Downhole power system
a power system and power supply technology, applied in the direction of borehole drives, borehole/well accessories, fluid removal, etc., can solve the problems of inability to provide adequate power, turbines are very quickly destroyed, and wirelines are not always suitable or capable of providing adequate power,
Inactive Publication Date: 2015-10-22
WELLTEC AS
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AI Technical Summary
Benefits of technology
The present invention provides an improved downhole system where pressurized fluid is used for powering a tool downhole consuming a lot of power while being reusable after operation. This eliminates the need for significant repair work. The downhole power system includes a piston that can move to control the flow of fluid and power the tool. The piston has a wall that can cover or uncover the fluid outlet, depending on its movement. This allows for controlled fluid flow and efficient power utilization.
Problems solved by technology
When driving a tool, a wireline is not always suitable or capable of providing adequate power for powering the tool, and thus the pressurised fluid fed down the tubing is used.
The tubing may be connected to a turbine for converting the energy from the pressurised fluid into a mechanical energy; however, tests have shown that the turbines are very quickly destroyed.
Thus, in order for such coiled tubing system to be reusable, substantial repair work often has to be performed.
Method used
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Embodiment Construction
[0073]FIG. 1 shows a downhole power system 1 having a tubing string 2 comprising a pressurised fluid 3 for driving a turbine 4 for converting the energy from the pressurised fluid into rotation of a shaft 5. The shaft is illustrated by dotted lines. The downhole power system 1 further comprises a tool 6 powered by the turbine indirectly through the shaft 5. A constant flow downhole assembly 7 is arranged between the tubing string 2 and the turbine 4 in order to provide a substantially constant flow of the pressurised fluid to the turbine. When pumping fluid down a tubing string, the pressure of the fluid varies significantly due to the fact that it is difficult to maintain a constant pressure output of the pump during a downhole operation since the pump is often manually operated over a long period of time. Turbines have a design which is sensitive to variations in the flow rates and thus to variations in the rotational speed of the shaft. Tests have shown that if the pressure is co...
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The present invention relates to a downhole power system (1) comprising a tubing string (2) comprising a pressurised fluid (3), a turbine (4) for converting energy from the pressurised fluid into rotation of a shaft (5), a tool (6, 6a) powered by the turbine, wherein a constant flow downhole assembly (7) is arranged between the tubing string and the turbine for providing a substantially constant flow of the pressurised fluid to the turbine, wherein the constant flow downhole assembly has an assembly axis (9) and comprises a body (15) comprising a main bore (16) having a bore inlet (17) and at least one bore outlet (18), a hollow piston (19) having a piston inlet (32) and a piston outlet (33), said hollow piston being arranged in the main bore, and a spring (34) arranged in the main bore, said spring being compressed upon movement of the piston in a first direction (35), and wherein the bore inlet is in fluid communication with the piston inlet and the piston inlet is smaller than the bore inlet so as to force the piston to move in the first direction. The present invention also relates to a constant flow downhole assembly and to a method for proving a substantially constant flow of fluid into a turbine of the downhole power system.
Description
FIELD OF THE INVENTION[0001]The present invention relates to a downhole power system, a constant flow downhole assembly and a related method for providing fluid into a turbine of the downhole power system.BACKGROUND ART[0002]Fluid fed down coiled tubing is used for driving a variety of tools or drilling bits. When driving a tool, a wireline is not always suitable or capable of providing adequate power for powering the tool, and thus the pressurised fluid fed down the tubing is used. The tubing may be connected to a turbine for converting the energy from the pressurised fluid into a mechanical energy; however, tests have shown that the turbines are very quickly destroyed. Thus, in order for such coiled tubing system to be reusable, substantial repair work often has to be performed.SUMMARY OF THE INVENTION[0003]It is an object of the present invention to wholly or partly overcome the above disadvantages and drawbacks of the prior art. More specifically, it is an object to provide an i...
Claims
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Login to View More IPC IPC(8): E21B41/00E21B34/10
CPCE21B41/0085E21B41/00E21B34/10E21B4/02
Inventor HALLUNDB K, JORGENLARSEN, STIG SEJR
Owner WELLTEC AS