CN111500272A - Oil layer sand prevention liquid and preparation method and application thereof - Google Patents
Oil layer sand prevention liquid and preparation method and application thereof Download PDFInfo
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- CN111500272A CN111500272A CN202010177257.XA CN202010177257A CN111500272A CN 111500272 A CN111500272 A CN 111500272A CN 202010177257 A CN202010177257 A CN 202010177257A CN 111500272 A CN111500272 A CN 111500272A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 15
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- 238000004519 manufacturing process Methods 0.000 claims abstract description 57
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Images
Classifications
-
- 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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
- C09K8/57—Compositions based on water or polar solvents
- C09K8/572—Compositions based on water or polar solvents containing inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
- C09K8/57—Compositions based on water or polar solvents
- C09K8/575—Compositions based on water or polar solvents containing organic compounds
- C09K8/5751—Macromolecular compounds
- C09K8/5758—Macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
Abstract
The application discloses an oil layer sand control fluid and a preparation method and application thereof, and belongs to the technical field of oil field development. The oil layer sand prevention liquid is prepared from degradable particles and portland cement, wherein the degradable particles are at least one of starch particles, plant protein particles, cellulose particles and lignin particles. The oil layer sand prevention liquid provided by the embodiment of the invention realizes the reconstruction of an oil layer by injecting the silicate cement containing the degradable particles into the oil layer, and the reconstructed oil layer not only keeps the connectivity and permeability of the oil layer, but also establishes a new firm oil layer framework, thereby avoiding sand production of the oil layer, ensuring the production time rate of an oil production well and realizing the stable production of the oil production well.
Description
Technical Field
The application relates to the technical field of oilfield development, in particular to an oil layer sand control fluid and a preparation method and application thereof.
Background
The loose sandstone oil and gas reservoir in China has wide distribution range, large reserves and high yield, and plays an important role in oil field development. Under general exploitation conditions, the problems of sand blocking, sand burying, sand blocking and the like are often caused by sand production of an oil and gas well, so that the oil well lies down, and the normal production of the oil well is further influenced.
In the related technology, the sand control treatment is mainly carried out on an oil layer by adopting mechanical sand control (slotted pipe sand control) and chemical sand control (artificial cemented formation sand control). The slotted pipe is installed at the bottom of an oil pipe of an oil production well, and oil layer sand entering an oil well casing from an oil layer is blocked outside the oil pipe, so that the sand in the oil layer is prevented from entering an oil well pump cylinder to cause sand blocking or sand blocking. The artificial cemented formation sand control is to inject resin or other chemical sand-fixing agent into the oil layer to directly consolidate the sand in the oil layer.
In carrying out the present application, the applicant has found that at least the following problems exist in the related art:
the adoption of the slotted pipe for sand control can reduce the oil inlet surface and the pump efficiency, and the sand control effect is not ideal for fine sand with the particle size smaller than the slot of the slotted pipe. The sand prevention cost of the artificial cemented formation is high, and the sand body is consolidated while the pores of the oil layer are blocked, so that the permeability of the consolidated oil layer is obviously reduced.
Disclosure of Invention
In view of the above, the application provides an oil layer sand control fluid, and a preparation method and application thereof.
Specifically, the method comprises the following technical scheme:
in a first aspect, an oil layer sand prevention fluid is provided, which is prepared from degradable particles and portland cement;
the degradable particles are at least one of starch particles, plant protein particles, cellulose particles and lignin particles.
In an alternative embodiment, the mass ratio of the degradable particles to the portland cement is (5-35): 100.
in an alternative embodiment, the water content of the oil layer sand prevention liquid is 55-85%.
In an alternative embodiment, the degradable particulates are at least one of wheat flour particulates, corn flour particulates, soybean flour particulates, millet flour particulates and millet flour particulates.
In an alternative embodiment, the degradable particles have an average particle size that is less than the average particle size of the pay sand or quicksand in the pay zone.
In a second aspect, a preparation method of the sand control fluid for the oil layer is provided, and the preparation method comprises the following steps:
mixing and uniformly stirring degradable particles and portland cement dry powder to obtain oil layer sand prevention liquid dry material;
and adding water into the oil layer sand prevention liquid dry material, and uniformly stirring to prepare the oil layer sand prevention liquid.
