Systems, apparatus and methods for measuring while drilling

Patent · Tue Nov 12 04:00:00 EST 1985

OSTI ID:5845933

Scherbatskov, S A

This invention is concerned with downhole measurements while drilling a borehole in the earth with a drill bit at the lower end of the drill string and transmitting such measurements to the surface. The drilling fluid is forced through a fluid passage which includes a drill string, a bit at the lower end thereof and the annulus surrounding the drill string. There is a restriction in the passage causing a pressure drop creating a high pressure zone and a low pressure zone within said passage, and a drilling fluid bypass comprising a bypass valve provides fluid communication between the high pressure zone and the low pressure zone. By means of a downhole sensor and associated equipment a plurality of pulse or electrical voltage change signals representing downhole information is produced. Each of these signals is arranged to generate several electrical voltage changes. A control means is provided to cause opening of the bypass valve responsive to one of these signals and for causing closing of the valve responsive to another of said signals.

• Assignee: IFI; EDB-86-104032
• Patent Number(s): US 4553226
• OSTI ID: 5845933
• Country of Publication: United States
• Language: English

Related Subjects

440400* -- Well Logging Instrumentation
47 OTHER INSTRUMENTATION
COMMUNICATIONS
CONTROL
CONTROL EQUIPMENT
DATA TRANSMISSION
DESIGN
DRILL BITS
DRILLING EQUIPMENT
ELECTRIC POTENTIAL
EQUIPMENT
FLOW REGULATORS
FLUID MECHANICS
HYDRAULICS
MECHANICS
MWD SYSTEMS
PRESSURE CONTROL
VALVES