It is especially applied to drilling in formation of low-pressure, low-osmosis, prone-leaking and water sensitivity.
The nitrogen gas application in drilling
Advantages:
(1)It is especially applied to drilling in formation of low-pressure, low-osmosis, prone-leaking and water sensitivity.
(2)It Can enhance the drilling speed and enhance drilling speed to 4 to 6 times than
(3)It has less harm to oil layer, and the gas and oil shows clearly.
(4)With a good ability of carrying detritus, and it is the empirical rule.
(5)It meets the well drilling requirements in the special conditions, such as split or leakage stratum, reservoir voidage stratum of old oil area and frozen zone, etc.
Application in borehole operation:
(1)The nitrogen foam has a low density and high viscosity, and is easy to control and carry. The nitrogen foam are widely used in borehole operations, such as sand washing, well-flushing, liquor drainage, gas lifting, etc.
(2)Realize low pressure or negative pressure circulation to avoid leakage.
(3)Greatly reduce the harm to reservoir.
(4)Take out solid particles and other dirt of bottom hole and tubing & casing wall.
(5)Induce the discharge of dirt in near bore zone, eliminate remove the blocking of producing formation, and induce the oil flow.
Application in Acid Fracture
Application in viscous oil production
(1)Keep the reservoir pressure, extend the handling circle, slow down energy reduction in steam handling layers
(2)Expand the dissolved gas in crude oil, alter the saturation distribution and speed up the discharge of crude oil;
(3)Reduce the interfacial tension and raise the displacement efficiency
(4)Protect the casing, reduce heat loss;
(5)Increase the oil reservoir swept volume, improve the thermal recovery effect
(6)Raise the water recovery rate of handling steam
(7)Increase the profile usage
(8)Increase the energy of flexible air drive.
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