CN101545369A - Method for alleviating corrosion of deep layer and pipeline of oilwell - Google Patents
Method for alleviating corrosion of deep layer and pipeline of oilwell Download PDFInfo
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- CN101545369A CN101545369A CN200910014856A CN200910014856A CN101545369A CN 101545369 A CN101545369 A CN 101545369A CN 200910014856 A CN200910014856 A CN 200910014856A CN 200910014856 A CN200910014856 A CN 200910014856A CN 101545369 A CN101545369 A CN 101545369A
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Abstract
The invention provides a method for alleviating the corrosion of a production well of an oil field by absorbing and discharging inhibiter by strata. The method includes the following steps: injecting the inhibiter into an oil layer from the production well; sequentially injecting selective water shutoff agent; sealing the inhibiter in the high permeability layers of the strata; and overhead displacing the injected water shutoff agent into the strata by displacing liquid. After the production of the production well is recovered, oil dispersing water can be slowly discharged outside along with the inhibiter in front of the water shutoff agent, therefore alleviating the corrosion of a pipe column of the production well, in particular the corrosion of a deep pipe column of the production well for a long time, and reducing the water content of the production well.
Description
Technical field:
The present invention relates to a kind of oil well method of inhibiting corrosion, be particularly suitable for being used for slowing down the corrosion of oil well deep layer and pipeline, and extend the expiration date.
Technical background:
Along with crude oil water content constantly rises, the producing well corrosion is more and more serious, and the problem that solves the producing well corrosion is more and more urgent.It is reported that oil and petrochemical industry have caused heavy economic losses to oil gas field because the loss that corrosion causes accounts for about 6% of the output value.In order to slow down corrosion, common way is to add liquid corrosion inhibiter and solid corrosion inhibitor in producing well at present.The liquid corrosion inhibiter is mainly thrown in by the annular space of producing well, sinks to the shaft bottom by the deadweight of corrosion inhibiter, returns out with extraction liquid, therefore all plays protective action in the place of corrosion inhibiter process.The liquid corrosion inhibiter that injects is by playing a role with disposable contact of corrosion system, but that drug concentration rises and falls is very big, and " peak valley " phenomenon is arranged, and when concentration is high, may have side effects, and causes unnecessary waste; When concentration is hanged down, not only do not have due protection effect, might accelerate corrosion on the contrary, so that can not bring into play its effect.This technology generally adopts the pre-film processing of impact type, periodic replenishment dosing to carry out according to actual conditions, calculates according to the production fluid amount of producing well to add dose, and period of validity is short, and dosing is loaded down with trivial details, and the dosing cycle was generally 10～20 days.Solid corrosion inhibitor can be deposited on the shaft bottom or leave in the tail pipe, and two kinds of structure typess of storage type and matrix formula are arranged.The corrosion inhibiter of storage type structure concentrates on internal layer, and its skin is the film of being made by macromolecular material, and this macromolecular material is generally hydrophobic.The corrosion inhibiter of matrix formula structure then is to be scattered in equably in the solid corrosion system, and its medicine can be single dispersion, also can be certain aggregated structure and be scattered in the macromolecule matrix, and medicine discharges by diffusion and collaborative high molecular degradation.But currently come, this technology remains the release control problem at solid corrosion inhibitor, and it is bigger influenced by the producing well production status.This method can obtain better protect to producing well annular space or tubing section; but the protective effect to the oil below the tail pipe, sleeve pipe is poor; cause the deep layer sleeve pipe of some old wells to decrease, overlap problems such as broken owing to cover appears in long-term corrosion; and casing failure well is ascendant trend year by year; brought rolling up of operation and turnover job amount, heavy damage the balanced flood relation in oil field, cause primary payzone to produce; the potentiality layer can't be employed, and causes the tremendous economic loss.
Summary of the invention:
The object of the present invention is to provide a kind of method of slowing down oil well deep layer and pipeline corrosion.
The object of the present invention is achieved like this, inject corrosion inhibiter from producing well earlier, inject selective water shutoff agent then, corrosion inhibiter is sealed up for safekeeping in the high permeability zone on stratum, with displacement fluid the water shutoff agent that injects is crossed again and replaced the stratum, when producing well resumes production, seal corrosion inhibiter in the stratum up for safekeeping slow output, work to slow down oil well deep layer and pipeline corrosion in a long time, specifically realize as follows:
(1) by every rice bran oil layer thickness 4～5m
3Consumption, be that 5%～20% the quaternary ammonium salt that contains is that main composite corrosion inhibitor (commodity are called BS-X) is clamp-oned the stratum from oil pipe with mass concentration.
