A diverter assembly is disclosed adapted to be connected to a choke body disposed between a lateral branch of a Christmas tree and an export line. The diverter assembly comprises a housing comprising an internal passage and a processing apparatus communicating with the internal passage. The housing is mountable to the choke body to allow flow between the choke body and the processing apparatus through the internal passage.

A method of producing crude oil, comprising:

a) drilling a well (1) traversing a crude oil containing formation (2);

b) creating a cavity (8) in the vicinity of the well;

c) creating a flow channel (3A,3B) between the cavity and the well;

d) inducing crude oil (20) to flow from the crude oil containing formation into the cavern the flow channel a section of the well, which is equipped with a valve (13);

e) closing the valve when a substantial portion of the cavity is filled with crude oil;

f) injecting water into the cavity, thereby inducing crude oil to flow from the cavity via the flow channel and the well to a wellhead (15) at the earth surface;

g) interrupting water injection into the cavity when a substantial portion of the cavity is filled with water;

h) pumping water from the cavity and filling at least a substantial portion of the cavity with a gaseous fluid;

i) opening the valve and repeating steps d)-h).

The method may make use of a one way valve (13) nitrogen and a salt layer (4).

A diverter assembly (502) used with a manifold of an oil or gas well is described. The diverter assembly (502) comprises a housing (504) having an internal passage (508) having first and second ports. The manifold has a choke body (500), which, in a first configuration, forms part of a first flowpath (10, 500, 530) to and from a bore of the manifold. The first port of the internal passage is connected to the choke body (500) and the second port of the internal passage is connected to a conduit to provide an alternative flowpath (10, 500, 520, 544) to/from a bore of the manifold via the diverter assembly (502). A method of diverting fluids is also described.

The invention relates to oil and natural gas production and can be used for recovering hydrocarbons from hydrocarbon-bearing formations, for example, from oil-bearing formations, or, for example, from gas-condensate reservoirs. A method for recovery of hydrocarbons from a hydrocarbon-bearing formation, comprises: recovering a hydrocarbon-containing fluid through at least one production well, separating at least a part of a gaseous mixture from the fluid, injecting a gas through injection well. The separated gaseous mixture (all or a part of it) is combusted with air, which is used as oxidant, in a power plant, and, exhaust gases resulting from said combustion, which comprise nitrogen and carbon dioxide, are discharged from the power plant. Said air and the separated gaseous mixture are mixed and a gas-air mixture resulting from said mixing is compressed prior to said combustion, or the gas-air mixture is ignited during said compression. In the alternative embodiment of the invented method said air and the separated gaseous mixture are compressed and then are mixed to produce the gas-air mixture prior to said combustion, or the gas-air mixture is ignited, as soon as it is mixed. In both embodiments of the invented method the exhaust gases are compressed and used as an injection gas.

The invention relates to method for producing hydrocarbons from a multilayer system, and an apparatus for use in such a method. The multilayer system comprises at least one high permeable layer and at least one low permeable layer, wherein the high permeable layer is adjacent to the low permeable layer, wherein a first injectant is injected into the high permeable layer and simultaneously a second injectant is injected into the low permeable layer, wherein oil replaced by the first and second injectants from the high and low permeable layers is collected, wherein the rate of injection of injectants for the high and low permeable layers is monitored and adjusted to keep the fronts of displacement of oil from the high and low permeable layers within predetermined limits.