A composition and an atomized acid containing the same

Abstract

The application provides a composition and an atomized acid containing the same. The composition comprises hydrochloric acid, an atomization stabilizer, a corrosion inhibitor, an iron ion stabilizer and water. The atomized acid is obtained by mixing and atomizing the composition and inert gas in an atomization generator. The atomization stability of the atomized acid is 66.57% to 85.32%, the corrosion rate of the atomized acid on a P110S metal coupon is 1.31 g / (m 2 ·h) at 140 DEG C, and the acid-rock reaction rate is 1.2847 to 1.8634 x 10 ‑ 5 mol·cm ‑2 ·s ‑1 The atomized acid has high atomization stability, good corrosion resistance and good retardation, and can ensure that the acidizing process is safe and effective.

Description

Technical Field

[0001] This invention belongs to the field of reservoir stimulation technology in oil and gas field development engineering, and particularly relates to a composition and atomizing acid containing the composition. Background Technology

[0002] Carbonate reservoirs account for approximately 70% of global oil and gas resources, with fractured-vuggy reservoirs making up one-third of them. The Tarim Oilfield in Xinjiang, my country, has proven reserves of over 1 billion tons of fractured-vuggy reservoirs, indicating enormous development potential. For carbonate reservoirs, acid fracturing is the primary method for improving reservoir structure and increasing production capacity. The fractured-vuggy carbonate reservoirs in the Tarim Oilfield are deeply buried, with large cavities dominating the reservoir space. Fractures serve as the main connecting channels, and fluid flow within the reservoir exhibits pipe-like characteristics.

[0003] To address the issues of insufficient energy and rising water cut leading to rapid production decline and low recovery rates during the development of some fractured-vuggy units, a development model combining water injection for oil displacement in single-well fractured-vuggy units and water injection for oil displacement in multi-well fractured-vuggy units has been developed, effectively improving reservoir recovery. For relatively closed single-well fractured-vuggy units, when injected water cannot reach the high parts of the karst caverns, nitrogen is injected into the single-well fractured-vuggy unit to establish an artificial gas phase. This can effectively replace the remaining oil at the high parts while replenishing formation energy, lowering the oil-water interface, and thus improving crude oil recovery. Since its large-scale implementation, single-well gas injection in fractured-vuggy carbonate reservoirs in the Tarim Oilfield has achieved good results, with 40% of wells achieving an oil replacement rate greater than 1, and oil production accounting for 85% of the total gas injection production. Preliminary findings suggest the existence of a gas penetration mechanism to connect with new reservoirs. To further increase the probability of gas connecting with new reservoirs, a "nitrogen injection + acidizing" construction method can be used to affect, etch, and activate underdeveloped gas drive channels, expanding the range of reserves utilized by gas injection.

[0004] Due to the unique structure of fractured-vuggy reservoirs, when using conventional acids for matrix acidizing, the injected acid may accumulate in large quantities within the caverns, hindering the extension of vermiform pores and making it difficult to form continuous and effective oil and gas flow channels. Furthermore, the deep burial and high formation temperatures of fractured-vuggy reservoirs in the Tarim Oilfield present numerous challenges to the acid, particularly its temperature resistance, manifesting primarily as excessively rapid reaction rates that hinder vermiform pore formation. Overly rapid acid-rock reaction rates can lead to over-acidification of the near-wellbore area while the deeper layers remain insufficiently acidified, potentially even causing acidizing failure in severe cases. Therefore, a novel production enhancement process for fractured-vuggy reservoirs, combining nitrogen injection and acidizing, has been developed, employing nitrogen atomization acidizing. Current research on atomized acid mainly focuses on atomization generator equipment, atomized acid preparation system, simulation studies on the particle size and distribution of atomized acid in the wellbore, and research on acidizing methods and processes of atomized acid during construction. No specific atomized acid formula for fractured-vuggy carbonate reservoirs has yet been proposed. Summary of the Invention

[0005] The first aspect of the present invention provides a composition comprising hydrochloric acid, a fogging stabilizer, a corrosion inhibitor, an iron ion stabilizer, and water.

[0006] In one specific embodiment of the present invention, the volume of the composition is 100%, the volume concentration of the hydrochloric acid is 48.4% to 80.6%, the volume concentration of the atomization stabilizer is 0.2% to 0.5%, the volume concentration of the corrosion inhibitor is 2% to 4%, the volume concentration of the iron ion stabilizer is 1%, and the volume concentration of the water is 15.4% to 48.4%.

