CN115449356A - Self-suspended particle profile control agent and preparation method and application thereof - Google Patents
Self-suspended particle profile control agent and preparation method and application thereof Download PDFInfo
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- CN115449356A CN115449356A CN202211257069.3A CN202211257069A CN115449356A CN 115449356 A CN115449356 A CN 115449356A CN 202211257069 A CN202211257069 A CN 202211257069A CN 115449356 A CN115449356 A CN 115449356A
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- 239000002245 particle Substances 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 52
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 26
- 239000012452 mother liquor Substances 0.000 claims abstract description 25
- 235000014113 dietary fatty acids Nutrition 0.000 claims abstract description 21
- 239000000194 fatty acid Substances 0.000 claims abstract description 21
- 229930195729 fatty acid Natural products 0.000 claims abstract description 21
- 150000004665 fatty acids Chemical class 0.000 claims abstract description 20
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 239000011780 sodium chloride Substances 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 12
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 12
- 229910001415 sodium ion Inorganic materials 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 22
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical group [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 235000002639 sodium chloride Nutrition 0.000 claims description 19
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 claims description 8
- VKOBVWXKNCXXDE-UHFFFAOYSA-N icosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 claims description 8
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000010413 mother solution Substances 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 235000021357 Behenic acid Nutrition 0.000 claims description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 4
- 235000021355 Stearic acid Nutrition 0.000 claims description 4
- 229940116226 behenic acid Drugs 0.000 claims description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 4
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 4
- 235000011152 sodium sulphate Nutrition 0.000 claims description 4
- 239000008117 stearic acid Substances 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 3
- 239000005642 Oleic acid Substances 0.000 claims description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002585 base Substances 0.000 claims description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 3
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 3
- 235000021313 oleic acid Nutrition 0.000 claims description 3
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 235000017550 sodium carbonate Nutrition 0.000 claims description 3
- 239000011148 porous material Substances 0.000 abstract description 6
- 238000009825 accumulation Methods 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000002347 injection Methods 0.000 description 11
- 239000007924 injection Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 2
- 230000033558 biomineral tissue development Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- -1 fatty acid salt Chemical class 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention belongs to the technical field of profile control and water shutoff of oil fields, and particularly relates to a self-suspended particle profile control agent, and a preparation method and application thereof. The invention relates to a self-suspended particle profile control agent, which is prepared by the reaction of mother liquor and sodium ions in formation simulation water, wherein the mother liquor comprises the following components in parts by weight: 0.5-4 parts of alkali, 3-15 parts of higher fatty acid and 100 parts of water; the formation simulation water comprises 3-10 parts of sodium chloride and 100 parts of water. The self-suspending particle profile control agent has a rigid structure, is stable in property, does not deform, is easy to be trapped by a pore throat and forms accumulation and detention to generate large-area bridge blockage, and has better blocking capability than the traditional flexible particles.
Description
Technical Field
The invention belongs to the technical field of profile control and water shutoff of oil fields, and particularly relates to a self-suspended particle profile control agent, and a preparation method and application thereof.
Background
At present, the commonly used profile control agent for domestic oil fields is mainly phenolic resin or Cr 3+ The polymer gel used as the cross-linking agent has severe gelling conditions, and when the polymer gel is influenced by the shearing action of a ground flow or a porous medium and the high temperature and high mineralization of a reservoir, the gelling effect is poor or even no gelling is caused. In addition, the cost of the chemical agent is high, and the injection process flow is complex, so that the application scale is greatly limited. Inorganic gel is used as a general profile control and water shutoff material and is applied to oil fields earlier, such as profile control by a traditional water glass-calcium chloride double-liquid method, but the silicate gel generated by the method is unstable in property, is easy to flocculate and generate precipitates, blocks a shaft and a sieve tube, and cannot realize large-dose injection. In order to solve the defects of the prior art, a novel profile control system needs to be developed.
Disclosure of Invention
The invention provides a self-suspending particle profile control agent, and a preparation method and application thereof, aiming at the problems of high medicament cost, poor adaptability, short validity period, poor injectability and the like of the existing profile control agent.
Specifically, in a first aspect, the self-suspending particle profile control agent provided by the invention is prepared by reacting a mother solution with sodium ions in formation simulation water, wherein the mother solution comprises the following components in parts by weight: 0.5-4 parts of alkali, 3-15 parts of higher fatty acid and 100 parts of water; the formation simulation water comprises 3-10 parts of salt and 100 parts of water.
The self-suspending particle profile control agent comprises the following mother liquor in parts by weight: 0.5-1.5 parts of alkali, 4-9 parts of higher fatty acid and 100 parts of water.
The self-suspending particle profile control agent further comprises: 3-12 parts of alcohol.
