CN108441200A - Inorganic de-blocking agent and preparation method thereof - Google Patents
Inorganic de-blocking agent and preparation method thereof Download PDFInfo
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- CN108441200A CN108441200A CN201810373747.XA CN201810373747A CN108441200A CN 108441200 A CN108441200 A CN 108441200A CN 201810373747 A CN201810373747 A CN 201810373747A CN 108441200 A CN108441200 A CN 108441200A
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- inorganic
- acid
- blocking agent
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
Abstract
The invention discloses a kind of inorganic de-blocking agents and preparation method thereof, and solving existing de-plugging agent can not ensure that pit shaft is unimpeded and the technical issues of corrosion causes secondary blocking easily occurs, and belong to technical field of oil production engineering.Inorganic de-blocking agent includes the component of following parts by weight：60~80 parts of 8~12 parts of compounding acid, 0.1~1 part of cleanup additive, 1~2 part of corrosion inhibiter, 0.1~1 part of ferrous stability, 0.5~2 part of surfactant and water；Wherein, compounding acid by inorganic acid and weak ion strong acid according to 2.5:1 weight ratio is composed.The inorganic de-blocking agent is safe and environment-friendly, does not rationally generate waste liquid, and corrosion-free, compatibility is good, de-plugging stratum while de-plugging pit shaft blocks.
Description
Technical field
The invention belongs to technical field of oil production engineering, and in particular to a kind of inorganic de-blocking agent and preparation method thereof.
Background technology
Water injection well is during long-term injecting water at present, due to water quality compatibility difference and with bore, with repair, test, pipeline is damaged,
The factors such as dynamic pass stop noting, and the suspended contamination, calcium carbonate and a small amount of carbonic acid magne-scale in water are precipitated, are attached on shaft in wall,
It causes tube inner wall latus rectum to become smaller even to block.Current daily management technical way is to squeeze energy well-flushing using de-plugging agent,
And current de-plugging agent takes hydrochloric acid, hydrofluoric acid etc. more, can not ensure that pit shaft is unimpeded, and take hydrochloric acid, hydrofluoric acid de-plugging easy
The secondary precipitation of generation burn into, even destruction reservoir skeleton cause secondary blocking, can not restore the normal water filling of water injection well.
Invention content
It can not ensure that pit shaft is unimpeded the purpose of the present invention is to solve existing de-plugging agent and easily occur to corrode to cause
The technical issues of secondary blocking, provides a kind of inorganic de-blocking agent and preparation method thereof.
To achieve the goals above, the present invention provides the following technical solutions：
Inorganic de-blocking agent includes the component of following parts by weight：8~12 parts of compounding acid, 0.1~1 part of cleanup additive, corrosion inhibiter 1
60~80 parts of~2 parts, 0.1~1 part of ferrous stability, 0.5~2 part of surfactant and water；
Wherein, compounding acid by inorganic acid and weak ion strong acid according to 2.5:1 weight ratio is composed.
Further, the inorganic acid is mud acid, and wherein the mass ratio of hydrochloric acid and hydrofluoric acid is 2~3:1.
Further, the weak ion strong acid is formic acid.
Further, the cleanup additive is non-ionic polyacrylamide.
Further, the corrosion inhibiter is sodium benzoate.
Further, the ferrous stability is Na2SO3。
Further, the surfactant is SAS.
The preparation method of inorganic de-blocking agent, its step are as follows：By weight, compounding sour 8~12 parts, cleanup additive are weighed
0.1~1 part, in 0.1~1 part of addition reaction kettle of 1~2 part of corrosion inhibiter and ferrous stability, add 60~80 parts of stirrings of water, heating
To 37~40 DEG C, continue stirring 10~15 minutes, then weigh in 0.5~2 part of addition reaction kettle of surfactant, continues stirring 15
It~20 minutes, is then allowed to stand, obtains inorganic de-blocking agent.
