A kind of acidification method of recoverable instant thickening acid

Abstract

The invention relates to an acidification method of recoverable quick-dissolving viscous acid. The method comprises the following steps of: uniformly mixing thickening agents, potassium chlorides and a hydrochloric acid solution on the ground; then pumping and injecting the mixture into the formation for acidification; closing a well for 30 minutes for controlling blow off after the acidification completion; entering flow-back fluid subjected to gas-liquid separation into an acid tank and performing still standing for 2 hours for delamination; respectively collecting a residual acid solution and the thickening agents; performing detection; if the design requirement is not reached, adding a certain amount of hydrochloric acid and thickening agents until the concentration of the acid solution conforms to the requirement; then, adding a certain number of potassium chlorides to reach the design requirement; performing the acidification construction again; repeating the steps; and completing the liquid repeated utilization. The acidification method has the advantages that the acid liquid filtration loss is reduced; the pollution on the formation is reduced; the flow-back fluid is directly recovered to the acid tank, so that the earth surface pollution is reduced; the flow-back fluid is recovered, so that the consumption of the thickening agents, water and the hydrochloric acid is reduced; after the flow-back fluid is treated on the ground, the flow-back fluid can be reused after the supplementary addition of a small number of the thickening agents, the hydrochloric acid and the potassium chloride; the construction operation cost is reduced; and the multi-time repeated utilization can be realized.

Description

technical field

[0001] The invention relates to an acidification method of recyclable instant thickened acid, which is mainly used for recyclable and reused acidification fluid of gas well carbonate rock reservoir to increase production and transformation. Background technique

[0002] Thickened acid is the main acid system for acid fracturing of paleo-carbonate reservoirs in the Changqing gas field. It has high viscosity, good slowing speed and fracture-making performance, long acid etching distance and good stimulation effect. However, the thickened acid currently used in the Changqing gas field has problems such as that the residual acid solution cannot be recycled after acidification, and the thickening time of the solution is long.

[0003] Since Schlumberger Dowell launched clean fracturing fluid based on viscoelastic surfactants in 1997, viscoelastic surfactant technology has been widely used and promoted in oil and gas field stimulation measures. Domestic reports on...

Examples

Embodiment 1

[0034] The present embodiment provides a kind of acidification method of recyclable instant thickened acid, comprising the steps of:

[0035] a. Pump the thickener, potassium chloride and hydrochloric acid solution together into the sand mixer and mix directly to form recyclable instant thickened acid;

[0036] The recyclable instant thickening acid is prepared from the following components according to the following mass component ratios:

[0037] Thickener: 1.5 parts;

[0038] Potassium chloride: 0.5 parts;

[0039] Hydrochloric acid solution: 100 parts.

[0040] The above thickener is a mixture of 55% N-lauroyl-N'-hydroxyethyl-N'-carboxypropyl ethylenediamine propionate or its derivatives, 8% ethanol and 37% water by mass ratio .

[0041] The mass concentration of the above-mentioned hydrochloric acid solution is 15%.

[0042] b. At a temperature of 90°C, acidify the recyclable instant-dissolved thickened acid-fractured intake well formation mixed in step a;

[0043] ...

Embodiment 2

[0052] The present embodiment provides a kind of acidification method of recyclable instant thickened acid, comprising the steps of:

[0053] a. Pump the thickener, potassium chloride and hydrochloric acid solution together into the sand mixer and mix directly to form recyclable instant thickened acid;

[0054] The recyclable instant thickening acid is prepared from the following components according to the following mass component ratios:

[0055] Thickener: 2 parts;

[0056] Potassium chloride: 1 part;

[0057] Hydrochloric acid solution: 100 parts.

[0058] The thickener is a mixture of 48% N-lauroyl-N'-hydroxyethyl-N'-carboxypropyl ethylenediamine propionate or its derivatives, 10% ethanol and 42% water by mass ratio.

[0059] The mass concentration of hydrochloric acid solution is 20%.

[0060] b. At a temperature of 90°C, acidify the recyclable instant-dissolved thickened acid-fractured intake well formation mixed in step a;

[0061] c. Shut down the well for 30 min...

Embodiment 3

[0071] The present embodiment provides a kind of acidification method of recyclable instant thickened acid, comprising the steps of:

[0072] a. Pump the thickener, potassium chloride and hydrochloric acid solution together into the sand mixer and mix directly to form recyclable instant thickened acid;

[0073] The recyclable instant thickening acid is prepared from the following components according to the following mass component ratios:

[0074] Thickener: 2.5 parts;

[0075] Potassium chloride: 2 parts;

[0076] Hydrochloric acid solution: 100 parts.

