Design method for particle size distribution of fractured leakage bridging leaking stoppage particle material

Abstract

The invention discloses a design method of particle size distribution of a fractured leakage bridging leaking stoppage particle material. The design method comprises the following steps of grading theleaking stoppage material according to the particle size; calculating the expected range of the characteristic particle size value of the leaking stoppage material according to the crack width and particle size selection criterion; setting the relative percentage content of each stage of leaking stoppage material; fitting a particle size distribution curve by using a particle size distribution function; calculating a characteristic particle size value of the plugging material according to the particle size distribution curve; judging whether the calculated characteristic particle size value conforms to the expected range of the characteristic particle size value calculated in the step S20 or not; and finally generating the particle composition of the plugging material according with the particle selection criterion. According to the method, it can be guaranteed that the leaking stoppage granular materials enter the cracks to form the stable blocking interlayer, the blocking interlayeris high in compactness and suitable for the bridging leaking stoppage technology of fractured formation leakage, and the method has the beneficial effects of being clear in physical significance, facilitating engineering operation and the like.

Description

technical field [0001] The invention relates to a method for designing the particle size distribution of a fractured leakage bridging plugging granular material, which belongs to the field of petroleum engineering drilling. Background technique [0002] Lost circulation is one of the common downhole complex problems in the drilling process. The associated consequences of lost circulation such as loss of expensive drilling fluids, downtime, wellbore instability and, in some cases, blowouts are more serious incidents than lost circulation itself. According to the different formations where leakage occurs, well lost circulation is generally divided into three types: permeability loss, fracture loss and cavern loss, among which fracture loss is the most common and most difficult type of loss. Fracture leakage not only leads to a large waste of drilling fluid and increases the cost of drilling, but also prolongs the well construction period of oil and gas wells, seriously hinder...

AI Technical Summary

Problems solved by technology

However, the existing plugging material particle size design criteria are not ideal for the plugging effect of fracture leakage in the actual application process.

The reason is that, on the one hand, most of the existing design methods for the particle size distribution of leak plugging materials for fractured leakage directly apply the particle size design method for plugged materials for The particle size design methods of plugging materials for permanent leakage are all based on the traditional short-fractured plate experiment, and the connotations of the design methods vary greatly, which ultimately leads to unsatisfactory bridging plugging effects for fractured leakage

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