Freely moving oil field assembly for data gathering and or producing an oil well

An oil field assembly for gathering data from an oil well and producing a well having a portion of said assembly self regulating and substantially free for free movement by gravity or the fluids of the well in a tubing string of the well located in a well casing for movement from or to the surface of the well or from or to predetermined down hole positions and for collecting data while freely moving between said surface of said well and said predetermined down hole positions and for collecting downhole data from said well while said substantially freely movable assembly is at said predetermined downhole positions, and for return to the surface of said well and producing said well upon the return of said assembly comprising;

• (a) a traveling piston which is substantially free for free movement solely by gravity or said fluids of the well for movement from or to the surface of the well and from orto predetermined down hole positions for collecting downhole data from said well as said traveling piston moves substantially freely between said surface and predetermined downhole position or positions,
• (b) instrumentation means connected to said traveling piston for gathering data from said well as said travelling piston moves between said surface of said well and said predetermined downhole position or positions,
• (c) a landing housing means located at or near the surface of the well for receiving said traveling piston and for controllably releasing said traveling piston into said tubing string of the well,
• (d) a landing receiving means located at or near the bottom of said tubing string of the well for releasably receiving said traveling piston, and
• (e) a plurality of instrumentation members located at or near said landing housing means for receiving said data gathered by said instrumentation means on said traveling piston.