CN107314869B

CN107314869B - Air tightness detection device for casing joint

Info

Publication number: CN107314869B
Application number: CN201710547525.0A
Authority: CN
Inventors: 胡刚; 王国荣; 赵世平; 王璐瑶; 王陶; 岳昌洁; 刘银; 廖聪冲
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2017-07-06
Filing date: 2017-07-06
Publication date: 2020-08-07
Anticipated expiration: 2037-07-06
Also published as: CN107314869A

Abstract

The invention relates to the technical field of oil and gas drilling, well completion and oil and gas casing, in particular to a gas tightness detection device of a casing joint, which comprises a barrel and air bags arranged at two ends of an inner cavity of the barrel, wherein an air hole and an air passage communicated with the air bags are arranged in the barrel, the air passage is communicated with the air bags and the outer wall of the barrel, the air hole is communicated with the inner cavity of the barrel and the outer wall of the barrel between the two air bags, the air bags cannot be greatly abraded, the abrasion can be almost ignored, and in addition, compared with the mode that the air bags are mechanically pushed by other parts, the scheme is directly inflated, all parts of the air bags are uniformly stressed, the condition of non-uniform.

Description

Air tightness detection device for casing joint

Technical Field

The invention relates to the technical field of oil and gas drilling, well completion and oil and gas casing pipes, in particular to a gas tightness detection device for a casing joint.

Background

The annual average petroleum consumption of China is up to hundreds of millions of tons, but the petroleum exploitation process is complex, and the safety factor requirement is high. The oil casing pipe is a pipe which is most used for oil exploitation, the oil casing pipe is screwed through internal and external threads, the casing pipes are connected end to end and deeply enter a service underground, and the oil casing pipe column can protect a well wall and can separate oil, gas and a water layer. The single oil casing pipe must have high pressure resistance and corrosion resistance, and the whole oil casing pipe column should also meet good air tightness. At present, the casings are connected through the clamp, the clamp used by an ordinary oil well reaches hundreds, and the problem of insufficient air tightness at any clamp connection position can cause the insufficient air tightness of the whole oil casing pipe column system. Once the air tightness is insufficient, pressure fluctuation can be caused, the safety of the sleeve is influenced, great safety hazards exist, and meanwhile unexpected loss can be caused to the environment and the society.

It has been shown from a number of experiments that the gas tightness of an oil casing string system depends to a large extent on the tightness of the casing joint. Due to the complexity of the working environment of the casing, the loads are also very complex, and the lack of air tightness caused by the factors is difficult to avoid. However, problems due to technical problems in the connection of the casing, handling problems, as well as the precision requirements for the machining and insufficient protective measures in the transport can be avoided.

In order to ensure airtightness between the casings, airtightness detection thereof is required. The patent CN104764566A and CN105319020A of national oil and gas sleeve gas seal detection expert's Rong professor of China all disclose concrete scheme that detects, but still there are some inadequacies in the in-service use process, patent CN104764566A is when detecting, because the gasbag receives axial pressure, make it produce great friction along the outside slip of pipe wall, there is certain loss to the gasbag, adopt external pressure to detect time measuring simultaneously because difficult alignment also can produce wearing and tearing to the gasbag when nested, the problem of gasbag wearing and tearing exists in patent CN105319020A equally, and need the field operation of testing personnel when patent CN105319020A detects, there is certain potential safety hazard.

Disclosure of Invention

The invention aims to: aiming at the problem that the conventional air bag is easy to wear, the air tightness detection device for the sleeve joint is provided, and the problem can be alleviated.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a casing joint's gas tightness detection device, includes the barrel and sets up the gasbag at barrel inner chamber both ends, be provided with the gas pocket in the barrel and with the communicating air flue of gasbag, the air flue intercommunication the gasbag with the barrel outer wall, the gas pocket intercommunication is two barrel inner chamber and barrel outer wall between the gasbag.

Preferably, the balloon is annular. Similar to a swim ring.

Preferably, the balloon is fixedly disposed within the barrel.

