CN102172572B - Inner wall washing and coating corrosion resisting method for manifold pipelines in oil fields - Google Patents
Inner wall washing and coating corrosion resisting method for manifold pipelines in oil fields Download PDFInfo
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- CN102172572B CN102172572B CN 201110062387 CN201110062387A CN102172572B CN 102172572 B CN102172572 B CN 102172572B CN 201110062387 CN201110062387 CN 201110062387 CN 201110062387 A CN201110062387 A CN 201110062387A CN 102172572 B CN102172572 B CN 102172572B
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Abstract
The invention discloses an inner wall washing and coating corrosion resisting method for manifold pipelines in oil fields, which relates to the technical field of cleaning and anticorrosion treatment of the manifold pipelines in oil fields. Based on an aerodynamic principle, the method first clean dust and scale on the inner walls of pipelines by using a physical process and then perform coating anticorrosion treatment on the inner walls of the pipelines; and the method has the characteristics of complete pipeline cleaning and durable coating. The construction length at one time is about 3 kilometers. A cyclostrophic flow-method pipeline inner wall cleaning and corrosion resisting technique can be widely used in new (old) manifold pipelines and water injection pipelines in oil fields, is expected to make an important breakthrough in the field of cleaning and corrosion resisting of pipelines in oil fields, can descale and resist corrosion of small-caliber pipelines and can fill the blank in the field of cleaning and corrosion resisting of the pipelines in oil fields.
Description
Technical field
The present invention relates to cleaning, the preservative treatment technology field in oilfield technology field, particularly oil field gathering and transportation pipeline.
Background technology
At present both at home and abroad to the scale removal in the pipeline, aseptic technic, on principle, can be divided into two classes: i.e. Physical and chemical method.Concrete have chemical method (pickling etc.), vibratory drilling method (ultrasonic wave etc.), electromagnetic method (electric shock, negative electrode, magnetization etc.), lining method (intert soft, hard tube liner) and a Mechanical Method (built-in tool, robot etc.).But can pigging can the corrosion-resistant technology mainly be two large class methods again: lining method and Mechanical Method.But these two large class methods have all run into the four problems that is difficult to overcome: pipeline turning; Pipeline lightens; Pipeline is vertical; Small-bore pipeline.The flow rotation method has solved this four problems effectively.Can repair and improve into to the in-service pipeline inwall of various uses the technology of high-quality multiple tube.
The water flood recovery technology is one of domestic each elephant main method of improving oil recovery factor, and along with the growth of oilfield exploitation time, injection water quality constantly worsens, and corrodes day by day seriously, and the loss that causes makes us startling.Have in the waterflood-transmission line more than 90% is to scrap because of corrosion and scaling.Each elephant of the whole nation amounts to up to more than 1,500,000,000 meters 1,500 hundred million yuan more than to loss in this respect in the end of the year 2008.
Clean in the Jiangsu oilfield pipeline at present and be physical cleaning: the PIG high-pressure water jet; Chemical cleaning: acid, alkali, table agent alive; Composite cleaning: physical chemistry combination.Pipeline internal corrosion mainly adopts the squeezing and coating formula.But no matter adopt above technique is to clean or interior anticorrosion being difficult to gets a desired effect, and often causes not thorough, the interior anticorrosive coating film of cleaning and descaling inhomogeneous.
Summary of the invention
The object of the invention is to study the thorough scale removal of a kind of energy, is formed uniformly oil field gathering and transportation pipeline inner wall washing and the coating antiseptic method of interior anticorrosive coating film.
The present invention includes following steps:
1) blows out foreign material in the oil field gathering and transportation pipeline with compressed air;
2) mix with water with compressed air oil field gathering and transportation pipeline is purged;
3) the compressed air entrained sand particle that advances with rotation purges the oil field gathering and transportation pipeline inwall;
4) with compressed air oil field gathering and transportation pipeline is purged;
5) mix with paint thinner with compressed air the oil field gathering and transportation pipeline inwall is cleaned;
6) in oil field gathering and transportation pipeline, form whirlwind with compressed air and mix with coating, make coating be bonded in equably the oil field gathering and transportation pipeline inwall;
7) ventilate in oil field gathering and transportation pipeline with compressed air, make paint solidification.
