CN201532285U - Leak detection tool for clamping and sealing injected gas - Google Patents

Leak detection tool for clamping and sealing injected gas Download PDF

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Publication number
CN201532285U
CN201532285U CN2009202463233U CN200920246323U CN201532285U CN 201532285 U CN201532285 U CN 201532285U CN 2009202463233 U CN2009202463233 U CN 2009202463233U CN 200920246323 U CN200920246323 U CN 200920246323U CN 201532285 U CN201532285 U CN 201532285U
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CN
China
Prior art keywords
sliding sleeve
newel
sealing
loop bar
leak detection
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Expired - Lifetime
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CN2009202463233U
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Chinese (zh)
Inventor
陈蔚鸿
马怀兵
王立志
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Anton Oilfield Services Group Ltd
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Anton Oilfield Services Group Ltd
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Priority to CN2009202463233U priority Critical patent/CN201532285U/en
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Publication of CN201532285U publication Critical patent/CN201532285U/en
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Abstract

The utility model provides a leak detection tool for clamping and sealing injected gas, which comprises two sets of clamping and sealing components and one hollow tubular central post whose two ends are sealed, each set of clamping and sealing components comprises a sliding sleeve and a rubber tube packer, a rubber tube and the sliding sleeve are sleeved on the central post in a sliding mode, a hollow cavity is formed between the sliding sleeve and the central post, the hollow cavity is sealed through a packing ring, a through hole is arranged on the corresponding central post of the hollow cavity and is communicated with a central pipe cavity, two through holes are arranged on the central post and are communicated with the external, wherein two one-way valves are respectively arranged on the two through holes, the checking and conducting directions are reverse, and the conducting direction can be conducted under set pressure difference, thereby forming a pressing passage and a pressure leaking passage. Through holes are arranged on the hollow pipe wall of the hollow post as a leakage checking medium input hole passage for inputting and outputting checking fluid medium into the pipe cavity of the hollow pipe of the central post. The leakage detection tool provided by the utility model has simple structure, high checking reliability, and convenient and feasible field operation.

Description

A kind of leak detection tool of blocking-sealing gas injection
Technical field
The utility model belongs to high-voltage tube string sealing detection range, industrial gas oil oil casing sealing detection range especially, but a kind of leak detection tool of blocking-sealing gas injection of fast detecting oil casing sealing is provided.
Background technology
Pressure duct is after pipe couples together or repairs, often need the sealing detection is carried out in its connection or reparation position, for example need to finish the conveying of oil gas in the petroleum industry with oil casing, oil casing is made up of tubing and casing and aid, and tubing and casing and aid thereof couple together and constitute the passage that oil gas flows.In order to guarantee that the oil gas in oil well and the gas well flows out oil well or gas well according to the channel security of designing requirement, oil casing just needs good sealing.
The way that detects the oil casing sealing in the prior art is: in the laboratory the pin thread of every tubing and casing and aid and box, be connected with male joint with the box of standard respectively, set up confined space, in the tubing and casing confined space, inject a certain amount of high pressure detected gas then, water immersion oil string of casing again, tubing and casing and aid do not emit bubble within a certain period of time, and the sealing of tubing and casing or aid screw thread is described.Detect qualified after, again the oil jacket aid is unloaded from standard spiral shell snapping head, be transported to the working-yard respectively and use.In the working-yard, oil field, tubing and casing or aid are joined together to form the tubing string string by root.Above-mentioned detection method can not be used at the scene, just play for the connecting thread on the tubing and casing in the check of setting the sealing after whether can satisfying connection under the high pressure, promptly check screw thread whether qualified, and the sealing of the actual oil casing junction screw thread that couples together in scene is not tested, breadboard detection conclusion can only illustrate that connecting thread can meet the requirements of seal degree, but can not guarantee that but the sealing situation of reality that the scene is lowered to the screw thread of tubing and casing in the oil gas well or aid is good.
The utility model content
The purpose of this utility model is to improve prior art and has circumscribed problem, and a kind of on-the-spot needs that satisfy are provided, and carries out the leak detection tool of the blocking-sealing gas injection of sealing detection at the scene for the devices such as oil casing that couple together.