Compared with prior art the beneficial effects of the invention are as follows：
The de-plugging agents such as existing hydrochloric acid, hydrofluoric acid have corrosivity, and compatibility is poor, is easily destroyed stratum, do not have scale removal
Function, and generate waste liquid, dangerous environmental protection.And it is long to remove water injection well for inorganic de-blocking agent provided by the invention, reasonable compatibility
The impurity such as the dirt that phase water filling is formed during making in shaft in wall keep pit shaft unimpeded.The inorganic de-blocking agent is safe and environment-friendly, closes
Reason does not generate waste liquid, and corrosion-free, compatibility is good, de-plugging stratum while de-plugging pit shaft blocks.
Specific implementation mode
In order to make those skilled in the art more fully understand technical scheme of the present invention, below in conjunction with embodiment to this
Invention is further detailed.Agents useful for same is commercial product in embodiment.Inorganic de-blocking agent described in embodiment
Voluntarily to prepare, component includes compounding acid, cleanup additive, corrosion inhibiter, ferrous stability and surfactant.
The compounding acid be developed for carbonate and silicate dual structure for oil duct, including inorganic acid and it is weak from
Sub- strong acid, inorganic acid are reacted with carbonate generation, and weak ion strong acid is reacted with silicate generation, is effectively acidified to oil duct
Cleaning.For inorganic acid using mud acid, mud acid is a kind of solid acid of strong acid together with Strong oxdiative compounding, is had very strong
It is acidified oxidation, can generate and react with carbonate, silicate, quartz and all kinds of colloid sundries in oil duct, in oil duct
Acidification cleaning is carried out, so as to the plugging removal effect for making oil duct microcrack reach, improves the flow conductivity in crack, which desilts for solution
Slurry blocks and improves the permeability on mud sandstone stratum, play the role of it is fine, in favor of water filling or fuel-displaced, while the compounding acid energy
Effectively solve the problems, such as the deep acidification of oil duct.
Work raffinate in the operation process such as the cleanup additive can help to be acidified, pressure break returns row from stratum, and of the invention helps
It arranges agent and uses non-ionic polyacrylamide, there is very low interfacial tension, generally need 8mN/m hereinafter, the absorption to stratum overcomes
May be low, it does not have an effect to other working solutions, while not generating injury to stratum.In addition, the effect of the corrosion inhibiter is to subtract
Few metal and rubber corrosion；The effect of the ferrous stability is stable metal ion valence state；The work of the surfactant
With being wetting, infiltration, emulsification, dispersion and oil removing, by reducing surface tension, wax that perforated interval and near wellbore zone are adsorbed,
Organic species tamper such as colloid, asphalitine strips down；It is acted on by molten wax viscosity reduction, by bulk or graininess tamper and water
Dissolving emulsification is conducive to tamper stratum is discharged with water flooding；Oil-in-water state is converted to by Water-In-Oil state, reduces original
The resistance of oil migration, is conducive to crude oil and well head is discharged in tamper；It is acted on by wettability reversal, by the oleophylic sex reversal of ground layer original
For hydrophily, subsequent crude oil is no longer adsorbed in surface of stratum again.
The preparation of 1 inorganic de-blocking agent of embodiment
0.1 part of 6 parts of hydrochloric acid, 2 parts of hydrofluoric acid, 0.1 part of cleanup additive, 1 part of corrosion inhibiter and ferrous stability is weighed to be added instead
It answers in kettle, adds 60 parts of stirrings of water, be warming up to 37 DEG C, continue stirring 15 minutes, then weigh 0.5 part of addition reaction kettle of surfactant
In, continue stirring 15 minutes, is then allowed to stand, obtains inorganic de-blocking agent.
