CN115991987B - Enhanced film-forming type scouring-resistant emulsion and technological method for improving acidification effect of oil field - Google Patents
Enhanced film-forming type scouring-resistant emulsion and technological method for improving acidification effect of oil field Download PDFInfo
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Abstract
The invention belongs to the technical field of petrochemical industry, and particularly relates to a reinforced film-forming type scouring-resistant emulsion and a process method for improving the acidification effect of an oil field. The emulsion comprises film-forming type scouring-resistant sand control agent emulsion, polyhydroxy polymer and water. The technological method for improving the acidification effect of the oil field starts from changing the interface property of the pore of the reservoir, and utilizes the film-forming property of the reinforced film-forming type scouring-resistant emulsion to isolate the acid liquid from the surface of the pore, thereby delaying the reaction rate of acid and rock, expanding the acidification radius, realizing the acidification transformation of the deep part of the reservoir, improving the deep acidification effect and providing a novel method for improving the acidification effect of the oil field. After the method is adopted, the pump can be directly put into production without waiting for closing the well, thereby saving the operation time.
Description
Technical Field
The invention belongs to the technical field of petrochemical industry, and particularly relates to a reinforced film-forming type scouring-resistant emulsion and a process method for improving the acidification effect of an oil field.
Background
Acidification is one of the main measures for improving and increasing the yield of oil field reservoirs, and the previous research is mainly focused on the liquid phase performance of an acid liquid system, so that some outstanding problems are exposed in long-term well site practice. The acid rock reaction speed is high in the acidification process, acid liquor is consumed in a large amount at the front section of the well, deep acidification cannot be achieved, and the cost is too high although retarded acid, polyhydrogenated acid and the like are adopted to slow down the acid rock reaction. Especially for high-temperature reservoir acidification, the existing retarded acid can not effectively slow down the reaction speed of acid rock, so that the reservoir acidification effect is not ideal and the acidification pipe column is severely corroded. It can be seen that effective control of reservoir acid rock reaction rate is critical to improving the well acidizing effect, especially the high temperature reservoir acidizing effect. At present, the approach for improving the acidification efficiency is mainly to reduce the reaction rate of acid rocks, and two main methods are available: a retarded acid system is used or a surfactant is added.
The invention patent CN108219767B discloses an offshore oilfield acidification yield increasing system which is prepared from the following raw materials in percentage by weight: 20% -50% of chelating acid and NH 4 F 3 5 percent, 2 to 3 percent of corrosion inhibitor, 1 to 3 percent of mutual solvent, 1 to 2 percent of clay stabilizer and the balance of water. The offshore oilfield acidification yield increasing system adopts chelating acid to provide H + With NH in the system 4 F forming a chelating acid system, when encountering clay minerals and mud after entering the well, continuously providing H by the chelating acid + While consuming F in the system + The chelating acid has strong chelating capacity to metals, so that the chelating of heavy metals such as iron and the like can be ensured in the measure process, the secondary sedimentation is avoided to damage a reservoir, on the other hand, the chelating acid has the characteristic of low acidity, the acidity value after the reaction is close to neutrality, the collection amount of residual liquid after the reaction can be greatly reduced, the operation cost is greatly reduced, and the benefit is effectively improved.
Chinese patent No. CN108203580a discloses a method for reducing pressure and increasing injection by using gemini surfactant: sequentially injecting hydrochloric acid containing an additive, earth acid containing the additive and gemini surfactant solution into the middle part of the oil layer; after the gemini surfactant is injected, water is injectedDisplacing the agent into the formation; water injection can be started after completion; the dosage of the earth acid per meter of oil layer is 0.5m 3 ～2m 3 The method comprises the steps of carrying out a first treatment on the surface of the The hydrochloric acid consumption of each meter of oil layer is 0.8-1.2 times of the soil acid consumption, and the gemini surfactant consumption of each meter of oil layer is 4m 3 ～8m 3 The method comprises the steps of carrying out a first treatment on the surface of the The gemini surfactant solution is ethyl didodecyl ammonium phosphate solution, and the concentration is 5.0% -7.5%. According to the method, the gemini surfactant is utilized to achieve the purpose of reducing pressure and increasing injection of the water injection well of the low-permeability oil reservoir, and the effective period is longer than that of a conventional acidizing measure.
