Abstract:
Slurries of relatively fine particles of solids wastes and similar materials are disposed of through injection wells (24) which penetrate earth formation (13) disposal zones which have a minimum in situ compressive stress generally less than an overburden zone (14) and an underburden zone (18) adjacent to the disposal zone (16). The disposal zone preferably has a permeability greater than the overburden and underburden zones. The slurry is injected through a disposal well intersecting all of the zones and having perforations (44, 46, 48) preferably communicating the slurry with the underburden zone to provide for lateral growth of the hydraulically fractured disposal zone as the solids filter cake plates out on the fracture faces of the disposal zone without substantially penetrating the overburden zone.
Abstract:
Slurried solid waste materials are injected into subterranean earth formations in a zone of interest (102) which has a relatively low in situ compressive stress (96) bounded by zones of higher in situ compressive stress (98, 100) and wherein the zone of interest has alternate layers of material of relatively high and low permeability to fluid flow, respectively. The solid waste slurry is conducted through an injection well (92) penetrating the zone of interest to form a conventional two-winged hydraulic fracture (132, 134). The fracture is extended by reducing the tendency to form filtercake in the fracture adjacent to the layers of material of relatively low permeability (142, 144) while depositing particle filtercake adjacent the earth layers of high permeability (146, 148, 150) so as to provide clear fluid flowpaths through the fracture while allowing the filtercake layers disposed in the fracture to assist in propping the fracture open.
Abstract:
A method of cementing a well penetrating a subterranean formation and having a deviated section (21) of more than 55 degrees angle of inclination in which a plurality of cement slurries (25, 35) are employed, at least one of which is less dense than the drilling fluid employed to drill the well, and allowing the cement to set up in the well and to bond in situ and provide zonal isolation and good bonding of equipment in the wellbore. The cement slurry may include micro-spheres of fly ash or borosilicate to reduce free water voids of channels in the cement.
Abstract:
Multiphase (gas and two liquid phases) fluid flowstreams are measured to determine the total flow rate, fluid density, the fraction of gas, and one liquid in the total liquid mixture by passing the flowstream through a volumetric or mass flow meter (16, 40), a densimeter (12) and a meter (14) which measures the fraction of one liquid in the two liquid mixture. The total fluid flow rate may be measured by a single tube flow meter (40) having adjacent loops which provide tube legs (49, 51) positioned adjacent each other and vibrated laterally at a predetermined frequency and amplitude while measuring pressures in the contraflowing streams in the adjacent tube legs. The density and gas fraction of the flowstream may be determined by vibrating a tube containing the flowstream over a range of frequencies and measuring the phase angle and amplitude of the fluctuating fluid pressures compared with acceleration of the tube to determine the sloshing natural frequency of the fluid mixture. The tube may be vibrated at a frequency far from the sloshing natural frequency of the fluid mixture to determine the fluid density.
Abstract:
True vapor pressure of liquid compositions, particularly multi-component compositions, is measured by a piston and cylinder apparatus (14) defining an expansible chamber (84) in which a sample of liquid is trapped, the chamber (84) is expanded in multiple steps and multiple pressure and temperature measurements are taken at each expansion over a period of time. A resultant pressure at each expansion is determined from multiple measurements using the least squares method of approximation and the plural resultant pressure values are extrapolated to determine true vapor pressure using a straight-line approximation. The apparatus is adapted to continuously measure vapor pressure of a process stream by sampling a slipstream of liquid which is maintained at a constant temperature. The apparatus is mounted horizontally to minimize liquid depth and increase the rate of bubble formation during expansion of the chamber.
Abstract:
A method and a treating mixture for controlling lost circulation of fluid from a well bore to a formation wherein the treating mixture is flowed down the wellbore to block flow into the formation. The mixture is comprised of a non-aqueous carrier liquid (e.g. diesel and particles of compressed sponge) which expands upon contact with an aquous liquid in the formation. The mixture may also contain a second lost circulation material (e.g. unhydrolyzed polyacrylamide) which hydrates to bridge and plug any voids or spaces left between the expanded sponge particles. When used to control lost of an aqueous liquid, e.g. water-based mud, a non-aqueous liquid (e.g. diesel) is used ahead and behind the treating mixture to separate it from aqueous liquids. When used to control loss of an oil-based liquid, water is pumped behind the treating mixture to provide the aqueous liquid necessary for expanding the sponge particles once they are in place.
Abstract:
A transducer (40, 1400) and method for imparting vibrational signals to a structure (10) are disclosed. In one embodiment, a set of piezoelectric disks (53, 54) are constructed in conjunction with a deformable housing (43) to impart controlled distortions to the structure, such as to a well pipe string (10). Both longitudinal and torsional forces can be applied to the structure (10) depending upon the application. To improve transmission, the apparatus can be tuned to a frequency determined by a spectrum analysis of the pipe string (10). A reactance mass (44) may be connected to the transducer (40, 1400) to increase the amplitude of the imparted vibrations, and also to allow tuning of the frequency of vibrations of the transducer (40, 1400).
Abstract:
A transducer and method for imparting vibrational signals to a structure are disclosed. In one embodiment, a set of piezoelectric elements (53, 54) are constructed in conjunction with a deformable housing (43) to impart controlled distortions to the structure, such as to a well pipe string (10). In another embodiment, torsional forces are applied to the structure (10) due to the orientation of the piezoelectric material (1601) relative to the electric field applied thereto. The piezoelectric material (1601) is placed in layers, with the polarization axis orthogonal to the direction of the electric field. Alternate layers are oriented in opposing directions, and alternating electrodes (1603, 1604) are connected together, so that each layer cooperates with the others to twist the shaft (1501) in the same direction. To improve transmission, the apparatus can be tuned to a frequency determined by a spectrum analysis of the pipe string (10). A reactance mass (44) may be connected to the transducer to increase the amplitude of the imparted vibrations, and also to allow tuning of the frequency of vibrations of the transducer (1401).
Abstract:
Wellbore fluid flow rates and other fluid properties may be measured by a tool (10) which is insertable in the well bore on the end of a tubing string (14) and includes an instrument section (116) and an inflatable packer (140) disposed on the tool for inflation by conducting pressure fluid down the tubing string to the packer. A control valve (58) disposed on the tool is hydraulically shiftable between first and second positions for conducting fluid from the tubing string (14) to the packer (140) and from the packer (140) the exterior of the tool. The valve (58) may be actuated by fluid conducted down the tubing string. The tool includes housing parts having respective cavities for conducting wellbore fluid through a flowmeter (124) and for containing instrument circuit enclosures disposed therein. Pressure fluid bypasses the cavities through elongated passages formed in the tool housing parts along or adjacent to the outer periphery of the housing parts. A frangible coupling (153) is interposed in the tool between the packer and the instrument section.
Abstract:
A fluid flow measuring or so-called production logging instrument (24) for fluids produced in a well includes an inflatable packer (38) for forming a seal (40) in the wellbore (10) to require diversion of wellbore fluid through a passage formed in the instrument whereby fluid flow rate and other fluid properties may be measured. The inflatable packer (38) receives pressure fluid from the tubing string (22) and may be remotely controlled to inflate and deflate, at will, through signals conducted from the surface to the instrument by way of a cable (30) extending through the tubing string. The instrument (24) includes a main wellbore fluid flow passage in which a shutoff valve (92) is disposed for controlling the flow of fluid through the passage and which may be automatically closed or opened in response to actuation of the packer seal (40).