling the rubber cartridge is formed between the central shaft and the test tube; the upper joint can be against the upper end of the rubber cartridge, and the lower end of the central shaft is provided with a The stopper at the lower end of the barrel; the lower joint is used to be connected with the hydraulic testing machine, and the upper end of the central shaft is used to be connected with the hydraulic testing machine. The utility model can simulate the compression process of the rubber cartridge, realize the indoor test of the sealing ability of the rubber cartridge, and at the same time, can also carry out the pressure-bearing process test of the rubber cartridge.

Description

Rubber cartridge sealing performance test device

technical field

The utility model relates to the technical field of oil and gas exploitation, in particular to a rubber cylinder sealing performance testing device.

Background technique

At present, downhole isolation tools such as bridge plugs are used in staged fracturing of oil and gas wells, layered exploitation or snubbing operations to isolate production layers or construction target layers. The downhole isolation tool can be used to seal the tubing, and the tubing string can be tripped without snubbing and blowout. At the same time, the downhole isolation tool can also be used to perform segmented casing fracturing to improve the safety of low-permeability oil and gas wells. recovery factor. As the main downhole tool for oil exploration and development, downhole isolation tool has been widely used in various fields of oil extraction technology.

The sealing performance of the rubber cartridge in the downhole isolation tool is an important index to measure the performance of the downhole isolation tool. The existing test method for the sealing performance of the rubber cartridge is mainly to assemble the rubber cartridge with other parts of the isolation tool, and through the overall setting , Sealing and other test links for verification. The disadvantage of this test method is that the test structure is complex, the test cost is high, and it is not easy to judge the cause of leakage.

Utility model content

In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiment of the utility model is to provide a rubber cartridge sealing performance test device, which can complete the sealing of the rubber cartridge without other components of the sealing tool. Performance testing.

The concrete technical scheme of the utility model embodiment is:

A rubber cartridge sealing performance testing device, which includes: an upper joint with a through hole; a test tube connected to the upper joint at one end; a lower joint connected to the other end of the test tube; the upper joint, The test tube and the lower joint form a cavity; the central shaft of the cavity penetrates through the through hole of the upper joint, and the central shaft can move axially relative to the upper joint, and the central shaft An annular space for filling the rubber cartridge is formed between the test tube; the upper joint can abut against the upper end of the rubber cartridge, and the lower end of the central axis is provided with a stop for resisting the lower end of the rubber cartridge parts; the lower joint is used to be connected with the hydraulic testing machine, and the upper end of the central shaft is used to be connected with the hydraulic testing machine.

Preferably, a circular tube is sheathed on the central shaft, and the circular tube is located in the cavity, and is used to bear against the upper end of the rubber tube.

Preferably, an upper pull rod is connected to the upper end of the central shaft, and the upper pull rod is used for connecting with a hydraulic testing machine.

Preferably, a locking piece is sheathed on the central shaft, and the locking piece is located outside the cavity.

Preferably, the locking member includes a nut, the central shaft is provided with threads, and the nut moves on the central shaft through the threads.

Preferably, the lower joint is provided with a first opening for communicating the cavity with the outside world, and there is a gap between the side wall of the limiting member and the inner wall of the test tube.

Preferably, the lower end of the lower joint is connected with a pull-down rod, and the pull-down rod is used for connecting with a hydraulic testing machine.

Preferably, a threaded hole is opened on the lower joint, and the lower rod is connected to the lower joint through the threaded hole, and the first opening is located at the threaded hole, which communicates the cavity with the the threaded hole.

Preferably, the upper joint is threaded to the upper end of the test tube, and the lower joint is threaded to the lower end of the test tube.

Preferably, there is a gap between the outer wall of the circular tube and the inner wall of the upper joint or the inner wall of the test tube, and the upper joint is provided with a second opening for communicating the cavity with the outside world.

