CN101787881B - Shell of nitrogen pressure-transmission tube used for oilfield and welding method thereof - Google Patents
Shell of nitrogen pressure-transmission tube used for oilfield and welding method thereof Download PDFInfo
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- CN101787881B CN101787881B CN2010100047813A CN201010004781A CN101787881B CN 101787881 B CN101787881 B CN 101787881B CN 2010100047813 A CN2010100047813 A CN 2010100047813A CN 201010004781 A CN201010004781 A CN 201010004781A CN 101787881 B CN101787881 B CN 101787881B
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Abstract
The invention relates to a shell of a nitrogen pressure-transmission tube used for oilfield and a welding method thereof. The shell of the nitrogen pressure-transmission tube comprises: a cone-shaped plug at bottom, a column-shaped sleeve which is located at the upper part of the cone-shaped plug, an upper-part plug which is located at the upper part of the column-shaped sleeve, and a capillary tube which is located at the end surface of the upper-part plug. The main chemical compositions of the weld metal are as follows: 10-20 percent of Cr , 3-8 percent of Mn , 8-12 percent of Fe, and the rest percent of Ni. A WSM 315 pulse inverter welding machine is selected, and the welding current is of 50-60 amperes; the welding area is heated to 150 degrees C. with oxy-acetylene firstly; after welding, the welding area is heated to 600 degrees C. with a heating tape, and is slowly cooled. Compared with the prior art, the invention has the advantages that the surface of the lower-part plug is cone-shaped, beneficial for reduction of resistance when going down to the well; and the welding stress is fully released, beneficial for the success of the welding.
Description
Technical field:
The present invention relates to a kind of arc-welding method, further relate to a kind of shell of nitrogen pressure-transmission tube used for oilfield and welding method thereof.
Background technology:
Nitrogen pressure-transmission tube is the key components of oil field pressure test system with capillary, it is the visual plant during oil drilling is produced, be positioned at the joint second from the bottom of oil well, its Main Function is the pressure of down-hole to be changed conduct to ground, make ground can in time control the pressure variable force of down-hole, in order to take emergency measures, prevent the unexpected generation of gas blowout accident.Platform at sea particularly, because work area is little, in case something unexpected happened will produce serious consequence, its effect seems even more important.
The condition of work of pressure-transmission tube is abominable, and the degree of depth is large, and temperature is high, and mine gas sulfide hydrogen concentration is higher, and the pressure-transmission tube resistance to corrosion is had relatively high expectations; Nearly ten meters of length can't be carried out desirable preheating and postweld head treatment; Product requirement is high, and the petroleum casing pipe wall thickness only has 6.5mm thick, welds very difficult; Because its operating position is positioned at 2000 meters with lower area, pressure changes greatly, can be consistent with the working life of oil pipe in order to make pressure-transmission tube, and the corrosion resistant of weld metal and mechanical performance reach the performance of flow string oil pipe.
Summary of the invention:
The object of the present invention is to provide a kind of shell of nitrogen pressure-transmission tube used for oilfield and welding method thereof.
Shell of nitrogen pressure-transmission tube used for oilfield comprises: bottom taper reducing, be positioned at the cylindrical sleeve on taper reducing top, and be positioned at the top reducing on cylindrical sleeve top, be positioned at the capillary tube on the reducing end face of top; Between above-mentioned bottom taper reducing and inner sleeve, between bottom taper reducing and cylindrical sleeve, between cylindrical sleeve and top reducing, between top reducing and inner sleeve, between top reducing end face and capillary tube, all take welding connecting mode; Described bottom taper reducing, cylindrical sleeve, top reducing and capillary tube material are the 13Cr stainless steel.
The welding method of above-mentioned shell of nitrogen pressure-transmission tube used for oilfield, the specific implementation process is as follows:
(1) welding sequence:
First capillary tube and top reducing end face are welded before formal assembling; Weld successively again the weld seam between top reducing and inner sleeve after assembling, the weld seam between top reducing and cylindrical sleeve, the weld seam between cylindrical sleeve and bottom taper reducing, the weld seam between welding bottom taper reducing and inner sleeve at last;
(2) wlding is selected:
The weight percent content of weld metal main chemical is: Cr content is 10-20%, and Mn content is 3-8%, and Fe content is 8-12%, and all the other metals are Ni;
(3) welding procedure:
Before welding and in welding process in the inner sleeve applying argon gas, oxidized to prevent weld metal and heat affected zone, reduce its mechanical performance and decay resistance; All weld seams all adopt the TIC welding, to ensure welding quality; Adopt little standard, multi-layer multi-pass welding to utilize the welding tempering characteristics of Ni-based wlding, improves the comprehensive mechanical performance of weld metal in welding process; Select WSM315 pulse inverter type welder, welding current is the 50-60 peace; Because pipe is oversize, before welding every weld seam, first welding region is heated to about 150 degree with oxy-acetylene; Postwelding is heated to 600 degree, then slow cooling with the heating tape.
