CN102120930A - Oil reservoir modification acid liquor and oil production method by using same - Google Patents
Oil reservoir modification acid liquor and oil production method by using same Download PDFInfo
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- CN102120930A CN102120930A CN2010105623975A CN201010562397A CN102120930A CN 102120930 A CN102120930 A CN 102120930A CN 2010105623975 A CN2010105623975 A CN 2010105623975A CN 201010562397 A CN201010562397 A CN 201010562397A CN 102120930 A CN102120930 A CN 102120930A
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Abstract
The invention provides an oil reservoir modification acid liquor and an oil production method by using the same, belonging to the technical field of oilfield operation. The acid liquor is prepared from 50-200 parts of phosphorous acid, 100-300 parts of ammonium nitrate, 500-1000 parts of potassium chloride, 100-300 parts of hydrochloric acid, 50-200 parts of hydrofluoric acid, 100-300 parts of formic acid, 50-200 parts of acetic acid, 50-300 parts of citric acid, 50-300 parts of organic cationic polymer clay stabilizer and 0-100 parts of water. The oil reservoir modification acid liquor is applicable to various limestone and dolomite reservoirs, and various limestone, dolomite, mud and silica cemented sandstone reservoirs. The oil reservoir modification acid liquor is suitable for various reservoirs of which the porosity lower limit is 1% and the permeability lower limit is 0.1 millidarcy. The oil reservoir modification acid liquor can effectively dissolve caulking substances in pores of various reservoirs, improve the permeability of the reservoirs, and increase the yield of the crude oil.
Description
Technical field
The present invention relates to the oil field operation technical field, specifically a kind of oil formation improvement acid solution and the method for carrying out oil production by this acid solution.
Background technology
General, oil formation improvement is to be measures such as the acidifying that the realization oil well production increasing carries out, pressure break, with regard to SHENGLI PETROLEUM AREA, the annual oil well of implementing oil formation improvement reaches 2000 mouthfuls more than.Because the complicacy of reservoir geology condition, make the success ratio of this measure less than 35%, especially at the acidifying modification measures of sandstone oil reservoir, success ratio (or being called the effective operation well) only is 10%.Its major cause is exactly that the performance and the oil bearing formation property of modification liquid do not match, not the problem that exists at oil reservoir and " suiting the remedy to the case ".
At present, mostly the oil field has only about 30% the recovery ratio of underground crude oil, still has 70% crude oil reserve to be stored in the low permeability pay.Acidifying reforming technology majority to the stratum in the oil district carries out at such oil reservoir, and purpose is by to the molten mode of stratum acid, makes oil well production increasing.But recent decades, the acidifying success ratio is less than 35%, and the pressure break success ratio only has 17%, and idle well in operation is dispersed throughout the oil district.Especially the acidifying of stopping up at clay mineral in the sandstone oil reservoir, its success ratio is lower, and this is because after hydrofluoric acid that can dissolve silicates class mineral injected reservoir, the speed of dissolving sandstone skeleton particle was greater than the speed of dissolving clay, clay mineral is not dissolving as yet, and ma at first caves in.Therefore, for a long time, Chinese scholars is devoted to study the acid (or alkali) of a kind of " uniqueness ", after making it to inject reservoir, can first dissolve clays after dissolved particles, or dissolve clays dissolved particles not only, again or the speed of dissolve clays greater than the speed of dissolved particles.
Summary of the invention
Technical assignment of the present invention is to solve the deficiencies in the prior art, the method that a kind of oil formation improvement acid solution is provided and carries out oil production by this acid solution.
Technical scheme of the present invention realizes that in the following manner this oil formation improvement acid solution includes the composition of following weight part proportioning:
Phosphorous acid 50-200 part; Ammonium nitrate 100-300 part; Repone K 500-1000 part;
Hydrochloric acid 100-300 part; Hydrofluoric acid 50-200 part; Formic acid 100-300 part;
Acetate 50-200 part; Citric acid 50-300 part;
Organic cationic polymer clay stablizer 50-300 part;
Water 0-100 part.
