CN104075860A - Detection tool for threaded connection air seal and detection method - Google Patents
Detection tool for threaded connection air seal and detection method Download PDFInfo
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Abstract
The invention relates to a detection tool for threaded connection air seal and a detection method, belonging to the technical field of petroleum and natural gas and gas storage. The detection tool mainly comprises a central tube, joints, a rubber barrel assembly, a connection sleeve and a check valve assembly, wherein the connection sleeve is sleeved in the central tube, and located at the axial central position of the central tube; the check valve assembly is sleeved in the central tube, and located in an annular space between the central tube and the connection sleeve; the inner sides of the rubber barrel assembly and the connection sleeve are in threaded connection; and the joints are located at the upper end and the lower end of the detection tool. The detection tool disclosed by the invention is simple in structure, light in weight, convenient for field transport and carrying, low in cost, simple and convenient to operate, high in the accuracy degree of a detection result, stable and reliable in working, and conducive to a user to put forward rectification measures aiming at the failure of the threaded connection air seal according to the detection result, thus guaranteeing the safety of petroleum and natural gas exploration-development and gas storage projects, and providing a new detection way for much accurately judging whether the threaded connection air seal performance of the oil bushing and a downhole tool is failed or not.
Description
Technical field
One of the present invention be threaded hermetic seal testing tool and detection method, belong to petroleum gas and gas storage technical field, be specifically related to a kind of for petroleum natural gas exploration and gas storage engineering tubing and casing, the subsurface tool gas tightness testing tool that is threaded.
Background technology
Along with the continuous increase of the world to petroleum gas requirement, oil-gas exploration and development work also constantly deeply, completion gas testing progressively towards super dark, high temperature, high pressure, highly carry out containing more and more severe operating modes such as corrosive mediums, when exploitation, wellhead pressure is larger, if tubing and casing or subsurface tool are threaded, gas tightness lost efficacy, huge economic loss and environmental pollution will be caused, in order to ensure the safety in production of petroleum gas, current each oil gas field is had higher requirement to on-the-spot tubing and casing or the subsurface tool seal with screwed joint using of exploratory development.
Due to cause tubing and casing or subsurface tool be threaded gas tightness lost efficacy factors be unavoidable, such as colliding with in mismachining tolerance, transport or the operation process of tubing and casing or subsurface tool production run, in addition, cause the factor that the gas tightness that is threaded lost efficacy also to comprise: the unreasonable and sealing surface of the choice and operation of microcorrosion, stop-leak compound, the repeated multiple times use of tubing and casing, torque value scope unclean etc.In petroleum gas production run, if tubing and casing or subsurface tool are threaded, gas tightness lost efficacy and will easily cause tubing leak, thorn oil-break pipe, and later stage workover cost is huge, has major safety risks; If there is casing deformation, " the tiger cage " of controlling rock gas has problem again, and in well, rock gas is uncontrollable, and successive projects construction cannot ensure, will cause uncertain potential safety hazard to environment and society.In field, underground natural gas storage, because air reservoir is long service time, security requirement is high especially, requires stricter to the gas tightness of tubing and casing or subsurface tool.Therefore by detecting tubing and casing or the subsurface tool gas sealing ability that is threaded, stop the seal failure of downhole oil sleeve pipe or subsurface tool hermetic seal screw thread from source, eliminate the potential safety hazard in later stage, reduce to greatest extent because tubing and casing or subsurface tool airtight thread sealing leak the potential danger causing the accident, just become very urgent demand.
It is very necessary that tubing and casing or Downhole Tool to double thread before Oil/gas Well connects the detection that impermeability carries out, but not science of detection means at present, mainly detect by methods such as hydrostatic pressing sealing property test experiments, these methods have gap with actual condition on the one hand from detecting principle, depend on the other hand operating personnel's working experience and Operational Figure Of Merit, thereby strengthen Economics and Management cost, detect effect also unsatisfactory, with present petroleum natural gas exploration and gas storage scene to not fit of the high request of tubing and casing sealing.