Wherein the degradable particles are at least one of starch particles, plant protein particles, cellulose particles and lignin particles.
In an alternative embodiment, the mass ratio of the degradable particles to the portland cement is (5-35): 100.
in an alternative embodiment, the water content of the oil layer sand prevention liquid is 55-85%.
In a third aspect, there is provided use of a zonal sand control fluid according to any of the first aspects, the use comprising:
and injecting the oil layer sand prevention liquid into a sand production oil layer of the oil production well.
In an alternative embodiment, the injection amount of the oil layer sand control fluid is obtained by the following formula:
V＝π(r+A)2·d·Φ·k
wherein V is the injection amount of the oil layer sand control liquid; r is the radius of the oil production well; a is the depth of injection into the oil layer; d is the thickness of the oil layer; phi is the porosity of the oil layer; k is a constant between [ 30% -50% ].
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
the oil layer sand prevention liquid provided by the embodiment of the invention realizes the reconstruction of an oil layer by injecting the silicate cement containing the degradable particles into the oil layer, and the reconstructed oil layer not only keeps the connectivity and permeability of the oil layer, but also establishes a new firm oil layer framework, thereby avoiding sand production of the oil layer, ensuring the production time rate of an oil production well and realizing the stable production of the oil production well.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a cross-sectional view of a reservoir of a sand producing well prior to injection of a sand control fluid in accordance with an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a reservoir of a sand producing well during injection of a sand control fluid according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of an oil layer of a sand producing well after reaction of the sand control fluid provided by the embodiment of the invention.
The reference numerals in the figures are denoted respectively by:
1-producing oil well;
2-an oil well casing string;
3, producing a sand oil layer;
4-oil layer sand control fluid;
5-degradable particles;
6-portland cement;
7-oil layer skeleton sand;
8-loosening sand or shifting sand in the oil layer;
9-cannula bridging plug;
10-injecting a sand control liquid pipe column;
11-releasing.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art. Before further detailed description of the embodiments of the application, some terms used in understanding the examples of the application are explained.
Fig. 1 is a cross-sectional view of an oil layer of a sand producing oil well before injecting a sand control fluid, wherein the oil producing well 1 is a sand producing oil well, and a sand producing oil layer 3 of the sand producing oil well 1 is provided with loose sand or quicksand 8 in the oil layer in addition to skeleton sand 7 in the oil layer. When an oil pipe column is put into the oil well casing pipe column 2 for oil extraction, oil gas liquid in the sand production oil layer 3 enters the oil pipe column from an oil inlet hole at the lower end of the oil well casing pipe column 2 under the action of the oil pumping unit, at the moment, oil layer skeleton sand 7 is not moved, loose sand or flowing sand 8 in the oil layer can enter the oil pipe column along with the flowing of the oil gas liquid, and then the problems of sand blocking, sand burying, sand blocking and the like can be caused.
Based on the above, in a first aspect, the embodiments of the present invention provide an oil reservoir sand control fluid, which is prepared from degradable particles and portland cement; the degradable particles are at least one of starch particles, plant protein particles, cellulose particles and lignin particles.
In use, the zonal sand control fluid is injected into the producing zone 3 (as shown in figure 2). Fig. 2 is a cross-sectional view of an oil reservoir of a sand producing well during injection of a sand control fluid according to an embodiment of the present invention.
The specific implementation mode is as follows: firstly, a release 11 is put into the lower part of a sand production layer 3 of an oil well casing pipe column 2 of an oil production well 1, then a sand control liquid injection pipe column 10 with an insertion pipe bridge plug 9 is put into the lower part, the upper part from the insertion pipe bridge plug 9 to the sand production layer 3 is sealed after a designated position, then a high-pressure pump is used for injecting sand control liquid 4 into the oil production well 1 through the sand control liquid injection pipe column 10, and the sand production layer 3 enters from an oil inlet hole at the lower end of the sand control liquid injection pipe column 10, and the evenly mixed sand control liquid 4 of the oil layer is filled between skeleton sand 7 of the oil layer and loose sand or quicksand 8 of the oil layer, so that degradable particles 5 and silicate cement 6 are evenly distributed in holes of the sand.