[0007] Preferably, the volume of the composition is 100%, the volume concentration of the hydrochloric acid is 48.4% to 80.6%, the volume concentration of the atomization stabilizer is 0.2% to 0.5%, the volume concentration of the corrosion inhibitor is 2% to 2.5%, the volume concentration of the iron ion stabilizer is 1%, and the volume concentration of the water is 15.7% to 48.4%.

[0008] Preferably, the hydrochloric acid is industrial hydrochloric acid with a mass fraction of 31% HCl.

[0009] In one specific embodiment of the present invention, the atomization stabilizer is selected from at least one of nonylphenol polyoxyethylene ether (i.e., OP-10), polytrisiloxane (i.e., SIL408), and sodium dodecyl sulfate (i.e., SDS);

[0010] Preferably, the atomization stabilizer is nonylphenol polyoxyethylene ether.

[0011] In one specific embodiment of the present invention, the corrosion inhibitor is selected from at least one of EEH-160, XC-13, DCA-6, GDHS-1, BD1-20G and BFC-140;

[0012] Preferably, the corrosion inhibitor is BFC-140.

[0013] In one specific embodiment of the present invention, the iron ion stabilizer is at least one of EET, XC-16, YH02-1, BD1-2, CT-T, TW-200 and KMS-7;

[0014] Preferably, the iron ion stabilizer is XC-16.

[0015] A second aspect of the present invention provides a method for preparing a composition as described in the first aspect of the present invention, comprising the following steps:

[0016] 1) Mix hydrochloric acid and water to obtain a diluted solution;

[0017] 2) Add the corrosion inhibitor, iron ion stabilizer and atomization stabilizer to the diluent to obtain the composition.

[0018] A third aspect of the present invention provides a method for preparing atomized acid, comprising the following steps:

[0019] The composition and an inert gas are mixed and atomized to obtain the atomized acid;

[0020] The composition is the composition described in the first aspect of the present invention or the composition prepared by the method described in the second aspect of the present invention.

[0021] In one specific embodiment of the present invention, the composition and inert gas are injected into an atomizing generator to perform the mixed atomization;

[0022] Preferably, the gas-liquid volume flow rate ratio of the injected inert gas and the composition is (10000 to 100000):1;

[0023] Preferably, the gas-liquid volume flow ratio of the injected inert gas and the composition is 15000:1;

[0024] Preferably, the inert gas is nitrogen; and / or

[0025] The atomizer is a dual-flow Venturi atomizer;

[0026] Preferably, the temperature of the mixed atomization is an ambient temperature higher than 0°C.

[0027] The fourth aspect of the present invention provides an atomizing acid, which is an atomizing acid prepared by the method described in the third aspect of the present invention.

[0028] The application of any one of the compositions described in the first aspect of the present invention, the compositions prepared by the method described in the second aspect of the present invention, the atomized acid prepared by the method described in the third aspect of the present invention, and the atomized acid described in the fourth aspect of the present invention in reservoir stimulation in oil and gas field development engineering, especially in gas injection expansion of fractured-vuggy carbonate reservoirs.

[0029] In this invention, the corrosion inhibitor EEH-160 was purchased from Beijing Hongyi Enze Energy Technology Co., Ltd.

[0030] Corrosion inhibitors XC-13 and GDHS-1 were both purchased from Karamay Zhongke Hengxin Technology Co., Ltd.

[0031] Corrosion inhibitor DCA-6 was purchased from Beijing Kemaishi Oilfield Chemical Technology Co., Ltd.

[0032] Corrosion inhibitor BD1-20G was purchased from Sichuan Beide Petroleum Technology Development Co., Ltd.

[0033] Corrosion inhibitor BFC-140 was purchased from Beijing Baofengchun Petroleum Technology Co., Ltd.

[0034] The iron ion stabilizer EET was purchased from Beijing Hongyi Enze Energy Technology Co., Ltd.

[0035] Iron ion stabilizer XC-16 was purchased from Karamay Zhongke Hengxin Technology Co., Ltd.

[0036] Iron ion stabilizer BD1-2 was purchased from Sichuan Beide Petroleum Technology Development Co., Ltd.

[0037] Iron ion stabilizer YH02-1 was purchased from Korla Yiyuanhao Petroleum Technology Service Co., Ltd.

[0038] Iron ion stabilizer CT-T was purchased from Beijing Kemtech Petroleum Technology Engineering Development Co., Ltd.

[0039] Iron ion stabilizer TW-200 was purchased from Urumqi Kefazhan Fine Chemical Co., Ltd.

[0040] The iron ion stabilizer KMS-7 was purchased from Beijing Kemaishi Oilfield Chemical Agent Technology Co., Ltd.

