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Gelled-acid acid liquor applicable to high-temperature carbonatite acidification

A technology of gelled acid liquid and carbonate rock, which is applied in the direction of drilling compositions, chemical instruments and methods, and can solve the problems of limited field use, high cost, and unstable performance of the gelled acid liquid system. , to achieve the effect of reducing secondary damage, stable performance and convenient construction

Inactive Publication Date: 2014-07-16
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of the prepared gelled acid system is not stable enough and the cost is high, which limits the field use to a certain extent.

Method used

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  • Gelled-acid acid liquor applicable to high-temperature carbonatite acidification
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  • Gelled-acid acid liquor applicable to high-temperature carbonatite acidification

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] 64mL mass percentage concentration (the same below) 31% HCl+0.6g gelling agent (China Petroleum Bohai Drilling Engineering Company Engineering Technology Research Institute / BZ gelling agent for acidification)+4mL corrosion inhibitor (China Petroleum Bohai Drilling Engineering Company engineering technology Research Institute / corrosion inhibitor for BZ acidification)+2mL drainage aid (Engineering Technology Research Institute of PetroChina Bohai Drilling Engineering Company / drainage aid for BZ measures)+2mL iron ion stabilizer (engineering technology research of PetroChina Bohai Drilling Engineering Company Hospital / BZ iron ion stabilizer for acidification) + 28mL water.

[0022] The acid dissolution time of the gelling agent is 20min, the viscosity of the gelling acid solution system at room temperature is 40mpa s, and at 150°C, 170s -1 After 60 minutes of shearing, the viscosity of the acid solution is 15mpa·s, which meets the requirements of on-site construction. Exa...

example 2

[0023] 64mL31%HCl+0.65g gelling agent (China Petroleum Bohai Drilling Engineering Company Engineering Technology Research Institute / BZ acidification gelling agent)+4mL corrosion inhibitor (China Petroleum Bohai Drilling Engineering Company Engineering Technology Research Institute / BZ acidification corrosion inhibition agent)+2mL drainage aid (PetroChina Bohai Drilling Engineering Company Engineering Technology Research Institute / drainage aid for BZ measures)+2mL iron ion stabilizer (PetroChina Bohai Drilling Engineering Company Engineering Technology Research Institute / BZ iron ion stabilization for acidification) agent)+28mL water.

[0024] The acid dissolution time of the gelling agent is 22min, the viscosity of the gelling acid solution system at room temperature is 42mpa·s, and at 150°C, 170s -1 After 60 minutes of lower shearing, the viscosity of the acid solution is 16mpa·s, which meets the requirements of on-site construction. Example 3

example 3

[0025] 64mL31%HCl+0.8g gelling agent (China Petroleum Bohai Drilling Engineering Company Engineering Technology Research Institute / BZ acidification gelling agent)+4mL corrosion inhibitor (China Petroleum Bohai Drilling Engineering Company Engineering Technology Research Institute / BZ acidification corrosion inhibition agent)+2mL drainage aid (PetroChina Bohai Drilling Engineering Company Engineering Technology Research Institute / drainage aid for BZ measures)+2mL iron ion stabilizer (PetroChina Bohai Drilling Engineering Company Engineering Technology Research Institute / BZ iron ion stabilization for acidification) agent)+28mL water.

[0026] The acid dissolution time of the gelling agent is 23min, the viscosity of the gelling acid solution system at room temperature is 45mpa s, and at 150°C, 170s -1 After 60 minutes of shearing, the viscosity of the acid solution is 18mpa·s, which meets the requirements of on-site construction.

[0027] The above-mentioned reagents produced by ...

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Abstract

The invention discloses gelled-acid acid liquor applicable to high-temperature carbonatite acidification. The gelled-acid acid liquor comprises 0.6%-0.8% by mass volume of gelling agent, 2%-4% by volume of corrosion inhibitor, 1%-2% by volume of discharge aiding agent, 1%-2% by volume of iron ion stabilizer, 15%-22% by volume of hydrochloric acid and the balance of water. The gelled-acid acid liquor disclosed by the invention can be applied to high-temperature carbonatite acidification construction, is high temperature-resistant and salt-resistant, has good retardance, de-filtration, perforating and resistance reducing performances, and can effectively relieve secondary damage to achieve a deep acidification process. The gelled-acid acid liquor system is stable in performance, simple to prepare, convenient to construct and capable of being effectively applied to high-temperature carbonatite acidification modification construction.

Description

technical field [0001] The invention relates to a gelled acid, in particular to a gelled acid solution suitable for high-temperature carbonate rock acidification, which can effectively improve the flow conductivity of acid-etched cracks and the penetration distance of acid. Background technique [0002] At present, the gelling acid used in the oil field has a small viscosity at high temperature, is not resistant to shearing, and has a large gap in the performance of reducing the reaction rate of the acid salt. With the continuous deepening of oilfield development technology, the number of deep wells and ultra-deep wells is gradually increasing, and the performance requirements of gelled acid are also getting higher and higher. It is necessary to achieve high temperature resistance and shear resistance, and no harmful residues or residues during flowback after the reaction. Very few, good stability effects. As an important part of acid fracturing technology, the performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K8/602C09K8/882C09K2208/32
Inventor 徐杏娟贾红战李军李文杰曹骕骕毕研霞王云云
Owner CNPC BOHAI DRILLING ENG
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