| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 141 | Method for preserving core sample integrity | US780560 | 1997-01-08 | US5881825A | 1999-03-16 | Pierre E. Collee; Dorothy P. Enright |
| The present invention provides a method for protecting the integrity of a core sample during transport from a subterranean formation to the surface comprising: cutting a core sample from the subterranean formation using a drilling fluid; encapsulating the core sample with an encapsulating material separate from the drilling fluid, the encapsulating material being capable in the absence of a chemical reaction of protecting core sample integrity during transport from said subterranean formation to said surface; and, transporting the encapsulated core sample from the subterranean formation to the surface. | ||||||
| 142 | Method and composition for preserving core sample integrity using a water soluble encapsulating material | US440451 | 1995-05-12 | US5546798A | 1996-08-20 | Pierre E. Collee; Dorothy P. Enright |
| The present invention provides a method and composition for encapsulating a core sample as it enters a core barrel with a water-based encapsulating material that preferably comprises an expandable lattice type clay. The water-base causes the expandable lattice type clay to swell, forming a plastic mass which can be pumped into a core barrel to encapsulate the core sample and maintain the chemical and mechanical integrity of the sample during transport to the surface. Filtration control agents preferably are added to the encapsulating material to prevent water from penetrating into or interacting with the core. These control agents prevent the loss and/or invasion of water or other gaseous or fluid components. The control agents are (a) a water soluble thickening agent, and, (b) a particulate sealing agent capable of (i) sealing the pores of the core sample, or (ii) bridging the pores of the core sample and permitting the thickening agent to adsorb to the bridge to seal the pores. The integrity of the core sample will be maximized if a pressure core barrel is used to transport the encapsulated core sample to the surface. | ||||||
| 143 | Method and composition for preserving core sample integrity using an encapsulating material | US51093 | 1993-04-21 | US5360074A | 1994-11-01 | Pierre E. Collee; William A. Mallow; Steven R. Radford |
| The present invention provides a method for maintaining the mechanical integrity and for maximizing the chemical integrity of a core sample during transport from a subterranean formation to the surface. The method involves cutting and encapsulating a core sample with an encapsulating material that increases in viscosity or even solidifies, at temperatures slightly lower than those expected downhole, or relatively early in the transport process. A preferred encapsulating material contains at least one polyglycol or chemically modified polyglycol from the oxyalkylene polymer family. The specific formulation of the encapsulating material differs depending upon the expected downhole conditions. For example, the encapsulating material can include a thickener, a nucleating agent, and a water swellable material or another inert material that is capable of sealing the core sample against water. A preferred nucleating agent would serve both as a heat transfer agent and a crystallization trigger, and therefore would speed up the rate at which the encapsulating material would solidify or increase in viscosity, particularly downhole. The encapsulating material should either solidify or increase in viscosity enough to protect the mechanical integrity and maximize the chemical integrity of the core sample for analysis at the surface. The chemical integrity of the core sample can be further maximized by using the present invention in conjunction with a pressure core barrel. | ||||||
| 144 | Apparatus and method for transferring whole core samples | US308487 | 1989-02-10 | US4916945A | 1990-04-17 | Kirk R. Weisbrod |
| An apparatus for transferring a whole core sample having a first end and an opposing second end from the interior of an inner barrel comprising:a split receiving tube having an interior surface sized and adapted to receive the whole core sample from the inner barrel;a liner made of heat shrink material extending over a substantial portion of the interior surface of the split receiving tube;first and second discs sized and adapted to be placed on the first and second ends, respectively, of the whole core sample; anda force assembly for forcing the whole core sample from the inner barrel into the liner in the split receiving tube. | ||||||
