CN205259964U - Big effective high leakproofness screwed joint of expansion rate lower excess volume expansion - Google Patents
Big effective high leakproofness screwed joint of expansion rate lower excess volume expansion Download PDFInfo
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- CN205259964U CN205259964U CN201521018090.3U CN201521018090U CN205259964U CN 205259964 U CN205259964 U CN 205259964U CN 201521018090 U CN201521018090 U CN 201521018090U CN 205259964 U CN205259964 U CN 205259964U
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Abstract
The utility model discloses big effective high leakproofness screwed joint of expansion rate lower excess volume expansion adopts directly to link the type helicitic texture, and screwed joint includes expansion pipe box, expansion pipe pin thread, the expansion pipe box has inwards set gradually low tapering single hook type box thread, escape, cylinder seal section, one -level seal groove and/or second grade seal groove, conical surface seal section and negative angle degree moment of torsion circular bead by the tip, the expansion pipe pin thread has inwards set gradually negative angle degree moment of torsion circular bead, conical surface seal section, cylinder seal section, single hook type male thread by the tip, screwed joint adopts the multistage seal structure of binary channels, specifically is tertiary seal structure and inflation back second grade seal structure's before the inflation the sealed form of binary channels, the utility model discloses a screw deformation degree under single hook type screw tooth form and the big expansion rate of low tapering screw design reduction satisfies the high leakproofness ability after the deformation of the big expansion rate of screwed joint, easy processing measuring of while through the multistage seal structure of binary channels who optimizes after a large amount of calculation experiment.
Description
Technical field
The utility model coverage is that industrial gas oil brill completion flow string connecting thread structure is establishedMeter, particularly damages at cover the large expansion rate entity of one using in subsidy, formation shut-off and barefoot completion swollenThe nipple method for designing with high sealing ability for expand tube, to ensure the safe and effective exploitation of Oil/gas Well.
Background technology
Along with further going deep into of natural petroleum gas field, the more and more darker development difficulty of drilling depth is increasing,The many old fileds of China have entered the later stage of exploitation simultaneously, and cover damage problem is day by day serious, in order to solve actual surveyingVisit the difficulty running in development process, improve the speed of drilling, save drilling cost, solid expansion pipe skillArt has been introduced into bores in Completion Operations and has very excellent performance performance.
The general principle of solid expansion pipe technology is exactly by the position of subscribing to down-hole under steel pipe good a kind of plasticityPut, make the internal diameter of steel pipe expand required size to by cold working plastic deformation mode, cold deformation is to pass throughExpansion cone (external diameter of expansion cone is greater than the internal diameter of steel pipe) is passed swollen under the effect of hydraulic coupling and/or mechanical forceExpand tube makes tubing that permanent plastic deformation occur to reach and expand the object of caliber. Between solid expansion pipe, be to useScrew thread is twisted to connect and is connected to form tubing string, and therefore screw thread is the weakest link in expansion tube tubing string, its structural integrityProperty, sealing integrity and reliability, have a strong impact on safety in production and the tubing string life-span in oil field. Because entity is swollenExpand tube screw thread in use needs, through hole enlargement distortion, to need reach certain sealing and hold after distortionCarry performance, the sealing of double thread and the requirement of integrality are higher, common API screw thread and general sleeve pipe spyDifferent helicitic texture cannot satisfy the demands at all. There are in recent years some expansion tube helicitic textures, but mainFor be low thermal expansion (below 15%), sealing load is not high yet, cause cannot be in high dilatancy rate orSwollen rear sealing property is required to use under high operating mode, restricted greatly development and the application of bulged tube technology.The demand of bulged tube technology for current progress, particularly formation shut-off along with bulged tube technology and ocean is rightSealing and structural intergrity after the expansion rate of expansion tube and expansion propose requirements at the higher level, are badly in need of a kind of satisfiedThe expansion tube Special threading connector method for designing of high sealing performance under large expansion rate.
Utility model content
A kind of large expansion rate solid expansion pipe of the utility model with the nipple of high sealing ability be mainly forWhile meeting large expansion rate solid expansion pipe application, high leakproofness demand, adopts single hook type helical burr tooth form and low taperingDesign of Screw Thread reduces screw thread deformation extent under large expansion rate, many by the binary channels of optimizing after a large amount of calculating testsLevel hermetically-sealed construction meets after the distortion of the large expansion rate of nipple the high sealing performance of (expansion rate 10% ?35%),Be easy to processing detects simultaneously.
