CN102829269B - Special screwed joint for gas injection and production of underground gas storage - Google Patents
Special screwed joint for gas injection and production of underground gas storage Download PDFInfo
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- CN102829269B CN102829269B CN201210316578.9A CN201210316578A CN102829269B CN 102829269 B CN102829269 B CN 102829269B CN 201210316578 A CN201210316578 A CN 201210316578A CN 102829269 B CN102829269 B CN 102829269B
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Abstract
The invention discloses a special screwed joint for gas injection and production of an underground gas storage, which belongs to the field of natural gas storage and transportation. The special screwed joint comprises an external screwed joint and an internal screwed joint which are assembled together, wherein the assembling parts of the special screwed joint are thread meshing sections and a main sealing section, and the thread meshing section is connected with the main sealing section; the threads of the thread meshing sections of both the external screwed joint and the internal screwed joint are hooked deep toothed threads; and the main sealing section is a multi-seal, and comprises two groups of conical surfaces/conical surface seals, a group of cylindrical surfaces/cylindrical surface seals and a group of cylindrical surfaces/spherical surface seals. With the special screwed joint, the sealing capability of the screwed joint which bears stretching, compressing and bending loads can be improved, and the safety and reliability of the screwed joint during the gas injection and production operations of the underground gas storage are enhanced.
Description
Technical field
The present invention relates to rock gas accumulating field, particularly the gas injection of a kind of underground natural gas storage tank and gas production Special threading connector.
Background technique
Underground natural gas storage tank can regulate the seasonal gas peak-valley difference of using, or guarantee at the time of emergency the continuity of air feed, and at present, more than 600 of built underground natural gas storage tank, countries and regions, 35, the whole world, build up more than 20,000 mouthful of gas storage well, development and the use of various countries to underground natural gas storage tank paid much attention to.
Underground natural gas storage tank is in operation, note gas production is periodically alternately frequent, gas two-way flow in tubing string and between stratum, tubing string will bear complex load, note is adopted in process gas to tubing string effect inner pressuring load, the temperature difference on gas and stratum causes tubing string to want bearing temperature load, and the variation that note is adopted strata pressure in process can make tubing string bear axial tension, compression or flexural load, and axial compression loading is larger than tension load, because inipple is weak link, so quality of inipple sealability and be reliably whether to determine that underground natural gas storage tank note adopts the key that can operation be carried out safely.
For common API round thread or buttress thread joint, all load all need be by threads carry, under axial tension load, easily there is slippage in round thread, buttress thread is poor sealing performance, so common API inipple cannot meet the requirement of underground natural gas storage tank gas injection and gas production.
Summary of the invention
In order to solve the problem of prior art, the embodiment of the present invention provides the gas injection of a kind of underground natural gas storage tank and gas production Special threading connector, this Special threading connector can reach and improve the sealability of inipple in the time bearing stretching, compression and flexural load, strengthens the object of the safety reliability of inipple in underground natural gas storage tank gas injection and gas production operation.Described technological scheme is as follows:
A kind of underground natural gas storage tank gas injection and gas production Special threading connector, described Special threading connector comprises the male connection and the female adapter that are assembled together, the assembling position of described Special threading connector is divided into thread engagement section and primary seal section, and described thread engagement section is connected with described primary seal section;
Screw thread in described male connection and described female adapter in described thread engagement section is the dark tooth thread of hook-type;
Described primary seal section is multi-sealed, comprises the two groups of conical surface/conical surface seals, the sealing of one group of cylinder/cylinder and one group of cylinder/ball face sealing.
Particularly, as preferably, the described two groups of conical surface/conical surface seals comprise the conical surface/conical surface seal I and the conical surface/conical surface seal II, described primary seal section comprises the described conical surface/conical surface seal I, described cylinder/ball face sealing, the sealing of described cylinder/cylinder and the described conical surface/conical surface seal II in turn, and the described conical surface/conical surface seal II is connected with described thread engagement section.
Particularly, as preferably, the described two groups of conical surface/conical surface seals respectively comprise a pair of sealing surface, and two groups of sealing surfaces parallel, and described two groups of sealing surfaces form angle theta 3 with the plane perpendicular to inipple center line respectively, and θ 3=58 °～65 °.
