CN115539008A - High-temperature carbonate rock reservoir deep acidizing method - Google Patents
High-temperature carbonate rock reservoir deep acidizing method Download PDFInfo
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- CN115539008A CN115539008A CN202211262412.3A CN202211262412A CN115539008A CN 115539008 A CN115539008 A CN 115539008A CN 202211262412 A CN202211262412 A CN 202211262412A CN 115539008 A CN115539008 A CN 115539008A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/725—Compositions containing polymers
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
Abstract
The invention relates to a high-temperature carbonate rock reservoir deep acidizing method, which comprises the following steps: (1) Injecting a pad fluid A agent into the reformed formation, wherein the pad fluid A agent is a low-concentration high-temperature-resistant thickening acid solution and can increase the acid absorption capacity of the formation; (2) Injecting a retarding acid B agent into the modified stratum, wherein the retarding acid B agent is a multiple retarding acid liquid, and the retarding acidification of the deep part of the reservoir is realized through multiple physical and chemical actions; (3) Injecting a displacing acid C agent into the reformed formation, wherein the displacing acid C agent is a thickened liquid with a certain acid concentration, and forms efficient corrosion on a near well, so that a high-flow-guide channel is formed in the near well; (4) Injecting a displacing liquid D agent into the reformed formation, wherein the displacing liquid D agent is clear water or liquid nitrogen; and (5) closing the well for 0.5-8 hours, and opening the well for flowback. The multiple-retarding acid liquid is injected into the stratum, has the characteristics of low damage, easiness in injection, multiple retarding and low cost, is matched with other acid liquids to complete the acidification operation, and has wide market application prospect.
Description
Technical Field
The invention belongs to the technical field of yield increase of oil and gas fields, and particularly relates to a deep acidification method for a high-temperature carbonate reservoir.
Background
With the rapid growth of the world's economy, the world's demand for petrochemical energy is increasing, and currently 90% of the world's transportation energy needs to be harvested from petroleum. In addition, petroleum is a raw material of many chemical products, and thus is one of the most important commodities in the world at present.
Oil resources are limited, and oil and gas exploration develops towards unconventional reservoirs such as low permeability, high temperature, ultrahigh temperature and the like in order to meet energy requirements. As exploration and development progresses to depth, more and more deep and ultra-deep carbonate reservoirs are discovered and put into development. And the acidification is a key technology for evaluating the carbonate reservoir, realizing reserve utilization and control, and realizing economic and effective development.
The mineral mainly participating in the reaction in the acidification process of the carbonate reservoir is calcite (CaCO) 3 ) And dolomitic rock (CaMg (CO) 3 ) 2 ) Therefore, the acidification reaction process is simple, and the reaction equation is as follows:
CaCO 3 +2HCl＝CaCl 2 +CO 2 +H 2 O
(CaMg(CO 3 ) 2 )+4HCl＝CaCl 2 +MgCl 2 +2CO 2 +2H 2 O
from these two equations it can be shown that carbonate rock acid reaction is easy. However, the acid rock reaction speed is too fast, so that the acid liquor is consumed in the near wellbore area, and the improvement and communication of the far wellbore area cannot be realized.
The acid liquor system development of the carbonate reservoir mainly takes the reduction of the acid rock reaction speed as a development main line. Particularly, in a high-temperature deep carbonate reservoir, the control of the acid rock reaction speed is the focus of the research on the process and the liquid. The existing acid liquid system for acidizing carbonate rock reservoirs mainly comprises three types, namely hydrochloric acid, organic acid and authigenic acid.
