Cationic polymer densifier, fracturing fluid and preparation method thereof

A cationic polymer and anionic associative agent technology, applied in the field of oil drilling, can solve the problems of high pump injection friction, large amount of residue, unfavorable deep well construction, etc.

Active Publication Date: 2014-12-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, guar gum series fracturing fluid still has many defects: it contains a lot of water-insoluble substances, coupled with incomplete gel breaking and gel breaking residue, which greatly reduces the formation permeability and causes great damage to the formation; Chemical cross-linking, fast and irreversible cross-linking, resulting in high friction during pumping, which is not conducive to deep well fracturing; gel-breaking residue and formation damage make flowback effect poor, etc.
[0008] (1) The fracturing fluid has incomplete gel breaking and a large amount of residue, which causes great damage to the formation;
[0009] (2) The chemical cross-linking speed is fast and irreversible, resulting in high pump injection friction, which is not conducive to deep well construction;
[0010] (3) Clean fracturing fluid generally has poor temperature resistance;
[0011] (4) The cost is high, resulting in limited use

Method used

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  • Cationic polymer densifier, fracturing fluid and preparation method thereof
  • Cationic polymer densifier, fracturing fluid and preparation method thereof
  • Cationic polymer densifier, fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Use an appropriate amount of deionized water to dissolve AM, 10% DMDAAC, 4% urea and 4% sodium bicarbonate in sequence with a mass fraction of 30%;

[0037] 2) Add 0.05% of the mixture of sodium bisulfite and ammonium persulfate and 0.04% of 2,2'-azobisisobutylamidine dihydrochloride, accounting for the total mass of AM and DMDAAC, at 40°C under the condition of nitrogen protection , reacted for 20 minutes, and when the temperature of the system rose to 90°C, continued to react for 1.5 hours to obtain a solid polymer;

[0038] 3) Cut the polymer product into 1cm 3 The left and right cubes are stirred in kerosene containing 2wt% Span-80 to make it further broken;

[0039] 4) Dry the pulverized product at 70° C., and then pulverize it into a 60-mesh powder.

Embodiment 2

[0041] 1) Dissolve AM, 12% DMDAAC, 5% urea and 5% sodium bicarbonate in sequence with an appropriate amount of deionized water;

[0042] 2) Add 0.05% of the mixture of sodium bisulfite and ammonium persulfate and 0.04% of 2,2'-azobisisobutylamidine dihydrochloride, accounting for the total mass of AM and DMDAAC, at 45°C under the condition of nitrogen protection , reacted for 20 minutes, and when the temperature of the system rose to 96°C, continued the reaction for 1 hour to obtain a solid polymer;

[0043] 3) Cut the polymer product into 1cm 3The left and right cubes are stirred in kerosene containing 2wt% Span-80 to make it further broken;

[0044] 4) Dry the pulverized product at 70° C., and then pulverize it into a 60-mesh powder.

Embodiment 3

[0046] 1) Use an appropriate amount of deionized water to dissolve AM, 11% DMDAAC, 4.5% urea and 4.5% sodium bicarbonate in sequence with a mass fraction of 33%;

[0047] 2) Add 0.055% of the mixture of sodium bisulfite and ammonium persulfate and 0.045% of 2,2'-azobisisobutylamidine dihydrochloride, accounting for the total mass of AM and DMDAAC, under nitrogen protection conditions at 43°C , reacted for 20 minutes, and when the temperature of the system rose to 93°C, continued the reaction for 1 hour to obtain a solid polymer;

[0048] 2. the preparation of fracturing fluid (in the following each embodiment, described polymer thickener is all obtained by embodiment 1):

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Abstract

The invention discloses a cationic polymer densifier, a fracturing fluid and preparation methods of the cationic polymer densifier and the fracturing fluid. The cationic polymer densifier is prepared from the following components in percentage by weight: 30-35% of acrylamide monomer, 10-12% of dimethyl diallyl ammonium chloride monomer, 4-5% of anti-crosslinking agent, 4-5% of solubilizer, as well as redox initiator, 2, 2'-azo diisobutyl amidine dihydrochloride and the balance of water, wherein the redox initiator accounts for 0.05-0.06% of the total weight of the two monomers and 2,2'-azo diisobutyl amidine dihydrochloride accounts for 0.04-0.05% of the total weight of the two monomers. The fracturing fluid is prepared from the following components in percentage by weight: 0.8-1.0% of cationic polymer densifier, 0.3-0.4% of anionic association agent, 1.0-1.5% of antiswelling agent, 0.03-0.05% of gel breaker and the balance of water. The invention further discloses the preparation methods of the densifier and the fracturing fluid. The fracturing fluid disclosed by the invention has the characteristics of strong high-temperature resistance and anti-shear ability, low friction and less harm.

Description

Technical field: [0001] The invention relates to the field of petroleum drilling, in particular to a cationic polymer thickener, fracturing fluid and a preparation method thereof. Background technique: [0002] At present, most of the fracturing fluids used at home and abroad are water-based fracturing fluids, which can be basically divided into three types: natural vegetable gum fracturing fluids; viscoelastic surfactant (VES) cleaning fracturing fluids; synthetic polymeric fracturing fluids. fracturing fluid. [0003] Guar gum series fracturing fluids are representative of vegetable gum fracturing fluids, which are widely used and have good results due to their excellent performance in high temperature resistance and viscoelasticity. Nevertheless, guar gum series fracturing fluid still has many defects: it contains a lot of water-insoluble substances, coupled with incomplete gel breaking and gel breaking residue, which greatly reduces the formation permeability and causes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F226/02C08F4/40C08F4/04C09K8/68
Inventor 王中泽曾昊徐克彬王航周涛提云徐昊洋
Owner BC P INC CHINA NAT PETROLEUM CORP
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