The purpose of this utility model is achieved in that
The leak detection tool of the blocking-sealing gas injection that the utility model provides comprises a card envelope instrument, and it comprises two cover card sealing and newels;
Described newel is the hollow tubular of axial tool tube chamber, and the two ends of this hollow tubular are provided with shutoff and seal this tube chamber;
Two cover card sealings are sleeved on both sides on the newel of rigidity.Every cover card sealing comprises the packer of a rigidity sliding sleeve and elastic material system, and it is a packing element.Described packing element and described sliding sleeve in every cover card sealing are set on the described newel slidably, and packing element is near the end of newel, and sliding sleeve is away from this end and the packing element adjacency that offsets; The outer end of described sliding sleeve and packing element is axially arranged with position limiting structure in the newel upper edge, this position limiting structure can make this sliding sleeve and packing element on the newel outer wall vertically at the setpoint distance intrinsic displacement, one end of described packing element is near sliding sleeve, and its other end leans against on the position limiting structure on the newel; Be set as a cavity between described sliding sleeve and the newel adjacently situated surfaces, this cavity is by being installed in the O-ring seal sealing on described sliding sleeve inwall and/or the described newel cylinder; On the newel of described cavity correspondence, be provided with a through hole and be communicated with formation one fluid inlet with described tube chamber, make described cavity be communicated with described tube chamber; On the tube wall of the hollow tubular at the middle part between two described sliding sleeve position limiting structures, be provided with two through holes on the described newel, make the tube chamber of described hollow tubular be in communication with the outside, in these two passages, a retaining valve is set respectively, it is opposite by conducting direction, and this retaining valve is conducting under the pressure reduction of setting on this conducting direction, thereby form a pressurization passageway and a pressure release passage, but this pressurization passageway is being set conducting under the pressure reduction to extraneous direction, otherwise ending forever; But this pressure release passage is to the conducting under set pressure of described tube chamber direction, otherwise ends forever.Through hole also is set as leak detection medium input duct on the hollow tubular tube wall of described newel, is used for tube chamber input or and output test fluid medium to the hollow tubular of newel.
The leak detection tool of this blocking-sealing gas injection is work like this, this leak detection tool is promptly blocked the envelope instrument put into tubing and casing to be detected, be positioned for example both sides of screw buckle, coupling part to be checked, to the chamber of described hollow tubular, feed fluid from described leak detection medium input duct with certain pressure, fluid enters described cavity between sliding sleeve and the newel by the fluid intake on the two cover card sealings, can promote to slide over the extruding packing element that slides on the newel, make packing element under axle pressure, be radially expanded, the tube wall of chucking tubing and casing connecting thread both sides, in tubing and casing, form the confined space of a sealing, promptly finish setting.Set finish before, the pressure in the tube chamber of newel does not reach the set pressure of retaining valve in the pressurization passageway, so this not conducting of retaining valve.Set and finish, continue to feed fluid in hollow tubular, after the set pressure of pressure above the described retaining valve on the pressurization passageway wherein, this retaining valve is opened, and fluid flows into this confined space, this confined space can be full of then, and form certain pressure.At this moment, the not conducting of retaining valve in the pressure release passage is because the pressure of tube chamber and confined space is equal substantially.After static a period of time, can check whether screw thread has leakage.Whether promptly check has fluid to flow to outside the tubing and casing from the junction of tubing and casing.If it is qualified no, to prove that then this connecting portion connects.Leak detection finishes, can be by emptying or the aspirator that on leak detection medium input duct, connects, fluid in the hollow tubular is discharged, pressure in the hollow tubular tube chamber reduces, confined space between this card envelope instrument and the tubing and casing forms pressure reduction, after this pressure reduction reaches the set pressure of retaining valve in the pressure release passage, make retaining valve conducting in the pressure release passage, the pressure in the confined space reduces.Simultaneously, make that the pressure that packing element expands is also laid down, thereby packing element shrinks and restores, and this leak detection tool can be taken out from tubing and casing.
The leak detection medium can be a liquid, also can be gas.
