Low-damage fracturing fluid and fracturing method
A fracturing fluid and hydraulic fracturing technology, applied in chemical instruments and methods, earthwork drilling, and fluid production, etc., can solve problems such as damage to support belts, and achieve the effects of reducing damage, improving economic benefits, and being difficult to backflow.
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[0072] Example 1: Measurement of proppant permeability in the laboratory
[0073] (1) Preparation of conventional guar gum fracturing fluid
[0074] Measure 2000ml tap water, add 4g hydroxypropyl guar gum (Jingkun Oilfield Chemical Technology Development Company), 0.5g citric acid (commercial product) and 40g potassium chloride (commercial product) under stirring conditions, and stir until Completely dissolve, thereby preparing conventional guar gum fracturing fluid.
[0075] (2) Preparation of low-damage fracturing fluid base fluid (fracturing fluid of the present invention)
[0076] Measure 2000ml tap water, add 1g polyacrylamide (molecular weight 8 million, Daqing Petrochemical) and 40g potassium chloride under stirring conditions, and stir until completely dissolved.
[0077] (3) Propant permeability test
[0078] According to the oil and gas industry standard SY / T6302-2009 "Recommended method for short-term conductivity evaluation of fracturing proppant packs", the experimental con...
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[0087] Example 2: Gas well test
[0088] In order to reduce the damage of the fracturing fluid to the gas layer and proppant zone, the low-damage fracturing method of the present invention is used in the gas well. The overall plan is: use 0.08% by weight of low-concentration guar gum to hydraulically open the formation and make joints, and then use 0.08% of low-concentration guar gum solution + 0.35% by weight of fiber as the sand-carrying liquid, and carry proppants with different sand ratios to fill In the compressed cracks, the displacement fluid is finally used to displace the sand-carrying fluid to the formation.
[0089] The specific fracturing method is:
[0090] 1. Fracturing string
[0091] The Φ73mm outer thickened combined tubing injection method is used for construction, and the tubing runs into 1550m.
[0092] 2. Fracturing process
[0093] ①Use 350 cubic meters of prefluid to inject into the formation cracks with a displacement of 6.0 to 6.5 cubic meters per minute;
[009...
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