China Patent Publication No. 102346089A, open day on February 8th, 2012, denomination of invention is a kind of threaded connection high-pressure gas seal detection tool, this application case discloses a kind of threaded connection high-pressure gas seal detection tool, its weak point is: on, low sleeve is directly respectively with upper, lower rubber cylinder contact, by first, the increase of two seal cavity strokes promotes, low sleeve respectively upwards, lower movement, add and press respectively with this, lower rubber cylinder, due to upper, low sleeve and upper, lower rubber cylinder material is respectively metal material and non-metallic material, the mode of this extruding packing element easily causes packing element to be worn, in reduction, low sleeve serviceable life, increase testing cost, check valve body assembly is made up of the first retaining valve, the second retaining valve and straight channel, by described in its embodiment, require the first retaining valve after upper and lower packing element sets, just to open, because gas diffusibility is better, this structure can cause in the situation that upper and lower packing element does not also set completely gases at high pressure to start by the first retaining valve through the first side opening to the annular space Leak Detection gas between gas tightness measurer and tubing and casing, will increase the time of setting, increase testing cost, reduce and detect effect, upper and lower mandrel adopts solid construction, and gases at high pressure passage, by obtaining in upper and lower mandrel internal drilling, causes package unit weight larger like this, will give and on-the-spotly transport, and carry and make troubles.
Goal of the invention:
The object of the present invention is to provide a kind of simple in structure, cost is lower, accuracy of detection is high, the lightweight gas tightness testing tool that is threaded, in order to coordinate corresponding detection corollary apparatus, check well and use before upper button oil casing threaded whether meet hermetic seal requirement, improve the mechanical integrity of whole pit shaft.
Summary of the invention
For achieving the above object, the technical solution used in the present invention is:
The one gas tightness testing tool that is threaded, comprises pipe core, joint, packing element assembly, coupling sleeve, retaining valve assembly etc.; Coupling sleeve is inserted in pipe core, is positioned at pipe core axial centre position, and coupling sleeve two ends are provided with venthole, return-air hole; Retaining valve assembly is inserted in pipe core, is positioned at the space between pipe core and coupling sleeve; Packing element assembly and coupling sleeve inner side are threaded connection; Joint is positioned at testing tool upper/lower terminal;
Pipe core adopts hollow structure, the nonmetal filling material of inner filling; The corresponding coupling sleeve raised step at the axial centre position of pipe core place, the range of movement of restriction retaining valve assembly; Have the first side opening, the second side opening, the 3rd side opening, the 4th side opening in pipe core annular side, in pipe core, be provided with straight channel, as detecting gas communication passage;
Retaining valve assembly comprises the first retaining valve, the second retaining valve; The first retaining valve, the second retaining valve are inserted in the annular space of coupling sleeve and pipe core, lay respectively at the upper and lower both sides of coupling sleeve raised step, and are provided with glue tube base fixed cover in the first retaining valve upper end, the extreme position that restriction the first retaining valve moves upward; The upper and lower both sides of upper glue tube base fixed cover are respectively equipped with steel ring on glue tube base fixed cover, upper glue tube base fixed cover lower steel ring, upper glue tube base fixed cover is played to location, fixing, upper glue tube base fixed cover inner side is provided with O RunddichtringO in glue tube base fixed cover, be provided with O RunddichtringO under O RunddichtringO on gluing cylinder base fixed cover, upper glue tube base fixed cover outward, prevent from detecting when testing tool is in running order Leakage Gas; The first retaining valve inner side is provided with O RunddichtringO and the first retaining valve steel ring in one group of first retaining valve, outside is provided with two groups of O-ring seals of O RunddichtringO under O RunddichtringO on the first retaining valve, the first retaining valve, prevents from detecting when testing tool is in running order Leakage Gas; The second retaining valve outside is provided with O RunddichtringO in one group of second retaining valve, and inner side is provided with two groups of O-ring seals of O RunddichtringO under O RunddichtringO on the second retaining valve, the second retaining valve, prevents from detecting when testing tool is in running order Leakage Gas;
Packing element assembly comprises packing element assembly, lower rubber cylinder assembly; Upper packing element assembly comprises packing element, upper glue tube base etc., and lower rubber cylinder assembly comprises lower rubber cylinder, lower rubber cylinder seat etc., and upper packing element, lower rubber cylinder adopt sulfuration process to vulcanize respectively and be fixed in glue tube base, lower rubber cylinder seat; Upper and lower packing element assembly lays respectively at the upper and lower both sides of coupling sleeve, is threaded connection in coupling sleeve and is connected and fixed; Between upper packing element and pipe core, be provided with O RunddichtringO under O RunddichtringO on glue tube base, upper glue tube base, prevent from detecting when testing tool is in running order Leakage Gas; Between lower rubber cylinder and pipe core, be provided with lower rubber cylinder seat O RunddichtringO, prevent from detecting when testing tool is in running order Leakage Gas;
Joint comprises top connection, lower sub etc.; Top connection is threaded connection with upper glue tube base and is connected and fixed, and is provided with top connection O RunddichtringO between top connection and pipe core, prevents from detecting Leakage Gas; Lower sub is threaded connection with lower rubber cylinder seat and is connected and fixed, and is provided with lower sub O RunddichtringO between lower sub and pipe core, prevents from detecting Leakage Gas; Enhancing ring connects top connection.
