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Sustained-release gel-breaking type fracturing propping agent and preparation method thereof
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A fracturing proppant and proppant technology, used in earth-moving drilling, fluid production, wellbore/well components, etc., to achieve the effects of ensuring stability, reducing breakage and high strength
Active Publication Date: 2014-07-02
CHINA NAT OFFSHORE OIL CORP +2
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Description
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Problems solved by technology
[0009] At present, there are no related reports on slow-release gel-breaking fracturing proppants that can slow-release gel-breaking and reduce proppant breakage.
Method used
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Embodiment 1
[0051] A preparation of drug-loaded intermediates
[0052] (1) After taking by weighing 50g ammonium persulfate and 150g silicon dioxide powder pulverization and mixing, it is subsequent use;
[0053] (2) Take 25g of acrylic resin and dissolve it in 500mL of ethanol to make 5% acrylic resin ethanol solution for subsequent use;
[0054] (3) Weigh 1 kg of 20-40 mesh ceramsite and place it on the turntable of the granulator;
[0055] (4) Turn on the granulator, adjust the rotary speed of the turntable to 100rpm, and the blast frequency to 10HZ;
[0056] (5) Sprinkle powder (mixed powder of ammonium persulfate and silicon dioxide) while spraying liquid (acrylic resin ethanol solution) (use a powder spreader to evenly sprinkle powder);
[0057] (6) The coated sample is passed through a 40-mesh sieve, and the uncoated fine powder is sieved;
[0058] (7) Dry the final sample in an oven at 35° C. for 0.8 h to obtain a drug-loaded intermediate.
[0059] The coating rate of the drug...
Embodiment 2
[0070] Preparation of drug-loaded intermediates
[0071] (1) After taking by weighing 60g ammonium persulfate and 240g silicon dioxide powder pulverization and mixing, it is subsequent use;
[0072] (2) Take 25g of acrylic resin and dissolve it in 500mL of ethanol to make 5% acrylic resin ethanol solution for subsequent use;
[0073] (3) Weigh 1 kg of 20-40 mesh ceramsite and place it on the turntable of the granulator;
[0074] (4) Turn on the granulator, adjust the rotary speed of the turntable to 100rpm, and the blast frequency to 10HZ;
[0075] (5) Sprinkle powder (mixed powder of ammonium persulfate and silicon dioxide) while spraying liquid (acrylic resin ethanol solution) (use a powder spreader to evenly sprinkle powder);
[0076] (6) The coated sample is passed through a 40-mesh sieve, and the uncoated fine powder is sieved;
[0077] (7) Dry the final sample in an oven at 35° C. for 0.8 h to obtain a drug-loaded intermediate.
[0078] The coating rate of the drug-l...
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Abstract
The invention discloses a sustained-release gel-breaking type fracturing propping agent for fracturing an oilfield. The propping agent sequentially comprises a base material, a medicament carrying layer and a sustained release layer from inside to outside, wherein the medicament carrying layer comprises a gel breaking agent and a filling agent, and the sustained release layer comprises a film forming material and a pore forming agent. The invention further provides a preparation method of the sustained-release gel-breaking type fracturing propping agent. In an actual application, the sustained-release gel-breaking type fracturing propping agent disclosed by the invention can enter the stratum along with fracturing fluid, and the gel breaking agent can be released slowly under the stratum conditions; and as the propping dosage is great, the gel breaking agent is distributed uniformly, and gel breaking can be realized to the greatest extent. Simultaneously, a chemical material coating the gel breaking agent can be stilly firmly coated on matrix particles, thus the problems of breaking, reflux and stratum embedding of the propping agent can be reduced.
Description
technical field [0001] The invention relates to a slow-release gel-breaking type fracturing proppant for oil field fracturing and a preparation method thereof. Background technique [0002] The gel breakers (persulfates, enzymes, capsule gel breakers, slow-release acids, etc.) currently used in the fracturing fluid system cannot completely break the gel evenly due to factors such as the amount of addition and the order of addition, leaving dead angles and stagnation. Part of the residual glue and filter cake lead to a decrease in fracture conductivity; moreover, ordinary proppants are easily broken, reflowed and embedded in formations under high closure pressure, resulting in a decrease in fracture conductivity and affecting fracturing effects. [0003] Chinese patent CN1984769A discloses a hydraulic fracturing proppant for oil and gas wells with a surface modified to improve wettability, change chemical reactivity, change surface topography, impart lubricity or control the ...
Claims
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Application Information
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