Accurate proppant placement method for hydraulic fracturing of multi-interlayer oil-gas reservoir

Abstract

The invention discloses an accurate proppant placement method for hydraulic fracturing of a multi-interlayer oil-gas reservoir. The accurate proppant placement method comprises the steps of firstly obtaining geological parameters and physical parameters of a fracturing interval according to logging data, and dividing the fracturing interval into different small fracturing transformation layers onthe basis; then, optimizing a perforation position according to fracture closing time, and determining the proppant densities of the different fracturing transformation layers in cooperation with field practice; by calculating the proppant settling velocity `affected by sand-carrying concentration and a fracture wall effect, designing the apparent viscosity of fracturing fluids in different smallfracturing transformation layers; and finally, calculating the pumping times of the sand-carrying liquid at different stages according to the thicknesses of different small fracturing transformation layers. According to the design parameters, a proppant can be all paved on a target production layer so that the proppant can be uniformly paved in the longitudinal direction of the production layer after fracture closing. The accurate proppant placement method is reliable in principle and strong in site operability and has a wide market prospect.

Description

technical field [0001] The invention relates to a method for accurately placing a proppant for hydraulic fracturing of multi-compartment interlayer oil and gas reservoirs in the process of hydraulic fracturing in the field of petroleum engineering. Background technique [0002] Hydraulic fracturing technology is an important measure for oil and gas reservoir stimulation. Hydraulic fracturing is to use the surface high-pressure pump group to pump the fracturing fluid (pre-fluid) into the formation with a displacement exceeding the formation's liquid absorption capacity to generate fractures, and then continue to inject the fracturing fluid with proppant (sand grains) ( Sand-carrying fluid) to make the fracture continue to extend and fill it with proppant. When the fracturing fluid flows back, the proppant left in the fracture prevents the fracture from completely closing and keeps the fracture at a certain level under the closing pressure. The degree of opening is to form a ...

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Problems solved by technology

[0004] At present, there are many design methods for optimizing hydraulic fracturing construction parameters at home and abroad, but for the fracturing stimulation section containing multiple interlayers, there are few theoretical studies on the optimal design of hydraulic fracturing construction parameters from the perspective of proppant settlement characteristics , cannot meet the design requirements of the current on-site fracturing construction, the operability of the fracturing construction process is poor, the proppant cannot be accurately transported to the target layer, the laying efficiency of the proppant is low, and the stimulation effect on the oil and gas reservoir is poor

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