CN104005711A - Anti-scaling tubing coupling structure - Google Patents

Anti-scaling tubing coupling structure Download PDF

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Publication number
CN104005711A
CN104005711A CN201410251220.1A CN201410251220A CN104005711A CN 104005711 A CN104005711 A CN 104005711A CN 201410251220 A CN201410251220 A CN 201410251220A CN 104005711 A CN104005711 A CN 104005711A
Authority
CN
China
Prior art keywords
antiscale property
good antiscale
lining
tubing coupling
pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410251220.1A
Other languages
Chinese (zh)
Inventor
陆华飞
彭中
李汉周
石建设
罗江涛
李荣明
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.)
Nantong City Hua Ye Petroleum Machinery Co Ltd
Original Assignee
Nantong City Hua Ye Petroleum Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nantong City Hua Ye Petroleum Machinery Co Ltd filed Critical Nantong City Hua Ye Petroleum Machinery Co Ltd
Priority to CN201410251220.1A priority Critical patent/CN104005711A/en
Publication of CN104005711A publication Critical patent/CN104005711A/en
Pending legal-status Critical Current

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Abstract

The invention relates to an anti-scaling tubing coupling structure. Internal threads are formed at the two ends of the inner wall of the tubing coupling; the internal threads are sealing tapered internal threads; an anti-scaling lining is fixed at the middle part of the inner wall of the tubing coupling; the anti-scaling lining is made of a material capable of preventing the adsorption and remaining of fouling so that the probability that crude oil impurities are adsorbed and remained is reduced; meanwhile, a special oil tube is adopted to prevent the wear of a sucker rod and the inner wall of the oil tube and the internal corrosion of the oil tube and to protect a sucker rod column. The special oil tube is provided with a turnup, the inner and outer rings of the tube orifice of the turnup are chamfered, and the lining of the special oil tube is connected with the transitional section of the anti-scaling lining, and therefore, the coupling is well protected and the service life of the coupling is increased.

