A leak detection device for casing joint seal test

Abstract

The utility model relates to a kind of casing joint sealing test leak detection device, two air holes are drilled in symmetry on screw joint upper and lower, threaded joint is sleeved with positioning steel ring at corresponding air hole position, positioning steel ring is fixed with threaded joint by bolt, the both sides of positioning steel ring are respectively threadedly connected metal hard pipe, the end surface of metal hard pipe is aligned with the air hole of threaded joint;Titration tube is fixedly installed above fixed support, water tank is placed in the bottom of fixed support, the lower end of titration tube is inserted into water tank, the top end of titration tube is connected to syringe by hose, the bottom end of titration tube is connected to the metal hard pipe on both ends of threaded joint by hose.The utility model can realize reuse, reduce material consumption cost, use cost is low and high-temperature resistance is better, and can maintain good sealability under the test condition above 200 ℃, greatly reduce the probability of sealing failure, sealing is more reliable, and structure is simple, sensitivity and precision are high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of steel pipe processing and detection, and particularly relates to a casing joint sealing test leak detection device. BACKGROUND

[0002] Before being put into production, the oil casing threaded joint is subjected to sealing test under composite load conditions to verify whether the designed product can maintain good sealing property and structural integrity under the field working condition. Before the sealing test, the threaded joint is installed with a leak detection device, and if leakage occurs in the threaded joint during the test, the leaked gas is captured by the leak detection device and collected into a gas collection device, and finally the volume of the leaked gas is measured.

[0003] The sealing part of the conventional leak detection device is mainly a high-temperature-resistant rubber ring. Due to the material properties of rubber, the rubber ring can only be used for sealing test below 200 DEG C. With the continuous development of mining technology, the service working condition of the casing has reached as high as 350 DEG C, and the sealing evaluation test temperature also needs to reach 350 DEG C. Therefore, the conventional leak detection device cannot meet the use requirements.

[0004] To solve the technical problem that the existing leak detection device cannot be used above 200 DEG C, the utility model designs a casing joint sealing test leak detection device which can maintain good sealing property under high-temperature conditions above 200 DEG C. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects of the prior art and providing a casing joint sealing test leak detection device.

[0006] The utility model solves the technical problem by the following technical scheme:

[0007] A casing joint sealing test leak detection device, comprising a gas capturing unit and a gas measuring unit, wherein the gas capturing unit is connected with the gas measuring unit through a hose, the gas capturing unit comprises a steel pipe body, a threaded joint, a positioning steel ring and a metal hard pipe, the threaded joint and the steel pipe bodies on both sides form a test sample, two gas holes are symmetrically drilled on the threaded joint, the positioning steel ring is sleeved on the threaded joint corresponding to the position of the gas hole, the positioning steel ring is fixed with the threaded joint through bolts and the positioning steel ring and the gas hole are located in the same cross section, the metal hard pipes are threadedly connected to the two sides of the positioning steel ring, and the end face of the metal hard pipe is aligned with the gas hole of the threaded joint.

[0008] The gas measuring unit comprises a fixed support, a water tank, a burette and a syringe, the burette is fixedly installed above the fixed support, the water tank is placed at the bottom of the fixed support, the lower end of the burette is inserted into the water tank, the top end of the burette is connected to the syringe through a hose, and the bottom end of the burette is connected to the metal hard pipes at the two ends of the threaded joint through a hose.

[0009] Moreover, the end face of the metal hose is a tapered sealing end face, and the tapered sealing end face of the metal hose is in interference fit with the air hole.

[0010] Moreover, two rows of air holes are arranged side by side on the threaded joint, two positioning steel rings are arranged correspondingly on the two rows of air holes, and the four metal hard pipe end portions connected to the two positioning steel rings are respectively connected to two gas measuring units through hoses.

[0011] The advantages and beneficial effects of the utility model are as follows:

[0012] 1. The tapered sealing end face of the metal hard pipe can be reused, the material consumption cost is reduced, the use cost is low, and the high-temperature resistance is better.

[0013] 2. The positioning and gas capturing of the metal hard pipe are realized by the positioning steel ring, the structure is simple, the use is convenient, and the reliability is high.