Described sand grains is that hardness is lower than steel pipe and has water caltrop.
The present invention adopts aerodynamic principle, again inner-walls of duct is carried out film anticorrosion with physical method removing inner-walls of duct rust, dirt, can play the purpose of enhanced protection.Technique functions comes from the cyclone phenomenon of the Nature, afield, in the desert, when air-flow reaches certain speed, just form whirlwind, with sandstone, article volume heavenwards.According to the principle of this natural phenomena, the present invention is in pipeline, and artificial make " cyclone " adds the band sandstone and removes the inner-walls of duct fouling and carry out coating again and film.
Swirling eddy is through experimental results demonstrate, pneumatic phenomenon generally has three kinds of situations, curved undulation during low speed in the pipeline; Linearly move during high speed; Be during middling speed and rotatablely move.The present invention adopts aerodynamic principle, and to rotate the air-flow entrained sand particle that advances, the principle of rolling friction is removed rust deposite in the pipe, and residue advances coating with whirlwind again, makes coating uniform (rotary centrifugal force effect) be bonded in inner-walls of duct.The sand grains one of selecting is that hardness is lower than steel pipe, the 2nd, and quality small band water caltrop, thus minimum to the tube wall damage during rolling friction, and can both remove the residue in the tiny jog of inner-walls of duct, lay a solid foundation for filming.
The present invention has the pigging completeness and persistent characteristics of filming.The about 3km of one-off construction length.Swirling eddy method inner-walls of duct cleans and aseptic technic can be widely used in defeated, the filling pipe of oil field new (old) collection, to produce important breakthrough in oil field pipe cleaning and corrosion-resistant field, to the anticorrosion blank that will fill up oil field pipe cleaning and corrosion-resistant field of small-bore pipeline scale removal.
The concrete characteristics of the present invention have:
1, no matter the trend of pipeline no matter how to change namely pipeline be level, turning, vertical or tilt trend, also no matter same pipeline whether reducing (from change to greatly little or from little change to large) or have can carry out scale removal and film branched being in charge of.
2, because the present invention has realized non-excavation, need not destroy characteristics and the effect of existing facility uniqueness, construction is flexible, and efficiency of construction has improved tens times, and construction cost has then descended more than 50%.
3, the abrasive material of scale removal and inner-wall paint can multifariously be selected according to purposes and demand, have created the popularity of suitable application area.
4, the anticorrosion blank of filling up the oil field of small-bore pipeline scale removal has especially been simplified again simultaneously the recovery technique of pipeline greatly.
5, the application pipeline life forecast of swirling eddy eliminating sludge in pipe technology for coating is 15 years, with do not carry out the pipeline that scale removal films and compare, prolong 2 times service life, pipeline after simultaneously scale removal is filmed has reduced the coefficient of friction of liquid flow in the pipeline, reduced flow resistance, reduce the pressure reduction of pipeline front and back, improved injection water quality, reduced the electricity charge.
Compressed-air actuated pressure is 0.5～3MPa in the described step 1), from low to high oil field gathering and transportation pipeline is purged, until no-sundries blows out.
Step 2 of the present invention) compressed air pressure is that 2.7MPa～3MPa, flow velocity are 40m/s in.
Compressed-air actuated pressure is 2.7MPa～3MPa in the step 3), flow velocity 40m/s.
The pressure of whirlwind in oil field gathering and transportation pipeline is 2.7 MPa～3 MPa in the step 6), and gas flow is at 3.03 m
3～3.46m
3
The specific embodiment
One, is connected to an end of one section oil field gathering and transportation pipeline with air compressor machine.