The hydrochloric acid includes emulsified acid, usually diesel oil-coated hydrochloric acid (reducing acid rock reaction rate by preventing contact of hydrochloric acid with rock through oil external phase), and gel acid, mainly including modified polyacrylamide and viscoelastic surfactant tackifying hydrochloric acid (reducing H by gel action) + The rate of transport to the rock surface reduces the acid rock reaction rate). Organic acids such as acetic acid, formic acid, citric acid, etc. (rely on incomplete ionization of weak acids to reduce H interaction with rocks + Concentration). The self-generated acid is mainly prepared by aldehyde and ammonium saltThe slow reaction underground produces hydrochloric acid (reduces the real-time acid concentration in contact with the rock). These acid systems have various drawbacks, such as rapid demulsification of the emulsified acid at high temperatures, cementation of agglomerates of polyacrylamide networks, failure of the viscoelastic surfactant to form micellar networks, insufficient amounts of organic acids and free acid available. Because various chemical materials are unstable or the structures of the chemical materials are damaged due to high temperature, the acidification operation of high-temperature and ultrahigh-temperature carbonate reservoirs is very difficult, the acid rock reaction is too fast, the corrosion is serious, and deep transformation cannot be realized.
In order to solve the problems of too high acid rock reaction speed, difficult deep well injection and the like in the high-temperature carbonate reservoir acidification process, the research and development of the high-temperature carbonate reservoir retarded acid liquor and the deep acidification method become urgent matters. Researchers and production increase engineers do a lot of work on the aspects of acidification technology and chemical agent materials for acidification, and the difficult problem of the acidification technology of the high-temperature carbonate reservoir cannot be fundamentally solved.
Disclosure of Invention
The invention aims to provide a high-temperature carbonate rock reservoir deep acidizing method which is reliable in principle and simple and convenient to operate, and by injecting multiple-retarding acid liquor into a stratum, an acid liquor system has the characteristics of low viscosity (low damage and easiness in injection), multiple retarding and low cost, can be matched with other acid liquor to complete acidizing operation in a synergistic mode, and has a wide market application prospect.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
According to the invention, a multiple-retarding acid solution is injected into the stratum, and through the adsorption effect of a chemical agent on the surface of a reservoir mineral, the contact between the acid solution and the mineral is prevented, so that the acid rock reaction speed is reduced, the directional arrangement effect of a low-concentration polymer network stable retarder and the dynamic movement speed of the retarder are cooperated, and finally, the deep acidification of a high-temperature carbonate reservoir is realized.
A high-temperature carbonate rock reservoir deep acidizing method sequentially comprises the following steps:
(1) And injecting a pad fluid A agent into the reformed formation, wherein the pad fluid A agent is a low-concentration high-temperature-resistant thickening acid solution, and the purpose is to test whether the formation has acid absorption capacity and increase the acid absorption capacity of the formation. A slow injection mode is adopted when the injection can be smoothly performed; if the injection is difficult, the oil pipe and the casing pipe are adopted for cyclic displacement, and then the injection is slowly performed to the stratum;
(2) Injecting a retarding acid B agent into the modified stratum, wherein the retarding acid B agent is a multiple retarding acid liquid, and the retarding acidification of the deep part of the reservoir is realized through multiple physical and chemical actions;
(3) Injecting a displacing acid C agent into the modified stratum, wherein the displacing acid C agent is a thickening liquid with a certain acid concentration, is a fast reaction type acid liquid, can form efficient corrosion on a near well, and is beneficial to forming a high-flow-guide channel on the near well;
(4) Injecting a displacement fluid D agent into the reformed formation, wherein the displacement fluid D agent is clear water or liquid nitrogen;
(5) Closing the well for 0.5-8 hours, and opening the well for flowback.
The agent A comprises the following components in percentage by weight: 1-5% of acid liquor, wherein the acid liquor is one or more of hydrochloric acid, acetic acid, formic acid and oxalic acid, 0.01-0.2% of thickening agent, 0.5-2% of corrosion inhibitor, 0.5-2% of iron ion stabilizer, 0-10% of filter-reducing agent and the balance of water.
