Fracturing fluid for controlling extension of fracture and fracturing method

A fracturing fluid and hydraulic fracturing technology, which is applied in the fracturing field to control the extension height of fracturing fractures, can solve problems such as clogging of fracturing zones, and achieve the effect of improving economic benefits.

Active Publication Date: 2013-02-13
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this fracturing fluid is still disadvantageous for low-volume fracturing methods due to the possibility of clogging the fracture zone after the cross-linking agent and viscosifier form a cross-linked network

Method used

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  • Fracturing fluid for controlling extension of fracture and fracturing method
  • Fracturing fluid for controlling extension of fracture and fracturing method
  • Fracturing fluid for controlling extension of fracture and fracturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Example 1: Effect experiment of suspended sand fiber at room temperature

[0080] At room temperature, a fracturing fluid with the following composition was prepared: 200ml of fresh water; 1.6g of ceramic fiber (length 10mm, diameter 15μm, tensile strength 3000Mpa; Beijing Kemax Oilfield Chemical Technology Co., Ltd.); 200 mesh degradable starch (fluid loss reducer) 3g; fluorine-containing surfactant (drainage aid, FC203, Shaowu Huaxin Chemical Industry) 1g; cetyltrimethylammonium bromide (commercially available) 1g.

[0081] The fracturing fluid was placed at room temperature, and its viscosity was measured to be 9 mPa.s after 15 minutes, and was observed visually. Such as figure 1 As shown, in this experiment, it was observed that the fracturing fluid samples containing sand-suspending fibers achieved excellent sand-suspending effects.

Embodiment 2

[0084] Example 2: Low Displacement Fracturing of the Invention

[0085] Such as image 3 As shown, the relationship between gas and water layers in the Sebei Gas Field in the Qaidam Basin is complex, and there are bottom water, edge water and interlayer water. , using the conventional fracturing technology, due to the vertical extension of the fracture, the water layers that are close to each other will be pressed apart, resulting in the communication of the water layers and the water flooding of the gas layers, which will cause a large amount of water from the gas well, and the fracturing failure (such as as shown in Comparative Example 1).

[0086] Figure 4 A diagram of the fracturing string for Well A is shown. Such as Figure 4 As shown, the gas layer intervals of this well are 1700.2m-1701.6m, 1703.8m-1707.2m, 1708.8m-1712.8m and 1716.1m-1719.9m, with a cumulative effective thickness of 12.6m and a span of 19.7m. Among them, there are multiple gas-water layers and g...

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Abstract

The invention relates to a fracturing fluid for controlling extension of a fracture and a fracturing method. The fracturing fluid is used as sand-carrying fluid. The viscosity of the fracturing fluid is below 10mPa.s. The fluid contains suspended-sand fibers which may be hydrophilic high-strength organic fibers or inorganic fibers, but do not contain cross-linking agent. The suspended-sand fibers in the fracturing fluid form a three-dimensional network structure to suspend a propping agent, and therefore can replace thickening agent to reduce the viscosity of the fracturing fluid. The fracturing method comprises the step of injecting the fracturing fluid carrying the propping agent into a stratum under a condition of low discharge volume so as to effectively control the extension of the fracture. The fracturing fluid and the fracturing method are very suitable for fracture stimulation of a thin bed reservoir and can meet the fracturing requirements of thin bed reservoirs and oil and gas reservoirs with bottom water and inter-stratum oil and gas reservoirs.

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 instead of guar gum suspending proppant during the fracturing process of oil and gas reservoirs in thin reservoirs so as to reduce fracturing The viscosity of the fluid is used to control the fracturing method of the extension height of the fracturing fracture. 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 productivity and development effect a...

Claims

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Application Information

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IPC IPC(8): C09K8/66C09K8/68E21B43/267
Inventor 周福建刘玉章丁云宏杨贤友刘雄飞卢拥军张福祥熊春明吕述奇石阳李向东连胜江杨向同
Owner PETROCHINA CO LTD
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