CN204535932U - A kind of external tubing and casing pneumatic sealing test device - Google Patents

Abstract

The utility model discloses an external oil casing gas seal detection device, which belongs to the field of oil casing collar seal detection in petroleum exploitation. The utility model comprises an outer pipe column, the upper and lower ends of the outer pipe column are respectively provided with an upper end cover and a lower end cover; the outer pipe column is provided with an upper central pipe, a valve seat and a lower central pipe, and the upper central pipe is connected to the lower central pipe through the valve seat. The side walls of the upper central tube and the lower central tube are provided with side holes; the inner side of the upper central tube is provided with an upper sliding sleeve corresponding to the side hole and can slide relatively. Telescopic upper rubber tube; the inner side of the lower central tube is provided with a sliding sleeve corresponding to its side hole and can slide relatively, and a retractable lower rubber tube is arranged between the sliding sleeve and the lower end cover. The utility model is placed outside the oil casing coupling when working, and the gas detector is used to detect the gas on the inner wall of the oil casing, and the air tightness of the oil casing is judged by detecting whether the gas leaks, which effectively solves the problem of small size oil casing gas. Seal detection problem.

Description

An external oil casing gas seal detection device

technical field

The utility model relates to the field of seal detection of oil casing couplings in oil exploitation, in particular to a threaded air tightness detection for small and medium-sized casings used in oil and gas exploration and development, in particular to an external oil casing gas seal detection device.

Background technique

With the development of exploration and development technologies such as deep wells and horizontal wells, higher requirements are put forward for drilling and completion, injection and production processes, etc. During the production process, the wellhead pressure continues to increase, and some wellhead pressures have even reached 100MPa. If the airtightness of the threaded connection of the oil and casing fails, it will cause huge economic losses and serious environmental pollution. In order to ensure the safe production of oil and gas, various oil and gas fields have higher and higher requirements for the airtightness of the oil and casing used on site.

At present, the built-in gas seal detection tool is used more often. The built-in detection tool is directly put into the oil casing for detection. If you continue to use the existing built-in detection tool principle, it will be difficult to produce a detection tool that can be placed in a small-sized oil casing. In addition, if the built-in detection tool is small in size and light in weight, it is easy to detect the tool during the detection process. Flushed out of the wellbore, causing a safety accident.

Contents of the invention

The purpose of the invention of this utility model is to provide an external oil casing gas seal detection device for the above existing problems, which is placed outside the oil casing coupling during operation and uses a gas detector to detect the gas on the inner wall of the oil casing , by detecting whether the gas leaks to judge the air tightness of the oil casing, which effectively solves the problem of small size oil casing air seal detection.

The technical scheme that the utility model adopts is as follows:

The utility model's external oil-casing air-tight detection device includes an outer pipe string, the upper and lower ends of the outer pipe string are respectively provided with an upper end cover and a lower end cover; the outer pipe string is provided with an upper central pipe, a valve seat and a The lower central tube, the upper central tube is connected to the lower central tube through the valve seat, wherein the side walls of the upper central tube and the lower central tube are provided with side holes; the inner side of the upper central tube is provided with corresponding side holes, and An upper sliding sleeve that can slide relatively, and a retractable upper rubber sleeve is arranged between the upper sliding sleeve and the upper end cover; a lower sliding sleeve corresponding to its side hole is provided on the inner side of the lower central tube, and the sliding sleeve can be relatively slid. A retractable lower rubber tube is disposed between the sliding sleeve and the lower end cover.

