Auxiliary controlled valve disposed in a drilling string

Details Auxiliary controlled valve disposed in a drilling string Auxiliary controlled valve disposed in a drilling string

E - Fixed Constructions

21

B

255/25

E21B 21/10 (2006.01) E21B 34/06 (2006.01) E21B 47/18 (2006.01)

Patent

CA 1192897

ABSTRACT An auxiliary controlled valve including a valve body (8) displaceable against a valve seat (9) disposed in a drilling string (6) to produce pressure pulses in drilling fluid renders possible a selective closing or opening of a low-resistance transmission section (12) which lies parallel to a main throttle section (10). The valve has a central passage which permits the passage of measuring instruments through the valve regardless of the particular position of a valve body (8). The valve body (8) is largely balanced out with regard to dynamic flow forces so that only a comparatively small actuating force is necessary.

434767

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