[0014] 3. The strength of the threaded joint is high during the test process, the outer diameter changes little, the probability of sealing failure caused by the change of the outer diameter is greatly reduced, and the sealing property is more reliable.

[0015] 4. The gas measuring unit measures the gas leakage amount by means of liquid level change, can realize real-time liquid level adjustment function, and has the characteristics of simple structure, high sensitivity, high precision and convenient operation. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the utility model;

[0017] Figure 2 It is a structural schematic view of the gas capturing unit of the utility model;

[0018] Figure 3 It is a structural schematic view of the gas measuring unit of the utility model;

[0019] Figure 4 It is a structural schematic view of the metal hard pipe of the utility model.

[0020] BRIEF DESCRIPTION OF DRAWINGS

[0021] 1-threaded joint, 2-positioning steel ring, 3-bolt, 4-metal hard pipe, 5-soft pipe, 6-steel pipe body, 7-burette, 8-water tank, 9-fixing support, 10-syringe, 11-tapered sealing end face. DETAILED DESCRIPTION

[0022] The utility model makes further detailed description below through specific embodiment, the following embodiment is only descriptive, is not limitative, can not be defined the protection scope of the utility model with this.

[0023] The utility model discloses a sleeve joint sealing test leak detector, and its innovative point lies in: Figure 1 The test leak detector structure includes gas capturing unit and gas measuring unit, the gas capturing unit is connected with the gas measuring unit through the soft pipe 5, the gas capturing unit includes the steel pipe body 6, the threaded joint 1, the positioning steel ring 2 and the metal hard pipe 4, the threaded joint 1 and both sides steel pipe body 6 form test sample, the threaded joint 1 is symmetrically drilled with two gas holes, the threaded joint 1 is fitted with the positioning steel ring 2 at the position corresponding the gas hole, the positioning steel ring 2 is fixed with the threaded joint 1 through the bolt 3, and the positioning steel ring 2 is located in the same section with the gas hole, the positioning steel ring 2 is respectively threadedly connected with the metal hard pipe 4 on both sides, and the end face of the metal hard pipe 4 is aligned with the gas hole of the threaded joint 1.

[0024] The gas measuring unit includes fixing support 9, water tank 8, burette 7 and syringe 10, the fixing support 9 is fixedly installed with the burette 7 on the top, the water tank 8 is placed on the bottom of the fixing support 9, the lower end of the burette 7 is inserted into the water tank, the top end of the burette 7 is connected to the syringe 10 through the soft pipe 5, and the bottom end of the burette 7 is connected to the metal hard pipe 4 on both ends of the threaded joint 1 through the soft pipe 5.

[0025] As Figure 4 The end face of the metal soft pipe 4 is a tapered sealing end face, and the tapered sealing end face of the metal soft pipe 4 is in interference fit with the gas hole.

[0026] Two rows of gas holes are arranged on the threaded joint 1 in parallel, two positioning steel rings 2 are arranged in correspondence with the two rows of gas holes, and the end portions of the four metal hard pipes 4 connected to the two positioning steel rings 2 are respectively connected to two gas measuring units through soft pipes 5.

[0027] The working principle of the utility model is:

[0028] If a leak occurs during the test, the leaked gas is collected by the metal hard pipe 4 and transmitted to the burette 7 filled with water through the hose 5. After the gas enters the burette 7, the liquid level in the burette 7 changes. If the liquid level changes during the test, it proves that the threaded joint leaks, and the amount of change in the liquid level is the volume of the leaked gas.

[0029] The threaded joint 1 and the steel pipe body 6 form a test sample; the positioning steel ring 2 is used for fixing the metal hard pipe 4; the bolt 3 is used for fixing the positioning steel ring 2 at the leak hole position of the threaded joint 1; the metal hard pipe 4 is used for forming a seal between the gas hole on the threaded joint and the metal hard pipe 4; the hose 5 is used for transmitting the leaked gas from the metal hard pipe to the burette 7; the burette 7 is used for collecting the leaked gas and measuring the volume; the water tank 8 is used for storing a certain amount of water, and the lower end of the burette is inserted into the water, so that the water level in the burette can be kept stable; the fixing support 9 is used for fixing the burette 7; and the syringe 10 is used for adjusting the liquid level in the burette 7.

