CN1752175A - Oil well acidification composition - Google Patents
Oil well acidification composition Download PDFInfo
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- CN1752175A CN1752175A CN 200410066634 CN200410066634A CN1752175A CN 1752175 A CN1752175 A CN 1752175A CN 200410066634 CN200410066634 CN 200410066634 CN 200410066634 A CN200410066634 A CN 200410066634A CN 1752175 A CN1752175 A CN 1752175A
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Abstract
An acidifying composition for oil well features that its main component is maleic anhydride-acrylic acid copolymer. Its advantages are high acidifying effect, long action distance, low denudation to clay and high denudation to quartz.
Description
Technical field
The present invention relates to a kind of oil well acidification composition, particularly the oil well acidification composition of using about acid treatment of oil formation in the Oil extraction.
Background technology
Crude oil generally all is imbedded in underground very dark oil reservoir the inside, and these oil reservoir great majority all are made up of sedimentogeneous rock.Sedimentogeneous rock mainly contains two kinds and has form, i.e. sandstone and limestone.Crude oil in the sandstone oil reservoir mainly is to be stored in the hole or slit of rock; Crude oil in the limestone oil reservoir mainly is stored in the crack or solution cavity of rock.With regard to world wide, the sandstone oil reservoir be crude oil mainly contain form, China mainly contains based on sandstone, the oil reservoir that people are usually said mainly also is meant sandstone (sandstone) oil reservoir.
Sandstone is by rock particles (main component sio
2), cementing matter and hole three parts form.The hole of rock is not only the container of oil storage, also is the passage of fluid flow simultaneously, and the hole major part in the rock is interconnected, but disconnected stagnant pore is also arranged.The hole of rock is many more, big more, and the connectivity between them is just good more, and the flow condition of oil, gas, water or other fluid is just good more.Have this character just because of reservoir rock, crude oil could flow to the shaft bottom at a distance from oil reservoir.
With regard to the porosity or the rate of permeation of reservoir rock, in the difference oil recovery phase in different oil district or same oil district, its numerical value differs greatly.The oil reservoir of high porosity or high permeability can fuel-displaced in large quantities or water filling, and low permeability layer is then less fuel-displaced or not fuel-displaced, and water filling is few or annotate and do not intake, and this recovery ratio of just giving the stable high yield in oil field and improving crude oil brings huge difficulty.
Oil production through more than 100 years, most of in the world at present oil fields have all entered the exploitation middle and later periods, after oil reservoir has experienced primary oil recovery and secondary oil recovery, because the decline of blowhole rate and obstruction still have the petroleum-in-place above 60% to remain in the blowhole of oil reservoir.Because oil belongs to Nonrenewable resources, so how to satisfy under the prerequisite of economic benefit, fully the recover petroleum resource becomes problem eternal in the oilfield development process.In order to recover or improve the rate of permeation of oil reservoir, the oil field generally adopts acid solution that oil reservoir is handled with the raising oil recovery factor both at home and abroad, thereby the acidifying technology has become at present oil well production increasing both at home and abroad, one of important measures of intensified injection of wells, yet, adopt conventional acidizing fluid, but exist acid solution clay dissolution rate height, low to the quartz dissolution rate, be confined to de-plugging, acid solution operating distance is short, and shortcomings such as acidifying depth as shallow can not reach effective transformation effect; Conventional acid is to the excessive corrosion of clay cement, and the destructible ma causes near wellbore formation to cave in, and initiation is shaked out, impact effect; The conventional acid corrosion is stronger, and is more serious to corrosion such as oil, string of casing.Need work out a kind of novel acid solution and solve above production problem.
The gel acid that a kind of acidifying strata is used is disclosed among the Chinese patent literature CN1061033A.This gel acid is only applicable to carbonate strata acidification of oil gas well or fracture acidizing, and concrete component comprises hydrochloric acid, is the hcl acidifying inhibiter of main component with aldehyde ketone amine condenses, tensio-active agent, water-soluble acidproof positively charged ion and water.Do not relate to sandstone formation acidifying problem in the document.