The agent B comprises the following components in percentage by weight: 15-50% of acid liquor, wherein the acid liquor is one or more of hydrochloric acid, acetic acid, formic acid, oxalic acid, authigenic acid and chelating acid, 1-5% of retarder, 0.01-0.2% of retarder thickener, 1-5% of retarder dispersant, 1-5% of retarder synergist, 0.5-2% of corrosion inhibitor, 0.5-2% of iron ion stabilizer, 0-10% of filter-reducing agent and the balance of water.
The agent C comprises the following components in percentage by weight: 15-20% of acid liquor, wherein the acid liquor is one or more of hydrochloric acid, acetic acid and formic acid, 0.01-0.2% of thickening agent, 0.5-2% of corrosion inhibitor, 0.5-2% of iron ion stabilizer, 0-10% of filter-reducing agent and the balance of water.
The thickening agent is polyacrylamide and derivatives thereof or guar gum and derivatives thereof. The polyacrylamide and the derivatives thereof are: anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide, sulfomethylated polyacrylamide, aminomethylated polyacrylamide, partially hydrolyzed polyacrylamide, or methylene polyacrylamide. Guar gum and its derivatives are: guar hydroxypropyltrimonium chloride, hydroxypropyl guar, or carboxymethylhydroxypropyl guar.
The retarder is one or more of dodecyl dimethyl betaine, dodecyl bis-hydroxyethyl methyl ammonium chloride, dodecyl triethanolamine sulfate, dodecyl dimethyl hydroxypropyl sulfobetaine, cocamidopropyl betaine, lauramidopropyl hydroxysulfobetaine, lauramidopropyl betaine, cocoyl methyl monoethanolamide, cocoanut oil diethanolamide, cocoyl alanine triethanolamine, cocamidopropyl hydroxysulfobetaine, tributyl tetradecyl phosphorus chloride, dodecyl tributyl phosphine bromide, dodecyl trimethyl ammonium chloride and tetradecyl trimethyl ammonium chloride.
The slow-speed thickening agent is cationic polyacrylamide.
The retarding dispersant is one or more of urea, formamide, acetamide, propionamide, N-dimethylformamide, ethanol and glycol.
The retarding synergist is one or more of potassium iodide, alum, aluminum potassium sulfate dodecahydrate and antimony trioxide.
The authigenic acid is composed of ammonium chloride and formaldehyde in the same mass ratio.
The chelating acid is one or more of ethylenediamine tetraacetic acid, glutamic acid-N, N-diacetic acid, hydroxyethylidene diphosphonic acid, diethyl triaminepentaacetic acid and N-hydroxyethyl ethylenediamine triacetic acid.
The corrosion inhibitor is one or more of methyl alkynol, methyl pentynol, diethylenetriamine, butynol ethanol, hexamethylenetetramine, oleic acid and oleic acid imidazoline.
The iron ion stabilizer is one or more of disodium ethylene diamine tetraacetate, citric acid, nitrilotriacetic acid, L-glutamic acid and isoascorbic acid.
The filter-reducing agent is one or more of lignin, sodium lignosulphonate, carboxylic acid type sulfonated lignin, benzoic acid and sodium benzoate.
The mechanism of the invention is as follows: because of high deep well stress, the injection of the prior common retarded gelled acid and the cross-linked acid is very difficult, and the low-viscosity retarded acid solution is not only convenient to inject but also can realize deep acidification. The key point of the invention is multiple retarded acid liquor, and the acid liquor system synergistically reduces the acid rock reaction speed through multiple physical and chemical actions, so that the acid rock reaction speed is more efficient than that of single physical and chemical action. The general design idea of the invention is that low-viscosity and low-concentration acid liquor is firstly adopted to communicate a shaft and a stratum for preparing for subsequent acid liquor injection, then low-viscosity multiple retarded acid is injected to improve a far well area so as to effectively improve the supply capacity of the far and near areas, and finally fast reaction type acid is adopted to greatly improve the permeability of the near well area so as to effectively improve the yield of a single well.