Description

A kind of good antiscale property tubing coupling structure
Technical field
The present invention relates to a kind of vitta structure, particularly a kind of good antiscale property tubing coupling structure.
Background technology
Current oil liner oil pipe all adopts built-in anticorrosion antiwear inner liner in oil pipe, can prevent the wearing and tearing of sucker rod and tube inner wall and the internal corrosion of oil pipe.Liner surface is smooth, pliable and tough, can prevent first sucker rod and tube inner wall direct friction, second can reduce the wear extent of sucker rod.Therefore, wearing layer can all play down protective effect to oil pipe and sucker rod simultaneously.
In addition,, because the friction factor of inside lining anti-corrosive wearing layer is lower, make the output torque of oil well polished rod load, reducer gear case, rod string bottom minimum stress all have significant reduction.And polished rod maximum load and minimum load be poor also significant reduction.The load reduction of the upper and lower stroke of sucker rod, can reduce sucker rod first because of the crooked degree of pressurized, improves pipe bar wear condition, and two can reduce the energy consumption of whole system.
In conventional oil liner vitta structure, adjacent liner oil pipe connects by box cupling when taking over, and box cupling is a female body of two ends tool, and adjacent liner oil pipe end is threaded with two internal threads of box cupling respectively.The shortcoming of this structure is: due to the internal thread employing pipe joint screw thread of box cupling, conical internal thread, therefore, cannot guarantee to fit tightly between two liner oil pipe ends after connection, and then leave one section of long or short annular gap.Liner oil pipe is in use procedure over a long time, and crude oil may rest in this annular gap for a long time, directly contacts, and then cause corrosion to scrap to box cupling with box cupling inwall.And because box cupling is steel material, carry out maintaining even if release, the dirt that covers its inwall is also difficult to clean, the application life of having reduced box cupling.
For avoiding the gap that between two oil pipe ends in above-mentioned box cupling, crude oil is held in existence, there is part producer when installing, safeguarding oil pipe, between two oil pipe ends of box cupling, place gasket seal or shading ring, and then elimination gap, avoid crude oil to retain for a long time in this gap, double thread etc. cause corrosion.But still there is certain defect in it: when install (1), by manually place gasket seal in box cupling, installation procedure is loaded down with trivial details, and in twisting the process connecing, there will be pad card pipe phenomenon; (2) because oil pipe is in long-term use and disassembly, cleaning process repeatedly, can there is partial deformation in its end, while therefore docking at every turn, the gap of two oil pipe ends between box cupling all can gradually change, the gasket seal of suitable thickness cannot be selected, therefore, the gap between oil pipe end cannot be eliminated completely, still there is the long-term problem of retaining of crude oil, and then continue to affect the application life of box cupling.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of good antiscale property tubing coupling structure that facilitates installation and maintenance, long service life.
For solving the problems of the technologies described above, technical scheme of the present invention is: described tubing coupling inwall two ends are provided with internal thread, and this internal thread is sealing conical inner screw thread; Described tubing coupling inwall stage casing is fixed with good antiscale property lining.
Further: described tubing coupling inwall stage casing is processed with lining embedding groove, and described good antiscale property lining is embedded in this good antiscale property lining.
Further: described good antiscale property lining is the pipe structure that a good antiscale property material is made; Body two ends have respectively a conical section endoporus, and the tapering of this conical section endoporus is greater than the tapering of conical inner screw thread.
Further: the tapering of described good antiscale property lining is between 1:0.5 at 1:2.
Further: the two ends of described good antiscale property lining also have respectively a cylindrical section transitional pore that is positioned at conical section endoporus outside on lining axis direction, and the internal diameter of this cylindrical section transitional pore is identical with the large footpath of the small end of conical inner screw thread.
Further: described good antiscale property tubing coupling is equipped with application tube; Described application tube two ends arrange external thread structure, and application tube box cupling two ends arrange female thread structure, between adjacent application tube, by tubing coupling, are threaded; The built-in internal lining pipe with its interference fit of described application tube, described internal lining pipe at the mouth of pipe place of application tube along oil pipe radially flange form the flange mouth of pipe, flange mouth of pipe external diameter is less than footpath at the bottom of oil tube external thread; Described flange mouth of pipe inner ring place arranges circular arc chamfering.
