CN104611690B - Passivating liquid for inhibiting oxygen corrosion of oil pipe, and preparation method of passivating liquid - Google Patents
Passivating liquid for inhibiting oxygen corrosion of oil pipe, and preparation method of passivating liquid Download PDFInfo
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- CN104611690B CN104611690B CN201510039069.XA CN201510039069A CN104611690B CN 104611690 B CN104611690 B CN 104611690B CN 201510039069 A CN201510039069 A CN 201510039069A CN 104611690 B CN104611690 B CN 104611690B
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Abstract
The invention belongs to the technical field of material engineering, and particularly relates to passivating liquid for inhibiting the oxygen corrosion of an oil pipe. The passivating liquid consists of the following raw materials by weight: 40-60g of ammonium molybdate, 17-25g of Cr2O3, 0.7-1.2g of phosphoric acid, 3-6g of potassium permanganate, and 1 L of water. The invention further provides a preparation method of the passivating liquid, and the preparation method comprises the following steps: adding 40-60g of the ammonium molybdate, 17-25g of the Cr2O3, 0.7-1.2g of the phosphoric acid and 3-6g of the potassium permanganate in a glass container, adding 1 L of the water, and after the raw materials are sufficiently dissolved, leaving the solution to stand for use. After the passivating liquid for inhibiting the oxygen corrosion of the oil pipe, provided by the invention, is used for passivating the oil pipe, a layer of molybdenum oxide and chromium oxide which are stably adsorbed is formed on the surface of the oil pipe, so that a basal body is effectively prevented from being corroded further. In formation water fully containing 5%O2, N2 and 5%CO2 gases, and under the condition of 25 DEG C, the average corrosion rate is reduced by about an order of magnitude than that before passivation.
Description
Technical field
The invention belongs to field of material engineering technology, and in particular to one kind suppresses oil pipe oxygen corrosion passivating solution and preparation side
Method.
Background technology
As China's onshore oil gas field exploitation enters the middle and later periods, oil well composite water cut is substantially increased, and causes oil field development
Difficulty is increased, and cost of winning is raised.Therefore, seeking a kind of technology that oil field can be kept efficiently to produce becomes the master that exploitation faces
Want problem.Air foam complex oil displacing is a creative new method for improving recovery ratio, and foam possesses in foam flooding
The feature that aquatic bubble, chance oil froth breaking, water blockoff do not block up oil is met, using foam the relative permeability of water can be reduced, therefore it can have
The hypertonic passage of effect ground closure, so as to reach oil displacement efficiency and swept volume are increased, and reduce the purpose of moisture content.Meanwhile, foam
Low-density and elastomeric property significantly reduce the mobility for driving fluid, with foaming agent as profile control agent, air as oil displacement agent, in line with
The principle of " driving when adjusting ", the dual-use function with profile control and the displacement of reservoir oil overcomes the shortcoming that air drives " has channeling ", prevents air from existing
Has channeling in high permeable layer breaks through.It is low cost, safe and reliable and act on traditional low-temperature oxidation and flow control, it is suitable for
Oil reservoir species, depth, scope it is relatively broad, be particularly suited for High water cut, serious heterogeneity, there is the oil reservoir of micro-crack.Cause
This, air injection foam production technique is very wide in the application prospect of China, particularly can further solve extra-low permeability, low
Infiltration oil reservoir exploits faced an exploitation difficult problem.
At present, Zhongyuan Oil Field air foam transfer drive technology is on the leading domestic level, by by the end of March, 2009, Crude Oil
Air foam transfer drive in field improves recovery efficiency technique, and the 8 6-8 series of strata in 12 blocks of sand three recklessly have carried out the scene examination of 4 well groups
Test, the ten thousand stere of Safety Injection air more than 370, trial zone recoverable reserves increased 4.44 ten thousand tons, well group is accumulative to increase 2960 tons of oil,
Staggered oil recovery ratio improves 3.97 percentage points.The successful Application of the technology, is to improve oil field high temperature and high salt, High water cut, serious
The recovery ratio of heterogeneous reservoir is made that new exploration, and overall technology reaches domestically leading level, wherein foam
System index, air injection safety control technology have filled up domestic blank.At present, Zhongyuan Oil Field is by Hu 7 south block, bright
15 pieces used as new testing ground.The oil field will by indoor public relations research and field test, make every effort to oil reservoir adaptability, carry
The aspects such as high oil displacement efficiency, safety control technology and corrosion protection technology obtain new progress.