A kind of acidifying corrosion inhibitor for oil well and preparation method thereof is disclosed among the Chinese patent literature CN1163301A.It is to be raw material by naphthenic acid imidazoline diamide Soxylat A 25-7, through the hydrochloric acid quaterisation, obtains a kind of water-soluble fabulous naphthenic acid imidazoline diamide Soxylat A 25-7 quaternary ammonium salt cationic acidification corrosion inhibitor after the dilution.Unexposed acidizing effect data in the document.
Summary of the invention
Technical problem to be solved by this invention is not relate to the acidizing effect data in the conventional art or exist acid solution to clay dissolution rate height in existing use technology, low to the quartz dissolution rate, make acid solution operating distance short, problems such as acidifying depth as shallow provide a kind of new oil well acidification composition.Said composition has the clay dissolution rate low, and to quartz dissolution rate height, the acidification time is long, the characteristics that the acidifying radius is big.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of oil well acidification composition comprises following component by weight percentage:
A) 75～98% water;
B) 2～25% copolymer of maleic anhydride and acrylic acid.
In the technique scheme, the consumption preferable range of copolymer of maleic anhydride and acrylic acid is 3～15% by weight percentage, and more preferably scope is 4～10%.The souring composition preferred version is also to contain 1～10% HF in the acidizing fluid by weight percentage, and more preferably the consumption of scheme HF is 2～6%.The molecular weight of copolymer of maleic anhydride and acrylic acid is greater than 300.
Being prepared as follows of the copolymer of maleic anhydride and acrylic acid that uses among the present invention:
With maleic anhydride and vinylformic acid is monomer, is initiator with the Sodium Persulfate, is reductive agent with the sodium bisulfite, adopts water solution polymerization process, has synthesized copolymer of maleic anhydride and acrylic acid.M (maleic anhydride): m (vinylformic acid)=1: 1～2, initiator and reductive agent are respectively 4.0% and 1.9% of monomer mass, and 90 ℃ of polymeric reaction temperatures are incubated 1 hour.
Specific examples is as follows:
In four-necked bottle, add maleic anhydride 25.0 grams, Sodium Persulfate 3.0 grams, deionized water 176.6 grams, be heated to 90 ℃, make it dissolving; Sodium bisulfite 1.4 grams are dissolved in deionized water 20.0 grams, in adding dropping funnel behind the vinylformic acid 50.0 gram mixings.Polymerization temperature is controlled at (90 ± 2) ℃, solution is dripped off insulation reaction 1 hour in 25 minutes.Be cooled to 65 ℃, drip NaOH solution, be neutralized to pH=6.5～7.0, the control neutral temperature is 65～70 ℃, is cooled to 30 ℃, discharging.
Annotate: polymerization single polymerization monomer maleic anhydride and acrylic acid mass ratio are 1: 1～2; Polymericular weight is greater than 300.
The preparation method of oil well acidification composition of the present invention: the acidizing fluid component need only be got final product by institute's expense wiring solution-forming.
Among the present invention since oil well acidification composition to the corrosion ability of quartz greater than corrosion ability to clay, really played the matrix acidifying effect, and copolymer of maleic anhydride and acrylic acid is a polyprotonic acid, can fractional ionization go out hydrogen ion, the energy long duration of action enlarges the effect that the acidifying radius reaches deep acidizing in the stratum, has performances such as slow, low injury, antiscale, its corrosion rate to clay can be less than 25%, to rock (SiO
2) the corrosion rate can reach more than 30%, for oil well production increasing, intensified injection of wells, raising water flooding later stage surplus oil tap the latent power and difficultly adopt reserves, the low permeability layer producing capacity provides strong technical support, has obtained better technical effect.
The invention will be further elaborated below by embodiment.