| 145 | Method for determining the amount of oil in a sponge core | US122622 | 1987-11-17 | US4787983A | 1988-11-29 | Rocco DiFoggio; William E. Ellington; Kailash C. B. Dangayach |
| The oil lost by the core sample and captured by the sponge during sponge coring is extracted from the sponge using a solvent selected from the group consisting of cycloalkanes, ethers, and freons. | ||||||
| 146 | Method for analyzing solvent extracted sponge core | US35111 | 1987-04-06 | US4785661A | 1988-11-22 | William E. Ellington; Clayton L. Calkin |
| A method for quantifying the volume of oil in the fluids produced by solvent extracted sponge core distills only a portion of the solvent from the solvent/oil mixture, then determines and subtracts the remaining solvent volume to yield the actual volume of oil removed from the sponge. | ||||||
| 147 | Solvent disperser for removing oil from sponge core | US35110 | 1987-04-06 | US4771634A | 1988-09-20 | Rocco DiFoggio |
| In a solvent extraction process for removing captured formation fluids from sponge core, a sintered metal plate solvent disperser directs returned solvent, in the extractor, outwardly onto the sponge in a sponge core cylinder. | ||||||
| 148 | Method and apparatus for coring with an in situ core barrel sponge | US887352 | 1986-07-21 | US4716974A | 1988-01-05 | Steven R. Radford; J. Stanley Davis |
| Jamming caused by absorbent members in sponge core barrels or loss of coring information caused by oil wipes in oil field boreholes in which sponge core coring tools are disposed can be avoided by employing a method and tool wherein the absorbent member is formed in placed in contact about the core after the has been cut and disposed within the inner tube. In the illustrated embodiment, a liquid foam is catalytically formed from two constituent parts. The constituent parts are hydraulically forced from longitudinal chambers defined within the inner tube walls into an area in the throat of the bit where the parts meet and exothermically generate a liquid foam. The liquid foam rises into a plurality of longitudinal open chambers defined within the inner tube. Each of the open chambers has a longitudinal slot defined therethrough which communicates the chamber with the axial bore in which the core is disposed. The liquid foam flows into the longitudinal chambers and into the annular space between the inside surface of the inner tube and the core. Ultimately, the core is totally immersed in the liquid foam. Thereafter, within a predetermined curing time, the liquid foam cures to form a sponge-like solid. The oil bearing core may not be retrieved to the well surface. As the core is depressurized during retrieval, oil forced from the core by escaping water and gas is retained within the sponge for later analysis. | ||||||
| 149 | Method for determining the placement of perforations in a well casing | US616410 | 1984-06-01 | US4631677A | 1986-12-23 | Arthur Park; Bob T. Wilson |
| A method for determining the productivity of a well site includes extracting a core with sponge coring techniques and measuring the parameters of the core. The parameters measured are porosity, permeability and percent mobile oil. A core factor is calculated which is the square root of the product of permeability and porosity and indicates the space available in the core for oil production. The core factor is multiplied by the percent mobile oil to provide a Production Index. The Production Index indicates the capacity of a given oil well to produce oil. With the Production Index data, perforations are selectively placed in various areas along the longitudinal axis of a well casing (38) to selectively allow communication between the interior of the well casing and a formation of interest. In this manner, only areas having high oil mobility are communicated within a given region of the formation of interest. | ||||||
| 150 | Method for obtaining pressurized core samples from underpressurized reservoirs | US403841 | 1982-07-30 | US4449594A | 1984-05-22 | Ronald L. Sparks |
| The invention provides a method for obtaining a balanced, pressurized core sample from an underpressurized geological reservoir formation. A pressure core sampling well is drilled to a preselected depth and the bottom hole reservoir pressure therein is determined. A computer is programmed to compute predicted bottom hole foam pressures at the bottom of the well produced by a stable foam coring fluid, having a preselected composition, which is introduced into the well under preselected control pressures. Measurements are than made of actual bottom hole foam pressures at the bottom of the well produced by the foam when it is introduced into the well at preselected control pressures and under core sample drilling conditions. A comparison is made between the measured bottom hole foam pressures and the computer predicted bottom hole foam pressures to derive a correlation function and to select a correlated core pressure. The selected correlated control pressure produces a foam balance pressure at the bottom of the well which substantially balances the bottom hole reservoir pressure. A core sample is then drilled while said foam is introduced into the well under the correlated control pressure. The core sample is encapsulated while the reservoir pressure within the sample is balanced by the bottom hole foam balance pressure to produce the balanced, pressurized core sample. | ||||||
