Corrugated pipe type tuning fork sensor structure

Abstract

The utility model provides a corrugated pipe type tuning fork sensor structure, which comprises a sealing plug seat, a sealing plug, an oil injection plug, a corrugated pipe and a tuning fork sensor, one end of the corrugated pipe is connected with the sealing plug seat, the other end of the corrugated pipe is connected with the tuning fork sensor, and laser welding is adopted at the joint; an oil injection hole is axially formed in the sealing plug, silicone oil is injected into an inner cavity of the corrugated pipe through the oil injection hole, and an oil injection plug is used for sealing; in the well logging process, the corrugated pipe can freely move along with expansion or contraction of silicone oil in the corrugated pipe along with changes of the temperature and the pressure of well liquid, and therefore dynamic balance of the internal pressure and the external pressure of the tuning fork sensor is achieved. The utility model has the beneficial effects that: the corrugated pipe is additionally arranged and is connected with the sealing plug seat and the tuning fork sensor, and laser welding is adopted at the joint, so that no water or gas leakage is ensured, and the instrument can be used for measuring in a gas well. Silicone oil is injected into the corrugated pipe and is sealed by the oil injection plug, so that the condition that oil needs to be frequently supplemented in measurement at ordinary times is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to petroleum instrument tuning fork density meter, mainly is a bellows type tuning fork sensor structure. BACKGROUND

[0002] At present, fluid density in oilfield logging generally adopts radioactive density meter, and the density meter has harm to human body and destroys environment because of radioactive substance. With the increase of environmental protection consciousness and the protection of staff's body, more and more oilfields in China have forbidden the use of radioactive density meter, and fluid density is a very important parameter in logging.

[0003] The common tuning fork density meter in market, as shown in Figure 1 The tuning fork sensor 5 and the sealing plug 2 are installed in the shell 9, and a silicone oil cavity 7 is formed between the two, the shell 9 is provided with a liquid inlet hole 6, the liquid inlet hole 6 is vacuumized, then the silicone oil is injected and sealed with a plug. During logging, the whole device is immersed in the well fluid, and the tuning fork sensor 5 moves back and forth with the change of well fluid temperature and pressure. However, in order to ensure the flexible movement of the tuning fork sensor, the O-ring 8 installed thereon is generally made of low hardness, which will cause the gas in the well fluid to enter, thereby affecting the measurement of the instrument.

[0004] As described above, the tuning fork density meter on the market is prone to gas entry during gas well measurement, which leads to inaccurate measurement, and frequent oil supplement is required during normal measurement, which is troublesome to use. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects in the prior art and provides a bellows type tuning fork sensor structure.

[0006] The utility model aims at overcoming the defects in the prior art and provides a bellows type tuning fork sensor structure.

[0007] As a further improved technical scheme, it further comprises a shell, the sealing plug seat, the bellows and the tuning fork sensor are installed in the shell, and the shell is provided with a liquid inlet hole, so that the well fluid directly contacts the outer wall of the bellows through the liquid inlet hole.

[0008] As a further improved technical solution, the sealing plug seat and the shell are provided with an O-shaped sealing ring for sealing.

[0009] The utility model discloses beneficial effect is:

[0010] 1, the utility model adds the bellows, and the bellows is connected with the sealing plug seat and the tuning fork sensor, and is sealed with laser welding at the connecting portion, guarantees not to leak water not to leak gas, so this instrument can be in gas well measurement.

[0011] 2, the silicone oil is injected to the bellows and is sealed with the oil injection plug, and the situation of frequently supplementing oil in usual measurement is solved.

[0012] 3, the shell is provided with liquid inlet hole, so that well fluid is directly contacted with the outer wall of the bellows through the liquid inlet hole, when the change of well fluid temperature, pressure, the sensitivity of the free movement of the bellows along with the expansion or shrinkage of the silicone oil in the bellows is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the structural schematic diagram of prior art.

[0014] Figure 2 It is the schematic diagram of bellows type tuning fork sensor of the utility model.

[0015] Figure 3 It is the schematic diagram of tuning fork density instrument of the utility model with bellows type tuning fork sensor:

[0016] Mark explanation: sealing plug seat 1, sealing plug 2, oil injection plug 3, bellows 4, tuning fork sensor 5, liquid inlet hole 6, silicone oil cavity 7, O-shaped ring 8, shell 9. DETAILED DESCRIPTION

[0017] The utility model will be further described below in conjunction with the drawings and specific embodiment, it is needful to explain that under the premise of not conflicting, the following described each embodiment between or each technical feature between can be arbitrarily combined and form new embodiment.

[0018] Embodiment 1: as Figure 2As shown, a bellows type tuning fork sensor structure comprises a sealing plug seat 1, a sealing plug 2, an oil injection plug 3, a bellows 4, a tuning fork sensor 5, one end of the bellows 4 is connected with the sealing plug seat 1, the other end of the bellows 4 is connected with the tuning fork sensor 5, and laser welding is used at the connecting position to ensure no water leakage and no air leakage. The sealing plug seat 1 is provided with the sealing plug 2, the sealing plug 2 is an 8-core sealing plug, the sealing plug 2 is provided with an oil injection hole in the axial direction, silicon oil is injected into the inner cavity of the bellows 4 through the oil injection hole, so that the closed space in the bellows is filled with silicon oil, and the oil injection plug 3 is used for sealing. During the logging process, with the change of the temperature and pressure of the well fluid, the bellows 4 also freely moves with the expansion or contraction of the silicon oil in the bellows 4, so as to realize the dynamic balance of the internal and external pressures of the tuning fork sensor.

[0019] Embodiment 2: as Figure 3 As shown, the sealing plug seat 1, the bellows 4 and the tuning fork sensor 5 are installed in the shell 9, an O-shaped sealing ring for sealing is arranged between the sealing plug seat 1 and the shell 9, the liquid inlet hole 6 is formed in the shell 9, so that the well fluid directly contacts the outer wall of the bellows 4 through the liquid inlet hole 6, and when the temperature and pressure of the well fluid change, the sensitivity of the free movement of the bellows with the expansion or contraction of the silicon oil in the bellows is greatly improved.

[0020] It can be understood that equivalent replacement or change of the technical scheme and the utility model concept of the present application by those skilled in the art shall belong to the protection scope of the claims attached to the present application.

Claims

1. A bellows-type tuning fork sensor structure, characterized by: It includes sealing plug seat (1), sealing plug (2), oil injection plug (3), bellow (4), tuning fork sensor (5), one end of the bellow (4) is connected with the sealing plug seat (1), the other end of the bellow (4) is connected with the tuning fork sensor (5), and laser welding is used at the connecting place; the sealing plug seat (1) is provided with the sealing plug (2), the sealing plug (2) is provided with an oil injection hole in the axial direction, silicon oil is injected into the inner cavity of the bellow (4) through the oil injection hole, and the oil injection plug (3) is used for sealing; in the logging process, with the change of well fluid temperature and pressure, the bellow (4) also freely moves with the expansion or shrinkage of the silicon oil in the bellow (4), so that the dynamic balance of the inner and outer pressure of the tuning fork sensor is realized.

2. The bellows tuning fork sensor structure according to claim 1, characterized in that: It also includes shell (9), the sealing plug seat (1), bellow (4) and tuning fork sensor (5) are installed in the shell (9), the shell (9) is provided with liquid inlet hole (6), so that the well fluid directly contacts with the outer wall of the bellow (4) through the liquid inlet hole (6).

3. The bellows tuning fork sensor structure according to claim 2, characterized in that: O-shaped sealing ring for sealing is arranged between the sealing plug seat (1) and the shell (9).

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