The Chinese patent No. 108559481A discloses a plugging removing liquid for a low-fluid loss acidizing oilfield well, which comprises the following raw materials in parts by weight: 20-40 parts of organic acid, 110-130 parts of composite acid main body, 2-4 parts of corrosion inhibitor, 30-40 parts of micelle acid stabilizer solution, 1-2 parts of surfactant and 1-3 parts of sodium tripolyphosphate.
Most of the retarder acid synthesized and researched in China at present reduces the diffusion speed of hydrogen ions, such as thickening acid, cross-linking acid, emulsifying acid and the like, by increasing the viscosity of the acid, but has the defects of overlarge viscosity, difficult pumping and difficult flowback; there are also acidifying materials and processes that release hydrogen ions by multi-hydrogen acid fractionation, but are expensive. The surfactant is added, hydrogen ions are isolated by hydrophobic chains through the adsorption of the surfactant on the surface of the rock, so that the aim of retarding is fulfilled, but the surfactant is small molecules, so that the acid liquor is poor in filtration reducing effect, and the formed isolating film is thin and not compact, and is poor in scouring resistance, so that the acidification effect is influenced.
Disclosure of Invention
The invention mainly aims to provide a process method for strengthening film-forming type anti-scouring emulsion and improving the acidification effect of an oil field. The formed film type scouring-resistant emulsion can generate an acid-resistant film, so that the rapid reaction consumption of acid liquor and the rock surface is avoided; the technological method for improving the acidification effect of the oil field starts from changing the interface property of the pore of the reservoir, and utilizes the film-forming property of the reinforced film-forming type scouring-resistant emulsion to isolate the acid liquid from the surface of the pore, thereby delaying the reaction rate of acid and rock, expanding the acidification radius, realizing the acidification transformation of the deep part of the reservoir, improving the deep acidification effect and providing a novel method for improving the acidification effect of the oil field.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a reinforced film-forming type scouring-resistant emulsion, which comprises film-forming type scouring-resistant sand control agent emulsion, polyhydroxy polymer and water. The film-forming type scouring-resistant sand control agent emulsion is prepared by a method described in a prior invention patent CN108728071B of the applicant. The polyhydroxy polymers include, but are not limited to, vegetable guanidine gum, glucose, polysaccharides and modified products thereof, polyvinyl alcohol, polyether, and the like.
Further, in the reinforced film-forming type scouring-resistant emulsion, the film-forming type scouring-resistant sand control agent emulsion accounts for 3-20% by volume; the volume percentage of the polyhydroxy polymer is 0.5-5%, and the balance is water. If the sum of the volume percentages of the film-forming anti-scouring sand control agent emulsion and the polyhydroxy polymer is more than 25%, the film formed after injection is too thick, and the permeability of an oil well is affected; if the sum of the volume percentages of the two is less than 3.5%, the reinforced film forming is incomplete, and the isolation effect is affected.
The invention also provides a process method for improving the acidification effect of the oil field, which comprises the following steps: and (3) injecting the reinforced film-forming type anti-scouring emulsion during the acidification construction of the oil field.
Further, the reinforced film-forming type anti-scouring emulsion and oilfield sewage are alternately injected in equal volumes by adopting a multi-section plug alternate injection mode.
Further, the injection displacement of the enhanced film-forming type anti-scouring emulsion is controlled to be 100-5000L/min. The specific displacement is determined based on the imbibition capacity of the formation after the formation is extruded.
Further, the injection quantity Q of the enhanced film-forming type scouring-resistant emulsion is calculated according to the following formula:
wherein r is i -a design radius, m; r is (r) w -wellbore radius, m;-average porosity of the oil layer; h-oil layer thickness, m.
Before injecting the reinforced film-forming type anti-scouring emulsion, the method further comprises injecting a pre-liquid; the pre-liquid is prepared from water, micro emulsion and hydrochloric acid. The injected pre-liquid can dissolve and drive away divalent metal ions such as calcium, magnesium and the like which can generate sediment with fluosilicic acid ions, so that the fluosilicic acid sediment produced by the hydrofluoric acid in the subsequent acidification working solution is prevented from blocking the reservoir.
Further, the volume percentage of the micro emulsion in the pre-solution is 1.5-1.9%, and the volume percentage of the hydrochloric acid is 13.3-22.5%. The preparation method of the micro emulsion is prepared by referring to patent CN 200610009675.8.
After the injection of the enhanced film-forming type scouring-resistant emulsion is finished, the method further comprises the steps of injecting an acidizing working solution, and then directly injecting water or sand-carrying fluid.
