CN-118685171-B - Composition and atomized acid containing same

Abstract

The invention 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 injecting the composition and inert gas into an atomization generator for mixing and atomization. The atomization acid atomization stabilization rate is 66.57-85.32%, the corrosion rate to the P110S metal hanging sheet is 1.31 g/(m 2 .h), the acid rock reaction rate is 1.2847-1.8634 × ‑ 5 mol·cm ‑2 ·s ‑1 , the atomization stabilization rate is high, the corrosion inhibition performance is good, the retarding performance is good, and the safe and effective development of the atomization acid acidification process can be ensured.

Inventors

• ZHANG LUFENG
• HE JIAYUAN
• WANG HAIBO
• LI XIAOLONG

Assignees

• 中国石油化工股份有限公司
• 中国石油化工股份有限公司石油勘探开发研究院

Dates

Publication Date

20260508

Application Date

20230322

Claims (10)

1. 1. An atomized acid obtained by mixing and atomizing a composition comprising hydrochloric acid, an atomization stabilizer, a corrosion inhibitor, an iron ion stabilizer and water, and an inert gas; wherein the atomization stabilizer is nonylphenol polyoxyethylene ether or polysilicone; taking the total volume of the composition as 100%, the volume concentration of the hydrochloric acid is 48.4-80.6%, the volume concentration of the atomization stabilizer is 0.2-0.5%, the volume concentration of the corrosion inhibitor is 2-4%, the volume concentration of the iron ion stabilizer is 1%, and the volume concentration of the water is 15.4-48.4%; The hydrochloric acid is industrial hydrochloric acid with the mass fraction of HCl of 31%.
2. 2. The atomizing acid of claim 1, wherein the atomizing stabilizer is nonylphenol polyoxyethylene ether.
3. 3. 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. 4. The atomized acid of claim 1 or 2, wherein the iron ion stabilizer is at least one of EET, XC-16, YH02-1, BD1-2, CT-T, TW-200, and KMS-7.
5. 5. Atomized acid according to claim 1 or 2, characterized in that the composition is prepared according to the following steps: 1) Mixing hydrochloric acid and water to obtain a diluent; 2) And adding the corrosion inhibitor, the iron ion stabilizer and the atomization stabilizer into the diluent to obtain the composition.
6. 6. An atomized acid as claimed in claim 1 or claim 2 wherein the mixing and atomizing is carried out by injecting the composition and inert gas into an atomization generator.
7. 7. Atomized acid according to claim 1 or 2, characterized in that the ratio of the gas-liquid volume flow of the inert gas injected to the composition is (10000 to 100000): 1.
8. 8. Atomized acid according to claim 1 or 2, characterized in that the inert gas is nitrogen.
9. 9. Use of the atomized acid according to any one of claims 1 to 8 in reservoir engineering of oil and gas field development.
10. 10. Use of an atomized acid according to any one of claims 1 to 8 for gas injection dilatation of a fracture-cave carbonate reservoir.

Description

Composition and atomized acid containing same Technical Field The invention belongs to the technical field of reservoir reconstruction in oil and gas field development engineering, and particularly relates to a composition and atomized acid containing the composition. Background The carbonate oil gas resource accounts for about seven parts of the total global oil gas resource, and the fracture-cavity type oil deposit accounts for one third of the carbonate oil deposit. The accumulated exploratory reserves of the fracture-cavity type oil reservoirs of the Xinjiang Tahe oil fields in China are over 10 hundred million tons, and the development potential is huge. For carbonate reservoirs, acid fracturing technology is the primary means of reservoir improvement and capacity enhancement. The fracture-cavity type carbonate reservoir of the tower river oil field is buried deeply, the reservoir space is mainly a large cave, cracks are main communication channels, and the flow of fluid in the reservoir layer is represented as a pipe flow characteristic. Aiming at the problems of rapid decrease in yield, low production degree and the like caused by insufficient energy and water content rise in the development process of part of fracture-cavity units, a development mode of single-well fracture-cavity unit water injection oil displacement and multi-well fracture-cavity unit water injection oil displacement is formed, and the oil reservoir production degree is effectively improved. For a relatively closed single-well fracture-cavity unit, when injected water cannot reach the high position of the karst cave, nitrogen is injected into the single-well fracture-cavity unit, an artificial gas phase is established, and the energy of stratum can be supplemented, meanwhile, the residual oil at the high position can be effectively replaced, and the oil-water interface is depressed, so that the recovery degree of crude oil is improved. The single well gas injection of the fractured-vuggy carbonate reservoir in the tower river oil field is implemented on a large scale to obtain good effects, the oil exchange rate of the 40% oil well is greater than 1, the oil production accounts for 85% of the total gas injection yield, and a mechanism for gas penetration and communication of a new reservoir body is primarily considered. In order to further increase the probability of gas communication with a new reservoir, a construction mode of 'nitrogen injection and acidification' can be adopted to sweep, etch and start an underdeveloped gas driving channel, so that the reserve range for gas injection is enlarged. Because of the particularity of the fracture-cavity oil reservoir structure, when conventional acid is used for matrix acidification, injected acid liquid can be accumulated in the karst cavity in a large amount, the extension of the earthworm holes is affected, and continuous and effective oil gas seepage channels are difficult to form. In addition, the fracture-cavity type oil deposit of the tower river oil field is deep in burial, the stratum temperature is high, the high-temperature stratum environment also brings a plurality of problems to the acid liquor, and particularly the temperature resistance is mainly represented by the fact that the reaction speed is too high, and the earthworm holes are difficult to form. Too fast acid rock reaction speed can cause excessive acidification of stratum at the near well part, but insufficient acidification of deep part can cause failure of acidification construction even when the situation is serious. Based on the method, the composite process of nitrogen injection and acidification is improved to be a novel fracture-cavity oil reservoir yield increasing process method of nitrogen atomization acid acidification. The related research on the atomized acid at the present stage mainly focuses on the simulation research on the particle size and the distribution state of the atomized acid in a shaft and the research on the acidification method process of the atomized acid in construction, and a formula of the atomized acid for a fracture-cavity type carbonate reservoir is not explicitly proposed for a short time. Disclosure of Invention In a first aspect, the present invention provides a composition comprising hydrochloric acid, an atomization stabilizer, a corrosion inhibitor, an iron ion stabilizer, and water. In one embodiment of the invention, the composition is 100% by volume, the hydrochloric acid is 48.4% to 80.6% by volume, the atomization stabilizer is 0.2% to 0.5% by volume, the corrosion inhibitor is 2% to 4% by volume, the iron ion stabilizer is 1% by volume, and the water is 15.4% to 48.4% by volume; 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 t