First, high temperature deep wells are dense in reservoir rock due to the compaction of the formation, the reservoir space is usually microcracked, and the near-well plugging damage and the deposition of damage in the wellbore can be caused in the previous drilling and completion process. Therefore, low-viscosity low-concentration thickened acid liquid is injected into the stratum in the first step, the injection friction can be effectively reduced by the low viscosity, the injection difficulty of the deep well is improved, the injection difficulty is caused by the damage of the near-well stratum, the low-concentration acid can be slowly injected only by low-speed injection or circular cleaning of the well hole, the permeability of the near-well stratum is improved, and the acid absorption capacity of the near-well stratum is improved. Due to the difficulty of injection, the low-concentration acid is adopted to reduce the reaction rate of acid rocks, slowly communicate the stratum with a shaft and prepare for subsequent large-scale acid injection.
After the pad fluid communicates with the near well, the retarded acid B agent is quickly injected into the stratum. The retarded acid reduces the reaction speed of acid rock by the mutual synergy of multiple retarding effects, and can be used for acidification construction of deep ultra-deep carbonate rock reservoirs above 200 ℃ due to the fact that the system viscosity is low and the system is convenient to inject into the reservoirs. Because the deep well is compact, the yield of a single well can be effectively improved only by effectively communicating a far well. And the low viscosity can be effectively injected, and the improvement of the far well stratum permeability can be realized by multiple slowings.
And a fast reaction type acid liquid is injected into the stratum in the next step, so that a high-strength acid etching channel is formed for the near well, and a near well seepage channel is enlarged. And finally, using the displacement fluid to jack all the acid liquor in the shaft into the stratum, protecting the shaft and reducing the corrosion of the acid liquor to the pipe column.
The multiple retarded acid solution synergistically controls the mass transfer speed of reactants, prevents the reactants from contacting with each other and stabilizes the combined action of the retarded agents (reduces the dynamic motion of the retarded agents) to reduce the acid rock reaction speed through the liquid-solid reaction process. The inorganic retarding synergist is utilized to form a barrier film on the surface of the rock, and the inorganic retarding synergist and the organic retarding synergist cooperate to form a dynamic adsorption film on the surfaces of the inorganic retarding synergist and the rock. Active anions in the inorganic retarding synergist react with Ca of reservoir minerals through coulomb force 2+ 、Mg 2+ Ions are combined by covalent bonds, so that the ions can be adsorbed on the surface of the reservoir mineral to form an inorganic adsorption film; further, since the inorganic adsorption film often has gaps, the organic retarder is adopted to attract Ca of reservoir minerals through coordination bonds and static electricity 2+ 、Mg 2+ The ions are adsorbed to form a barrier film with strict hydrophobic effect (to prevent acid liquid from attacking the surface of the rock), and gaps of the inorganic adsorption film are further filled; the retarder dispersant prevents the aggregation of the organic retarder through electrostatic repulsion, the branched structure of the organic retarder further effectively prevents the organic retarder from self-aggregation into micelles, and the dual functions increase the compact and quick adsorption effect of the organic membrane retarder on the surface of the reservoir mineral; the low-concentration slow thickening agent can reduce H + The mass transfer speed of the retarder is further reduced by a spatial network of the thickening agent, so that the dynamic movement speed of the organic retarder can be stabilized, the directional arrangement of the retarder on the rock surface covers the rock surface, and the adsorption effect of the retarder is increased. The retarder thickener, the organic retarder and the acid liquor have the same electrical property (cationic property) at the same time, and the mutual repulsion of all the substances in the system realizes the dispersion and retarding effects of the system. Namely, through multiple layers of coatings and stable adsorption and H reduction + The mass transfer speed reduces the reaction speed of acid rock, and the system has low viscosity and is convenient to inject into a reservoir, so that the system can be used for acidification construction of a deep ultra-deep carbonate reservoir above 200 ℃.
