Oil casing joint sample pipe external pressure air-tight seal test device

Abstract

The utility model belongs to the technical field of petroleum casing pipe external pressure air-tight seal detection, and relates to a petroleum casing pipe joint sample pipe external pressure air-tight seal test device which comprises an external pressure cylinder, two annular welding end plugs, a pressure sensor and a pressurizing pipeline. The outer pressure cylinder is sleeved outside the petroleum casing joint sample pipe, the petroleum casing joint is positioned at the central position of the outer pressure cylinder, and the outer pressure cylinder is provided with two multifunctional interfaces; one ends of the two annular welding end plugs are provided with assembly bosses, the sides, provided with the assembly bosses, of the two annular welding end plugs are welded to the two ends of the outer pressing cylinder, and the other sides are welded to the two ends of the oil casing; the pressure sensor is hermetically connected with a multifunctional interface; and the pressurizing pipeline is hermetically connected with the other multifunctional interface. The device meets the requirement of an external pressure gas seal test of the petroleum casing joint, is installed in a welding mode, and is more reliable and high in test success rate compared with other assembly modes; and the annular welding end plug is not punched, so that the repeated use frequency is high.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of petroleum casing joint outer pressure gas seal detection, and relates to a petroleum casing joint sample pipe outer pressure gas seal test device. BACKGROUND

[0002] Petroleum casing is a key material for oil and gas resource exploration and development, and its construction assembly is completed through threaded connection. Generally, it is assembled by applying a certain torque through a petroleum casing with a male thread and a coupling with a female thread, and the threaded connection part (one coupling and two male ends) is called a joint. Its sealing performance is a key performance index for ensuring the safety of construction and production operations, and the objective evaluation of the joint gas sealing performance can be obtained through petroleum casing gas seal test.

[0003] The existing petroleum casing joint sealing evaluation technology can solve the problem of the test medium being either liquid or gas for the test of the joint internal pressure sealing capacity. For the test of the joint external pressure sealing capacity, the sealing combination of the external pressure kettle and the rubber ring has solved the problem of liquid sealing, but there is no mature solution for the problem of gas external pressure sealing. The petroleum casing outer pressure gas seal test device disclosed in Chinese patent application CN104295853A is provided with a pressing / test hole on the annular welded end plug, and the processing difficulty and tooling cost are high, the number of reusable devices is small, and special protection is required during welding operation to prevent the pressing / test hole from being blocked by welding spatter, which prevents the test.

[0004] Therefore, the device needs to be improved. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects of the prior art, and provides a petroleum casing joint sample pipe outer pressure gas seal test device, which improves the number of reusable devices, reduces the processing difficulty and cost, and does not require special protection during welding.

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

[0007] A petroleum casing joint sample pipe outer pressure gas seal test device, comprising: an outer pressure cylinder, two annular welded end plugs, a pressure sensor and a pressure charging pipeline; the outer pressure cylinder is sleeved outside the petroleum casing joint sample pipe, the petroleum casing joint is located at the center position of the outer pressure cylinder, and the outer pressure cylinder is provided with two multifunctional interfaces; one end of the two annular welded end plugs is provided with an assembly boss, one side of the two annular welded end plugs provided with the assembly boss is welded to the two ends of the outer pressure cylinder, and the other side is welded to the two ends of the petroleum casing; the outer pressure cylinder, the two annular welded end plugs and the petroleum casing form a closed annular area.

[0008] The pressure sensor is sealedly connected with a multifunctional interface; and the pressurizing pipeline is sealedly connected with another multifunctional interface.

[0009] Further, the two multifunctional interfaces are arranged on two sides of the outer pressure cylinder and are distributed at 180 degrees.

[0010] Further, the outer pressure cylinder is a weldable outer pressure cylinder.

[0011] Further, the multifunctional interface penetrates the whole wall thickness of the outer pressure cylinder.

[0012] Further, the two multifunctional interfaces are respectively used as a pressurizing hole and a testing hole.

[0013] Further, the exposed part of the oil casing at two ends is not less than 200 mm.

[0014] Further, a welding groove is arranged at the welding seam of the outer pressure cylinder and the annular welding end plug.

[0015] Further, the outer diameter of the annular welding end plug is the same as the outer diameter of the outer pressure cylinder, and the inner diameter is 3-5 mm larger than the outer diameter of the oil casing joint.

[0016] The advantages and positive effects of the utility model are:

[0017] (1) The utility model satisfies the requirement of the outer pressure gas seal test of the oil casing joint, and the device is installed in a welding mode, which is more reliable than other assembly modes and has a high test success rate.

[0018] (2) The annular welding end plug of the utility model is not punched, and the number of reusable times is high.

[0019] (3) The utility model sets two multifunctional interfaces of the same specification on the outer pressure cylinder, which can be switched when gas injection and pressure measurement are performed; and the multifunctional interfaces are arranged on two sides of the outer pressure cylinder and are distributed at 180 degrees, which has a small influence on the structural integrity compared with being arranged on the same side or the same section in the middle, is reasonable in layout, and is safe and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Fig. 1 is a structural schematic view of the oil casing joint sample pipe outer pressure gas seal test device of the utility model.

[0021] The reference signs are as follows: 1 - oil casing joint sample pipe, 11 - oil casing joint, 12 - oil casing; 2 - welding seam, 21 - welding slope surface; 3 - annular welding end plug, 31 - assembly boss; 4 - multifunctional interface; 5 - outer pressure cylinder; 6 - pressure sensor; 7 - pressurizing pipeline. DETAILED DESCRIPTION

[0022] The utility model will be further described in detail below through specific embodiments, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the utility model.

