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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, reducing dosage, and improving fracturing effect.

Active Publication Date: 2016-08-03
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fiber in this document only plays the role of auxiliary sand suspension, and because the content of cross-linking agent and thickener is still high, it can be expected to still have high damage to the support belt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1: Measuring 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 (commercially available) and 40g Potassium Chloride (commercially available) successively under stirring condition, stir until Completely dissolved, thus making conventional guar gum fracturing fluid.

[0075](2) Preparation of low-damage fracturing fluid base fluid (fracturing fluid of the present invention)

[0076] Measure 2000ml of tap water, add 1g of polyacrylamide (molecular weight: 8 million, Daqing Petrochemical) and 40g of potassium chloride successively under stirring conditions, and stir until completely dissolved.

[0077] (3) Proppant permeability test

[0078] According to the oil and gas industry standard SY / T6302-2009 "Recommended method for evaluation of short-term conductivity of fra...

Embodiment 2

[0087] Embodiment 2: gas well test

[0088] In order to reduce the damage of the fracturing fluid to the gas layer and the 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 formation fractures, then use 0.08% of low-concentration guar gum + 0.35% by weight of fiber as a sand-carrying fluid, and carry proppant with different sand ratios to fill In the fractures opened, the displacement fluid is finally used to replace the sand-carrying fluid into the formation.

[0089] The specific fracturing methods are:

[0090] 1. Fracturing string

[0091] The Φ73mm outer thickened combined tubing injection method is used for construction, and the tubing is lowered to a depth of 1550m.

[0092] 2. Fracturing process

[0093] ① Use 350 cubic meters of pre-fluid and inject it into the formation opening at a displacement of 6.0 to 6.5 cubic meters pe...

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Abstract

The invention relates to a low-damage fracturing fluid and a fracturing method. The fracturing fluid is an aqueous fracturing fluid, and contains sand-suspended fibers, wherein the sand-suspended fiber is selected from hydrophilic high-strength organic fiber or inorganic fiber; and the content of the thickening agent in the fracturing fluid is lower than 0.08wt%, and the content of the crosslinking agent is lower than 0.02wt%. The fracturing fluid serving as a sand-carrying fluid in the fracturing method is injected into formation fractures, wherein the sand-carrying fluid comprises the following injection parameters including 50 to 2,000 cubic meters of dosage, and 2.0 to 15.0 cubic meters per minute of speed. According to the fracturing fluid, a high-viscosity buoyant proppant of guar gum is replaced by a three-dimensional reticular structure formed in the fracturing fluid by using the fiber, so that the dosage of guar gum can be greatly reduced, or the guar gum is not required, the damage to the wall surface and the support belt of the formation fractures can be minimized, and the economic benefit of fracture reformation can be improved.

Description

technical field [0001] The invention relates to a fracturing fluid and an oil-gas well fracturing method in the technical field of petroleum and natural gas exploitation, in particular to using fiber-assisted suspending proppant in the fracturing process of oil-gas reservoirs in low-permeability reservoirs to reduce such as Viscosity-increasing components such as thickeners and cross-linking agents are used to minimize damage to the fracture walls and support zones. Background technique [0002] my country's low-permeability oil and gas resources are huge, accounting for more than 70% of the total proven reserves, and are the main potential areas for increasing reserves and production in the future. This type of oil and gas resources has the characteristics of three lows, that is, low proven rate, low natural production rate, and low recovery rate. It has been confirmed that hydraulic fracturing is an important technical means to improve the production capacity and developm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/66C09K8/68E21B43/267
Inventor 周福建刘玉章丁云宏杨贤友刘雄飞张福祥熊春明李秀辉亓海燕张建国石阳李向东连胜江周翠红
Owner PETROCHINA CO LTD
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