| 151 | Method of coating core samples | US266990 | 1981-05-26 | US4419314A | 1983-12-06 | Darrell Bush |
| A method of coating a core sample in which a distillate such as petroleum jelly is applied to the exterior surface of the sample. A cylindrical mold is partially filled with a plastic mixture of hardenable epoxy resin and hardener therefor, and one end of the core sample is slowly inserted into the mold under a pressure which preferably is not more than about 50 pounds per square inch. In some cases the inserted end of the sample is pre-coated with the plastic mixture. As the insertion of the sample is continued, the mixture flows up the side of the sample and covers the opposite end. The coating is cured by maintaining it in the mold at room temperature for a period of time sufficient to enable the resin to set up and then by holding it at an elevated temperature for at least about eight hours. Upon the removal of the coated sample from the mold, the ends are cut off to expose the sample material. | ||||||
| 152 | Downhole core barrel flushing system | US179587 | 1980-08-21 | US4356872A | 1982-11-02 | Craig R. Hyland |
| A core barrel flushing device and method is disclosed particularly for flushing drilling fluid, mud and other undesirable material from a pressure core barrel downhole at existing conditions and pressure.The flushing device (F) comprises an outer barrel attachable to the drill string and core barrel (10), and an inner barrel (90) within the outer barrel (70). A sealed chamber (C) within the outer barrel (70) contains a piston (114) and flushing medium (M) displacable from the chamber (C) and into the core barrel during forceful displacement of the piston following actuation of the flushing device.Actuation of the flushing device is initiated by means (B) passed down the drill string into engagement with actuating means (94) allowing displacement of the piston and flushing medium from the chamber into the core barrel.Tripping means (112) are also disclosed responsive to the final movement of the piston to actuate, and seal the flushed pressure core barrel (10) and core sample (51) therein downhole. | ||||||
| 153 | Pressure core barrel flushing system | US099670 | 1979-12-03 | US4272987A | 1981-06-16 | James T. Aumann; Harold G. White |
| This invention relates to improvements in pressure core barrels of the type described in U.S. Pat. No. 3,548,958 wherein a controlled pressure is maintained on a core sample during surfacing. Among the improvements provided by the present invention are an improved arrangement of the pressure control valve, a device for positively latching the assembly (both in the open and closed positions) and the provision of a hydraulic assist for moving the outer barrel to the sealing position. Another particular feature provides an improved device for flushing drilling mud from the core barrel mechanism with sealing valve open and while the core sample is maintained substantially at a pressure at which it was sealed in the bore hole and to facilitate subsequent freezing and removal of the core sample therefrom for analysis. | ||||||
| 154 | Core barrel for obtaining and retrieving subterranean formation samples | US916466 | 1978-06-21 | US4258803A | 1981-03-31 | Charles M. Thompson; Charles T. Thompson |
| Core barrel apparatus for obtaining and retrieving sealed core samples of subterranean formations are disclosed. The core barrel comprises a sample chamber for receiving a core sample as it is formed at the bottom of a bore hole and an expansion chamber for receiving sample fluids. The expansion chamber comprises a cylinder having a movable sealing member therein adapted to movably seal the expansion chamber. The volume of the expansion chamber is determined by the position of the sealing member in the cylinder, movement of the sealing member changing the volume of the expansion chamber. The sample chamber and expansion chamber are selectively connected to one another by means of a seal therebetween. The expansion chamber is