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Nitrogen foam fracturing fluid for coal bed methane and preparation method of nitrogen foam fracturing fluid

A nitrogen foam, fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of non-dispersion of pulverized coal, high friction, and achieve small liquid filtration, low filtration coefficient, The effect of good sand carrying and rheological properties

Active Publication Date: 2014-03-26
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The active water fracturing fluid has the defects of high friction resistance and no dispersing effect on the coal powder produced during fracturing construction.

Method used

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  • Nitrogen foam fracturing fluid for coal bed methane and preparation method of nitrogen foam fracturing fluid
  • Nitrogen foam fracturing fluid for coal bed methane and preparation method of nitrogen foam fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A coal bed gas nitrogen foam fracturing fluid, including gas phase and liquid phase, the gas phase is nitrogen, the liquid phase is an aqueous solution containing 0.45wt% foaming agent, 1.0wt% foam stabilizer, 0.20wt% gel breaker, gas phase and liquid phase The gas-liquid ratio of the phase is 3:1 volume ratio, which is produced by a foam generator; wherein: the foaming agent is made of sodium lauryl sulfate and N-(2-hydroxypropyl) perfluorooctylamide in a mass ratio of 8 : 1 composition system, the foam stabilizer is the viscoelastic surfactant cetyltrimethylammonium chloride, and the gel breaker is a redox system composed of ammonium persulfate and sodium sulfite in a mass ratio of 1:1.

[0028] Preparation method: The schematic diagram of the preparation process is as follows figure 1 shown.

[0029] Formulated with 0.05% N-(2-hydroxypropyl) perfluorooctylamide (FCS-1), 0.4% sodium dodecyl sulfate (SDS), 1.0% cetyltrimethylammonium chloride (VES- A), 0.1%NH 4 S 2...

Embodiment 2

[0032] Formulated with 0.02% N-(2-hydroxypropyl) perfluorooctylamide, 0.2% sodium lauryl sulfate, 0.4% cetyltrimethylammonium chloride, 0.15% NH 4 S 2 o 8 and 0.15%Na 2 SO 3 Put the foaming liquid aqueous solution into the medicine container, inject the foam generator at a speed of 5ml / min through the pump, at the same time, release the nitrogen gas from the nitrogen cylinder, and inject the nitrogen gas at a speed of 10ml / min by setting the flow rate of the gas mass flow meter Foam generator; inject foaming liquid and nitrogen into the foam generator at the same injection speed at the same time, control the volume ratio of nitrogen and liquid to 2:1, that is, the foam quality is 67%, and obtain nitrogen foam fracturing fluid through the foam generator .

[0033] Put the above nitrogen foam fracturing fluid at 30°C, 1.5MPa, 170s -1 Under shearing for 30 minutes, the viscosity of the system basically remained at 53mPa·s. After 2 hours of gel breaking, the viscosity of the...

Embodiment 3

[0035] Preparation containing 0.02% FCS-1, 0.2% SDS, 0.4% octadecyltrimethylammonium chloride, 0.15% NH 4 S 2 o 8 and 0.15%Na 2 SO 3 The foaming liquid (liquid phase aqueous solution) is put into the medicine container, and injected into the foam generator through the pump at a speed of 5ml / min; at the same time, the nitrogen gas is released from the nitrogen gas bottle, and the nitrogen gas is injected into the foam generator by setting the flow rate of the gas mass flowmeter. Inject the foam generator at a speed of 20ml / min; inject the foaming liquid and nitrogen into the foam generator at the same time at their respective injection speeds, and control the volume ratio of nitrogen and liquid to 4:1, that is, the foam quality is 80%, obtained through the foam generator Nitrogen foam fracturing fluid.

[0036] Put the above nitrogen foam fracturing fluid at 30°C, 1.5MPa, 170s -1 Under shearing for 30 minutes, the viscosity of the system basically remained at 90mPa·s. Aft...

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Abstract

The invention relates to a nitrogen foam fracturing fluid for coal bed methane and a preparation method of the nitrogen foam fracturing fluid. The nitrogen foam fracturing fluid comprises a gas phase and a fluid phase, the gas phase is nitrogen, the fluid phase is an aqueous solution which contains 0.20-0.50 wt.% of a foaming agent, 0.4-1.0 wt. % of a foam stabilizer and 0.10-0.30 wt.% of a gel breaker, the volume ratio of the gas phase to the fluid phase is (2-4):1, and corresponding foam mass is 65%-80%; and the foaming agent is a compound system which is composed of sodium dodecyl sulfate and N-(2-hydroxypropyl) perfluor caprylamide according to the mass ratio of (8-10):1, the foam stabilizer is C16-C20 lauryltrimethylammonium chloride, and the gel breaker is a redox system which is composed of ammonium persulfate and sodium sulfite according to the mass ratio of (1.0-2.0):1. A foam generator is used for obtaining the nitrogen foam fracturing fluid. The nitrogen foam fracturing fluid has the advantages of being simple in fluid preparing, small in harm to a coal bed, low in leak-off, small in friction, rapid in flowback speed, high in sand-carrying capability and the like.

Description

technical field [0001] The invention relates to a water-based nitrogen foam fracturing fluid for coalbed gas well fracturing and a preparation method thereof, belonging to the technical field of oil field chemistry. technical background [0002] Coal is an unconventional reservoir with low Young's modulus, high Poisson's ratio, low hardness, and is easily broken. It is composed of matrix and fractures. Coal bed gas is mainly adsorbed on the inner surface of the micropores of the coal bed matrix. , the fracture system is the main channel for coal seam fluid (gas and water) migration. The fracture system of coal seams is affected by many factors. Poor connectivity and low permeability are the fatal defects of coal reservoirs. Therefore, fracturing is needed to improve the conductivity of coal seams. Conventional vertical coalbed methane wells are difficult to obtain without fracturing. production capacity. [0003] Since the coalbed methane layer has the characteristics of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/70
Inventor 戴彩丽由庆赵明伟丁云宏刘欣梅赵光丁昊明王欣管保山刘萍梁利
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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