Technical solution of the present utility model is: under large expansion rate, solid expansion pipe connects with high leakproofness screw threadHead, adopts direct linkage type helicitic texture, and its special character is:
Described nipple comprises expansion tube box 1, expansion tube pin thread 2;
Expansion tube box 1 is inwardly disposed with low tapering list hook box thread 3, escape 5, post by endFace seal section 6, primary seal groove 7 and/or secondary seal groove 8, conical surface seal section 9 and negative angle moment of torsion platformShoulder 10; Expansion tube pin thread 2 by end be inwardly disposed with negative angle torque shoulder 10, conical surface seal section 9,Cylinder seal section 6, single hook male thread 4;
Described nipple adopts binary channels Multi-level sealing structure, and first three grade of hermetically-sealed construction and swollen specifically expandsThe binary channels seal form of swollen rear secondary seal structure;
First three grade of hermetically-sealed construction of described expansion comprises:
The cylinder seal section 6 of described expansion tube box 1 is expanding with the cylinder seal section 6 of expansion tube pin thread 2Front formation cylinder is to cylinder primary seal structure;
The conical surface seal section 9 of described expansion tube box 1 is expanding with the conical surface seal section 9 of expansion tube pin thread 2The front formation conical surface is to conical surface secondary seal structure;
The negative angle torque shoulder 10 of described expansion tube box 1 and the negative angle torque shoulder of expansion tube pin thread 210 match forms first three grade of auxiliary sealing structure that expand;
After described expansion, secondary seal structure comprises:
The primary seal groove 7 of described expansion tube box 1 and be arranged on the elastic packing in primary seal groove 7The cylinder seal section 6 of glue or easily weld metal and expansion tube pin thread 2 forms primary seal groove structure;
The secondary seal groove 8 of described expansion tube box 1 and be arranged on the uprising O type in secondary seal groove 8The conical surface seal section 9 of sealing ring and expansion tube pin thread 2 forms secondary seal groove structure;
Described primary seal groove 7 and secondary seal groove 8 are inwardly set gradually by end.
Above-mentioned expansion tube box 1 also comprises by end and inwardly sets gradually and be positioned at low tapering list hook box thread 3End shoulders 12, the end cylinder 11 in outside;
Expansion tube pin thread 2 also comprises the end that is inwardly set gradually and be positioned at single hook male thread 4 inner sides by endPortion's cylinder 11, end shoulders 12;
The end shoulders 12 of described expansion tube box 1, end cylinder 11 respectively with the end of expansion tube pin thread 2Shoulder 12, end cylinder 11 match.
In above-mentioned conical surface seal section 9, increase auxiliary seal cambered surface 7A, the primary seal of described expansion tube box 1Groove 7 and be arranged on elastic sealant in primary seal groove 7 or easily weld metal and expansion tube pin thread 2Auxiliary seal cambered surface 7A form primary seal groove structure.
The tapering of above-mentioned single hook box thread 3 and single hook male thread 4 is 1:18～1:30.
The tapering of above-mentioned single hook box thread 3 and single hook male thread 4 is 1:20.
The above-mentioned conical surface is to the conical surface seal section 9 of expansion tube box 1 in conical surface seal section and expansion tube pin thread 2Conical surface seal section 9 adopts identical or different tapering.
The tapering of the conical surface seal section 9 of the above-mentioned conical surface to expansion tube box 1 in conical surface seal section is 1:12;
The conical degree of conical surface of the conical surface seal section 9 of described expansion tube pin thread 2 is 1:16.
Above-mentioned single hook male thread 4 comprises external screw thread, and at the bottom of externally threaded crest 13 and externally threaded tooth, 15 is equalParallel with the bus of screw thread, externally threaded loading end 12 adopts negative angle structure, loading end 12 and tubing string axleThe normal angle of line is-3.5～-10 °, and externally threaded spigot surface 14 with the normal angle of tubing string axis is10～45 °; Described single hook box thread and single hook male thread match.
The negative angle of above-mentioned negative angle torque shoulder is 15 °; Described cylinder to the magnitude of interference of cylinder seal section is0.07mm; Described externally threaded loading end 12 is-9 ° with the normal angle of tubing string axis, externally threaded guidingFace 14 is 35 ° with the normal angle of tubing string axis.
