CN104611748A - Processing method of titanium alloy oil well pipe joint - Google Patents
Processing method of titanium alloy oil well pipe joint Download PDFInfo
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- CN104611748A CN104611748A CN201510035104.0A CN201510035104A CN104611748A CN 104611748 A CN104611748 A CN 104611748A CN 201510035104 A CN201510035104 A CN 201510035104A CN 104611748 A CN104611748 A CN 104611748A
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
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- C25D11/26—Anodisation of refractory metals or alloys based thereon
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Abstract
The invention discloses a processing method of a titanium alloy oil well pipe joint, and belongs to the technical field of metal material surface modification. The method comprises the following steps: (1) removing oil from the surface of the titanium alloy oil well pipe joint, performing ultrasonic cleaning with acetone, and carrying out drying; (2) placing the pretreated titanium alloy oil well pipe joint into a stainless steel electrolytic bath of an ultrasonic cleaner, firstly enabling the titanium alloy oil well pipe to be insulated against the stainless steel electrolytic bath, connecting the titanium alloy oil well pipe with an anode of a direct current pulsed power supply through a clamp, then connecting the stainless steel electrolytic bath of the ultrasonic cleaner with a cathode of the direct current pulsed power supply through the clamp, and adding an electrolyte; (3) switching on a power supply of the ultrasonic cleaner, starting the pulsed power supply, and keeping the processing time to be 5-15 minutes; (4) switching off the power supply, taking down the titanium alloy oil well pipe joint from the clamp, performing ultrasonic cleaning to the titanium alloy oil well pipe joint with acetone, and carrying out drying. The titanium alloy oil well pipe joint processed according to the processing method is good in corrosion resistance and abrasion resistance.
Description
Technical field
The present invention relates to a kind of working method of titanium alloy oil well pipe joint, belong to technical field of metal material surface modification.
Background technology
The survival and development of the mankind depend on the guarantee of the energy, and as one of important basic energy resource, oil and gas plays an important role in the numerous areas concerning national economy.Continuous increase to oil and gas demand in world wide, then need to develop increasing Oil/gas Well.The territorial scope of oil and gas exploitation is more and more wider, and the degree of depth is more and more darker; Becoming increasingly complex of exploitation geologic media, field conditions is more and more harsher, harsh.Oil well pipe is the primary member of oil well, and its cost accounts for 20 ~ 30 % of oil development, production cost.Corrosion and wearing and tearing very easily cause oil well pipe to lose efficacy, the safety in production of serious threat Oil/gas Well.For ensureing oil-gas field safety, efficiently development and production, the most effective way uses non-corrosive metal tubing, but non-corrosive metal contains expensive metallic element, and use in enormous quantities can increase production cost.Titanium alloy surface can generate protective passive film immediately in air or seawater, makes it to be in passive state, has excellent solidity to corrosion.In addition, titanium alloy specific tenacity is high, and the stress that deadweight produces is less, can reduce stress corrosion inclination, be applied to oil-gas mining as Novel oil well tube material in military service process.
Oil well pipe in Oil/gas Well connects with screw thread by using tube stub, and the performance of tube stub concerns the safety and reliability of structure of oil well.In view of the Service Environment feature of tube stub, adopt sufacing to give its anti-corrosion abrasion resistance simultaneously, meet service demand, increase the service life, reduce production cost tool significance.
Summary of the invention
The present invention aims to provide a kind of working method of titanium alloy oil well pipe joint, and the titanium alloy oil well pipe joint obtained has excellent anti-corrosion resistance to abrasion.