Embodiment
[embodiment 1]
With molecular weight be respectively 310 copolymer of maleic anhydride and acrylic acid to be made into weight percent concentration be 7%, 10% and 15% and 25% souring composition, be 80 ℃ in the temperature of acidification reaction system, the reaction times is 4 hours, respectively to SiO
2Rock sample (2877 meters of well depth) carries out the test of corrosion rate, and its test-results is as follows:
| Organic phospho acid | Rock sample weight (gram) | Acidizing fluid concentration % (weight) | Acidizing fluid add-on (milliliter) | Rock sample corrosion rate |
| Copolymer of maleic anhydride and acrylic acid | 5 | 7 | 30 | 12.68 |
| Copolymer of maleic anhydride and acrylic acid | 5 | 10 | 30 | 33.78 |
| Copolymer of maleic anhydride and acrylic acid | 5 | 15 | 30 | 37.49 |
| Copolymer of maleic anhydride and acrylic acid | 5 | 30 | 30 | 51.3 |
[comparative example 1]
Mud acid is changed in acid among the embodiment 1, and its weight is composed as follows: 15%HCl+3%HF, and all the other conditions are constant, and its rock sample corrosion rate is 45.16%.
[embodiment 2]
The oil well acidification composition component is made into weight concentration is: 6% molecular weight is the oil well acidification composition of copolymer of maleic anhydride and acrylic acid+4.5%HF of 450, tests by condition and the step of embodiment 1, and its result is as follows: to quartzy (SiO
2) rock sample corrosion rate is 32.11%, is 11.94% to the clay dissolution rate.
[embodiment 3]
Organic phospho acid is made into weight concentration is: 6% molecular weight be 700 copolymer of maleic anhydride and acrylic acid+* acidizing fluid of %HF, test by condition and the step of embodiment 1, its result is as follows:
[embodiment 4]
The oil well acidification composition component is made into weight concentration is: 4% molecular weight is the souring composition of copolymer of maleic anhydride and acrylic acid+5%HF of 600, condition and step by embodiment 1 are tested, its result is as follows: quartzy corrosion rate is 32.76%, and the corrosion rate of clay is 20.87%.
[embodiment 5]
The oil well acidification composition component is made into weight concentration is: 2% molecular weight is the souring composition of copolymer of maleic anhydride and acrylic acid+5%HF of 550, condition and step by embodiment 1 are carried out erodible test, its result is as follows: quartzy corrosion rate is 31.61%, and the corrosion rate of clay is 17.45%.
[embodiment 6]
The oil well acidification composition component is made into weight concentration is: 5% molecular weight is the souring composition that 650 copolymer of maleic anhydride and acrylic acid+3.0%HCl+1.0%HF forms, condition and step by embodiment 1 are carried out erodible test, just changing temperature is 60 ℃, and its test-results is as follows:
| Souring temperature (℃) | Rock sample weight (gram) | Acidizing fluid add-on (milliliter) | Acidificatoin time (hour) | Corrosion rate (%) |
| 60 | 5.0 | 30 | 0.5 | 29.6 |
| 60 | 5.0 | 30 | 2.0 | 29.6 |
| 60 | 5.0 | 30 | 4.0 | 29.6 |
| 60 | 5.0 | 30 | 6.0 | 30.2 |
| 60 | 5.0 | 30 | 9.0 | 32.7 |
| 60 | 5.0 | 30 | 12.0 | 34.3 |
[comparative example 2]
Change the acid among the embodiment 6 into mud acid, its weight is composed as follows: 15%HCl+3%HF, and all the other conditions are constant, and its test-results is as follows:
| Souring temperature (℃) | Rock sample weight (gram) | Acidizing fluid add-on (milliliter) | Acidificatoin time (hour) | Corrosion rate (%) |
| 60 | 5.0 | 30 | 0.5 | 42 |
| 60 | 5.0 | 30 | 2.0 | 42 |
| 60 | 5.0 | 30 | 4.0 | 42 |
| 60 | 5.0 | 30 | 6.0 | 42 |
| 60 | 5.0 | 30 | 9.0 | 42 |
| 60 | 5.0 | 30 | 12.0 | 42 |
[embodiment 7]
Certain oilfield reservoir lithology is better, poor properties, ma quartz content height (content is 53～72%), conventional acidizing fluid is relatively poor at this area's effect, adopt the acidizing fluid corrosion ability stronger among the embodiment 6 to this stratum quartz, carry out the matrix transformation, obtained augmented injection effect preferably after the acidifying, average individual well daily water-injection rate is by 10.3 meters
3/ sky rises to 72.8 meters
3/ day, 62.5 meters of individual well augmented injections
3/ day, water injection intensity is by 0.507 meter
3/ day MPa rises to 5.050 meters
3/ day MPa, 220 days average effective phases, 38.3 meters of the former average daily output liquid of every mouthful of oil well of its correspondence
3, 3.2 tons of average day produce oils, average day production fluid is 46.6 meters after the acidifying
3, 5.1 tons of average day produce oils.
