Shell Oil Comapny

David R Davies

Edwin A Richardson

Adrianus M Hagelaars

Franciscus H Meijs

Marinus Van Zanten

Jacobus J Zuiderwijk

Sand grains coated with a solid non-cured epoxy resin with a softening point above 35.degree. C. are placed in a well for gravel pack, well repair or fracturing purposes. The epoxy resin softens at formation temperature and reacts with a hardener (such as a tertiary amine) diluted in water present in the pore space of the mass of sand grains. A consolidated mass of sand grains is thus obtained. The coated sand grains can be transported to the well site and stored over long periods at relatively high temperatures without risk of quality decrease.

Method of placing and consolidating a mass of particulate material and

A reservoir encountered by a drilling fluid-containing borehole can be sampled and/or a liquid can be removed from within a borehole by arranging conduits and a packer for isolating the reservoir or a selected fluid-removal location and then gas-lifting liquid by injecting an aqueous liquid solution which generates nitrogen gas within the borehole, with the depth of the injection and the rates of fluid inflow and outflow being adjusted to maintain a selected drawdown at the depth of the fluid-removal location.

Process for gas-lifting liquid from a well by injecting liquid into the

The formation is consolidated by means of a silicon halide compound that reacts with water present on the walls of the formation pore space thereby forming silicon dioxide that bonds the formation grains together. The bonding strength is increased by a pretreatment of the formation grains with an acid in liquid or gaseous form.

Method of pretreating an underground formation for silicon polyhalide

In a well treating process for consolidating a mass of particles with an epoxy resin precipitated from a resin-forming solution, a significant improvement is provided by using: a polyamino curing agent, a particular ratio of curing agent to epoxide, and a pretreatment which wets the particles with an aqueous liquid that contains an effective proportion of a dimethylaminomethyl-substituted phenol.

Process for consolidating water-wet sands with an epoxy resin-forming

An unconsolidated gas-producing sand in which the permeability is layered and the productivity can be impaired by liquid blocking can be consolidated by wetting the rock surfaces with a limited amount of water, injecting a smoke which selectively reduces the permeability of the most permeable layers by depositing on their faces unconsolidated masses of substantially inert solid particles and injecting a gaseous silicon polyhalide to convert a significant proportion of the rock surface-wetting-water to a grain bonding silica gel.

Method for diverting a gaseous sand-consolidating fluid

In a relatively weak water-wet gas-producing reservoir in which a liquid tends to impair the gas production, the rock strength is increased by injecting a silicon polyhalide vapor, such as silicon tetrachloride vapor, mixed with a relatively inert gas, so that the silicon halide converts the rock-wetting water to a rock-strengthening silica gel.

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Rijswijk, Netherlands

David R Davies