Due to the above structure, the upper end of the outer pipe string is connected to the upper end cover by thread, and the upper end cover is provided with a through hole, through which the detection gas can be passed into the detection device for the air tightness detection of the oil casing. Connected with a lower end cover, the lower end cover can seal the gap between the outer pipe string and the lower central pipe, so that a gas storage cavity can be formed between the outer pipe string and the upper and lower central pipes. Side holes are arranged on the outside to facilitate the flow of gas between the outer pipe string and the upper and lower center pipes into the piston cavity formed by the upper and lower sleeves. There is a gap between them. After the high-pressure gas enters, the upper sliding sleeve can only move toward the upper end cover, and the lower sliding sleeve can only move toward the lower end cover. There is an upper rubber sleeve above the upper sliding sleeve, so that the upper sliding sleeve can push the upper rubber sleeve. Make it compress and fit the outer wall of the oil casing and then set the seal. At the same time, there is a lower rubber sleeve under the sliding sleeve, so that the lower sleeve can push the lower rubber sleeve to make it compressed and fit the outer wall of the oil casing and then set the seal, so that the upper rubber sleeve and A closed space is formed between the lower rubber tubes, which is just located at the collar of the oil casing, so that the air tightness of the oil casing can be judged by detecting the gas at the collar inside the oil casing. The utility model is an external oil-casing air-tight detection device with simple structure, low cost and high detection accuracy. It provides a new detection method for more accurate judgment of the oil-casing gas sealing performance and ensures the safety in the process of oil and gas development and exploration. Since the entire device is located outside the oil-casing pipe, it is not subject to size restrictions. , so it is especially suitable for testing the airtightness of small-sized oil casings.

In the external oil casing gas seal detection device of the present utility model, the upper sliding sleeve is fitted at the position of the side hole on the inner wall of the upper central pipe, and a sealing ring is provided on the mating surface of the upper sliding sleeve and the upper central pipe, so that When air is supplied in the upper side hole of the upper central tube, the upper sliding sleeve can slide relative to the upper central tube and form a dynamic seal; A sealing ring is arranged on the mating surface of the central tube, so that when the upper side hole of the lower central tube supplies air, the sliding sleeve can slide relative to the lower central tube and form a dynamic seal.

Due to the above structure, the upper sliding sleeve can slide relative to the upper central tube and form a dynamic seal; and the lower sleeve can slide relative to the lower central tube and form a dynamic seal. When the side hole is supplied with air, the upper rubber tube is compressed to achieve the same The outer wall of the oil casing is in contact with the setting; the lower rubber tube is compressed to achieve the contact setting with the inner wall of the oil casing, and an annular sealing space is formed between the outer wall of the oil casing and the inner wall of the detection device; thus facilitating subsequent leak detection.

In the external oil casing gas seal detection device of the utility model, the valve seat is arranged with an inlet valve and an outlet valve opposite to each other; wherein the inlet valve and the outlet valve are located on the same circumference of the valve seat, and are spaced 180 from each other. Arrangement; the upper and lower ends of the valve seat are threadedly connected to the lower end of the upper central tube and the upper end of the lower central tube respectively, and sealing rings are respectively provided at the joints between the valve seat and the upper central tube, and between the valve seat and the lower central tube.

Due to the above structure, the sealing effect at each connection position can be ensured, so that the air supply and exhaust into the annular sealed space can be controlled, so as to realize the tightness detection of the oil casing and ensure the accuracy of the detection results.

In the external oil casing gas seal detection device of the present utility model, an upper protective cover 2 is provided between the upper sliding sleeve and the upper rubber barrel, and an upper protective cover 1 is arranged between the upper rubber barrel and the upper end cover; A lower protective cover 1 is provided between the lower sleeve and the lower rubber tube, and a lower protective cover 2 is provided between the lower rubber tube and the lower end cover.

Due to the above structure, the protective cover can protect the upper sliding sleeve, the upper rubber sleeve, the lower rubber sleeve and the lower sliding sleeve, so as to avoid damage when the upper rubber sleeve and the lower rubber sleeve are compressed, so that the service life is long.

In the external oil casing gas seal detection device of the utility model, the upper end cover is connected with the outer pipe string through threads, and the upper end cover is respectively sealed with the outer pipe string and the upper central pipe through the sealing ring; the upper end cover is provided with There is an air intake hole aligned with the gap between the outer pipe string and the upper central pipe, and the upper end cover is provided with a lifting ring; the lower end cover is connected to the outer pipe string through threads, and the lower end cover is respectively connected to the outer pipe string through a sealing ring. , The lower central tube is sealed.