(2) choose by the formulated frozen glue system of partially hydrolyzed polyacrylamide (PHPA), sodium dichromate, sodium sulfite and water as selective water shutoff agent, in this frozen glue system, it is water that the mass concentration of each component is respectively partially hydrolyzed polyacrylamide (PHPA) 0.2%～0.6%, sodium dichromate 0.05%～0.10%, sodium sulfite 0.10%～0.20% and surplus, and sodium dichromate and sodium sulfite are crosslinking agent;
(3) above-mentioned frozen glue system forms frozen glue in 45 ℃～75 ℃ temperature ranges, and the gelation time is controlled at 6h～24h;
(4) above-mentioned frozen glue system is pressed every rice bran oil layer thickness 4～10m
3Consumption inject the stratum;
(5) use the partially hydrolyzed polyacrylamide (PHPA) of 0.2%～0.6% (wt) to make displacement fluid, by every rice bran oil layer thickness 4～10m
3Consumption inject, the frozen glue system of having injected is crossed is replaced the stratum;
(6) opening well and making production behind the closing well 24h.
The injection rate of above-mentioned all working liquid is controlled at 10m
3In/the h.Adopt in density of corrosion inhibitor monitoring, metal lacing film, the output water evaluation corrosion mitigating effects such as total iron content analysis.
The present invention is owing to inject corrosion inhibiter from producing well earlier, inject selective water shutoff agent then, corrosion inhibiter is sealed up for safekeeping in the high permeability zone on stratum, with displacement fluid the water shutoff agent that injects is crossed again and replaced the stratum, when producing well resumes production, seal corrosion inhibiter in the stratum up for safekeeping with slow output, so can work to slow down oil well deep layer and pipeline corrosion in a long time.
Description of drawings:
Fig. 1 is the corrosion inhibiter production curve of LNXI32-49X well.
The specific embodiment:
Specifically describe the present invention below in conjunction with embodiment and accompanying drawing.
Embodiment 1: with the LNXI32-49X well is example, and its core intersection is 3.8m.It is that main composite corrosion inhibitor (commodity are called BS-X) dissolves with clear water that 1700kg is contained quaternary ammonium salt, is mixed with 10% corrosion inhibitor solution, is injected in the oil well; Then inject the 30m that uses the clear water preparation
3The frozen glue system, this frozen glue system is that 0.3% partially hydrolyzed polyacrylamide (PHPA), mass concentration are that 0.09% sodium dichromate, the sodium sulfite of mass concentration concentration 0.16% are formed by mass concentration, injects mass concentration with the clear water preparation at last and be 0.3% partially hydrolyzed polyacrylamide (PHPA) solution 20m
3As crossing displacement fluid.The injection rate of all working liquid is controlled at 10m
3In/the h.Drive a well behind the closing well 24h and resume production.Resumed production first day from driving a well, regularly collect this produced liquid in oil well, the density of corrosion inhibitor of analytic record aqueous phase is drawn the corrosion inhibiter production curve, the results are shown in accompanying drawing 1.
From the corrosion inhibiter production curve as can be seen, corrosion inhibiter is recovering to begin progressively output after oil well resumes production, and high production concentration appears at the initial stage, and mass concentration reaches 250mg/L; Output concentration falls after rise to 50mg/L rapidly subsequently, and progressively realized slowly, low concentration, long-time output discharge, output quality still reaches 15mg/L behind 100d.Because this corrosion inhibiter just has good corrosion inhibiting effect when mass concentration is 5mg/L, according to the injection rate and the production curve analysis of this well corrosion inhibiter, this well is implemented the new method of this invention, and the inhibition period of validity can reach more than the 200d.
The regular annular space of the oil well that coexists adds the liquid corrosion inhibiter and slows down the tubing and casing corrosion at the tail tube hanging solid corrosion inhibitor and compare; this working of an invention method can effectively reduce labor intensity; extend the expiration date; it is little influenced by the oil well production situation; and can play a very good protection to the oil below the tail pipe, sleeve pipe; prolong the oil well production life-span, had huge application and popularization value.