The detection method of the involved in the present invention gas tightness testing tool that is threaded is as follows:
The gas tightness testing tool that is threaded described in a, general is put into detected tubing and casing or subsurface tool, allows side opening place align with tubing and casing, subsurface tool box cupling;
B, detection gas are in straight channel is injected testing tool, and first side opening of flowing through, the second side opening, the 3rd side opening, the 4th side opening, detect gas and enter each confined space in testing tool;
C, along with detect gas flow through the first side opening, the 4th side opening, detect the confined space that gas constantly enters confined space, lower rubber cylinder and the lower rubber cylinder seat of packing element and upper glue tube base, upper and lower packing element is subject to detecting gas and constantly pushes and dilatational strain, finally complete and set, between testing tool and tubing and casing or subsurface tool, form annular sealed space;
D, on, after lower rubber cylinder completes and sets, increase the pressure that enters testing tool detection gas, high pressure detects gas flow through the first side opening, the 4th side opening, constantly add and press, lower rubber cylinder, make, lower rubber cylinder sets more reliable, high pressure detects gas flow through the second side opening, enter the annular sealed space between glue tube base fixed cover and the first retaining valve, the injection rate IR that detects gas along with high pressure constantly increases, this annular sealed space pressure constantly increases, promoting the first retaining valve moves downward, this annular sealed space is further increased, when O RunddichtringO on the first retaining valve is followed the first retaining valve while moving to venthole position, high pressure detects gas and will flow into the annular sealed space forming between testing tool and tubing and casing or subsurface tool by gap,
E, by the helium leak check instrument at tubing and casing, subsurface tool box cupling place, the gas outside tubing and casing, subsurface tool is detected, detect Leakage Gas value by measurement and judge tubing and casing, the subsurface tool gas tightness that is threaded;
F, detection finish, the high pressure that discharges into straight channel detects gas, the first retaining valve back pressure resets, the detection gas forming between testing tool and tubing and casing or subsurface tool in annular sealed space moves upward from return-air hole inflow promotion the second retaining valve, follow the second retaining valve while moving to the 3rd side opening position when O RunddichtringO under the second retaining valve, detect gas and discharge testing tool by direct current channel and reclaim outward;
When g, testing tool inside and outside differential pressure are down to upper and lower packing element solution seal pressure, upper and lower packing element back pressure resets, detect gas respectively from straight channel, annular space between testing tool and tubing and casing, subsurface tool is discharged, the second retaining valve back pressure resets, and final a whole set of testing tool returns to original state;
The gas tightness testing tool that is threaded described in h, general takes out in detected tubing and casing, subsurface tool, and qualified tubing and casing or subsurface tool are lowered in Oil/gas Well after testing, rectify and improve as defective.
Use technique scheme, the present invention compared with prior art has the following advantages and effect: described apparatus structure is simple, lightweight, to be convenient to on-the-spot transport, to carry, cost is lower, easy and simple to handle, testing result degree of accuracy is high, and working stability is reliable, contributes to lose efficacy and propose measures to rectify and reform for the gas tightness that is threaded according to testing result, guarantee construction and subsequent job safety, for more accurately judging that pit shaft integrality provides a kind of new detection approach.