Further, the volume of the injected water or sand-carrying fluid is 1.5 times or more of the volume of the injected acidified working fluid. The liquid amount can enable the acid liquor to be pushed into the deep part of the reservoir, so that the acid liquor is effectively utilized.
Compared with the prior art, the invention has the following advantages:
the enhanced film-forming type erosion-resistant emulsion is characterized in that polyhydroxy polymers are added into film-forming type erosion-resistant sand control agent emulsion, so that the self-assembly of the hydrogen bonding action of a macromolecular group structure is facilitated, and an enhanced hydrophilic film layer is formed; on the basis of forming a double-base membrane by forming a bottom polyamide hydrophilic layer by film-forming type scouring-resistant sand control agent emulsion and forming a hydrophobic layer by entanglement of long carbon chains on the surface, a polyhydroxy polymer demulsification agent and the bottom polyamide hydrophilic layer are introduced to form a double-hydrophilic layer (network interpenetrating layer) through hydrogen bonding, so that film forming strength is improved, and meanwhile, the existence of the double-hydrophilic layer (network interpenetrating layer) can be multiplied by a functional group forming hydrogen bonding with active hydroxyl on the surface of a pore, so that the adsorptivity of the reinforced membrane is improved.
The reinforced film-forming type scour-resistant emulsion water chain segment contains carboxyl, divalent metal ions such as calcium ions, magnesium ions and the like in stratum water can form a weak crosslinking structure to further increase the strength of a hydrophobic film layer, the reinforced film-forming type scour-resistant emulsion is demulsified and separated out on the wet surface of pore water to generate an acid-resistant film which is adhered to the surface of the pore, and acid liquor and the surface of the pore are isolated, so that the reaction rate of acid rock is delayed, and deep acidification of a reservoir is realized; and meanwhile, the formation particles are covered by the generated film, so that the influence of secondary acidification pollution on the construction effect is prevented. The corrosion of the existing acidification method to the near-well skeleton is avoided.
The technological method for improving the acidification effect of the oil field starts from changing the interface property of the pore of the reservoir, and utilizes the film-forming property of the reinforced film-forming type scouring-resistant emulsion to isolate the acid liquid from the surface of the pore, thereby delaying the reaction rate of acid and rock, expanding the acidification radius, realizing the acidification transformation of the deep part of the reservoir, improving the deep acidification effect and providing a novel method for improving the acidification effect of the oil field. After the method is adopted, the pump can be directly put into production without waiting for closing the well, thereby saving the operation time.
Drawings
FIG. 1 is a schematic diagram of the molecular structure of the film-forming anti-scouring sand control agent emulsion of example 1 of the present invention after reaction with a polyhydroxy polymer;
FIG. 2 is a diagram of a film-forming object of the enhanced anti-scouring emulsion of example 1 of the present invention on a water surface;
FIG. 3 is a graph of the enhanced film forming and erosion resistance of the enhanced film forming type anti-scouring emulsion of example 1 of the present invention on the surface of glass and after the acid solution is added dropwise.
FIG. 4 is a microstructure diagram of the film-forming microstructure reinforced by the erosion-resistant emulsion of the invention with different film-forming concentrations; A. the B diagram is a reinforced film-forming type scour-resistant emulsion reinforced film-forming scanning electron microscope diagram of the embodiment 4, and the thickness of the microstructure is about 8 um; FIG. C is an atomic force microscope image of the emulsion film formed in comparative example 1, with a microscopic film structure thickness of about 0.3 um; and D, a reinforced film forming type anti-scouring emulsion reinforced film forming atomic force microscope image of the embodiment 4, wherein the film thickness is 2.3um.
FIG. 5 is a schematic diagram of a conventional acidizing corrosion near-well framework.
FIG. 6 is a graph showing the doubling of liquid amount after film formation acidification by L58-X55 well reinforcement;
FIG. 7 is a graph showing the doubling of the liquid amount after acidification of the film formation by the TA1-X24 well reinforcement.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, and/or combinations thereof.
In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail with reference to specific embodiments.
Example 1
A reinforced film-forming type anti-scouring emulsion comprises film-forming type anti-scouring sand control agent emulsion, guar gum and water.
The emulsion of the film-forming type scouring-resistant sand control agent has the volume percentage of 20%, the guar gum has the volume percentage of 5% and the balance of water.
The preparation method of the film-forming type scouring-resistant sand control agent emulsion is as described in an embodiment 1 of an invention patent CN 108728071B.