The another kind of proportioning of this oil formation improvement acid solution is the composition of following weight part proportioning:
Phosphorous acid 80-150 part; Ammonium nitrate 120-200 part; Repone K 600-900 part;
Hydrochloric acid 150-250 part; Hydrofluoric acid 50-200 part; Formic acid 150-300 part;
Acetate 80-160 part; Citric acid 50-200 part;
Organic cationic polymer clay stablizer 100-250 part;
Water 0-100 part.
The optimization proportioning of this oil formation improvement acid solution is the composition of following weight part proportioning:
Phosphorous acid 50-120 part; Ammonium nitrate 100-200 part; Repone K 700-1000 part;
Hydrochloric acid 150-250 part; Hydrofluoric acid 50-100 part; Formic acid 200-300 part;
Acetate 50-100 part; Citric acid 100-200 part;
Organic cationic polymer clay stablizer 100-200 part;
Water 0-100 part.
A kind of method of carrying out oil production by this oil formation improvement acid solution is: with the oil formation improvement acid solution by the acid solution pipeline connection that is provided with in the pit shaft to the pit shaft outer wall external world, after pit shaft decline is drilled into certain depth, by the acid solution pipeline oil formation improvement acid solution is discharged pit shaft, the oil formation improvement acid solution enters and acts on petroleum reservoir.
The purposes of this oil formation improvement acid solution is: this oil formation improvement acid solution can be applicable to the exploitation in oil field, gas field, also can be used for geology transformation and geological prospecting.
The beneficial effect that the present invention is compared with prior art produced is:
This oil formation improvement acid solution is basic theories such as utilization petromineralogy, oilfield chemistry, geology, oil production technology, utilize means such as formation testing, electronics, optical micro analysis device, indoor chemical simulation experiment, a kind of effective reservoir modification liquid of developing.
This oil formation improvement acid solution is suitable for Shengli Oil Field different depths, dissimilar oil formation improvement special use liquid.By applying, make 5 oily blocks 40 surplus a mouthful well obtained oil increasing effect, success ratio is near 100%.
This oil formation improvement acid solution be applicable to low-permeability carbonate reservoirs, she/deceive people stratotype sandstone reservoir, kaolinite filled sandstone reservoir, illite filled sandstone reservoir and special hill reservoir is implemented acidifying and acid fracturing transformation.
This oil formation improvement acid solution can effectively be dissolved the chink in the corresponding all kinds of reservoir pore spaces under keeping the intact situation of reservoir structure, play and improve reservoir permeability, improves the purpose of crude production rate.
The physics-chem characteristic index of this oil formation improvement acid solution: 118 ℃ of heatproofs; Withstand voltage 70MP; Ph value: 3-6; Strong partially in the corrodibility.
The scope of application of this oil formation improvement acid solution is: be suitable for all kinds of ashes, the cloud rock reservoir of 800m-3500m buried depth and ash, cloud matter, shale, all kinds of sandstone reservoirs of siliceous agglutinating are arranged; Be suitable for boundary at the bottom of the porosity 1%, at the bottom of the rate of permeation boundary in all kinds of reservoirs of 0.1 millidarcy; Be suitable for sandstone class reservoir with swelling clay (montmorillonite etc.), movability clay (kaolinite etc.), molten shallow lake property clay (chlorite etc.) filling.
Embodiment
A kind of oil formation improvement acid solution of the present invention is reached following detailed description the in detail of method work of carrying out oil production by this acid solution below in conjunction with embodiment.
Example 1:
The proportioning component of this oil formation improvement acid solution adopts:
Phosphorous acid 150kg; Ammonium nitrate 200kg; Repone K 950kg;
Hydrochloric acid 250kg; Hydrofluoric acid 180kg; Formic acid 250kg;
Acetate 80kg; Citric acid 120kg;
Organic cationic polymer clay stablizer 230kg;
Water 30kg.
