CN113429952B - Alkaline blocking remover, preparation method thereof and alkaline blocking removing method for near-oil well zone - Google Patents
Alkaline blocking remover, preparation method thereof and alkaline blocking removing method for near-oil well zone Download PDFInfo
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- 230000000903 blocking effect Effects 0.000 title claims abstract description 66
- 239000003129 oil well Substances 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000003921 oil Substances 0.000 claims abstract description 40
- 239000003381 stabilizer Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000010779 crude oil Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 239000004927 clay Substances 0.000 claims abstract description 12
- 239000000654 additive Substances 0.000 claims abstract description 10
- 230000000996 additive effect Effects 0.000 claims abstract description 10
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 claims abstract description 10
- 238000006073 displacement reaction Methods 0.000 claims abstract description 10
- 239000004094 surface-active agent Substances 0.000 claims abstract description 10
- 230000003628 erosive effect Effects 0.000 claims abstract description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 24
- -1 iron ion Chemical class 0.000 claims description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000001103 potassium chloride Substances 0.000 claims description 6
- 235000011164 potassium chloride Nutrition 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- SHGAZHPCJJPHSC-NUEINMDLSA-N Isotretinoin Chemical compound OC(=O)C=C(C)/C=C/C=C(C)C=CC1=C(C)CCCC1(C)C SHGAZHPCJJPHSC-NUEINMDLSA-N 0.000 claims description 4
- 229960005280 isotretinoin Drugs 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000002736 nonionic surfactant Substances 0.000 claims description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 4
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims description 3
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 125000000129 anionic group Chemical group 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000002981 blocking agent Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000004576 sand Substances 0.000 abstract description 9
- 239000011435 rock Substances 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 16
- 239000000126 substance Substances 0.000 description 13
- 230000008569 process Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical group OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000005422 blasting Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 150000007529 inorganic bases Chemical class 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- JYYOBHFYCIDXHH-UHFFFAOYSA-N carbonic acid;hydrate Chemical compound O.OC(O)=O JYYOBHFYCIDXHH-UHFFFAOYSA-N 0.000 description 1
- 229920006317 cationic polymer Polymers 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 150000007530 organic bases Chemical class 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000001814 pectin Substances 0.000 description 1
- 235000010987 pectin Nutrition 0.000 description 1
- 229920001277 pectin Polymers 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
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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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The application relates to the field of oil well blockage removal, and particularly discloses an alkaline blockage removal agent, a preparation method thereof and an alkaline blockage removal method for a near oil well zone. An alkaline blocking remover comprises alkaline earth metal hydroxide, a surfactant for oil displacement, a clay stabilizer, an iron ion stabilizer, a crude oil demulsifier, a cleanup additive and water. A preparation method of an alkaline blocking remover comprises the steps of sequentially adding and dissolving alkaline earth metal hydroxide, a surfactant for oil displacement, a clay stabilizer, an iron ion stabilizer, a crude oil demulsifier and a cleanup additive in water to prepare the alkaline blocking remover. An alkaline blockage removing method for a near oil well zone comprises the following steps: s1: injecting an alkaline blocking remover into the oil well; s2: the alkaline blocking remover erodes the oil well blockage, and the oil well blockage is drained back after the erosion is finished. The alkaline plugging removal liquid does not change a rock structure when plugging removal, sand production is not increased after plugging removal, and the problems that an oil layer is blocked in a near-wellbore area and sand production is serious after plugging removal can be solved.
Description
Technical Field
The application relates to the field of oil well blockage removal, in particular to an alkaline blockage removal agent, a preparation method thereof and an alkaline blockage removal method for a near oil well zone.