The method that detects can be: when the leak detection medium that charges into hollow tubular was liquid, whether the pressure that can detect in the described confined space decreased in the static time period, if do not reduce, the place's good seal that is spirally connected was described then.
If charging into the fluid of hollow tubular is gas, also can change leak detection with pressure in the above-mentioned detection confined space.Whether can also have gas to spill in the detection of tubing and casing outside hunts leak.Thus, the leak detection tool of this blocking-sealing gas injection also will comprise a gas collection cover, and this gas collection cover comprises two identical semicolumn housings, and a side seams of two halves cylindrical shell is provided with articulated structure and connects, and the padlock that coupling is set on the opposite side corresponding site connects firmly; The two ends of described gas collection cover are provided with a toroidal membrane of the two half ring plate compositions that are similarly identical, and the internal diameter of this toroidal membrane and the external diameter of tested tubing and casing are complementary, the gas collection space that makes a sealing of formation when the gas collection cover is set on the tubing and casing outer wall; On the wall of described gas collection cover, be provided with the detection hole that is in communication with the outside, be used for the detecting instrument that joint detection spills gas.Detecting instrument can be the highly sensitive instrument that can detect the search gas concentration change delicately.Correspondingly, the leak detection fluid can be selected inert gas, for example helium.In order to reduce the leak detection cost, the combination gas that can use helium and nitrogen to mix, the content of helium is advisable can make detecting instrument detect, and common helium content is not less than 5% and gets final product.
Between two described dividing plates on the described housing of this gas collection cover, can also be provided with and be similarly the annular central dividing plate that identical two half ring plate are formed, the internal diameter of the described toroidal membrane that the internal diameter of this annular central dividing plate is provided with greater than two ends is complementary with the box cupling external diameter of two tubing and casing that are spirally connected on the tubing and casing.Put at described gas collection two described detection holes are set, it is located at the both sides of described central dividing plate respectively.Spacing between the relative plate face of the dividing plate at described two ends should be longer than the coupling length on the tubing and casing, and the length that grows is 5-50mm.If the too little collection that too mostly is unfavorable for spilling gas of this length that grows, the distance that grows usually are that 20mm is advisable, the thickness of each dividing plate can be 20mm, so, can guarantee the serviceable life of this gas collection cover.
During use, can establish pipeline on the leak detection medium input duct on the card sealing of this leak detection tool and be communicated with the high-pressure fluid conveying device.Can also connect the pressure release branch road on this input duct.Perhaps, a through hole is set on described hollow tubular again, which is provided with atmospheric valve, use when being used for pressure release.
Usually, the tensimeter of precision of leak detection can be installed on the pipeline that is provided with on the leak detection medium input duct.
Further, on newel, an end of described packing element is near sliding sleeve, and its other end leans against on the newel.Be preferably in a sheathed elasticity control loop between the position limiting structure on described packing element and the newel.In fluid compression packing element, also compress described elasticity control loop.When leak detection finished part, the medium of will hunting leak was discharged from described cavity, and described control loop loses at sliding sleeve under the state of axial force, can provide enough auxiliary packing elements of elastic force axially to reset.
Described newel can be interconnected by upper sliding sleeve bar, downslide loop bar and venthole pipe nipple to be formed, and this venthole pipe nipple is a hollow short tube, respectively is provided with a screw socket at axial two ends; The axial hole that axially has perforation of described upper sliding sleeve bar, described downslide loop bar axially have an axial hole that does not connect, the respective end that is connected with venthole pipe nipple two ends of described slide down loop bar be provided with the venthole pipe nipple on the end that is spirally connected that is complementary of screw socket, be spirally connected with described venthole pipe nipple, therebetween by O-ring seal sealing, and make axial hole on the slide down loop bar formation fluid main channel that is connected with pipeline on the venthole pipe nipple.
On the sidewall of described venthole pipe nipple, be provided with two through holes and form described pressurization passageway and pressure release pressure passageway.