Two, cleaning pipeline
Cleaning length of pipeline 575m utilizes compressed air to remove the interior foreign material of pipe, until no-sundries blows out.Purging should be from 0.5-3MPa pressure from low to high, and the foreign material of avoiding high pressure to wash away bringing stop up.The recording compressed machine is made 20m
3Air accumulator is the needed time under different pressures, the outflow situation of well head.
Three, derusting by sandblasting
1, at pressure 2.7MPa～3MPa, add water in the situation of flow velocity 40m/s oil field gathering and transportation pipeline is purged 1 time, amount of water 40kg, air outlet valve and outlet valve are opened simultaneously, and flowing water Valve is in half-open position.If pressure is lower than claimed range, need valve is in time closed operation more than after pressure gos up, continuing.
2, at pressure 2.7MPa～3MPa, add sand grains in the situation of flow velocity 40m/s to oil field gathering and transportation pipeline scale removal 3 times, add successively sand amount 40kg, 60kg, 80kg, sand grains requires: hardness is lower than steel pipe, has water caltrop.Air outlet valve is opened simultaneously with the valve that shakes out, and the valve that shakes out is in half-open position.If pressure is lower than claimed range, need valve is in time closed operation more than after pressure gos up, continuing.
3, open first air valve and drive again the sand valve, or carry out synchronously, avoid sand plug.
4, observe the descaling and derusting situation of the port of export, if having no the metal true qualities, consider to repeat above step, add greatly sand amount.Stop above operation if see the metal true qualities.
Four, pipeline cleans
Purge with compressed air first, the coating special diluting agent with some mixes the floating dust of thoroughly removing the pipeline inwall with compressed air again, has or not moisture to blow out with the way inspection outlet of estimating and gets final product.
Five, spraying
1, calculates the coating consumption by length of pipeline, press the pipeline inner surface and prepare coating in 180 g/ms (150kg), join curing agent according to the coating operation instruction, fully stir with machinery.Should spray immediately after coating stirs, avoid the coating precipitation.
2, the coating that stirs is injected hopper, the ventilation spraying.Because coating precipitates segregation easily, thus the time that the coating in-line stops unsuitable long (not above 3～5 minutes), so venting pressure at 2.7 MPa～3 MPa, gas flow is at 3.03 m
3～3.46m
3In the scope.Should comprehensively determine the spraying venting pressure and progressively improve pressure until coating sprays fully according to logical sand and rinse liquid outlet time.Check each test specimen, answer no sag, smooth without wave, smooth surface.
Six, post-purge
Should utilize immediately compressed air in pipe, to ventilate after spraying is finished, be beneficial to inner tube coating and solidify.The post-purge venting pressure is unsuitable excessive, and avoiding producing coating has the wave phenomenon, and the outlet feel has air-flow to go out to get final product.Until dry up (hand is without seal).
Claims (5)
1. an oil field gathering and transportation pipeline inner wall washing and coating antiseptic method is characterized in that may further comprise the steps:
1) blows out foreign material in the oil field gathering and transportation pipeline with compressed air;
2) mix with water with compressed air oil field gathering and transportation pipeline is purged;
3) the compressed air entrained sand particle that advances with rotation purges the oil field gathering and transportation pipeline inwall; The hardness of described sand grains is lower than steel pipe and has water caltrop;
4) with compressed air oil field gathering and transportation pipeline is purged;
5) mix with paint thinner with compressed air the oil field gathering and transportation pipeline inwall is cleaned;
6) in oil field gathering and transportation pipeline, form whirlwind with compressed air and mix with coating, make coating be bonded in equably the oil field gathering and transportation pipeline inwall;
7) ventilate in oil field gathering and transportation pipeline with compressed air, make paint solidification.
2. according to claim 1 described oil field gathering and transportation pipeline inner wall washing and coating antiseptic method is characterized in that compressed-air actuated pressure is 0.5～3MPa in the described step 1), from low to high oil field gathering and transportation pipeline are purged, until no-sundries blows out.
3. according to claim 1 described oil field gathering and transportation pipeline inner wall washing and coating antiseptic method is characterized in that described step 2) in compressed air pressure be that 2.7MPa～3MPa, flow velocity are 40m/s.