The utility model advantage: by rational low tapering list hook type helical burr design, ensured that screw thread has enoughThickness keep intensity greatly to improve the degreeof tortuosity of screw thread in large expansion rate distortion simultaneously, improve screw threadBearing capacity and sealing, in sealing surface design, adopt binary channels Multi-level sealing structure, swollen by designingSwollen first three grade of hermetically-sealed construction and the rear secondary seal structure binary channels seal form that expands, meet nipple processRequirement to high leakproofness and high bearing capacity after large expansion rate distortion (expansion rate 10% ?35%), and closeSeal structure and sealability are unaffected in the time that expansion pipe column is received stretching and compressive load, have improved greatlyThe expansion rate of nipple and sealing property.
Simultaneously the conical surface to conical surface seal section in the pin end conical surface and the box end conical surface can adopt different taperings withControl interference point position and maximum seal contact pressure, improve the anti-stick button performance of screw thread, prevent from making because of damageThe thread seal becoming lost efficacy. Can after expansion, in secondary seal structure, can select any according to working condition requirementSeal groove or all second-order structure, flexible structure, is convenient to improve processing detection efficiency and reduce costs.
Brief description of the drawings
Fig. 1 (a), Fig. 1 (b) are the screw-thread joint structures of large expansion rate solid expansion pipe high sealing abilitySchematic diagram;
Fig. 2 is the utility model nipple dilatancy pre-structure schematic diagram;
Fig. 3 is the nipple seal groove structure schematic diagram after the utility model dilatancy;
Fig. 4 is the utility model nipple pin thread auxiliary seal globoidal structure schematic diagram;
Fig. 5 is form of thread structural representation;
Fig. 6 is the structural representation after button on the utility model nipple;
Fig. 7 be under embodiment mono-28% expansion rate O type rubber ring along the contact schematic diagram of cell wall;
Fig. 8 be under embodiment 2 20% expansion rates O type rubber ring along the contact schematic diagram of cell wall;
Detailed description of the invention
Fig. 1 is shown in by Special threading connector structural design schematic diagram of the present utility model, and nipple adopts direct linkage type spiral shellLine structure, wherein 1 is expansion tube box, 2 is expansion tube pin thread, on expansion tube box 1 and pin thread 2, dividesDo not process low tapering list hook box thread 3 and male thread 4, what be connected with single hook box thread 3 left sides is endCylinder 11 and end shoulders 12, for controlling position on the buckle; What be connected with single hook box thread 3 the right is to move backCutter groove 5, chaser withdrawing during for machining screw rises after button and stores unnecessary thread compound simultaneously on screw thread,Reduce the negative effect of thread compound pressure butt joint sealing property; What be connected with escape 5 is a pair of cylinder pairCylinder seal section 6, is designed with primary seal groove structure 7 at cylinder on to cylinder seal section 6, at cylinder coupled columnsWhat face seal section 6 the right were attached thereto is secondary seal groove structure 8, is one on secondary seal groove structure 8 the rightTo the conical surface, to conical surface seal section 9, what with the conical surface, conical surface seal section 9 is connected by a transition chamfering is negative angleDegree torque shoulder 10 has auxiliary seal effect for controlling position on the buckle simultaneously.
In the utility model, cylinder to cylinder seal section 6, the conical surface to conical surface seal section 9 and negative angle moment of torsionShoulder 10 composition first three grade of hermetically-sealed construction that expand, upper button rear pillar in the face of cylinder seal section 6 and the conical surface close to the conical surfaceEnvelope section 9 has higher sealing, sealing property in the time that nipple is subject to tensile load and higher interior pressureUnaffected, can meet that expansion tube when construction tubing string is transferred and initial pressure is set up, and due to reasonablyMagnitude of interference design can prevent that thread gluing from occurring, and negative angle torque shoulder 10 not only can be controlled torque wrench moment, withTime there are auxiliary three grades of sealing functions, reasonably negative angle design makes negative angle torque shoulder 10 in certain stretchingUnder load, still can keep auxiliary seal effect.
The conical surface described in the utility model can adopt not the pin end conical surface in conical surface seal section 9 and the box end conical surfaceSame tapering, to control interference point position and maximum seal contact pressure, improves the anti-stick button performance of screw thread, anti-The thread seal only causing because of damage lost efficacy.