The reinforced film-forming type anti-scouring emulsion described in example 1 was subjected to a rotating disc experiment after the rock was reinforced film-formed, in which the rock was placed in a high-pressure high-temperature reactor, the rock was rotated while the acid solution was stationary, and the results are shown in Table 1, in which the corrosion rate after film coating was the smallest compared with the corrosion rates of various acids, and in which the corrosion rate after film coating was 3.7X10 compared with 1.40mol/L (5 wt%) of hydrochloric acid at 60 ℃ C.) -5 gmol/(cm 2 S) erosion Rate, the erosion Rate after coating is greatly reducedAt 90%.
TABLE 1 comparative data table of erosion Rate of partial acids
Example 2
A reinforced film-forming type scouring-resistant emulsion comprises film-forming type scouring-resistant sand control agent emulsion, polyvinyl alcohol and water.
The emulsion of the film-forming scouring-resistant sand control agent has the volume percentage of 3 percent, the volume percentage of polyvinyl alcohol is 0.5 percent, and the balance is water.
The preparation method of the film-forming type scouring-resistant sand control agent emulsion is as described in the embodiment 2 of the invention patent CN 108728071B.
Example 3
A reinforced film-forming type anti-scouring emulsion comprises film-forming type anti-scouring sand control agent emulsion, polyether and water.
The emulsion of the film-forming type scouring-resistant sand control agent has the volume percentage of 15%, the volume percentage of polyether is 3%, and the balance is water.
The preparation method of the film-forming type scouring-resistant sand control agent emulsion is as described in an embodiment 1 of an invention patent CN 108728071B.
Example 4
A reinforced film-forming type anti-scouring emulsion comprises film-forming type anti-scouring sand control agent emulsion, guar gum and water.
The emulsion of the film-forming type scouring-resistant sand control agent has the volume percentage of 4 percent, the guar gum has the volume percentage of 2 percent and the balance is water.
The preparation method of the film-forming type scouring-resistant sand control agent emulsion is as described in an embodiment 1 of an invention patent CN 108728071B.
Example 5
A process method for improving the acidification effect of an oil field comprises the following steps:
the reinforced film-forming type anti-scouring emulsion described in the embodiment 1 is injected into a construction well to be acidified at one time, the injection displacement is controlled at 1000L/min, and the injection quantity is calculated according to the formula (1) according to Q.
Example 6
A process method for improving the acidification effect of an oil field comprises the following steps:
and (3) alternately injecting the reinforced film-forming type anti-scouring emulsion and the equal volume of oilfield sewage in the to-be-acidized construction well in 3 slugs, wherein the injection displacement of the reinforced film-forming type anti-scouring emulsion is controlled to be 1000L/min, and the injection quantity of the reinforced film-forming type anti-scouring emulsion is calculated according to a formula (1) according to Q.
Example 7
A process method for improving the acidification effect of an oil field comprises the following steps:
1) And injecting a pre-fluid into the construction well to be acidified, wherein the pre-fluid is prepared from water, micro emulsion and hydrochloric acid. The volume percentage of the micro emulsion is 1.7%, the volume percentage of hydrochloric acid (hydrochloric acid is industrial product, the concentration is 31 wt%) is 18%, and the rest is water.
The preparation method of the micro emulsion refers to patent CN200610009675.8: the preparation method comprises the steps of preparing raw materials according to the mass ratio of 1.0 part of LAS, 4.5 parts of AES, 10 parts of sec-butyl alcohol, 10 parts of benzene and 60 parts of water mixed in a ratio of 1:1, dissolving sec-butyl alcohol in water to prepare an alcohol aqueous solution, adding LAS and AES into the alcohol aqueous solution to dissolve the LAS and the AES, and then dropwise adding mixed benzene to obtain a micro-emulsion product.
The injection displacement is controlled at 1000L/min, and the injection quantity is calculated according to the formula (1) according to Q.
2) And (3) alternately injecting the reinforced film-forming anti-scouring emulsion in the embodiment 1 and the equal volume of oilfield sewage into the construction well to be acidified, wherein the injection displacement of the reinforced film-forming anti-scouring emulsion is controlled at 3000L/min, and the injection quantity of the reinforced film-forming anti-scouring emulsion is calculated according to the formula (1) according to Q.
3) Injecting an earth acid acidification working solution, and controlling the injection displacement to be 1000L/min;
4) Directly injecting the oilfield sewage with the volume 1.5 times of that of the acidizing working fluid;
5) And performing construction operation.