The invention provides a kind of working method of titanium alloy oil well pipe joint, comprise the following steps:
(1) titanium alloy oil well pipe joint pre-treatment: use acetone ultrasonic cleaning by after the oil removing of titanium alloy oil well pipe joint surface, and dry;
(2) titanium alloy oil well pipe joint good for pre-treatment is put into the stainless steel electrolytic groove of ultrasonic cleaning machine, first titanium alloy oil well pipe and stainless steel electrolytic slot insulation is made, and by fixture, titanium alloy oil well pipe is connected with the anode of direct current pulse power source, then be connected with the negative electrode of direct current pulse power source by the stainless steel electrolytic groove of fixture by ultrasonic cleaning machine; The electrolytic solution of 60 ~ 80 % volumes is poured in the stainless steel electrolytic groove of ultrasonic cleaning machine;
Described electrolytic solution by inorganic salt and deionized water formulated;
(3) connect the power supply of ultrasonic cleaning machine, make ultrasonic frequency maintain 20 ~ 60 kHz; Starting impulse power supply, frequency is 800-1200 Hz, and dutycycle is 5 ~ 15 %, and current density is 40 ~ 80 mA/cm
2; Process period is 5 ~ 15 min;
(4) close the power supply of ultrasonic cleaning machine, close the pulse power, titanium alloy oil well pipe joint is taken off from fixture, use acetone ultrasonic cleaning, and dry.
Further, described inorganic salt comprise at least two kinds in water glass, Sodium hexametaphosphate 99, sodium metaaluminate, Sodium Fluoride, sodium carbonate.
Further, the concentration of described sodium metaaluminate is 2 ~ 12 g/L, and the concentration of sodium carbonate is 2 ~ 6 g/L, and the concentration of Sodium hexametaphosphate 99 is 8 ~ 20 g/L, and the concentration of Sodium Fluoride is 4 ~ 8 g/L, content 15 ~ 25 g/L of water glass.
The invention provides a kind of preferred working method, comprise the following steps:
(1) titanium alloy oil well pipe joint pre-treatment: use acetone ultrasonic cleaning by after the oil removing of titanium alloy oil well pipe joint surface, and dry;
(2) titanium alloy oil well pipe joint good for pre-treatment is put into the stainless steel electrolytic groove of ultrasonic cleaning machine, first titanium alloy oil well pipe and stainless steel electrolytic slot insulation is made, and by fixture, titanium alloy oil well pipe is connected with the anode of direct current pulse power source, then be connected with the negative electrode of direct current pulse power source by the stainless steel electrolytic groove of fixture by ultrasonic cleaning machine; The electrolytic solution of 60 ~ 80 % volumes is poured in the stainless steel electrolytic groove of ultrasonic cleaning machine;
Described electrolytic solution by inorganic salt and deionized water formulated;
(3) connect the power supply of ultrasonic cleaning machine, make ultrasonic frequency maintain 40 kHz; Starting impulse power supply, frequency 800 Hz, dutycycle is 10 %, and current density is 60 mA/cm
2, process period is 5 ~ 15 min;
(4) close the power supply of ultrasonic cleaning machine, close the pulse power, titanium alloy oil well pipe joint is taken off from fixture, use acetone ultrasonic cleaning, and dry.
The invention belongs to technical field of metal material surface modification, under utilizing the TRANSIENT HIGH TEMPERATURE High Pressure produced in arc discharge, grow based on titanium oxide at titanium alloy surface, be aided with the ceramic layer of electrolyte component.
Of the present invention
beneficial effect: carry out surface treatment in liquid phase medium, be not subject to the restriction of workpiece size and shape, and be easy to realize batch production; Give the good solidity to corrosion of titanium alloy surface and resistance to abrasion simultaneously.By processing step process titanium alloy oil well pipe joint reasonable in design, the titanium alloy oil well pipe joint after process has good solidity to corrosion and resistance to abrasion.