A kind of method of carrying out oil production by this oil formation improvement acid solution is: with the oil formation improvement acid solution by the acid solution pipeline connection that is provided with in the pit shaft to the pit shaft outer wall external world, after pit shaft decline is drilled into certain depth, by the acid solution pipeline oil formation improvement acid solution is discharged pit shaft, the oil formation improvement acid solution enters and acts on petroleum reservoir.
The purposes of this oil formation improvement acid solution is: this oil formation improvement acid solution can be applicable to the exploitation in oil field, gas field, also can be used for geology transformation and geological prospecting.
Two sections reservoirs of certain wellblock, oil field sand, rock type are chiltern roe cloud rock.Carbonate content 50%～70% in the rock, the Lu Yuan sandy content 30%～50% of inequigranular texture, and other contains micro-breeze and shale.In the rock texture component, sand core table roe about 85%, the roe circle is made up of cryptocrystal rhombspar and calcite, filling composition in the hole mainly is the granular rhombspar of idiomorphic crystal, and have a small amount of shale to mix wherein, having chiltern is the special construction form of film for nuclear, cryptocrystal white clouds matter for circle, the granular rhombspar of idiomorphic crystal.Porosity is 5%～20%, and rate of permeation is (50～100) * 10
-3μ m
2, belong in the mesopore and ooze the reservoir type.Mix mutually with a small amount of shale owing to be the grains rhombspar of " film " shape distribution, be unfavorable for fluid migration, so the oil field can not ordinary production.When using hcl acidifying, since improper with acid concentration and control action time, make the carbonate material that forms film, circle all dissolved, skeleton structure slump, injury oil reservoir; When using soil acid acidizing, produced a large amount of Calcium Fluoride (Fluorspan) precipitation, stopped up pore throat and injure oil reservoir; During pressure break, a little less than the rhombspar degree of consolidation in the pore throat, broken up migration by high pressure fluid easily, form shutoff, also injure oil reservoir to concentration of local.
The action principle of this oil formation improvement acid solution: acid solution enters reservoir, at first can dissolve rapidly around particulate comb shelly, idiomorphism dolosparite, and along with the carrying out of dissolution process and the minimizing of hole retentate, porosity can improve 5%-20%.But the further in-depth of dissolution process, solvable degranulation involucrum one cryptocrystal cloud matter roe circle causes grain-suported framework to destroy, and porosity reduces on the contrary.Therefore, in the acidization control reaction rhythm and acid discharge in time cause close important.
Utilize this oil formation improvement acid solution to carry out the construction of on-the-spot transformation oil reservoir, three mouthfuls of wells that carry out in the first batch obtained the industry oil stream of 9.8～12t/d the same day, 16 mouthfuls of wells of the continuous construction in inherent this wellblock in month afterwards, average formation testing output 13t/d, the highest per-well production reaches 26t/d.Make this wellblock invalid well of nearly 20 oral examinations oil drop into production again.
Example 2:
The proportioning component of this oil formation improvement acid solution adopts:
Phosphorous acid 125kg; Ammonium nitrate 180kg; Repone K 700kg;
Hydrochloric acid 180kg; Hydrofluoric acid 120kg; Formic acid 200kg;
Acetate 150kg; Citric acid 180kg;
Organic cationic polymer clay stablizer 200kg;
Water 60kg.
Carry out the method for oil production with embodiment 1 by this oil formation improvement acid solution.
Three sections sandstone oil reservoirs of certain wellblock, oil field Paleogene system SHAHEJIE FORMATION, initial stage formation testing generally can obtain industry oil stream, but underproduction speed is exceedingly fast, reduce to below the industrial index in a few days, even the aneroid output.Analysis and research are found, reservoir has the characteristics of middle high porosity, hyposmosis, this is because volcanics chip ratio is big in the sand body, false assorted basic cast, chlorite and authigenic kaolinite are rarefaction half filling reservoir pore throat, cause a large amount of microporositys to grow, and the mobility of kaolinite crystal grain make reservoir permeability very poor.Simultaneously, carbonate cements is patch shape partial stowage hole, forms the ultra-low penetration glued layer.Therefore, when liquid miscarried, particulate was driven the very fast shutoff that forms at the venturi place, reduces output.
