CN210598954U

CN210598954U - Pressure balancing device

Info

Publication number: CN210598954U
Application number: CN201921396513.3U
Authority: CN
Inventors: 卢晓丽; 樊永涛
Original assignee: Zhengzhou Yiyuanxiang Oil Science And Technology Ltd
Current assignee: Zhengzhou Yiyuanxiang Oil Science And Technology Ltd
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2020-05-22
Anticipated expiration: 2029-08-27

Abstract

The utility model relates to a logging auxiliary assembly technical field, in particular to caliper downhole measurement's pressure balance device. The utility model provides a pressure balancing unit, includes the helmet, shell, lower clutch and cylinder, set up the electric connector in the helmet, set up the sealing member in the shell, set up the mud passageway on the shell, shell sub-unit connection mud pipe, mud pipe sub-unit connection the cylinder, in mud pipe intercommunication mud passageway and the cylinder, set up balanced piston in the cylinder, the external diameter of cylinder is less than the internal diameter of lower clutch. The cylinder barrel with the outer diameter smaller than the inner diameter of the inner joint is arranged in the lower joint of the utility model, and a cable channel is arranged between the lower joint and the cylinder barrel, thus the use is convenient; the logging device can work for a long time at high temperature and high pressure in the well, greatly reduces the production cost and improves the logging efficiency.

Description

Pressure balancing device

Technical Field

The utility model relates to a logging auxiliary assembly technical field, in particular to caliper downhole measurement's pressure balance device.

Background

The logging-while-drilling instrument usually adopts a hydraulic system as a power source to detect formation oil gas information below several kilometers, and in the whole logging process, the requirement is to ensure that the internal oil pressure is always higher than the external drilling fluid pressure, otherwise, the drilling fluid permeates into the hydraulic system to influence the normal operation of the instrument. In order to solve the problem, a corresponding base pressure self-supply device is required to be constructed for increasing the pressure in a hydraulic system of the logging instrument, and the internal oil pressure of the system can be ensured to be larger than the external drilling fluid pressure by adopting a pressure balance method.

At present, a common pressure balancing device is of a balance piston type, a leather bag type and the like, and when the leather bag type balancing device works in a high-temperature and high-pressure environment, the leather bag is easy to age, damage and lose efficacy, so that slurry flows back into an instrument, and the instrument is damaged or even scrapped. The expansion degree of the leather bag type balancing device has the maximum value, and the balance can not be adjusted when the pressure in the hydraulic oil cavity is still higher than the pressure in the slurry cavity; the balance piston type balancing device is lack of a cable channel and brings much inconvenience when in use.

Disclosure of Invention

An object of the utility model is to provide a reasonable in design, simple structure, a pressure balance device that can work for a long time in complicated environment in the pit.

The technical scheme of the utility model is that:

the utility model provides a pressure balancing unit, includes the helmet, shell, lower clutch and cylinder, set up the electric connector in the helmet, set up the sealing member in the shell, set up the mud passageway on the shell, shell sub-unit connection mud pipe, mud pipe sub-unit connection the cylinder, in mud pipe intercommunication mud passageway and the cylinder, set up balanced piston in the cylinder, the external diameter of cylinder is less than the internal diameter of lower clutch.

The lower end of the electric connector is connected with a cable, and the cable penetrates through the sealing element in a sealing mode.

The lower part of the protective cap is connected with the upper joint through internal threads, and the lower part of the upper joint is connected with the shell through internal threads.

The outer wall of the lower part of the shell is provided with an annular groove, a connecting thread sleeve is arranged in the annular groove, and the upper part of the lower joint is connected with the connecting thread sleeve through an internal thread.

The upper part of the slurry channel is obliquely arranged.

The slurry channel is provided with a filter screen

And a sealing ring is arranged between the mud pipe and the shell, and a sealing ring is arranged between the mud pipe and the cylinder barrel.