As further concrete scheme, above-mentioned wlding can be selected the MAGNA8N12 wlding of the omnipotent company of the U.S..
The present invention is with respect to the advantage of prior art:
(1) reducing surface design in bottom is tapered, the resistance when helping to reduce to go into the well.
(2) on welding sequence was selected, the present invention program can allow welding stress fully be discharged, the success that is conducive to weld.
(3) in the selection of welding material, broken normal welding theoretical, there is no to adopt the selection principle of " the low cooperation ", but selected the strength ratio mother metal to want high a lot of Ni-based wlding to weld.Selection mainly contains following reason like this: the selected Ni-based wlding of the present invention has good corrosion resistance, has superpower cracking resistance line ability and excellent cryogenic property and high-fire resistance.
Description of drawings:
Fig. 1 is structural representation of the present invention.
Fig. 2 is reducing place, top partial enlarged drawing, in figure, 1. represents top reducing end face and intercapillary weld seam, 2. represents the weld seam between top reducing and inner sleeve, 3. represents the weld seam between cylindrical sleeve and top reducing; D represents the top reducing.
Fig. 3 is taper reducing place, bottom partial enlarged drawing, in figure, 4. represents the weld seam between bottom taper reducing and cylindrical sleeve, 5. represents the weld seam between bottom taper reducing and inner sleeve; E represents bottom taper reducing.
Fig. 4 is that the present invention is along the generalized section of axis direction.
Fig. 5 is the concrete sectional drawing of Fig. 4 in embodiment 1.
Fig. 6 is the concrete sectional drawing of embodiment 1 middle and upper part reducing D.
Fig. 7 is the left view of Fig. 6.
Fig. 8 is the concrete sectional drawing of bottom taper reducing E in embodiment 1.
Fig. 9 is the left view of Fig. 8.
The specific embodiment:
Embodiment 1:
As shown in the figure, shell of nitrogen pressure-transmission tube used for oilfield comprises: bottom taper reducing, be positioned at the cylindrical sleeve on taper reducing top, and be positioned at the top reducing on cylindrical sleeve top, be positioned at the capillary tube on the reducing end face of top; Between above-mentioned bottom taper reducing and inner sleeve, between bottom taper reducing and cylindrical sleeve, between cylindrical sleeve and top reducing, between top reducing and inner sleeve, between top reducing end face and capillary tube, all take welding connecting mode; Described bottom taper reducing, cylindrical sleeve, top reducing and capillary tube material are the 13Cr stainless steel.
The welding method of above-mentioned shell of nitrogen pressure-transmission tube used for oilfield, the specific implementation process is as follows:
(1) welding sequence:
First capillary tube and top reducing end face are welded before formal assembling; Weld successively again the weld seam between top reducing and inner sleeve after assembling, the weld seam between top reducing and cylindrical sleeve, the weld seam between cylindrical sleeve and bottom taper reducing, the weld seam between welding bottom taper reducing and inner sleeve at last;
(3) wlding is selected:
Select the MAGNA8N12 wlding of the omnipotent company of the U.S..The weight percent content of weld metal main chemical is: Cr content is 10-20%, and Mn content is 3-8%, and Fe content is 8-12%, and all the other metals are Ni.
(3) welding procedure:
Before welding and in welding process in the inner sleeve applying argon gas, oxidized to prevent weld metal and heat affected zone, reduce its mechanical performance and decay resistance; All weld seams all adopt the TIG welding, to ensure welding quality; Adopt little standard, multi-layer multi-pass welding to utilize the welding tempering characteristics of MAGNA8N12 wlding, improves the comprehensive mechanical performance of weld metal in welding process; Select WSM315 pulse inverter type welder, welding current is the 50-60 peace; Because pipe is oversize, before welding every weld seam, now welding region is heated to about 150 degree with oxy-acetylene; Postwelding is heated to 600 degree, then slow cooling with the heating tape.
The welding line joint mechanical performance:
| Detect index | Detected value |
| Tensile strength | Peak 120000psi (as-welded) minimum 80000psi (as-welded) can reach 150000psi (state after cold-working) |
| Yield strength | Peak 90000psi (as-welded) minimum 50800psi (as-welded) can reach 125000psi (state after cold-working) |
| Brinell hardness | 140-215 (as-welded) can reach 300 (states after cold-working) |
| Specific heat is in 70 °F | 0.12btu/lb/°F |
| The V Charpy test is impacted numerical value | Under-320 °F, between 60-70ft and 1bs |
Joint performance can satisfy actual needs fully, carries out hydraulic pressure and air pressure detection after welding is completed, and namely detected pressures is water pressure generation 60MPA voltage stabilizing 15 minutes, beats nitrogen pressure 60MPA, voltage stabilizing 15 minutes.
