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Composite acid liquid system for weak heterogeneous reservoir acidification and preparation method of composite acid liquid system
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A heterogeneous, compound acid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as formation damage, and achieve the effects of avoiding waste, slowing acidification, and slowing down the time of water breakthrough
Inactive Publication Date: 2020-01-17
CHENGDU NORTH OIL EXPLORATION DEV TECH
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Problems solved by technology
[0004] The purpose of the present invention is to provide a compound acid system for acidizing weakly heterogeneous reservoirs and its preparation method to solve the problem of gelling acid systems in the prior art used for acidizing weakly heterogeneous reservoirs. , it is easy to cause obvious damage to the formation, to achieve the purpose of reducing the damage to the formation when the gel system is used in the reservoir with weak heterogeneity
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Embodiment 1
[0023] A compound acid solution system for acidizing weakly heterogeneous reservoirs, including the following components in mass percentage: 1% gelling agent, 0.4% thickening agent, 5% corrosion inhibitor, 1.5% drainage aid, iron 1% ion stabilizer, 4% blowing agent, 0.3% foam stabilizer, 1% calcium carbonate, 15% hydrochloric acid, and the balance is water.
[0024] Preferably, the gelling agent is a copolymer formed of methacryloxyethyltrimethylammonium chloride and acrylamide. The thickener is a copolymer formed of anionic monomer 2-acrylamide-2-methylpropanesulfonic acid and acrylamide. The corrosion inhibitor is Mannich base quaternary ammonium salt. The concentration of hydrochloric acid is 25%.
[0025] The preparation method of the compound acid liquid system in this embodiment is as follows: mix the components according to the mass percentage, and stir with a high-speed mixer at a speed of 1800 rpm to 2000 rpm until a milky white uniformly dispersed microfoam liquid ...
Embodiment 2
[0027] A compound acid system for acidizing weakly heterogeneous reservoirs, including the following components in mass percentage: 0.8% gelling agent, 0.4% thickening agent, 5% corrosion inhibitor, 1.5% drainage aid, iron 1% of ion stabilizer, 3% of foaming agent, 0.2% of foam stabilizer, 1% of calcium carbonate, 15% of hydrochloric acid, and the balance is water.
Embodiment 3
[0029]A compound acid solution system for acidizing weakly heterogeneous reservoirs, including the following components in mass percentage: 1.2% gelling agent, 0.3-0.5% thickening agent, 5% corrosion inhibitor, and 1.5% drainage aid , 1% iron ion stabilizer, 5% foaming agent, 0.2% foam stabilizer, 1% calcium carbonate, 15% hydrochloric acid, and the balance is water.
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Abstract
The invention discloses a composite acid liquid system for weak heterogeneous reservoir acidification and a preparation method of the composite acid liquid system. The composite acid liquid system comprises the following components in percentage by mass: 0.8%-1.2% of a gelatinizing agent, 0.3%-0.5% of a thickening agent, 4%-6% of a corrosion inhibitor, 1%-2% of a cleanup additive, 0.5%-2% of an iron ion stabilizer, 3%-5% of a foaming agent, 0.2%-0.3% of a foam stabilizer, 1%-1.5% of calcium carbonate, 10%-25% of hydrochloric acid and the balance of water. The composite acid liquid system for weak heterogeneous reservoir acidification and the preparation method of the composite acid liquid system are provided. The problem that in the prior art, when a gelled acid system is used for acidizing a reservoir with weak heterogeneity, a stratum is prone to being damaged obviously is solved, and the purpose of improving damage to the stratum when the reservoir with weak heterogeneity uses the gelled system is achieved.
Description
technical field [0001] The invention relates to the field of acidification production enhancement, in particular to a compound acid solution system for acidification of weakly heterogeneous reservoirs and a preparation method thereof. Background technique [0002] In the acidizing construction, due to the fast reaction speed of the acid rock and the short penetration distance of the acid, it can only eliminate the damage to the formation near the wellbore. Therefore, increasing the concentration of acid can appropriately increase the penetration distance of acid liquid. Generally, the effective period of increasing production by acidification is relatively short. After sandstone is acidified, the migration of clay particles or other particles may easily block the oil flow channels, resulting in a rapid increase in the initial production of acidification and a rapid decline in the later production. In carbonate reservoirs, because the acid fluid reacts with carbonate rock to...
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