The preparation of 2 inorganic de-blocking agent of embodiment
Weigh 1 part of 8 parts of hydrochloric acid, 4 parts of hydrofluoric acid, 1 part of cleanup additive, 2 parts of corrosion inhibiter and ferrous stability addition reaction kettle
In, add 80 parts of stirrings of water, is warming up to 40 DEG C, continues stirring 10 minutes, then weigh in 2 parts of addition reaction kettles of surfactant, after
Continuous stirring 15 minutes, is then allowed to stand, obtains inorganic de-blocking agent.
Comparative example 1
0.1 part of 8 parts of hydrochloric acid, 2 parts of hydrofluoric acid, 0.1 part of cleanup additive, 1 part of corrosion inhibiter and ferrous stability is weighed to be added instead
It answers in kettle, adds 60 parts of stirrings of water, be warming up to 37 DEG C, continue stirring 15 minutes, then weigh 0.5 part of addition reaction kettle of surfactant
In, continue stirring 15 minutes, is then allowed to stand, obtains inorganic de-blocking agent.
Comparative example 2
It weighs in 0.1 part of 6 parts of hydrochloric acid, 2 parts of hydrofluoric acid and ferrous stability addition reaction kettle, adds 60 parts of stirrings of water, rise
Temperature continues stirring 15 minutes, then weigh in 0.5 part of addition reaction kettle of surfactant to 37 DEG C, continues stirring 15 minutes, then
It stands, obtains inorganic de-blocking agent.
1 performance test of test example
Oil well fouling dirt sample A and dirt sample B is taken to be analyzed, wherein dirty sample A is pit shaft dirt, and mechanical performance is loose, easy
It is broken, easily remove；Dirty sample B is that pump hangs dirt, and mechanical performance is hard, hardly possible is broken, difficult removes.The composition analysis result of dirty sample A and dirty sample B are shown in Table
1。
1 dirt sample A of table and dirty sample B component analysis
Scale removal performance：With reference to the test method of SY/T 5405-1996, respectively by dirty sample A or dirt sample B be put into embodiment 1~
In 2 inorganic de-blocking agents prepared, 45 DEG C of temperature control every two hours observes dirty sample dissolving, dispersion situation, continues 48 hours.Scale removal
Energy evaluation criterion is shown in Table 2, and scale removal and Corrosion results are shown in Table 4 and table 5.
2 scale removal Performance evaluation criterion of table
| Visual method | Difference | Generally | By force |
| Descaling rate | <50% | 50%-85% | >85% |
Corrosive nature：With reference to the test method of SY/T 5405-1996, respectively by the test piece of H64 brass, the test piece of N80 steel, L64
Steel test piece and nitrile rubber test piece are put into the inorganic de-blocking agent of Examples 1 to 2 preparation, 45 DEG C of temperature control, observation one in every 24 hours
Secondary test piece corrosion condition continues 48 hours.Evaluation of Corrosion Resistance standard is shown in Table 3, and scale removal and Corrosion results are shown in Table 4 and table 5.
3 Evaluation of Corrosion Resistance standard of table
The molten dirty rate of inorganic de-blocking agent and corrosion condition (condition prepared by 4 Examples 1 to 2 of table and comparative example 1~2：45℃)
The molten dirty rate of inorganic de-blocking agent and corrosion condition (condition prepared by 5 Examples 1 to 2 of table and comparative example 1~2：45℃)
It is significant that test result shows that inorganic de-blocking agent has the oil well fouling removing based on silicate scale and carbonate scale
Effect, and cleanup additive has facilitation, corrosion inhibiter to enhance corrosion resistance scale removal.Selected compounding acid of the invention, to this
The inorganic de-blocking agent of invention has apparent synergistic effect.45 DEG C for 24 hours the molten dirty rates of r up to the molten dirty rates of 80% or more, 48hr up to 95% with
On, almost all is scattered.To sum up, the time is longer, and molten dirt effect is better.
