Method for testing matrix damage rate applied to plugging agent

Abstract

The invention discloses a method for testing matrix damage rate applied to a plugging agent. The method comprises the steps of: (a) preparing a repeated fracturing blocking agent and selecting a plurality of cores for later use; (b) respectively splitting the selected cores, and manufacturing an artificial fracture; (c) paving a layer of particulate matter inside a fracture, and simulating a fracturing fracture; (d) injecting the repeated fracturing blocking agent into an analogue fracturing fracture to stew for a period of time; (e) cleaning sand in each core after injecting the liquid, firmly bonding the fracture and determining the matrix permeability, and (f) obtaining the matrix damage rate through the measured matrix permeability. The matrix damage rate of the repeated fracturing blocking agent can be rapidly tested by the method; the method is simple in test process and accurate in test result, and the data support is provided for use of the repeated fracturing blocking agent.

Description

technical field [0001] The invention relates to a method for testing matrix damage rate applied to blocking agent. Background technique [0002] Low-permeability reservoirs in my country generally refer to reservoirs composed of oil layers with a permeability between 10-50×10-3μm2. With the continuous deepening of exploration and development, my country's low-permeability oil reservoirs account for an increasing proportion of the total proven reserves and produced reserves, and play an increasingly important role in maintaining and promoting the development of the petroleum industry. big. Take China National Petroleum Corporation as an example. By the end of 2001, the proven oil reserves in place were 145×108t, of which low-permeability reserves were 44×108t, accounting for 30%; the produced oil reserves were 110×108t, of which low-permeability reserves were 21×108t , accounting for 19%; the remaining proven undeveloped petroleum geological reserves are 35×108t, of which lo...

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Problems solved by technology

[0004] Oil, gas, and water wells after hydraulic fracturing, due to the limitations of fracturing technology, materials, equipment and tools at that time, were small in scale, improperly selected materials, and limited equipment power, etc., would lead to a significant reduction in the conductivity of hydraulic fractures and gradually Some of them are not effective due to improper well layer selection or operational reasons. At the same time, after long-term development, major oil and gas fields have entered the development stage of medium and high water cut periods, and it is becoming more and more difficult to achieve high and stable production. For this type of oil and gas Wells that require refracturing for high production and economic recovery

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