Background
In the development and production process of oil fields, the near-wellbore region of an oil layer is damaged and blocked, the yield of an oil well is seriously influenced, and even the oil well does not produce oil. The plugging removal measures of the oil layer near wellbore zone applied to the mine field are basically classified into two types: physical vibration methods and chemical methods. The physical vibration method utilizes the vibration wave action to excite the medium in the vibration field, and realizes the blockage removal of the oil layer through the actions of denudation, disintegration, capillary force reduction, Jamin effect removal and the like; the chemical method utilizes the acidic blocking remover to dissolve, dissolve and change the properties of phase interfaces and the like, and plays a role in blocking removal, restoring or improving the permeability of the near-wellbore region of an oil layer and the like.
At present, the blockage removal of the near-wellbore region of an oil layer usually adopts chemical method blockage removal and chemical method-physical vibration method combined blockage removal.
However, in the actual blockage removing process, after the blockage is removed by adopting a chemical method or a chemical method-physical vibration method, sand is produced from a part of oil wells due to acidification, a large amount of sand is produced from the stratum, the production stop and sand removal of the oil wells are caused, the production cost is increased due to frequent sand removal, and the collapse of the well wall and the scrapping of the oil wells are caused under the extremely serious condition, so that huge loss is brought to the oil field.
Disclosure of Invention
In order to avoid sand production of a stratum caused by acidizing and blocking removal of an oil well, the application provides an alkaline blocking remover, a preparation method of the alkaline blocking remover and an alkaline blocking removal method for a near oil well zone.
In a first aspect, the present application provides an alkaline blocking remover, which adopts the following technical scheme:
the alkaline blocking remover comprises the following raw materials in parts by weight: 5-25 parts of inorganic base, 0.2-0.8 part of surfactant for oil displacement, 2-5 parts of clay stabilizer, 0.1-1 part of iron ion stabilizer, 6-8 parts of crude oil demulsifier, 1-5 parts of cleanup additive and 65-80 parts of water.
By adopting the technical scheme, the cause of the blockage is as follows: in the contact of crude oil and rock, components such as asphaltene, colloid, paraffin and the like in the crude oil are adsorbed on the surfaces of rock pores and form hard rigid films, and the rigid films increase the oil flow resistance filled in the rock pores, limit the crude oil from passing through the rock pores and macroscopically show blockage.
In the blockage removing process, due to the chemical action of an interface, the alkaline blockage removing liquid is absorbed into the oil phase, the swelled oil phase destroys a rigid film on an oil-water interface, and the destroyed rigid film is solubilized to enter a water phase, so that the blockage removing purpose is achieved.
Preferably, the alkaline earth metal hydroxide is at least one selected from potassium hydroxide and sodium hydroxide.
By adopting the technical scheme, the alkaline earth metal hydroxide has high solubility in water, and is suitable for preparing alkaline blocking removers with different concentrations.
Preferably, the surfactant for oil displacement is selected from at least one of anionic sulfonate or nonionic surfactant; the anion sulfonate is selected from at least one of sodium heavy alkylbenzene sulfonate or alkylphenol polyoxyethylene sulfonate; the nonionic surfactant is fatty alcohol-polyoxyethylene ether.
By adopting the technical scheme, the adsorption attraction of a double electric layer is formed between the surfactant for oil displacement and water, and the damaged rigid film is more easily solubilized into a water phase.
Preferably, the crude oil demulsifier is at least one demulsifier TA-1031 and demulsifier SP-169. More preferably, the crude oil demulsifier is a mixture of demulsifier TA-1031 and demulsifier SP-169, and the weight ratio of the demulsifier TA-1031 to the demulsifier SP-169 is (1-4): 1. Most preferably, the weight ratio of the demulsifier TA-1031 to the demulsifier SP-169 is 3: 1.
Preferably, the iron ion stabilizer comprises at least one of ethylenediaminetetraacetic acid tetrasodium salt, acetic acid, citric acid, and isotretinoin sodium. Preferably, the iron ion stabilizer is ethylenediaminetetraacetic acid tetrasodium salt.
By adopting the technical scheme, because the oil well blockage contains more ions (such as iron ions), the iron ion stabilizer can perform a complex reaction with the iron ions, and the iron ions are prevented from being combined with the alkaline earth metal hydroxide to generate precipitation.
