Acid polymer weighted fracture fluid and preparation method thereof

An acid polymer, fracturing fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of indeterminate, alkali-sensitive formation damage, high molecular weight of guar gum thickener, and achieve good resistance Temperature and shear resistance, reduced wellhead construction pressure, and adjustable cross-linking time

CN105295885AInactive Publication Date: 2016-02-03CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-02-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses an acid polymer weighted fracture fluid and a preparation method thereof, wherein the acid polymer weighted fracture fluid comprises a base fluid and a crosslinked fluid, the base fluid comprises components with percentage by quality: weighting agents 20%-50%, polymer thickening agent 0.8%-1.20% and discharge aiding agent 0.2%-0.5%, and the allowance is water. The crosslinked fluid comprises an acid polymer delayed crosslinked agent and an acid polymer crosslinked agent, wherein the weight radio of the acid polymer delayed crosslinked agent and the acid polymer crosslinked agent is (1.5-2.5): (3.5-5), and the quality of the crosslinked fluid is 0.6%-0.8% of the quality of the base fluid. The acid polymer weighted fracture fluid achieves to adjust density in 1.10g / cm3-1.50g / cm3, meets the density demands for the scene, improves pressure of fluid columns in shafts, reduces construction pressure of wellheads, and is suitable to remould fracture reservoirs of deep wells, superdeep wells, abnormal high pressure wells and dense wells.
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Description

technical field

[0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to an acidic polymer weighted fracturing fluid and a preparation method thereof. Background technique

[0002] The fracturing fluid of the guar gum fracturing system currently used can better meet the needs of the fracturing process in low-permeability oilfields, but the guar gum system has a high residue content, and cross-linking in an alkaline environment can cause damage to alkali-sensitive reservoirs, etc. question. The polymer fracturing fluid system has the advantages of better viscosity-temperature characteristics, strong thickening ability, no residue, cross-linking under acidic conditions, and controllable cross-linking time.

[0003] In the prior art, the publication number CN104263346A "A kind of acid weighted fracturing fluid and its preparation method and application" discloses a fracturing fluid, which is composed of the following co...

Examples

Embodiment 1

[0057] The acidic polymer weighted fracturing fluid of this embodiment is composed of base fluid, crosslinking fluid and gel breaker;

[0058] The base liquid is composed of the following components by weight percentage: weighting agent 20%, polymer thickener 0.8%, drainage aid 0.2%, and the balance is water; the weighting agent is potassium chloride;

[0059] The cross-linking liquid is composed of an organoaluminum-zirconium delayed cross-linking agent and an organoaluminum-zirconium cross-linking agent, and the weight ratio of the organoaluminum-zirconium delayed cross-linking agent to the organoaluminum-zirconium cross-linking agent is 1.5:3.5; the cross-linking liquid The mass is 0.6% of the mass of the base fluid;

[0060] The gel breaker is a capsule gel breaker, and the mass of the gel breaker is 0.03% of the mass of the base liquid.

[0061] The acidic polymer weighted fracturing fluid preparation method of the present embodiment comprises the following steps:

[00...

Embodiment 2

[0067] The acidic polymer weighted fracturing fluid of this embodiment is composed of base fluid, crosslinking fluid and gel breaker;

[0068] The base liquid is composed of the following components by weight percentage: weighting agent 34%, polymer thickener 0.9%, drainage aid 0.2%, and the balance is water; the weighting agent is potassium chloride and potassium bromide A mixture with a mass ratio of 1:3;

[0069] The cross-linking liquid is composed of an organoaluminum-zirconium delayed cross-linking agent and an organoaluminum-zirconium cross-linking agent, and the weight ratio of the organoaluminum-zirconium delayed cross-linking agent to the organoaluminum-zirconium cross-linking agent is 1.5:4.0; the cross-linking liquid The mass is 0.6% of the mass of the base fluid;

[0070] The gel breaker is a capsule gel breaker, and the quality of the gel breaker is 0.02% of the mass of the base liquid.

[0071] The acidic polymer weighted fracturing fluid preparation method of...

Embodiment 3

[0077] The acidic polymer weighted fracturing fluid of this embodiment is composed of base fluid, crosslinking fluid and gel breaker;

[0078] The base liquid is composed of the following components by weight percentage: weighting agent 35%, polymer thickener 1.0%, drainage aid 0.2%, and the balance is water; the weighting agent is potassium bromide and sodium bromide A mixture with a mass ratio of 1:4;

[0079] The cross-linking liquid is composed of an organoaluminum-zirconium delayed cross-linking agent and an organoaluminum-zirconium cross-linking agent, and the weight ratio of the organoaluminum-zirconium delayed cross-linking agent to the organoaluminum-zirconium cross-linking agent is 2.0:4.5; the cross-linking liquid The mass is 0.7% of the mass of the base fluid;

[0080] The gel breaker is a capsule gel breaker, and the mass of the gel breaker is 0.03% of the mass of the base liquid.

[0081] The acidic polymer weighted fracturing fluid preparation method of the pr...