Due to the use of the above structure, the upper end cover and the outer pipe string are connected by threads, and an O-ring is provided on the outside of the upper end cover to prevent the detection gas from leaking from the gap between the upper end cover and the outer pipe string. Type sealing ring to prevent the detection gas from leaking from the gap between the upper end cover and the upper central tube. There is an air inlet hole on the upper end cover, and the upper end of the air inlet hole is made with a pipe thread, which is connected with the gas supply device. Connection, to bear the gravity of the entire detection device, the lower end cover and the outer pipe string are connected by threads, which can seal the gap between the outer pipe string and the lower center pipe, and at the same time, there is an O-ring on the outer side of the lower end cover to prevent the detection gas from the upper end. The gap between the cover and the outer pipe string leaks, and the inner side of the upper end cover is provided with an O-ring to prevent the detection gas from leaking from the gap between the upper end cover and the upper central tube.

In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

1. The external oil casing gas seal detection device of the utility model is placed outside the oil casing coupling when working, and the gas detector is used to detect the gas on the inner wall of the oil casing, and the oil casing gas is judged by detecting whether the gas leaks. Tightness, which effectively solves the problem of small-sized oil casing gas seal detection.

2. The external oil casing gas seal detection device of the utility model has the advantages of simple structure, light weight, low cost, and convenient transportation. Tube;

3. The external oil and casing gas seal detection device of the utility model provides a new detection method for more accurately judging the gas seal performance of the oil and casing, and ensures the safety in the process of oil and gas development and exploration. Since the whole device is located in the oil casing The outside of the tube is not limited in size, so it is especially suitable for testing the airtightness of small-sized oil casings.

Description of drawings

The utility model will be explained by way of example and with reference to the accompanying drawings, wherein:

Fig. 1 is the schematic diagram of the utility model in non-working state;

Fig. 2 is a schematic diagram of the utility model in pressurized working state;

Fig. 3 is the schematic diagram of the utility model in the pressure relief state;

In the figure: 1-lifting ring 1, 2-air intake hole, 3-outer O-ring of upper end cover, 4-upper central tube, 5-outer pipe column, 6-upper sliding sleeve O-ring 1, 7-upper Center pipe side hole 1, 8-upper sliding sleeve O-ring 3, 9-valve seat, 10-intake valve, 11-valve seat O-ring 2, 12-lower central pipe, 13-sliding sleeve O-ring Sealing ring 1, 14-side hole 1 of the lower central tube, 15-sliding sleeve O-shaped sealing ring 3, 16-outer O-ring of the lower end cover, 17-lower end cover, 18-lower protective sleeve 2, 19-inside the lower end cover O-ring, 20-lower rubber tube, 21-lower protective sleeve 1, 22-sliding sleeve O-ring 4, 23-sliding sleeve O-ring 2, 24-lower central tube side hole 2, 25-sliding Sleeve, 26-air outlet valve, 27-valve seat O-ring 1, 28-coupling, 29-upper sliding sleeve O-ring 4, 30-upper center tube side hole 2, 31-upper sliding sleeve, 32- Upper sliding sleeve O-shaped sealing ring two, 33-upper protective cover two, 34-upper rubber barrel, 35-upper protective cover one, 36-inner O-ring of upper end cover, 37-upper end cover, 38-hanging ring 2.

Detailed ways

All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and/or steps.

