CN203847015U - Lining tubing coupling - Google Patents

Lining tubing coupling Download PDF

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Publication number
CN203847015U
CN203847015U CN201420257878.9U CN201420257878U CN203847015U CN 203847015 U CN203847015 U CN 203847015U CN 201420257878 U CN201420257878 U CN 201420257878U CN 203847015 U CN203847015 U CN 203847015U
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CN
China
Prior art keywords
bushing ring
escape
tooth
tubing coupling
coupling
Prior art date
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Active
Application number
CN201420257878.9U
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Chinese (zh)
Inventor
杨争
石建设
石易蕾
纪艳娟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Petroleum and Chemical Corp
Sinopec Jiangsu Oilfield Co
Original Assignee
China Petroleum and Chemical Corp
Sinopec Jiangsu Oilfield Co
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Publication date
Application filed by China Petroleum and Chemical Corp, Sinopec Jiangsu Oilfield Co filed Critical China Petroleum and Chemical Corp
Priority to CN201420257878.9U priority Critical patent/CN203847015U/en
Application granted granted Critical
Publication of CN203847015U publication Critical patent/CN203847015U/en
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Abstract

The utility model relates to the field of oil field mechanical oil extraction, in particular to a lining tubing coupling used for connecting oil tubes. The lining tubing coupling comprises a coupling body. The two ends inside the coupling body are provided with internal threads respectively, wherein the internal threads are used for connecting the oil tubes. The tail end, corresponding to the two internal threads, of the middle of the inner wall of the coupling body is provided with a tool withdrawal groove. A lining ring is clamped into the tool withdrawal groove in a matched mode. An inward convex face is arranged in the axial middle of the inner wall of the lining ring, wherein the inner diameter of the inward convex face is equal to that of the oil tubes to be connected. The two sides of the inward convex face are respectively and sequentially provided with a conical surface and an occlusal surface. The conical surfaces are matched with chamfers of the end faces of the oil tubes, and the occlusal surfaces are screwed with screw threads, extending out of the internal threads, of the oil tubes. According to the lining tubing coupling structure, by the adoption of the mode that the threads are meshed with the lining ring, the threads are corrosion resistant, the inward convex structure of the lining ring is adopted to fill the reserved space between the two oil tubes, one lining ring can have the dual effects of sealing the threads and filling the reserved space of the coupling body, the lining mode is simplified, the cost is saved, and production efficiency is improved.