[0041] The beneficial effects of this invention are:

[0042] To address the lack of atomizing acid formulations in existing technologies, this invention provides a composition and an atomizing acid containing the same. The composition comprises hydrochloric acid, an atomization stabilizer, a corrosion inhibitor, an iron ion stabilizer, and water. The atomizing acid containing the composition is obtained by mixing and atomizing the composition with nitrogen gas in an atomizing generator. The atomization stability of the atomizing acid after simulated wellbore transport is 66.57% to 85.32%, and the corrosion rate on P110S metal clips at 140°C is only 1.31 g / (m³). 2 The acid-rock reaction rate at 140 °C was 1.2847 to 1.8634 × 10⁻⁶ h. -5 mol·cm -2 ·s -1 It has high atomization stability, good corrosion inhibition and slowing effect, and has good atomization and slowing effect, which is conducive to increasing the acidizing range, connecting more relatively closed fracture units, and obtaining better production increase effect. Moreover, it has low corrosiveness to the underground tubing of oil and gas wells, ensuring the safe and effective implementation of the atomized acidizing process. Attached Figure Description

[0043] Figure 1 This is a graph showing the change in atomization stability of the atomizing acid as a function of the volume concentration of the atomizing stabilizer in the composition in which the atomizing acid is used.

[0044] Figure 2 Curves showing the molar concentration of HCl and the acid-rock reaction rate in the composition used for atomized acid;

[0045] Figure 3 The curves show the molar concentration of HCl in a conventional liquid acid and the acid-rock reaction rate. Detailed Implementation

[0046] The present invention will be further described below with reference to the embodiments. However, the embodiments of the present invention are merely illustrative examples and should not be construed as limiting the present invention under any circumstances.

[0047] The corrosion inhibitor BFC-140 used in Examples 1 to 15 and Comparative Examples 1 to 13 was purchased from Beijing Baofengchun Petroleum Technology Co., Ltd.; the iron ion stabilizer XC-16 was purchased from Karamay Zhongke Hengxin Technology Co., Ltd.

[0048] Example 1

[0049] Preparation of the composition:

[0050] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.4 mL of water while stirring to obtain a diluted solution;

[0051] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.2 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer OP-10 is 0.2%.

[0052] Preparation of atomized acid:

[0053] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0054] Example 2

[0055] Preparation of the composition:

[0056] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.3 mL of water while stirring to obtain a diluted solution;

[0057] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.3 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer OP-10 is 0.3%.

[0058] Preparation of atomized acid:

[0059] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0060] Example 3

[0061] Preparation of the composition:

[0062] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.2 mL of water while stirring to obtain a diluted solution;

[0063] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.4 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent and stir until homogeneous to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer OP-10 is 0.4%.

[0064] Preparation of atomized acid:

[0065] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0066] Example 4

[0067] Preparation of the composition:

[0068] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.1 mL of water while stirring to obtain a diluted solution;

[0069] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.5 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer OP-10 is 0.5%.

[0070] Preparation of atomized acid:

[0071] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0072] Comparative Example 1

[0073] Preparation of the composition:

[0074] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.5 mL of water while stirring to obtain a diluted solution;

[0075] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.1 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer OP-10 is 0.1%.

[0076] Preparation of atomized acid:

[0077] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0078] Comparative Example 2

[0079] Preparation of the composition:

[0080] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 47.6 mL of water while stirring to obtain a diluted solution;

[0081] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 1 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer OP-10 is 1%.

[0082] Preparation of atomized acid:

[0083] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0084] Comparative Example 3

[0085] Preparation of the composition:

[0086] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 47.1 mL of water while stirring to obtain a diluted solution;

[0087] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 1.5 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer OP-10 is 1.5%.

[0088] Preparation of atomized acid:

[0089] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0090] Comparative Example 4

[0091] Preparation of conventional liquid acids

[0092] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.6 mL of water while stirring to obtain a diluted solution;

[0093] 2) Add 2 mL of corrosion inhibitor BFC-140 and 1 mL of iron ion stabilizer XC-16 to the diluent, stir well, and obtain conventional liquid acid.

[0094] Example 5

[0095] Preparation of the composition:

[0096] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 47.9 mL of water while stirring to obtain a diluted solution;

[0097] 2) Add 2.5 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.2 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer OP-10 is 0.2%.

[0098] Preparation of atomized acid:

[0099] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0100] Example 6

[0101] Preparation of the composition:

[0102] 1) Add 64.5 mL of HCl (31% by mass) industrial hydrochloric acid to 31.8 mL of water while stirring to obtain a diluted solution;

[0103] 2) Add 2.5 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.2 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 20% and the volume concentration of atomization stabilizer OP-10 is 0.2%.