Example 8
A process method for improving the acidification effect of an oil field comprises the following steps:
1) And injecting a pre-fluid into the construction well to be acidified, wherein the pre-fluid is prepared from water, micro emulsion and hydrochloric acid. The volume percentage of the micro emulsion is 1.9%, the volume percentage of hydrochloric acid (hydrochloric acid is industrial product, the concentration is 31 wt%) is 22.5%, and the rest is water.
The preparation method of the micro emulsion refers to patent CN200610009675.8: raw materials are prepared according to the mass ratio of LAS2 parts, AES3 parts, sec-butyl alcohol 15 parts, mixed benzene 20 parts of toluene and xylene 1:1 and water 60 parts, sec-butyl alcohol is firstly dissolved in water to prepare an alcohol aqueous solution, LAS and AES are added into the alcohol aqueous solution to be dissolved, and then mixed benzene is added dropwise to obtain a micro-emulsion product.
The injection displacement is controlled at 500L/min, and the injection quantity is calculated according to the formula (1) according to Q.
2) And (3) alternately injecting the reinforced film-forming anti-scouring emulsion in the embodiment 1 and the equal volume of oilfield sewage into the construction well to be acidified, wherein the injection displacement of the reinforced film-forming anti-scouring emulsion is controlled at 300L/min, and the injection quantity of the reinforced film-forming anti-scouring emulsion is calculated according to the formula (1) according to Q.
3) Injecting an earth acid acidification working solution, and controlling the injection discharge capacity at 500L/min;
4) Directly injecting sand-carrying fluid with the volume 3 times of that of the acidizing working fluid;
5) And performing construction operation.
Application example:
the methods described in example 7 were used for the L58-X55 wells and the TA1-X24 wells, respectively, and the production conditions obtained were as shown in FIG. 6 and FIG. 7, respectively. The liquid quantity of each well after the film formation and acidification is enhanced is improved by more than 20 percent.
Comparative example 1
An emulsion comprises film-forming type scouring-resistant sand control agent emulsion, guar gum and water.
The emulsion of the film-forming type scouring-resistant sand control agent has the volume percentage of 2%, the guar gum has the volume percentage of 1% and the balance is water.
The preparation method of the film-forming type scouring-resistant sand control agent emulsion is as described in an embodiment 1 of an invention patent CN 108728071B.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (1)
1. The method for improving the acidification effect of the oil field is characterized by being realized by adopting reinforced film-forming type anti-scouring emulsion, wherein the reinforced film-forming type anti-scouring emulsion is prepared from 3-25% of film-forming type anti-scouring sand control agent emulsion in volume percentage, 0.5-5% of polyhydroxy polymer in volume percentage and the balance of water;
the preparation of the film-forming type scouring-resistant sand control agent emulsion comprises the following steps: placing 20g of alcohol-soluble polyamide resin particles HY-508 in 80g of ethanol solvent, and uniformly stirring to prepare an organic solution of polyamide; placing 1.5g of hectorite powder into 98.5g of water, uniformly stirring, and standing for three days for standby to prepare a hectorite water dispersion system; 0.5g OP-10 is placed in a hectorite aqueous dispersion; mixing 30g of organic solution and 70g of surfactant solution uniformly under the condition of stirring speed of 3000 r/min and stirring time of 10 minutes;
the polyhydroxy polymer is selected from vegetable guanidine gum, glucose, polyvinyl alcohol and polyether;
the acidification effect method comprises the following steps:
when the oilfield acidizing construction is carried out, a multi-section plug alternate injection mode is adopted, and the reinforced film-forming type scouring-resistant emulsion and oilfield sewage are injected in equal volume; the injection displacement of the enhanced film-forming type anti-scouring emulsion is controlled to be 500-1000L/min;
the injection quantity Q of the enhanced film-forming type scouring-resistant emulsion is calculated according to the following formula:
wherein r is i -a design radius, m; r is (r) w -wellbore radius, m;-average porosity of the oil layer; h-oil layer thickness, m;
before injecting the enhanced film-forming type scouring-resistant emulsion, injecting a pre-liquid; the pre-liquid is prepared from water, micro emulsion and hydrochloric acid; the volume percentage of the micro emulsion is 1.5-1.9%, and the volume percentage of the hydrochloric acid is 13.3-22.5%;
after the injection of the enhanced film-forming type scouring-resistant emulsion is finished, the method further comprises the steps of injecting an acidic working solution, and then directly injecting water or sand-carrying fluid; the volume of the injected water or sand-carrying fluid is 1.5 times or more of the volume of the injected acidified working fluid.
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