Particularly, as preferably, described male connection comprises in turn connected outside thread shoulder, male connection primary seal section and external thread section;
Described male connection primary seal section comprises in turn connected outside thread conical surface seal I, external thread sleeve cylinder and outside thread conical surface seal II;
Described external thread section comprises outside thread and outside thread disappearance portion;
Wherein, described outside thread conical surface seal I is connected by circular arc with described outside thread shoulder, and described outside thread conical surface seal II is connected with described outside thread disappearance portion.
Particularly, as preferably, described radius of arc is 0.2mm～0.35mm.
Particularly, as preferably, described female adapter comprises in turn connected internal thread shoulder, female adapter primary seal section and internal thread segment;
Described female adapter primary seal section comprises internal thread conical surface seal I, cylinder I, sphere, cylinder I, cylinder, cylinder I and internal thread conical surface seal II in turn;
Described internal thread segment comprises internal thread, tool withdrawal groove and concave section;
Wherein, described internal thread conical surface seal I is connected with described internal thread shoulder, and described internal thread conical surface seal II one end is connected with described concave section.
Particularly, as preferably, respectively and in described female adapter, between each cylinder I, form annular space separately, annular space spacing is separately 1.5～2mm to described external thread sleeve cylinder.
Particularly, as preferably, described outside thread shoulder is parallel with described internal thread shoulder, and described outside thread shoulder and described internal thread shoulder are negative angle shoulder, the circular bead surface of described outside thread shoulder and internal thread shoulder forms angle theta 4, θ 4=18 °～23 ° with the plane perpendicular to inipple center line respectively.
Particularly, as preferably, after on described Special threading connector, button is tightened, the sealed increscence amount of the described conical surface/conical surface seal I is larger than the sealed increscence amount of the described conical surface/conical surface seal II.
Particularly, as preferably, the sealed increscence amount of described cylinder/ball face sealing is larger than the sealed increscence amount of described cylinder/cylinder sealing.
Particularly, as preferably, L1 is larger than outside thread spacewidth L2 for the upper outside screw thread facewidth of the dark tooth thread middle line of described hook-type, and internal thread facewidth L4 is less than internal thread spacewidth L3, wherein, outside thread facewidth L1=3.375mm, outside thread teeth groove L2=2.975mm, internal thread spacewidth L3=3.4mm, internal thread facewidth L4=2.95mm.
Particularly, as preferably, the dark tooth thread tapering of described hook-type is 1:18.
Particularly, as preferably, high equating at the bottom of the dark tooth thread addendum of described hook-type and tooth,, the dark tooth thread tooth depth of hook-type is than the large 0.1mm～0.2mm of API buttress thread tooth depth.
Particularly, as preferably, the screw thread tooth top guiding side fillet radius R1=0.5mm of the dark tooth thread of described hook-type China and foreign countries, guiding side fillet radius R2=0.3mm at the bottom of internal thread tooth in the dark tooth thread of described hook-type, in addition, in the dark tooth thread of described hook-type, other threaded circular angular radius is identical with API buttress thread fillet radius.
Particularly, as preferably, 1=6 °～7.5 ° of the dark tooth thread angle of deflection of described hook-type θ, angle θ 2=2 °～3.5 ° of the dark tooth thread carryings of described hook-type.
The beneficial effect that the technological scheme that the embodiment of the present invention provides is brought is:
Compared to existing technology, the invention provides the gas injection of a kind of underground natural gas storage tank and gas production Special threading connector, adopt multi-sealed sealability and the sealing reliability that improves primary seal, the two groups of conical surface/conical surface seals can provide large sealing area, and can bear certain moment of torsion, the sealing of cylinder/cylinder and cylinder/ball face sealing can guarantee that the sealability of inipple in the time bearing tensile and compress is constant, cylinder/ball face sealing also can guarantee the sealability of inipple in the time bending, the excessive contact that the co-design of the sealing of cylinder/cylinder and cylinder/ball face sealing has avoided sphere to be subject to, the weakness of single sealing had both been avoided in the employing of multi-sealed form, give full play to again the advantage of each seal form, the more important thing is the sealing reliability that has greatly strengthened inipple, guarantee the safety reliability in underground natural gas storage tank gas injection and gas production operation process.
In addition, with the comparison of existing API standard buttress thread, the dark tooth thread of hook-type the present invention relates to has that tapering is little, pitch is large, tooth depth is large, the facewidth and the feature such as teeth groove is roomy, angle of deflection is little, therefore screw thread of the present invention has better sealability, can bear larger tensile and compress load.