Description

A kind of liner tubing coupling
Technical field
The utility model relates to oil tool field, particularly a kind of liner tubing coupling for connected pipes.
Background technology
At present, the about 10m of every length of oil pipe that oil field is used, need be connected to form the tubing string of hundreds of to several kms with box cupling, and producing well is used for exporting extraction oil, water injection well for delivery of injected water.Because pumped (conveying) medium has certain corrosivity, oil pipe inside can adopt the modes such as corrosion-inhibiting coating, nickel phosphor plating or inner liner compound pipe to process, obtain good effect, extend the application life of oil pipe, but also there is following problem: 1. for connecting the root of two screw threads in the box cupling of two oil pipes, be reserved with withdrawing space, liquid in pipe is easily detained at this place, cause the heavy corrosion of box cupling body; 2. connecting thread contacts with corrosive medium, screw thread corrosion aggravation.For addressing the above problem, in prior art, mainly take the joint of two oil pipes in box cupling that joint ring is set, to prevent pumped (conveying) medium corrosion box cupling body and connecting thread.For example, the patent specification of the anti-corrosion oil pipe coupler that on July 7th, 2010 to disclose the patent No. be 200920246219.4, disclose between two oil pipe connecting threads and be provided with protruding joint ring, the end of oil pipe and joint ring extruding form sealing, the difficult control of width of joint ring, in the process of tightening at oil pipe, make it produce projection, internal diameter of the pipeline is diminished, affect the operation of instrument in tubing string; 2. on May 27th, 2009 anti-corrosive oil pipe joint that the disclosed patent No. is 200820027520.1 patent specification, the joint ring that is provided with uniform internal diameter between two oil pipe connecting threads is disclosed, tubing round thread and joint ring interlock form sealing, but after two tubing round thread connect, its end also has certain headspace, is easily detained foreign matter.
Utility model content
The utility model is single for tubing coupling structure function in prior art, the problem that antiseptic effect is poor, both the screw thread that can be tightly connected after providing a kind of liner tubing coupling realization to be connected with oil pipe can also closely be filled the headspace between oil pipe, make oil pipe internal orifice dimension and liner tubing coupling internal orifice dimension basic to, effectively prevent from managing the exposed tubing round thread of interior dielectric corrosion and the foreign body retention headspace in two oil pipe junctions.
The purpose of this utility model is to realize like this, a kind of liner tubing coupling, comprise box cupling body, in described box cupling body, two ends are respectively equipped with the internal thread for connected pipes, the corresponding end of described box cupling inner body wall middle part two internal threads is provided with escape, in described escape, coordinate and be installed with inner bushing ring, described inner bushing ring inwall axially middle part is provided with the interior convex surface equating with pipe aperture to be connected, and described interior convex surface both sides are provided with successively respectively the conical surface that coordinates with the chamfering of oil pipe end face and stretch out with oil pipe the occlusal surface that the screw thread of internal thread screws.
Liner tubing coupling structure of the present utility model, before connected pipes, first inner bushing ring is installed in escape, periphery and the escape of inner bushing ring are closely cooperated, oil pipe to be connected is connected with the connecting thread at box cupling body two ends respectively, when oil pipe is screwed into behind position, the not chamfer of oil pipe and the cone match of inner bushing ring, the male thread that oil pipe stretches out inner bushing ring thread segment coordinates with occlusal surface screwing hermetic, after simultaneously the oil pipe at two ends is connected with box cupling body and puts in place, the interior convex surface of pipe aperture and inner bushing ring forms the medium internal channel of smooth transition, can not make connecting portion produce undergauge and affect pipe in instrument pass through.Therefore structure of the present utility model, it is anticorrosion that the mode of employing screw thread and inner bushing ring interlock solves screw thread, adopt the headspace between inner bushing ring convex structure filling two oil pipes, realize the double action that an inner bushing ring has sealing thread and fills the headspace of box cupling body, simplify liner mode, cost-saving, enhance productivity.
For being further convenient to clamping of inner bushing ring, being circumferentially with of described inner bushing ring be convenient to by inner bushing ring snap fits into escape and with the diagonal cut joint that is radially acute angle, the direction of described diagonal cut joint is identical with the rotation direction of screw thread, described inner bushing ring outside dimension under nature is greater than escape internal diameter size, and inner bushing ring and escape clamp rear diagonal cut joint tight closure.The opening inner bushing ring of this structure, when diagonal cut joint oblique is convenient to realize oil pipe and box cupling body and screwed, inner bushing ring diagonal cut joint closely cooperates with escape under the effect of screw extrusion.
For ease of realizing clamping and positiver sealing of inner bushing ring, described inner bushing ring be circumferentially with the profile of tooth fore shaft of being convenient to inner bushing ring to snap fits into escape, the section of described profile of tooth fore shaft is provided with the lock tooth of mutual interlock, described inner bushing ring outside dimension under nature is greater than escape internal diameter size, and inner bushing ring and escape clamp the closely interlock mutually of rear described lock tooth.
As the preferred version of profile of tooth opening inner bushing ring structure, the profile of tooth of described lock tooth is mutual interlock stepped tooth, semicircle or lance tooth.
Brief description of the drawings
Fig. 1 is liner tubing coupling structural representation of the present utility model.
Fig. 2 is the structural representation of the inner bushing ring of diagonal cut joint structure.
Fig. 3 is the structural representation of the inner bushing ring of profile of tooth hatch frame.
Wherein, 1 box cupling body; 2 inner bushing rings; 201 occlusal surfaces; 202 conical surfaces; 203 interior convex surfaces; 204 diagonal cut joints; 205 profile of tooth fore shafts.
Detailed description of the invention
Embodiment 1
As shown in Figure 1, for liner tubing coupling of the present utility model, comprise box cupling body 1, the interior two ends of box cupling body 2 are respectively equipped with the internal thread for connected pipes, the corresponding end of box cupling body 1 inwall middle part two internal threads is provided with escape, in escape, coordinate and be installed with inner bushing ring 2, in the present embodiment, inner bushing ring 2 external diameters and escape internal diameter adopt interference fit, before connected pipes, inner bushing ring 2 undergauges are inserted in escape, then recovering life size by nature or heating inner bushing ring 2 combines closely itself and escape, inner bushing ring 2 inwalls axially middle part are provided with the interior convex surface 203 equating with pipe aperture to be connected, interior convex surface 203 both sides are provided with successively respectively the conical surface 202 that coordinates with the chamfering of oil pipe end face and stretch out with oil pipe the occlusal surface 201 that the screw thread of internal thread screws.
Liner tubing coupling structure of the present utility model, when connected pipes, oil pipe to be connected is connected with the connecting thread at box cupling body 1 two ends respectively, when oil pipe is screwed into behind position, the not chamfer of oil pipe and the cone match of inner bushing ring 2, the male thread that oil pipe stretches out inner bushing ring 2 thread segments coordinates with occlusal surface 202 screwing hermetics, after simultaneously the oil pipe at two ends is connected with box cupling body 1 and puts in place, the interior convex surface 203 of pipe aperture and inner bushing ring forms the medium internal channel of smooth transition, can have and prevent from managing the connecting portions such as interior dielectric corrosion internal thread.Therefore structure of the present utility model, adopt the mode of screw thread and inner bushing ring interlock to solve screw thread Anticorrosion, adopt the headspace between inner bushing ring convex structure filling two oil pipes, realize the double action that an inner bushing ring has sealing thread and fills the headspace of box cupling body, simplify liner mode, save cost, improved production efficiency.
Embodiment 2
As depicted in figs. 1 and 2, for the another kind of embodiment of liner tubing coupling of the present utility model, difference from Example 1 is, in the present embodiment, being circumferentially with of inner bushing ring 2 be convenient to by inner bushing ring 2 snap fits into escape and with the diagonal cut joint 204 that is radially acute angle, the direction of diagonal cut joint 204 is identical with the rotation direction of screw thread, for example, in the time that the internal thread of the box cupling body of connected pipes is right-handed thread, as shown in Figure 2, diagonal cut joint 204 is left low right height, in the time that internal thread is left hand thread, diagonal cut joint 204 is right low left high, inner bushing ring 204 diagonal cut joint under nature has its outside dimension of certain gap to be slightly larger than escape internal diameter size, inner bushing ring 2 clamps rear diagonal cut joint 204 tight closure with escape.The inner bushing ring 2 of the present embodiment is simple in structure, easy for installation, good seal performance.
Embodiment 3
As shown in figures 1 and 3, for another embodiment of liner tubing coupling of the present utility model, be with embodiment 1 and embodiment 2 differences, inner bushing ring 2 be circumferentially with the profile of tooth fore shaft 205 of being convenient to inner bushing ring 2 to snap fits into escape, the section of profile of tooth fore shaft 205 is provided with the lock tooth of mutual interlock, wherein, the profile of tooth of lock tooth is mutual interlock stepped tooth, semicircle or lance tooth, there is certain gap at nature lower toothed fore shaft 205 in inner bushing ring 2, its outside dimension is greater than escape internal diameter size, inner bushing ring 2 clamps the mutually tight interlock of rear lock tooth with escape and realizes tight seal and filling.

