CN104695873A - Integral joint of direct connecting type high-strength/speed pipe column and processing method - Google Patents
Integral joint of direct connecting type high-strength/speed pipe column and processing method Download PDFInfo
- Publication number
- CN104695873A CN104695873A CN201310655902.4A CN201310655902A CN104695873A CN 104695873 A CN104695873 A CN 104695873A CN 201310655902 A CN201310655902 A CN 201310655902A CN 104695873 A CN104695873 A CN 104695873A
- Authority
- CN
- China
- Prior art keywords
- joint
- pipe
- thread
- speed
- type high
- 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
Links
Abstract
The invention discloses an integral joint of a direct connecting type high-strength/speed pipe column and a processing method, and belongs to the technical field of drainage gas recovery pipe columns. A left joint has an external thread, a right joint has an internal thread, and the left joint and the right joint are directly in threaded connection, so that the mechanical performance of the joints are higher than that of a pipe body, and higher connecting strength is provided; a conical surface is arranged on the periphery of the left joint, so that enough tightness is provided; and the thread is a coarse thread trapezoidal taper thread. The processing method upsets, thickens and thermally treats a low-carbon steel (45# steel seamless steel pipe) pipe end to largely improve the connecting strength and the internal pressure strength of a low-carbon steel pipe column joint. The designed structural form of the integral joint is convenient for underground operation in site. Meanwhile, the designed thread form is liable to oppositely buckle, so that the buckling speed is fast, and the underground operation speed in site is accelerated. The joint realizes the purpose of adopting the seamless steel pipe (45# steel) as a drainage gas recovery speed pipe column of a gas well; and the speed pipe column can replace a traditional continuous oil pipe to perform the drainage gas recovery operation of a large number of low-pressure and low-yield gas wells in gas fields, so that the later extraction cost of the gas fields is largely reduced.
Description
Technical field
The present invention relates to the tubing string integral joint of a kind of direct linkage type high strength speed and processing method, belong to water pumping gas production string technology field.
Background technology
Gas well development late stage, bottom pressure reduces, and gas well fluid-carrying capability is deteriorated, and generally installs the flow string of smaller szie (caliber≤38mm) at Wellbore of Gas Wells, improves gas well fluid-carrying capability, resumes production.According to J55, N80 carbon steel tube of API specification, its minimum gauge oil pipe also can meet the demand of water drainage-gas recovery technology, under different well depth, meet mechanical property requirements, but its price is several times of common specification oil pipe.Existing technique is the mode water pumping gas production entering CT-70 coiled tubing (Φ 38 × 3.18) under adopting, but its tubing cost is higher.
In order to the later stage meeting a large amount of low-voltage and low-yield gas well in gas field produces, a kind of mild steel (45# steel seamless steel tube) that adopts of exploitation is as the water pumping gas production speed tubing string of main body tubing string, and its individual well cost can reduce about 40% than CT-70 coiled tubing.But mild steel intensity is lower, how designs its pipe connecting mode and ensure that its switching performance is main purpose of the present invention.
In petroleum industry, oil pipe is generally adopt box cupling form to connect at present, and namely the connection of two oil pipes must by the box cupling of a centre, and box cupling has box thread, and the male thread of two oil pipes is coupled, finally assemblies complete flow string.Adopt this kind of connected mode, the intensity of mild steel can not meet the requirement of the joint bonding strength under gas well well depth.
Current integral joint is generally outer plain adapter or close to outer flat joint, its external diameter is equal with the external diameter of the pipe that will assemble or slightly large.But shortcoming is its mechanical connection performance, e.g., stretches, the corresponding performance of bending strength ratio pipe self is much lower, changes in the scope of 65% ~ 75%.Adopt this kind of connected mode for oil pipe, then there is certain risk when work production.Disclose the mechanical performance how improving this kind of joint in part document, as in CN1265445A patent, by arranging the metal to metal seal at two-stage internal and external screw thread and two ends in the pipe of two ends, one end of joint and center arrange two shoulders.This kind of design can improve the mechanical performance of joint, but in actual going into the well, this kind of joint screw thread design is complicated, and make-up is difficult, and make-up speed is slow.In CN2825920Y patent, devise a kind of tubing with integral joint, its Main is provided with the metallic sealing sections such as the face of cylinder, the conical surface, sphere and reverse frustum of a cone terrace, and design double step structure, this kind of design improves the sealing effectiveness of joint and anti-mistake turns round ability, mainly meets the high antitorque special operation condition needs such as well workover, acid fracturing in oil field.But its Design of Screw Thread is complicated, and difficulty of processing is large.For the speed tubing string of sizable application in low-voltage and low-yield gas well, its high cost, limits application.And having no report in all documents when being used for gas well well depth (> 3000m), when especially adopting mild steel as tubing string material, whether the bonding strength of joint satisfies the demands, and ensures certain sealability.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides the integral joint of a kind of speed tubing string and processing method.