[0104] Preparation of atomized acid:

[0105] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0106] Example 7

[0107] Preparation of the composition:

[0108] 1) Add 80.6 mL of 31% HCl industrial hydrochloric acid to 15.7 mL of water while stirring to obtain a diluted solution;

[0109] 2) Add 2.5 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.2 mL of nonylphenol polyoxyethylene ether (i.e., OP-10) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 25% and the volume concentration of atomization stabilizer OP-10 is 0.2%.

[0110] Preparation of atomized acid:

[0111] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0112] Comparative Example 5

[0113] Preparation of conventional liquid acids:

[0114] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.1 mL of water while stirring to obtain a diluted solution;

[0115] 2) Add 2.5 mL of corrosion inhibitor BFC-140 and 1 mL of iron ion stabilizer XC-16 to the diluent, stir well, and obtain conventional liquid acid.

[0116] Comparative Example 6

[0117] Preparation of conventional liquid acids:

[0118] 1) Add 64.5 mL of 31% HCl industrial hydrochloric acid to 32 mL of water while stirring to obtain a diluted solution;

[0119] 2) Add 2.5 mL of corrosion inhibitor BFC-140 and 1 mL of iron ion stabilizer XC-16 to the diluent, stir well, and obtain conventional liquid acid.

[0120] Comparative Example 7

[0121] Preparation of conventional liquid acids:

[0122] 1) Add 80.6 mL of 31% HCl industrial hydrochloric acid to 15.9 mL of water while stirring to obtain a diluted solution;

[0123] 2) Add 2.5 mL of corrosion inhibitor BFC-140 and 1 mL of iron ion stabilizer XC-16 to the diluent, stir well, and obtain conventional liquid acid.

[0124] Example 8

[0125] Preparation of the composition:

[0126] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.4 mL of water while stirring to obtain a diluted solution;

[0127] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.2 mL of polytrisiloxane (i.e., SIL408) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SIL408 is 0.2%.

[0128] Preparation of atomized acid:

[0129] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0130] Example 9

[0131] Preparation of the composition:

[0132] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.3 mL of water while stirring to obtain a diluted solution;

[0133] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.3 mL of polytrisiloxane (i.e., SIL408) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SIL408 is 0.3%.

[0134] Preparation of atomized acid:

[0135] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0136] Example 10

[0137] Preparation of the composition:

[0138] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.2 mL of water while stirring to obtain a diluted solution;

[0139] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.4 mL of polytrisiloxane (i.e., SIL408) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SIL408 is 0.4%.

[0140] Preparation of atomized acid:

[0141] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0142] Example 11

[0143] Preparation of the composition:

[0144] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.1 mL of water while stirring to obtain a diluted solution;

[0145] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.5 mL of polytrisiloxane (i.e., SIL408) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SIL408 is 0.5%.

[0146] Preparation of atomized acid:

[0147] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0148] Comparative Example 8

[0149] Preparation of the composition:

[0150] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.5 mL of water while stirring to obtain a diluted solution;

[0151] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.1 mL of polytrisiloxane (i.e., SIL408) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SIL408 is 0.1%.

[0152] Preparation of atomized acid:

[0153] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0154] Comparative Example 9

[0155] Preparation of the composition:

[0156] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 47.6 mL of water while stirring to obtain a diluted solution;

[0157] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 1 mL of polytrisiloxane (i.e., SIL408) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SIL408 is 1%.

[0158] Preparation of atomized acid:

[0159] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0160] Comparative Example 10

[0161] Preparation of the composition:

[0162] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 47.1 mL of water while stirring to obtain a diluted solution;

[0163] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 1.5 mL of polytrisiloxane (i.e., SIL408) to the diluent, stir evenly to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SIL408 is 1.5%.

[0164] Preparation of atomized acid:

[0165] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0166] Example 12

[0167] Preparation of the composition:

[0168] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.4 mL of water while stirring to obtain a diluted solution;

[0169] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.2 mL of sodium dodecyl sulfate (SDS) to the diluent, stir well to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SDS is 0.2%.

[0170] Preparation of atomized acid:

[0171] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0172] Example 13

[0173] Preparation of the composition:

[0174] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.3 mL of water while stirring to obtain a diluted solution;

[0175] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.3 mL of sodium dodecyl sulfate (SDS) to the diluent, stir well to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SDS is 0.3%.

[0176] Preparation of atomized acid:

[0177] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0178] Example 14

[0179] Preparation of the composition:

[0180] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.2 mL of water while stirring to obtain a diluted solution;

[0181] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.4 mL of sodium dodecyl sulfate (SDS) to the diluent, stir well to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SDS is 0.4%.