The technical solution of the utility model has the following significant beneficial effects:

Aiming at the rubber cartridges of downhole isolation tools such as bridge plugs, the utility model provides a rubber cartridge sealing performance test device, which can simulate the process of rubber cartridge compression and realize the indoor test of the rubber cartridge sealing ability. At the same time, the device for testing the sealing performance of the rubber cartridge can be connected with a hydraulic station, so that the pressure-bearing process test of the rubber cartridge can be carried out.

In the utility model, when the sealing performance test of the rubber cylinder needs to be performed again, the test device only needs to be reassembled to achieve the effect of repeated use, which can effectively reduce the test cost and improve the test efficiency.

Description of drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help the understanding of the present utility model, and do not specifically limit the shapes and proportional dimensions of the various components of the present utility model. Under the teaching of the utility model, those skilled in the art can choose various possible shapes and proportional dimensions according to specific conditions to implement the utility model.

Fig. 1 is a structural schematic diagram of the rubber cartridge sealing performance testing device of the present invention in the initial state of the rubber cartridge.

Fig. 2 is a schematic structural view of the rubber cartridge sealing performance testing device of the present invention in the setting state of the rubber cartridge.

Fig. 3 is a schematic diagram of pressing the lower joint of the rubber cartridge sealing performance test device of the present invention.

Fig. 4 is a schematic diagram of pressing the upper joint of the rubber cartridge sealing performance testing device of the present invention.

Reference signs of the above drawings: 1, hydraulic testing machine; 2, upper joint; 21, second opening; 3, lower joint; 31, first opening; 32, threaded hole; 4, test tube; 5, Cavity; 6. Lower rod; 7. Central axis; 71. Limiting piece; 8. Annular space; Device; 14. Hydraulic station; 15. Rubber cartridge; 16. Spacer ring.

detailed description

The details of the utility model can be understood more clearly in combination with the accompanying drawings and the description of the specific implementation of the utility model. However, the specific implementations of the utility model described here are only for the purpose of explaining the utility model, and cannot be construed as limiting the utility model in any way. Under the teaching of the present utility model, any possible deformation based on the present utility model can be conceived by a skilled person, and these should be regarded as belonging to the scope of the present utility model.

Fig. 1 is the structure schematic diagram of the rubber cartridge sealing performance testing device of the present invention in the initial state of the rubber cartridge, as shown in Fig. 1, a kind of rubber cartridge sealing performance testing device, it comprises: offer the upper connector 2 that has through hole; The test tube 4 connected with the upper joint 2; the lower joint 3 connected with the other end of the test tube 4; the upper joint 2, the test tube 4 and the lower joint 3 form a cavity 5; the through hole of the upper joint 2 penetrates into the cavity The central shaft 7 of 5, the central shaft 7 can move axially relative to the upper joint 2, and an annular space for filling the rubber tube 15 is formed between the central shaft 7 and the test tube 4; the upper joint 2 can be offset against the upper end of the rubber tube , The lower end of the central shaft 7 is provided with a stopper 71 for resisting the lower end of the rubber tube; the lower joint 3 is used for connecting with the hydraulic testing machine, and the upper end of the central shaft 7 is used for connecting with the hydraulic testing machine.

Specifically, the upper joint 2 is in the shape of a cylinder with a closed upper end, and a through hole is opened at the center of the wall surface of the upper end of the upper joint 2. The cross section of the through hole is circular, and the through hole is used for the central shaft 7 to pass through. into the upper connector 2. Threads for connecting with the test tube 4 are provided on the inner wall of the cylinder of the upper joint 2 .

The test tube 4 whose upper end is connected with the upper joint 2 has a circular cross section, and the upper end of the test tube 4 is provided with threads for connecting with the upper joint 2 . The lower end of the test tube 4 is also provided with threads, which are used to be connected with the lower joint 3 . The inside of the test tube 4 can be filled into the rubber cartridge 15, and then the performance test of the rubber cartridge 15 is performed. The body material of the test tube 4 is determined by the pressure in the test requirements, which is not limited here. For example, for the casing or oil pipe with an internal pressure capacity of 70MPa, it should be made of similar P110 grade pipes.