The cylinder barrel with the outer diameter smaller than the inner diameter of the inner joint is arranged in the lower joint of the utility model, and a cable channel is arranged between the lower joint and the cylinder barrel, thus the use is convenient; the downhole high-temperature high-pressure gas logging device can work for a long time at high temperature and high pressure in the well, greatly reduces the production cost, improves the logging efficiency, and has the advantages of convenience in installation, easiness in maintenance and long service life.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

1, a protective cap 2, an electric connector 3, a cable 4, an upper joint 5, a sealing member 6, a cable 7, an outer shell 8, a threaded sleeve 9, a mud pipe 11, an eccentric shell 12 and a balance piston 13 are connected with a mud channel of a lower joint 14.

Detailed Description

The utility model provides a pressure balancing unit, includes helmet 1, shell 7, lower clutch 13 and cylinder 11, sets up electric connector 2 in the helmet 1, and electric connector 2 lower extreme connecting cable 3, and 1 lower part of helmet is through female connection top connection 4, and female connection shell 7 is passed through to top connection 4 lower part.

The sealing element 5 is arranged in the shell 7, the cable 3 penetrates through the sealing element 5 in a sealing mode, the mud channel 14 is arranged on the lower portion of the shell 7, the mud channel 14 is communicated with the shell 7, the mud channel 14 is provided with a filter screen and can filter mud, particles are prevented from entering the cylinder barrel 11, the upper portion of the mud channel 14 is arranged in an inclined mode, the lower portion of the shell 7 is connected with the mud pipe 9, and a sealing ring is arranged between the mud pipe 9 and the shell 7.

An annular groove is formed in the outer wall of the lower portion of the shell 7, a connecting threaded sleeve 8 is arranged in the annular groove, the upper portion of the lower connector 13 is connected with the connecting threaded sleeve 8 through internal threads, a cylinder barrel 11 is arranged in the lower connector 13, the outer diameter of the cylinder barrel 11 is smaller than the inner diameter of the lower connector 13, a cable 3 channel is formed, the cable 3 penetrates through the balancing device and only penetrates through the sealing element 5, machining difficulty is reduced, and installation is convenient; the upper end of the cylinder barrel 11 is connected with the lower end of the mud pipe 9, a sealing ring is arranged between the mud pipe 9 and the cylinder barrel 11, and the mud pipe 9 is communicated with the mud channel 14 and the inside of the cylinder barrel 11.

The balance piston 12 is arranged in the cylinder barrel 11, the piston is well sealed and can move flexibly, the balance piston is placed underground in the using process, pressure generated underground enters the cylinder barrel 11 through the slurry channel 14, the balance piston 12 moves under the action of the pressure to keep pressure balance of the two cavities, the bearing pressure of an instrument is larger, the depth of the instrument is deeper, and the measurement of the instrument is more accurate.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims

1. The utility model provides a pressure balancing unit, its characterized in that, includes helmet (1), shell (7), lower clutch (13) and cylinder (11), set up electric connector (2) in helmet (1), set up sealing member (5) in shell (7), set up mud passageway (14) on shell (7), shell (7) sub-unit connection mud pipe (9), mud pipe (9) sub-unit connection in cylinder (11), mud pipe (9) intercommunication mud passageway (14) and cylinder (11), set up balanced piston (12) in cylinder (11), the external diameter of cylinder (11) is less than the internal diameter of lower clutch (13).

2. A pressure equalizing device according to claim 1, characterized in that the lower end of the electrical connector (2) is connected to a cable (3), the cable (3) being sealed through a seal (5).

3. A pressure equalizing device according to claim 1, characterized in that the lower part of the protective cap (1) is connected to the upper fitting (4) by means of an internal thread, and the lower part of the upper fitting (4) is connected to the housing (7) by means of an internal thread.

4. A pressure equalizing device according to claim 1, characterized in that the outer wall of the lower part of the housing (7) is provided with an annular groove, a connecting threaded sleeve (8) is arranged in the annular groove, and the upper part of the lower joint (13) is connected with the connecting threaded sleeve (8) through internal threads.

5. A pressure equalizing device according to claim 1, characterized in that the upper part of the slurry channel (14) is arranged obliquely.

6. A pressure equalizing device according to claim 1, characterized in that a sealing ring is arranged between the slurry pipe (9) and the housing (7), and a sealing ring is arranged between the slurry pipe (9) and the cylinder (11).

7. A pressure equalizing device according to claim 1, characterized in that the slurry channel (14) is provided with a filter screen.