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US 6,263,969 B1Granted
Bypass sub
AssigneeBaker Hughes Incorporated
InventorsCarl W. Stoesz, Gary E. Cooper
Life of this patent
Estimating the term…
Abstract
A bypass sub which will automatically bypass fluid flow in excess of a selected optimal flow rate for a downhole mud motor. A spring biased mandrel within a housing is driven downwardly by increased fluid flow, and driven upwardly by spring force upon decreased fluid flow, to control the alignment of a port in the mandrel with a bypass port in the housing, thereby maintaining a desired rate of fluid flow to the downhole motor.
Claims13
A fluid bypass tool, comprising:
- a tool body;
- a flow control member within said tool body;
- a fluid flow restriction within said flow control member;
- a fluid passage from said upper end of said tool body, through said fluid flow restriction and said flow control member, to said lower end of said tool body;
- a flow control port through a wall of said flow control member below said fluid flow restriction;
- a bypass port through a wall of said tool body, said bypass port being positioned for fluid flow communication with said flow control port when said flow control member is in said lower position;
- and
- a biasing mechanism within said tool body, said biasing mechanism biasing said flow control member toward said upper position against downward force generated by fluid flow through said flow restriction;
- wherein said flow control port is above said bypass port when said flow control member is in said upper position;
- wherein said fluid flow restriction is oriented to generate a downward force on said flow control member proportional to the rate of fluid flow;
- and
- wherein said flow control member is constrained to move said flow control port into alignment with said bypass port with every downward movement of said flow control member.
9 more elements
A fluid bypass tool, comprising:
- a tool body;
- a hollow mandrel within said tool body;
- a nozzle within said mandrel, said nozzle having a selected flow resistance;
- a fluid passage from said upper end of said tool body, through said nozzle and said mandrel, to said lower end of said tool body;
- a mandrel port through a wall of said mandrel below said nozzle;
- a bypass port through a wall of said tool body, said bypass port being positioned for fluid flow communication with said mandrel port when said mandrel is in said lower position;
- and
- a spring mechanism within said tool body, said spring mechanism biasing said mandrel toward said upper position against downward force generated by fluid flow through said nozzle, said spring mechanism having a selected spring constant;
- wherein said mandrel port is above said bypass port when said mandrel is in said upper position, and said mandrel port is in fluid flow communication with said bypass port when said mandrel is in said lower position;
- wherein said nozzle is oriented to generate a downward force on said mandrel proportional to the rate of fluid flow;
- and
- wherein said mandrel is constrained to move said mandrel port into alignment with said bypass port with every downward movement of said mandrel.
9 more elements
Dependencies are inferred from the claim text.