Abstract: Certain viscous oil reservoirs are too deep to be commercially mined but lack an adequate top seal to employ in situ recovery methods such as SAGD. Without an adequate top seal, gases from the reservoir can rise into overlying aquifers and potentially to the surface. While ice-like hydrates would not normally form above the oil reservoir during in situ recovery, an additive can be added to promote hydrate formation. In this way, a hydrate barrier can be formed to act as a top seal to contain these gases.

Abstract: The invention discloses a method of treating a subterranean formation of a well bore, including the steps of providing a first treatment fluid substantially free of macroscopic particulates; pumping the first treatment fluid into the well bore at different pressure rates to determine the maximum matrix rate and the minimum frac rate; subsequently, pumping the first treatment fluid above the minimum frac rate to initiate at least one fracture in the subterranean formation; providing a second treatment fluid comprising a second carrier fluid, a particulate blend including a first amount of particulates having a first average particle size between about 100 and 2000 ?m and a second amount of particulates having a second average particle size between about three and twenty times smaller than the first average particle size, such that a packed volume fraction of the particulate blend exceeds 0.

Abstract: The invention relates to an enhancing oil recovery method by injecting into a subterranean oil formation an aqueous flooding fluid comprising at least one injecting galactomannan polymer substituted by at least one sulfonation agent. The invention also relates to an flooding fluid having better injectivity properties than existing flooding fluids.

Abstract: A method is for conveying bitumen or heavy oil in a deposit is provided. The bitumen or very heavy oil is liquefied by way of an inductive conductor loop as a heater and is led away using an extraction pipe, wherein the conductor loop and the extraction pipe are disposed relative to one another such that the heating and thus extraction of bitumen or very heavy oil is maximized. To this end, one of the conductors of the conductor loop is disposed substantially vertically above the extraction pipe.

Abstract: The present invention relates generally to in situ hydrate control during hydrocarbon production when applying a recovery method utilizing cyclic injection of light hydrocarbon solvents. Hydrate formation is limited by creating an energy reserve within a hydrocarbon reservoir adjacent to the wellbore. A heated solvent is injected during an injection phase of a cyclic solvent dominated recovery process to form a heated region adjacent to the wellbore at the end of an injection cycle. The energy reserve is used to act against the evaporative cooling effect caused by subsequent production and associated depressurization to maintain reservoir conditions outside of hydrate formation conditions. In situ conditions are estimated and injected energy amounts are controlled.

Abstract: The present invention relates to a process for the production of mineral oil from mineral oil deposits with large temperature gradients, in which, for increasing the mineral oil yield, highly permeable regions of the mineral oil formation are blocked by injecting formulations which, after being forced into the deposit, form highly viscous gels under the influence of the deposit temperature. A plurality of portions of the formulation which in each case can form gels at different temperatures and therefore result in very complete blocking of highly permeable regions of the formation are used.

Abstract: Synthesis gas is more effectively produced from the underground gasification of coal from a coal seam when the casing lining is cemented with a cementitious slurry containing a cementitious material, graphite and an aluminum silicate, such as metakaolin. The cementitious slurry of the cement mix sets as a cement sheath at bottomhole static temperatures less than or equal to 65° C. The set cement may withstand extreme dry heat temperatures which are greater than or equal to 800° C.

Abstract: The invention relates to a method for extracting methane from methane hydrates, comprising the following steps: feeding carbon dioxide to the methane hydrate deposits; allowing the carbon dioxide to take effect on the methane hydrate to release methane and store the carbon dioxide as carbon dioxide hydrate; and removing the released methane, characterized in that the fed carbon dioxide is supercritical carbon dioxide.

Abstract: A process for mineral oil production especially Winsor type III microemulsion flooding, in which an aqueous surfactant formulation which comprises at least one nonionic surfactant having 11 to 40 ethoxy units and a hydrophobic radical having 8 to 32 carbon atoms and at least one further surfactant differing therefrom is forced through injection wells into a mineral oil deposit and crude oil is removed from the deposit through production wells.

Abstract: A process for mineral oil production, especially Winsor type III microemulsion flooding, in which an aqueous surfactant formulation which comprises at least one nonionic surfactant having 8 to 30 ethoxy units, which has a polydispersity of from 1.01 to 1.12, and at least one further surfactant is forced through injection wells into a mineral oil deposit and crude oil is removed from the deposit through production wells.