The lower joint 3 connected to the lower end of the test tube 4 is in the shape of a cylinder with a closed lower end, and the inner wall of the lower joint 3 cylinder is provided with threads for connecting with the test tube. A threaded hole 32 is provided on the wall surface of the closed lower end of the lower joint 3 , and the threaded hole 32 is used for connecting the lower rod 6 . When the upper joint 2, the test tube 4 and the lower joint 3 are connected, a cavity 5 is formed between the upper joint 2, the test tube 4 and the lower joint 3. When the rubber cartridge 15 is tested for performance, the cavity 5 It is used for filling into the rubber cartridge 15.

The lower end of the lower joint 3 is provided with a lower rod 6 for connecting with the hydraulic testing machine 1 , and the upper end of the lower rod 6 is provided with threads, so that the lower rod 6 can be connected with the threaded hole 32 of the lower joint 3 .

The through hole of the upper joint 2 penetrates the central shaft 7 in the cavity 5, and the central shaft 7 can move with the upper joint 2. The upper end of the central shaft 7 located outside the cavity 5 is used to connect with the hydraulic testing machine 1. The lower end of the shaft 7 located in the cavity 5 is provided with a stopper 71 for abutting against the lower end of the rubber tube 15, and the stopper 71 can be connected with the central shaft 7 through threads. An annular space 8 for filling the rubber cartridge 15 is formed between the central axis 7 and the test tube 4. When setting the performance of the rubber cartridge 15, the rubber cartridge 15 is sleeved on the central axis 7 and located in the annular space 8. The upper end of the cylinder 15 is against the inner wall of the upper joint 2, and the lower end of the rubber cylinder 15 is against the stopper 71, so that when the central shaft 7 drives the stopper 71 to move in the direction of the upper joint 2, the upper joint 2 and the stopper 71 are aligned. The rubber cartridge 15 is compressed so that the rubber cartridge 15 can be in a set state.

The operating principle of the utility model is as follows: the upper joint 2 is connected with the test tube 4, and the central axis 7 is penetrated into the upper joint 2. At this time, the rubber tube 15 to be tested is set in the test tube 4. On the central axis 7, in order to better simulate the actual working conditions of the bridge plug downhole isolation tool, two rubber sleeves 15 can be sleeved on the central axis 7, and a spacer ring 16 can be arranged between the rubber sleeves 15. One end of the shaft 7 is screwed into the limiter 71, the other end of the test tube 4 is connected to the lower joint 3, and the lower joint 3 is screwed into the lower rod 6, and the upper end of the central shaft 7 and the lower rod 6 are respectively connected to the hydraulic testing machine 1 Above, the central axis 7 is moved in the direction of the upper joint 2 by the hydraulic testing machine 1 . Fig. 2 is a structural schematic diagram of the rubber cartridge sealing performance testing device 13 of the present invention in the setting state of the rubber cartridge 15, as shown in Fig. 2 , at this time, the upper joint 2 and the stopper 71 compress the rubber cartridge 15, thereby making the The rubber cartridge 15 can be in a setting state. During the setting process of the rubber cylinder 15, the hydraulic testing machine 1 accurately records the characteristic curve between the output pressure of the hydraulic testing machine 1 (that is, equal to the setting pressure) and the compression amount of the rubber cylinder 15, and then understands the rubber cylinder through the characteristic curve 15 performance parameters.

For the rubber cartridge 15 of downhole isolation tools such as bridge plugs, the utility model provides a rubber cartridge sealing performance testing device 13, which can simulate the compression process of the rubber cartridge 15 and realize the indoor test of the sealing ability of the rubber cartridge 15. In the utility model, when the sealing performance test of the rubber cylinder 15 needs to be performed again, only the test device needs to be reassembled to achieve the effect of repeated use, which can effectively reduce the test cost and improve the test efficiency.