[0023] As shown in Figure 1 An outer pressure gas seal test device for a petroleum casing joint sample pipe 1, comprising an outer pressure cylinder 5, two annular welded end plugs 3, a pressure sensor 6 and a pressure charging pipeline 7.

[0024] The outer pressure cylinder 5 is sleeved outside the petroleum casing joint sample pipe 1, the petroleum casing joint 11 is located at the center position of the outer pressure cylinder 5, and the exposed part of the petroleum casing 12 at both ends is not less than 200 mm. The outer pressure cylinder 5 is provided with two multifunctional interfaces 4, which are arranged on both sides of the outer pressure cylinder 5 and are distributed at 180 degrees. The interface penetrates the full wall thickness of the outer pressure cylinder 5 so as to communicate the inside and outside of the outer pressure cylinder 5, and is used for injecting high-pressure gas or detecting pressure. One of the multifunctional interfaces 4 is a pressure measuring hole, which is connected with the pressure sensor 6 and is used for measuring and monitoring the pressure inside the device. The other multifunctional interface 4 is connected with the pressure charging pipeline 7 as a pressure charging hole and is used for pressing to the test pressure.

[0025] The welding seam 2 of the outer pressure cylinder 5 and the annular welded end plug 3 is provided with a welding bevel, and the welding slope surface 21 has an included angle of 60°. The outer diameter of the annular welded end plug 3 is the same as that of the outer pressure cylinder 5, and the inner diameter is 3-5 mm larger than the outer diameter of the petroleum casing joint 11. One end of the two annular welded end plugs 3 is provided with an assembly boss 31, one side of the two annular welded end plugs 3 provided with the assembly boss 31 is welded with both ends of the outer pressure cylinder 5, and the other side is welded with both ends of the petroleum casing 12. The outer pressure cylinder 5, the two annular welded end plugs 3 and the petroleum casing 12 are welded to form a closed annular area for storing and sealing the injected gas.

[0026] The use method of the utility model:

[0027] (1) Put the petroleum casing joint sample pipe 1 into the outer pressure cylinder 5, and ensure that the exposed part of the petroleum casing 12 at both ends is not less than 200 mm;

[0028] (2) Put the annular welded end plug 3 into the petroleum casing joint sample pipe 1 from both ends respectively, and assemble the positioning straight mouth into the weldable outer pressure cylinder 5 to complete the pre-assembly;

[0029] (3) Complete the welding of the annular welded end plug 3 with the petroleum casing joint 11 and the outer pressure cylinder 5 respectively, and perform about 350-degree preheating treatment before welding and heat preservation cooling after welding to complete the assembly of the outer pressure gas seal test device for the petroleum casing joint sample pipe 1;

[0030] (4) During the outer pressure gas seal test, select the multifunctional interface 4 on one side of the outer pressure cylinder 5 as the pressure charging hole connected with the pressure charging pipeline 7 for pressing to the test pressure, and select the multifunctional interface 4 on the other side as the pressure measuring hole connected with the pressure sensor 6 for measuring and monitoring the pressure inside the device.

[0031] (5) After the test is completed, the annular welded end plug 3 and the outer pressure cylinder 5 are ensured to be in good function by means of sawing and re-machining, for the next test.

[0032] The preferred embodiments of the present application are described above, it should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application.

Claims

1. An apparatus for testing the external pressure gas tightness of a casing joint sample, characterized by, The utility model relates to a kind of oil casing joint test device, including: Outer pressure cylinder (5), the outer pressure cylinder (5) is sleeved in oil casing joint sample pipe (1) outside, oil casing joint (11) is located in the central position of outer pressure cylinder (5), the outer pressure cylinder (5) is equipped with two multifunctional interfaces (4); Two annular welded end plugs (3), one end of the two annular welded end plugs (3) is equipped with assembly boss (31), one side of the two annular welded end plugs (3) equipped with assembly boss (31) is welded with outer pressure cylinder (5) two ends, the other side is welded with oil casing (12) two ends;The outer pressure cylinder (5), two annular welded end plugs (3) and oil casing (12) are welded to form annular space region after; Pressure sensor (6), the pressure sensor (6) is sealed with a multifunctional interface (4) connection; Pressure filling pipeline (7), the pressure filling pipeline (7) is sealed with another multifunctional interface (4) connection.

2. The device for testing the external pressure gas tightness of a casing joint-like pipe according to claim 1, characterized in that, Two multifunctional interfaces (4) are arranged in outer pressure cylinder (5) two sides, and are distributed in 180 degrees.

3. The device for testing the external pressure gas tightness of a petroleum casing joint-like pipe according to claim 1, characterized by The outer pressure cylinder (5) is a weldable outer pressure cylinder.

4. The device for testing the external pressure gas tightness of a petroleum casing joint-like pipe according to claim 1, characterized by Multifunctional interface (4) penetrates the whole wall thickness of outer pressure cylinder (5).

5. The device for testing the external pressure gas tightness of a petroleum casing joint-like pipe according to claim 1, characterized by Two multifunctional interfaces (4) are respectively used as pressure filling hole and test hole.

6. The device for testing the external pressure gas tightness of a petroleum casing joint-like pipe according to claim 1, characterized by The exposed part of oil casing (12) two ends is not less than 200mm.

7. The device for testing the external pressure gas tightness of a petroleum casing joint-like pipe according to claim 1, characterized by Welding seam (2) of outer pressure cylinder (5) and annular welded end plug (3) is equipped with welding bevel, and welding slope (21) angle is 60 °.

8. The device for testing the external pressure gas tightness of a petroleum casing joint-like pipe according to claim 1, characterized by The outer diameter of annular welded end plug (3) is same with the outer diameter of outer pressure cylinder (5), and the inner diameter is 3-5mm larger than the outer diameter of oil casing joint (11).

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