In the self-suspending particle profile control agent, the alkali is potassium hydroxide; the higher fatty acids include: one or more of arachidic acid, behenic acid, stearic acid and oleic acid; the salt in the formation-simulated water comprises: sodium chloride, sodium sulfate, sodium carbonate, sodium bicarbonate; the alcohol comprises: ethanol, ethylene glycol, propanol.
In a second aspect, the invention provides a preparation method of the self-suspending particle profile control agent, which comprises the following steps:
(1) Sequentially adding alkali and higher fatty acid into water according to a ratio, heating and stirring to obtain mother liquor;
(2) And slowly dropwise adding the mother solution into the stratum simulation water to obtain the self-suspended particle profile control agent.
According to the preparation method of the self-suspending particle profile control agent, the heating temperature is 95-98 ℃, the stirring speed is 550-600r/min, and the stirring time is 3-4 hours.
In the preparation method of the self-suspending particle profile control agent, the concentration of the mother solution is 1500-2000mg/L; the concentration of the formation simulation water is 4000-8000mg/L.
In the preparation method of the self-suspending particle profile control agent, the particle size of self-suspending particles in the self-suspending particle profile control agent is 3.5-16 mu m, and the suspension time is 3-4 hours.
In a third aspect, the invention also provides an application of the self-suspending particle profile control agent in near wellbore zone profile control operation.
The technical scheme of the invention has the following beneficial effects:
(1) The self-suspending particle profile control agent changes the widely existing sodium ion sources in injected water into valuable substances, converts the valuable substances into the useful components of the profile control agent, and reduces the cost of the agent;
(2) The self-suspending particle profile control agent can be naturally suspended in water, a carrying fluid or a dispersing agent is not required to be added, the types of related agents are few, a single-liquid method online injection process can be adopted, and the process is relatively simple;
(3) The self-suspending particle profile control agent has a rigid structure, is stable in property, does not deform, is easy to be trapped by a pore throat and forms accumulation and detention to generate large-area bridge blockage, and has better blocking capability than the traditional flexible particles;
(4) Compared with the existing gel profile control agent and inorganic profile control agent, the self-suspending particle profile control agent has the advantages of low cost, good injectability, strong plugging capability, wide application range and simple process flow.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 shows the particle size of the self-suspending particulate profile control agent prepared in example 1;
FIG. 2 shows the particle size of the self-suspending particulate profile control agent prepared in example 2;
FIG. 3 shows the particle size of the self-suspending particulate profile control agent prepared in example 3;
FIG. 4 shows the particle size of the self-suspending particulate profile control agent prepared in example 4;
figure 5 shows the seepage characteristics of self-suspended particles compared to flexible particles.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
The terms "the," "said," "an," and "an" as used herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item. The terms "preferred", "more preferred", and the like, refer to embodiments of the invention that may provide certain benefits under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.
The traditional inorganic profile control (flooding) system usually utilizes calcium and magnesium ions in oil field production water or adopts a 'two-liquid method' to supplement calcium ions to form an inorganic gel plugging agent, but the concentrations of the calcium and magnesium ions in different blocks are greatly different, and the 'two-liquid method' injection mode can generate flocculent precipitates in the ground flow, block a shaft and a sieve tube, and can not realize the injection of large dosage, so that the application of the inorganic gel system is limited. The pre-crosslinked expanded particles show good plugging capability in indoor experiments, but the solubility of the pre-crosslinked expanded particles in production water is poor in field application, and the particle size is not easy to control, so that the injectability is poor, and the oil displacement effect is poor.
The invention develops a chemical agent capable of being injected on line, which can react with sodium ions in water after contacting with formation water to generate a rigid particle blocking agent with a self-suspension function, namely, particles can be naturally suspended in water (without adding carrier fluid or dispersing agent) and then enter a porous medium along with injected water. In the initial stage of injection, the particles have small initial particle size and good dispersibility, so that the particles can pass through a well bore and a screen pipe without blockage. After entering a reservoir, rigid particles are stable in property and do not deform, and after being trapped by a pore throat, the rigid particles form a large-area bridge plug through continuous accumulation and detention, can effectively plug a high permeable layer or a large pore passage, and is suitable for profile control operation in a near wellbore area.
Specifically, the self-suspending particle profile control agent provided by the invention is prepared by the reaction of mother liquor and sodium ions in formation simulation water, wherein the mother liquor comprises the following components in parts by weight: 0.5-4 parts of alkali, 3-15 parts of higher fatty acid and 100 parts of water, wherein the stratum simulation water comprises 3-10 parts of salt and 100 parts of water.
Preferably, the mother liquor comprises the following components in parts by weight: 0.5-1.5 parts of alkali, 4-9 parts of higher fatty acid and 100 parts of water.
In some preferred embodiments, the self-suspending particulate profile control agent of the present invention further comprises, in weight percent: 3 to 12 parts (preferably 4 to 5 parts) of an alcohol, whereby the solubility of the higher fatty acid in water is improved.