After a period of time, the portland cement 6 sets in the sanded reservoir 3, causing loose sand or quicksand 8 and degradable particulates 5 to also consolidate therein.
After another period of time, the consolidated degradable particles 5 are degraded and disappear in the sand production reservoir 3 (as shown in fig. 3), fig. 3 is a profile view of the reservoir of the sand production well after the reaction of the sand control fluid provided by the embodiment of the invention, the degradable particles 5 are degraded to make up the occupied space volume, and the loose sand or the quicksand 8 of the reservoir is still fixed in the original position by the portland cement 6 and is difficult to flow, so that the effects of sand control and sand consolidation are achieved. The Portland cement 6 forms a criss-cross net structure in the oil layer, so that oil flow pores of the oil layer are reserved, and a new firm oil layer framework is formed.
The oil layer sand prevention liquid provided by the embodiment of the invention realizes the reconstruction of an oil layer by injecting the silicate cement containing the degradable particles into the oil layer, and the reconstructed oil layer not only keeps the connectivity and permeability of the oil layer, but also establishes a new firm oil layer framework, thereby avoiding sand production of the oil layer, ensuring the production time rate of an oil production well and realizing the stable production of the oil production well.
In the oil layer sand control fluid, the silicate cement can be silicate cement clinker mainly comprising calcium silicate, less than 5 percent of limestone or granulated blast furnace slag and a hydraulic cementing material prepared by grinding a proper amount of gypsum.
The main mineral components of the portland cement are tricalcium silicate, dicalcium silicate, tricalcium aluminate, tetracalcium aluminoferrite, calcium oxide and the like. Wherein tricalcium silicate determines the strength of portland cement within four weeks; the strength of the dicalcium silicate is exerted after four weeks, and the strength of the dicalcium silicate reaches four weeks about one year; tricalcium aluminate develops strength faster but has lower strength, and plays a certain role in the strength of portland cement within 1 to 3 days or a little longer time; tetracalcium aluminoferrite also develops strength faster, but has low strength and contributes little to the strength of portland cement. Wherein, the addition of sodium silicate (commonly known as sodium silicate or water glass) can accelerate the setting and hardening of the portland cement.
The Portland cement has the advantages of fast setting and hardening, good freezing resistance, small drying shrinkage, good wear resistance and the like. In the practical application of the invention, the portland cement can be any one or more of pure clinker portland cement, ordinary portland cement, slag portland cement, pozzolanic portland cement, fly ash portland cement, portland cement with portland cement and the like.
More specifically, portland cement can be selected from the six grades of class a, B, C, D, G, H of the national standard GB/T10238-2015 oil well cement according to well temperature, pressure and formation fluid properties.
In order to improve the strength of the sandstone framework of the oil layer and avoid the problem of poor stability after the oil layer is transformed, the portland cement with high silicon salt content and low calcium salt content can be customized according to actual requirements.
The degradable particles in the present invention refer to organic particles capable of being naturally degraded in an aqueous solution, and may be any one of starch particles, plant protein particles, cellulose particles and lignin particles, or a combination of two or more thereof.
Starch is a polysaccharide, which can be regarded as a high polymer of glucose, and has a simple structure of (C)6H10O5)n. The starch can be extracted from starch-containing materials such as semen Tritici Aestivi, semen Maydis, semen Setariae, semen Panici Miliacei, etc. Starch granules refer to granules containing starch. In the practice of the present invention, the starch granules can be obtained directly by grinding wheat, corn, millet. Starch granules are naturally degradable in water, and the degradation reaction comprises the following steps:
starch (granules) + water → glucose;
glucose → ethanol → acetaldehyde → acetic acid (dissolved in water).
When the degradable particles are starch particles, the degradable particles are hydrolyzed and then dissolved in water, so that the occupied space volume is made.
Furthermore, acetic acid generated after starch hydrolysis saccharification can also react with calcium oxide in the cement to generate water-soluble calcium acetate to remove the skeleton of the cement in the oil layer sandstone, so that the porosity of the cement injected into the oil layer sandstone can be further improved. The reaction comprises the following steps:
acetic acid + calcium oxide → calcium acetate + water.