[0030] The installation steps of the device are as follows:

[0031] a) First, install the positioning steel ring 2 on the threaded joint 1, and the gas hole on the threaded joint 1 is in the same section. Screw the metal hard pipe 4 into the internal threaded hole of the positioning steel ring, continue to tighten the metal hard pipe 4 after the sealing cone surface of the metal hard pipe 4 is aligned with the gas hole of the threaded joint 1, until an interference is generated between the cone surface and the gas hole to achieve the sealing effect, and finally tighten and fix the bolt 3;

[0032] b) After connecting the metal hard pipe 4 with the hose 5, two groups of pipelines distributed at 180° of each section form a closed system, and the system is tested for sealing performance;

[0033] c) After completing the sealing performance test, fill the burette 7 with water and invert it above the water tank by using the fixing support 9, insert the lower end of the burette 7 into the water, and finally lead the hose out to the water tank 8 and insert it into the inside of the burette 7;

[0034] d) Adjust the water level to the appropriate position by using the syringe 10, and record the initial liquid level;

[0035] e) After all the installation work is completed, start the test.

[0036] The sealing structure between the leak detection device and the threaded joint is designed as a metal cone surface seal, which can maintain good sealing performance under test conditions above 200℃, and the cone-shaped sealing end surface 11 is seen in Figure 4

[0037] The structure design of the gas capturing unit integrates the position fixing and collection functions on one positioning steel ring, has the characteristics of simple structure, convenient installation and high reliability, and is seen in​Figure 2 ;

[0038] The structure of the gas collection wish is characterized by measuring the gas leakage amount by using the principle that the internal liquid level changes caused by the entering gas in the burette, and the working principle of using the syringe as the adjusting device of the internal liquid level of the burette is that the structure has the characteristics of high sensitivity, high measurement accuracy and convenient operation. Figure 3 .

[0039] Although the embodiments and drawings of the utility model are disclosed for the purpose of illustration, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit and scope of the utility model and the appended claims, therefore, the scope of the utility model is not limited to the content disclosed by the embodiments and drawings.

Claims

1. A leak detection device for use in a casing joint seal test, characterized by: The utility model provides a kind of gas measurement device, including gas capture unit and gas measurement unit, and the gas capture unit is connected with the gas measurement unit by hose (5), and the gas capture unit includes steel pipe body (6), threaded joint (1), positioning steel ring (2) and metal hard tube (4), the threaded joint (1) forms test sample with two sides steel pipe body (6), two gas holes are symmetrically drilled on the threaded joint (1) upper and lower, the threaded joint (1) is fitted with the positioning steel ring (2) on the position corresponding the gas hole, the positioning steel ring (2) is fixed with the threaded joint (1) by bolt (3) and the positioning steel ring (2) is located with the gas hole in the same section, the positioning steel ring (2) is respectively screwed with the metal hard tube (4) on both sides, and the end surface of the metal hard tube (4) is aligned with the gas hole of the threaded joint (1); The gas measurement unit includes fixed support (9), water tank (8), burette (7) and syringe (10), the fixed support (9) is fixedly installed with the burette (7) above, the water tank (8) is placed at the bottom of the fixed support (9), the lower end of the burette (7) is inserted into the water tank, the top end of the burette (7) is connected to the syringe (10) by hose (5), and the bottom end of the burette (7) is connected to the metal hard tube (4) on both ends of the threaded joint (1) by hose (5).

2. The device of claim 1, wherein: The end surface of the metal hard tube (4) is conical sealing end surface (11), and the conical sealing end surface of the metal hard tube (4) is interference fit with the gas hole.

3. The device of claim 1, wherein: Two rows of gas holes are arranged side by side on the threaded joint (1), two positioning steel rings (2) are correspondingly arranged, and the end portions of the four metal hard tubes (4) connected to the two positioning steel rings (2) are respectively connected to two gas measurement units by hose (5).

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