Functions of runoff line chokes:
The pressure of the fluid inside the reservoir provides the driving force to push fluids into the well, and in wells with natural flow, to the top of the production pipe to the surface. To maximize the production capacity of each well, the constraints in the runoff line can be minimized.
However, in this case, the production capacity of the system will change continuously depending on any disturbances or instability in the flow within the well. Therefore, most production wells use choke or restriction in the runoff line after the wellhead to create backward pressure on the well.
Applying backpressure near the wellhead may be important for the following reasons:
- Maintain the stability of flow and pressure conditions after throttle.
- Controlling the amount of drawdown on the well, thus reducing the phenomenon of gas cusping or water coning into the well, or the failure of formation around the well.
- Reduce fluctuations in well productivity by applying backward pressure to the system.
- Insulating the well from pressure fluctuations caused by the processing, assembly and transportation systems.
Thus, diphtheria plays an important role in: - Well Control
- Reservoir drain management
Diphtheria Equipment:
Throttles are designed to restrict or throttle flow, so several different designs have been developed. Throttles create a flow restriction by providing a narrow path through which the fluid passes. This restriction can be:
- Fixed:
The diameter of the orifice is determined before installation.
- Adjustable:
The diameter of the hole can be adjusted after installation to suit the well conditions and operating requirements.
The Orifice design can be in one of the following forms:
- Retrievable cylindrical channel with a fixed inner diameter — a fixed choke.
- Valve stem and seat can be adjusted to control effective hole size.
- Two tungsten carbide corsets have flow holes that can be adjusted.
Fixed throttles are especially useful when the specific hole is necessary to monitor well performance, such as during well tests.
The pressure difference through the choke depends on the characteristics of the fluid, the flow rate, and the dimensions of the throttle.