In a preferred embodiment, the upper end of the central shaft 7 is connected with an upper pull rod 11, and the upper pull rod 11 is used to be connected with the hydraulic testing machine 1, so that the hydraulic testing machine 1 can avoid clamping the central shaft 7 and aligning the central shaft 7. cause damage, and secondly, the diameter of the central shaft 7 needs to match the inner diameter of the test rubber tube 15, and the hydraulic testing machine 1 is not easy to directly clamp the central shaft 7 with different diameters.

In a preferred embodiment, the central shaft 7 is sleeved with a locking piece 12 , and the locking piece 12 is located outside the cavity 5 . The locking member 12 may include a nut, the central shaft 7 is provided with threads, and the nut is threaded to move on the central shaft 7 . When the rubber cartridge 15 to be tested is in the test tube 4 and is compressed by the hydraulic testing machine 1 and sealed, at this moment, the locking member 12 can be locked to the position above the upper joint 2, for example, when the locking member 12 is a nut, the nut can be rotated to the upper Connector 2, and then tighten the nut. When the rubber cartridge sealing performance testing device 13 was taken off from the hydraulic testing machine 1, the central shaft 7 was locked by the locking member 12 so that it could not move in the direction of the downward joint 3, so that the rubber cartridge 15 in the test tube 4 could be kept all the time. remain compressed.

In a preferred embodiment, a circular tube 9 is sheathed on the central shaft 7 , and the circular tube 9 is located in the cavity 5 and is used to bear against the upper end of the rubber tube 15 . When the rubber sleeve 15 is sleeved on the central axis 7, since the lengths of the rubber sleeves 15 are different, the upper and lower ends of the rubber sleeve 15 can be held against by circular tubes 9 of different lengths, which is convenient for experiments.

In a more preferred embodiment, there is a gap 10 between the outer wall of the round tube 9 and the inner wall of the upper joint 2 or the inner wall of the test tube 4 . The upper joint 2 is provided with a second opening 21 for communicating the cavity 5 with the outside world. In this way, when the test tube 4 is equipped with the test rubber tube 15, through the gap 10 and the second opening 21, one end of the rubber tube 15 can be communicated with the outside world, and then the hydraulic pressure can be injected into the test tube 4 through the second opening 21. , the hydraulic pressure can reach one end of the rubber cylinder 15 through the gap 10 . The lower joint 3 is provided with a threaded hole 32 through which the lower rod 6 is connected to the lower joint 3 . The first opening 31 is located at the threaded hole, which communicates with the cavity 5 and the threaded hole 32 . The lower joint 3 is provided with a first opening 31 for communicating the cavity 5 with the outside world, and there is a gap between the side wall of the limiting member 71 and the inner wall of the test tube 4 . After the lower rod 6 is unscrewed from the lower joint 3 , it passes through the first opening 31 , and the inside of the test tube 4 communicates with the outside world through the first opening 31 .

When the rubber cartridge sealing performance testing device 13 is removed from the hydraulic testing machine 1, the central shaft 7 is locked by the locking member 12 so that it cannot move in the direction of the downward joint 3, and the rubber cartridge 15 in the test tube 4 is kept under compression. The setting state. Now, unscrew the pull rod 6 from the lower joint 3, Fig. 3 is a schematic diagram of the sealing performance testing device 13 of the utility model rubber cartridge at the lower joint 3, as shown in Figure 3, connect the joint of the hydraulic station 14 to the lower joint 3 The upper threaded holes 32 are connected, and through the first opening 31, the pressure of the hydraulic station 14 is transmitted to the end of the test tube 4 that is close to the rubber cylinder 15 of the lower joint 3, so that the test rubber cylinder 15 is set and sealed between the central axis 7 and the Test whether the pressure bearing capacity between the test tubes 4 meets the sealing pressure requirements. If the pressure of the hydraulic station 14 does not exceed the sealing capacity of the rubber tube 15, the pressure fluid will not flow out from the second opening 21; Outflow from the opening 21, so that the sealing ability of the rubber cartridge 15 can be tested. Fig. 4 is a schematic diagram of the utility model rubber cartridge sealing performance testing device 13 pressing on the upper joint 2, as shown in Fig. 4, the joint of the hydraulic station 14 can also be connected with the second opening 21 on the upper joint 2, so , the end of the rubber tube 15 close to the upper joint 2 can be tested. If the pressure of the hydraulic station 14 does not exceed the sealing capacity of the rubber tube 15, the pressure fluid will not flow out from the first opening 31; out of the hole 31.