Therefore, the present invention can improve the sealability of inipple in the time bearing stretching, compression and flexural load, strengthens the safety reliability of inipple in underground natural gas storage tank gas injection and gas production operation.
Accompanying drawing explanation
In order to be illustrated more clearly in the technological scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is that underground natural gas storage tank gas injection and the gas production Special threading connector that the embodiment of the present invention provides assembles schematic diagram;
Fig. 2 is Special threading connector shoulder and primary seal place assembling enlarged diagram described in the embodiment of the present invention;
Fig. 3 is male connection shoulder and primary seal place enlarged diagram described in the embodiment of the present invention;
Fig. 4 is female adapter shoulder and primary seal place enlarged diagram described in the embodiment of the present invention;
Fig. 5 is outside thread size schematic diagram described in the embodiment of the present invention;
Fig. 6 is dimension of inner screw thread schematic diagram described in the embodiment of the present invention.
In figure, each symbol represents that implication is as follows:
1-female adapter; 202-outside thread conical surface seal I;
2-male connection; 30 203-outside thread conical surface seal II;
Crassitude intermediate belt in 3-; T1-external thread sleeve body wall thickness;
4-shoulder; Thickened pipe end wall thickness in t2-external thread sleeve;
The 5-conical surface/conical surface seal I; θ 1-angle of deflection;
6-external thread sleeve cylinder; θ 2-carries angle;
7-cylinder/ball face sealing; 35 θ 3-sealing surfaces with perpendicular to inipple center
The sealing of 8-cylinder/cylinder; The plane included angle of line;
The 9-conical surface/conical surface seal II; θ 4-circular bead surface with perpendicular to inipple center
10-circular arc; The plane included angle of line;
11-outside thread; H-tooth depth;
12-cylinder I; 40 H1-addendum;
13-tool withdrawal groove; High at the bottom of H2-tooth;
14-internal thread; The L1-outside thread facewidth;
15-concave section; L2-outside thread spacewidth;
16-middle line; L3-internal thread spacewidth;
101-internal thread shoulder; The 45 L4-internal thread facewidth;
102-internal thread conical surface seal I; P-pitch;
103-internal thread conical surface seal II; R1-outside thread tooth top guiding side fillet radius;
104-sphere; Guiding side fillet radius at the bottom of R2-internal thread tooth;
105-cylinder; A district-thread engagement section;
201-outside thread shoulder; 50 B district-primary seal sections.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
As shown in Figure 1, a kind of underground natural gas storage tank gas injection that the embodiment of the present invention provides and gas production Special threading connector, described Special threading connector comprises the male connection 2 and the female adapter 1 that are assembled together, the assembling position of described Special threading connector is divided into thread engagement section A district and primary seal section B district, and described thread engagement section A district is connected with described primary seal section B district;
Screw thread in described male connection 2 and described female adapter 1 in described thread engagement section A district is the dark tooth thread of hook-type;
As shown in Figure 2, described primary seal section B district is multi-sealed, comprises the two groups of conical surface/conical surface seals, the sealing 8 of one group of cylinder/cylinder and one group of cylinder/ball face sealing 7.
The present invention adopts multi-sealed sealability and the sealing reliability that improves primary seal, the two groups of conical surface/conical surface seals can provide large sealing area, and can bear certain moment of torsion, the sealing 8 of cylinder/cylinder and cylinder/ball face sealing 7 can guarantee that the sealability of inipple in the time bearing tensile and compress is constant, cylinder/ball face sealing 7 also can guarantee the sealability of inipple in the time bending, the excessive contact that the co-design of the sealing 8 of cylinder/cylinder and cylinder/ball face sealing 7 has avoided sphere to be subject to, the weakness of single sealing had both been avoided in the employing of multi-sealed form, give full play to again the advantage of each seal form, the more important thing is the sealing reliability that has greatly strengthened inipple, guarantee the safety reliability in underground natural gas storage tank gas injection and gas production operation process.
In addition, with the comparison of existing API standard buttress thread, the dark tooth thread of hook-type the present invention relates to has that tapering is little, pitch is large, tooth depth is large, the facewidth and the feature such as teeth groove is roomy, angle of deflection is little, therefore screw thread of the present invention has better sealability, can bear larger tensile and compress load.