Consider that the rear thread malformation of expanding under large expansion rate is larger, cylinder is to cylinder seal section 6, the conical surfaceAfter expansion, all be there is to moderate finite deformation generation seal failure in conical surface seal section 9 and negative angle torque shoulder 10,As shown in Figure 2, the utility model special design expand after secondary seal structure: primary seal groove structure 7With secondary seal groove structure 8, can ensure that by specialized designs these 2 kinds of seal groove structures are in large expansion rate distortionAfter still can holding structure completely there is not large change, as shown in Figure 3. Before expansion, at interior filling bulletProperty fluid sealant or easily weld metal as tin etc., at the uprising O RunddichtringO of secondary seal groove structure 8 interior installation,Elastic sealant in upper button process in primary seal groove structure 7 and pin thread cylinder seal section 6 reaction joinings,Or pin thread and primary seal groove structure 7 corresponding sites also surface apply easy weld metal as tin etc., at upper buttonMetal friction heat-dissipating in metal in process on pin thread and primary seal groove structure 7 produces metal solder, whenScrew thread is after excessive expansion rate distortion, due to still structural integrity of 2 kinds of seal grooves, in primary seal groove structure 7Inside there is elastic sealant sealing or metal solder, in secondary seal groove structure 8, have uprising O type closeThe high sealing pressure that seal produces, therefore after excessive dilatancy, in the secondary seal of 2 seal groovesLower this helicitic texture of effect still possesses high sealing ability.
Pin thread described in the utility model can be processed as auxiliary seal arc with primary seal groove structure 7 relative positionsFace 7A, as shown in Figure 4, can further improve sealing effectiveness.
Described in the utility model, can remove end cylinder 11 and end shoulders 12 does not affect the utility modelStructure and sealing effectiveness.
The groove of primary seal described in the utility model structure 7 and secondary seal groove structure 8 can be according to user demandsAll process or choose one of them and process.
Described in the utility model on Design of Screw Thread, adopt low tapered configuration, low tapering list hook box thread 3All much smaller than the tapering of API screw thread, tapering is 1:18～1:30 with the tapering of male thread 4, and this design is passableReduce significantly the wall thickness reduction that thread taper brings, improve the bearing capacity of helicitic texture, on tooth form, adoptWith the design of single hook type helical burr tooth form, as shown in Figure 5, at the bottom of externally threaded crest 13 and externally threaded tooth 15, allParallel with the bus of screw thread, externally threaded loading end 12 adopts negative angle structural design, loading end 12 and pipeThe normal angle of mast axis is-3.5～-10 °, and externally threaded spigot surface 14 with the normal angle of tubing string axis is10～45 °, this structure can be improved the degreeof tortuosity of screw thread in large expansion rate distortion greatly, improves screw threadBearing capacity and sealing.
Structural representation on the design's nipple after button is shown in Fig. 6.
Helicitic texture composition and dimensional requirement are referring to table 1;
Table 1
Concrete enforcement can be according to the requirement of concrete operating mode, selects the solid expansion pipe of different size to carry out screw-tjread systemStandby. The processing of employing Digit Control Machine Tool, adds man-hour, first uses rough turn blade processing end shoulders 12 and arranges spiral shellLine tapering, then uses finishing tool blade to process successively cylinder to cylinder seal section 6, primary seal groove structure 7,Secondary seal groove structure 8 and the conical surface are to conical surface seal section 9, and reprocessing negative angle torque shoulder 10, finally makesBy screw forming chasing tool machining screw, thread parameter is stung and checked to last hair down.
On screw thread, after button, use configuration tool that helicitic texture is expanded to 10%～35% along diametric(al), use hydraulic pressureWhether machine is suppressed and is detected threaded portion in expansion tube inside and leak, and uses cupping machine to being with this realityCarry out homogeneous tube tension test with the solid expansion pipe of novel described nipple, detect screw thread bearing capacity.
Embodiment mono-: 140mm × 8mm solid expansion pipe nipple of inflatable 28%
Adopt 140mm × 8mm solid expansion pipe body processing the utility model nipple, design parameter is in Table2, the interior filling elastic sealant sealing of primary seal groove structure 7, the in-built explosion-proof O type of secondary seal groove structure 8Rubber ring.