Compared with the prior art, the method solves the problem that deep acidification is difficult to realize due to high reaction speed of high-temperature acid rock; the problems of high cost and poor safety of the self-generated acid are solved; the problem that high-concentration organic acid is easy to scale is solved; the problem of difficulty in injecting the high-temperature deep well thickening acid is solved, and the acidification operation of the high-temperature deep well can be safely and effectively carried out at low cost.
Detailed Description
The present invention is further illustrated below with reference to examples in order to facilitate understanding of the present invention by those skilled in the art. It is to be understood that the invention is not limited in scope to the specific embodiments disclosed, but that various changes in form and detail will be suggested to one skilled in the art and are to be included within the spirit and purview of this application and scope of the appended claims.
Example 1
The method is implemented by taking the well engineering reconstruction of the S gas field as an implementation object and utilizing a high-temperature carbonate rock reservoir deep acidification method to carry out acid fracturing measure reconstruction. The well a is a carbonate gas well, the lithology is limestone, and the reservoir temperature is 185 ℃. And determining the modification mode to be conventional acid fracturing according to the reservoir characteristics.
The method comprises the following steps: injection of pad fluid A into a formation at a pressure above the formation fracture pressure 1 Agent, A 1 The agent composition is 3% by weight of HCl +2% acetic acid +0.1% sulfomethylated polyacrylamide +2% oleic acid imidazoline +2% disodium ethylene diamine tetraacetate, and the balance of water.
Step two: injecting retarded acid B into the formation above the formation fracture pressure 1 Agent, B 1 The formulation is 5% HCl +8% acetic acid +15% ammonium chloride +15% formaldehyde +2% dodecyltributylphosphine bromide +1% tetradecyltrimethylammonium chloride +0.1% cationic polyacrylamide +2% urea +1% potassium iodide +2% oleic imidazoline +2% disodium ethylenediaminetetraacetate, the remainder being water.
Step three: injection of displacing acid C into a formation below formation fracture pressure 1 Agent C 1 The formulation is composed of 15% by volume of HCl +0.1% sulfomethylated polyacrylamide +2% oleic imidazoline +2% disodium ethylenediaminetetraacetate, the remainder being water.
Step four: injection of displacing fluid D into the formation 1 Agent, D 1 The agent is clear water.
Step five: and closing the well for 6 hours, and opening the well for flowback.
Example 2
And (3) carrying out acid fracturing measure modification by using b-well engineering modification of the S gas field as an implementation object and utilizing a high-temperature carbonate rock reservoir deep acidification method. The well b is a carbonate gas well, the lithology is limestone, and the reservoir temperature is 196 ℃. And determining the modification mode to be conventional acidification according to the reservoir characteristics.
The method comprises the following steps: injecting A into the stratum under the maximum injection capacity according to the capacity of the wellhead equipment 2 Agent, A 2 The agent composition is 5% by weight of HCl +0.1% sulfomethylated polyacrylamide +2% oleic acid imidazoline +2% disodium ethylenediaminetetraacetate, the rest is water.
Step two: injecting retarded acid B into stratum under the maximum injection capacity according to the capacity of wellhead equipment 2 Agent, B 2 The formulation consists of 5% by volume HCl +5% acetic acid +15% ammonium chloride +15% formaldehyde +5% hydroxyethylidene diphosphonic acid +2% tributyltetradecylphosphonium chloride +1% dodecyltrimethylammonium chloride +0.1% cationic polyacrylamide +2% urea +2% ethanol +1% antimony trioxide +2% oleic imidazoline +2% disodium ethylenediaminetetraacetate, the remainder being water.
Step three: injection of displacing acid C into a formation below formation fracture pressure 2 Agent, C 2 The agent composition is 20% by weight of HCl +0.1% sulfomethylated polyacrylamide +2% oleic acid imidazoline +2% disodium ethylenediaminetetraacetate, and the balance of water.
Step four: injection of a displacing liquid D into the formation 2 Agent, D 2 The agent is clear water.
Step five: and closing the well for 6 hours, and opening the well for flowback.
