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Solid acid for acid fracturing capacity increasing revamping

A solid acid and acid fracturing technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of retention, fluid loss control, premature acid release, etc.

Active Publication Date: 2012-09-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these solid acids have good water solubility and cannot maintain solid form under formation conditions. Although they can slow down the acid dissolution rate to a certain extent, they still cannot effectively solve the problem of fluid loss control and cannot ensure the maintenance of the overall main fractures. Effective acid corrosion, its effect is the same as that of retarded acid or organic acid system in the general sense, and there is no particularity or advantage
There is also the encapsulated acid (coated acid) technology proposed in U.S. Patent 6207620, which realizes acid release control through physical damage of the coating or degradation under formation conditions, but in construction operations, the physical properties of the encapsulated material Damage, or incomplete coating during preparation will lead to premature acid release

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: Accurately weigh 1.0g of chloroacetic acid, dichloroacetic acid, and trichloroacetic acid respectively, and dissolve them in three parts of 10ml of methylene chloride under normal temperature stirring, then weigh 5.0g of polylactic acid with a molecular weight of 5000, and then respectively Add 1.0g of ethylene glycol, put them in the above three solutions and stir to fully dissolve them, then place them in a watch glass, put them in a constant temperature oven at 40°C to dry for 12 hours, take out the dried product, and cool the low-temperature pulverizer with liquid nitrogen , under the condition of ensuring that the temperature of the material is lower than 45°C, crush it to 80 mesh solid powder, rinse or soak the three solid powders with 100ml of stearic acid aqueous solution with a concentration of 1% for 30min, filter and dry again to obtain three kinds of solid powder Powders of different solid acids. The obtained 3 parts of solid powders were all w...

Embodiment 2

[0025] Embodiment 2: Accurately weigh 1.0g, 2.0g, and 3.0g chloroacetic acid respectively, and dissolve them in three parts of 10ml methylene chloride respectively under stirring at room temperature, then respectively weigh 5.0g of polyglycolic acid with a molecular weight of 10000, and then add 1.0g of ethylene glycol monoester, respectively placed in the above three parts of the solution, stirred and fully dissolved, then placed in a watch glass, placed in a constant temperature oven at 40°C to dry for 12 hours, took out the dried product and cooled it with liquid nitrogen to a low-temperature pulverizer , under the condition of ensuring that the temperature of the material is lower than 45°C, crush it to a solid powder of 80 mesh, rinse or infiltrate the three solid powders with 100ml of 0.5% sodium oleate aqueous solution for 30 minutes, filter and dry again to obtain three kinds of solid powder Different solid acid powders. The 3 parts of solid powder obtained are all wei...

Embodiment 3

[0027]Embodiment 3: Accurately take by weighing three parts of 1.0g of dichloroacetic acid, dissolve in three parts of 10ml methylene chloride respectively, stir at normal temperature, then respectively weigh polylactic acid of three different molecular weights, molecular weight is respectively 5000, 10000, 30000, Add 1.0g of ethylene glycol ester to each part of 5.0g, place them in the above three solutions respectively, stir and fully dissolve them, place them in a watch glass, put them in a constant temperature oven at 40°C for 12 hours, and take out the dried product Use liquid nitrogen to cool the low-temperature pulverizer, and under the condition of ensuring that the material temperature is lower than 45°C, pulverize to 80-mesh solid powder, rinse or infiltrate the three solid powders with 100ml of 0.5% sodium oleate aqueous solution for 30 minutes, Filter and dry again to obtain three different solid acid powders. The obtained 3 parts of solid powder were all weighed i...

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Abstract

The invention relates to a solid acid for acid fracturing capacity increasing revamping and a preparation method for the solid acid. The solid acid is in form of inert water-insoluble solid powder or particles under a normal temperature condition, and comprises the following components in parts by weight: 10 to 85 parts of compound capable of generating a strong acid, 10 to 85 parts of water-insoluble compound which can be hydrolyzed into an organic acid, and 0.1 to 10 parts of fluxing agent. A water dispersion system of the solid acid can be slowly dissolved within four hours under the temperature condition of over 100 DEG C, and generates enough acids, so that an acid release rate under a high temperature condition can be effectively controlled, and the technical requirements of the deep acid fracturing revamping of a high-temperature carbonate reservoir can be completely met.

Description

technical field [0001] The invention relates to the technical field of oil exploration and development reservoir stimulation and transformation construction, in particular to an acid fracturing treatment agent, which is a solid acid used for acid fracturing stimulation and transformation. Background technique [0002] Acid fracturing is an important stimulation measure for carbonate reservoirs. In the conventional acid fracturing technology, the reaction speed of acid rock is relatively fast, and the acid fluid loss is serious, resulting in a small effective acid-etched fracture length, which restricts the effect of acid fracturing. It can be seen that increasing the effective action distance of acid liquid is one of the important ways to improve the effect of acid fracturing. Especially for high-temperature oil and gas reservoirs, how to reduce fluid loss and how to effectively delay the acid-rock reaction rate are the key points for realizing deep acid fracturing in carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72
Inventor 张福祥张国钰袁学芳杨向同刘举冯觉勇周然刘会锋
Owner PETROCHINA CO LTD
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