After processing, box phosphatization 10um is thick. When upper button, thread compound is evenly smeared at two ends, and factory's end adopts maximum to turn roundOn square, detain, on-the-spot end adopts in best torque to be detained. Embodiment mono-screw thread machined parameters is referring to table 2:
Table 2
The nipple of first-class button is carried out to the expansion operation of 28% expansion rate, secondary seal groove structure 8 after expandingInterior explosion-proof O type rubber ring is shown in Fig. 7 along the contact of cell wall.
Screw thread after expanding is carried out to the water pressure test, suppress 40MPa pressurize 30 minutes without pressure decreased, simultaneouslyTension test loads 1700kN axial load and does not reveal generation, and helicitic texture meets structural intergrity, highly denseThe requirement of envelope property.
Embodiment bis-: 245mm × 12mm solid expansion pipe nipple of inflatable 20%
Adopt 245mm × 12mm solid expansion pipe body processing the utility model nipple, design parameter is in Table2, in primary seal groove structure 7, position relative to primary seal groove structure 7 pin thread applies zinc alloy layer, twoThe in-built explosion-proof O type rubber ring of level seal groove structure 8.
After processing, box phosphatization 10um is thick. When upper button, thread compound is evenly smeared at two ends, and factory's end adopts maximum to turn roundOn square, detain, on-the-spot end adopts in best torque to be detained. Embodiment bis-screw thread machined parameters are referring to table 3:
Table 3
The nipple of first-class button is carried out to the expansion operation of 20% expansion rate, secondary seal groove structure 8 after expandingInterior explosion-proof O type rubber ring is shown in Fig. 8 along the contact of cell wall.
Screw thread after expanding is carried out to the water pressure test, suppress 35MPa pressurize 30 minutes without pressure decreased, simultaneouslyTension test loads 3234kN axial load and does not reveal generation, and helicitic texture meets structural intergrity, highly denseThe requirement of envelope property.
Claims (9)
1. solid expansion pipe high leakproofness nipple under large expansion rate, adopts direct linkage type helicitic texture, itsBe characterised in that:
Described nipple comprises expansion tube box (1), expansion tube pin thread (2);
Expansion tube box (1) is inwardly disposed with low tapering list hook box thread (3), escape by end(5), cylinder seal section (6), primary seal groove (7) and/or secondary seal groove (8), conical surface seal section (9)And negative angle torque shoulder (10); Expansion tube pin thread (2) is inwardly disposed with negative angle by end and turns roundSquare shoulder (10), conical surface seal section (9), cylinder seal section (6), single hook male thread (4);
Described nipple adopts binary channels Multi-level sealing structure, and first three grade of hermetically-sealed construction and swollen specifically expandsThe binary channels seal form of swollen rear secondary seal structure;
First three grade of hermetically-sealed construction of described expansion comprises:
The cylinder seal section (6) of described expansion tube box (1) and the cylinder seal section of expansion tube pin thread (2)(6) before expansion, form cylinder to cylinder primary seal structure;
The conical surface seal section (9) of described expansion tube box (1) and the conical surface seal section of expansion tube pin thread (2)(9) before expansion, form the conical surface to conical surface secondary seal structure;
The negative angle torque shoulder (10) of described expansion tube box (1) and the negative angle of expansion tube pin thread (2)Degree torque shoulder (10) matches and forms first three grade of auxiliary sealing structure that expand;
After described expansion, secondary seal structure comprises:
The primary seal groove (7) of described expansion tube box (1) and being arranged in primary seal groove (7)It is close that the cylinder seal section (6) of elastic sealant or easily weld metal and expansion tube pin thread (2) forms one-levelSealing groove structure;
The secondary seal groove (8) of described expansion tube box (1) and being arranged in secondary seal groove (8)The conical surface seal section (9) of uprising O RunddichtringO and expansion tube pin thread (2) forms secondary seal groove structure;
Described primary seal groove (7) and secondary seal groove (8) are inwardly set gradually by end.
2. solid expansion pipe high leakproofness nipple under large expansion rate according to claim 1, itsBe characterised in that:
Described expansion tube box (1) also comprises by end and inwardly sets gradually and be positioned at the female spiral shell of low tapering list hookEnd shoulders (12), the end cylinder (11) in line (3) outside;
Expansion tube pin thread (2) also comprises by end and inwardly sets gradually and be positioned at single hook male thread (4)The end cylinder (11) of side, end shoulders (12);
The end shoulders (12) of described expansion tube box (1), end cylinder (11) respectively with expansion tube public affairsEnd shoulders (12), the end cylinder (11) of button (2) match.