Accompanying drawing explanation
Fig. 1 is the open circuit potential figure of the titanium alloy oil well pipe joint of untreated titanium alloy oil well pipe joint and handling duration 5 min;
Fig. 2 is the open circuit potential figure of the titanium alloy oil well pipe joint of untreated titanium alloy oil well pipe joint and handling duration 10 min;
Fig. 3 is the open circuit potential figure of the titanium alloy oil well pipe joint of untreated titanium alloy oil well pipe joint and handling duration 15 min;
Fig. 4 is the polarization curve of the titanium alloy oil well pipe joint of untreated titanium alloy oil well pipe joint and handling duration 5 min;
Fig. 5 is the polarization curve of the titanium alloy oil well pipe joint of untreated titanium alloy oil well pipe joint and handling duration 10 min;
Fig. 6 is the polarization curve of the titanium alloy oil well pipe joint of untreated titanium alloy oil well pipe joint and handling duration 15 min;
Fig. 7 is the wear weight loss figure of the titanium alloy oil well pipe joint of untreated titanium alloy oil well pipe joint and handling duration 5 min;
Fig. 8 is the wear weight loss figure of the titanium alloy oil well pipe joint of untreated titanium alloy oil well pipe joint and handling duration 10 min;
Fig. 9 is the wear weight loss figure of the titanium alloy oil well pipe joint of untreated titanium alloy oil well pipe joint and handling duration 15 min;
The open circuit potential figure of the titanium alloy oil well pipe joint in Fig. 1 in 1-embodiment 1 after duration 5 min process; The open circuit potential figure of the titanium alloy oil well pipe joint in 2-embodiment 2 after duration 5 min process; The open circuit potential figure of the titanium alloy oil well pipe joint in 3-embodiment 3 after duration 5 min process; The open circuit potential figure of 4-untreated titanium alloy oil well pipe joint;
The open circuit potential figure of the titanium alloy oil well pipe joint in Fig. 2 in 5-embodiment 1 after duration 10 min process; The open circuit potential figure of the titanium alloy oil well pipe joint in 6-embodiment 2 after duration 10 min process; The open circuit potential figure of the titanium alloy oil well pipe joint in 7-embodiment 3 after duration 10 min process; The open circuit potential figure of 8-untreated titanium alloy oil well pipe joint;
The open circuit potential figure of the titanium alloy oil well pipe joint in Fig. 3 in 9-embodiment 1 after duration 15 min process; The open circuit potential figure of the titanium alloy oil well pipe joint in 10-embodiment 2 after duration 15 min process; The open circuit potential figure of the titanium alloy oil well pipe joint in 11-embodiment 3 after duration 15 min process; The open circuit potential figure of 12-untreated titanium alloy oil well pipe joint;
The polarization curve of the titanium alloy oil well pipe joint in Fig. 4 in 13-embodiment 1 after duration 5 min process; The polarization curve of the titanium alloy oil well pipe joint in 14-embodiment 2 after duration 5 min process; The polarization curve of the titanium alloy oil well pipe joint in 15-embodiment 3 after duration 5 min process; The polarization curve of 16-untreated titanium alloy oil well pipe joint;
The polarization curve of the titanium alloy oil well pipe joint in Fig. 5 in 17-embodiment 1 after duration 10 min process; The polarization curve of the titanium alloy oil well pipe joint in 18-embodiment 2 after duration 10 min process; The polarization curve of the titanium alloy oil well pipe joint in 19-embodiment 3 after duration 10 min process; The polarization curve of 20-untreated titanium alloy oil well pipe joint;
The polarization curve of the titanium alloy oil well pipe joint in Fig. 6 in 21-embodiment 1 after duration 15 min process; The polarization curve of the titanium alloy oil well pipe joint in 22-embodiment 2 after duration 15 min process; The polarization curve of the titanium alloy oil well pipe joint in 23-embodiment 3 after duration 15 min process; The polarization curve of 24-untreated titanium alloy oil well pipe joint;
The wear weight loss of 25-untreated titanium alloy oil well pipe joint in Fig. 7; The wear weight loss of the titanium alloy oil well pipe joint in 26-embodiment 1 after duration 5 min process; The wear weight loss of the titanium alloy oil well pipe joint in 27-embodiment 2 after duration 5 min process; The wear weight loss of the titanium alloy oil well pipe joint in 28-embodiment 3 after duration 5 min process;
The wear weight loss of 29-untreated titanium alloy oil well pipe joint in Fig. 8; The wear weight loss of the titanium alloy oil well pipe joint in 30-embodiment 1 after duration 10 min process; The wear weight loss of the titanium alloy oil well pipe joint in 31-embodiment 2 after duration 10min process; The wear weight loss of the titanium alloy oil well pipe joint in 32-embodiment 3 after duration 10 min process;
The wear weight loss of 33-untreated titanium alloy oil well pipe joint in Fig. 9; The wear weight loss of the titanium alloy oil well pipe joint in 34-embodiment 1 after duration 15 min process; The wear weight loss of the titanium alloy oil well pipe joint in 35-embodiment 2 after duration 15 min process; The wear weight loss of the titanium alloy oil well pipe joint in 36-embodiment 3 after duration 15 min process;
P-open circuit potential in Fig. 1, Fig. 2, Fig. 3; T-test duration; E-corrosion potential in Fig. 4, Fig. 5, Fig. 6; I-corrosion current, G-wear weight loss in Fig. 7, Fig. 8, Fig. 9.