Any feature disclosed in this specification (including any appended claims, abstract), unless otherwise stated, may be replaced by alternative features that are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

As shown in Figures 1 to 3, the external oil casing gas seal detection device of the present invention includes an outer pipe string 5, and the upper and lower ends of the outer pipe string 5 are respectively provided with an upper end cover 37 and a lower end cover 17; The outer column 5 is provided with an upper center pipe 4, a valve seat 9 and a lower center pipe 12. The upper center pipe 4 is connected to the lower center pipe 12 through the valve seat 9, wherein the side walls of the upper center pipe 4 and the lower center pipe 12 Both are provided with side holes; the inner side of the upper central tube 4 is provided with an upper sliding sleeve 31 corresponding to the side hole and relatively slidable, and a telescopic upper A rubber sleeve 34; the inner side of the lower central tube 12 is provided with a sliding sleeve 25 corresponding to its side hole and relatively slidable, and a retractable lower rubber sleeve 20 is arranged between the sliding sleeve 25 and the lower end cover 17; wherein The upper sliding sleeve 31 is matched with the side hole position of the inner wall of the upper central tube 4, and a sealing ring is arranged on the mating surface between the upper sliding sleeve 31 and the upper central tube 4, so that the air supply in the upper hole of the upper central tube 4 , the upper sliding sleeve 31 can slide relative to the upper central tube 4 and form a dynamic seal; the lower sliding sleeve 25 fits at the position of the side hole on the inner wall of the lower central tube 12, and the lower sliding sleeve 25 cooperates with the lower central tube 12 There is a sealing ring on the surface, so that when the upper side hole of the lower central pipe 12 supplies air, the sliding sleeve 25 can slide relative to the lower central pipe 12 and form a dynamic seal; The gas valve 10 and the gas outlet valve 26; wherein the inlet valve 10 and the gas outlet valve 26 are located on the same circumference of the valve seat 9, and are arranged at a distance of 180° from each other; the upper and lower ends of the valve seat 9 are respectively screwed to the upper center pipe 4 The lower end, the upper end of the lower central pipe 12, and sealing rings are respectively provided at the joints of the valve seat 9 and the upper central pipe 4, and the valve seat 9 and the lower central pipe 12; wherein the upper sliding sleeve 31 and the upper rubber sleeve 34 An upper protective cover 2 33 is provided, and an upper protective cover 35 is provided between the upper rubber tube 34 and the upper end cover 37; a lower protective cover 21 is provided between the lower rubber tube 25 and the lower rubber tube 20, and the lower rubber tube 20 and the lower end cover 17 are provided with a lower protective sleeve 2 18; wherein the upper end cover 37 is threadedly connected with the outer pipe string 5, and the upper end cover 37 is sealed with the outer pipe string 5 and the upper center pipe 4 respectively through a sealing ring ; The upper end cover 37 is provided with an air intake hole 2 aligned with the gap between the outer pipe column 5 and the upper center pipe 4, and the upper end cover 37 is provided with a suspension ring; the lower end cover 17 is threaded to connect the outer pipe column 5. The lower end cover 17 is sealed with the outer pipe string 5 and the lower center pipe 12 respectively through the sealing ring.