Therefore, the present invention can improve the sealability of inipple in the time bearing stretching, compression and flexural load, strengthens the safety reliability of inipple in underground natural gas storage tank gas injection and gas production operation.
Particularly, as preferably, as shown in Figure 2, in the present embodiment, the two groups of described conical surface/conical surface seals comprise the conical surface/conical surface seal I5 and the conical surface/conical surface seal II9, described primary seal section B district comprises the described conical surface/conical surface seal I5, described cylinder/ball face sealing 7, the sealing 8 of described cylinder/cylinder and the described conical surface/conical surface seal II9 in turn, and the described conical surface/conical surface seal II9 is connected with described thread engagement section A district.Adopt non-deformability and the sealability of multi-sealed rear thread joint greatly to improve, the two groups of conical surface/conical surface seals can be born larger moment of torsion, the sealing 8 of cylinder/cylinder and cylinder/ball face sealing 7 have guaranteed that the sealability of inipple in the time bearing tensile and compress is constant, cylinder/ball face sealing 7 has guaranteed the sealability of inipple in the time bending, the excessive contact that the co-design of the sealing 8 of cylinder/cylinder and cylinder/ball face sealing 7 has also avoided sphere to be subject to.
Particularly, as preferably, the described two groups of conical surface/conical surface seals 5,9 respectively comprise a pair of sealing surface, and two groups of sealing surfaces parallel, described two groups of sealing surfaces form angle theta 3(referring to Fig. 3 with the plane perpendicular to inipple center line respectively), and θ 3=58 °～65 °.Two groups of sealing surfaces parallel and can make inipple to make the active force shared on used time two groups of sealing surfaces more even being subject to axial compression or high pulling torque, adopt 3 jiaos of larger θ to be conducive to inipple two displacements to axial to sealing surface in the time being subject to Axial Loads, be conducive to like this reduce the contact of inipple from axial tension to axial compression process or from axial compression to axial tension process and change, guaranteed the sealing stability of two groups of sealing surfaces.Particularly, as preferably, as shown in Figure 3, in the present embodiment, described male connection 2 comprises in turn connected outside thread shoulder 201, male connection primary seal section and external thread section;
Described male connection primary seal section comprises in turn connected outside thread conical surface seal I202, external thread sleeve cylinder 6 and outside thread conical surface seal II203;
Described external thread section comprises outside thread 11 and outside thread disappearance portion;
Wherein, described outside thread conical surface seal I202 is connected by circular arc 10 with described outside thread shoulder 201, and described outside thread conical surface seal II203 is connected with described outside thread disappearance portion.
Be: described outside thread conical surface seal I202 one end is connected by circular arc 10 with outside thread shoulder 201, the other end is connected with external thread sleeve cylinder 6, outside thread conical surface seal II 203 one end are connected with external thread sleeve cylinder 6, and the other end extends outside thread disappearance position.Traditional tube end plane shoulder is decomposed into the combination of plane shoulder 201 and conical surface seal I202, in guaranteeing torque resistant, sealability is strengthened, and the stress of tube end improves simultaneously.Particularly, as preferably, described circular arc 10 radiuses are 0.2mm～0.35mm.The generation of local concentrated stress and distortion can avoid outside thread shoulder 201 and outside thread conical surface seal I202 to coordinate with internal thread shoulder 101 and internal thread conical surface seal I102 respectively by Machining Arc 10 time.
Particularly, as preferably, as shown in Figure 4, in the present embodiment, described female adapter 1 comprises in turn connected internal thread shoulder 101, female adapter primary seal section and internal thread segment;
Described female adapter primary seal section comprises internal thread conical surface seal I102, cylinder I12, sphere 104, cylinder I, cylinder 105, cylinder I and internal thread conical surface seal II103 in turn;
Described internal thread segment comprises internal thread 14, tool withdrawal groove 13 and concave section 15;
Wherein, described internal thread conical surface seal I102 is connected with described internal thread shoulder 101, and described internal thread conical surface seal II103 one end is connected with described concave section 15.
Be: described internal thread conical surface seal I102 one end is connected with internal thread shoulder 101, and the other end is connected with cylinder I12, and internal thread conical surface seal II103 one end is connected with cylinder I12, and the other end extends concave section 15.Adopt multi-sealed and uniform along axial direction, various seal form are fully used.
Particularly, as preferably, as shown in Figure 2, respectively and in described female adapter 1, between each cylinder I12, form annular space separately, annular space spacing is separately 1.5～2mm to described external thread sleeve cylinder 6.Annular space can store thread compound, is conducive to lubricated and sealing.