Particularly, the outer wall of described slide down loop bar is three grades of multidiameters, be connected an end with described venthole pipe nipple and be butt end, by it to the left or to the right, form four gradually thin ladder sections, hoop is provided with through hole on the slide down loop bar sidewall at the close convex shoulder position of inferior thin segment, two described sliding sleeves in the described two cover card sealings have with described slide down loop bar on the ladder axially extending bore that is complementary of multidiameter, be set on respectively on the slide down loop bar, one end of described sliding sleeve is spacing by the described axial limiting of the convex shoulder formation between the thickest section and inferior thick section on the described slide down loop bar, sheathed one described packer is packing element and described two the sliding sleeve ends adjacency that offsets on the thinnest shaft part of described slide down loop bar, between the shoulder hole hole wall of the inferior thin segment of described slide down loop bar and low sleeve correspondingly, form a gap and constitute described cavity, corresponding with the described hoop through hole on the described slide down loop bar, on the described sliding sleeve up and down at the two ends in this gap and/or corresponding described slide down loop bar, be provided with O-ring seal, make that this gap is sealed.
Establish screw thread in the outer end of thin shaft part at described slide down loop bar, be spirally connected on it and cap constitutes the axial limiting structure that described packer is the packing element outside.
The instrument that is the sphere termination of being spirally connected respectively in the outside of described slide down loop bar the above and cap imports head and has the instrument connector of perforation.
The leak detection tool of the blocking-sealing gas injection that the utility model provides, simple in structure, detecting reliability is high, can hunt leak for the tubing and casing that couples together by execute-in-place, and it is easy to operation, cooperate with the device that can produce the high pressure search gas fast, can hunt leak to each connecting portions such as oil pipes at the scene fast and efficiently, each connects the connecting portion leak detection of tubing and casing and can finish in 1-2 minute.By comparison, existing other detection technique each detection time all is no less than 10 minutes.
Below by drawings and Examples the utility model is described further.
Description of drawings
The structural representation of the leak detection tool of the blocking-sealing gas injection that Fig. 1 provides for the utility model;
The leak detection tool sectional structure synoptic diagram of the blocking-sealing gas injection that Fig. 2 provides for the utility model;
Fig. 2 a, Fig. 2 b and Fig. 2 c are respectively A, the B of Fig. 2 and the partial enlarged drawing at C three places;
The sectional structure synoptic diagram of the venthole pipe nipple in the leak detection tool of the blocking-sealing gas injection that Fig. 3 provides for the utility model;
The sectional structure synoptic diagram of the gas collection cover in the leak detection tool of the blocking-sealing gas injection that Fig. 4 provides for the utility model;
The side-looking structural representation of the leak detection tool of the blocking-sealing gas injection that Fig. 5 provides for the utility model presents gas collection cover end face structure.
Embodiment
The leak detection tool of the blocking-sealing gas injection that the utility model provides, it comprises card envelope instrument and gas collection cover,
Shown in Fig. 1,2,4 and 5, described card envelope instrument comprises two cover card sealing and newels; Described newel is the hollow tubular of vertical tool central lumen, and the two ends of this hollow tubular are provided with shutoff blocked center tube chamber; Two cover card sealings are sleeved on both sides on the newel of rigidity.Every cover card sealing comprises the packer of a rigidity sliding sleeve and elastic material system, and it is a resilient material glue tube.
Particularly, as Fig. 1, shown in 2, newel 10 is by upper sliding sleeve bar 11, downslide loop bar 12 and venthole pipe nipple 13 interconnect composition, venthole pipe nipple 13 is a hollow short tube, as shown in Figure 3, respectively be provided with a screw socket 131 at the two ends of tube axial, be used to connect the slide down loop bar, as shown in Figure 2, the axial hole that axially has perforation of upper sliding sleeve bar 11, downslide loop bar 12 axially have an axial hole that does not connect, the respective end that is connected with venthole pipe nipple 13 two ends of slide down loop bar be provided with venthole pipe nipple 13 on screw socket 131 be complementary be spirally connected the end 11a, 12a, be spirally connected with the venthole pipe nipple, O RunddichtringO 131a sealing is set therebetween, and make axial hole on the slide down loop bar formation fluid main channel P that is connected with pipeline on the venthole pipe nipple 13.On the sidewall of venthole pipe nipple 13, be provided with two through holes and form a pressurization passageway 132 and pressure release pressure passageway 133, on these two passages, a retaining valve is set respectively, it is opposite by conducting direction, but the retaining valve in the pressurization passageway 132 is to the conducting under certain pressure of extraneous direction, otherwise ends forever; But the retaining valve in the pressure release passage 133 is to the conducting under certain pressure of pipeline chamber direction, otherwise ends forever.