Preferably, the airbag is provided with a thickened portion at a portion contacting the cylindrical body.

Preferably, the surface of the balloon is provided with a concave-convex portion.

Preferably, the inner cavity of the cylinder is provided with a recess for accommodating the air bag.

Preferably, the cylinder is provided with a stopper, and the stopper is arranged on one side of the air bag close to the cylinder port. The stop rings are arranged along the circumferential direction of the air bag to form stop rings, namely one-piece annular stop blocks.

Preferably, the stopper is pivotally disposed on the barrel, and a torsion spring is disposed between the stopper and the barrel to restore the stopper after pivoting under an external force.

In conclusion, due to the adoption of the technical scheme, the beneficial effects of the application are as follows: when the air bag is used, the air bag and the sleeve can be tightly matched only by inflating and deflating, the air bag is not required to be mechanically pushed to compress the sleeve, so that the air bag is not greatly abraded, the abrasion can be almost ignored, and compared with the method that the air bag is mechanically pushed by other parts, the scheme directly inflates, all parts of the air bag are uniformly stressed, the condition of non-uniform stress is avoided, and the service life of the air bag can be prolonged; in addition, the mode of inflation and deflation is adopted, the operation can be realized only by a gas compressor, the remote operation can be realized, the operation close to a sleeve is not needed, and the safety is better.

Drawings

FIG. 1 is a schematic structural diagram of a detection device of the present patent application;

FIG. 2 is a schematic cross-sectional view of a detection device of the present application;

FIG. 3 is a schematic structural diagram of a stopper according to the present application;

the labels in the figure are: 3-roller component, 4-screw, 5-hanging ring, 6-cylinder, 7-air bag, 9-torsion spring, 10-stop block, 36-air passage, 37-air hole, 51-sleeve joint, 52-sleeve, 53-monitoring component and 62-annular chamber.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1-3, a device for detecting the air tightness of a casing joint comprises a cylinder 6 and air bags 7 arranged at two ends of the inner cavity of the cylinder 6, wherein an air hole 37 and an air passage 36 communicated with the air bags 7 are arranged in the cylinder 6, the air passage 36 is communicated with the air bags 7 and the outer wall of the cylinder 6, the air hole 37 is communicated with the inner cavity of the cylinder 6 between the two air bags 7 and the outer wall of the cylinder 6, thus, when in use, the tight fit between the air bag 7 and the sleeve 52 can be realized only by inflating and deflating, the air bag 7 is not required to be mechanically pushed to compress the air bag 7 so as to compress the sleeve 52, therefore, the air bag 7 cannot be greatly abraded, the abrasion can be almost ignored, and compared with the method that other parts are adopted to mechanically push the air bag 7, the scheme is directly inflated, all parts of the air bag 7 are uniformly stressed, the condition of non-uniform stress does not exist, and therefore the service life of the air bag 7 can be prolonged; in addition, the mode of inflation and deflation is adopted, only a gas compressor is needed to realize, remote operation can be realized, operation close to the sleeve 52 is not needed, and the safety is better.

When in use, the sleeve 52 is put into the detection device, the sleeve joint 51 is positioned between the two air bags 7, the leakage gas monitoring device is arranged in the sleeve 52 and is close to the joint, then the air bags 7 are inflated through the air passages 36, the air bags 7 are inflated and contact the outer wall of the sleeve 52, a closed annular chamber 62 is formed among the outer wall of the sleeve 52, the inner wall of the barrel 6 and the air bags 7, when the pressure in the air bags 7 reaches a preset value and the pressure between the air bags 7 and the outer wall of the sleeve 52 is enough, the air is ventilated to the annular chamber 62 through the air holes 37, when the pressure in the annular chamber 62 reaches the preset value, the ventilation is stopped, the pressure value is kept within a preset time, the monitoring value of the monitoring part 53 is checked, if gas is found in the sleeve 52, the gas in the annular chamber is indicated to be leaked into the sleeve 52 through the sleeve joint 51, i.e., the sealing performance of the casing joint 51 is low.