[0182] Preparation of atomized acid:

[0183] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0184] Example 15

[0185] Preparation of the composition:

[0186] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.1 mL of water while stirring to obtain a diluted solution;

[0187] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.5 mL of sodium dodecyl sulfate (SDS) to the diluent, stir well to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SDS is 0.5%.

[0188] Preparation of atomized acid:

[0189] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0190] Comparative Example 11

[0191] Preparation of the composition:

[0192] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 48.5 mL of water while stirring to obtain a diluted solution;

[0193] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 0.1 mL of sodium dodecyl sulfate (SDS) to the diluent, stir well to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SDS is 0.1%.

[0194] Preparation of atomized acid:

[0195] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0196] Comparative Example 12

[0197] Preparation of the composition:

[0198] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 47.6 mL of water while stirring to obtain a diluted solution;

[0199] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 1 mL of sodium dodecyl sulfate (SDS) to the diluent, stir well to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SDS is 1%.

[0200] Preparation of atomized acid:

[0201] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0202] Comparative Example 13

[0203] Preparation of the composition:

[0204] 1) Add 48.4 mL of 31% HCl industrial hydrochloric acid to 47.1 mL of water while stirring to obtain a diluted solution;

[0205] 2) Add 2 mL of corrosion inhibitor BFC-140, 1 mL of iron ion stabilizer XC-16 and 1.5 mL of sodium dodecyl sulfate (SDS) to the diluent, stir well to obtain the composition, wherein the mass fraction of HCl is 15% and the volume concentration of atomization stabilizer SDS is 1.5%.

[0206] Preparation of atomized acid:

[0207] At room temperature (i.e., 25°C), nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in this embodiment at a flow rate of 20 mL / min, respectively, according to a gas-liquid volume flow rate ratio of 15000:1, to obtain atomized acid.

[0208] Evaluation of atomized acid

[0209] A. Atomization stability measurement

[0210] During the preparation of atomizing acids in Examples 1 to 4, Examples 8 to 15, Comparative Examples 1 to 3, and Comparative Examples 8 to 13, the atomization stability of the atomizing acids was determined according to the following method, with specific steps as follows:

[0211] a. In the preparation of atomized acid, the gas (i.e. nitrogen) inlet of the dual-flow Venturi atomizer is connected to an air compressor, the liquid (i.e. composition) inlet is connected to a high-pressure acid-resistant pump, and the dual-flow outlet is connected to a simulated wellbore; the simulated wellbore (made of plexiglass, with an inner diameter of 60 mm, a length of 6 m, and a pressure resistance of 11.0 MPa) is fixed on a steel support perpendicular to the horizontal plane, and a liquid collection device is installed at the wellhead of the simulated wellbore;

[0212] b. Nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition at a flow rate of 20 mL / min at a gas-liquid volume ratio of 15000:1 to obtain atomized acid. The simulated wellbore bottom volume V was collected using a liquid collection device within a time period t.

[0213] According to V l =Q l ×t (Formula 1) calculates the injection volume within time period t;

[0214] In formula 1, Q l Injection rate, mL / min;

[0215] t is the injection time, in minutes;

[0216] V lThe volume of the injected solution is in mL.

[0217] According to V g =Q g ×t (Formula 2) calculates the gas injection volume within time period t;

[0218] In formula 2, Q g Injection rate, mL / min;

[0219] t is the injection time, in minutes;

[0220] V g The volume of gas injected is in mL;

[0221] according to Calculate the atomization stability of atomized acid after it has been transported through a simulated wellbore.

[0222] In Formula 3, V l The volume of the injected solution is in mL.

[0223] V represents the volume of the accumulated liquid, in mL.

[0224] In the preparation of atomized acid in Examples 1 to 4, Examples 8 to 15, Comparative Examples 1 to 3, and Comparative Examples 8 to 13, the atomization stability of the atomized acid after being transported through a simulated wellbore was measured according to steps a and b above, with a time t of 3 min. The results are shown in Table 1. Figure 1 .

[0225] Table 1. Atomization stability of atomized acid after simulated wellbore migration

[0226]

[0227] Combining the data in Table 1 and Figure 1 As can be seen from the curves, in the process of preparing atomizing acid, the optimal volume concentrations of atomizing stabilizer OP-10 (0.2%), SIL408 (0.3%), and SDS (0.5%) in the composition are as follows: the corresponding atomization stability rates of the atomizing acid prepared from these compositions are 85.32%, 82.31%, and 81.35%, respectively. This shows that when the atomizing stabilizer in the composition is at its optimal volume concentration, the atomization stability rate of the prepared atomizing acid remains above 80% after simulated wellbore transport, reaching a maximum of 85.32%, proving that the atomizing acid further prepared from the composition of this invention has a better atomization effect. Furthermore, Figure 1The curves and data in Table 1 show that, under otherwise identical conditions, the atomization stability of the atomized acid prepared by any of the three available atomization stabilizers provided by this invention, after simulated wellbore transport, first increases and then decreases with the increase of the volume concentration of the atomization stabilizer in the composition used. By limiting the volume concentration of the atomization stabilizer in the composition to the range of 0.2% to 0.5%, the atomization stability of the atomized acid prepared by using a composition containing any of the three atomization stabilizers can be maintained above 65% after simulated wellbore transport.