Above certain exemplary embodiments that the present invention is only described by way of explanation, undoubtedly, for ability
The those of ordinary skill in domain without departing from the spirit and scope of the present invention can be with a variety of different modes to institute
The embodiment of description is modified.Therefore, above-described embodiment and description are regarded as illustrative in nature, and should not be construed as to this hair
The limitation of bright claims.
Claims (8)
1. inorganic de-blocking agent, which is characterized in that include the component of following parts by weight：Compounding sour 8~12 parts, cleanup additive 0.1~1
Part, 1~2 part of corrosion inhibiter, 0.1~1 part of ferrous stability, 0.5~2 part of surfactant and 60~80 parts of water；
Wherein, compounding acid by inorganic acid and weak ion strong acid according to 2.5:1 weight ratio is composed.
2. inorganic de-blocking agent as described in claim 1, which is characterized in that the inorganic acid is mud acid, wherein hydrochloric acid and hydrogen
The mass ratio of fluoric acid is 2~3:1.
3. inorganic de-blocking agent as described in claim 1, which is characterized in that the weak ion strong acid is formic acid.
4. inorganic de-blocking agent as described in claim 1, which is characterized in that the cleanup additive is non-ionic polyacrylamide.
5. inorganic de-blocking agent as described in claim 1, which is characterized in that the corrosion inhibiter is sodium benzoate.
6. inorganic de-blocking agent as described in claim 1, which is characterized in that the ferrous stability is Na2SO3。
7. inorganic de-blocking agent as described in claim 1, which is characterized in that the surfactant is SAS.
8. the preparation method of inorganic de-blocking agent as described in claim 1, which is characterized in that its step are as follows：By weight,
Weigh 0.1~1 part of 8~12 parts of compounding acid, 0.1~1 part of cleanup additive, 1~2 part of corrosion inhibiter and ferrous stability addition reaction kettle
In, add 60~80 parts of stirrings of water, is warming up to 37~40 DEG C, continues stirring 10~15 minutes, then weigh surfactant 0.5~2
In part addition reaction kettle, continues stirring 15~20 minutes, be then allowed to stand, obtain inorganic de-blocking agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810373747.XA CN108441200A (en) | 2018-04-24 | 2018-04-24 | Inorganic de-blocking agent and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810373747.XA CN108441200A (en) | 2018-04-24 | 2018-04-24 | Inorganic de-blocking agent and preparation method thereof |
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| CN108441200A true CN108441200A (en) | 2018-08-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110628405A (en) * | 2019-10-14 | 2019-12-31 | 大庆市唯品科技开发有限公司 | Composite organic acid acidification blocking remover |
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|---|---|---|---|---|
| CN102775973A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Scale removing agent applicable to alkaline-surfactant-polymer flooding and scale removing and unfreezing process |
| CN103421478A (en) * | 2013-07-04 | 2013-12-04 | 新疆科力新技术有限公司 | Complex plug removal water injection agent used for water injection well of sandstone reservoir and preparation method thereof |
| CN105482801A (en) * | 2015-11-25 | 2016-04-13 | 中国海洋石油总公司 | Oil and water well polyacid blocking remover |
-
2018
- 2018-04-24 CN CN201810373747.XA patent/CN108441200A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102775973A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Scale removing agent applicable to alkaline-surfactant-polymer flooding and scale removing and unfreezing process |
| CN103421478A (en) * | 2013-07-04 | 2013-12-04 | 新疆科力新技术有限公司 | Complex plug removal water injection agent used for water injection well of sandstone reservoir and preparation method thereof |
| CN105482801A (en) * | 2015-11-25 | 2016-04-13 | 中国海洋石油总公司 | Oil and water well polyacid blocking remover |
Non-Patent Citations (2)
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| 《油矿修井工人读本》编写小组: "《油矿修井工人读本 下册》", 31 July 1975, 石油化学工业出版社 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110628405A (en) * | 2019-10-14 | 2019-12-31 | 大庆市唯品科技开发有限公司 | Composite organic acid acidification blocking remover |
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Application publication date: 20180824 |