As Fig. 2, shown in Fig. 2 b, the outer wall of downslide loop bar 12 is three grades of multidiameters, it is connected an end and is butt end with venthole pipe nipple 13, by it left, form four gradually thin ladder sections, hoop is provided with through hole 121 on the downslide loop bar sidewall at the close convex shoulder position of inferior thin segment h, one low sleeve 14 have with downslide loop bar 12 on the ladder axially extending bore that is complementary of multidiameter, be set on the downslide loop bar 12, one end of low sleeve 14 is by the convex shoulder 12b axial limiting between the thickest section and inferior thick section on the downslide loop bar, a sheathed lower packet 15 is that resilient material glue tube 15 offsets and adjacency with low sleeve 14 ends on downslide loop bar 12 the thinnest axle 12c sections, between the shoulder hole hole wall of the inferior thin segment 12h of downslide loop bar 12 and low sleeve correspondingly 14, form a gap a, it is corresponding with described hoop through hole 121 on the downslide loop bar 12, between the low sleeve at the two ends in this gap and downslide loop bar, be provided with O RunddichtringO 12a, 14a makes that this gap a is sealed.Screw thread is established in outer end at downslide loop bar 12 the thinnest shaft part 12c, be spirally connected on it and cap 16 as the axial limiting spare of packing element 15, and the outside downslide loop bar of cap on the be spirally connected instrument that is the sphere termination import 17.
With similarly above-mentioned, the outer wall of upper sliding sleeve bar 11 also is three grades of multidiameters, one section that is connected with the venthole pipe nipple is butt end, by it to the right, form four gradually thin ladder sections, hoop is provided with through hole on the upper sliding sleeve bar sidewall at the close convex shoulder position of inferior thin segment, one upper sliding sleeve 18 have with upper sliding sleeve bar 11 on the ladder axially extending bore that is complementary of multidiameter, be set on the upper sliding sleeve bar 11, one end of upper sliding sleeve 18 is by the convex shoulder axial limiting between the thickest section and inferior thick section on the upper sliding sleeve bar 11, and a sheathed upper packer 19 is that resilient material glue tube 19 offsets and adjacency with upper sliding sleeve 18 ends on the thinnest shaft part of upper sliding sleeve bar 11.Between the shoulder hole hole wall of the inferior thin segment of upper sliding sleeve bar 11 and upper sliding sleeve correspondingly 18, form a gap, corresponding with described hoop through hole on the upper sliding sleeve bar 11.On the upper sliding sleeve 18 at the two ends in this gap and upper sliding sleeve bar 11, be provided with the O RunddichtringO, make that this gap is sealed.Establish screw thread in the outer end of thin shaft part at upper sliding sleeve bar 11, be spirally connected on it and cap 16 as the axial limiting spare of packing element 19, and the outside upper sliding sleeve of cap do the instrument connector 17a that is spirally connected on 11, can have perforation on it, be used to wear steel wire, be convenient to this testing tool be put into tubing and casing by steel wire.A fluid input duct also is set on described newel makes described fluid main channel P be in communication with the outside, it is connected by for example high-pressure hose Q with the high-pressure fluid feedway when using.
