A method for determining dolomite and limestone acid rock reaction rate competition

Abstract

The application discloses a method for determining dolomite and limestone acid rock competition reaction rate, comprising the following steps: S1, acid rock reaction of acid liquid and rock sample, and obtaining residual acid liquid after acid rock reaction; S2, taking three groups of samples from the residual acid liquid; S3, determining the molar concentration of residual acid liquid for one group of samples; S4, determining the molar concentration of Ca ion and Mg ion respectively for the other two groups of samples by using chemical precipitation method; S5, calculating the acid rock reaction rate of dolomite and limestone respectively through the chemical reaction equation of dolomite and limestone and the acid rock reaction rate calculation formula. The application can calculate the acid rock reaction rate of dolomite and limestone under different acid liquid systems respectively in the case of coexistence, and provides the basis of acid fracturing process parameters for the reservoir taking high-quality dolomite as the main transformation target.

Description

Technical Field

[0001] This invention relates to the field of acidification technology, and more specifically, to a method for determining the competitive reaction rate of acidification between dolomite and limestone. Background Technology

[0002] The reservoirs consist of alternating layers of carbonate dolomite and limestone, with high-quality dolomite reservoirs being the primary development target. However, due to the overall low porosity and permeability of these reservoirs, there is virtually no natural production capacity, making acid fracturing an inevitable choice for efficient development. Initially, numerical simulations and experimental evaluations were primarily used to optimize acid fracturing process parameters. The experimental evaluations focused mainly on dolomite. However, due to the significant difference in acid-rock reaction rates between dolomite and limestone, and the lack of effective experimental methods to separately measure the acid-rock reaction rates of both dolomite and limestone in the presence of both, the accuracy of the acid fracturing process parameter design was limited, resulting in significant differences in the effectiveness of acid fracturing.

[0003] Patent CN202411414868.6 discloses a method for predicting acid-rock reaction rates based on mass transfer control. It mainly uses Newton's law of cooling, Fick's first law, and dimensionless mass transfer equations to calculate the acid-rock reaction rates under pure dolomite and pure limestone conditions through numerical simulation. However, it lacks the ability to measure the acid-rock reaction rates of both dolomite and limestone when they coexist.

[0004] Patent CN202410756411.7 discloses a differential weight analysis method for the chemical kinetic reaction rate of shale multi-minerals, which calculates the reaction rate of siliceous minerals in shale by utilizing the weight loss relationship between carbonate minerals and siliceous minerals in shale. However, this method is not applicable to carbonate reservoirs.

[0005] Patent CN202211292441.4 discloses a method for testing the reaction rate of authigenic acid-rock reaction. The method calculates the reaction rate of authigenic acid-rock reaction by measuring the amount of carbonate rock consumed in the reaction process at different stages. However, this method is only applicable to a single dolomite or limestone reservoir and is only suitable for authigenic acid.

[0006] Patent CN202310294502.9 discloses a method for simulating carbonate rock acidification based on an improved dual-scale model. This invention mainly obtains the reaction rate and acid concentration parameters under experimental conditions through rotating rock disk experiments, but it does not separately measure the acidification reaction rate of dolomite and limestone when they coexist.

[0007] Therefore, there is currently a lack of effective experimental evaluation methods for reservoirs with alternating development of dolomite and limestone, in order to optimize acid fracturing process parameters.

[0008] In view of the above, this application is hereby submitted. Summary of the Invention

[0009] The existing technology has the problem of lacking effective experimental evaluation methods to separately measure the acid-rock reaction rate of dolomite and limestone when they coexist. In order to solve the above problem, the present invention provides a method for measuring the acid-rock competition reaction rate of dolomite and limestone, which can calculate the acid-rock reaction rate under different acid systems when dolomite and limestone coexist, and provide a basis for acid fracturing process parameters for reservoirs with high-quality dolomite as the main target for stimulation.

[0010] This invention is achieved through the following technical solution:

[0011] This invention provides a method for determining the competitive reaction rate between dolomite and limestone-acidic rocks, comprising the following steps:

[0012] S1, acid-rock reaction is carried out between acid solution and rock sample to obtain the remaining acid solution after the acid-rock reaction;

[0013] S2, Take three sets of samples from the remaining acid solution;

[0014] S3, determine the molar concentration of residual acid in a set of samples;

[0015] S4. For the other two groups of samples, the chemical precipitation method was used to determine the molar concentrations of Ca ions and Mg ions, respectively.