The action principle of this oil formation improvement acid solution: acid solution enters reservoir, at first can more promptly dissolve to adhere to shape chlorite, and this process only improves porosity 2%-5%, and can effectively check iron precipitate.Afterwards, acid solution can slowly be dissolved kaolinite, illite and mixed layer clay one by one, removes carbonate cements at last, finally makes volume of voids enlarge about about 15%.
Utilize this oil formation improvement acid solution that husky three sections sandstone reservoirs are implemented to transform, obtain 17t/d high yield industry oil stream, back stable yields is at 14t/d.
Example 3:
The proportioning component of this oil formation improvement acid solution adopts:
Phosphorous acid 95kg; Ammonium nitrate 160kg; Repone K 800kg;
Hydrochloric acid 200kg; Hydrofluoric acid 100kg; Formic acid 250kg;
Acetate 100kg; Citric acid 120kg;
Organic cationic polymer clay stablizer 150kg;
Water 50kg.
Carry out the method for oil production with embodiment 1 by this oil formation improvement acid solution.
Certain oil field, show of oil and gas (SO﹠G) is good.The initial stage formation testing obtains 198t/d high yield industry oil stream, day producing natural gas 17800m
3But well test data shows that oil reservoir epidermis fouling factor obtains high yield up to 9 although oil reservoir is described, still has severe contamination, and the potentiality that production capacity improves are very big.Microanalysis finds that slit system is not exclusively unimpeded in the reservoir, and crystalline mineral sees that the crack of the nearly inhomogeneous growth of borehole wall band is easy to be invaded by the drilling mud of overpopulation more.Therefore nearly well mud contamination and crystalline mineral filling slit are to cause reservoir potential to bring into play insufficient two key factors.
The action principle of this oil formation improvement acid solution: acid solution is got in the reservoir crack, and dissolving country rock carbonate material enlarges slotted wall.The gap filling thing is partly dissolved (corn spar arteries and veins), and part becomes free shape (siliceous thin brilliant particle and trichroite), disperses free impurity to discharge with operation liquid, and gap space enlarges 2-3 doubly.
Use this oil formation improvement acid solution to carry out the process program of acid fracturing transformation oil reservoir, implement the back crude production rate and increase to 1100t/d, back stable yields is at 476t/d.
Real by the typical successful implementation illustration of above-mentioned several examples, all kinds of reservoirs have extensive applicability to this oil formation improvement acid solution to the deep from superficial part to the oil field, have solved the difficult point problem that this field exists for a long time, have very high promotional value.
Claims (6)
1. oil formation improvement acid solution, it is characterized in that: this acid solution includes the composition of following weight part proportioning:
Phosphorous acid 50-200 part; Ammonium nitrate 100-300 part; Repone K 500-1000 part;
Hydrochloric acid 100-300 part; Hydrofluoric acid 50-200 part; Formic acid 100-300 part;
Acetate 50-200 part; Citric acid 50-300 part;
Organic cationic polymer clay stablizer 50-300 part;
Water 0-100 part.
2. a kind of oil formation improvement acid solution according to claim 1 is characterized in that this acid solution includes the composition of following weight part proportioning:
Phosphorous acid 80-150 part; Ammonium nitrate 120-200 part; Repone K 600-900 part;
Hydrochloric acid 150-250 part; Hydrofluoric acid 50-200 part; Formic acid 150-300 part;
Acetate 80-160 part; Citric acid 50-200 part;
Organic cationic polymer clay stablizer 100-250 part;
Water 0-100 part.
3. a kind of oil formation improvement acid solution according to claim 1 is characterized in that this acid solution includes the composition of following weight part proportioning:
Phosphorous acid 50-120 part; Ammonium nitrate 100-200 part; Repone K 700-1000 part;
Hydrochloric acid 150-250 part; Hydrofluoric acid 50-100 part; Formic acid 200-300 part;
Acetate 50-100 part; Citric acid 100-200 part;
Organic cationic polymer clay stablizer 100-200 part;
Water 0-100 part.
