Fluoroboric acid blocking remover and acidification de-blocking method

A technology of fluoroboric acid and blocking agent, applied in the field of oil and gas exploration, can solve problems such as the inability to effectively deal with the water lock effect of pore blockage, and achieve the effects of releasing the water lock effect, high corrosion rate, and slowing corrosion.

Active Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plugging remover slowly generates HF in the reservoir through hydrazine hydrochloride and fluorine-containing compounds, and has certain improvements in penetration depth and control of acid-rock reaction; however, the plugging remover still cannot effectively deal with pore blockage caused by fracturing fluid emulsification and the water lock effect caused by the long-term contact between the fracturing fluid and the bottom layer

Method used

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  • Fluoroboric acid blocking remover and acidification de-blocking method
  • Fluoroboric acid blocking remover and acidification de-blocking method
  • Fluoroboric acid blocking remover and acidification de-blocking method

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Embodiment 1

[0040] The fluoboric acid plugging remover for decontaminating oil and gas reservoirs in this embodiment consists of pre-acid, main acid and post-acid; the pre-acid and post-acid are the same, and are composed of the following components in mass percentage: hydrochloric acid 10%, 0.8% clay stabilizer, 0.25% iron ion stabilizer, 0.25% corrosion inhibitor, 0.4% hydrolytic locking agent, 0.2% mutual solvent, and the balance is water;

[0041] The main acid is composed of the following components in mass percentage: 6% acetic acid, 2% fluoboric acid, 0.8% clay stabilizer, 0.25% iron ion stabilizer, 0.25% corrosion inhibitor, 0.4% hydrolytic lock agent, 0.2% mutual solvent, The balance is water.

[0042] The clay stabilizer is ammonium chloride, the iron ion stabilizer is citric acid, the corrosion inhibitor is SJ-21 normal temperature acidification corrosion inhibitor, the water lock agent is AS-3 water lock damage treatment agent, and the mutual solvent is ethylene glycol butyl ...

Embodiment 2

[0045] The fluoboric acid plugging remover for decontaminating oil and gas reservoirs in this embodiment consists of pre-acid, main acid and post-acid; the pre-acid and post-acid are the same, and are composed of the following components in mass percentage: hydrochloric acid 10%, 1% clay stabilizer, 0.6% iron ion stabilizer, 0.5% corrosion inhibitor, 0.6% hydrolytic lock agent, 0.8% mutual solvent, and the balance is water;

[0046] The main acid is composed of the following components in mass percentage: 6% acetic acid, 2% fluoboric acid, 1% clay stabilizer, 0.6% iron ion stabilizer, 0.5% corrosion inhibitor, 0.6% hydrolytic lock agent, 0.8% mutual solvent, The balance is water; the clay stabilizer is ammonium chloride, the iron ion stabilizer is citric acid, the corrosion inhibitor is SJ-21 normal temperature acidification corrosion inhibitor, and the dehydration lock agent is AS-3 water lock damage treatment agent, mutual solvent For ethylene glycol butyl ether.

[0047] T...

Embodiment 3

[0049] The fluoboric acid plugging agent of this embodiment is composed of a pre-acid, a main acid and a post-acid; the pre-acid and post-acid are the same and are composed of the following components in mass percentages: hydrochloric acid 10%, clay stabilizer 1% , 0.5% of iron ion stabilizer, 0.5% of corrosion inhibitor, 0.5% of hydrolytic lock agent, 0.5% of mutual solvent, and the balance is water;

[0050] The main acid is composed of the following components in mass percentage: 6% acetic acid, 2% fluoboric acid, 1% clay stabilizer, 0.5% iron ion stabilizer, 0.5% corrosion inhibitor, 0.5% hydrolytic lock agent, 0.5% mutual solvent, The balance is water; the clay stabilizer is ammonium chloride, the iron ion stabilizer is citric acid, the corrosion inhibitor is SJ-21 normal temperature acidification corrosion inhibitor, and the dehydration lock agent is AS-3 water lock damage treatment agent, mutual solvent For ethylene glycol butyl ether.

[0051] The acidification pluggi...

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Abstract

The invention discloses a fluoroboric acid blocking remover and an acidification de-blocking method. The blocking remover is composed of prepad acid, subject acid and afterpad acid. The prepad acid and the afterpad acid are prepared from the same constituents which include, by mass, 10% of hydrochloric acid, 0.8-1.5% of clay stabilizer, 0.2-1.0% of ferrous stabilizer, 0.25-1.0% of corrosion inhibitor, 0.4-1.0% of water block removal agent, 0.2-1.0% of mutual solvent and the balance water. The subject acid is prepared from, by mass, 6% of acetic acid, 2% of fluoroboric acid, 0.8-1.5% of clay stabilizer, 0.2-1.0% of ferrous stabilizer, 0.25-1.0% of corrosion inhibitor, 0.4-1.0% of water block removal agent, 0.2-1.0% of mutual solvent and the balance water. By the adoption of the fluoroboric acid blocking remover, de-blocking of a low-yield unconventional tight sandstone oil and gas reservoir caused by water blocking reaction, inorganic scale and inflow fluid emulsification can be achieved effectively.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, and in particular relates to a fluoroboric acid plugging removal agent and an acidification plugging removal method. Background technique [0002] Tight sandstone reservoirs in the Ordos Basin usually have the characteristics of low porosity, low permeability, low reserve abundance, and low natural productivity. Horizontal well drilling and hydraulic fracturing are often used to increase production of oil and gas wells. Due to the poor porosity and permeability conditions of the reservoir, the working fluid entering the ground during drilling and fracturing can easily cause certain pollution to the reservoir and affect the production of a single well. [0003] Acidizing plugging removal is a commonly used method of increasing production in oilfield production. Acidizing plugging removal is to use the corrosive acid of acid to etch the mineral particles that block the oil flow chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528C09K8/74E21B37/06E21B43/27
CPCC09K8/528C09K8/74E21B37/06E21B43/26
Inventor 李嘉瑞董光李克智秦玉英何青陈付虎张永春梅洁李国锋王帆徐兵威蒋艳芳申贝贝李雷刘威
Owner CHINA PETROLEUM & CHEM CORP
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