Application of aqueous solution diluent composition in sand prevention of oil-gas well

Abstract

The invention belongs to the technical field of petroleum industry oil and gas field development, and particularly relates to an application of an aqueous solution diluent composition in sand prevention of an oil-gas well, the aqueous solution diluent composition is composed of guanidine gum and sodium alginate, and an aqueous solution of the guanidine gum and sodium alginate composition is used for diluting resin in a sand prevention system. The organic polymer aqueous solution diluent can be uniformly mixed with resin, and is convenient to inject into the stratum. Loose rock and free sand can be solidified in the stratum, and high strength and compression resistance can be achieved and can reach 20 MPa or above. The danger of using an organic solvent in an oil field and the damage to thehealth of constructors are avoided, the resin can be uniformly dispersed, so that the residue of the resin in the stratum is less. By applying multiple wells including the horizontal well and the vertical well, the sand prevention effect is remarkable, the sand production phenomenon is avoided after stable production is conducted for 13 months, and the oil and gas yield is increased.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development in the petroleum industry, and in particular relates to the application of an aqueous solution diluent composition in sand control of oil and gas wells. [0002] technical background [0003] With the continuous exploration and development of oil and gas fields, the problems encountered in the exploitation of oil and gas reservoirs have gradually become more difficult. Sand production is one of the common problems in the process of sandstone oil layer exploitation, especially in unconsolidated sandstone. The adhesion between them is poor and the degree of cementation is low, so it is easy to separate out during the production process to form free sand, which flows to the bottom of the well with the production fluid, resulting in sand production. There are three main types of sand production: stable sand production, continuous sand production and unstable large-scale sand produ...

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Problems solved by technology

[0007] In order to solve the problem that the sand control agent used in the prior art is commonly used as an organic diluent for resin, most of which are poisonous, and the existing aqueous solution diluent cannot uniformly disperse the resin, resulting in the sand control agent being unable to be evenly injected into the formation. The present invention provides a Application of aqueous diluent composition in oil and gas well sand control

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