Further, since the oil reservoir is composed of sandstone and limestone, the chemical formula of limestone is CaCO3The acetic acid generated after starch hydrolysis and saccharification can also react with limestone (calcium carbonate) in the oil layer to generate calcium acetate which is blended into oil layer liquid, so that the sandstone framework of the oil layer is remolded, and the porosity is further increased. The reaction comprises the following steps:
acetic acid + calcium carbonate → calcium acetate + carbon dioxide + water.
It can be seen that when the degradable granules are starch granules, on one hand, they are hydrolyzed to generate glucose which is dissolved in water, leaving a space occupied by the glucose; on the other hand, the acetic acid generated after hydrolysis saccharification reacts with calcium oxide in the cement and calcium carbonate in the oil layer to generate water-soluble calcium acetate, so that the oil layer sandstone framework can be remolded, and the porosity of the cement injected into the oil layer and the oil layer is further improved.
The plant protein is one of proteins, including complete protein and incomplete protein, and can be extracted from plant protein-containing materials such as beans, sorghum, and oat. By vegetable protein particles is meant particles containing vegetable protein. In the practice of the present invention, the vegetable protein particles may be obtained directly by grinding soybeans, sorghum, oats. In the alkaline environment of oil layer, alkali is used as catalyst, the vegetable protein particle is degraded continuously, and its reaction includes:
vegetable protein (particles) → amino acid + polypeptide + carbon dioxide, etc.,
the products are all water-soluble substances, and after a certain period of time, the vegetable protein particles are degraded and disappear in oil layer cement, so that the permeability and the pore structure of an oil layer are remodeled.
Cellulose is a macromolecular polysaccharide composed of glucose, and can be extracted from plant straw, plant leaves, and plant rhizome. Cellulose particles refer to cellulose-containing particles. In the practice of the present invention, the cellulose particles may be obtained directly by grinding plant stalks, leaves or rhizomes. The degradation reaction of the cellulose particles in the reservoir cement is as follows: cellulose hydrolysis reaction formula
(C6H10O5) n (cellulose) + nH2O→nC6H12O6(glucose)
The product is water soluble matter, and after certain period, the cellulose particle will be hydrolyzed inside the oil layer cement to make up space.
Lignin is an aromatic high polymer containing structural units of oxyphenbutamol or derivatives thereof, which is widely present in the amorphous molecular structure of plants. The wood is contained in a large amount in hard tissues, and is generally present in stems of plants and shells of seeds. Lignin particles are particulate matter comprising lignin. In the practice of the invention, the lignin particles can be obtained directly by grinding branches, wheat bran or walnut shell powder. Because the molecular structure of lignin has active groups such as aromatic group, phenolic hydroxyl group, alcoholic hydroxyl group, carbon-based conjugated double bond and the like, different chemical reactions can be carried out in different environments, such as: oxidation, reduction, hydrolysis, acidolysis, halogenation, polycondensation, grafting or copolymerization, among many other chemical reactions. Some water-soluble substances after reaction can be continuously separated out in oil layer cement, so that the porosity and the permeability of an oil layer are improved.
The present invention injects silicate cement solution containing degradable grains in certain concentration into the sand producing oil layer of sand producing oil well, and after the chemical reaction and change inside the sand producing oil layer, the well is completed with pump. Wherein, the size of the new oil layer sandstone framework and the porosity after the modification can be determined by the size and the content of the added degradable particles.
Considering the stability of a new reservoir sandstone framework formed by the portland cement after the degradable particles are degraded, the mass ratio of the degradable particles to the portland cement can be (5-35): 100. illustratively, the mass ratio of degradable particles to portland cement may be: 5: 100. 6: 100. 7: 100. 8: 100. 9: 100 … … 31:100, 32:100, 33:100, 34:100, 35:100, etc.
Similarly, the average particle size of the degradable particles should be smaller than the average particle size of the loose sand or the quicksand of the oil reservoir in consideration of the enforceability of sand control of the oil reservoir and the stability of the new sandstone skeleton of the oil reservoir formed by the portland cement after degradation of the degradable particles. The average particle size range of the loose sand or the quicksand in the oil layer is 20-200 mu m, and the average particle size of the degradable particles can be selected according to the average particle size of the loose sand or the quicksand in the oil layer in specific application.