Claims (6)
1, a kind of oil well acidification composition comprises following component by weight percentage:
A) 75～98% water;
B) 2～25% copolymer of maleic anhydride and acrylic acid.
2,, it is characterized in that the consumption of copolymer of maleic anhydride and acrylic acid is 3～15% by weight percentage according to the described oil well acidification composition of claim 1.
3,, it is characterized in that the consumption of copolymer of maleic anhydride and acrylic acid is 4～10% by weight percentage according to the described oil well acidification composition of claim 2.
4, according to the described oil well acidification composition of claim 1, the molecular weight that it is characterized in that copolymer of maleic anhydride and acrylic acid is greater than 300.
5,, it is characterized in that also containing 1～10% HF in the composition by weight percentage according to the described oil well acidification composition of claim 1.
6,, it is characterized in that the consumption of HF is 2～6% by weight percentage according to the described oil well acidification composition of claim 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100666343A CN100352884C (en) | 2004-09-24 | 2004-09-24 | Oil well acidification composition |
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|---|---|---|---|
| CNB2004100666343A CN100352884C (en) | 2004-09-24 | 2004-09-24 | Oil well acidification composition |
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| CN1752175A true CN1752175A (en) | 2006-03-29 |
| CN100352884C CN100352884C (en) | 2007-12-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102816277A (en) * | 2012-06-29 | 2012-12-12 | 扬州润达油田化学剂有限公司 | Preparation method of polycarboxylic acid polymer for acidification |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4332688A (en) * | 1976-12-22 | 1982-06-01 | Texaco Inc. | Aqueous acid solution containing an acrylamido alkanesulfonic acid polymer |
| CN1014253B (en) * | 1988-06-08 | 1991-10-09 | 武汉市长江化工厂 | Method for improving permeability of oil-well strata and its solvent |
| CN1099764A (en) * | 1993-08-30 | 1995-03-08 | 聊城师范学院 | Method for preparing maleic acid anhydride-propenoic acid copolymer |
| CN1100130A (en) * | 1993-09-09 | 1995-03-15 | 吉林省油田管理局钻采工艺研究院 | Sensitive oil reservoir acidification treatment fluid |
| CN1072701C (en) * | 1998-07-15 | 2001-10-10 | 辽宁石油勘探局钻采工艺研究院 | Method for prepn. of composite, high efficiency and active acid for de-plugging of well |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102816277A (en) * | 2012-06-29 | 2012-12-12 | 扬州润达油田化学剂有限公司 | Preparation method of polycarboxylic acid polymer for acidification |
| CN102816277B (en) * | 2012-06-29 | 2016-05-04 | 扬州润达油田化学剂有限公司 | The preparation method of polyhydroxy polycarboxylic acid for acidifying |
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