Brief description of the drawings
Fig. 1 is the off working state schematic diagram of a kind of gas tightness testing tool that is threaded of the present invention;
The pressurized operation view of a kind of gas tightness testing tool that is threaded of Fig. 2 the present invention;
The pressure release view of a kind of gas tightness testing tool that is threaded of Fig. 3 the present invention;
In figure: 1, enhancing ring, 2, pipe core, 3, upper glue tube base, 4, upper packing element, 5, O RunddichtringO under upper glue tube base, 6, steel ring on upper glue tube base fixed cover, 7, O RunddichtringO in upper glue tube base fixed cover, 8, O RunddichtringO under upper glue tube base fixed cover, 9, the second side opening, 10, O RunddichtringO on the first retaining valve, 11, venthole, 12, the first retaining valve, 13, box cupling, 14, the 3rd side opening, 15, O RunddichtringO in the second retaining valve, 16, lower rubber cylinder seat O RunddichtringO, 17, tubing and casing or subsurface tool, 18, lower rubber cylinder, 19, lower sub O RunddichtringO, 20, lower sub, 21, straight channel, 22, nonmetal filling material, 23, the 4th side opening, 24, lower rubber cylinder seat, 25, return-air hole, 26, O RunddichtringO under the second retaining valve, 27, O RunddichtringO on the second retaining valve, 28, the second retaining valve, 29, coupling sleeve raised step, 30, O RunddichtringO under the first retaining valve, 31, O RunddichtringO in the first retaining valve, 32, the first retaining valve steel ring, 33, upper glue tube base fixed cover lower steel ring, 34, O RunddichtringO on upper glue tube base fixed cover, 35, upper glue tube base fixed cover, 36, coupling sleeve, 37, the first side opening, 38, O RunddichtringO on upper glue tube base, 39, top connection O RunddichtringO, 40, top connection.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is further described.
As shown in Figure 1, 2, 3, the involved in the present invention gas tightness testing tool that is threaded comprises pipe core, joint, packing element assembly, coupling sleeve, retaining valve assembly; Described coupling sleeve 36 is inserted in pipe core 2, is positioned at pipe core 2 axial centre positions, and coupling sleeve 36 two ends are provided with venthole 11, return-air hole 25; Described retaining valve assembly is inserted in pipe core 2, is positioned at the space between pipe core 2 and coupling sleeve 36; Described packing element assembly and coupling sleeve 36 inner sides are threaded connection; Described joint is positioned at testing tool upper/lower terminal.
As shown in Figure 1, 2, 3, the involved in the present invention gas tightness testing tool that is threaded, described pipe core 2 adopts hollow structure, the nonmetal filling material 22 of inner filling; In the corresponding coupling sleeve raised step 29 in pipe core 2 axial centre position places, the range of movement of restriction retaining valve assembly; Have the first side opening 37, the second side opening 9, the 3rd side opening 14, the 4th side opening 23 in pipe core 2 annular side, in pipe core, be provided with straight channel 21, as detecting gas communication passage.
As shown in Figure 1, 2, 3, the involved in the present invention gas tightness testing tool that is threaded, described retaining valve assembly comprises the first retaining valve 12, the second retaining valve 28; The first retaining valve 12, the second retaining valve 28 are inserted in the annular space of coupling sleeve 36 and pipe core 2, lay respectively at the upper and lower both sides of coupling sleeve raised step 29, and be provided with glue tube base fixed cover 35 in the first retaining valve 12 upper ends, the extreme position that restriction the first retaining valve 12 moves upward; The upper and lower both sides of upper glue tube base fixed cover 35 are respectively equipped with steel ring 6 on glue tube base fixed cover, upper glue tube base fixed cover lower steel ring 33, upper glue tube base fixed cover 35 is played to location, fixing, upper glue tube base fixed cover 35 inner sides are provided with O RunddichtringO 7 in glue tube base fixed cover, be provided with O RunddichtringO 8 under O RunddichtringO 34 on gluing cylinder base fixed cover, upper glue tube base fixed cover outward, prevent from detecting when testing tool is in running order Leakage Gas; The first retaining valve 12 inner sides are provided with O RunddichtringO 31 and the first retaining valve steel ring 32 in one group of first retaining valve, outside is provided with on the first retaining valve 30 liang of group O-ring seals of O RunddichtringO under O RunddichtringO 10, the first retaining valve, prevents from detecting when testing tool is in running order Leakage Gas; Outer 28 sides of the second retaining valve are provided with O RunddichtringO 15 in one group of second retaining valve, and inner side is provided with on the second retaining valve two groups of O-ring seals 26 of O RunddichtringO under O RunddichtringO 27, the second retaining valve, prevent from detecting when testing tool is in running order Leakage Gas.
