Apparatus and method for filtering data influenced by a downhole pump

Abstract

Disclosed is a method for transmitting data from a tool disposed in a borehole penetrating the earth to a receiver. The method includes disposing the tool in a borehole and receiving a series of measurements using a processor disposed at the tool. A telemetry system transmits a latest received measurement that meets acceptance criteria to the receiver after completion of transmission of a previously transmitted measurement.

1 . A method for transmitting data from a tool disposed in a borehole penetrating the earth to a receiver, the method comprising:
 disposing the tool in a borehole using a carrier;   receiving a series of measurements using a processor disposed at the tool; and   transmitting a latest received measurement that meets an acceptance criterion to the receiver after completion of transmission of a previously transmitted measurement using a telemetry system.   
     
     
         2 . The method according to  claim 1 , further comprising storing each measurement in the series of measurements in memory disposed in the tool. 
     
     
         3 . The method according to  claim 1 , further comprising associating each measurement with an acceptance criterion measurement performed by a first sensor. 
     
     
         4 . The method according to  claim 3 , further comprising comparing the acceptance criterion measurement to the acceptance criterion in order to determine if the associated measurement should be transmitted to the receiver. 
     
     
         5 . The method according to  claim 4 , further comprising transmitting the series of measurements from a second sensor disposed at the tool. 
     
     
         6 . The method according to  claim 5 , wherein the second sensor is configured to sense a downhole property of interest. 
     
     
         7 . The method according to  claim 6 , wherein in the downhole property of interest is a formation fluid property. 
     
     
         8 . The method according to  claim 7 , further comprising extracting the formation fluid from an earth formation using a pump. 
     
     
         9 . The method according to  claim 8 , further comprising performing the acceptance criterion measurement on the pump using the first sensor. 
     
     
         10 . The method according to  claim 9 , wherein the acceptance criterion measurement comprises a selection from a group consisting of a pump piston stroke position, a time after a pump piston travel reversal, a pump flow rate, a volume pumped, or some combination thereof. 
     
     
         11 . The method according to  claim 10 , wherein the pump piston stroke position comprises a position approximately half way between two stroke reversing positions. 
     
     
         12 . The method according to  claim 10 , wherein the pump flow rate is approximately constant for a certain amount of time. 
     
     
         13 . The method according to  claim 10 , further comprising separating first measurements associated with a first value of a selected acceptance criterion measurement from second measurements associated with a second value of the selected acceptance criterion measurement. 
     
     
         14 . The method according to  claim 13 , wherein the first value is related to a stable flow rate of fluid through the pump and the second value is related to a flow rate of fluid through the pump that is less than the stable flow rate. 
     
     
         15 . The method according to  claim 14 , further comprising determining the compressibility of the pumped fluid using the first measurements and the second measurements. 
     
     
         16 . The method according to  claim 8 , wherein the pump comprises a piston configured to pump a fluid by displacement, the method further comprising separating first measurements performed when the piston is approximately reversing direction from second measurements performed when the piston is moving and pump inlet pressure is stabilized. 
     
     
         17 . The method according to  claim 16 , further comprising associating a first component of the pumped fluid with the first measurements and a second component of the pumped fluid with the second measurements. 
     
     
         18 . An apparatus for transmitting data from a tool configured to be disposed in a borehole penetrating the earth to a receiver, the apparatus comprising:
 a telemetry system disposed at the tool; and   a processor disposed at the tool and configured to receive a series of measurements and to identify those measurements that are latest received and meet an acceptance criterion for transmission by the telemetry system to the receiver after completion of transmission of a previously transmitted measurement.   
     
     
         19 . The apparatus according to  claim 18 , wherein the processor is further configured to store each measurement in the series of measurements in memory disposed at the tool. 
     
     
         20 . The apparatus according to  claim 18 , further comprising a first sensor configured to provide to the processor an acceptance criteria measurement associated with each measurement in the series of measurements. 
     
     
         21 . The apparatus according to  claim 20 , further comprising a second sensor configured to provide the series of measurements, wherein the measurements are of a downhole property of interest. 
     
     
         22 . The apparatus according to  claim 21 , further comprising a pump configured to extract a formation fluid from an earth formation, wherein the second sensor is further configured to perform a measurement of a property of the extracted formation fluid. 
     
     
         23 . The apparatus according to  claim 22 , wherein the first sensor is coupled to the pump and configured to measure a parameter of the pump. 
     
     
         24 . The apparatus according to  claim 18 , wherein the telemetry system is a mud-pulse telemetry system. 
     
     
         25 . The apparatus according to  claim 18 , wherein the tool is disposed at a carrier configured to be conveyed through the borehole. 
     
     
         26 . The apparatus according to  claim 25 , wherein the carrier comprises at least one of a drill string, coiled tubing, a wireline, and a slickline. 
     
     
         27 . A non-transitory computer-readable medium comprising computer-executable instructions for transmitting data from a tool disposed in a borehole penetrating the earth to a receiver by implementing a method comprising:
 receiving a series of measurements from a sensor disposed in a borehole; and   transmitting a latest received measurement that meets an acceptance criterion to the receiver after completion of transmission of a previously transmitted measurement.