摘要:
Methods of procuring a core sample may involve engaging an earth formation with a cutting structure of a coring bit. A core sample may be received within a receptacle connected to the coring bit, the receptacle being lined with a sponge material. A space of about 1 mm or less may be maintained between the core sample and the sponge material. Coring tools may include a coring bit comprising an inner gage and an outer gage and a sponge material positioned to at least partially surround a core sample cut by the coring bit. A radial distance between an inner surface of the sponge material and the inner gage of the coring bit may be about 1 mm or less. A distance between a center of curvature of the inner gage and a center of curvature of the outer gage may be about 0.3 mm or less.
摘要:
Coring tools including a core tube assembly; a carrier chamber defined within the core tube assembly for storing one or more core samples drilled from a downhole formation having a wellbore fluid therein, wherein the wellbore fluid has a wellbore fluid density; a non-hydrocarbon, non-reactive heavy weight fluid (“HWF”) present within the carrier chamber, the HWF exhibiting a HWF density of about 2 pounds per gallon greater than the wellbore fluid density; a pressure housing cover selectively rotatable between (1) an open position, where the one or more core samples are able to be inserted into the carrier chamber, and (2) a closed position, where the carrier chamber is sealed; and a cover activation mechanism coupled to the core tube assembly and operable to move the pressure housing cover between the closed position and the open position.
摘要:
Methods of compensating pressure differences between interiors and exteriors of inner barrels of coring tools may involve advancing a coring tool into a wellbore, the coring tool comprising an inner barrel for receiving a core sample cut by the coring tool, a first fluid being sealed within the inner barrel. A second fluid may flow along an exterior of the inner barrel. A pressure difference between the first fluid and the second fluid may be reduced. A volume occupied by the first fluid may be compressed by moving a compensating member. The volume occupied by the first fluid may be expanded by moving the compensating member.
摘要:
Methods of procuring a core sample may involve engaging an earth formation with a cutting structure of a coring bit. A core sample may be received within a receptacle connected to the coring bit, the receptacle being lined with a sponge material. A space of about 1 mm or less may be maintained between the core sample and the sponge material. Coring tools may include a coring bit comprising an inner gage and an outer gage and a sponge material positioned to at least partially surround a core sample cut by the coring bit. A radial distance between an inner surface of the sponge material and the inner gage of the coring bit may be about 1 mm or less. A distance between a center of curvature of the inner gage and a center of curvature of the outer gage may be about 0.3 mm or less.
摘要:
A sampling tool to sample core samples from a wellbore is disclosed. A core sampling storage module includes a pressure housing to store a plurality of core samples, a core tube within the pressure housing, the core tube to store a plurality of core samples drilled from a downhole formation, a pressure housing cover that is configured to be selectively rotated to an open position or a closed position, an activation mechanism to receive a command, and based on the command, open or close the pressure housing cover, a push rod to selectively install a plug to cover the core tube, wherein when the plug is installed the pressure housing maintains a pressure.
摘要:
A pressure coring apparatus comprises a housing having an upper end and a lower end. A valve is coupled to the lower end of the housing and has an open position for entrance of a core and a closed position for retaining and sealing the core within the housing. A piston assembly is moveably disposed within the housing. A first volume is defined within the housing and between the upper end of the housing and the piston assembly. A second volume is defined within the housing between the lower end of the housing and the piston assembly. A pressure relief device is disposed through the housing and operable to maintain pressure within the first volume and the second volume below a target pressure.
摘要:
A selectively operable downhole valve for use with core sampling apparatus, the valve comprising a throughbore through which a first body may pass, and an obstructing member which is capable of selectively obturating the throughbore, the obstructing member being arranged to open or close the throughbore by movement of the first body with respect to the valve. A core sample of the formation may then be obtained and retrieved from the bore under pressure since the valve seals the bore downhole. Retrieving the sample under pressure maintains the integrity of the core sample so that subsequent analysis of the sample will more closely reflect the true characteristics of the formation.
摘要:
The present invention relates to an apparatus and method for recovering a sample from a subterranean formation. The apparatus comprises a receptacle for receiving a sample and at least two seal assemblies disposed on an inner surface of the receptacle. The seal assemblies can be arranged to allow a portion of the sample therethrough during the sampling process and to retain fluids within the receptacle during recovery of the sample. The seal assemblies can comprise at least one seal. The at least one seal can be provided with at least one fluid pocket configured to change shape as the volume of fluid therein alters in response to a pressure differential. A plurality of pairs of seal assemblies can be spaced along the length of the inner surface of the receptacle.
摘要:
Disclosed herein are a crustal core sampler, by which a crustal core sample can be cored in a state coated with a flow-able coating material free of any contamination, and a method of coring a core sample using this crustal core sampler. The crustal core sampler comprises a drilling mechanism and a barrel, wherein the barrel is equipped with a flow-able coating material-ejecting mechanism, and a columnar crustal core portion is coated with a flow-able coating material. Alternatively, the crustal core sampler is constructed by a drill pipe and an inner barrel, wherein the inner barrel is equipped with an inner barrel body, a core elevator, a channel-forming member for forming a flow-able coating material-running channel and flow-able coating material-ejecting openings, and a columnar crustal core portion is coated with a flow-able coating material.
摘要:
The invention provides a method of taking a crustal core sample, wherein the crustal core sample is obtained in a state coated with antimicrobial polymeric gel formed of a polymer and an inorganic antimicrobial agent dispersed in the polymer. It is preferred that the inorganic antimicrobial agent is a compound containing at least one of silver, zinc, copper and ions thereof, the inorganic antimicrobial agent is carried onto a carrier material, the polymer forming the antimicrobial polymeric gel contains a hydrophilic group, and the antimicrobial polymeric gel contains the inorganic antimicrobial agent in a proportion of 0.0001 to 10.0 mass %. Antimicrobial polymeric gel and powdered gel material suitable for use in taking crustal core sample, comprising a polymeric substance and an inorganic antimicrobial agent dispersed in the polymeric substance, the gel is used for coating the crustal core sample upon the taking by drilling the crust.