In some preferred embodiments, the base is potassium hydroxide.
In some preferred embodiments, the salt in the formation simulating water comprises sodium chloride, sodium sulfate, sodium carbonate and sodium bicarbonate, wherein the weight parts of the sodium sulfate, the sodium carbonate and the sodium bicarbonate are small and negligible.
In some preferred embodiments, the higher fatty acids include: one or more of arachidic acid, behenic acid, stearic acid, oleic acid, preferably behenic acid and stearic acid and arachidic acid.
In further preferred embodiments, the alcohol comprises: ethanol, ethylene glycol or propanol, preferably ethanol.
Through detection, the self-suspending particle profile control agent is a rigid particle with the particle size of micron grade, can form a bridge blocking effect in pores, effectively blocks a high permeable layer or a large pore path, and is suitable for profile control operation in a near-wellbore area. In addition, in the injection process, the particles can be naturally suspended in water, a carrying fluid or a dispersing agent is not required to be added, a single-liquid method online injection process can be adopted, and the flow is relatively simple.
In another aspect, the invention provides a method for preparing a self-suspending particle profile control agent, comprising the following steps:
(1) Sequentially adding alkali and higher fatty acid into water according to a ratio, heating and stirring to obtain mother liquor.
Wherein the alkali and the higher fatty acid can be saponified to form a fatty acid salt and water.
Preferably, the heating temperature is 95-98 ℃, the stirring speed is 550-600r/min, and the stirring time is 3-4 hours.
Preferably, ethanol is added to the water before the base and higher fatty acid are added.
(2) And slowly dripping the prepared mother solution into the stratum simulation water.
It is further preferred that the concentration of the added mother liquor is not more than 2000mg/L (preferably 1500-2000 mg/L). When the dropping concentration of the mother liquor is too fast, local concentration is too high, and the generated particles are not easy to suspend or disperse. When the mother liquor is added at a concentration of more than 2000mg/L, the particle size of the produced particles is not easy to control.
Preferably, the formation simulation water is Bohai sea oil field formation simulation water, wherein the concentration of sodium chloride is about 3000-10000mg/L, and the concentration of other ions is not considered.
The practice shows that the self-suspending particles prepared by the method have the particle size of 3.5-16 mu m and the suspension time of 3-4 hours at 50-75 ℃.
In another aspect, the invention also provides the application of the self-suspending particle profile control agent in profile control operation of a near wellbore area.
The self-suspending particle profile control agent can be directly injected into a stratum during the use process.
The invention directly injects the self-suspended particle mother liquor into the stratum, so that the sodium ion sources widely existing in the injected water are changed into valuable things, and the valuable things are converted into the useful components of the profile control agent, thereby effectively reducing the cost of the agent.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions. The starting materials used in the following examples are all conventionally commercially available.
Example 1
0.5g of potassium hydroxide and 3g of higher fatty acid are sequentially added into 100g of clear water, stirred for 3-4h at 90 ℃ to prepare milky viscous mother liquor, and the mother liquor is slowly dripped into sodium chloride aqueous solution (prepared by deionized water, wherein the concentration of sodium chloride is 5000 pm) to obtain 'self-suspending' particles. The particle size is about 15.9 μm (as shown in figure 1), and can be suspended for 3-4h at 50-75 deg.C.
Example 2
0.5g of potassium hydroxide and 4g of higher fatty acid are sequentially added into 100g of clear water, stirred for 3-4h at 90 ℃ to prepare milky viscous mother liquor, and the mother liquor is slowly dripped into sodium chloride aqueous solution (prepared by deionized water, wherein the concentration of sodium chloride is 5000 pm) to obtain 'self-suspending' particles. The particle size is about 7.1 μm (as shown in figure 2), and can be suspended for 3-4h at 50-75 deg.C.
Example 3
0.5g of potassium hydroxide, 5g of ethanol and 3g of higher fatty acid are sequentially added into 100g of clear water, stirred for 3-4h at 90 ℃ to prepare milky viscous mother liquor, and the mother liquor is slowly dripped into sodium chloride aqueous solution (prepared by deionized water, wherein the concentration of sodium chloride is 5000 pm) to obtain self-suspending particles. The diameter is about 4.5 μm (as shown in figure 3), and can suspend for 3-4h at 50-75 ℃.
Example 4
0.5g of potassium hydroxide, 5g of ethanol and 4g of higher fatty acid are sequentially added into 100g of clear water, stirred for 3-4h at 90 ℃ to prepare milky viscous mother liquor, and the mother liquor is slowly dripped into sodium chloride aqueous solution (prepared by deionized water, wherein the concentration of sodium chloride is 5000 pm) to obtain self-suspending particles. The particle size is about 3.8 μm (as shown in figure 4), and can be suspended for 3-4h at 50-75 deg.C.