As shown in Figure 1, 2, 3, the involved in the present invention gas tightness testing tool that is threaded, described packing element assembly comprises packing element assembly, lower rubber cylinder assembly; Upper packing element assembly comprises packing element 4, upper glue tube base 3, and lower rubber cylinder assembly comprises lower rubber cylinder 18, lower rubber cylinder seat 24, and upper packing element 4, lower rubber cylinder 18 adopt sulfuration process to vulcanize respectively and be fixed in glue tube base 3, lower rubber cylinder seat 24; Upper and lower packing element assembly lays respectively at the upper and lower both sides of coupling sleeve 36, is threaded connection in coupling sleeve 36 and is connected and fixed; Between upper packing element 4 and pipe core 2, be provided with O RunddichtringO 5 under O RunddichtringO 38 on glue tube base, upper glue tube base, prevent from detecting when testing tool is in running order Leakage Gas; Between lower rubber cylinder 18 and pipe core 2, be provided with lower rubber cylinder seat O RunddichtringO 16, prevent from detecting when testing tool is in running order Leakage Gas.
As shown in Figure 1, 2, 3, the involved in the present invention gas tightness testing tool that is threaded, described joint comprises top connection 40, lower sub 20; Top connection 40 is threaded connection with upper glue tube base 3 and is connected and fixed, and is provided with top connection O RunddichtringO 39 between top connection 40 and pipe core 2, prevents from detecting Leakage Gas; Lower sub 20 is threaded connection with lower rubber cylinder seat 24 and is connected and fixed, and is provided with lower sub O RunddichtringO 19 between lower sub 20 and pipe core 2, prevents from detecting Leakage Gas; Enhancing ring 1 connects top connection 40.
As shown in Figure 1, 2, 3, tubing and casing gas tightness testing tool involved in the present invention, its detection method is as follows:
The gas tightness testing tool that is threaded described in a, general is put into detected tubing and casing or subsurface tool 17, allows coupling sleeve raised step 29 align with tubing and casing or subsurface tool box cupling 13;
B, detection gas inject in testing tool along straight channel, and flow through the first side opening 37, the second side opening 9, the 3rd side opening 14, the 4th side opening 23 detect gas and enter each confined space in testing tool;
C, along with detect gas flow through the first side opening 37, the 4th side opening 23, detection gas constantly enters the confined space of confined space, lower rubber cylinder 18 and the lower rubber cylinder seat 24 of packing element 4 and upper glue tube base 3, upper packing element 4, lower rubber cylinder 18 are subject to detecting gas and constantly push and dilatational strain, finally complete and set, between testing tool and tubing and casing or subsurface tool 17, form annular sealed space;
D, upper packing element 4, after lower rubber cylinder 18 completes and sets, increase the pressure that enters testing tool detection gas, high pressure detects gas flow through the first side opening 37, the 4th side opening 23, the constantly upper packing element 4 of extruding, lower rubber cylinder 18, make packing element 4, lower rubber cylinder 18 sets more reliable, high pressure detects gas flow through the second side opening 9, enter the annular sealed space between glue tube base fixed cover 35 and the first retaining valve 12, the injection rate IR that detects gas along with high pressure constantly increases, this annular sealed space pressure constantly increases, promoting the first retaining valve 12 moves downward, this annular sealed space is further increased, when O RunddichtringO 10 on the first retaining valve is followed the first retaining valve 12 while moving to venthole position, high pressure detects gas and will flow into the annular sealed space forming between testing tool and tubing and casing or subsurface tool 17 by gap,
E, by the gas detecting instrument at tubing and casing or subsurface tool box cupling 13 places, the gas outside tubing and casing or subsurface tool 17 is detected, detect Leakage Gas value and judge tubing and casing, the subsurface tool gas tightness that is threaded by detecting high pressure;
F, detection finish, the high pressure that discharges into straight channel detects gas, the first retaining valve 12 back pressure reset, the detection gas forming between testing tool and tubing and casing or subsurface tool 17 in annular sealed space moves upward from return-air hole inflow promotion the second retaining valve 28, follow the second retaining valve 28 while moving to the 3rd side opening 14 position when O RunddichtringO 26 under the second retaining valve, detect gas and discharge testing tool by straight channel 21 and reclaim outward;
G, testing tool inside and outside differential pressure are down to packing element 4, lower rubber cylinder 18 while separating seal pressure, upper packing element 4, lower rubber cylinder 18 back pressure reset, detect gas respectively from straight channel 21, annular space between testing tool and tubing and casing or subsurface tool 17 is discharged, the second retaining valve 28 back pressure reset, and final a whole set of testing tool returns to original state;
Described in h, general, be threaded gas tightness testing tool from detected tubing and casing or the interior taking-up of subsurface tool 17, and qualified tubing and casing or subsurface tool are lowered in Oil/gas Well after testing, rectify and improve as defective.
