Oil-gas well fiber assisted water control fracturing method

Abstract

The invention relates to an oil-gas well fiber assisted water control fracturing method, and belongs to the technical field of petroleum extraction. The method comprises the following steps of: (1) adding a thickening agent with water control function into water with stirring, and then adding additive to obtain fracturing prepared fluid; (2) mixing a part of the fracturing prepared fluid preparedin the step (1) and fiber uniformly to obtain fracturing sand-carrying fluid; (3) adding a propping agent into the fracturing sand-carrying fluid prepared in the step (2) to obtain sand mixing fluid;and (4) pumping the rest fracturing prepared fluid prepared in the step (1) into a destination layer in an oil-gas well, and then pumping the sand mixing fluid prepared in the step (3). According to the method, the thickening agent is adopted, so functions of seam forming and sand carrying of the conventional thickening agent are obtained, and the oil (gas) water ratio in the oil-gas layer can bechanged and the permeability of the aqueous phase is greatly reduced.

Description

technical field [0001] The invention relates to a fiber-assisted water-controlling fracturing method for oil and gas wells, in particular to a fiber-assisted water-controlling fracturing method for oil-gas wells near water or high-water content and low-permeability oil-gas reservoirs, and belongs to the technical field of petroleum exploitation. Background technique [0002] It has always been a difficult problem to perform water-controlled fracturing and effectively control water production in near-water and high-water-cut reservoirs. Production wells produce a large amount of water, which usually leads to a rapid decline in oil production and increased energy consumption for oil production. A large amount of water treatment increases production costs, and also causes other problems such as sand production, corrosion, and scaling. The well was forced to shut down early and stop production due to no economic value of exploitation. At present, the proportion of oil and gas f...

AI Technical Summary

Problems solved by technology

However, the above-mentioned technologies all have the following disadvantages: 1. The artificial shielding layer has certain permeability, which cannot effectively prevent the bottom water from coning into the wellbore, and cannot effectively avoid the problem of water flooding of oil and gas wells; The cracking fluid basically does not reduce viscosity when it meets water, so the diversion agent or temporary plugging agent carried by it settles slowly; Crack construction is likely to cause reservoir damage

This patent requires heating to melt paraffin wax or microcrystalline wax, and then cool down in the coating machine to form a coated proppant. This process consumes a lot of energy and is not conducive to on-site operation. Therefore, it is very inconvenient in practical applications

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