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Environment-friendly and bio-available green fracturing fluid system

An environmentally friendly, fracturing fluid technology, applied in the field of fracturing systems, can solve the problems of non-biological repair, harmful and toxic biomass, and difficult microbial biodegradation or reuse, so as to reduce equipment construction loss, save energy, and reduce construction costs. cost effect

Inactive Publication Date: 2010-09-22
DALIAN BITEOMICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the harmful and toxic biomass produced after chemical gel breaking cannot be biorestored, even if the flowback liquid that flows back to the ground has a high sugar content of biomass, it is not easy to be biodegraded or reused by microorganisms

Method used

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  • Environment-friendly and bio-available green fracturing fluid system
  • Environment-friendly and bio-available green fracturing fluid system
  • Environment-friendly and bio-available green fracturing fluid system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Rheology experiment: test the cross-linked jelly composed of the following formula:

[0040] Formula of fracturing system base fluid (based on cross-linking ratio of 100:5)

[0041] Additive Name Weight Amount (%)

[0042] Hydroxypropyl Guar Gum 0.30

[0043] Biological drainage aid (rhamnolipid) 0.025

[0044] Biological fungicide (surfactin) 0.002

[0045] Clay stabilizer (KCl) 1.00

[0046] Fracturing fluid optimizer (phosphate) 0.30

[0047] 1.0% crosslinking agent (borax aqueous solution) 4.80

[0048] In the above formula, the phosphate uses a self-made nitrogen and phosphorus source, and its composition is 1.60mol% KH 2 PO 4 , 0.70mol%K 2 HPO 4 , 0.32mol% (NH 4 ) 2 HPO 4 , the rest is water, and the pH is adjusted to 7-9.

[0049] Prepare the base liquid according to the formula, dilute the enzyme gel breaker (alkali-resistant and salt-resistant β-galactomannanase) 100 times with pure water, add a certain amount to the above-mentioned base liquid to ...

Embodiment 2

[0051] The enzyme gel breaking experiment used the base fluid prepared in Example 1, added 0.3% fracturing fluid optimizer, diluted the enzyme solution 100 times with pure water, so that the final concentration of the enzyme in the fracturing fluid was 20ppm, and then added 1.0% borax Cross-linking (cross-linking ratio 100:5), after 30s, it will form a hanging vegetable jelly. Put the cross-linked jelly into a jar, place it in a water bath at 45°C and let it stand for a gel breaking reaction. Samples were taken and analyzed every half an hour. The results showed that the viscosity of the fracturing fluid dropped to 3mPa·s in 2.0 hours.

Embodiment 3

[0053] Preparation of fracturing optimization agent: 130 grams of potassium hydroxide and 215 grams of ammonia water (concentration 28%) were mixed at room temperature, and then 30 grams of glacial acetic acid and 125 grams of phosphoric acid were mixed to prepare acid-base solutions respectively. Quickly add the lye through the dropping funnel into the three-necked bottle containing the acid solution with a condenser tube. During the feeding process, a violent exothermic reaction occurs. After cooling, it will contain KH 2 PO 4 , K 2 HPO4, NH 4 h 2 PO 4 and (NH 4 ) 2 HPO 4 fracturing optimizer solution. It can be directly used to prepare base fluid for fracturing or added to cross-linked jelly together with biological enzyme gel breaker for gel breaking reaction.

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Abstract

The invention relates to a fracturing fluid system, in particular to an environment-friendly and bio-available green fracturing fluid system, which contains the following components in parts by weight: 0.30-0.55% of vegetable gum polymer, 10-20ppm of biofungicide, a cross-linking agent (1-1.5% of borax water solution, and cross-linking ratio: 100:5 to 100:10), a pH value adjusting agent, 0.018-0.025% of biological discharge aiding agent, 5-30ppm of enzyme breaker, 1-3% of clay stabilizer, 0.25-0.3% of fracturing optimizer, and the balance of water. The fracturing fluid system furthest uses non-toxic and innoxious natural products to replace toxic and noxious chemical additive, thus achieving environment friendliness; and working fluid which is injected into the formation and returned to the ground is biodegradable and bio-repairable, and flowback liquid can be recycled, thus saving energy and reducing emission. The fracturing fluid system is a more ideal fracturing fluid system.

Description

technical field [0001] The invention relates to a fracturing system, in particular to a novel fracturing fluid system for oil field vegetable glue which is green and environmentally friendly and which can utilize biomass. Background technique [0002] Oilfield hydraulic fracturing is one of the operations where a lot of chemical contamination of the formation and polymer damage occurs. During fracturing construction, non-biodegradable chemical substances should be added to the fracturing fluid, and polymers are not completely broken by oxidants such as persulfate. Gel, due to the characteristics of this kind of material and the gel breaking mechanism, traditional chemical gel breakers have gradually highlighted many difficult bottlenecks, which greatly affect the fracturing effect. The average molecular weight range of the polymer in the flowback liquid is 2.5×10 5 -5.0×10 5 , about 20% of the polymer has not been degraded substantially, and its molecular weight is still ...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 梅晓丹刘向阳孙强陈朋王薇粱莹江磊磊靳祥史兴来
Owner DALIAN BITEOMICS INC
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