As mentioned above, embodiments of the invention are explained, but as long as not departing from fact inventive point of the present invention and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection scope of the present invention.
Claims (2)
1. the gas tightness testing tool that is threaded, is characterized in that comprising pipe core, joint, packing element assembly, coupling sleeve, retaining valve assembly etc.; Coupling sleeve is inserted in pipe core, is positioned at pipe core axial centre position, and coupling sleeve two ends are provided with venthole, return-air hole; Retaining valve assembly is inserted in pipe core, is positioned at the space between pipe core and coupling sleeve; Packing element assembly and coupling sleeve inner side are threaded connection; Joint is positioned at testing tool upper/lower terminal;
Pipe core adopts hollow structure, the nonmetal filling material of inner filling; The corresponding coupling sleeve raised step at the axial centre position of pipe core place, the range of movement of restriction retaining valve assembly; Have the first side opening, the second side opening, the 3rd side opening, the 4th side opening in pipe core annular side, in pipe core, be provided with straight channel, as detecting gas communication passage;
Retaining valve assembly comprises the first retaining valve, the second retaining valve; The first retaining valve, the second retaining valve are inserted in the annular space of coupling sleeve and pipe core, lay respectively at the upper and lower both sides of coupling sleeve raised step, and are provided with glue tube base fixed cover in the first retaining valve upper end, the extreme position that restriction the first retaining valve moves upward; The upper and lower both sides of upper glue tube base fixed cover are respectively equipped with steel ring on glue tube base fixed cover, upper glue tube base fixed cover lower steel ring, upper glue tube base fixed cover is played to location, fixing, upper glue tube base fixed cover inner side is provided with O RunddichtringO in glue tube base fixed cover, be provided with O RunddichtringO under O RunddichtringO on gluing cylinder base fixed cover, upper glue tube base fixed cover outward, prevent from detecting when testing tool is in running order Leakage Gas; The first retaining valve inner side is provided with O RunddichtringO and the first retaining valve steel ring in one group of first retaining valve, outside is provided with two groups of O-ring seals of O RunddichtringO under O RunddichtringO on the first retaining valve, the first retaining valve, prevents from detecting when testing tool is in running order Leakage Gas; The second retaining valve outside is provided with O RunddichtringO in one group of second retaining valve, and inner side is provided with two groups of O-ring seals of O RunddichtringO under O RunddichtringO on the second retaining valve, the second retaining valve, prevents from detecting when testing tool is in running order Leakage Gas;
Packing element assembly comprises packing element assembly, lower rubber cylinder assembly; Upper packing element assembly comprises packing element, upper glue tube base etc., and lower rubber cylinder assembly comprises lower rubber cylinder, lower rubber cylinder seat etc., and upper packing element, lower rubber cylinder adopt sulfuration process to vulcanize respectively and be fixed in glue tube base, lower rubber cylinder seat; Upper and lower packing element assembly lays respectively at the upper and lower both sides of coupling sleeve, is threaded connection in coupling sleeve and is connected and fixed; Between upper packing element and pipe core, be provided with O RunddichtringO under O RunddichtringO on glue tube base, upper glue tube base, prevent from detecting when testing tool is in running order Leakage Gas; Between lower rubber cylinder and pipe core, be provided with lower rubber cylinder seat O RunddichtringO, prevent from detecting when testing tool is in running order Leakage Gas;
Joint comprises top connection, lower sub etc.; Top connection is threaded connection with upper glue tube base and is connected and fixed, and is provided with top connection O RunddichtringO between top connection and pipe core, prevents from detecting Leakage Gas; Lower sub is threaded connection with lower rubber cylinder seat and is connected and fixed, and is provided with lower sub O RunddichtringO between lower sub and pipe core, prevents from detecting Leakage Gas; Enhancing ring connects top connection.