Present embodiment uses liquid as the leak detection medium.When using, the instrument that this leak detection tool is promptly blocked the envelope instrument imports 17 and puts into tubing and casing to be detected down, being positioned connecting thread button to be checked partly locates, packing element on it is positioned at the both sides of screw buckle, in described fluid main channel P, feed liquid by high-pressure hose Q with certain pressure, liquid enters described gap a (seeing Fig. 2 b) by the hoop passage on upper sliding sleeve bar 11 and the downslide loop bar 12, can promote slide down is enclosed within on the slide down loop bar and moves and i.e. two packing elements of extruding upper packer 15 and lower packet 19, make packing element under axle pressure, be radially expanded, the tube wall of chucking tubing and casing connecting thread both sides forms a confined space, promptly finishes setting.Set in the process in foundation, because the pressure among the P of fluid main channel does not reach the conducting set pressure of retaining valve in the pressurization air flue 132, the not conducting of retaining valve in the pressurization passageway, and the retaining valve in the pressure release passage 133 is by can conducting outwards not leaking gas.Set end, continue in the hollow tubular of newel, to feed liquid, after the set pressure of pressure wherein above the described retaining valve in the pressurization passageway 132, this retaining valve is opened, liquid flows into this confined space, this confined space can be full of then, and form certain pressure.At this moment, the not conducting of retaining valve in the pressure release passage.After static a period of time, can check whether screw thread has leakage.For example, can block the inductive head that high-precision tensimeter or pressure transducer are set on the high-pressure hose that connects on the fluid input duct of envelope instrument at this, detected pressures changes, if there is pressure to reduce, illustrates that then there is leakage the tubing and casing junction.Leak detection finishes, and high-pressure hose can be connected aspirator, and the liquid in the fluid main channel is discharged, pressure in the hollow tubular tube chamber reduces, itself and confined space form pressure reduction, can be so that the retaining valve conducting in the pressure release passage, and the pressure in the confined space can reduce.Simultaneously, make to cause the pressure that packing element expands also to be laid down, thereby, this leak detection tool can be taken out from tubing and casing.
If charging into the leak detection fluid of hollow tubular is gas, except can passing through pressure detection method leak detection as previously mentioned, can also hunt leak by detecting the method that whether has the leak detection dielectric leakage to come out in the tubing and casing outside.Like this, easily collecting detects for the gas that prevents to leak out flies away not, can a gathering-device be set in the tubing and casing outside.
Thus, the leak detection tool of this blocking-sealing gas injection also comprises gas collection cover 20, and shown in Fig. 4,5, this gas collection cover comprises two identical semicolumn cylindrical outer casings 21, one side shaft of two halves cylinder barrel shaped housing is provided with padlock 23 to being articulated and connected by hinge 22 on the opposite side corresponding site; Two ends are provided with a toroidal membrane 24 of the two half ring plate compositions that are similarly identical respectively on the described housing of described gas collection cover, and the external diameter of the internal diameter of this toroidal membrane 24 and tested leakage of oil sleeve pipe is complementary; Make when the gas collection cover be located on the tubing and casing outer wall, seal between two axial seams of two halves cylinder barrel shaped housing and dividing plate and dividing plate and the tube wall, form the gas collection space of a sealing between the outer wall of this gas collection cover and tubing and casing; On the wall of described gas collection cover, be provided with the detection hole that is in communication with the outside, be used for the detecting instrument that joint detection spills gas.Detecting instrument can be the high sensitivity instruments such as mass spectrometer that can detect detected gas delicately.Search gas can select inert gas as spike medium, for example helium.In order to reduce the leak detection cost, the combination gas that can use helium and nitrogen to mix, the content of helium is advisable can make detecting instrument to detect, and normally helium content can reach the spike effect more than 5%.Detect the concentrations of helium that detects in the space by detecting instrument and whether surpass normal concentrations of helium in the air, the decidable detected part has or not leakage according to this, and according to the variable quantity of concentrations of helium, the degree that quantitative test is leaked.
Between two described dividing plates on the described housing of this gas collection cover, can also be provided with and be similarly the annular central dividing plate 25 that identical two half ring plate are formed, the internal diameter of the described toroidal membrane that the internal diameter of this annular central dividing plate is provided with greater than two ends is complementary with the box cupling external diameter of two tubing and casing of screw thread on the tubing and casing.Put at described gas collection two described detection holes 26 are set, it is located at the both sides of described central dividing plate respectively.Spacing between the relative plate face of the dividing plate at described two ends should be longer than the coupling length on the tubing and casing, and the length that grows is 5-50mm.Usually the distance that grows is that 20mm is advisable, and the thickness of each dividing plate can be 20mm.
The toroidal membrane 24 that described gas collection cover two ends are provided with and central dividing plate 25 and shell 21 are connected with bolt, and for example, the relevant position is provided with through hole on described dividing plate and shell wall, wherein wears bolt dividing plate and shell are fixed together.
