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High-temperature sandstone oil reservoir retarded acid and preparation method thereof

A sandstone reservoir, retarded acid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of fast reaction speed of acid rock, weak retarded acidity, limited dissolution ability, etc., to achieve delayed reaction The effect of speed, unblocking formation, and strong dissolution ability

Inactive Publication Date: 2016-06-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently used retarding acid still has two problems. The first problem is that the acid rock reacts quickly under high temperature conditions and the retarding effect is poor; the second problem is that the retarding acid has weak acidity and poor dissolution ability. Acid acidification increases the treatment radius of the acid solution, but the final acidification effect is still poor due to the limited dissolution ability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Weigh 100g of β-cyclodextrin, put it into a mortar, add 30ml of distilled water, and grind until it becomes a paste;

[0021] (2) Weigh 12.7g of methanesulfonic acid powder and add it to the above-mentioned β-cyclodextrin paste;

[0022] (3) Grind the mixture for 2 hours to obtain a uniform paste;

[0023] (4) Put the paste in a drying oven and keep the temperature at 50°C for 12 hours to obtain the inclusion compound of methanesulfonic acid and β-cyclodextrin;

[0024] (5) Add the prepared clathrate and 13.05g of ammonium fluoride into 100ml of water, and stir well until the solid powder is completely dissolved to obtain a high-temperature sandstone reservoir retarded acid solution.

Embodiment 2

[0026] (1) Weigh 113.5g of β-cyclodextrin, put it into a mortar, add 40ml of distilled water, and grind until it becomes a paste;

[0027] (2) Weigh 9.61g of methanesulfonic acid powder and add it to the above-mentioned β-cyclodextrin paste;

[0028] (3) Grind the mixture for 1.5 hours to obtain a uniform paste;

[0029] (4) Put the paste in a drying oven and keep the temperature at 50°C for 8 hours to obtain the inclusion complex of methanesulfonic acid and β-cyclodextrin;

[0030] (5) Add the prepared clathrate and 11.4g of ammonium fluoride into 90ml of water, and stir well until the solid powder is completely dissolved to obtain a high-temperature sandstone reservoir tardy acid solution.

Embodiment 3

[0032] (1) Weigh 113.5g of β-cyclodextrin, put it into a mortar, add 50ml of distilled water, and grind until it becomes a paste;

[0033] (2) Weigh 19.22g of methanesulfonic acid powder and add it to the above-mentioned β-cyclodextrin paste;

[0034] (3) Grind the mixture for 2 hours to obtain a uniform paste;

[0035] (4) Put the paste in a drying oven and keep the temperature at 50°C for 12 hours to obtain the inclusion compound of methanesulfonic acid and β-cyclodextrin;

[0036] (5) Add the prepared clathrate and 45.6g of ammonium fluoride into 60ml of water and stir well until the solid powder is completely dissolved to obtain a high-temperature sandstone reservoir tardy acid solution.

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Abstract

The invention provides a high-temperature sandstone oil reservoir retarded acid and a preparation method thereof. The high-temperature sandstone oil reservoir retarded acid is composed of the raw materials of cyclodextrin, sulfonic acid and ammonium fluoride with a molar ratio of 1:1-2:2-8, the balance being water. The preparation method comprises the following steps: a, recrystallized and fully dried cyclodextrin is placed in a mortar; a proper amount of a solvent is added, and the mixture is stirred into a paste; b, sulfonic acid powder is added into the paste obtained in the step a, and the mixture is ground for 1-2h, such that a uniform viscos paste is obtained; the paste is subjected to constant-temperature drying for 8-12h under a temperature of 50 DEG C in a baking oven, such that a white powdery substance is obtained, wherein the substance is a clathrate of cyclodextrin and sulfonic acid; and c, ammonium fluoride is mixed with the clathrate obtained in the step b, such that the high-temperature sandstone oil reservoir retarded acid is obtained. Compared to existing retarded acids, the high-temperature sandstone oil reservoir retarded acid provided by the invention has the characteristics of high-temperature resistance, good retardance and high corrosion capacity.

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a high-temperature sandstone oil reservoir tardy acid for acidifying oil-water wells in oil field development and a preparation method thereof. Background technique [0002] During drilling, completion and production operations, oil and water wells are extremely vulnerable to damage, such as drilling fluid filtrate invasion, water sensitivity, particle migration, etc., which seriously affect the normal production of oil fields. Acidizing operation is an effective measure to relieve reservoir damage, improve oil well production capacity and water well water absorption capacity. It uses acid liquid to remove pollutants around production wells and water injection wells, and restore or increase the permeability of formations. Soil acid acidizing is the most commonly used acidizing measure for sandstone reservoirs, which has the advantages of low cost and strong dissolution abi...

Claims

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Application Information

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IPC IPC(8): C09K8/74
Inventor 张磊杜宝坛张星李强李建兵宋菲张君成梅华陈丽霞卢占国
Owner CHINA PETROLEUM & CHEM CORP
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