[0228] B. Corrosion Rate Measurement

[0229] The corrosion rate of the atomized acid prepared in Example 1 and the conventional liquid acid prepared in Comparative Example 4 on the metal feedstock was determined by the dynamic weight loss method in the industry standard SY / T5405-1996 "Test Methods and Evaluation Indicators for Corrosion Inhibitors for Acidizing" at 140℃ and 60 r / min for 4 hours. The conventional liquid acid prepared in Comparative Example 4 was used as a control to evaluate the corrosivity of the atomized acid prepared in Example 1 to the wellbore. The specific method is as follows:

[0230] i. Metal hangers: Take two P110S metal hangers of the same specifications, measure and record their initial mass and surface area respectively;

[0231] ii. Corrosiveness of atomized acid: Nitrogen gas was injected into a dual-flow venturi atomizer at a flow rate of 300 L / min and the composition prepared in Example 1 at a flow rate of 20 mL / min, according to a gas-liquid volume flow ratio of 15000:1. The resulting atomized acid was injected into a reactor equipped with a P110S metal plate. The reactor was then heated to 140°C. After 4 hours, the metal plate was removed, washed with water, dried at 100°C, and weighed.

[0232] iii. Corrosivity of conventional liquid acid: A P110S metal plate was placed in a reactor containing the conventional liquid acid prepared in Comparative Example 4, and it was completely immersed in the conventional liquid acid. The reactor was then sealed, and the pressure inside the reactor was set to 0.5 MPa. The reactor was heated to 140°C. After 4 hours, the metal plate was removed, washed with water, dried at 100°C, and weighed.

[0233] according to Calculate the corrosion rates of atomized acid and conventional liquid acid on metal pads;

[0234] In Formula 4, V acid — Average corrosion rate, g / (m 2 ·h);

[0235] Δm—Weight loss of the metal hanging piece, g;

[0236] A—Surface area of ​​the metal hanger, mm 2 ;

[0237] Δt — is the test time, in hours.

[0238] The specific results are shown in Table 2.

[0239] Table 2. Corrosion rates of P110S metal fins by atomized acid and conventional liquid acid at 140℃

[0240]

[0241] As shown in Table 2, the atomized acid prepared further using the composition prepared in Example 1 exhibits a corrosion rate of only 1.31 g / (m²) on the P110S metal pads at 140°C. 2 ·h), less than 2g / (m 2 The corrosion rate was relatively low (·h). From the formulation, the type and amount of corrosion inhibitor in the conventional liquid acid prepared in Comparative Example 4 were consistent with those in the composition used in the atomized acid prepared in Example 1. However, the conventional liquid acid prepared in Comparative Example 4 exhibited a corrosion rate as high as 18.92 g / (m³) on the P110S metal pad at 140°C. 2 The corrosion rate (·h) is 14.4 times that of the atomized acid prepared in Example 1. This indicates that the atomized acid prepared in Example 4 has a significantly reduced corrosiveness to P110S metal plates compared to conventional liquid acids, effectively ensuring the safe and effective implementation of the atomized acid acidification process.

[0242] C. Determination of acid-rock reaction rate

[0243] Acid-rock reaction kinetics experiments were conducted to determine the reaction rates of the atomized acid prepared in Examples 5 to 7, the conventional liquid acid prepared in Comparative Examples 5 to 7, and the carbonate core, and to evaluate the retardation effect of the atomized acid. The specific methods are as follows:

[0244] (1) Experimental core: Take fractured-cavity carbonate cores from Tahe Oilfield, measure and record their initial mass;

[0245] (2) Wrap the experimental core with a rubber sleeve and fix it on the rotor inside the rotating rock disc reactor;

[0246] (3) Determination of the reaction rate between atomized acid and experimental core:

[0247] ① Connect the gas (i.e., nitrogen) inlet of the dual-flow Venturi atomizer to an air compressor, and the liquid (i.e., composition) inlet to a high-pressure acid-resistant pump. Inject nitrogen at a rate of 300 L / min and the composition at a rate of 20 mL / min into the dual-flow Venturi atomizer to prepare atomized acid. Connect the dual-flow outlet to an intermediate container so that the prepared atomized acid enters the intermediate container from the outlet of the dual-flow Venturi atomizer.