[0016] S5. The acid-rock reaction rates of dolomite and limestone are calculated using the chemical reaction equations and acid-rock reaction rate calculation formulas for dolomite and limestone, respectively.

[0017] In a specific implementation, the method for step S1 is as follows:

[0018] The molar concentration of the prepared acid solution was determined by titration with phenolphthalein indicator and denoted as C0.

[0019] The diameter and thickness of the reaction surface of the rock sample are measured to obtain the surface area of ​​the rock sample, which is denoted as S;

[0020] Acid-rock reaction was carried out between acid solution and rock sample, and the reaction start time t0 and reaction end time t were recorded respectively;

[0021] A residual acid solution with a volume of V is obtained.

[0022] In one specific embodiment, the acid solution formulation includes hydrochloric acid, corrosion inhibitor, corrosion inhibitor synergist, gelling agent, iron ion stabilizer, clay stabilizer, and drainage aid.

[0023] In one specific embodiment, step S2 is performed by taking three groups of samples from the remaining acid solution, with each group of samples containing at least three or more samples.

[0024] In a specific embodiment, step S3 is specifically performed by determining the average molar concentration of the residual acid solution using a phenolphthalein indicator titration method, denoted as C.

[0025] In a specific implementation, step S4 is performed as follows:

[0026] Weigh a set of samples to obtain the average volume V1. Prepare calcium oxalate precipitate by chemical precipitation method, with an average mass m1. Calculate Ca. 2+ The average molar concentration is C1 = m1 ÷ 56 ÷ V1.

[0027] In a specific implementation, step S4 is performed as follows:

[0028] Weigh a set of samples to obtain the average volume V1. Add dilute hydrochloric acid to the set of samples for acidification, and adjust the pH of the solution to 4-5 with ammonia. After adding excess ammonium oxalate and reacting fully, filter to obtain the precipitated calcium oxalate, dry and ignite to constant weight, and weigh the average mass as m1.

[0029] In a specific implementation, step S4 is performed as follows:

[0030] Weigh a set of samples to obtain the average volume V1. Prepare magnesium pyrophosphate by chemical precipitation, and weigh the average mass m2. Calculate Mg. 2+ The average molar concentration is C2 = m2 ÷ 222 ÷ V2.

[0031] In a specific implementation, step S4 is performed as follows:

[0032] Weigh a set of samples to obtain an average volume V2. Add dilute hydrochloric acid to the samples for acidification, and adjust the pH of the solution to 4-5 with ammonia. After adding excess ammonium oxalate and reacting fully, filter the precipitate. Add dilute sulfuric acid to the filtrate for acidification, heat to boiling, add ammonia to the filtrate to adjust the pH to 10-11, add diammonium hydrogen phosphate, filter to obtain the precipitate magnesium ammonium phosphate, calcine to obtain magnesium pyrophosphate, and weigh the average mass as m2.

[0033] In a specific embodiment, in step S5, the chemical reaction equation for dolomite is MgCa(CO3)2+4HCl=MgCl2+CaCl2+2H2O+2CO2, and the molar concentration of acid consumed by dolomite is calculated to be 4C2.

[0034] In a specific implementation, the formula for calculating the competitive reaction rate of dolomite-acid rock is as follows:

[0035]

[0036] In a specific embodiment, in step S5, the chemical reaction equation of the limestone is CaCO3 + 2HCl = CaCl2 + H2O + CO2, and the molar concentration of acid consumed by the limestone is calculated to be 2(C1-C2).

[0037] In a specific implementation, the formula for calculating the competing reaction rate between limestone and acid rock is as follows:

[0038]

[0039] In one specific implementation, the ratio of the competing reaction rates of dolomite and limestone acid rock is 2C2:(C1-C2).

[0040] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0041] 1. The present invention provides a method for determining the acid-rock competition reaction rate of dolomite and limestone. By measuring the acid concentration, Ca ion concentration and Mg ion concentration in the remaining acid solution after the acid-rock reaction, and then using the chemical reaction equation and the acid-rock reaction rate calculation formula, it is possible to separately measure the acid-rock competition reaction rate of dolomite and limestone when they coexist.

[0042] 2. The present invention provides a method for determining the acid-rock competition reaction rate of dolomite and limestone, which can utilize existing common chemical reaction reagents and experimental devices to determine the acid-rock reaction rate of each of the two lithologies when dolomite and limestone are present at the same time, and is applicable to the current mainstream acid liquid system.