Preferably, the clay stabilizer is at least one selected from the group consisting of inorganic salt clay stabilizers, inorganic polynuclear polymer clay stabilizers, Gemini cationic surfactant clay stabilizers, and organic cationic polymer clay stabilizers.
Preferably, the cleanup additive is CT5-4 cleanup additive.
In a second aspect, the present application provides a method for preparing an alkaline blocking remover, which adopts the following technical scheme:
the preparation method of the alkaline blocking remover comprises the steps of sequentially adding and dissolving alkaline earth metal hydroxide, a surfactant for oil displacement, a clay stabilizer, an iron ion stabilizer, a crude oil demulsifier and a cleanup additive in water to prepare the alkaline blocking remover.
In a third aspect, the application provides an alkaline blockage removal method for a near oil well zone, which adopts the following technical scheme:
an alkaline blockage removing method for a near oil well zone comprises the following steps:
s1: injecting the alkaline blocking remover into an oil well;
s2: the alkaline blocking remover erodes the oil well blockage, and the oil well blockage is drained back after the erosion is finished.
Preferably, in step S1, the formula for calculating the amount of the alkaline blocking remover used is:
wherein, V1The volume of the liquid consumption of the alkaline blocking remover,
phi is the physical porosity of the oil layer,
d is the length of the perforation segment,
r is the perforation radius of the oil well,
r1the radius of the reservoir casing.
Preferably, in step S1, a pad fluid is injected into the oil well before the alkaline blocking remover is injected into the oil well; the pad fluid comprises, by weight, 5-15 parts of potassium chloride and 50-150 parts of water.
By adopting the technical scheme, the method is used for reducing the interfacial tension of the oil phase and the water phase, and is beneficial to the subsequent alkaline blocking remover to enter the blocked near-wellbore region oil layer.
Preferably, in step S1, after the alkaline blocking remover is injected into the oil well, a post-fluid is injected into the oil well; the postliquid comprises, by weight, 5-15 parts of potassium chloride and 50-150 parts of water.
By adopting the technical scheme, the alkaline blocking remover in the oil pipe is replaced, and the alkaline blocking remover enters the stratum to reach the treatment position.
Preferably, in step S2, the alkaline blocking remover is used in combination with physical vibration to remove the blockage during the process of removing the oil well blockage.
In summary, the present application has the following beneficial effects: the alkaline plugging removal liquid directly acts on organic oil well plugs such as asphaltene colloid and the like, the rock structure is not changed when plugging removal is carried out, sand production is not increased after plugging removal, and the problems that an oil layer is blocked in a near-wellbore area and sand production is serious after plugging removal can be solved.
Drawings
FIG. 1 is a schematic diagram of a well configuration.
Detailed Description
The present application will be described in further detail with reference to examples.
The demulsifier TA-1031 related to the application is purchased from Xian substance Hua Jueng blasting equipment, Limited liability company;
the demulsifier SP-169 is purchased from Xian substance Hua giant energy blasting equipment, Limited liability company;
the CT5-4 cleanup additive is purchased from Xian material Hua Jueng blasting apparatus, Limited liability company.
Examples of alkaline deblocking agent and determination of deblocking Rate thereof
The specific preparation method of the alkaline blocking remover comprises the following steps: sequentially adding and dissolving inorganic base/alkali metal salt, surfactant for oil displacement, clay stabilizer, iron ion stabilizer, crude oil demulsifier and cleanup additive in water to prepare the alkaline blocking remover.
The application relates to a method for measuring the blockage removal rate of an alkaline blockage removal agent, which comprises the following steps: weighing 60.0g of blocking remover, placing the blocking remover in a 100mL conical flask, adding 20.0g of spherical oil well blocking object into the conical flask, blocking the opening of the conical flask by adopting a sealing film or a conical flask plug, separating residual oil well blocking object in a certain blocking removing mode, drying the separated residual oil well blocking object, weighing the residual oil well blocking object, and calculating the blocking removing rate.