It is understood that the average particle size is a measure of the geometric size of the population of dispersed solid particles. In a case where an actual particle group consisting of particles having different sizes and shapes is compared with a hypothetical particle group consisting of uniform spherical particles, if the overall lengths of the particles are the same, the diameter of the spherical particles is referred to as the average particle diameter of the actual particles.
In addition, the water content of the oil layer sand control fluid may be set to 55 to 85% in consideration of the fluidity and the consolidation of the oil layer sand control fluid. For example, the water content of the oil layer sand control fluid may be: 55%, 56%, 57%, 58%, 59% … … 81%, 82%, 83%, 84%, 85%, etc.
In a second aspect, an embodiment of the present invention provides a preparation method of an oil layer sand control fluid, including the following steps:
mixing and uniformly stirring degradable particles and portland cement dry powder to obtain oil layer sand prevention liquid dry material;
adding water into the oil layer sand prevention liquid dry material, and uniformly stirring to prepare the oil layer sand prevention liquid;
wherein the degradable particles are at least one of starch particles, plant protein particles, cellulose particles and lignin particles.
The oil layer sand prevention liquid prepared by the preparation method provided by the embodiment of the invention realizes the reconstruction of an oil layer by injecting the silicate cement containing degradable particles into the oil layer, and the reconstructed oil layer not only keeps the connectivity and permeability of the oil layer, but also establishes a new and firm oil layer framework, thereby avoiding the sand production of the oil layer, ensuring the production time rate of a production well and realizing the stable production of the production well.
In addition, the preparation method is simple and easy to implement, raw materials are easy to obtain, the cost is low, and the production cost can be greatly saved.
Wherein, the water used in the preparation method can be water compatible with a sand prevention oil layer.
In the above preparation method, the selection of the portland cement and the degradable particles has been described in detail in the first aspect, and will not be described herein again.
In the preparation method provided by the embodiment of the invention, in order to accelerate the dissolution of calcium oxide in the portland cement, a cooked starch aqueous solution can be added into the portland cement solution to promote the acidification of the degradable particles. Quickening the reaction process and realizing quick setting and early strength.
Considering the stability of a new reservoir sandstone framework formed by the portland cement after the degradable particles are degraded, the mass ratio of the degradable particles to the portland cement can be (5-35): 100. illustratively, the mass ratio of degradable particles to portland cement may be: 5: 100. 6: 100. 7: 100. 8: 100. 9: 100 … … 31:100, 32:100, 33:100, 34:100, 35:100, etc.
The water content of the oil layer sand prevention liquid can be 55-85% by considering the fluidity and the consolidation of the oil layer sand prevention liquid. For example, the water content of the oil layer sand control fluid may be: 55%, 56%, 57%, 58%, 59% … … 81%, 82%, 83%, 84%, 85%, etc.
In a third aspect, embodiments of the present invention further provide an application of any of the sand control fluids for oil reservoirs according to the first aspect, the application including: and injecting the oil layer sand prevention liquid into a sand production oil layer of the oil production well.
As shown in fig. 2-3, the above-described zonal sand control fluid is injected into the sand producing zone 3 (shown in fig. 2). Fig. 2 is a cross-sectional view of an oil reservoir of a sand producing well during injection of a sand control fluid according to an embodiment of the present invention.
The specific implementation mode is as follows: firstly, a release 11 is put into the lower part of a sand production layer 3 of an oil well casing pipe column 2 of an oil production well 1, then a sand control liquid injection pipe column 10 with an insertion pipe bridge plug 9 is put into the lower part, the upper part from the insertion pipe bridge plug 9 to the sand production layer 3 is sealed after a designated position, then a high-pressure pump is used for injecting sand control liquid 4 into the oil production well 1 through the sand control liquid injection pipe column 10, and the sand production layer 3 enters from an oil inlet hole at the lower end of the sand control liquid injection pipe column 10, and the evenly mixed sand control liquid 4 of the oil layer is filled between skeleton sand 7 of the oil layer and loose sand or quicksand 8 of the oil layer, so that degradable particles 5 and silicate cement 6 are evenly distributed in holes of the sand.
After a period of time, the portland cement 6 sets in the sanded reservoir 3, causing loose sand or quicksand 8 and degradable particulates 5 to also consolidate therein.