sealed closed by the sealing member at one end and said seal at the other end while the sample is being cut and received within the sample chamber. Thereafter, the lower portion of the sample chamber is sealed by a flap-valve and the expansion chamber is opened to the sample chamber. The movable sealing member moves during ascent to expand the expansion chamber and reduce the pressure therein. A cup-like member, a piston, a spheroidal member, and a bellows member are disclosed to be embodiments of the movable sealing member. Valving is provided in the sample and expansion chambers so that the chambers may be individually sealed and separated, and sample fluids removed from the chambers through the respective valves. | ||||||
| 155 | Core sampling apparatus and method | US932027 | 1978-08-08 | US4230192A | 1980-10-28 | Fritz T. Pfannkuche |
| Coring apparatus for obtaining core samples which may comprise: an outer barrel assembly, the lower end of which is adapted for connection to a core bit, the upper end of which is adapted for connection to a drill string; an inner barrel assembly concentrically disposed within the outer barrel assembly and having first and second axially spaced and fluid communicating chambers therein; and valve means carried by the inner barrel assembly and movable from an open position, in which a core sample may be received by the first chamber, to a closed position, sealingly enclosing the core sample within the first chamber. A method of obtaining core samples with the coring apparatus may comprise the steps of: lowering the coring apparatus and a core bit into a well bore on a drill string; rotating the drill string so the core bit cuts away an annular area at the bottom of the well bore, leaving a substantially cylindrical core extending upwardly into the inner barrel assembly; breaking the core near the base thereof to provide a core sample of desired length; continuing to rotate the drill string until the broken core sample is totally within the first chamber; lifting the drill string to clear core remaining in the well bore; actuating the valve assembly to sealingly enclose the core sample within the inner barrel assembly; and raising the coring apparatus to the surface of the well while allowing at least some of the fluid contained in the core sample to expand into the second chamber. | ||||||
| 156 | Expendable core nose and core catcher retainer | US40599573 | 1973-10-12 | US3833075A | 1974-09-03 | BACHMAN R; O MARA L |
| An improved corer for taking a core sample of marine sediment is dropped onto and embedded in the ocean floor. During penetration, a core sample fills an elongate barrel member. As the corer is withdrawn, a tapered corer nose remains in the sediment while the elongate barrel member is pulled free. Simultaneously, a cylindrically shaped array of flexible fingers are drawn together by an elastic band to retain the core sample inside the barrel member. Since the flexible fingers are held outside of the path of the core sample as it enters the barrel member, there is no disturbance or commingling of the different layers of the core sample when it is being taken. A one-way valve and the flexible fingers cooperate to retain the intact core sample while it is being lifted to the surface to provide an undisturbed specimen for later study by marine geologists and oceanographers.
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| 157 | Apparatus and method for obtaining core samples from soil and rock masses | US3631934D | 1970-05-01 | US3631934A | 1972-01-04 | ROCHA MANUEL COELHO MENDES DA |
| A core sample is removed from a soil or rock mass by boring a hole in the mass to a depth at which sampling is to begin and thereafter cutting a second hole in extension of the first hole and of a smaller diameter. The second hole is of a length equal to the desired sample and the second hole is filled with a hardenable binder such as cement whereupon a rigid reinforcing member is introduced into the still fluid binder for the depth of the second hole. After the binder has hardened a core of a diameter equal to the first hole is cut from the mass, the core being inclusive of the binder and reinforcing member with an intact surrounding sample of the mass.
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| 158 | Pressure core barrel | US3548958D | 1969-07-30 | US3548958A | 1970-12-22 | BLACKWELL ROBERT J; RUMBLE ROBERT C |
| 159 | Core sample retrieving apparatus | US3447615D | 1966-03-11 | US3447615A | 1969-06-03 | SCHICK CLIFFORD L |
| 160 | Apparatus for drilling core samples | US38182064 | 1964-07-10 | US3329220A | 1967-07-04 | DYER ROBERT K |
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