Self-heating gas generation foam fracturing fluid and preparation method thereof

A technology of foam fracturing fluid and self-generating heat, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of incomplete gel breaking, high cost, and difficult gel breaking, and achieve good sand-carrying performance and low damage, low-cost effect

CN111944511AInactive Publication Date: 2020-11-17SOUTHWEST PETROLEUM UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-11-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a self-heating gas generation foam fracturing fluid and a preparation method thereof. The fracturing fluid is prepared from the following raw materials in percentage by mass: 0.2%-0.5% of a thickening agent, 0.2%-0.5% of a cross-linking agent, 6%-8% of sodium nitrite, 6%-8% of ammonium chloride, 0.7%-1% of a heating catalyst, 0.1%-0.3% of a breaking aid, 0.1%-0.3% of a gelbreaker, and the balance of water. The thickening agent is acid-resistant modified guanidine gum. The fracturing fluid has good gel breaking performance, can automatically generate heat, generate gasand increase pressure, is foamed on site, greatly reduces requirements for ground equipment, has plugging and profile control effects higher than those of conventional foam, has low filtration loss and good sand carrying performance, achieves gel breaking through the low-temperature gel breaker, can promote flowback of the gel breaking fluid, and has good application prospects. The fracturing fluid is suitable for fracturing transformation of middle-shallow-layer high-condensation-point oil, thick crude oil and low-temperature low-pressure low-permeability oil and gas reservoirs.
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Description

technical field

[0001] The invention relates to the technical field of oil reservoir stimulation and transformation, in particular to a self-generating heat and gas foam fracturing fluid and a preparation method thereof. Background technique

[0002] High pouring oil has the characteristics of high freezing point (the freezing point is generally 40°C-67°C, up to 69°C), high wax content (wax content is generally 30%-35%, up to 45%), etc. During conventional hydraulic fracturing operations, the cold fluid injected into the formation will cool the crude oil around the bottom of the well, causing the viscosity of the crude oil to increase, and the crude oil to precipitate wax or solidify, thereby blocking part of the flow channel. The paraffin, colloid, and When the ambient temperature drops, asphalt will precipitate and lead to organic plugging, which will cause "cold damage" to the reservoir, thus reducing the conductivity of the fracturing fracture. Therefore, how to solve t...

Examples

Embodiment 1

[0027] A self-generating heat and gas foam fracturing fluid, including 0.3% acid-resistant modified guar gum, 0.2% organic zirconium, 6.8% sodium nitrite, 7% ammonium chloride, 0.9% industrial hydrochloric acid, 0.1% sodium sulfite, 0.1% ammonium persulfate, the balance is water. The acid-resistant modified guar gum is prepared through the following steps: using halogenated fatty acid as the main etherification agent, alkane epoxy compound as the secondary etherification agent, ethanol or isopropanol as the dispersant, and carrying out under alkaline conditions The etherification reaction introduces sodium carboxymethyl and hydroxypropyl groups into the molecular structure of the guar gum, and finally synthesizes the acid-resistant modified guar gum.

[0028] The above-mentioned fracturing fluid is prepared through the following steps: the fracturing fluid is divided into base fluid and cross-linking fluid, and configured separately; the configuration of the base fluid is to d...

Embodiment 2

[0030] The difference from Example 1 is that the formula of the fracturing fluid in this example is: 0.4% acid-resistant modified guar gum, 0.3% organic zirconium, 4.5% sodium nitrite, 5% ammonium chloride, 1.5% amino Sulfonic acid, 0.1% sodium sulfite, 0.3% ammonium persulfate, and the balance is water.

Embodiment 3

[0032] The difference from Example 1 is that the formula of the fracturing fluid in this example is: 0.3% acid-resistant modified guar gum, 0.3% organic zirconium, 6% sodium nitrite, 6.3% ammonium chloride, 1.2% industrial Hydrochloric acid, 0.1% sodium sulfite, 0.2% ammonium persulfate, and the balance is water.