After another period of time, the consolidated degradable particles 5 are degraded and disappear in the sand production reservoir 3 (as shown in fig. 3), fig. 3 is a profile view of the reservoir of the sand production well after the reaction of the sand control fluid provided by the embodiment of the invention, the degradable particles 5 are degraded to make up the occupied space volume, and the loose sand or the quicksand 8 of the reservoir is still fixed in the original position by the portland cement 6 and is difficult to flow, so that the effects of sand control and sand consolidation are achieved. The Portland cement 6 forms a criss-cross net structure in the oil layer, so that oil flow pores of the oil layer are reserved, and a new firm oil layer framework is formed.
The sand-proof liquid for the oil layer is injected into the oil layer, so that the reconstruction of the oil layer can be realized, the reconstructed oil layer not only keeps the connectivity and the permeability of the oil layer, but also establishes a new and firm oil layer framework, thereby avoiding the sand production of the oil layer, ensuring the production time rate of the oil production well and realizing the stable production of the oil production well.
In the above application, the injection amount of the oil layer sand control fluid can be obtained by the following formula:
V＝π(r+A)2·d·Φ·k
wherein V is the injection amount of the oil layer sand control liquid, and the unit is cubic meter;
r is the radius of the oil production well in meters;
a is the depth of the injected oil layer, and the unit is meter;
d is the thickness of the oil layer in meters;
phi is the porosity of the oil layer;
k is a constant between [ 30% -50% ].
The radius r of the oil production well, the depth A of the injected oil layer, the thickness d of the oil layer and the porosity phi of the oil layer can be obtained by looking up the relevant data of the oil well.
The value of k is related to the effective porosity of the oil layer, and the larger the effective porosity is, the larger the value of k is.
Illustratively, when the effective porosity is relatively large, it may be desirable that k be 50%; when the effective porosity is relatively small, it is desirable that k be 30%. In other embodiments, k can be any constant between [ 30% -50% ] according to actual conditions.
In addition, the oil layer sand control liquid can be injected into a sand production oil layer of a gas well or a water injection well, the technical scheme and the technical effect are similar to those of the injection oil production well, and the details are not repeated.
The above description is only for facilitating the understanding of the technical solutions of the present application by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The oil layer sand prevention liquid is characterized by being prepared from degradable particles and portland cement;
the degradable particles are at least one of starch particles, plant protein particles, cellulose particles and lignin particles.
2. The zonal sand control fluid of claim 1, wherein the mass ratio of the degradable particles to the portland cement is (5-35): 100.
3. the reservoir sand control fluid of claim 1, wherein the reservoir sand control fluid has a water content of 55-85%.
4. The oil layer sand control fluid as claimed in claim 1, wherein the degradable particles are at least one of wheat flour particles, corn flour particles, soybean flour particles, millet flour particles, straw powder particles and plant leaf powder particles.
5. The zonal sand control fluid of claim 1, wherein the degradable particles have an average particle size that is less than an average particle size of zonal loose sand or quicksand in the zonal sand.
6. The preparation method of the oil layer sand control fluid is characterized by comprising the following steps:
mixing and uniformly stirring degradable particles and portland cement dry powder to obtain oil layer sand prevention liquid dry material;
adding water into the oil layer sand prevention liquid dry material, and uniformly stirring to prepare the oil layer sand prevention liquid;
wherein the degradable particles are at least one of starch particles, plant protein particles, cellulose particles and lignin particles.
7. The preparation method according to claim 6, wherein the mass ratio of the degradable particles to the portland cement is (5-35): 100.
8. the production method according to claim 6, wherein the water content of the oil layer sand control fluid is 55 to 85%.
9. Use of the zonal sand control fluid of any of claims 1-5, wherein the use comprises:
and injecting the oil layer sand prevention liquid into a sand production oil layer of the oil production well.
10. The use of claim 9, wherein the injection amount of the zonal sand control fluid is obtained by the following formula:
V＝π(r+A)2·d·Φ·k
wherein V is the injection amount of the oil layer sand control liquid; r is the radius of the oil production well; a is the depth of injection into the oil layer; d is the thickness of the oil layer; phi is the porosity of the oil layer; k is a constant between [ 30% -50% ].
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Application publication date: 20200807 |