Embodiment
Further illustrate the present invention below by embodiment and accompanying drawing, but be not limited to following examples.
Now for Ti6Al4V titanium alloy material oil-well pipe joint, the present invention is implemented:
Embodiment 1:
The working method of titanium alloy oil well pipe joint in the present embodiment, specifically comprises the following steps:
(1) titanium alloy oil well pipe joint pre-treatment: use acetone ultrasonic cleaning by after the oil removing of titanium alloy oil well pipe joint surface, and dry;
(2) titanium alloy oil well pipe joint good for pre-treatment is put into the stainless steel electrolytic groove of ultrasonic cleaning machine, first titanium alloy oil well pipe and stainless steel electrolytic slot insulation is made, and by fixture, titanium alloy oil well pipe is connected with the anode of direct current pulse power source, then be connected with the negative electrode of direct current pulse power source by the stainless steel electrolytic groove of fixture by ultrasonic cleaning machine; The electrolytic solution of 75 % volumes is poured in the stainless steel electrolytic groove of ultrasonic cleaning machine;
The electrolyzer volume chosen in the present embodiment is 10 L, and the amount adding electrolytic solution is 7.5 L;
Electrolytic solution in the present embodiment by sodium metaaluminate, sodium carbonate and deionized water formulated, wherein the content of sodium metaaluminate is 11 g/L, and the content of sodium carbonate is 5 g/L.
(3) connect the power supply of ultrasonic cleaning machine, make ultrasonic frequency maintain 40 kHz; Starting impulse power supply, frequency 800 Hz, dutycycle 10 %, current density is 60 mA/cm
2; Process period is 5 min.
(4) close the power supply of ultrasonic cleaning machine, close the pulse power, titanium alloy oil well pipe joint is taken off from fixture, use acetone ultrasonic cleaning, and dry.
According to above-mentioned steps (1) ~ (4), two groups of parallel laboratory tests are done: process period is 10 min; Process period is 15 min.
By above-mentioned experiment, obtain the titanium alloy oil well pipe joint after three kinds of process.
Embodiment 2:
Present embodiment as different from Example 1 in step (2) electrolytic solution by Sodium hexametaphosphate 99, Sodium Fluoride, sodium metaaluminate and deionized water formulated, wherein content 18 g/L of Sodium hexametaphosphate 99, content 7 g/L of Sodium Fluoride, content 7 g/L of sodium metaaluminate, other step and parameter identical with embodiment 1.
The present embodiment done simultaneously process period be 5,10, the experiment of 15min, obtain the titanium alloy oil well pipe joint after three kinds of process.
Embodiment 3:
Present embodiment as different from Example 1 in step (2) electrolytic solution by water glass, Sodium hexametaphosphate 99, sodium metaaluminate and deionized water formulated, wherein content 22 g/L of water glass, content 11 g/L of Sodium hexametaphosphate 99, content 5 g/L of sodium metaaluminate, other step and parameter identical with embodiment 1.
The present embodiment done simultaneously process period be 5,10, the experiment of 15min, obtain the titanium alloy oil well pipe joint after three kinds of process.
Under above-mentioned processing condition, the titanium alloy oil well pipe joint of anti-corrosion abrasion resistance excellence can be obtained, by CO
2solidity to corrosion and resistance to abrasion that electro-chemical test and wear test evaluate process titanium alloy oil well pipe joint is carried out in saturation simulation oil field mining liquid.Test data is in table 1.
。
The test result provided from table 1: compared with untreated titanium alloy oil well pipe joint, titanium alloy oil well pipe joint after treatment, at CO
2higher open circuit potential and corrosion potential is shown, lower corrosion current in saturation simulation oil field mining liquid.Wear test result shows, the wear weight loss of untreated titanium alloy oil well pipe joint is the highest, and after treatment, wear weight loss amount obviously reduces titanium alloy oil well pipe joint.From the above results, after process, titanium alloy oil well pipe obtains excellent anti-corrosion abrasion resistance.
