A downhole flow control device includes a housing, an inlet port, an outlet port and a valve seat surface surrounding the inlet port. A valve plate is mounted within the housing to move between an open position in which the valve plate is separated from the valve seat surface to define a separation flow path therebetween to permit flow in a forward direction from the fluid inlet to the fluid outlet, and a closed position in which the valve plate is engaged with the valve seat surface to close the separation flow path to restrict flow in a reverse direction from the fluid outlet to the fluid inlet. At least one of the valve seat and valve plate defines a geometry to encourage an increase in static pressure of fluid flow in the separation flow path when the valve plate is in the open position.

Excessive water production from oil reservoirs is a main challenge facing the oil and gas industry nowadays. Polymeric gelants have been widely applied to seal the water production zones leading to a more feasible production operation. This disclosure introduces a new inorganic crosslinker that can potentially replace the conventional chromium acetate as crosslinkers for polyacrylamide in low-temperature reservoirs. The developed formulation has the advantage of being more environment-friendly compared to the known-to-be toxic chromium acetate. The formulation has been tested through the whole pH range examining the rheological behavior of the mature gels in the temperature range between 25 to 100° C. While chromium acetate was proven to be sensitive to the presence of sour gases, namely CO.sub.2 and H.sub.2S, due to the inability to produce a stable gel at the acidic conditions, the proposed crosslinkers are more tolerable towards the high acidity. Unlike the conventional crosslinkers, the gelation rate in the proposed system was found to decrease with the increase in pH. The system has a controllable gelation time at pH conditions between 3.5 and 8.5 and is the most stable in the temperature range between 25 to 100° C.

Excessive water production from oil reservoirs is a main challenge facing the oil and gas industry nowadays. Polymeric gelants have been widely applied to seal the water production zones leading to a more feasible production operation. This disclosure introduces a new inorganic crosslinker that can potentially replace the conventional chromium acetate as crosslinkers for polyacrylamide in low-temperature reservoirs. The developed formulation has the advantage of being more environment-friendly compared to the known-to-be toxic chromium acetate. The formulation has been tested through the whole pH range examining the rheological behavior of the mature gels in the temperature range between 25 to 100° C. While chromium acetate was proven to be sensitive to the presence of sour gases, namely CO.sub.2 and H.sub.2S, due to the inability to produce a stable gel at the acidic conditions, the proposed crosslinkers are more tolerable towards the high acidity. Unlike the conventional crosslinkers, the gelation rate in the proposed system was found to decrease with the increase in pH. The system has a controllable gelation time at pH conditions between 3.5 and 8.5 and is the most stable in the temperature range between 25 to 100° C.

A sand screen assembly for a subterranean wellbore includes a base pipe having a central axis and including a flow port extending radially therethrough. The sand screen assembly also includes a screen element disposed about the base pipe and radially spaced from the base pipe to define an annulus radially positioned between the screen element and the base pipe. In addition, the sand screen assembly includes a manifold formed about the based pipe. The flow port is in fluid communication with the manifold and axially overlaps with the manifold. Further, the sand screen assembly includes a phase change material disposed within the manifold. The phase change material is configured to melt at a temperature below a melting temperature of the base pipe and flow into the flow port.

The present invention relates to a method for producing fluids or gases from a horizontal well 10, the method comprising the steps providing a horizontal well 10 having a horizontal production openhole 20, dividing the horizontal production openhole 20 into at least two separate compartments 30, 32 by means of blockers 40, 42, providing for each separate compartment 30, 32 at least one production string 50, 52, and passing fluid or gas 100, 102 from each compartment 30, 32 to the surface 106 via the corresponding production strings 50, 52. The present invention further relates to a fluid or gas production device 1 for horizontal fluid or gas wells.

The present invention relates to a method for producing fluids or gases from a horizontal well 10, the method comprising the steps providing a horizontal well 10 having a horizontal production openhole 20, dividing the horizontal production openhole 20 into at least two separate compartments 30, 32 by means of blockers 40, 42, providing for each separate compartment 30, 32 at least one production string 50, 52, and passing fluid or gas 100, 102 from each compartment 30, 32 to the surface 106 via the corresponding production strings 50, 52. The present invention further relates to a fluid or gas production device 1 for horizontal fluid or gas wells.

A fluid flow control device serving as an inflow port from a fluid reservoir (R) to the interior of a production pipe (S) is in the form of a housing (3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i, 3j, 3k, 3l). The housing has a primary flow path (18) and a secondary flow path (19). The secondary flow path is in fluid communication with a chamber (B) in which is arranged an actuator (5) for a valve device (4), the valve device arranged to open and close the primary flow path. At least one flow restrictor (1,2) is arranged in the secondary flow path, the flow restrictor arranged to provide a pressure to chamber (B) sufficient to actuate the valve to an open position when the fluid flowing through the secondary flow path is oil, and a pressure sufficient to actuate the valve to a closed position when the fluid has a viscosity and/or density less than oil.

A fluid flow control device serving as an inflow port from a fluid reservoir (R) to the interior of a production pipe (S) is in the form of a housing (3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i, 3j, 3k, 3l). The housing has a primary flow path (18) and a secondary flow path (19). The secondary flow path is in fluid communication with a chamber (B) in which is arranged an actuator (5) for a valve device (4), the valve device arranged to open and close the primary flow path. At least one flow restrictor (1,2) is arranged in the secondary flow path, the flow restrictor arranged to provide a pressure to chamber (B) sufficient to actuate the valve to an open position when the fluid flowing through the secondary flow path is oil, and a pressure sufficient to actuate the valve to a closed position when the fluid has a viscosity and/or density less than oil.

The disclosure provides a pressure escape system comprising: an intake port, wherein the intake port receives a downhole fluid; a sliding sleeve, wherein the sliding sleeve comprises fluid ports disposed through a portion of the sliding sleeve that is within a fluid flow path of the downhole fluid travelling from the intake port; a spring, wherein the spring is disposed within a housing and coupled to the sliding sleeve; and one or more exit ports, wherein the one or more exit ports are disposed through the housing and through the sliding sleeve.

The disclosure provides a pressure escape system comprising: an intake port, wherein the intake port receives a downhole fluid; a sliding sleeve, wherein the sliding sleeve comprises fluid ports disposed through a portion of the sliding sleeve that is within a fluid flow path of the downhole fluid travelling from the intake port; a spring, wherein the spring is disposed within a housing and coupled to the sliding sleeve; and one or more exit ports, wherein the one or more exit ports are disposed through the housing and through the sliding sleeve.