Example 5
The "self-suspending" particles formulated in example 2 were injected into an artificial core at a permeability of 8000mD and a pressure change as shown in FIG. 5. It can be seen that the pressure rise is not obvious in the injection process, but the pressure rise is obvious in the subsequent water-driving process, the residual resistance coefficient is higher than the resistance coefficient, and good deep flow characteristics are shown.
Performance testing
The contrast experiment and the result analysis of the effect of the self-suspended particles and the traditional flexible particle seepage characteristics are as follows:
the materials used were: self-suspending particles at a concentration of 2000ppm and a particle size of about 5.8 μm; traditional flexible particles, concentration 2000ppm, particle size 4-10 μm; oil field simulation water, total mineralization degree 4300ppm; the sand filling pipe has the size of 2.5cm multiplied by 50cm and the permeability of 3000mD.
The specific experimental steps are as follows: respectively injecting self-suspended particles and traditional flexible particles into a sand filling pipe, wherein the size of an injection slug is 1PV, then injecting simulated water into an oil field until the pressure is stable, and recording the pressure difference between two ends of a rock core.
The experimental results are shown in fig. 5, and it can be seen that the pressure rise of the self-suspended particles is higher than that of the flexible particles during the chemical injection stage, and the flow resistance is larger. In the subsequent water flooding stage, the pressure change of the self-suspended particles shows the trend of rising first, then falling and tending to be stable, and the final pressure stability value is far from the high-flexibility particles, but the particle diameters of the self-suspended particles and the high-flexibility particles are almost the same, which shows that the self-suspended particles have stronger retention capacity in the porous medium and better plugging effect.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (10)
1. The self-suspended particle profile control agent is characterized by being prepared by reacting mother liquor with sodium ions in formation simulation water, wherein the mother liquor comprises the following components in parts by weight: 0.5-4 parts of alkali, 3-15 parts of higher fatty acid and 100 parts of water; the formation simulation water comprises 3-10 parts of salt and 100 parts of water.
2. The self-suspending particulate profile control agent according to claim 1, wherein the mother liquor comprises, in parts by weight: 0.5-1.5 parts of alkali, 4-9 parts of higher fatty acid and 100 parts of water.
3. The self-suspending particulate profile control agent of claim 1 or 2, further comprising: 3-12 parts of alcohol.
4. The self-suspending particulate profile control agent of claim 3, wherein the base is potassium hydroxide; the higher fatty acids include: one or more of arachidic acid, behenic acid, stearic acid and oleic acid.
5. The self-suspending particulate profile control agent of claim 3, wherein the salt comprises: sodium chloride, sodium sulfate, sodium carbonate, sodium bicarbonate; the alcohol comprises: ethanol, ethylene glycol, propanol.
6. A method of preparing a self-suspending particulate profile control agent as claimed in any one of claims 1 to 5, comprising the steps of:
(1) Sequentially adding alkali and higher fatty acid into water according to a ratio, heating and stirring to obtain mother liquor;
(2) And slowly dropwise adding the mother solution into the stratum simulation water to obtain the self-suspended particle profile control agent.
7. The method for preparing a self-suspending particle profile control agent according to claim 6, wherein the heating temperature is 95-98 ℃, the stirring speed is 550-600r/min, and the stirring time is 3-4 hours.
8. The method of preparing a self-suspending particulate profile control agent as claimed in claim 6, wherein the concentration of the mother liquor is 1500-2000mg/L; the concentration of the formation simulation water is 4000-8000mg/L.
9. The method of claim 6, wherein the self-suspending particles in the self-suspending particle profile control agent have a particle size of 3.5-16 μm and a suspension time of 3-4 hours.
10. Use of the self-suspending particulate profile control agent of any one of claims 1 to 9 in near wellbore profile control operations.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1161365A (en) * | 1996-09-10 | 1997-10-08 | 中国科学院新疆化学研究所 | High temp. resistant high specific gravity emulsion contg. high salt water |
| CN110591679A (en) * | 2019-10-16 | 2019-12-20 | 西南石油大学 | Granular profile control agent adaptive to size of pore throat of stratum and preparation method thereof |
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2022
- 2022-10-14 CN CN202211257069.3A patent/CN115449356A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1161365A (en) * | 1996-09-10 | 1997-10-08 | 中国科学院新疆化学研究所 | High temp. resistant high specific gravity emulsion contg. high salt water |
| CN110591679A (en) * | 2019-10-16 | 2019-12-20 | 西南石油大学 | Granular profile control agent adaptive to size of pore throat of stratum and preparation method thereof |
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| 曾益坤等: "脂肪酸金属盐生产工艺介简介", 《四川粮油科技》, pages 17 - 19 * |
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