Although air injection foam flooding technology field use at home, and oil displacement efficiency is significantly, while air injection bubble
The foam displacement of reservoir oil also result in the serious corrosion of oil pipe and pipe line steel, seriously govern on a large scale should for air injection foam flooding technology
With.With the large-scale promotion application of foam flooding technology, the etching problem of down-hole oil tube/sleeve pipe frequently occurs, and oil pipe/set
The replacement frequency of pipe is necessarily aggravated, and the utilization rate for improving oil pipe is urgently to be resolved hurrily.
The content of the invention
It is an object of the invention to provide a kind of suppress oil pipe oxygen corrosion passivating solution and preparation method, to improve oil pipe
Utilization rate.
Technical scheme：
One kind suppresses oil pipe oxygen corrosion passivating solution, by the material composition of following weight：Ammonium molybdate 40-60g, three oxidations two
Chromium 17-25g, phosphoric acid 0.7-1.2g, potassium permanganate 3-6g, water 1L.
The g of ammonium molybdate 50, chrome green 20g, phosphatase 11 g, potassium permanganate 5g, water 1L.
Present invention also offers suppress the preparation method of oil pipe oxygen corrosion passivating solution, by 40-60g ammonium molybdates, 17-25g
Chrome green, 0.7-1.2g phosphoric acid and 3-6g potassium permanganate add 1L water in glass container, treat that each component fully dissolves
Set aside for use afterwards.
The invention has the beneficial effects as follows：This suppression oil pipe oxygen corrosion that the present invention is provided is carried out blunt with passivating solution to oil pipe
After change is processed, oil pipe surface forms the molybdenum oxide of one layer of stable absorption and the oxidation of chromium
Thing, this layer of oxide can be effectively prevented matrix and further corrode.It is being full of 5%O2+N2+5%CO2The stratum of gas
Average corrosion rate in water under the conditions of 25 DEG C is than reducing about an order of magnitude before Passivation Treatment.
Description of the drawings
Fig. 1 is to be full of 5%O before and after oil pipe passivation2+N2+5%CO2The corrosion measured under the conditions of 25 DEG C in the stratum water of gas
Speed.
Specific embodiment
Embodiment 1：
A kind of suppression oil pipe oxygen corrosion passivating solution is present embodiments provided, by the material composition of following weight：Ammonium molybdate
40-60g, chrome green 17-25g, phosphoric acid 0.7-1.2g, potassium permanganate 3-6g, water 1L.
Preparation process, by 40-60g ammonium molybdates, 17-25g chrome greens, 0.7-1.2g phosphoric acid and 3-6g potassium permanganate
In glass container, 1L water, the set aside for use after each component fully dissolves are added.
When process is passivated to oil pipe, the above-mentioned suppression oil pipe oxygen corrosion for preparing is heated to passivating solution
85 DEG C, then oil pipe is placed in suppression oil pipe oxygen corrosion passivating solution, after 85 DEG C of constant temperature stands 2 hours, takes out oil pipe, treated
With.
Oil pipe surface forms the molybdenum oxide of one layer of stable absorption and the oxide of chromium, this layer of oxide energy after Passivation Treatment
It is effectively prevented matrix further to corrode.
Embodiment 2：
A kind of suppression oil pipe oxygen corrosion passivating solution is present embodiments provided, by the material composition of following weight：Ammonium molybdate
40g, chrome green 17g, phosphoric acid 0.7g, potassium permanganate 3g, water 1L.
When process is passivated to oil pipe, the above-mentioned suppression oil pipe oxygen corrosion for preparing is heated to passivating solution
85 DEG C, then oil pipe is placed in suppression oil pipe oxygen corrosion passivating solution, after 85 DEG C of constant temperature stands 2 hours, takes out oil pipe, treated
With.
Oil pipe surface forms the molybdenum oxide of one layer of stable absorption and the oxide of chromium, this layer of oxide energy after Passivation Treatment
It is effectively prevented matrix further to corrode.
Embodiment 3：
A kind of suppression oil pipe oxygen corrosion passivating solution is present embodiments provided, by the material group of following weight
Into：Ammonium molybdate 50g, chrome green 20g, phosphatase 11 g, potassium permanganate 5g, water 1L.