In said structure, last lower packet is described packing element one end near sliding sleeve up and down, the other end lean against and cap on.Further, when finishing to unload this card envelope instrument, leak detection can allow packing element restore as early as possible in order to make, can slide down loop bar upper sliding sleeve and and cap between a sheathed elasticity control loop (not shown), in leak detection fluid effect compression packing element, also compress described elasticity control loop.When leak detection finishes to pull down the card sealing, fluid to be discharged from described main channel, described control loop loses at sliding sleeve under the state of axial force, can provide enough auxiliary packing elements of elastic force axially to reset.

Claims (10)

1. the leak detection tool of a blocking-sealing gas injection comprises a card envelope instrument, and it comprises two cover card sealing and newels;
Described newel is the hollow tubular of axial tool tube chamber, and the two ends of this hollow tubular are provided with shutoff and seal this tube chamber;
The described card sealing of two covers is sleeved on both sides on the newel of rigidity, and every cover card sealing comprises the packer of a rigidity sliding sleeve and elastic material system, and it is a packing element; Described packing element and described sliding sleeve in every cover card sealing are set on the described newel slidably, and packing element is near the end of newel, and sliding sleeve is away from this end and the packing element adjacency that offsets; The outer end of described sliding sleeve and packing element is axially arranged with position limiting structure in the newel upper edge, this position limiting structure make this sliding sleeve and packing element along the newel outer wall axially at the setpoint distance intrinsic displacement, one end of described packing element is near sliding sleeve, and its other end leans against on the position limiting structure on the newel; Be set as a cavity between described sliding sleeve and newel and this sliding sleeve adjacently situated surfaces, this cavity is by being installed in the O-ring seal sealing on described sliding sleeve inwall and/or the described newel cylinder; On the newel of described cavity correspondence, be provided with a through hole and be communicated with formation one fluid inlet with described tube chamber, make described cavity be communicated with described tube chamber; On the tube wall of the hollow tubular at the middle part between two described sliding sleeve position limiting structures, be provided with two through holes on the described newel, make the tube chamber of described hollow tubular be in communication with the outside, in these two passages, a retaining valve is set respectively, it is opposite by conducting direction, and this retaining valve is conducting under the pressure reduction of setting on this conducting direction, thereby form a pressurization passageway and a pressure release passage, but this pressurization passageway is being set conducting under the pressure reduction to extraneous direction, otherwise ending forever; But this pressure release passage is to the conducting under set pressure of described tube chamber direction, otherwise ends forever; Through hole also is set as leak detection medium input duct on the hollow tubular tube wall of described newel, is used for tube chamber input or and output test fluid medium to the hollow tubular of newel.
2. the leak detection tool of blocking-sealing gas injection according to claim 1, it is characterized in that: also comprise a gas collection cover, this gas collection cover comprises two identical semicolumn housings, and a side seams of two halves cylindrical shell is provided with articulated structure and connects, and the padlock that coupling is set on the opposite side corresponding site connects firmly; The two ends of described gas collection cover are provided with a toroidal membrane of the two half ring plate compositions that are similarly identical respectively, the external diameter of the internal diameter of this toroidal membrane and tested leakage of oil sleeve pipe is complementary, the gas collection cover makes when be located on the tubing and casing outer wall, seal between two axial seams of two halves cylinder barrel shaped housing and dividing plate and dividing plate and the tube wall, form the gas collection space of a sealing between the outer wall of this gas collection cover and tubing and casing; On the wall of described gas collection cover, be provided with the detection hole that is in communication with the outside.
3. the leak detection tool of blocking-sealing gas injection according to claim 2, it is characterized in that: between two described dividing plates on the described housing of this gas collection cover, also be provided with and be similarly the annular central dividing plate that identical two half ring plate are formed, the internal diameter of the described toroidal membrane that the internal diameter of this annular central dividing plate is provided with greater than two ends is complementary with the box cupling external diameter of two tubing and casing that are spirally connected on the tubing and casing; Put at described gas collection two described detection holes are set, it is located at the both sides of described central dividing plate respectively.