The oil well plug is from BeKTAS oil field in Turkey basin of Kazakhstan, and is taken from oil production pipe and sediment in ground oil pipeline to replace the plug of the near-wellbore area of the oil well. The well plug comprised 71.3 wt% wax, 10.02 wt% asphaltene, and 11.23 wt% pectin.
The blockage removal mode comprises standing blockage removal and standing-oscillation blockage removal; the specific operation steps of standing-shaking deblocking are as follows: standing for 10 minutes, manually shaking for 5 minutes, and sequentially and alternately performing the steps, wherein the frequency of manual shaking is 10 times/minute.
Table 1 examples 1-4 dosage tables for alkaline deblocking agents
Table 2 blockage removal rate of example 1
Table 3 blockage removal rate of example 2
Table 4 blockage removal rate of example 3
Table 5 blockage removal rate of example 4
TABLE 6 dosage tables for alkaline deblocking agents of examples 5-8
TABLE 7 blockage removal rate of example 5
Table 8 blockage removal rate of example 6
TABLE 9 deblocking Rate for example 7
TABLE 10 blockage removal rate for example 8
As can be seen from tables 1-5, the deblocking rate of the alkaline deblocking agent gradually increased with the increase of the weight percentage concentration of potassium hydroxide; compared with standing blockage removal, the blockage removal rate of standing-shaking blockage removal is remarkably improved.
As can be seen from tables 6-10, the deblocking rate of the alkaline deblocking agent gradually increased with the increase in the weight percent concentration of sodium hydroxide; compared with standing blockage removal, the blockage removal rate of standing-shaking blockage removal is remarkably improved.
As can be seen from tables 1-10, the plugging removal rates of sodium hydroxide and potassium hydroxide are not very different, but the plugging removal efficiency of potassium hydroxide is slightly better than that of sodium hydroxide.
TABLE 11 dosing schedules for alkaline deblocking agents prepared in examples 9-10
Examples 9-10 differ from example 4 in the composition of the crude demulsifier.
TABLE 12 blockage removal rate of example 9
TABLE 13 blockage removal rate for example 10
As can be seen from tables 5 and 1 to 13, compared with the single use of the demulsifier TA-1031 and the single use of the demulsifier SP-169, the crude oil demulsifier compounded by the demulsifier TA-1031 and the demulsifier SP-169 can obviously improve the blockage removal rate of the alkaline blockage remover
Example 11: in contrast to example 4, the tetrasodium salt of ethylenediaminetetraacetic acid was replaced by acetic acid.
Example 12: in contrast to example 4, the tetrasodium salt of ethylenediaminetetraacetic acid was replaced by citric acid.
Example 13: in contrast to example 4, the tetrasodium salt of ethylenediaminetetraacetic acid was replaced with sodium isotretinoin.
TABLE 14 blockage removal rate of example 11
TABLE 15 blockage removal rate of example 12
TABLE 16 blockage removal rate of example 13
As can be seen from tables 5 and 14 to 16, the blocking rate of the alkaline blocking remover was slightly improved by ethylenediaminetetraacetic acid as compared to the replacement of tetrasodium salt with acetic acid, citric acid and isotretinoin.
Table 17: plugging removal rates of comparative examples 1-4
Table 18: plugging removal rate of comparative example 1
Table 19: plugging removal rate of comparative example 2
Table 20: blockage removal rate of comparative example 3
Table 21: blockage removal rate of comparative example 4
Table 22: formulation tables for comparative examples 5 to 8
Table 23: blockage removal rate of comparative example 5
Table 24: blockage removal rate of comparative example 6
Table 25: plugging removal rate of comparative example 7
Table 26: plugging removal rate of comparative example 8
As is clear from tables 17 to 26, the use of carbonate hydroxide of an alkaline earth metal as an alkaline substance in the alkaline blocking remover is not satisfactory in the blocking removing effect.