Further, described good antiscale property oil pipe adopts ultra-high molecular weight polyethylene or polytetrafluoroethylene (PTFE) oil pipe.
The invention has the advantages that: utilize good antiscale property lining to fill the gap between two liner oil pipe ends in box cupling, reduce the stop of greasy dirt, reduce fouling probability.Good antiscale property lining is fixed in box cupling by modes such as extrusion modlings, during without installation, by manually inserting, has improved installation effectiveness.Good antiscale property lining adopts the material with dirt-proof absorption stop to make, and reduces the probability of crude oil impurity absorption, stop; Good antiscale property lining has two conical section endoporus, and application tube arranges flange, and the inside and outside circle at flange mouth of pipe place all arranges chamfering; Make the application tube of lining and outfit in installation process, can guarantee that liner oil pipe coordinates with coupling compact, and if liner oil pipe long-term, still can be good at coordinating after using Leading Edge Deformation, avoid leakage of oil.
Accompanying drawing explanation
Fig. 1 is the oil pipe original state schematic diagram of a kind of good antiscale property tubing coupling of the present invention structure.
Fig. 2 is the oil pipe end-state schematic diagram of a kind of good antiscale property tubing coupling of the present invention structure.
Fig. 3 is the good antiscale property lining partial enlarged drawing of a kind of good antiscale property tubing coupling of the present invention structure.
Concrete implementation content
A kind of good antiscale property tubing coupling structure shown in Fig. 1,2,3, described tubing coupling 1 inwall two ends are provided with internal thread, and this internal thread is sealing conical inner screw thread; Described tubing coupling 1 inwall stage casing is built-in with good antiscale property lining 2; Tubing coupling inwall stage casing is processed with lining embedding groove, and good antiscale property lining 2 is embedded in this tubing coupling 1 by modes such as extrusion modlings.
Good antiscale property lining 2 shown in Fig. 3 is the pipe structure that a good antiscale property material is made; Body two ends have respectively a conical section endoporus 5, and the tapering of this conical section endoporus 5 is greater than the tapering of conical inner screw thread, and the tapering of good antiscale property lining is between 1:0.5 at 1:2.
The two ends of good antiscale property lining 2 also have respectively a cylindrical section transitional pore 6 that is positioned at conical section endoporus outside on lining axis direction, and the internal diameter of this cylindrical section transitional pore 6 is identical with the large footpath of the small end of conical inner screw thread.
Good antiscale property tubing coupling is equipped with application tube 3; Described application tube 3 two ends arrange external thread structure, and application tube 3 box cupling two ends arrange female thread structure, between adjacent application tube 3, by tubing coupling, are threaded; The internal lining pipe 4 of described application tube built-in 3 and its interference fit, described internal lining pipe 4 at the mouth of pipe place of application tube 3 along oil pipe radially flange form the flange mouth of pipe, flange mouth of pipe external diameter is less than footpath at the bottom of oil tube external thread; Described flange mouth of pipe inner ring place is provided with circular arc chamfering.
Good antiscale property oil pipe adopts ultra-high molecular weight polyethylene or polytetrafluoroethylene (PTFE) oil pipe, and following table is for adopting the test case of good antiscale property oil pipe to 60 conventional tubing couplings and the present invention:
Traditional tubing coupling after use,
? Tradition oil pipe Good antiscale property oil pipe gathers (tetrafluoroethene lining) Good antiscale property oil pipe surpasses (High molecular weight polyethylene lining)
Lining friction factor (before use) / 0.10-0.17 0.09-0.13
Lining friction factor (using after 24 months) / 0.11-0.20 0.10-0.17
Box cupling stage casing layer of scale average thickness (mm of unit) 3.5-5.0; And in box cupling, layer of scale is not exclusively uniformly distributed, and causes hole inclined to one side 0.12-0.20 0.10-0.16
Dismounting difficulty Part box cupling and oil pipe cannot be dismantled smoothly Smoothly Smoothly
Application life The box cupling layer of scale removing after 24 months is adsorbed on box cupling inwall, is difficult to remove, and needs to change Layer of scale adsorbs in the form of sheets, easily cleaning; After cleaning, can continue to use Layer of scale adsorbs in the form of sheets, easily cleaning; After cleaning, can continue to use
As can be seen from the above table, adopted the oil pipe of ultra-high molecular weight polyethylene of the present invention or polytetrafluoroethylene bushing, it is after a life cycle finishes, its friction factor is substantially without too large variation, and the fouling thickness in box cupling stage casing is very low, dismounting smoothly, can be come into operation after cleaning again, greatly reduces cost.
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and manual, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.