Particularly, as preferably, as shown in Figure 2, in the present embodiment, described outside thread shoulder 201 is parallel with described internal thread shoulder 101, and described outside thread shoulder 201 and described internal thread shoulder 101 are negative angle shoulder, the circular bead surface of described outside thread shoulder 201 and internal thread shoulder 101 forms angle theta 4, θ 4=18 °～23 ° with the plane perpendicular to inipple center line respectively.Large negative angle shoulder described outside thread shoulder 201 and described internal thread shoulder 101 under tension load effect can keep in touch always, can play certain seal action.
Particularly, as preferably, as shown in Figure 2, in the present embodiment, after on described Special threading connector, button is tightened, the sealed increscence amount of the described conical surface/conical surface seal I5 is larger than the sealed increscence amount of the described conical surface/conical surface seal II9.The sealed increscence amount of the conical surface/conical surface seal I5 is large, its sealing surface contact is also large, if the conical surface/conical surface seal I5 lost efficacy at large axial compression loading effect lower seal, the conical surface/conical surface seal II9 still can play good seal action, and this kind of different the arranging of sealed increscence amount strengthened the sealing reliability of inipple.
Particularly, as preferably, as shown in Figure 2, in the present embodiment, the sealed increscence amount of described cylinder/ball face sealing 7 is larger than the sealed increscence amount of described cylinder/cylinder sealing 8.Cylinder/ball face sealing 7 lays particular emphasis on sealing and guiding, and cylinder/cylinder sealing 8 can be shared a part of radial pressure, alleviates the radially contact of cylinder/ball face sealing 7, avoids sphere to sustain damage.Different sealed increscence amounts is set, and the effect of the sealing of two kinds of forms finds full expression.
Particularly, as preferably, as shown in Figure 1, in the present embodiment, described external thread sleeve pipe end has carried out interior thickening; In external thread sleeve, thickened pipe end wall thickness t2 is greater than external thread sleeve body wall thickness t1, and they are through interior crassitude intermediate belt 3 transition.Particularly, as preferably, as shown in Figure 1, described female adapter 1 grade of steel is higher than described male connection 2 grade of steels, i.e. female adapter 1 yield strength ratio male connection 2 yield strengths are large.
The embodiment of the present invention adopts female adapter 1 yield strength ratio male connection 2 yield strengths large, and external thread sleeve pipe end is carried out to interior process for upsetting, the ability that this has strengthened the weak pipe end resistance to deformation of relative thin, has strengthened the sealability of inipple in essence.
Particularly, as preferably, as shown in Figure 5, L1 is larger than outside thread spacewidth L2 for the upper outside screw thread facewidth of the dark tooth thread middle line 16 of described hook-type, as shown in Figure 6, and internal thread facewidth L4 is less than internal thread spacewidth L3, wherein, as shown in Figure 5, outside thread facewidth L1=3.375mm, outside thread teeth groove L2=2.975mm, as shown in Figure 6, internal thread spacewidth L3=3.4mm, internal thread facewidth L4=2.95mm.Because relative female adapter 1 grade of steel of male connection 2 is low and stressed complexity, increase outside thread facewidth L1 has strengthened the ability of outside thread resistance to deformation, more harmonious while making internal and external threads stressed.
More specifically, in the present embodiment, as shown in Figures 5 and 6, the dark tooth thread of described hook-type is one inch of 4 pitch thread, and pitch P is 6.35mm.Pitch increases, the corresponding increase of the facewidth, the corresponding enhancing of ability of worm tooth resistance to deformation.
Particularly, as preferably, as shown in Figures 5 and 6, in the present embodiment, the dark tooth thread tapering of described hook-type is 1:18.The tapering of API buttress thread is 1:16, reduces tapering, the anti-slip intensity enhancing after internal and external threads engagement, and in addition, pipe end incomplete thread length increases, and the increase of thread engagement length has strengthened the ability of inipple resistance to deformation.
Particularly, as preferably, as shown in Figures 5 and 6, in the present embodiment, at the bottom of described hook-type dark tooth thread addendum H1 and tooth, high H2 equates, the dark tooth thread tooth depth of hook-type H is than the large 0.1mm～0.2mm of API buttress thread tooth depth.Tooth depth increases, and the area of contact after thread engagement increases, and the sealability of inipple strengthens on the one hand, and the ability of inipple resistance to deformation also strengthens on the other hand.
