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Fracturing fluid and fracturing method for increasing applicaiton efficiency of support agent in fractured cracks

A fracturing fluid and proppant technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of poor suspended sand performance, poor fracturing effect, weakened fiber strength, etc. To achieve the effect of improving the conductivity, reducing the sedimentation rate, and evenly distributing

Active Publication Date: 2013-04-03
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the water-based fracturing fluid is still dominated by viscous suspended sand, although it has played a role in improving the efficiency of proppant laying to a certain extent, the fracturing fluid with too high viscosity will cause damage to the fracture propping zone and fracture surface , and the fracturing effect is not good; and because the existing gas is easily adsorbed on the fiber, this weakens the strength of the fiber itself to a large extent, and actually causes poor sand suspension performance

Method used

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  • Fracturing fluid and fracturing method for increasing applicaiton efficiency of support agent in fractured cracks
  • Fracturing fluid and fracturing method for increasing applicaiton efficiency of support agent in fractured cracks

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1: Effect experiment of suspended sand fiber at room temperature

[0062] Under room temperature, add and measure 2000ml tap water successively, add 8g hydroxypropyl guar gum (Jingkun Oilfield Chemical Technology Development Company), 0.5g citric acid (commercially available) successively under stirring condition, stir to dissolve completely, place 4 hours. Use sodium hydroxide solution to adjust the pH value to about 10-11, measure 600ml glue solution and divide it into three parts, add 2.25g fiber FBR-8 (curved shape, maximum length 10mm, diameter 15μm, average tensile strength 2400MPa; Beijing Kemax Oilfield Chemical Agent Technology Co., Ltd.), and stir to make it evenly dispersed; one part does not add fiber, and the other part adds commonly used linear fiber (used as a control). Then add 2.5ml of organoboron crosslinking agent YP-150 (Beijing Kemashi Oilfield Chemical Agent Technology Co., Ltd.) to the three solutions to make it crosslinked; finally add 2...

Embodiment 2

[0068] Embodiment 2: Fracturing stimulation of the present invention

[0069] In November 2010, fiber suspended sand fracturing was carried out on the well A. The fracturing method and composition of fracturing fluid are as follows.

[0070] The fracturing method can be summarized as: 4.0m 3 Displacement per minute injects prefluid 180m 3 Make seams, and then 3.5 ~ 4.0m 3 Displacement per minute to inject fiber sand-carrying liquid 150m 3 , the fiber concentration is 0.3% by weight, the fiber length is 8mm, the fiber diameter is 15μm, and ceramsite (40-60 mesh medium-strength ceramsite) is added to 32.1m 3 , the results show that a better fracturing stimulation effect is obtained. The specific implementation steps are (wherein, in the case of no specific description, the sources of materials such as reagents used in this embodiment are the same as those in Example 1):

[0071] (1) Use pre-fluid 180m 3 , to 4.0m 3 Displacement per minute is injected into formation fractu...

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Abstract

The invention relates to a fracturing fluid and fracturing method for increasing the application efficiency of a support agent in a fractured crack. The fracturing fluid is a water-based fracturing fluid and comprises sand-suspending fibers and a thickening agent, wherein the sand-suspending fibers are hydrophilic high-strength bent organic fibers or inorganic fibers. The fracturing method comprises the step of injecting the fracturing fluid serving as a sand carrying fluid into a formation crack, wherein the injection parameters of the sand-carrying fluid are as follows: the consumption is 40-3000m<3> and the injection speed is 2.0-15.0m<3> / min. The support agent is suspended by using a three-dimensional net structure formed by the sand-suspending fibers. According to the method, the content of guar gum in the sand-carrying fluid can be reduced, and the application efficiency of the support agent in a longitudinal direction is increased, and therefore, the support agent is more uniformly distributed in the longitudinal direction of a manual fractured crack, the guide performance of the crack in the whole longitudinal profile is improved, and the economic benefit of fracturing constructing is increased.

Description

technical field [0001] The invention relates to a fracturing fluid and an oil and gas well fracturing method in the technical field of petroleum and natural gas exploitation, in particular to using fiber-assisted suspension proppants to improve the proppant in fractures during the fracturing process of oil and gas reservoirs in low-permeability reservoirs. New fracturing fluids and fracturing methods that improve the fracturing effect. 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 development effect and benefit of low p...

Claims

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Application Information

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IPC IPC(8): C09K8/68E21B43/267
Inventor 周福建刘玉章丁云宏杨贤友刘雄飞吕述奇张福祥石阳李向东熊春明连胜江亓海燕杨向同
Owner PETROCHINA CO LTD
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