Example 3
C-well engineering reconstruction of an S gas field is taken as an implementation object, and acid fracturing measure reconstruction is performed by utilizing a high-temperature carbonate rock reservoir deep acidizing method. The well c is a carbonate gas well, the lithology is limestone, and the reservoir temperature is 198 ℃. And determining the modification mode to be conventional acidification according to the reservoir characteristics.
The method comprises the following steps: injecting A into the stratum under the maximum injection capacity according to the capacity of the wellhead equipment 3 Agent, A 3 The formulation is composed of 3% of HCl +2% acetic acid +0.1% sulfomethylated polyacrylamide +2% oleic imidazoline +2% ethylenediaminetetraacetic acidSodium and the balance water.
Step two: injecting retarded acid B into stratum under the maximum injection capacity according to the capacity of wellhead equipment 3 Agent, B 3 The agent consists of 5 percent of acetic acid, 15 percent of ammonium chloride, 15 percent of formaldehyde, 15 percent of diethyl triaminepentaacetic acid, 2 percent of tetradecyl trimethyl ammonium chloride, 1 percent of dodecyl trimethyl ammonium chloride, 0.1 percent of cationic polyacrylamide, 2 percent of urea, 2 percent of ethanol, 1 percent of potassium iodide, 2 percent of oleic imidazoline, 2 percent of ethylene diamine tetraacetic acid and the balance of water.
Step three: injection of displacing acid C into a formation below formation fracture pressure 3 Agent, C 3 The agent composition is 18% HCl +0.1% sulfomethylated polyacrylamide +2% oleic acid imidazoline +2% disodium ethylenediaminetetraacetate, and the balance water.
Step four: injection of displacing fluid D into the formation 3 Agent, D 3 The agent is clear water.
Step five: and closing the well for 8 hours, and opening the well for flowback.
And (3) contrastive analysis of acidification effect:
in the S gas field of the embodiment, the reservoir lithology is carbonate rock, the reservoir temperature is 140-200 ℃, and the gas well with the reservoir temperature in the interval of 140-160 ℃ is mainly operated by gelled acid. However, the ultrahigh temperature well, especially the well over 180 ℃, has been operated for many times, and because of the high burial depth, the rock is compact, the ground stress is high, and the power of the wellhead equipment is limited, acid liquor is not injected into the stratum. By adopting the method provided by the invention and adopting the low-viscosity acid liquid, the well a, the well b and the well c can smoothly inject the acid liquid into the stratum. Due to the action of multiple retarded acids, the deep reconstruction and communication effect on the stratum is realized, and the yield increasing effect is good. Compared with the traditional acidification reconstruction measures, the method well achieves the purpose of ultrahigh temperature deep well acidification reconstruction in the same operation block.
The daily natural gas production of the well is 9.19 multiplied by 10 before the operation of the well a 4 m 3 Natural gas production in the day after operation 25.5X 10 4 m 3 。
The daily natural gas production of the well is 6.15 multiplied by 10 before the operation of the b well 4 m 3 Natural gas produced in the day after operation is 27.3 multiplied by 10 4 m 3 。
The daily natural gas production of the well is 8.26 multiplied by 10 before the operation of the c well 4 m 3 Natural gas produced in the day after operation 29.1X 10 4 m 3 。
Slow rate test analysis (experimental temperature 90 ℃, 150 ℃, 200 ℃):
the results of the experiments are shown in Table 1, comparing the retardation effect of different acid systems, with reference to an acid rock reaction of 20% HCl at 90 ℃.
