Baker Hughes Corporation

Other

David W Schwertner

William S Halliday

Dennis K Clapper

Tao Xiang

S Dwight Strickland

William Halliday

Methods for minimizing the amount of graphite particles used during drilling operations, the methods comprise performing drilling operations using a drilling fluid system having effective rheological and fluid loss control properties, the drilling fluid system comprising a mixture of graphite particles having an effective particle size distribution.

Methods for minimizing the amount of graphite particles used during drilling operations

A water-based drilling fluid having a polymer latex capable of providing a deformable latex film on at least a portion of a subterranean formation has been discovered to provide reduced drilling fluid pressure invasion when used to drill in shale formations for hydrocarbon recovery operations. A precipitating agent such as a silicate or an aluminum complex (e.g. sodium aluminate) is preferably used in conjunction with the polymer. Typically, the water present contains a salt to form a brine, often to saturation, although the invention may be practiced with fresh water. If a salt is employed, it is often helpful to additionally employ a surfactant, such as a betaine, for example.

Water-based drilling fluids using latex additives

An oil-based drilling fluid having a polymer latex capable of providing a deformable latex film on at least a portion of a subterranean sand formation has been discovered to inhibit or control fluid loss and act as a sealing agent when used to drill in sand formations for hydrocarbon recovery operations. Typically, the polymer latex is an aqueous suspension of particles formed by emulsion polymerization that is in turn emulsified into a hydrocarbon base fluid. The polymer particles of suitable size precipitate onto the pores of a subterranean sand formation to at least partial seal the formation with a deformable polymer film.

Fluid loss control and sealing agent for drilling depleted sand formations

Drilling fluid systems, graphite particle mixtures, and methods for use thereof including: (a) drilling fluid systems having effective rheology and lubricity properties comprising a suspension of graphite particles having a particle size distribution sufficient to permit greater than 65 wt. % of the graphite particles to pass through a shaker screen having a mesh size of about 80 or less; and (b) spotting fluids having effective rheology comprising graphite particles having an average particle size of 120 mesh or greater.

Drilling fluids comprising sized graphite particles

The present invention provides drilling fluid additives for water-based drilling muds comprising olefins having the following general structure:

Olefins and lubricants, rate of penetration enhancers, and spotting

The present invention provides non-toxic, biodegradable olefin isomers which may be used as lubricants, rate of penetration enhancers, and/or spotting fluids for water-based drilling muds. When used as a spotting fluid additive, the olefin isomers preferably are supplemented with functional additives, namely emulsifiers, viscosifiers, surfactants, and/or brine. When used as lubricants and/or rate of penetration enhancers, the olefin isomers preferably are used alone or in combination with surfactants.

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The Woodlands, TX, United States of America

David W Schwertner