2. the detection method of the gas tightness testing tool that is threaded according to claim 1, is characterized in that:
The gas tightness testing tool that is threaded described in a, general is put into detected tubing and casing or subsurface tool, allows side opening place align with tubing and casing, subsurface tool box cupling;
B, detection gas are in straight channel is injected testing tool, and first side opening of flowing through, the second side opening, the 3rd side opening, the 4th side opening, detect gas and enter each confined space in testing tool;
C, along with detect gas flow through the first side opening, the 4th side opening, detect the confined space that gas constantly enters confined space, lower rubber cylinder and the lower rubber cylinder seat of packing element and upper glue tube base, upper and lower packing element is subject to detecting gas and constantly pushes and dilatational strain, finally complete and set, between testing tool and tubing and casing or subsurface tool, form annular sealed space;
D, on, after lower rubber cylinder completes and sets, increase the pressure that enters testing tool detection gas, high pressure detects gas flow through the first side opening, the 4th side opening, constantly add and press, lower rubber cylinder, make, lower rubber cylinder sets more reliable, high pressure detects gas flow through the second side opening, enter the annular sealed space between glue tube base fixed cover and the first retaining valve, the injection rate IR that detects gas along with high pressure constantly increases, this annular sealed space pressure constantly increases, promoting the first retaining valve moves downward, this annular sealed space is further increased, when O RunddichtringO on the first retaining valve is followed the first retaining valve while moving to venthole position, high pressure detects gas and will flow into the annular sealed space forming between testing tool and tubing and casing or subsurface tool by gap,
E, by the helium leak check instrument at tubing and casing, subsurface tool box cupling place, the gas outside tubing and casing, subsurface tool is detected, detect Leakage Gas value by measurement and judge tubing and casing, the subsurface tool gas tightness that is threaded;
F, detection finish, the high pressure that discharges into straight channel detects gas, the first retaining valve back pressure resets, the detection gas forming between testing tool and tubing and casing or subsurface tool in annular sealed space moves upward from return-air hole inflow promotion the second retaining valve, follow the second retaining valve while moving to the 3rd side opening position when O RunddichtringO under the second retaining valve, detect gas and discharge testing tool by direct current channel and reclaim outward;
When g, testing tool inside and outside differential pressure are down to upper and lower packing element solution seal pressure, upper and lower packing element back pressure resets, detect gas respectively from straight channel, annular space between testing tool and tubing and casing, subsurface tool is discharged, the second retaining valve back pressure resets, and final a whole set of testing tool returns to original state;
The gas tightness testing tool that is threaded described in h, general takes out in detected tubing and casing, subsurface tool, and qualified tubing and casing or subsurface tool are lowered in Oil/gas Well after testing, rectify and improve as defective.
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| CN201310103646.8A CN104075860B (en) | 2013-03-28 | 2013-03-28 | A kind of threaded pneumatic sealing test instrument and detection method |
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| CN201310103646.8A CN104075860B (en) | 2013-03-28 | 2013-03-28 | A kind of threaded pneumatic sealing test instrument and detection method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104963681A (en) * | 2015-07-09 | 2015-10-07 | 西南石油大学 | Oil and gas well pipe string thread sealing property detection equipment and method |
| CN106248318A (en) * | 2016-08-30 | 2016-12-21 | 重庆盛学科技有限公司 | Pipe connector air-leakage test assembly |
| CN104764566B (en) * | 2015-04-22 | 2017-07-28 | 西南石油大学 | A kind of external tubing and casing pneumatic sealing test device and detection method |
| CN114264424A (en) * | 2021-11-15 | 2022-04-01 | 江苏永鼎股份有限公司 | Sealing performance testing tool and method for preform sintering furnace |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764566B (en) * | 2015-04-22 | 2017-07-28 | 西南石油大学 | A kind of external tubing and casing pneumatic sealing test device and detection method |
| CN104963681A (en) * | 2015-07-09 | 2015-10-07 | 西南石油大学 | Oil and gas well pipe string thread sealing property detection equipment and method |
| CN104963681B (en) * | 2015-07-09 | 2017-10-10 | 西南石油大学 | Oil gas well casing string thread seal performance detection apparatus and method |
| CN106248318A (en) * | 2016-08-30 | 2016-12-21 | 重庆盛学科技有限公司 | Pipe connector air-leakage test assembly |
| CN114264424A (en) * | 2021-11-15 | 2022-04-01 | 江苏永鼎股份有限公司 | Sealing performance testing tool and method for preform sintering furnace |
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| Publication number | Publication date |
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| CN104075860B (en) | 2016-10-19 |
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