Particularly, as preferably, as shown in Figures 5 and 6, in the present embodiment, the screw thread tooth top guiding side fillet radius R1=0.5mm of the dark tooth thread of described hook-type China and foreign countries, guiding side fillet radius R2=0.3mm at the bottom of internal thread tooth in the dark tooth thread of described hook-type, in addition, in the dark tooth thread of described hook-type, other threaded circular angular radius is identical with API buttress thread fillet radius.At the bottom of the partially trapezoidal outside thread tooth top guiding side fillet radius of API and internal thread tooth, guiding side fillet radius is 0.76mm, reduce both values and be conducive to strengthen the sealability after thread engagement, in addition outside thread tooth top guiding side fillet radius than internal thread tooth at the bottom of guiding side fillet radius can avoid greatly in button process, thread gluing occurring on screw thread.
In the present embodiment, outside thread tooth top guiding side fillet radius diminishes, and the gap that this has reduced the side fillet place of leading after thread engagement has strengthened the sealability of screw thread.Therefore, screw thread of the present invention has better sealability, can bear larger tensile and compress load.
Particularly, as preferably, as shown in Figures 5 and 6, and in the present embodiment, 1=6 °～7.5 ° of the dark tooth thread angle of deflection of described hook-type θ, angle θ 2=2 °～3.5 ° of the dark tooth thread carryings of described hook-type.API buttress thread angle of deflection is 10 °, reduces angle of deflection and can strengthen the ability of screw thread opposing axial compression, adopts negative angle carrying angle can strengthen the ability of screw thread opposing axial tension.
Underground natural gas storage tank of the present invention gas injection and gas production Special threading connector, be also applicable to the high sealing Special threading connector under the complex load environment such as high temperature, high pressure, compression, stretching, bending.
The invention described above embodiment's sequence number, just to describing, does not represent embodiment's quality.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. a underground natural gas storage tank gas injection and gas production Special threading connector, it is characterized in that, described Special threading connector comprises the male connection and the female adapter that are assembled together, the assembling position of described Special threading connector is divided into thread engagement section and primary seal section, and described thread engagement section is connected with described primary seal section;
Screw thread in described male connection and described female adapter in described thread engagement section is the dark tooth thread of hook-type;
Described primary seal section is multi-sealed, comprises the two groups of conical surface/conical surface seals, the sealing of one group of cylinder/cylinder and one group of cylinder/ball face sealing;
The two groups of described conical surface/conical surface seals comprise the conical surface/conical surface seal I and the conical surface/conical surface seal II, described primary seal section comprises the described conical surface/conical surface seal I, described cylinder/ball face sealing, the sealing of described cylinder/cylinder and the described conical surface/conical surface seal II in turn, and the described conical surface/conical surface seal II is connected with described thread engagement section;
Described male connection comprises in turn connected outside thread shoulder, male connection primary seal section and external thread section;
Described male connection primary seal section comprises in turn connected outside thread conical surface seal I, external thread sleeve cylinder and outside thread conical surface seal II;
Described external thread section comprises outside thread and outside thread disappearance portion;
Wherein, described outside thread conical surface seal I is connected by circular arc with described outside thread shoulder, and described outside thread conical surface seal II is connected with described outside thread disappearance portion.
2. Special threading connector according to claim 1, it is characterized in that, the described two groups of conical surface/conical surface seals respectively comprise a pair of sealing surface, and two groups of sealing surfaces parallel, described two groups of sealing surfaces form angle theta 3 with the plane perpendicular to inipple center line respectively, and θ 3=58 °～65 °.
3. Special threading connector according to claim 1, is characterized in that, described radius of arc is 0.2mm～0.35mm.
4. Special threading connector according to claim 1, is characterized in that, described female adapter comprises in turn connected internal thread shoulder, female adapter primary seal section and internal thread segment;
Described female adapter primary seal section comprises internal thread conical surface seal I, cylinder I, sphere, cylinder I, cylinder, cylinder I and internal thread conical surface seal II in turn;
Described internal thread segment comprises internal thread, tool withdrawal groove and concave section;
Wherein, described internal thread conical surface seal I is connected with described internal thread shoulder, and described internal thread conical surface seal II one end is connected with described concave section.