Claims (7)

1. a good antiscale property tubing coupling structure, is characterized in that: described tubing coupling inwall two ends are provided with internal thread, and this internal thread is sealing conical inner screw thread; Described tubing coupling inwall stage casing is fixed with good antiscale property lining.
2. a kind of good antiscale property tubing coupling structure according to claim 1, is characterized in that: described tubing coupling inwall stage casing is processed with lining embedding groove, and described good antiscale property lining is embedded in this good antiscale property lining embedding groove.
3. a kind of good antiscale property tubing coupling structure according to claim 1 and 2, is characterized in that: described good antiscale property lining is the pipe structure that a good antiscale property material is made; Body two ends have respectively a conical section endoporus, and the tapering of this conical section endoporus is greater than the tapering of conical inner screw thread.
4. a kind of good antiscale property tubing coupling structure according to claim 3, is characterized in that: the tapering of described good antiscale property lining is between 1:0.5 at 1:2.
5. a kind of good antiscale property tubing coupling structure according to claim 3, it is characterized in that: the two ends of described good antiscale property lining also have respectively a cylindrical section transitional pore that is positioned at conical section endoporus outside on lining axis direction, and the internal diameter of this cylindrical section transitional pore is identical with the large footpath of the small end of conical inner screw thread.
6. a kind of good antiscale property tubing coupling structure according to claim 1, is characterized in that: described good antiscale property tubing coupling is equipped with application tube; Described application tube two ends arrange external thread structure, and application tube box cupling two ends arrange female thread structure, between adjacent application tube, by tubing coupling, are threaded; The built-in internal lining pipe with its interference fit of described application tube, described internal lining pipe at the mouth of pipe place of application tube along oil pipe radially flange form the flange mouth of pipe, flange mouth of pipe external diameter is less than footpath at the bottom of oil tube external thread; Described flange mouth of pipe inner ring place is provided with circular arc chamfering.
7. a kind of good antiscale property tubing coupling structure according to claim 1, is characterized in that: described good antiscale property oil pipe adopts ultra-high molecular weight polyethylene or polytetrafluoroethylene (PTFE) oil pipe.
CN201410251220.1A 2014-06-09 2014-06-09 Anti-scaling tubing coupling structure Pending CN104005711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410251220.1A CN104005711A (en) 2014-06-09 2014-06-09 Anti-scaling tubing coupling structure

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Application Number Priority Date Filing Date Title
CN201410251220.1A CN104005711A (en) 2014-06-09 2014-06-09 Anti-scaling tubing coupling structure

Publications (1)

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CN104005711A true CN104005711A (en) 2014-08-27

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106481282A (en) * 2016-11-27 2017-03-08 无锡金顶石油管材配件制造有限公司 A kind of petroleum pipeline deferent box cupling structure
CN106481285A (en) * 2016-11-29 2017-03-08 无锡金顶石油管材配件制造有限公司 A kind of abrasion-proof corrosion-proof oil pipes box cupling
CN108194034A (en) * 2018-03-19 2018-06-22 大庆鑫得丰石油技术有限公司 Five preventing oil pipes and short circuit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201521258U (en) * 2009-10-13 2010-07-07 河北华北石油荣盛机械制造有限公司 Anti-corrosion oil pipe coupler
US20110203790A1 (en) * 2010-02-25 2011-08-25 Carstensen Kenneth J System and method for sealing couplings in downhole tubing strings
CN203515346U (en) * 2013-10-17 2014-04-02 南通市华业石油机械有限公司 Special lined oil pipe
CN204175198U (en) * 2014-06-09 2015-02-25 南通市华业石油机械有限公司 A kind of good antiscale property tubing coupling structure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201521258U (en) * 2009-10-13 2010-07-07 河北华北石油荣盛机械制造有限公司 Anti-corrosion oil pipe coupler
US20110203790A1 (en) * 2010-02-25 2011-08-25 Carstensen Kenneth J System and method for sealing couplings in downhole tubing strings
CN203515346U (en) * 2013-10-17 2014-04-02 南通市华业石油机械有限公司 Special lined oil pipe
CN204175198U (en) * 2014-06-09 2015-02-25 南通市华业石油机械有限公司 A kind of good antiscale property tubing coupling structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106481282A (en) * 2016-11-27 2017-03-08 无锡金顶石油管材配件制造有限公司 A kind of petroleum pipeline deferent box cupling structure
CN106481285A (en) * 2016-11-29 2017-03-08 无锡金顶石油管材配件制造有限公司 A kind of abrasion-proof corrosion-proof oil pipes box cupling
CN108194034A (en) * 2018-03-19 2018-06-22 大庆鑫得丰石油技术有限公司 Five preventing oil pipes and short circuit

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Application publication date: 20140827