When process is passivated to oil pipe, the above-mentioned suppression oil pipe oxygen corrosion for preparing is heated to passivating solution
85 DEG C, then oil pipe is placed in suppression oil pipe oxygen corrosion passivating solution, after 85 DEG C of constant temperature stands 2 hours, takes out oil pipe, treated
With.
Oil pipe surface forms the molybdenum oxide of one layer of stable absorption and the oxide of chromium, this layer of oxide energy after Passivation Treatment
It is effectively prevented matrix further to corrode.
Embodiment 4：
A kind of suppression oil pipe oxygen corrosion passivating solution is present embodiments provided, by the material composition of following weight：Ammonium molybdate
60g, chrome green 25g, phosphatase 11 .2g, potassium permanganate 6g, water 1L.
When process is passivated to oil pipe, the above-mentioned suppression oil pipe oxygen corrosion for preparing is heated to passivating solution
85 DEG C, then oil pipe is placed in suppression oil pipe oxygen corrosion passivating solution, after 85 DEG C of constant temperature stands 2 hours, takes out oil pipe, treated
With.
Oil pipe surface forms the molybdenum oxide of one layer of stable absorption and the oxide of chromium, this layer of oxide energy after Passivation Treatment
It is effectively prevented matrix further to corrode.
The present invention is tested the corrosion rate before and after oil pipe Passivation Treatment：
The test of corrosion rate is the Tafel in the Powersuite softwares using M273A types electrochemical workstation institute band
Curve measuring and calculation gained, wherein Tafel curves test potential scope are -0.25V（With respect to OCP）— 0.25V（Relatively
OCP）, sweep speed is 0.02mV/s.Fig. 1 is the corrosion rate before and after gained passivation, it can be seen that oil after passivation
The corrosion rate of Guan Gang reduces about one
The order of magnitude.
Passivation liquid energy prepared by the present invention effectively suppresses the oxygen corrosive effect of oil pipe, J55 oil pipes being full of
5%O2+N2+5%CO2Average corrosion rate under the conditions of 25 DEG C in the stratum water of gas is 0.02mm/y, and the above-mentioned passivating solutions of Jing are blunt
The corrosion rate of oil pipe is then reduced to 0.0025mm/y after change process, and the corrosion rate after process is the 10% of before processing, corrosion
Rate reduction an order of magnitude.
The part that the present embodiment is not specifically described belongs to the common knowledge and known technology of the art, herein not
Another one describes in detail.
Exemplified as above is only the illustration to the present invention, does not constitute the restriction to protection scope of the present invention, all
It is that design same or analogous with the present invention belongs to protection scope of the present invention.
Claims (3)
1. it is a kind of to suppress oil pipe oxygen corrosion passivating solution, it is characterised in that by the material composition of following weight：Ammonium molybdate 40-
60g, chrome green 17-25g, phosphoric acid 0.7-1.2g, potassium permanganate 3-6g, water 1L.
2. one kind according to claim 1 suppresses oil pipe oxygen corrosion passivating solution, it is characterised in that：The g of ammonium molybdate 50, three
Aoxidize two chromium 20g, phosphatase 11 g, potassium permanganate 5g, water 1L.
3. it is according to claim 1 it is a kind of suppress oil pipe oxygen corrosion passivating solution preparation method, it is characterised in that will
40-60g ammonium molybdates, 17-25g chrome greens, 0.7-1.2g phosphoric acid and 3-6g potassium permanganate add 1L in glass container
Water, the set aside for use after each component fully dissolves.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510039069.XA CN104611690B (en) | 2015-01-27 | 2015-01-27 | Passivating liquid for inhibiting oxygen corrosion of oil pipe, and preparation method of passivating liquid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510039069.XA CN104611690B (en) | 2015-01-27 | 2015-01-27 | Passivating liquid for inhibiting oxygen corrosion of oil pipe, and preparation method of passivating liquid |
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| CN104611690A CN104611690A (en) | 2015-05-13 |
| CN104611690B true CN104611690B (en) | 2017-05-10 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417744A (en) * | 2011-11-24 | 2012-04-18 | 北方涂料工业研究设计院 | Phosphate-based high-temperature-resistant anti-corrosion paint and preparation method thereof |
-
2015
- 2015-01-27 CN CN201510039069.XA patent/CN104611690B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102417744A (en) * | 2011-11-24 | 2012-04-18 | 北方涂料工业研究设计院 | Phosphate-based high-temperature-resistant anti-corrosion paint and preparation method thereof |
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| CN104611690A (en) | 2015-05-13 |
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