The rubber sleeve 15 of the bridge plug type downhole isolation tool generally has two processes in actual work, one is the compression process of the rubber sleeve 15, that is, the setting seal, and the other is the pressure bearing process of the rubber sleeve 15. Using this test device, the hydraulic pressure The testing machine 1 and the hydraulic station 14 can completely simulate the above two processes of the rubber cartridge 15 , and at the same time can obtain corresponding performance parameters of the rubber cartridge 15 through testing.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present utility model, and its purpose is to allow those familiar with this technology to understand the content of the utility model and implement it accordingly, and not to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model shall fall within the protection scope of the utility model.

Claims (10)

1. a packing element sealing property testing equipment, it is characterised in that comprising:

Offer the top connection of through hole；

The developmental tube that one end is connected with described top connection；

The lower contact being connected with the described developmental tube other end；

Described top connection, described developmental tube and described lower contact form a cavity；

Penetrate the central shaft of described cavity from the through hole of described top connection, described central shaft can be axially moveable in relatively described top connection, forms the annular space for loading packing element between described central shaft and described developmental tube；

Described top connection can offset with the upper end of described packing element, and the lower end of described central shaft is provided with the locating part for propping up described packing element lower end；

Described lower contact is for being connected with hydraulic dynamometer, and the upper end of described central shaft is for being connected with described hydraulic dynamometer.

2. packing element sealing property testing equipment according to claim 1, it is characterised in that being arranged with pipe on described central shaft, described pipe is positioned at described cavity, it is for propping up the upper end of described packing element.

3. packing element sealing property testing equipment according to claim 1, it is characterised in that the upper end of described central shaft is connected to upper connecting rod, described upper connecting rod is for being connected with hydraulic dynamometer.

4. packing element sealing property testing equipment according to claim 1, it is characterised in that being arranged with locking piece on described central shaft, described locking piece is positioned at outside described cavity.

5. packing element sealing property testing equipment according to claim 4, it is characterised in that described locking piece includes nut, described central shaft offers screw thread, and described nut passes through described screw thread to move on described central shaft.

6. packing element sealing property testing equipment according to claim 1, it is characterised in that offer in described lower contact for connecting described cavity and the first extraneous perforate, there is gap between sidewall and the inwall of described developmental tube of described locating part.

7. packing element sealing property testing equipment according to claim 6, it is characterised in that the lower end of described lower contact is connected to lower link, described lower link is for being connected with hydraulic dynamometer.

8. packing element sealing property testing equipment according to claim 7, it is characterized in that, described lower contact offers screwed hole, and described lower link is connected with described lower contact by described screwed hole, described first perforate is positioned at described screwed hole place, and it connects described cavity and described screwed hole.

9. packing element sealing property testing equipment according to claim 1, it is characterised in that described top connection is connected by screw thread with described developmental tube upper end, described lower contact is connected by screw thread with the lower end of described developmental tube.

10. packing element sealing property testing equipment according to claim 2, it is characterized in that, there is gap between the outer wall of described pipe and the inwall of described top connection or the inwall of described developmental tube, described top connection offers for connecting described cavity and the second extraneous perforate.