[0043] 3. The method for determining the competitive reaction rate between dolomite and limestone acid rocks provided in this embodiment of the invention can provide experimental data support for optimizing acid fracturing process parameters in reservoirs with high-quality dolomite as the main target of stimulation, and is of great significance for the experimental evaluation and process parameter design of carbonate reservoir stimulation. Attached Figure Description

[0044] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic flowchart of the method for determining the competitive reaction rate of dolomite and limestone acid rocks according to the present invention. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0047] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known materials or methods have not been specifically described in order to avoid obscuring the invention.

[0048] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0049] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60–120 and 80–110 are listed for a specific parameter, it is understood that ranges of 60–110 and 80–120 are also expected. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0" and "5" have been listed in this document; "0-5" is merely a shortened representation of these numerical combinations. Furthermore, when a parameter is described as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc. Unless otherwise specified, all steps in this application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), indicating that step (c) can be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0050] The reservoirs consist of alternating layers of carbonate dolomite and limestone, with high-quality dolomite reservoirs being the primary development target. However, due to the overall low porosity and permeability of these reservoirs, there is virtually no natural production capacity, making acid fracturing an inevitable choice for efficient development. Initially, numerical simulations and experimental evaluations were primarily used to optimize acid fracturing process parameters. The experimental evaluations focused mainly on dolomite. However, due to the significant difference in acid-rock reaction rates between dolomite and limestone, and the lack of effective experimental methods to separately measure the acid-rock reaction rates of both dolomite and limestone in the presence of both, the accuracy of the acid fracturing process parameter design was limited, resulting in significant differences in the effectiveness of acid fracturing.

[0051] To solve the above technical problems,

[0052] This invention provides a method for determining the competitive reaction rate between dolomite and limestone-acidic rocks, comprising the following steps:

[0053] Step 1: Add the additives to the hydrochloric acid solution according to the acid solution formula and mix them evenly. Take out a portion of the prepared acid solution and determine its molar concentration (C0) by titration with phenolphthalein indicator solution.

[0054] Step 2: Measure the diameter and thickness of the reaction surface of the rock sample, and determine the surface area of ​​the rock sample as S.

[0055] Step 3: Set the temperature of the rotating rock disc apparatus, the speed of the stirrer, and the pressure according to the experimental requirements. Preheat the preheating kettle, the acid-rock reaction kettle, and the rock sample. After the temperature of the experimental instruments and the experimental sample has stabilized, add the preheated acid solution and the rock sample to the acid-rock reaction kettle and record the reaction start time as t0.

[0056] Step 4: After the reaction time is reached, record the reaction time as t. Take 9 samples continuously and evenly from the bottom of the acid rock reactor. Among them, the average molar concentration of residual acid of samples 1, 2 and 3 is determined by titration with phenolphthalein indicator solution to be C.

[0057] Step 5: Close the experimental apparatus. After depressurization, drain the acid from the bottom of the acid rock reactor, seal it, and calculate the acid volume as V, where V includes the sampling volume.

[0058] Step 6: Weigh samples 4, 5, and 6, and determine their average volume as V1. Acidify each sample with dilute hydrochloric acid, and adjust the pH of the solution to 4-5 with ammonia. After adding excess ammonium oxalate ((NH4)2C2O4) and allowing it to react completely, filter to obtain the precipitate calcium oxalate (CaC2O4). Wash the precipitate with dilute ammonium oxalate solution, dry it, and ignite it to constant weight. Weigh the average mass as m1 and calculate the Ca... 2+ The average molar concentration is C1 = m1 ÷ 56 ÷ V1.

[0059] Step 7: Weigh samples 7, 8, and 9, and determine their average volume as V2. Acidify each sample with dilute hydrochloric acid and boil. Adjust the pH of the solution to 4-5 with ammonia. Add excess ammonium oxalate ((NH4)2C2O4) and allow it to react completely. Filter the resulting precipitate, add dilute sulfuric acid to the filtrate, and heat to boiling. Adjust the pH of the filtrate to 10-11 with ammonia, add diammonium hydrogen phosphate ((NH4)2HPO4), filter to obtain the precipitate magnesium ammonium phosphate (MgNH4PO4), calcine it to obtain magnesium pyrophosphate (Mg2P2O7), weigh its average mass as m2, and calculate Mg. 2+ The average molar concentration is C2 = m1 ÷ 222 ÷ V2.

