Shale gas acid fracturing drag reducer and reparation method thereof

A technology of acid fracturing and drag reducer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of small molecular weight, poor acid resistance, and low content of polymers, and achieve safe and stable transportation and storage High resistance, the effect of improving the anti-acid ability

Inactive Publication Date: 2014-04-02
SOUTHWEST PETROLEUM UNIV
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AI Technical Summary

Problems solved by technology

The patent with the publication number CN102977877A reports a drag reducer for shale gas fracturing, which uses sodium acrylate, acrylamide and 2-acrylamido-2-methylpropanesulfonate as monomers, and adopts the method of dispersion polymerization prepared, but the content of 2-acrylamido-2-methylpropanesulfonate sodium in this kind of drag reducer is less, and its acid resistance is poor, so it is not suitable for shale gas acidification fracturing fluid
In addition, the molecular weight of the polymer obtained by dispersion polymerization is small, which also cannot meet the application requirements of shale gas acidification fracturing fluid

Method used

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  • Shale gas acid fracturing drag reducer and reparation method thereof

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Effect test

Embodiment 1

[0026] Example 1 Preparation of shale gas acidizing fracturing drag reducer

[0027] Mix monomer acrylic acid and 2-acrylamide-2 methyl propane sulfonic acid, dissolve in aqueous solution, adjust pH=7, add acrylamide to dissolve, acrylamide: acrylic acid: 2-acrylamide-2 methyl propane sulfonic acid The mass ratio is 3.8:0.5:1; then add disodium ethylenediaminetetraacetic acid to make the concentration 30mg / L; it is the water phase, and the mass fraction of water is 50%.

[0028] Mix and dissolve aviation kerosene and compounded surfactant at a mass ratio of 0.284:1, and add it to a 250mL three-necked flask equipped with a stirrer, wherein the surfactant Span-80 and Tween-80 are compounded at a mass ratio of 5.25:1 Formed, the HLB value is 6.0. Add the water phase into the three-necked flask, the mass ratio of the oil phase to the water phase is 0.595:1, stir and emulsify at 1000r / min for 30 minutes, then place the three-necked flask at a water temperature of 45°C, Nitrogen g...

Embodiment 2

[0029] Indoor measurement of embodiment 2 drag reducer acid resistance

[0030] (1) Dissolve the drag reducer in clear water to prepare drag reducer solutions with different concentrations;

[0031] (2) The power unit of the test is a screw pump to avoid the shear degradation of the molecular segment of the drag reducer by centrifugal pumps and gear pumps;

[0032] (3) Use a circular pipeline as the test pipe section, install pressure sensors at both ends of the test pipe section, adjust the flow rate of the screw pump, record the readings of the pressure sensors at both ends of the test pipe section under different flow rates, and calculate the water and drag reducer solution at The pressure drop △P generated by flowing through the test pipe section under different flow rates;

[0033] (4) The resistance reduction rate is calculated by the following formula

[0034]

[0035] In the formula: K—drag reduction rate, %

[0036] ΔP 水 ——The pressure drop produced when clean ...

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Abstract

The invention discloses a shale gas acid fracturing drag reducer and a reparation method of the shale gas acid fracturing drag reducer. The preparation method comprises the following steps: mixing monomer acrylic acid and 2-acrylamide-2 methyl propane sulfonic acid, dissolving in water, subsequently adding acrylamide, and finally adding ethylenediamine tetraacetic acid disodium to prepare into a water phase; mixing and dissolving a compounded surfactant with base oil to form an oil phase; performing inverse emulsion polymerization on the oil phase and the water phase to prepare the shale gas acid fracturing drag reducer. As a great amount of acid resistance monomers are introduced into the drag reducer, the acid resistance of the dreg reducer is greatly improved; the dreg reducer is milk white emulsion in appearance, is high in stability, non-ignitable, non-explosive, safe to transport and store, rapid to dissolve in water and free of fisheye; the requirements of continuous blending in shale gas acid fracturing can be met; the resistance reduction rate of a dreg reducer solution with the mass percentage of 0.2% can be greater than 70%.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a shale gas acidizing fracturing drag reducer and a preparation method thereof. Background technique [0002] The two key technologies for shale gas exploitation are horizontal well drilling and completion and hydraulic fracturing. The fracturing fluid system in hydraulic fracturing technology, especially the drag reducer that reduces fluid friction, is the top priority. In recent years, the drag-reducing water fracturing fluid systems used in shale gas wells in my country have all come from abroad, and there is no drag-reducing agent and fracturing fluid system with excellent performance in China. In addition, during the development of shale gas, with the use of acidified fracturing fluid, higher requirements are put forward for the synthesis of drag reducers, and the realization of acid resistance of drag reducers has become the focus of current research. The patent wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/64C08F220/06C08F220/58C08F220/56
CPCC08F220/56C09K8/725C09K8/74C09K2208/28C08F220/585C08F220/06
Inventor 方申文陈凯凤张博宁段明刘平礼王承杰
Owner SOUTHWEST PETROLEUM UNIV
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