[0248] ② Open the outlet valve of the intermediate container and the inlet valve of the reactor, pump 0.5MPa of nitrogen into the intermediate container, and close the outlet valve of the intermediate container and the inlet valve of the reactor after the atomized acid has completely entered the reactor.

[0249] ③ Heat the reactor to 140℃, set the rotor speed inside the reactor to 500r / min, turn on the constant temperature system, and let the atomized acid in the reactor react with the experimental core for 30min;

[0250] ④ After the reaction is complete, turn off the constant temperature system, open the inlet valve of the reactor and the outlet valve of the intermediate container, pump 0.5 MPa of nitrogen into the reactor, and wait for the atomized acid in the reactor to completely return to the intermediate container. Take a sample from the intermediate container and determine the molar concentration of HCl in the residual acid after the reaction using a 0.1 mol / L sodium hydroxide standard solution according to the acid-base neutralization titration method. Then, discharge the residual acid after the reaction from the intermediate container and take out the experimental core after the reaction from the reactor. Wash it with water, dry it at 100℃, weigh it, and record the mass of the experimental core after the reaction.

[0251] (4) Determination of the reaction rate between conventional liquid acid and experimental core:

[0252] Ⅰ Add conventional liquid acid to the reactor, heat the reactor to 140°C, set the rotor speed inside the reactor to 500 r / min, turn on the constant temperature system, operate the lifting system to immerse the end face of the experimental core into the conventional liquid acid, and let the atomized acid in the reactor react with the experimental core for 30 min;

[0253] II. After the reaction is completed, the constant temperature system is turned off. The residual acid after the reaction is sampled from the reaction vessel. According to the acid-base neutralization titration method, the molar concentration of HCl in it is determined using a 0.1 mol / L sodium hydroxide standard solution and recorded. The experimental core after the reaction is taken out, washed with water, dried at 100℃, weighed, and the mass of the experimental core after the reaction is recorded.

[0254] (5) Through J = kC m (Formula 6) and lgJ=lgk+mlgC (Formula 7) are used to calculate the reaction rate of atomized acid and experimental core, and the reaction rate of conventional liquid acid and experimental core.

[0255] In Formula 5, J represents the dynamic reaction rate of the acid-rock mixture, in mol / (cm²). 2 ·s);

[0256] V is the volume of the acid solution participating in the reaction, in mL;

[0257] C0 represents the molar concentration of HCl in the composition used for atomized acid or the molar concentration of HCl in conventional liquid acid, in mol / L.

[0258] C1 is the molar concentration of HCl in the residual acid, in mol / L;

[0259] t1 is the start time of the acid-rock reaction, in seconds;

[0260] t2 is the end time of the acid-rock reaction, in seconds;

[0261] S represents the acid-rock reaction contact area, in cm². 2 ;

[0262] In Formula 6, k is the reaction rate constant;

[0263] m is the reaction order;

[0264] C represents the molar concentration of HCl in the composition used for atomized acid or the molar concentration of HCl in conventional liquid acid at time t, in mol / L.

[0265] In Formula 7, lgJ is the logarithm of the dynamic reaction rate of acid rocks;

[0266] lgk is the logarithm of the reaction rate constant;

[0267] m is the reaction order;

[0268] lgC is the logarithm of the molar concentration of HCl in the composition used for atomizing acid at time t, or the logarithm of the molar concentration of HCl in conventional liquid acid.

[0269] Following the steps described above, the reaction rates of the atomized acid prepared in Examples 5 to 7, the conventional liquid acid prepared in Comparative Examples 5 to 7, and the carbonate core were measured respectively. Each atomized acid prepared in each example and each conventional liquid acid prepared in each comparative example used a separate experimental core. Experimental cores from two or more examples or comparative examples were not mixed. Specific experimental results are shown in Tables 3 and 4.

[0270] Table 3. Results of reaction rate determination between atomized acid and experimental core.

[0271]

[0272] Based on the data in Table 4, a functional relationship curve was plotted with the logarithm of the reaction rate J as the ordinate and the logarithm of the HCl molar concentration in the residual acid as the ordinate. The specific details are as follows: Figure 2As shown, the slope of the plotted straight line is the reaction order m, and the intercept is the logarithm of the reaction rate constant lgk.

[0273] The solution can be obtained from curve regression:

[0274] The reaction order m = 0.6717;

[0275] The logarithm of the reaction rate constant, lgk, is -5.32.