In the external oil casing air seal detection device of the utility model, the upper end of the outer pipe string is connected to the upper end cover through a thread, and the upper end cover is provided with a through hole, through which the detection gas can be introduced into the detection device, which is used for checking the oil casing. The lower end of the outer pipe string is connected with a lower end cover, which can seal the gap between the outer pipe string and the lower center pipe, so that a gas storage space can be formed between the outer pipe string and the upper and lower center pipes. There are side holes on the outer sides of the upper and lower central tubes, so that the gas between the outer string and the upper and lower central tubes can flow into the piston cavity formed by the upper and lower sleeves, and the gap between the upper sliding sleeve and the upper central tube There is a gap between the lower sleeve and the lower central tube. After the high-pressure gas enters, the upper sliding sleeve can only move toward the upper end cover, and the lower sliding sleeve can only move toward the lower end cover. There is an upper rubber tube above the upper sliding sleeve. Therefore, the upper sliding sleeve can push the upper rubber sleeve to compress it and fit it to the outer wall of the oil casing, and then set it. After being fitted, it is set to form a closed space between the upper rubber sleeve and the lower rubber sleeve. This space is just located at the coupling of the oil casing, so that the oil can be judged by detecting the gas at the coupling inside the oil casing. The airtightness of the bushing. The utility model is an external oil-casing air-tight detection device with simple structure, low cost and high detection accuracy. It provides a new detection method for more accurate judgment of the oil-casing gas sealing performance and ensures the safety in the process of oil and gas development and exploration. Since the entire device is located outside the oil-casing pipe, it is not subject to size restrictions. , so it is especially suitable for testing the airtightness of small-sized oil casings. Among them, the upper end cover and the outer pipe string are connected by threads, and an O-ring is provided on the outside of the upper end cover to prevent the detection gas from leaking from the gap between the upper end cover and the outer pipe string, and an O-ring is provided on the inner side of the upper end cover. Prevent the detection gas from leaking from the gap between the upper end cover and the upper central tube. There is an air inlet hole on the upper end cover. The gravity of the detection device, the lower end cover and the outer pipe string are connected by threads, which can seal the gap between the outer pipe string and the lower center pipe, and at the same time, there is an O-ring on the outside of the lower end cover to prevent the detection gas from passing through the upper end cover and the outer pipe. The gap between the columns leaks, and the inner side of the upper end cover is equipped with an O-ring to prevent the detection gas from leaking from the gap between the upper end cover and the upper central tube.

As shown in Figures 1 to 3, the detection method of the external oil casing gas seal detection device of the present invention includes the following steps:

Step 1. Put the detection device on the outside of the oil casing to be tested, and align the inlet valve 10 and the outlet valve 26 with the joint 28 outside the oil casing;

Step 2. Send the detection gas from the air inlet 2 into the gap between the upper central tube 4 and the outer column 5, and enter the gap between the upper sliding sleeve 31 and the upper central tube 4 through the side hole of the upper central tube 4 Gap; As the air pressure increases, the detection gas pushes the upper sliding sleeve 31 and the protective sleeve 33 to move toward the upper end cover 37, so that the upper protective sleeve 33 and the upper protective sleeve 35 simultaneously squeeze the upper rubber cylinder 34, and the upper The rubber tube 34 is compressed to achieve contact with the outer wall of the oil casing; at the same time, the detection gas pushes the lower cover 25 and the protective cover 1 21 to move to the lower end cover 17, so that the lower protective cover 1 21 and the lower protective cover 2 20 simultaneously squeeze the lower rubber tube 20. The lower rubber tube 20 is compressed to achieve contact setting with the inner wall of the oil casing, and forms an annular sealing space between the outer wall of the oil casing and the inner wall of the detection device;

Step 3, continue to supply the detection gas into the air inlet 2, and the detection gas passes through the gap between the outer casing 5 and the upper central pipe 4, and between the outer casing 5 and the lower central pipe 12; when the pressure reaches a certain value, carry out The gas valve 10 is opened, and the detection gas flows into the annular sealed space between the outer wall of the oil casing and the inner wall of the detection device through the inlet valve 10;

Step 4. A gas detector is installed at the joint 28 inside the oil casing to detect the gas on the inner wall of the oil casing, and judge the air tightness of the oil casing by detecting whether the gas leaks;

Step 5. After the detection is over, release the detection gas between the outer pipe string 5 and the upper sliding sleeve 31, and between the outer pipe string 5 and the lower sleeve 25. At this time, the inlet valve 10 is closed, and the outlet valve 26 is opened; the detection gas Enter the gap between the outer pipe string 5 and the upper central pipe 4 and the lower central pipe 12 through the outlet valve 26, and discharge the detection device through the air inlet 2 for recovery. At this time, the rubber cartridge is unsealed and the detection device returns to the initial working state. ; And the detection device is taken out from the outside of the oil casing.

