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A vehicle including a platform, a braking and steering system fitted onto the platform including a handle movable along two substantially perpendicular axes to control steering by moving the handle with respect to a first of said axes and to control braking by moving the handle with respect to a sec

A vehicle including a platform, a braking and steering system fitted onto the platform including a handle movable along two substantially perpendicular axes to control steering by moving the handle with respect to a first of said axes and to control braking by moving the handle with respect to a second of said axes, and two guiding wheels mounted on independent pivoting axles connected by a steering rod, the steering rod being connected to an intermediary connecting rod connected to the control handle.

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A vehicle including a platform, a braking and steering system fitted onto the platform including a handle movable along two substantially perpendicular axes to control steering by moving the handle with respect to a first of said axes and to control braking by moving the handle with respect to a sec

A vehicle including a platform, a braking and steering system fitted onto the platform including a handle movable along two substantially perpendicular axes to control steering by moving the handle with respect to a first of said axes and to control braking by moving the handle with respect to a second of said axes, and two guiding wheels mounted on independent pivoting axles connected by a steering rod, the steering rod being connected to an intermediary connecting rod connected to the control handle. rameter value is established using a data resource. 8. A method as defined in claim 7 wherein said data resource comprises information from previously drilled wellbores into a same or similar formation. 9. A method as defined in claim 1 wherein said first formation parameter value is established using a pressure or temperature transducer located at said first subsurface wellbore location. 10. A method as defined in claim 1 wherein said first formation parameter value is measured and recorded in a logging instrument carried by said drill string in said wellbore. 11. A method as defined in claim 1 wherein said measuring system includes a quantitative analysis instrument to measure flow rate of fluids returning to said wellbore surface through said annulus. 12. A method as defined in claim 1 wherein said measuring system includes an ultrasonic gas measurement instrument for measuring a quantity of gas in a fluid returning to said wellbore surface through said annulus. 13. A method as defined in claim 1 wherein said measuring system employs a qualitative analysis instrument for measuring a composition of fluids returning to said wellbore surface through said annulus. 14. A method as defined in claim 11 wherein said qualitative analysis instrument comprises a chromatograph. 15. A method as defined in claim 1 further comprising adding a tracer to fluid injected into the drill string at the wellbore surface to assist in determining a fluid circulation rate through said closed fluid flow system. 16. A method as defined in claim 15 wherein said tracer comprises a neon gas. 17. A method as defined in claim 1 wherein said wellbore is drilled into said formation in overbalanced condition wherein the pressure in said formation is less than the pressure in a bottom of said wellbore. 18. A method as defined in claim 1 wherein said wellbore is drilled into said formation in underbalanced condition wherein the pressure in said formation is greater than the pressure in a bottom of said wellbore. 19. A method as defined in claim 1 wherein measurements from said calibrated measuring system are used to evaluate rate of fluid flow from said formation. 20. A method as defined in claim 1 wherein said calibrated measuring system transmits data representing measurements of temperature and pressure to the wellbore surface. 21. A method as defined in claim 1 wherein said well is constructed as a function of a determined characteristic of said formation. 22. A method as defined in claim 1 wherein a material balance determination is made to relate composition and volume of fluid injected into the well through the drill string with composition and volume of fluid returning to the wellbore surface through the annulus. 23. A method as defined in claim 22 further including separating fluids flowing from said annulus at said wellbore surface into constituent components. 24. A method as defined in claim 1 wherein said first formation parameter value is established using a fluid flow measuring instrument carried by said drill string in said wellbore. 25. A method as defined in claim 24 wherein said fluid flow measuring instrument comprises one or more of an acoustic, electromagnetic or capacitive transducer. 26. A method as defined in claim 24 wherein said fluid flow measuring instrument comprises a drill string carried instrument segment having multiple transducers for measuring variable parameters related to fluid flow through said wellbore. 27. A method as defined in claim 24 wherein said fluid flow measuring instrument comprises a drill string carried instrument segment having a fluid receiving recess defining a measurement containment area and having a measuring transducer for measuring a parameter of fluid contained in said measurement containment area. 28. A method as defined in claim 27 wherein said fluid flow measuring instrument is provided with multiple transducers for measuring a variable parameter related to fluid flow through said wellbore. 29. A me