A method for the recovery of oil or other hydrocarbon deposits from a subterranean formation below a surficial formation, said method comprising the steps of: a) Providing production water, said production water having a first salinity; b) Processing said production water to form an aqueous fluid having a salinity lower than said first salinity; c) Injecting said processed aqueous fluid into the subterranean formation sequentially either prior to and / or subsequent to the injection of a second fluid into said formation; and, d) collecting hydrocarbons displaced by the injected fluids, wherein in said method, said second injected fluid comprises carbon dioxide.

The invention relates to a method and a device for the recovery of hydrocarbons from an oil reservoir. The method comprises the steps of providing production water, injecting the production water into an oil reservoir, and collecting hydrocarbons displaced by the production water from the oil reservoir, wherein the salinity of the production water is lowered prior to or during injection into the oil reservoir by admixing low salinity water having a dissolved salt content lower than the production water.

A flow diverter assembly is described, comprising a structure such as a tree cap adapted to be removably coupled to a Christmas tree; a conduit in the form of a sleeve operatively coupled to said structure; the conduit being adapted to be positioned at least partially within a production passage of said Christmas tree; and a processing apparatus communicating with the conduit to process fluid flow through the production passage.

A christmas tree of an oil or gas well is described, comprising a tree body having a production bore and a lateral branch having a branch bore forming part of a first flowpath to and from the production bore, a choke body disposed on the lateral branch, the choke body having a choke bore communicating with the branch bore to form a part of the first flowpath or a second flowpath with an export line; and a diverter having an internal passage, a part of the diverter being locatable in a diverter bore either in the lateral branch or choke body, the internal passage communicating with either the first or second flowpaths via the diverter bore.

A diverter assembly is described for a production tree, comprising a wing branch extending from the tree having a first bore aligned with the lateral production port and a second bore extending from the first bore, the wing branch comprising a production wing valve located between the body of the tree and the second bore; and a choke disposed on an end of the wing branch. The second bore can communicate with a processing apparatus such as a pump, and typically receives seal bearing insert with an internal passage to seal within the wing branch.

A diverter assembly is described disposed on a lateral branch of a tree to access flow, the lateral branch having a lateral branch bore communicating with a tree production bore and an outlet connected to an export line with an export line bore. A choke body is disposed on the lateral branch of the tree between the tree production bore and export line bore, the choke body having a lateral branch passage in fluid communication in use with the lateral branch bore and tree production bore; an export line passage in fluid communication in use with the export line bore; and a choke insert passage adapted to receive a choke insert of a choke. The choke insert passage forms a fluid flow path to flow fluids through the choke insert passage into or from either the lateral branch passage or the export line passage.

Es wird ein Verfahren zum Einbringen eines Treibgases in Böden beschrieben, wobei dem Treibgas ein oberhalb des Bodens bzw. der Erdoberfläche analysierbares Spurengas zugesetzt wird.

Erfindungsgemäß wird als Spurengas Wasserstoff verwendet. Hierbei beträgt der Anteil des Spurengases Wasserstoff an dem Treibgas-Spurengas-Gemisch maximal 10 Vol-%, vorzugsweise maximal 5 Vol-%.