The integral joint of a kind of direct linkage type high strength speed tubing string, there is bonding strength high, good airproof performance, make-up is easy, the advantage that make-up speed is fast, the water pumping gas production needs of gas field low-voltage and low-yield well can be met, adopt the mild steel speed tubing string of this joint to substitute coiled tubing, realize the significantly reduction of gas well cost of winning.
The integral joint of a kind of direct linkage type high strength speed tubing string, left joint has external screw thread, and right connector has internal thread, and left joint is directly threaded with right connector, and the excircle of left joint has the conical surface, and screw thread is coarse thread ladder type taper thread.
The male connection of left joint and the female adapter wall thickness of right connector are greater than body, and the internal diameter of left joint, the internal diameter of right connector are identical with body.
The compensation grade of left joint, right connector and body is 15 ° ~ 20 °.
The integral joint of a kind of direct linkage type high strength speed tubing string, this joint is that external thread form exists within body two ends.Mother tube (45# steel seamless steel tube) pipe end is carried out pier and slightly thickeies process, be heated to forging temperature by pipe end, then process on special pier pipe machine, pier pipe machine is equipped with special core rod, and slightly rear pipe internal diameter and wall thickness reach requirement can to control pier.Pipe end after thick to pier carries out suitable heat treatment, and the tubing after process is shaping by processing internal and external threads respectively after alignment, flaw detection.
Further, described its external diameter of speed casing adapter is greater than oil pipe body, and joint and body exist a compensation grade (being about 15 ° ~ 20 °), the overall latus rectum (see figure 1) identical with oil pipe body of joint.
Described speed casing adapter, joint is overall through heat treatment process, and its mechanical property, higher than oil pipe body, provides higher bonding strength and internal pressure strength.
Described speed casing adapter, its screw thread is coarse thread ladder type taper thread, and threaded tip processes a cone step metallic sealing section (see figure 2) outside, provides good sealing effectiveness.
A processing method for speed tubing string integral joint, containing following steps;
Mother tube (45# steel seamless steel tube) pipe end is carried out pier and slightly thickeies process, be heated to forging temperature by pipe end, then process on special pier pipe machine, pier pipe machine is equipped with special core rod, and slightly rear pipe internal diameter and wall thickness reach requirement can to control pier; Pipe end after thick to pier is heat-treated, and the tubing after process is shaping by processing internal and external threads respectively after alignment, flaw detection, and threaded tip processes a conical surface metallic sealing section outside.
Male connection and female adapter wall thickness are greater than oil pipe body, and internal diameter is identical with oil pipe body; Joint mechanical property, higher than tube body, provides higher bonding strength; Its screw thread is coarse thread ladder type taper thread, and threaded tip processes a conical surface metallic sealing section outside, provides enough sealings; Make-up is easy, and make-up speed is fast, improves the speed of on-the-spot lower well operations.Adopt the mild steel speed tubing string of this joint can replace the water pumping gas production operation that used coiled tubing carries out a large amount of low-voltage and low-yield gas well in gas field, reduce gas-field exploitation cost.
Beneficial effect of the present invention:
(1) carry out pier to the pipe end of mild steel (45# steel seamless steel tube) slightly to thicken and heat treatment process, significantly improve bonding strength and the internal pressure strength of low carbon steel pipe column joint.
(2) the integral joint form of structure designed, convenient on-the-spot lower well operations.The thread forms make-up simultaneously designed is easy, and make-up speed is fast, improves the speed of on-the-spot lower well operations.
(3) this joint is adopted, achieve the object of seamless steel pipe (45# steel) as gas well water pumping gas production speed tubing string, this speed tubing string can replace the water pumping gas production operation that used coiled tubing carries out a large amount of low-voltage and low-yield gas well in gas field, significantly reduces gas field later stage cost of winning.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by referring to detailed description below, more completely can understand the present invention better and easily learn wherein many adjoint advantages, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention, as schemed wherein:
Fig. 1 is the connection diagram of a kind of direct linkage type high strength of the present invention speed tubing string integral joint;
Fig. 2 is the screw thread shape appearance figure of direct linkage type high strength speed casing adapter of the present invention;
Below in conjunction with drawings and Examples, the present invention is further described.
Detailed description of the invention
Obviously, the many modifications and variations that those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
Embodiment 1:
Adopt the 45# steel seamless steel tube of specification Φ 38 × 4mm as speed tubing string.When gas well well depth is 3000m, tubing string deadweight is 10.05 tons (Φ 38 × 4mm45# steel pipeline quality is 3.35kg/m).