Comparative example 9: in contrast to example 4, potassium hydroxide was replaced by ethylenediamine.
Comparative example 10: in contrast to example 4, potassium hydroxide was replaced by tetrahydrofuran.
Table 27: plugging removal rate of comparative example 9
Table 28: blockage removal rate of comparative example 10
As is clear from tables 27 to 28, the use of an organic base as the basic substance in the alkaline blocking remover is not satisfactory in the blocking removing effect.
Comparative example 11: in contrast to example 4, potassium hydroxide was replaced by concentrated hydrochloric acid.
TABLE 29 blockage removal rate of comparative example 11
As can be seen from table 29, the alkaline earth metal hydroxide in the alkaline deblocking agent of the present invention is replaced with an acidic substance for deblocking, and the deblocking effect is hardly exhibited, because the environmental system in the alkaline deblocking agent of the present invention is not suitable for the acidic substance to exhibit the deblocking effect.
Example 1 of an alkaline plug removal method for near oil well zones
An alkaline blockage removing method for a near oil well zone specifically comprises the following steps:
s1: injecting the alkaline blocking remover provided by any one of the embodiments into an oil well;
s2: then closing the well, corroding the oil well blockage by using the alkaline blocking remover under the condition of closing the well, and after the corrosion of the oil well blockage is finished, flowback;
in step S1, the formula for calculating the amount of the alkaline blocking remover used is:
wherein, V1The volume of the liquid consumption of the alkaline blocking remover,
phi is the physical porosity of the oil layer,
d is the length of the perforation segment,
r is the perforation radius of the oil well,
r1the radius of the reservoir casing.
Example 2 of an alkaline plug removal method for near-well zones
The difference from the example 1 is that in the step S2, the well closing operation is not performed, and in the process of the alkaline blocking remover eroding the oil well blockage, the physical vibration method is combined for deblocking.
Example 3 alkaline plug removal method for near oil well zone
A difference from example 1 is that, in step S1, a pad fluid is injected into the oil well before the alkaline blocking remover is injected into the oil well; injecting a post-fluid into the oil well after injecting the alkaline blocking remover into the oil well;
the pad fluid comprises potassium chloride and water in a weight ratio of 1: 10; the post liquid comprises potassium chloride and water in a weight ratio of 1: 10.
Wherein, the formula for calculating the liquid consumption of the pad fluid is as follows:
wherein, V2Is the volume of the liquid consumption of the pad liquid,
phi is the physical porosity of the oil layer,
d is the length of the perforation segment,
r is the perforation radius of the oil well,
r1the radius of the reservoir casing;
the formula for calculating the use amount of the postposition liquid is as follows:
wherein, V3The volume of the liquid consumption of the postposition liquid,
l is the length of the oil pipe which is put into the oil well,
r2is the radius of the tubing.
Example 4 alkaline plug removal method for near oil well zone
The difference from the example 3 is that in the step S2, the well closing operation is not performed, and in the process of the alkaline blocking remover eroding the oil well blockage, the physical vibration method is combined for deblocking.
Application example:
the alkaline blocking remover provided by the embodiment 4 is selected to carry out on-site blocking removal operation on an oil well, and the site is as follows: BeKTAS oilfield B-22 well in Kazakhstan, south Turkel basin.