4. a kind of oil formation improvement acid solution according to claim 1 is characterized in that this acid solution includes the composition of following weight part proportioning:
95 parts in phosphorous acid; 160 parts in ammonium nitrate; 800 parts in Repone K;
200 parts of hydrochloric acid; 100 parts in hydrofluoric acid; 250 parts in formic acid;
100 parts of acetate; 120 parts of citric acids;
150 parts of organic cationic polymer clay stablizers;
50 parts in water.
5. method of carrying out oil production by the described a kind of oil formation improvement acid solution of claim 1, it is characterized in that: with the oil formation improvement acid solution by the acid solution pipeline connection that is provided with in the pit shaft to the pit shaft outer wall external world, after pit shaft decline is drilled into certain depth, by the acid solution pipeline oil formation improvement acid solution is discharged pit shaft, the oil formation improvement acid solution enters and acts on petroleum reservoir.
6. the purposes of the described oil formation improvement acid solution of claim 1, it is characterized in that: this oil formation improvement acid solution can be applicable to the exploitation in oil field, gas field, also can be used for geology transformation and geological prospecting.
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| CN2010105623975A CN102120930A (en) | 2010-11-29 | 2010-11-29 | Oil reservoir modification acid liquor and oil production method by using same |
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Cited By (5)
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| CN105820807A (en) * | 2015-01-08 | 2016-08-03 | 天津科林沃德石油技术有限公司 | Retarded acid suitable for acidifying and plugging removal for loose sandstone and preparation method thereof |
| CN110886592A (en) * | 2018-09-10 | 2020-03-17 | 中国石油化工股份有限公司 | Oil-water well grading corrosion deblocking method |
| CN113027418A (en) * | 2021-03-15 | 2021-06-25 | 西南石油大学 | Oil field water injection well pollution blockage removal experiment testing device and testing effect evaluation method |
| US11566161B2 (en) | 2020-01-03 | 2023-01-31 | King Fahd University Of Petroleum And Minerals | Method of removing calcium-containing water-based filter cake using a biodegradable acid solution |
| CN116333717A (en) * | 2021-12-24 | 2023-06-27 | 中国石油天然气股份有限公司 | Volcanic reservoir acidizing high-viscosity retarded acidizing agent, preparation method and application |
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| GB2404211B (en) * | 2003-07-22 | 2006-04-12 | Bj Services Co | Acidizing stimulation method using a pH buffered acid solution |
| CN101089118A (en) * | 2006-06-16 | 2007-12-19 | 长江大学 | Acidifying agent composition |
| CN101787269A (en) * | 2010-03-05 | 2010-07-28 | 西安石油大学 | Low-injury sandstone acid used for acidification technology of oil well |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105820807A (en) * | 2015-01-08 | 2016-08-03 | 天津科林沃德石油技术有限公司 | Retarded acid suitable for acidifying and plugging removal for loose sandstone and preparation method thereof |
| CN110886592A (en) * | 2018-09-10 | 2020-03-17 | 中国石油化工股份有限公司 | Oil-water well grading corrosion deblocking method |
| CN110886592B (en) * | 2018-09-10 | 2021-12-10 | 中国石油化工股份有限公司 | Oil-water well grading corrosion deblocking method |
| US11566161B2 (en) | 2020-01-03 | 2023-01-31 | King Fahd University Of Petroleum And Minerals | Method of removing calcium-containing water-based filter cake using a biodegradable acid solution |
| CN113027418A (en) * | 2021-03-15 | 2021-06-25 | 西南石油大学 | Oil field water injection well pollution blockage removal experiment testing device and testing effect evaluation method |
| CN116333717A (en) * | 2021-12-24 | 2023-06-27 | 中国石油天然气股份有限公司 | Volcanic reservoir acidizing high-viscosity retarded acidizing agent, preparation method and application |
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Application publication date: 20110713 |