Specifically, still be provided with three gyro wheel part 3 on the barrel 6, be convenient for transfer detection device to the shaft bottom, when using, adopt the rope to pass the gyro wheel to wholly hang barrel 6, control the height of barrel 6 in the well head through the extension or shorten the rope, of course, for the insurance, fixedly on barrel 6 is provided with link 5, passes link 5 through the rope, avoids unable use after the gyro wheel damages, has dual fail-safe.

Specifically, gasbag 7 is cyclic annular, and is similar to the water wing, so, the annular cavity 62 that the leakproofness is better is formed to envelope sleeve pipe 52 that can be better, avoids getting into the gas leakage of annular cavity 62.

Specifically, gasbag 7 is fixed to be set up in barrel 6, more specifically, through the glue adhesion to avoid gasbag 7 landing in the use, adopt glue, low cost.

Specifically, the airbag 7 is provided with a thickened portion at a portion contacting the cylinder 6, so as to prolong the service life of the airbag 7.

Specifically, the surface of the air bag 7 is provided with concave-convex parts, so that the air bag 7 is prevented from being too tight with the outer wall of the sleeve 52 in the expansion or contraction process, the air bag 7 can be expanded or contracted better, the abrasion rate can be reduced, and more specifically, the surface of the air bag 7 is provided with wavy patterns or zigzag patterns, like various patterns on a tire. The inner cavity of the cylinder 6 is provided with a recess for accommodating the airbag 7.

Specifically, the barrel 6 is provided with the stopper 10, and the stopper 10 is arranged on one side of the airbag 7 close to the port of the barrel 6 to shield the airbag 7 when the airbag 7 expands, so as to prevent the airbag 7 from expanding out of the gap between the barrel 6 and the sleeve 52 and from scratching the airbag 7, and more specifically, the stopper 10 is arranged along the circumferential direction of the airbag 7 to form a stopper 10 ring, that is, the stopper 10 is a whole annular stopper 10.

Or, the stopper 10 is arranged on the cylinder 6 in a pivotable manner, when the cylinder 6 is vertically placed, the pivot axis of the stopper 10 is horizontal, and the torsion spring 9 is arranged between the stopper 10 and the cylinder 6, so that the stopper 10 is reset after pivoting under the action of external force, and therefore, the buffer effect is achieved in the expansion process of the air bag 7, and the air bag 7 is prevented from being damaged; more specifically, as shown in fig. 1, 6 stoppers 10 are arranged in a butt joint manner along the circumferential direction of the airbag 7 to form a circle, so that the airbag 7 can be better protected.

Claims

1. The utility model provides a casing joint's gas tightness detection device, its characterized in that, includes barrel (6) and sets up gasbag (7) at barrel (6) inner chamber both ends, be provided with gas pocket (37) in barrel (6) and with communicating air flue (36) of gasbag (7), air flue (36) intercommunication gasbag (7) with barrel (6) outer wall, gas pocket (37) communicate two barrel (6) inner chamber and barrel (6) outer wall between gasbag (7).

2. The device according to claim 1, characterized in that the balloon (7) is ring-shaped.

3. The device according to claim 1, characterized in that the balloon (7) is fixedly arranged within the cylinder (6).

4. Device according to claim 1, characterized in that the balloon (7) is provided with a thickening in the area of contact with the cylinder (6).

5. The device according to claim 1, characterized in that the balloon (7) surface is provided with reliefs.

6. Device according to claim 1, characterized in that the inner chamber of the cylinder (6) is provided with a recess for accommodating the balloon (7).

7. A device according to any one of claims 1-6, characterized in that the barrel (6) is provided with a stop (10), the stop (10) is arranged on the side of the balloon (7) close to the port of the barrel (6), and the stop (10) is arranged along the circumferential direction of the balloon (7) to form a ring of stops (10), i.e. a one-piece ring-shaped stop (10).

8. The device according to claim 7, characterized in that the stopper (10) is pivotably arranged on the barrel (6), and a torsion spring (9) is arranged between the stopper (10) and the barrel (6) to return the stopper (10) after pivoting under the influence of an external force.