The specific deblocking operation is as follows:
1. opening annulus, pumping front liquid to oil pipe positive circulation with discharge capacity of 0.5m3Min, the pressure is not more than 2MPa, when the oil pipe is filled with the pad fluid, the pump is stopped, and the annulus is closed;
2. the residual front liquid is injected continuously and positively, and the discharge capacity is 0.5m3Min, the pressure is not more than 5MPa, the suspension is carried out when the pressure reaches 5MPa, and the like, and the process is continued until all the materials are injected;
3. injecting alkaline blocking remover with discharge capacity of 0.5m3Min, the pressure is not more than 5MPa, the suspension is carried out when the pressure reaches 5MPa, and the like, and the process is continued until all the materials are injected;
4. and continuously injecting the post liquid. Discharge capacity of 0.5m3Min, the pressure is not more than 5MPa, the suspension is carried out when the pressure reaches 5MPa, and the like, and the process is continued until all the materials are injected;
5. the oil outlet pipe is lifted, and the oscillating stirring device is lowered to the middle position of the upper top and the lower bottom boundary of the perforation section;
6. starting an oscillating and stirring device to oscillate, wherein the stroke is the length D of a perforation section, and the number of times of flushing is 10 times/minute;
7. carrying out oscillation treatment for 4 hours, and taking out the oscillation stirring device;
8. and (4) putting the oil pump down, starting pumping and back-discharging, monitoring the change of the oral liquid, and accessing the oil pump into a production system after oil is discharged.
The crude oil yield of the oil well before the blockage removal is 21.6m3(d) 79% water content, crude oil yield 4.5m3D, working fluid level 544 m; the oil well liquid production capacity after the blockage removal is 25.4m3D, water content 46%, crude oil yield 13.7m3And d, a working fluid level 328 m.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. The alkaline blocking remover is characterized by comprising the following raw materials in parts by weight: 5-25 parts of alkaline earth metal hydroxide, 0.2-0.8 part of surfactant for oil displacement, 2-5 parts of clay stabilizer, 0.1-1 part of iron ion stabilizer, 6-8 parts of crude oil demulsifier, 1-5 parts of cleanup additive and 65-80 parts of water;
the alkaline earth metal hydroxide comprises at least one of potassium hydroxide and sodium hydroxide;
the crude oil demulsifier is a mixture of demulsifiers TA-1031 and SP-169, and the weight ratio of the demulsifiers TA-1031 to SP-169 is (1-4): 1.
2. The alkaline blocking remover according to claim 1, wherein the surfactant for oil displacement is selected from at least one of anionic sulfonate or nonionic surfactant; the anion sulfonate is selected from at least one of sodium heavy alkylbenzene sulfonate or alkylphenol polyoxyethylene sulfonate; the nonionic surfactant is fatty alcohol-polyoxyethylene ether.
3. The alkaline blocking agent according to claim 1, wherein the iron ion stabilizer comprises at least one of ethylenediaminetetraacetic acid tetrasodium salt, acetic acid, citric acid, and isotretinoin sodium.
4. A method for preparing the alkaline blocking remover according to any one of claims 1 to 3, characterized in that alkaline earth metal hydroxide, oil displacement surfactant, clay stabilizer, iron ion stabilizer, crude oil demulsifier and cleanup additive are added in sequence and dissolved in water to prepare the alkaline blocking remover.
5. An alkaline plug removal method for a near oil well zone, which is characterized by comprising the following steps:
s1: injecting the alkaline blocking remover as claimed in any one of claims 1 to 3 into an oil well;
s2: the alkaline blocking remover erodes the oil well blockage, and the oil well blockage is drained back after the erosion is finished.
6. The method for alkaline deblocking in a near-oil well zone according to claim 5, wherein in step S1, the formula for calculating the amount of the alkaline deblocking agent is:
wherein, V1The volume of the liquid consumption of the alkaline blocking remover,
phi is the physical porosity of the oil layer,
d is the length of the perforation segment,
r is the perforation radius of the oil well,
r1the radius of the reservoir casing.
7. The alkaline deblocking method for a near-wellbore zone according to claim 5, wherein in step S1, a pad fluid is injected into the well before the alkaline deblocking agent is injected into the well; the pad fluid comprises, by weight, 5-15 parts of potassium chloride and 50-150 parts of water.
8. The alkaline deblocking method for a near-oil well zone according to any one of claims 5 to 7, wherein in step S1, after injecting the alkaline deblocking agent into the oil well, a post fluid is injected into the oil well; the postliquid comprises, by weight, 5-15 parts of potassium chloride and 50-150 parts of water.
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