5. Special threading connector according to claim 4, is characterized in that, described external thread sleeve cylinder forms annular space separately respectively and in described female adapter between each cylinder I, and annular space spacing is separately 1.5～2mm.
6. Special threading connector according to claim 4, it is characterized in that, described outside thread shoulder is parallel with described internal thread shoulder, and described outside thread shoulder and described internal thread shoulder are negative angle shoulder, the circular bead surface of described outside thread shoulder and internal thread shoulder forms angle theta 4, θ 4=18 °～23 ° with the plane perpendicular to inipple center line respectively.
7. Special threading connector according to claim 1, is characterized in that, after on described Special threading connector, button is tightened, the sealed increscence amount of the described conical surface/conical surface seal I is larger than the sealed increscence amount of the described conical surface/conical surface seal II.
8. Special threading connector according to claim 1, is characterized in that, the sealed increscence amount of described cylinder/ball face sealing is larger than the sealed increscence amount of described cylinder/cylinder sealing.
9. Special threading connector according to claim 1, it is characterized in that, L1 is larger than outside thread spacewidth L2 for the upper outside screw thread facewidth of the dark tooth thread middle line of described hook-type, and internal thread facewidth L4 is less than internal thread spacewidth L3, wherein, outside thread facewidth L1=3.375mm, outside thread teeth groove L2=2.975mm, internal thread spacewidth L3=3.4mm, internal thread facewidth L4=2.95mm.
10. Special threading connector according to claim 1, is characterized in that, the dark tooth thread tapering of described hook-type is 1:18.
11. Special threading connectors according to claim 1, is characterized in that, high equating at the bottom of the dark tooth thread addendum of described hook-type and tooth, the dark tooth thread tooth depth of hook-type is than the large 0.1mm～0.2mm of API buttress thread tooth depth.
12. Special threading connectors according to claim 1, it is characterized in that, the screw thread tooth top guiding side fillet radius R1=0.5mm of the dark tooth thread of described hook-type China and foreign countries, guiding side fillet radius R2=0.3mm at the bottom of internal thread tooth in the dark tooth thread of described hook-type, in addition, in the dark tooth thread of described hook-type, other threaded circular angular radius is identical with API buttress thread fillet radius.
13. according to the Special threading connector described in claim 1-12 any one claim, it is characterized in that 1=6 °～7.5 ° of the dark tooth thread angle of deflection of described hook-type θ, angle θ 2=2 °～3.5 ° of the dark tooth thread carryings of described hook-type.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210316578.9A CN102829269B (en) | 2012-08-30 | 2012-08-30 | Special screwed joint for gas injection and production of underground gas storage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210316578.9A CN102829269B (en) | 2012-08-30 | 2012-08-30 | Special screwed joint for gas injection and production of underground gas storage |
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| Publication Number | Publication Date |
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| CN102829269A CN102829269A (en) | 2012-12-19 |
| CN102829269B true CN102829269B (en) | 2014-06-04 |
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| CN201210316578.9A Active CN102829269B (en) | 2012-08-30 | 2012-08-30 | Special screwed joint for gas injection and production of underground gas storage |
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|---|---|---|---|---|
| CN1041645A (en) * | 1988-10-03 | 1990-04-25 | 达尔米尼公司 | Hermetic metal pipe joint |
| CN2238957Y (en) * | 1995-12-27 | 1996-10-30 | 马巍 | Easy dismounted pipe joint |
| CN101063502A (en) * | 2006-04-29 | 2007-10-31 | 天津钢管集团有限公司 | Anticompress and anti-bending shouldered hook-shape teeth screwed connection structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2868146B1 (en) * | 2004-03-26 | 2009-01-23 | Vallourec Mannesmann Oil Gas F | TUBULAR THREAD RESISTANT TO FLEXION CONSTRAINTS |
-
2012
- 2012-08-30 CN CN201210316578.9A patent/CN102829269B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041645A (en) * | 1988-10-03 | 1990-04-25 | 达尔米尼公司 | Hermetic metal pipe joint |
| CN2238957Y (en) * | 1995-12-27 | 1996-10-30 | 马巍 | Easy dismounted pipe joint |
| CN101063502A (en) * | 2006-04-29 | 2007-10-31 | 天津钢管集团有限公司 | Anticompress and anti-bending shouldered hook-shape teeth screwed connection structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102829269A (en) | 2012-12-19 |
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