3. solid expansion pipe high leakproofness nipple under large expansion rate according to claim 1 and 2,It is characterized in that: described conical surface seal section (9) upper increase auxiliary seal cambered surface (7A), described expansion tube motherDetain the primary seal groove (7) of (1) and be arranged on the interior elastic sealant of primary seal groove (7) or easyThe auxiliary seal cambered surface (7A) of weld metal and expansion tube pin thread (2) forms primary seal groove structure.
4. solid expansion pipe high leakproofness nipple under large expansion rate according to claim 3, itsBe characterised in that: the tapering of described single hook box thread (3) and single hook male thread (4) is 1:18～1:30.
5. solid expansion pipe high leakproofness nipple under large expansion rate according to claim 4, itsBe characterised in that: the tapering of described single hook box thread (3) and single hook male thread (4) is 1:20.
6. solid expansion pipe high leakproofness nipple under large expansion rate according to claim 5, itsBe characterised in that: the described conical surface is to the conical surface seal section (9) of expansion tube box (1) in conical surface seal section and swollenThe conical surface seal section (9) of expand tube pin thread (2) adopts identical or different tapering.
7. solid expansion pipe high leakproofness nipple under large expansion rate according to claim 6, itsBe characterised in that: the cone of the conical surface seal section (9) of the described conical surface to expansion tube box (1) in conical surface seal sectionDegree is 1:12;
The conical degree of conical surface of the conical surface seal section (9) of described expansion tube pin thread (2) is 1:16.
8. solid expansion pipe high leakproofness nipple under large expansion rate according to claim 7, itsBe characterised in that: described single hook male thread (4) comprises external screw thread externally threaded crest (13) and external screw threadTooth at the bottom of (15) all parallel with the bus of screw thread, externally threaded loading end (12) adopts negative angle structure,Loading end (12) is-3.5～-10 ° with the normal angle of tubing string axis, externally threaded spigot surface (14) and pipeThe normal angle of mast axis is 10～45 °; Described single hook box thread and single hook male thread match.
9. solid expansion pipe high leakproofness nipple under large expansion rate according to claim 8, itsBe characterised in that: the negative angle of described negative angle torque shoulder is 15 °; The interference of described cylinder to cylinder seal sectionAmount is 0.07mm; Described externally threaded loading end (12) is-9 ° with the normal angle of tubing string axis, outer spiral shellThe spigot surface (14) of line is 35 ° with the normal angle of tubing string axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521018090.3U CN205259964U (en) | 2015-12-09 | 2015-12-09 | Big effective high leakproofness screwed joint of expansion rate lower excess volume expansion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521018090.3U CN205259964U (en) | 2015-12-09 | 2015-12-09 | Big effective high leakproofness screwed joint of expansion rate lower excess volume expansion |
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| Publication Number | Publication Date |
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| CN205259964U true CN205259964U (en) | 2016-05-25 |
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|---|---|---|---|
| CN201521018090.3U Withdrawn - After Issue CN205259964U (en) | 2015-12-09 | 2015-12-09 | Big effective high leakproofness screwed joint of expansion rate lower excess volume expansion |
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| CN (1) | CN205259964U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422018A (en) * | 2015-12-09 | 2016-03-23 | 中国石油集团石油管工程技术研究院 | High-leakproofness threaded connector for solid expansion pipe in large expansion rate |
| CN106382099A (en) * | 2016-11-15 | 2017-02-08 | 东营威玛石油钻具有限公司 | Threaded connection structure of air sealing oil casing |
-
2015
- 2015-12-09 CN CN201521018090.3U patent/CN205259964U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105422018A (en) * | 2015-12-09 | 2016-03-23 | 中国石油集团石油管工程技术研究院 | High-leakproofness threaded connector for solid expansion pipe in large expansion rate |
| CN106382099A (en) * | 2016-11-15 | 2017-02-08 | 东营威玛石油钻具有限公司 | Threaded connection structure of air sealing oil casing |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160525 Effective date of abandoning: 20171215 |
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| AV01 | Patent right actively abandoned |