Claims (6)
1. a working method for titanium alloy oil well pipe joint, is characterized in that: comprise the following steps:
(1) titanium alloy oil well pipe joint pre-treatment: use acetone ultrasonic cleaning by after the oil removing of titanium alloy oil well pipe joint surface, and dry;
(2) titanium alloy oil well pipe joint good for pre-treatment is put into the stainless steel electrolytic groove of ultrasonic cleaning machine, first titanium alloy oil well pipe and stainless steel electrolytic slot insulation is made, and by fixture, titanium alloy oil well pipe is connected with the anode of direct current pulse power source, then be connected with the negative electrode of direct current pulse power source by the stainless steel electrolytic groove of fixture by ultrasonic cleaning machine; Electrolytic solution is poured in the stainless steel electrolytic groove of ultrasonic cleaning machine;
(3) connect the power supply of ultrasonic cleaning machine, make ultrasonic frequency maintain 20 ~ 60 kHz; Starting impulse power supply, frequency is 800-1200 Hz, and dutycycle is 5 ~ 15 %, and current density is 40 ~ 80 mA/cm
2, process period is 5 ~ 15 min;
(4) close the power supply of ultrasonic cleaning machine, close the pulse power, titanium alloy oil well pipe joint is taken off from fixture, use acetone ultrasonic cleaning, and dry.
2. the working method of titanium alloy oil well pipe joint according to claim 1, is characterized in that: described electrolytic solution by inorganic salt and deionized water formulated.
3. the working method of titanium alloy oil well pipe joint according to claim 2, is characterized in that: described inorganic salt comprise at least two kinds in water glass, Sodium hexametaphosphate 99, sodium metaaluminate, Sodium Fluoride, sodium carbonate.
4. the working method of titanium alloy oil well pipe joint according to claim 3, it is characterized in that: the concentration of described sodium metaaluminate is 2 ~ 12 g/L, the concentration of sodium carbonate is 2 ~ 6 g/L, the concentration of Sodium hexametaphosphate 99 is 8 ~ 20 g/L, the concentration of Sodium Fluoride is 4 ~ 8 g/L, content 15 ~ 25 g/L of water glass.
5. the working method of titanium alloy oil well pipe joint according to claim 1, is characterized in that: described electrolytic solution add-on is: electrolytic solution volume accounts for 60 ~ 80 long-pending % of stainless steel electrolytic cell body.
6. the working method of the titanium alloy oil well pipe joint according to any one of claim 1 ~ 5, is characterized in that: comprise the following steps:
(1) titanium alloy oil well pipe joint pre-treatment: use acetone ultrasonic cleaning by after the oil removing of titanium alloy oil well pipe joint surface, and dry;
(2) titanium alloy oil well pipe joint good for pre-treatment is put into the stainless steel electrolytic groove of ultrasonic cleaning machine, first titanium alloy oil well pipe and stainless steel electrolytic slot insulation is made, and by fixture, titanium alloy oil well pipe is connected with the anode of direct current pulse power source, then be connected with the negative electrode of direct current pulse power source by the stainless steel electrolytic groove of fixture by ultrasonic cleaning machine; The electrolytic solution of 60 ~ 80 % volumes is poured in the stainless steel electrolytic groove of ultrasonic cleaning machine;
Described electrolytic solution by inorganic salt and deionized water formulated;
(3) connect the power supply of ultrasonic cleaning machine, make ultrasonic frequency maintain 40 kHz; Starting impulse power supply, frequency 800 Hz, dutycycle is 10 %, and current density is 60 mA/cm
2, process period is 5 ~ 15 min;
(4) close the power supply of ultrasonic cleaning machine, close the pulse power, titanium alloy oil well pipe joint is taken off from fixture, use acetone ultrasonic cleaning, and dry.
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Cited By (1)
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| CN111778536A (en) * | 2020-07-22 | 2020-10-16 | 中山市三美高新材料技术有限公司 | Aluminum alloy surface compact oxidation process under constant ion gradient |
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