4. according to claim 1 described oil field gathering and transportation pipeline inner wall washing and coating antiseptic method is characterized in that compressed-air actuated pressure is 2.7MPa～3MPa in the described step 3), flow velocity 40m/s.
5. according to claim 1 described oil field gathering and transportation pipeline inner wall washing and coating antiseptic method is characterized in that the pressure of whirlwind in oil field gathering and transportation pipeline is 2.7 MPa～3 MPa in the described step 6), and gas flow is at 3.03 m
3～3.46m
3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110062387 CN102172572B (en) | 2011-03-16 | 2011-03-16 | Inner wall washing and coating corrosion resisting method for manifold pipelines in oil fields |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110062387 CN102172572B (en) | 2011-03-16 | 2011-03-16 | Inner wall washing and coating corrosion resisting method for manifold pipelines in oil fields |
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| Publication Number | Publication Date |
|---|---|
| CN102172572A CN102172572A (en) | 2011-09-07 |
| CN102172572B true CN102172572B (en) | 2013-01-09 |
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| CN 201110062387 Expired - Fee Related CN102172572B (en) | 2011-03-16 | 2011-03-16 | Inner wall washing and coating corrosion resisting method for manifold pipelines in oil fields |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104562228B (en) * | 2013-10-28 | 2017-09-15 | 中国石油化工股份有限公司 | The method for preventing spinning solution delivery pipe skinning |
| CN105642620A (en) * | 2014-11-13 | 2016-06-08 | 广东核电合营有限公司 | Method and device for cleaning and coating of interior of nuclear power station pipeline through aerodynamic force |
| CN106475913A (en) * | 2016-04-13 | 2017-03-08 | 吉林省天德立管道工程科技有限公司 | The rust cleaning of swirling eddy method inner-walls of duct snaking, coating antiseptic technology |
| CN108758162A (en) * | 2018-05-07 | 2018-11-06 | 安徽申能建设工程有限公司 | A kind of pipeline construction robot and its pipeline construction method |
| CN109373101A (en) * | 2018-11-12 | 2019-02-22 | 北京扬帆凯程科技有限公司 | A kind of detection of new old pipeline, reparation, anti-corrosion method |
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| US6841125B1 (en) * | 2000-09-20 | 2005-01-11 | Whi Usa, Inc. | Method and apparatus to clean and apply foamed corrosion inhibitor to ferrous surfaces |
| CN1654135A (en) * | 2005-02-28 | 2005-08-17 | 王筱均 | Method of rust cleaning, scale removing, film coating and corrosion preventing for large and middle sized pipeline inside wall |
| CN101386981A (en) * | 2007-09-12 | 2009-03-18 | 浙江工贸职业技术学院 | Casting corrosion resistant processing solution and used casting anticorrosion treatment technology thereof |
| CN101518773A (en) * | 2009-03-24 | 2009-09-02 | 李常胜 | Method and device for clearing rust-dirt and performing anticorrosion coating on metal pipelines |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07214022A (en) * | 1994-02-01 | 1995-08-15 | Osaka Gas Co Ltd | Cleaning method of resin lining water supply pipe |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6841125B1 (en) * | 2000-09-20 | 2005-01-11 | Whi Usa, Inc. | Method and apparatus to clean and apply foamed corrosion inhibitor to ferrous surfaces |
| CN1654135A (en) * | 2005-02-28 | 2005-08-17 | 王筱均 | Method of rust cleaning, scale removing, film coating and corrosion preventing for large and middle sized pipeline inside wall |
| CN101386981A (en) * | 2007-09-12 | 2009-03-18 | 浙江工贸职业技术学院 | Casting corrosion resistant processing solution and used casting anticorrosion treatment technology thereof |
| CN101518773A (en) * | 2009-03-24 | 2009-09-02 | 李常胜 | Method and device for clearing rust-dirt and performing anticorrosion coating on metal pipelines |
Non-Patent Citations (1)
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Granted publication date: 20130109 Termination date: 20160316 |