Table 1 data illustrates: at 90 ℃, the maximum slow rate of the acid liquid system for the 3 types of carbonate rock reservoirs commonly used at present is only 83 percent, and the 3 types of acid liquid systems all reduce H by improving the viscosity + The mass transfer coefficient is used for reducing the acid rock reaction speed, but the deep well is difficult to inject under high viscosity; 2#, 5#, 6#, and 7# are all viscosity reduction H + The mass transfer coefficient reduces the acid-rock reaction rate, and 1# and 3# reduce the acid-rock reaction rate by preventing the acid-rock contact through the barrier film. These 6 sets of experiments demonstrated that it was difficult to achieve a high slow rate from a single factor controlling the reaction rate; the sum of the speed slowing rates of 1#, 2#, 3# and 4# is 83.5 percent, and the speed slowing rate of 5# is up to 96 percent, so that the synergistic speed slowing effect of multiple actions is far more efficient than that of single-factor control; the viscosity data can show that the viscosities of 2# and 5# are far less than 6#, 7# and 8#, so that the extremely low viscosity can double the acid-rock retardation under the action of multiple retardations.
TABLE 1 comparison of retarding effects of different acid solutions at 90 deg.C
Remarking: (1) the retarder is dodecyl tributyl phosphonium bromide; the retarding thickener is cationic polyacrylamide; the retarding synergist is antimony trioxide; the retarding dispersant is urea; (2) Gelled acid, crosslinked acid, VES acid are the most common acid systems currently used for acidizing carbonate reservoirs. The acid liquid thickener is hydrophobic associated polyacrylamide, the cross-linking agent is urotropine, and the diverting agent is erucamide propyl hydroxysulfobetaine.
At 150 ℃, 200 ℃: the acid-rock reaction speeds of different acid liquids are tested for comparison, the reference gelled acid (which is more applied at present) is calculated by the retarded rate, and the experimental result is shown in table 2.
TABLE 2 acid-rock reaction rates at 200 ℃ with different acid liquors
The reaction rate of all acid and rock rapidly increases from 150 ℃ to 200 ℃. The acid-rock reaction speeds of No. 2, no. 5, no. 6 and No. 7 are increased in magnitude, and the acid-rock reaction speeds of the No. 1 and No. 4 systems are increased by relatively small times which are respectively 3.9 and 2.5 times because of containing the retarder, so that the multiple-retarding acid liquid system provided by the invention has excellent high-temperature stability, and the multiple-retarding synergistic effect is more excellent than the single-retarding effect. The retarded rate shows that the synergistic effect of different materials can efficiently realize retarded acid-rock reaction in a high-temperature environment. The multiple retarded acid liquid system provided by the invention has an excellent retarding effect at 200 ℃, and can be used for acidification of high-temperature and ultrahigh-temperature deep carbonate reservoirs.
In the 4# acid solution, the retarder can be adsorbed on the surface of the rock to prevent the acid from contacting the rock; the retarder dispersing agent can reduce the aggregation of the retarder and enhance the adsorption of the retarder; the surface adsorption of the retarder and the rock core is dynamic adsorption, and the retarder synergist can fill the vacancy of the dynamic adsorption, so that the firmness of adsorption and blocking is improved; the slow thickening agent is difficult to effectively reduce H under low concentration + The mass transfer speed of the retarder can effectively improve the directional arrangement effect of the retarder and reduce the dynamic movement speed of the retarder. Under the high-temperature environment, the retarding effect of the 4# acid liquid is greatly improved compared with that of a single material through the synergistic effect of multiple materials, and a high-concentration thickening agent is not added, so that the pollution of the thickening agent to the stratum and the high-viscosity injection difficulty are reduced.