Claims (3)
1. shell of nitrogen pressure-transmission tube used for oilfield, is characterized in that, comprising: bottom taper reducing, be positioned at the cylindrical sleeve on taper reducing top, and be positioned at the top reducing on cylindrical sleeve top, be positioned at the capillary tube on the reducing end face of top; Between above-mentioned bottom taper reducing and inner sleeve, between bottom taper reducing and cylindrical sleeve, between cylindrical sleeve and top reducing, between top reducing and inner sleeve, between top reducing end face and capillary tube, all take welding connecting mode; Described bottom taper reducing, cylindrical sleeve, top reducing and capillary tube material are the 13Cr stainless steel.
2. the welding method of the described shell of nitrogen pressure-transmission tube used for oilfield of claim 1, it turns to levy and is,
(1) welding sequence:
First capillary tube and top reducing end face are welded before formal assembling; Weld successively again the weld seam between top reducing and inner sleeve after assembling, the weld seam between top reducing and cylindrical sleeve, the weld seam between cylindrical sleeve and bottom taper reducing, the weld seam between welding bottom taper reducing and inner sleeve at last;
(2) wlding is selected:
The weight percent content of weld metal main chemical is: Cr content is 10-20%, and Mn content is 3-8%, and Fe content is 8-12%, and all the other metals are Ni;
(3) welding procedure:
Before welding and in welding process in the inner sleeve applying argon gas, oxidized to prevent weld metal and heat affected zone, reduce its mechanical performance and decay resistance; All weld seams all adopt the TIG welding, to ensure welding quality; Adopt little standard, multi-layer multi-pass welding to utilize the welding tempering characteristics of Ni-based wlding, improves the comprehensive mechanical performance of weld metal in welding process; Select WSM315 pulse inverter type welder, welding current is the 50-60 peace; Because pipe is oversize, before welding every weld seam, first welding region is heated to 150 degree with oxy-acetylene; Postwelding is heated to 600 degree, then slow cooling with the heating tape.
3. the welding method of shell of nitrogen pressure-transmission tube used for oilfield according to claim 2, is characterized in that, described wlding is selected the MAGNA8N12 wlding of the omnipotent company of the U.S..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100047813A CN101787881B (en) | 2009-12-30 | 2010-01-08 | Shell of nitrogen pressure-transmission tube used for oilfield and welding method thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910245207.4 | 2009-12-30 | ||
| CN200910245207 | 2009-12-30 | ||
| CN2010100047813A CN101787881B (en) | 2009-12-30 | 2010-01-08 | Shell of nitrogen pressure-transmission tube used for oilfield and welding method thereof |
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| Publication Number | Publication Date |
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| CN101787881A CN101787881A (en) | 2010-07-28 |
| CN101787881B true CN101787881B (en) | 2013-06-05 |
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| CN103643941A (en) * | 2013-11-20 | 2014-03-19 | 中国科学院力学研究所 | Pressure transferring cylinder for testing coalbed methane capillary tube |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2451735Y (en) * | 2000-11-03 | 2001-10-03 | 中国石油天然气股份有限公司 | Capillary down-hole pressure monitoring transmitter |
| CN1352383A (en) * | 2001-12-14 | 2002-06-05 | 中国石化胜利油田有限公司采油工艺研究院 | Air sac type well pressure measuring pressure transmission tube |
| CN2709638Y (en) * | 2004-07-02 | 2005-07-13 | 中国石化胜利油田有限公司采油工艺研究院 | Transmission cylinder for testing pressure of capillary tube |
| CN2851571Y (en) * | 2005-09-16 | 2006-12-27 | 中国石化胜利油田有限公司采油工艺研究院 | Capillary pressure-transmission barrel |
| CN101514627A (en) * | 2008-03-05 | 2009-08-26 | 中国科学院自动化研究所 | Remote monitoring system for oil well pressure by capillary steel pipes |
-
2010
- 2010-01-08 CN CN2010100047813A patent/CN101787881B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2451735Y (en) * | 2000-11-03 | 2001-10-03 | 中国石油天然气股份有限公司 | Capillary down-hole pressure monitoring transmitter |
| CN1352383A (en) * | 2001-12-14 | 2002-06-05 | 中国石化胜利油田有限公司采油工艺研究院 | Air sac type well pressure measuring pressure transmission tube |
| CN2709638Y (en) * | 2004-07-02 | 2005-07-13 | 中国石化胜利油田有限公司采油工艺研究院 | Transmission cylinder for testing pressure of capillary tube |
| CN2851571Y (en) * | 2005-09-16 | 2006-12-27 | 中国石化胜利油田有限公司采油工艺研究院 | Capillary pressure-transmission barrel |
| CN101514627A (en) * | 2008-03-05 | 2009-08-26 | 中国科学院自动化研究所 | Remote monitoring system for oil well pressure by capillary steel pipes |
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| Publication number | Publication date |
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| CN101787881A (en) | 2010-07-28 |
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