摘要:
The current invention provides methods of using and drilling and servicing fluid compositions for depositing and removing filter cake from the walls of a well bore. The compositions make use of particulate solid bridging agent comprised of a salt of an organic acid. The bridging particles are dissolvable by a clean-up solution comprised of a mild solvent that is less corrosive than the conventional strong mineral acids used for this purpose.
摘要:
Methods and compositions for sealing subterranean zones having temperatures in the range of from about 80° F. to about 300° F. are provided. A method of the invention is basically comprised of the steps of providing a subterranean zone sealing composition that becomes substantially rigid when exposed to subterranean zone temperatures above about 80° F. and has a pH above about 8.5 comprised of water, a substantially fully hydrated depolymerized polymer and a cross-linking agent. The sealing composition is introduced into the subterranean zone whereby it becomes rigid and seals the zone. The sealing composition can subsequently be removed by contact with a fluid having a pH below about 8 when a boron compound is utilized as the cross-linking agent.
摘要:
Viscous well treating fluids and methods of treating subterranean zones penetrated by well bores are provided. The viscous fluids are basically comprised of water, a gelling agent and a delayed viscosity breaker comprising pentanedione peroxide.
摘要:
A sludge cleaning lance advancing apparatus includes a frame having a lead screw rotatably disposed in the frame. An electric stepping motor is connected to the frame and a belt and pulley drive is connected between the stepping motor and the lead screw for rotating the lead screw upon rotation of a shaft of the stepping motor. A lance carrier has an internal screw thread engaging the lead screw, and the lance carrier and lead screw are so arranged and constructed that the lance carrier is moved longitudinally relative to the lead screw as the lead screw is rotated relative to the lance carrier. A lance is carried by the lance carrier. A handwheel is attached to the lead screw for manually rotating the lead screw to initially position the lance. An alignment rod is provided to aid in this initial positioning.
摘要:
A method of increasing the fracture complexity in a treatment zone of a subterranean formation is provided. The subterranean formation is characterized by having a matrix permeability less than 1.0 microDarcy. The method includes the step of pumping one or more fracturing fluids into a far-field region of a treatment zone of the subterranean formation at a rate and pressure above the fracture pressure of the treatment zone. A first fracturing fluid of the one or more fracturing fluids includes a first solid particulate, wherein: (a) the first solid particulate includes a particle size distribution for bridging the pore throats of a proppant pack previously formed or to be formed in the treatment zone; and (b) the first solid particulate comprises a degradable material. In an embodiment, the first solid particulate is in an insufficient amount in the first fracturing fluid to increase the packed volume fraction of any region of the proppant pack to greater than 73%. Similar methods using stepwise fracturing fluids and remedial fracturing treatments are provided.
摘要:
Fracturing operations can be problematic in completed wellbores containing at least one existing fracture, since it can be difficult to seal an existing fracture and initiate a new fracture within a reasonable timeframe due to the presence of particulate materials in the wellbore. Methods for fracturing a completed wellbore can comprise introducing a treatment fluid comprising a plurality of degradable sealing particulates into a completed wellbore penetrating a subterranean formation having an existing fracture therein; sealing the existing fracture with at least a portion of the degradable sealing particulates, thereby forming a degradable particulate seal; after sealing, allowing any degradable sealing particulates remaining in the treatment fluid to degrade, such that the treatment fluid becomes substantially particulate free; and after the treatment fluid becomes substantially particulate free, fracturing the subterranean formation so as to introduce at least one new fracture therein.
摘要:
Anhydrous borate compounds can be used in a variety of subterranean treatment operations, where particulates of the anhydrous borate compounds slowly become soluble in an aqueous fluid after facilitating the treatment operation. Cleanup fluids can be used for affecting a more rapid removal of the anhydrous borate compounds from a subterranean formation. Methods for performing a cleanup of anhydrous borate compounds within a subterranean formation can comprise providing a cleanup fluid comprising a polyhydroxylated compound, introducing the cleanup fluid into a subterranean formation having a plurality of anhydrous borate particulates therein, and interacting the polyhydroxylated compound with the anhydrous borate particulates such that the anhydrous borate particulates become soluble in an aqueous fluid.
摘要:
Methods of reducing the permeability of a subterranean formation to aqueous-based fluids using a water-soluble relative permeability modifier that comprises a reaction product of a hydrophilic compound and a hydrophilic polymer. In some methods the hydrophilic polymer may be selected from the group consisting of: a polyacrylamide, a polyvinylamine, a poly(vinylamine/vinyl alcohol), an alkyl acrylate polymer, and a combination thereof. In other methods the hydrophilic polymer may be selected from the group consisting of: a polyvinylamine; a poly(vinylamine/vinyl alcohol); a cellulose; a chitosan; a polyamide; a polyetheramine; a polyethyleneimine; a polyhydroxyetheramine; a polylysine; a polysulfone; a gum; a starch, and a combination thereof.
摘要:
Methods including providing a downhole tool or a component thereof comprising a plasticized polymer composition that comprises a polymer and a water-soluble plasticizer, wherein the plasticized polymer composition has a first deflection test value; exposing the downhole tool or the component thereof to an aqueous-based medium; allowing the water-soluble plasticizer to leach out of the downhole tool or the component thereof, wherein the plasticized polymer composition has a second deflection test value after exposure to the aqueous-based medium, and wherein the second deflection test value is less than about 10% of the first deflection test value; and placing the downhole tool or the component thereof in a subterranean formation.