The external oil casing gas seal detection device of the utility model has the advantages of simple structure, light weight, low cost, convenient transportation, simple operation of the detection method, high sensitivity, reliable operation and good stability, and can effectively remove the leaking oil casing; When working, it is placed outside the coupling of the oil casing, and the gas detector is used to detect the gas on the inner wall of the oil casing, and the air tightness of the oil casing is judged by detecting whether the gas leaks, which effectively solves the problem of gas seal detection of the small size oil casing. The external oil casing gas seal detection device and detection method of the utility model provide a new detection method for more accurately judging the gas seal performance of the oil casing and ensure the safety in the process of oil and gas development and exploration. The outside of the casing is not limited in size, so it is especially suitable for testing the airtightness of small-sized oil casings.

The utility model is not limited to the aforementioned specific embodiments. The utility model extends to any new feature or any new combination disclosed in this specification, as well as the steps of any new method or process or any new combination disclosed.

Claims (5)

1. an external tubing and casing pneumatic sealing test device, is characterized in that: comprise outer tubing string (5), and the upper and lower side of described outer tubing string (5) arranges upper end cover (37) and bottom end cover (17) respectively; Upper center tube (4), valve seat (9) and lower center tube (12) is provided with in described outer tubing string (5), described upper center tube (4) connects lower center tube (12) by valve seat (9), wherein upper center tube (4) and the sidewall of lower center tube (12) is equipped with side opening; Described upper center tube (4) inner side is provided with corresponding with its side opening, and can the upper sliding sleeve (31) of relative sliding, is configured with telescopic upper packing element (34) between described upper sliding sleeve (31) and upper end cover (37); Described lower center tube (12) inner side is provided with corresponding with its side opening, and can the low sleeve (25) of relative sliding, is configured with telescopic lower rubber cylinder (20) between described low sleeve (25) and bottom end cover (17).

2. external tubing and casing pneumatic sealing test device as claimed in claim 1, it is characterized in that: described upper sliding sleeve (31) is matched with the side opening position of upper center tube (4) inwall, described upper sliding sleeve (31) is provided with O-ring seal with the mating surface of upper center tube (4), when making air feed in upper center tube (4) upper-side hole, described upper sliding sleeve (31) can slide relative to upper center tube (4) and form motive seal; Described low sleeve (25) is matched with the side opening position of lower center tube (12) inwall, described low sleeve (25) and lower center tube (12) mating surface are provided with O-ring seal, when making lower center tube (12) upper-side hole air feed, described low sleeve (25) can slide relative to lower center tube (12) and form motive seal.

3. external tubing and casing pneumatic sealing test device as claimed in claim 1 or 2, is characterized in that: described valve seat (9) is furnished with the relative gas admittance valve in position (10) and air outlet valve (26); Wherein gas admittance valve (10) and air outlet valve (26) are positioned at the circumferentially same of valve seat (9), and spaced 180 ° of layouts; The upper and lower end of described valve seat (9) is threadedly connected to upper center tube (4) lower end, lower center tube (12) upper end respectively, and is respectively equipped with O-ring seal at valve seat (9) and upper center tube (4), valve seat (9) with the junction of lower center tube (12).

4. external tubing and casing pneumatic sealing test device as claimed in claim 3, it is characterized in that: between described upper sliding sleeve (31) and upper packing element (34), be provided with protective sleeve two (33), between upper packing element (34) and upper end cover (37), be provided with upper protective sleeve one (35); Be provided with lower protective sleeve one (21) between described low sleeve (25) and lower rubber cylinder (20), between lower rubber cylinder (20) and bottom end cover (17), be provided with lower protective sleeve two (18).

5. external tubing and casing pneumatic sealing test device as claimed in claim 4, it is characterized in that: described upper end cover (37) and outer tubing string (5) are threaded connection, described upper end cover (37) is sealed with outer tubing string (5), upper center tube (4) respectively by O-ring seal; Described upper end cover (37) is provided with the air admission hole (2) aiming at gap between outer tubing string (5) and upper center tube (4), and described upper end cover (37) is provided with suspension ring; Described bottom end cover (17) is threaded connection outer tubing string (5), and described bottom end cover (17) is sealed with outer tubing string (5), lower center tube (12) respectively by O-ring seal.