[0060] Step 8: Based on the reaction equations MgCa(CO3)2+4HCl=MgCl2+CaCl2+2H2O+2CO2 and CaCO3+2HCl=CaCl2+H2O+CO2, calculate the molar concentration of acid consumed by the dolomite as 4C2 and the molar concentration of acid consumed as 2(C1-C2).

[0061] Step 9: Calculate the competitive reaction rate of dolomite-acid rock.

[0062] Step 10: Calculate the competing reaction rate between limestone and acid rock.

[0063] Step 11: Calculate the ratio of the competing reaction rates between dolomite and limestone acid rock as 2C2:(C1-C2).

[0064] Example 1

[0065] This invention provides a method for determining the competitive reaction rate of dolomite and limestone-acidic rocks, comprising the following steps:

[0066] Step 1: According to the acid solution formula of 20.0% hydrochloric acid + 3.0% corrosion inhibitor + 1.0% corrosion inhibitor synergist + 0.5% gelling agent + 2.0% iron ion stabilizer + 1.0% clay stabilizer + 1.0% drainage aid, add the additives to the hydrochloric acid solution and mix evenly. Take out a portion of the prepared acid solution and determine its molar concentration using the phenolphthalein indicator method. It is 6.02 mol / L.

[0067] Step two: Use vernier calipers to measure the diameter of the rock sample as 25 mm and its length as 200 mm, and calculate its reaction surface area as 0.0167 m². 2 .

[0068] Step 3: According to the experimental requirements, set the temperature of the rotating rock disc apparatus to 140℃, the stirrer speed to 500r / min, and the pressure to 7MPa. Preheat the preheating kettle, the acid-rock reaction kettle, and the rock sample. After the temperature of the experimental instruments and the experimental sample stabilizes, add the preheated acid solution and rock sample to the acid-rock reaction kettle and record the reaction start time as 0.

[0069] Step 4: After the reaction time is reached, record the reaction time as 300s. Take 9 samples continuously and evenly from the bottom of the acid rock reactor. Among them, the average concentration of residual acid in samples 1, 2 and 3 is determined to be 3mol / L by titration with phenolphthalein indicator solution.

[0070] Step 5: Close the experimental apparatus. After depressurization, drain the acid from the bottom of the acid rock reactor and seal it. Calculate the acid volume as 500ml.

[0071] Step Six: Weigh samples 4, 5, and 6, each with an average volume of 20 ml. Acidify each sample with dilute hydrochloric acid, and adjust the pH of the solution to 4-5 with ammonia. After adding excess ammonium oxalate ((NH4)2C2O4) and allowing it to react completely, filter to obtain the precipitate calcium oxalate (CaC2O4). Wash with dilute ammonium oxalate solution, dry, and ignite to constant weight. Weigh the precipitate, and its average mass is 5 g. Calculate the Ca... 2+The average molar concentration is C1 = 5 ÷ 56 ÷ 20 = 4.46 × 10⁻⁶ -6 mol / L.

[0072] Step 7: Weigh samples 7, 8, and 9 to an average volume of 20 ml. Acidify each sample with dilute hydrochloric acid and boil. Adjust the pH of the solution to 4-5 with ammonia. Add excess ammonium oxalate ((NH4)2C2O4) and allow it to react completely. Filter the resulting precipitate. Acidify the filtrate with dilute sulfuric acid and heat to boiling. Adjust the pH of the filtrate to 10-11 with ammonia. Add diammonium hydrogen phosphate ((NH4)2HPO4), filter to obtain the precipitate magnesium ammonium phosphate (MgNH4PO4), calcine it to obtain magnesium pyrophosphate (Mg2P2O7), weigh it to an average mass of 2 g, and calculate the Mg content. 2+ The average molar concentration is C2 = 2 ÷ 222 ÷ 20 = 4.51 × 10 -6 mol / L.

[0073] Step 8: Based on the reaction equations MgCa(CO3)2 + 4HCl = MgCl2 + CaCl2 + 2H2O + 2CO2 and CaCO3 + 2HCl = CaCl2 + H2O + CO2, calculate the molar concentration of acid consumed by the dolomite as 1.8 × 10⁻⁶. -6 The molar concentration of acid consumed by the limestone was 8.0 × 10⁻⁶ mol / L. -6 mol / L.

[0074] Step nine: Calculate the competitive reaction rate of dolomite-acid rock to be 5.53 × 10⁻⁶. -6 mol / cm 2 ·s.