Claims (4)

1. a liner tubing coupling, comprise box cupling body, in described box cupling body, two ends are respectively equipped with the internal thread for connected pipes, it is characterized in that, the corresponding end of described box cupling inner body wall middle part two internal threads is provided with escape, in described escape, coordinate and be installed with inner bushing ring, described inner bushing ring inwall axially middle part is provided with the interior convex surface equating with pipe aperture to be connected, and described interior convex surface both sides are provided with successively respectively the conical surface that coordinates with the chamfering of oil pipe end face and stretch out with oil pipe the occlusal surface that the screw thread of internal thread screws.
2. liner tubing coupling according to claim 1, it is characterized in that, being circumferentially with of described inner bushing ring be convenient to by inner bushing ring snap fits into escape and with the diagonal cut joint that is radially acute angle, the direction of described diagonal cut joint is identical with the rotation direction of screw thread, described inner bushing ring outside dimension under nature is greater than escape internal diameter size, and inner bushing ring and escape clamp rear diagonal cut joint tight closure.
3. liner tubing coupling according to claim 1, its feature ?in, described inner bushing ring be circumferentially with the profile of tooth fore shaft of being convenient to inner bushing ring to snap fits into escape, the section of described profile of tooth fore shaft is provided with the lock tooth of mutual interlock, described inner bushing ring outside dimension under nature is greater than escape internal diameter size, and inner bushing ring and escape clamp the closely interlock mutually of rear described lock tooth.
4. liner tubing coupling according to claim 3, is characterized in that, the profile of tooth of described lock tooth is mutual interlock stepped tooth, semicircle or lance tooth.
CN201420257878.9U 2014-05-20 2014-05-20 Lining tubing coupling Active CN203847015U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420257878.9U CN203847015U (en) 2014-05-20 2014-05-20 Lining tubing coupling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420257878.9U CN203847015U (en) 2014-05-20 2014-05-20 Lining tubing coupling

Publications (1)

Publication Number Publication Date
CN203847015U true CN203847015U (en) 2014-09-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420257878.9U Active CN203847015U (en) 2014-05-20 2014-05-20 Lining tubing coupling

Country Status (1)

Country Link
CN (1) CN203847015U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105386728A (en) * 2015-12-07 2016-03-09 西安三环科技开发总公司 Special coupling for high molecular weight polyethylene lined oil tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105386728A (en) * 2015-12-07 2016-03-09 西安三环科技开发总公司 Special coupling for high molecular weight polyethylene lined oil tube

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