If select ordinary couplings, thread forms is still coarse thread ladder type taper thread.Joint bonding strength now can be calculated as follows:
D is external diameter (38mm); D is internal diameter (30mm); T is that screw thread is dark, 2.2mm; σ
sfor the SMYS of 45# carbon steel, 353MPa.Joint bonding strength is now that 63.5KN(is about 6.48 tons), namely as well depth 3000m, this strength of joint can not bear tubing string deadweight, cannot meet the demands.
Same material and specification, select joint of the present invention, as shown in Figure 1, Figure 2.
Its external diameter is Φ 50mm, and the compensation grade of joint and body is 15 ° ~ 20 °, and the overall latus rectum of joint is Φ 30mm.Screw thread is coarse thread ladder type taper thread, height of thread 2.7mm, pitch 6mm, and threaded tip processes a cone step metallic sealing section outside, conical surface length 6mm, axis direction 5mm.
Tensile strength test in kind and internal pressure strength test have been carried out in butt joint, and its intensity is conducted oneself with dignity much larger than tubing string, and sealing effectiveness is good, meets gas well water pumping gas production requirement.Result of the test is (in following table, T1, T2 are parallel sample):
1, failure test is stretched to
2, internal pressure strength (hydrostatic test)
The integral joint of a kind of direct linkage type high strength speed tubing string, 45# steel seamless steel tube pipe end is carried out pier and slightly thickeies process, carry out high-frequency heating by pipe end, then process on special pier pipe machine, pier pipe machine is equipped with special core rod, and slightly rear pipe internal diameter and wall thickness reach requirement can to control pier.Pipe end after thick to pier carries out suitable heat treatment, and the tubing after process is shaping by processing internal and external threads respectively after alignment, flaw detection;
Joint material is identical with body, but through heat treatment process, its mechanical property, higher than body, improves the antiskid button ability (bonding strength) of joint.
Male connection and female adapter wall thickness are greater than body, and internal diameter is identical with body.
The compensation grade of joint and body is 15 ° ~ 20 °.
Screw thread is coarse thread ladder type taper thread, and threaded tip processes a conical surface metallic sealing section outside, provides enough sealings.
Make-up is easy, and make-up speed is fast, improves the speed of on-the-spot lower well operations.Adopt the mild steel speed tubing string of this joint can replace the water pumping gas production operation that used coiled tubing carries out a large amount of low-voltage and low-yield gas well in gas field, reduce gas-field exploitation cost.
As mentioned above, embodiments of the invention are explained, but as long as do not depart from inventive point of the present invention in fact and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation is also all included within protection scope of the present invention.
Claims (4)
1. a direct linkage type high strength speed tubing string integral joint, it is characterized in that left joint has external screw thread, right connector has internal thread, and left joint is directly threaded with right connector, and the excircle of left joint has the conical surface, and screw thread is coarse thread ladder type taper thread.
2. a kind of direct linkage type high strength speed tubing string as claimed in claim 1 integral joint, it is characterized in that the male connection of left joint and the female adapter wall thickness of right connector are greater than body, the internal diameter of left joint, the internal diameter of right connector are identical with body.
3. a kind of direct linkage type high strength speed tubing string as claimed in claim 1 integral joint, is characterized in that, the compensation grade of left joint, right connector and body is 15 ° ~ 20 °.