Claims (10)
1. A high-temperature carbonate rock reservoir deep acidizing method sequentially comprises the following steps:
(1) Injecting a preflush A agent into a reformed formation, wherein the preflush A agent comprises the following components in percentage by weight: 1-5% of acid liquor, wherein the acid liquor is one or more of hydrochloric acid, acetic acid, formic acid and oxalic acid, 0.01-0.2% of thickening agent, 0.5-2% of corrosion inhibitor, 0.5-2% of iron ion stabilizer, 0-10% of filter-reducing agent and the balance of water;
(2) Injecting a retarding acid B agent into the reformed formation, wherein the retarding acid B agent comprises the following components in percentage by weight: 15-50% of acid liquor, wherein the acid liquor is one or more of hydrochloric acid, acetic acid, formic acid, oxalic acid, authigenic acid and chelating acid, 1-5% of retarder, 0.01-0.2% of retarder thickener, 1-5% of retarder dispersant, 1-5% of retarder synergist, 0.5-2% of corrosion inhibitor, 0.5-2% of iron ion stabilizer, 0-10% of filter-reducing agent and the balance of water;
(3) Injecting a displacing acid C agent into the reformed formation, wherein the displacing acid C agent comprises the following components in percentage by weight: 15-20% of acid liquor, wherein the acid liquor is one or more of hydrochloric acid, acetic acid and formic acid, 0.01-0.2% of thickening agent, 0.5-2% of corrosion inhibitor, 0.5-2% of iron ion stabilizer, 0-10% of filter-reducing agent and the balance of water;
(4) Injecting a displacement fluid D agent into the reformed formation, wherein the displacement fluid D agent is clear water or liquid nitrogen;
(5) Closing the well for 0.5-8 hours, and opening the well for flowback.
2. A high temperature carbonate reservoir deep acidizing method according to claim 1, wherein said viscosifying agent is polyacrylamide and its derivatives or guar gum and its derivatives.
3. The method as claimed in claim 1, wherein the retarder is one or more selected from dodecyl dimethyl betaine, dodecyl bis hydroxyethyl methyl ammonium chloride, dodecyl triethanolamine sulfate, dodecyl dimethyl hydroxypropyl sulfobetaine, cocamidopropyl betaine, lauramidopropyl hydroxysulfobetaine, lauramidopropyl betaine, cocomethyl monoethanolamide, coconut diethanolamide, cocoyl alanine triethanolamine, cocoamidopropyl hydroxysulfobetaine, tributyl tetradecyl phosphorus chloride, dodecyl tributyl phosphine bromide, dodecyl trimethyl ammonium chloride, and tetradecyl trimethyl ammonium chloride.
4. The method for deep acidizing of a high temperature carbonate reservoir as claimed in claim 1 wherein said retarded viscosifying agent is cationic polyacrylamide.
5. The method for deep acidizing of a high-temperature carbonate rock reservoir, as claimed in claim 1, wherein said retardant dispersant is one or more of urea, formamide, acetamide, propionamide, N-dimethylformamide, ethanol and ethylene glycol.
6. The method of claim 1, wherein the retarder synergist is one or more of potassium iodide, alum, potassium aluminum sulfate dodecahydrate, and antimony trioxide.
7. A method for deep acidizing of a high temperature carbonate reservoir as per claim 1 wherein said authigenic acid is comprised of ammonium chloride and formaldehyde in the same mass ratio.
8. The method of claim 1, wherein the chelating acid is one or more of ethylenediaminetetraacetic acid, glutamic acid-N, N-diacetic acid, hydroxyethylidene diphosphonic acid, diethyltriaminepentaacetic acid, and N-hydroxyethylethylenediaminetriacetic acid.
9. The method for deep acidizing of a high-temperature carbonate rock reservoir, as claimed in claim 1, wherein said corrosion inhibitor is one or more of methyl alkynol, methyl pentynol, diethylenetriamine, butynol ethanol, hexamethylenetetramine, oleic acid imidazoline.
10. The method for deep acidizing of a high-temperature carbonate rock reservoir as claimed in claim 1, wherein the iron ion stabilizer is one or more of disodium ethylene diamine tetraacetate, citric acid, nitrilotriacetic acid, L-glutamic acid and isoascorbic acid.
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| CN116622363A (en) * | 2023-07-26 | 2023-08-22 | 东营市百扬石油科技有限责任公司 | Deep acidification method for petroleum exploitation |
| CN116622363B (en) * | 2023-07-26 | 2023-09-26 | 东营市百扬石油科技有限责任公司 | Deep acidification method for petroleum exploitation |
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