4. the leak detection tool of blocking-sealing gas injection according to claim 3, it is characterized in that: the coupling length on the gap ratio measured oil sleeve pipe between the relative plate face of the dividing plate at described two ends is long, and the length that grows is 5-50mm.
5. the leak detection tool of blocking-sealing gas injection according to claim 1 is characterized in that: a sheathed elasticity control loop on the newel between the described position limiting structure on described packing element and the described newel.
6. the leak detection tool of blocking-sealing gas injection according to claim 1, it is characterized in that: described newel is interconnected by upper sliding sleeve bar, downslide loop bar and venthole pipe nipple to be formed, and this venthole pipe nipple is a hollow short tube, respectively is provided with a screw socket at axial two ends; The axial hole that axially has perforation of described upper sliding sleeve bar, described downslide loop bar axially have an axial hole that does not connect, the respective end that is connected with venthole pipe nipple two ends of described slide down loop bar be provided with the venthole pipe nipple on the end that is spirally connected that is complementary of screw socket, be spirally connected with described venthole pipe nipple, therebetween by O-ring seal sealing, and make axial hole on the slide down loop bar formation fluid main channel that is connected with pipeline on the venthole pipe nipple.
7. the leak detection tool of blocking-sealing gas injection according to claim 6 is characterized in that: be provided with two through holes and form described pressurization passageway and pressure release pressure passageway on the sidewall of described venthole pipe nipple.
8. the leak detection tool of high-pressure blocking-sealing gas injection according to claim 6, it is characterized in that: the outer wall of described slide down loop bar is three grades of multidiameters, be connected an end with described venthole pipe nipple and be butt end, by it to the left or to the right, form four gradually thin ladder sections, hoop is provided with through hole on the slide down loop bar sidewall at the close convex shoulder position of inferior thin segment, two described sliding sleeves in the described two cover card sealings have with described slide down loop bar on the ladder axially extending bore that is complementary of multidiameter, be set on respectively on the slide down loop bar, one end of described sliding sleeve is spacing by the described axial limiting of the convex shoulder formation between the thickest section and inferior thick section on the described slide down loop bar, sheathed one described packer is packing element and described two the sliding sleeve ends adjacency that offsets on the thinnest shaft part of described slide down loop bar, between the shoulder hole hole wall of the inferior thin segment of described slide down loop bar and low sleeve correspondingly, form a gap and constitute described cavity, corresponding with the described hoop through hole on the described slide down loop bar, on the described sliding sleeve up and down at the two ends in this gap and/or corresponding described slide down loop bar, be provided with O-ring seal, make that this gap is sealed.
9. the leak detection tool of blocking-sealing gas injection according to claim 6 is characterized in that: establish screw thread in the outer end of thin shaft part at described slide down loop bar, be spirally connected on it and cap constitutes the axial limiting structure that described packer is the packing element outside.
10. the leak detection tool of blocking-sealing gas injection according to claim 9 is characterized in that: the instrument connector that the instrument that is the sphere termination of being spirally connected respectively in the outside of described slide down loop bar the above and cap imports head and has perforation.
CN2009202463233U 2009-09-29 2009-09-29 Leak detection tool for clamping and sealing injected gas Expired - Lifetime CN201532285U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102121865A (en) * 2010-12-18 2011-07-13 山东电力集团公司超高压公司 SF6 (sulfur hexafluoride) gas leakage and collection detector
CN103994863A (en) * 2013-02-20 2014-08-20 中国石油天然气集团公司 Air-tight sealing detection method of threaded connection of oil casing tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102121865A (en) * 2010-12-18 2011-07-13 山东电力集团公司超高压公司 SF6 (sulfur hexafluoride) gas leakage and collection detector
CN102121865B (en) * 2010-12-18 2012-05-23 山东电力集团公司超高压公司 SF6 (sulfur hexafluoride) gas leakage and collection detector
CN103994863A (en) * 2013-02-20 2014-08-20 中国石油天然气集团公司 Air-tight sealing detection method of threaded connection of oil casing tubes

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Assignee: Sichuan Anton Oil & Gas Engineering Technology Services Co., Ltd.

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