Abstract: The invention provides economically effective methods for hydraulic fracturing a subterranean formation that ensure improvement of the hydraulic fracture conductivity because of forming strong proppant clusters uniformly placed in the fracture throughout its length. One of these methods comprises: a first stage comprising injection of fracturing fluid into a borehole, the fluid containing thickeners to create a fracture in the formation; and a second stage comprising introduction of proppant into the injected fracturing fluid to prevent closure of the created fracture, and further, comprising introducing an agent into the fracturing fluid to provide formation of proppant clusters in the created fracture and channels for flowing formation fluids.

Abstract: A method includes providing a treatment fluid that is a viscous fluid. The viscous fluid may be greater than 0.01 Pa-s, greater than 0.1 Pa-s, and/or a cross-linked polymer based fluid. The method further includes determining a fines migration composition soluble in an aqueous phase of the treatment fluid that is compatible with the treatment fluid, and that interacts to secure fines in an earth formation intersecting a wellbore within a fines reaction time. The method further includes adding an amount of the fines migration composition to the treatment fluid, and treating the earth formation with the treatment fluid. The method includes leaking off a portion of the treatment fluid into the earth formation, and providing a residence time of the leaked off portion of the treatment fluid in the earth formation, where the residence time meets or exceeds the fines reaction time.

Abstract: A method for enhancing oil recovery is disclosed. The method includes providing a subsurface reservoir containing hydrocarbons therewithin and a wellbore in fluid communication with the subsurface reservoir. A solution for injection into the reservoir is formed by mixing a composition with at least one non-ionic chemical, at least one polymer, and at least one alkali. The non-ionic chemical can be alcohol alkoxylates such as alkylaryl alkoxy alcohols or alkyl alkoxy alcohols. The solution is solution is clear and aqueous stable when mixed. The solution is injected through the wellbore into the subsurface reservoir.

Abstract: Disclosed are spacer fluids and methods of use in subterranean formations. Embodiments may include use of consolidating spacer fluids in displacement of drilling fluids from a well bore annulus. Embodiments may include determining the boundary between a cement composition and a consolidating spacer fluid based on presence of tagging material in the well bore.

Abstract: A method for treating a karsted formation containing heavy hydrocarbons and dolomite includes providing heat to at least part of one or more karsted layers in the formation from one or more heaters located in the karsted layers. A temperature in at least one of the karsted layers is allowed to reach a decomposition temperature of dolomite in the formation. The dolomite is allowed to decompose and at least some hydrocarbons are produced from at least one of the karsted layers of the formation.

Abstract: The present invention relates to a process and related apparatus for determining the presence and/or quantity of H2S in the drilling debris of a subsoil layer comprising the following working steps: recovering the drilling debris of a layer; degassing the drilling debris from the previous recovery step, and separating a gaseous phase from said debris; clearing the gas released in the step of degassing, and conveying towards an H2S detector; determining the possible presence and/or quantity of H2S in the gaseous phase from the steps of degassing and clearing by means of a suitable means of detection; possible repetition of the previous phases at two layers, at least of the subsoil at different levels of depth in relation to the surface, with consequent determination of a distribution profile of H2S in the subsoil.

Abstract: A well treatment composition is formed from a fluid mixture of a viscoelastic surfactant and a liquid carrier fluid. The fluid mixture has rheological properties wherein the mixture exhibits shear-thickening behavior when the shear rate is increased from a first shear rate to a second higher shear rate. The fluid mixture may further include a shear activation additive that interacts with the viscoelastic surfactant to facilitate the shear-thickening behavior. The method is accomplished by introducing the fluid mixture into a wellbore formed in a subterranean formation. In certain applications, the fluid mixture may be recycled by bringing the fluid mixture to the surface and reintroducing the fluid into the same or a different wellbore.

Abstract: The present disclosure is directed to a method of servicing a well. The method comprises providing a well servicing fluid. The well servicing fluid is formulated with the following components comprising, at least one friction reducer chosen from polychloroprenes, vinyl acetate polymers, polyalkylene oxides polyalphaolefins; and a nonaqueous carrier fluid. The well servicing fluid is introduced into the well.

Abstract: Disclosed are foamed spacer fluids comprising kiln dust for use in subterranean formations. An embodiment discloses a foamed spacer fluid comprising a partially calcined kiln feed removed from a gas stream comprising SiO2, Al2O3, Fe2O3, CaO, MgO, SO3, Na2O, and K2O; a foaming agent; a gas; and water.

Abstract: A secondary battery having a bare cell and a protective circuit module disposed over the bare cell and electrically connected to the bare cell via a first lead plate, in which the first lead plate includes a first plate, a second plate connected to the first plate, and a third plate arranged opposite to the first plate and connected to the second plate.