[0077] The thickener is a mixture of 63% N-lauroyl-N'-hydroxyethyl-N'-carboxypropyl ethylenediamine propionate or its derivatives, 6% ethanol and 31% water by mass ratio.

[0078] The mass concentration of hydrochloric acid solution is 25%.

[0079] b. At a temperature of 100°C, perform acidizing construction on the recyclable instant thickened acid fracturing inlet well formation mixed in step a;

[0080] c. Shut down ...

technical field

[0001] The invention relates to an acidification method of recyclable instant thickened acid, which is mainly used for recyclable and reused acidification fluid of gas well carbonate rock reservoir to increase production and transformation. Background technique

[0002] Thickened acid is the main acid system for acid fracturing of paleo-carbonate reservoirs in the Changqing gas field. It has high viscosity, good slowing speed and fracture-making performance, long acid etching distance and good stimulation effect. However, the thickened acid currently used in the Changqing gas field has problems such as that the residual acid solution cannot be recycled after acidification, and the thickening time of the solution is long.

[0003] Since Schlumberger Dowell launched clean fracturing fluid based on viscoelastic surfactants in 1997, viscoelastic surfactant technology has been widely used and promoted in oil and gas field stimulation measures. Domestic reports on...

Examples

Embodiment 1

[0034] The present embodiment provides a kind of acidification method of recyclable instant thickened acid, comprising the steps of:

[0035] a. Pump the thickener, potassium chloride and hydrochloric acid solution together into the sand mixer and mix directly to form recyclable instant thickened acid;

[0036] The recyclable instant thickening acid is prepared from the following components according to the following mass component ratios:

[0037] Thickener: 1.5 parts;

[0038] Potassium chloride: 0.5 parts;

[0039] Hydrochloric acid solution: 100 parts.

[0040] The above thickener is a mixture of 55% N-lauroyl-N'-hydroxyethyl-N'-carboxypropyl ethylenediamine propionate or its derivatives, 8% ethanol and 37% water by mass ratio .

[0041] The mass concentration of the above-mentioned hydrochloric acid solution is 15%.

[0042] b. At a temperature of 90°C, acidify the recyclable instant-dissolved thickened acid-fractured intake well formation mixed in step a;

[0043] ...

Embodiment 2

[0052] The present embodiment provides a kind of acidification method of recyclable instant thickened acid, comprising the steps of:

[0053] a. Pump the thickener, potassium chloride and hydrochloric acid solution together into the sand mixer and mix directly to form recyclable instant thickened acid;

[0054] The recyclable instant thickening acid is prepared from the following components according to the following mass component ratios:

[0055] Thickener: 2 parts;

[0056] Potassium chloride: 1 part;

[0057] Hydrochloric acid solution: 100 parts.

[0058] The thickener is a mixture of 48% N-lauroyl-N'-hydroxyethyl-N'-carboxypropyl ethylenediamine propionate or its derivatives, 10% ethanol and 42% water by mass ratio.

[0059] The mass concentration of hydrochloric acid solution is 20%.

[0060] b. At a temperature of 90°C, acidify the recyclable instant-dissolved thickened acid-fractured intake well formation mixed in step a;

[0061] c. Shut down the well for 30 min...

Embodiment 3

[0071] The present embodiment provides a kind of acidification method of recyclable instant thickened acid, comprising the steps of:

[0072] a. Pump the thickener, potassium chloride and hydrochloric acid solution together into the sand mixer and mix directly to form recyclable instant thickened acid;

[0073] The recyclable instant thickening acid is prepared from the following components according to the following mass component ratios:

[0074] Thickener: 2.5 parts;

[0075] Potassium chloride: 2 parts;

[0076] Hydrochloric acid solution: 100 parts.

[0077] The thickener is a mixture of 63% N-lauroyl-N'-hydroxyethyl-N'-carboxypropyl ethylenediamine propionate or its derivatives, 6% ethanol and 31% water by mass ratio.

[0078] The mass concentration of hydrochloric acid solution is 25%.

[0079] b. At a temperature of 100°C, perform acidizing construction on the recyclable instant thickened acid fracturing inlet well formation mixed in step a;

[0080] c. Shut down ...

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