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.
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[0079] Example 1: Effect experiment of suspended sand fiber at room temperature
[0080] At room temperature, a fracturing fluid with the following composition is configured: 200ml fresh water; ceramic fiber (length 10mm, diameter 15μm, tensile strength 3000Mpa; Beijing Kemax Oilfield Chemical Technology Co., Ltd.) 1.6g; 200 mesh degradable starch (Filtrate reducer) 3g; fluorine-containing surfactant (drainage aid, FC203, Shaowu Huaxin Chemical) 1g; cetyltrimethylammonium bromide (commercially available) 1g.
[0081] The fracturing fluid was placed at room temperature, and the viscosity was measured to be 9 mPa·s after 15 minutes, and the fracturing fluid was observed visually. Such as figure 1 As shown, it was observed in this experiment that the fracturing fluid sample containing suspended sand fibers achieved excellent sand suspension effects.
Example Embodiment
[0084] Example 2: Low-displacement fracturing of the present invention
[0085] Such as image 3 As shown, the relationship between the gas and water layers of the Sebei gas field in the Qaidam Basin is complicated, with bottom water, edge water and interlayer water. For gas-water interbeds, the bottom water is close to the gas layer or the gas-water layer is within 10m of the reservoir. , Using conventional fracturing technology, due to the longitudinal extension of the fractures, the close water layer will be separated, causing the water layer to communicate and causing the gas layer to be flooded, causing a large amount of water to flow out of the gas well and fracturing failure (such as As shown in Comparative Example 1).
[0086] Figure 4 The fracturing string diagram of Well A is shown. Such as Figure 4 As shown, the gas layers of this well are 1700.2m~1701.6m, 1703.8m~1707.2m, 1708.8m~1712.8m, and 1716.1m~1719.9m. The cumulative effective thickness is 12.6m and the span i...
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