[0075] Step 10: The competing reaction rate between limestone and acid rock is calculated to be 2.46 × 10⁻⁶. -5 mol / cm 2 ·s.

[0076] Step 11: The ratio of the competing reaction rates between dolomite and limestone acid rock is calculated to be 0.224.

[0077] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for determining the competitive reaction rate between dolomite and limestone-acidic rocks, characterized in that, Includes the following steps: S1, acid-rock reaction is carried out between acid solution and rock sample to obtain the remaining acid solution after the acid-rock reaction; S2, Take three sets of samples from the remaining acid solution; S3, determine the molar concentration of residual acid in a set of samples; S4, the molar concentrations of Ca ions and Mg ions were measured for the other two groups of samples, respectively; S5. The acid-rock reaction rates of dolomite and limestone are calculated using the chemical reaction equations and acid-rock reaction rate calculation formulas for dolomite and limestone, respectively.

2. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 1, characterized in that, The specific method for step S1 is as follows: The molar concentration of the prepared acid solution was determined by titration with phenolphthalein indicator and denoted as C0. The diameter and thickness of the reaction surface of the rock sample are measured to obtain the surface area of ​​the rock sample, which is denoted as S; Acid-rock reaction was carried out between acid solution and rock sample, and the reaction start time t0 and reaction end time t were recorded respectively; A residual acid solution with a volume of V is obtained.

3. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 2, characterized in that, The acid solution formulation includes hydrochloric acid, corrosion inhibitor, corrosion inhibitor synergist, gelling agent, iron ion stabilizer, clay stabilizer, and drainage aid.

4. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 1, characterized in that, The specific method of step S2 is to take three groups of samples from the remaining acid solution, each group of samples including at least three samples.

5. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 2, characterized in that, The specific method for step S3 is to determine the average molar concentration of the residual acid solution by titration with phenolphthalein indicator solution, denoted as C.

6. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 5, characterized in that, The specific method for step S4 is as follows: Weigh a set of samples to obtain the average volume V1. Prepare calcium oxalate precipitate by chemical precipitation method, with an average mass m1. Calculate Ca. 2+ The average molar concentration is C1 = m1 ÷ 56 ÷ V1.

7. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 6, characterized in that, The specific method for step S4 is as follows: Weigh a set of samples to obtain the average volume V1. Add dilute hydrochloric acid to the set of samples for acidification, and adjust the pH of the solution to 4-5 with ammonia. After adding excess ammonium oxalate and reacting fully, filter to obtain the precipitated calcium oxalate, dry and ignite to constant weight, and weigh the average mass as m1.

8. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 7, characterized in that, The specific method for step S4 is as follows: Weigh a set of samples to obtain the average volume V1. Prepare magnesium pyrophosphate by chemical precipitation, and weigh the average mass m2. Calculate Mg. 2+ The average molar concentration is C2 = m2 ÷ 222 ÷ V2.

9. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 8, characterized in that, The specific method for step S4 is as follows: Weigh a set of samples to obtain an average volume V2. Add dilute hydrochloric acid to the samples for acidification, and adjust the pH of the solution to 4-5 with ammonia. After adding excess ammonium oxalate and reacting fully, filter the precipitate. Add dilute sulfuric acid to the filtrate for acidification, heat to boiling, add ammonia to the filtrate to adjust the pH to 10-11, add diammonium hydrogen phosphate, filter to obtain the precipitate magnesium ammonium phosphate, calcine to obtain magnesium pyrophosphate, and weigh the average mass as m2.

10. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 8, characterized in that, In step S5, the chemical reaction equation for dolomite is MgCa(CO3)2+4HCl=MgCl2+CaCl2+2H2O+2CO2, and the molar concentration of acid consumed by dolomite is calculated to be 4C2.

11. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 8, characterized in that, The formula for calculating the competitive reaction rate of dolomite-acid rock is as follows:

12. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 8, characterized in that, In step S5, the chemical reaction equation for the limestone is CaCO3 + 2HCl = CaCl2 + H2O + CO2, and the molar concentration of acid consumed by the limestone is calculated to be 2(C1-C2).

13. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 8, characterized in that, The formula for calculating the competing reaction rate between limestone and acid rock is as follows:

14. The method for determining the competitive reaction rate between dolomite and limestone acid rocks according to claim 8, characterized in that, The ratio of the competing reaction rates between dolomite and limestone acid rocks is 2C2:(C1-C2).

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