Claims (1)
1. handle up and slow down the method for oil well deep layer and pipeline corrosion in a stratum of using corrosion inhibiter, inject corrosion inhibiter from producing well earlier, inject selective water shutoff agent then, corrosion inhibiter is sealed up for safekeeping in the high permeability zone on stratum, with displacement fluid the blocking agent of injecting is crossed and replaced the stratum, when producing well resumed production, the corrosion inhibiter in the stratum was with slow output, play the effect that slows down oil well deep layer and pipeline corrosion in a long time, it is characterized in that realizing as follows:
1. by every rice bran oil layer thickness 4～5m
3Consumption, be that 5%～20% the quaternary ammonium salt that contains is that main composite corrosion inhibitor injects the stratum from oil pipe with mass concentration;
2. choose by the formulated frozen glue system of partially hydrolyzed polyacrylamide (PHPA), sodium dichromate, sodium sulfite and water as selective water shutoff agent, in this frozen glue system, it is water that the mass concentration of each component is respectively partially hydrolyzed polyacrylamide (PHPA) 0.2%～0.6%, sodium dichromate 0.05%～0.10%, sodium sulfite 0.10%～0.20% and surplus, and sodium dichromate and sodium sulfite are as crosslinking agent;
3. above-mentioned frozen glue system forms frozen glue in 45 ℃～75 ℃ scopes, the gelation time is controlled at 6h～24h;
4. above-mentioned frozen glue system is pressed every rice bran oil layer thickness 4～10m
3Consumption inject the stratum;
5. be that 0.2%～0.6% partially hydrolyzed polyacrylamide (PHPA) is made displacement fluid with mass concentration, by every rice bran oil layer thickness 4～10m
3Consumption inject, the frozen glue system of having injected is crossed is replaced the stratum, prevent that blocking agent is blocked near the pit shaft;
6. opening well and making production behind the closing well 24h;
The injection rate of above-mentioned all working liquid is controlled at 10m
3In/the h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910014856A CN101545369A (en) | 2009-04-27 | 2009-04-27 | Method for alleviating corrosion of deep layer and pipeline of oilwell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910014856A CN101545369A (en) | 2009-04-27 | 2009-04-27 | Method for alleviating corrosion of deep layer and pipeline of oilwell |
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| Publication Number | Publication Date |
|---|---|
| CN101545369A true CN101545369A (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910014856A Pending CN101545369A (en) | 2009-04-27 | 2009-04-27 | Method for alleviating corrosion of deep layer and pipeline of oilwell |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798500A (en) * | 2010-04-01 | 2010-08-11 | 中国石油大学(华东) | Plugging agent with double plugging function and filling method thereof |
| CN102816558A (en) * | 2012-09-14 | 2012-12-12 | 中国石油大学(华东) | Plugging agent for deep profile control and water plugging and preparation method thereof |
| CN102977871A (en) * | 2012-11-27 | 2013-03-20 | 唐山市金沙工贸有限公司 | Annulus protection fluid |
| CN103952130A (en) * | 2014-05-05 | 2014-07-30 | 克拉玛依市红都有限责任公司 | Temporary blocking gel for low-pressure oil-gas well and preparation method thereof |
-
2009
- 2009-04-27 CN CN200910014856A patent/CN101545369A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798500A (en) * | 2010-04-01 | 2010-08-11 | 中国石油大学(华东) | Plugging agent with double plugging function and filling method thereof |
| CN102816558A (en) * | 2012-09-14 | 2012-12-12 | 中国石油大学(华东) | Plugging agent for deep profile control and water plugging and preparation method thereof |
| CN102816558B (en) * | 2012-09-14 | 2015-03-18 | 中国石油大学(华东) | Plugging agent for deep profile control and water plugging and preparation method thereof |
| CN102977871A (en) * | 2012-11-27 | 2013-03-20 | 唐山市金沙工贸有限公司 | Annulus protection fluid |
| CN103952130A (en) * | 2014-05-05 | 2014-07-30 | 克拉玛依市红都有限责任公司 | Temporary blocking gel for low-pressure oil-gas well and preparation method thereof |
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Open date: 20090930 |