Fractured sandstone separate layer fracturing acidizing method

Abstract

The invention provides a fractured sandstone separate layer fracturing acidizing method comprising the following steps; determining M to-be-clustered perforation intervals from an acid fracturing interval, perforating each to-be-clustered perforation interval, thus forming M clustered perforation intervals; dividing the M clustered perforation intervals into N levels of perforation intervals; fracturing and acidizing the N levels of perforation intervals in order according to a sequence in which the horizontal minimum crustal stresses of each level perforation interval increase up. Strong heterogeneity of a thick reservoir will enable certain perforation intervals with good permeability to absorb more acid, thus causing excess reconstruction; the perforation intervals with poor permeability absorbs less acid, thus causing non-reconstruction or low reconstruction level; the fractured sandstone separate layer fracturing acidizing method can solve said problems, thus realizing uniform reconstruction of the thick fractured sandstone reservoir, and lifting single well yield up to the maximum level.

Description

technical field [0001] The invention relates to oil field exploration and development technology, in particular to a fractured sandstone layered fracturing and acidification method. Background technique [0002] At present, fracturing and acidizing is an important measure for oil and gas well stimulation in the petroleum industry. In the process of fracturing and acidizing, a certain acidic liquid is continuously injected into the wellbore by a fracturing vehicle. When the pressure in the wellbore is higher than the fracture pressure of the formation, the formation will crack and form fractures, or expand the natural fractures of the formation. Then, the acidic liquid enters the fractures, continues to fracturing, and chemically reacts with the rocks around the fractures, dissolves the soluble substances, removes the clogging substances in the fractures, improves and increases the seepage force of the formation, and achieves the transformation of the formation. , The purpos...

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Problems solved by technology

If mechanical tool stratification is not carried out, due to the heterogeneity of the thick reservoir, that is, in the thick reservoir, the permeability of the formation is not evenly distributed, and the difference in the permeability of the formation in the vertical direction is large, so that the section with good permeability absorbs There are more acidic liquids in the layer, which leads to excessive acidification of the layer with good permeability; while the layer with poor permeability absorbs less acidic liquid, resulting in failure to achieve the purpose of formation stimulation

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