[0276] The reaction rate constant k = 4.786 × 10 -6 ;

[0277] Therefore, at 140℃, the kinetic equation for the reaction of atomized acid-rock is J = 4.786 × 10⁻⁶. -6 C 0.6717 .

[0278] Table 4. Results of reaction rate determination for conventional liquid acid and experimental core samples

[0279]

[0280] Based on the data in Table 5, a functional relationship curve was plotted with the logarithm of the reaction rate J as the ordinate and the logarithm of the HCl molar concentration in the residual acid as the ordinate. The specific details are as follows: Figure 3 As shown, the slope of the plotted straight line is the reaction order m, and the intercept is the logarithm of the reaction rate constant lgk.

[0281] The solution can be obtained from curve regression:

[0282] The reaction order m = 0.6092;

[0283] The logarithm of the reaction rate constant, lgk, is -4.203.

[0284] The reaction rate constant k = 2.4946 × 10 -5 ;

[0285] Therefore, at 140℃, the kinetic equation for the reaction between conventional liquid acid and rock is J = 2.4946 × 10⁻⁶. -5 C 0.6092 .

[0286] Combining the data in Tables 3 and 4, and from... Figure 2 , Figure 3 The obtained acid-rock reaction kinetic equations show that, under the same HCl mass fraction in the composition used, the acid-rock reaction rate of atomized acid is an order of magnitude smaller than that of conventional liquid acid. At HCl mass fractions of 15%, 20%, and 30%, the acid-rock reaction rate of atomized acid is consistently around 2 × 10⁻⁶. -5 mol·cm -2 ·s -1The acid-rock reaction rate of conventional liquid acids is 15.46 × 10⁻⁶. -5 mol·cm -2 ·s -1 Up to 21.71×10 -5 mol·cm -2 ·s -1 Greater than 2×10 -5 mol·cm -2 ·s -1 This indicates that atomized acid has a better slowing effect than conventional liquid acid under high temperature conditions of 140℃, which is conducive to expanding the acidification range, connecting more relatively closed slotted units, and obtaining better production increase and transformation effects.

[0287] While the present invention has been described with reference to specific embodiments, those skilled in the art will understand that various changes can be made without departing from the true spirit and scope of the invention. Furthermore, numerous modifications can be made to the subject, spirit, and scope of the invention to suit specific situations, materials, material compositions, and methods. All such modifications are included within the scope of the claims of the present invention.

Claims

1. An atomizing acid obtained by atomizing a mixture comprising hydrochloric acid, an atomization stabilizer, a corrosion inhibitor, an iron ion stabilizer, and water, and an inert gas; in, The atomization stabilizer is nonylphenol polyoxyethylene ether or polytrisiloxane; The total volume of the composition is 100%, the volume concentration of the hydrochloric acid is 48.4% to 80.6%, the volume concentration of the atomization stabilizer is 0.2% to 0.5%, the volume concentration of the corrosion inhibitor is 2% to 4%, the volume concentration of the iron ion stabilizer is 1%, and the volume concentration of the water is 15.4% to 48.4%. The hydrochloric acid is industrial hydrochloric acid with a mass fraction of 31% HCl.

2. The atomizing acid according to claim 1, characterized in that, The atomization stabilizer is nonylphenol polyoxyethylene ether.

3. The atomized acid according to claim 1 or 2, characterized in that, The corrosion inhibitor is selected from at least one of EEH-160, XC-13, DCA-6, GDHS-1, BD1-20G and BFC-140.

4. The atomized acid according to claim 1 or 2, characterized in that, The iron ion stabilizer is at least one of EET, XC-16, YH02-1, BD1-2, CT-T, TW-200 and KMS-7.

5. The atomizing acid according to claim 1 or 2, characterized in that, The composition was prepared according to the following steps: 1) Mix hydrochloric acid and water to obtain a diluted solution; 2) Add the corrosion inhibitor, iron ion stabilizer and atomization stabilizer to the diluent to obtain the composition.

6. The atomized acid according to claim 1 or 2, characterized in that, The composition and inert gas are injected into an atomizer for mixing and atomization.

7. The atomizing acid according to claim 1 or 2, characterized in that, The gas-liquid volume flow rate ratio of the injected inert gas and the composition is (10000 to 100000):

1.

8. The atomizing acid according to claim 1 or 2, characterized in that, The inert gas is nitrogen.

9. The application of atomized acid according to any one of claims 1 to 8 in reservoir stimulation in oil and gas field development projects.

10. The application of atomized acid according to any one of claims 1 to 8 in gas injection expansion of fractured-vuggy carbonate reservoirs.

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