Patent ID: 6263969
Filing Date: 2001-07-24
Classification: E21B,Y10T

Abstract:
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; anda 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; andwherein 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.