4. the processing method of a kind of direct linkage type high strength speed tubing string integral joint according to claim 1,2 or 3, it is characterized in that mother tube (45# steel seamless steel tube) pipe end is carried out pier slightly thickeies process, forging temperature is heated to by pipe end, then process on special pier pipe machine, pier pipe machine is equipped with special core rod, and slightly rear pipe internal diameter and wall thickness reach requirement can to control pier; Pipe end after thick to pier is heat-treated, and the tubing after process is shaping by processing internal and external threads respectively after alignment, flaw detection, and threaded tip processes a conical surface metallic sealing section outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310655902.4A CN104695873A (en) | 2013-12-06 | 2013-12-06 | Integral joint of direct connecting type high-strength/speed pipe column and processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310655902.4A CN104695873A (en) | 2013-12-06 | 2013-12-06 | Integral joint of direct connecting type high-strength/speed pipe column and processing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104695873A true CN104695873A (en) | 2015-06-10 |
Family
ID=53343378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310655902.4A Pending CN104695873A (en) | 2013-12-06 | 2013-12-06 | Integral joint of direct connecting type high-strength/speed pipe column and processing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104695873A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410022A (en) * | 2018-10-17 | 2019-11-05 | 陕西晟大钻探科技有限公司 | One kind being used for oil gas well mining direct linkage type small-size diameter string and its processing method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3468563A (en) * | 1966-08-10 | 1969-09-23 | Vallourec | Separable joint for pipes |
| CN87103385A (en) * | 1986-05-07 | 1987-11-18 | 梅尔文·塞缪尔·詹姆斯·恩尼斯 | Borehole drill construction |
| CN1030285A (en) * | 1987-06-29 | 1989-01-11 | 达尔米尼合股公司 | Sleeveless tubes for hydrocarbon pumping pipes |
| CN2092597U (en) * | 1991-05-29 | 1992-01-08 | 石油勘探开发科学研究院机械所 | Twisting moment joints of obverse and reverse directions |
| JP2000046261A (en) * | 1998-07-24 | 2000-02-18 | Onda Seisakusho:Kk | Piping adapter |
| CN101912939A (en) * | 2010-06-29 | 2010-12-15 | 宁波锐泰机械制造有限公司 | Extruding, upsetting and moulding die and corresponding upsetting method |
| CN203948040U (en) * | 2013-12-06 | 2014-11-19 | 中国石油天然气股份有限公司 | The integral joint of a kind of speed tubing string |
-
2013
- 2013-12-06 CN CN201310655902.4A patent/CN104695873A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3468563A (en) * | 1966-08-10 | 1969-09-23 | Vallourec | Separable joint for pipes |
| CN87103385A (en) * | 1986-05-07 | 1987-11-18 | 梅尔文·塞缪尔·詹姆斯·恩尼斯 | Borehole drill construction |
| CN1030285A (en) * | 1987-06-29 | 1989-01-11 | 达尔米尼合股公司 | Sleeveless tubes for hydrocarbon pumping pipes |
| CN2092597U (en) * | 1991-05-29 | 1992-01-08 | 石油勘探开发科学研究院机械所 | Twisting moment joints of obverse and reverse directions |
| JP2000046261A (en) * | 1998-07-24 | 2000-02-18 | Onda Seisakusho:Kk | Piping adapter |
| CN101912939A (en) * | 2010-06-29 | 2010-12-15 | 宁波锐泰机械制造有限公司 | Extruding, upsetting and moulding die and corresponding upsetting method |
| CN203948040U (en) * | 2013-12-06 | 2014-11-19 | 中国石油天然气股份有限公司 | The integral joint of a kind of speed tubing string |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410022A (en) * | 2018-10-17 | 2019-11-05 | 陕西晟大钻探科技有限公司 | One kind being used for oil gas well mining direct linkage type small-size diameter string and its processing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201705226U (en) | Integral type double-shoulder sulfur resistant drill rod | |
| CN202380987U (en) | Internal-external thread connector of thin-wall expansion pipe | |
| CN203463035U (en) | Screwed joint for petroleum casing pipe | |
| CN202380985U (en) | Tubular air seal thread joint | |
| CN201496003U (en) | Thread connector of special oil sleeve | |
| CN202900063U (en) | Air-tight seal oil tube threaded connector | |
| CN203948040U (en) | The integral joint of a kind of speed tubing string | |
| CN204139992U (en) | A kind of gas well at HTHP hermetic seal threaded connection structure of petroleum casing pipe | |
| CN104695873A (en) | Integral joint of direct connecting type high-strength/speed pipe column and processing method | |
| CN101899953A (en) | Thread joint structure for high-performance oil casing | |
| CN110439477B (en) | Double-layer combined sleeve with mismatched strength | |
| CN112049580A (en) | Connecting joint of bimetal composite oil pipe | |
| CN209398370U (en) | Composite oil pipe and oil pipe component for oil field machinery oil well | |
| CN206329284U (en) | A kind of dual hermetic seal special buckle oil pipe of metallic elastic | |
| CN2700542Y (en) | Special casing joint for thermal production well | |
| CN201851031U (en) | Thick-walled drill pipe | |
| CN201874485U (en) | Metal sealed casing threaded connecting structure based on API (American Petroleum Institute) standard round threads | |
| CN202611617U (en) | Internal and external thickening high-strength sleeve connector for thickened oil thermal production well | |
| CN209855720U (en) | Novel sealed oil casing structure that detains | |
| CN202578551U (en) | Oil well pipe screwed joint | |
| CN201943592U (en) | Novel external thickening oil pipe and sleeve | |
| CN101864906A (en) | Bending-resistant oil casing threaded connection structure | |
| CN201826763U (en) | Externally thickened tubing and casing | |
| CN110821419A (en) | High-temperature-resistant, corrosion-resistant and hydrogen sulfide-resistant composite sucker rod | |
| CN201786273U (en) | Skinner's macaroni for non-standard workover |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150610 |