Control mechanism

Abstract

The use in a drillstring of a positive displacement motor (PDM) with both an output upwardly and an output downwardly to devices spaced at least by the PDM.

1 - 22 . (canceled) 
     
     
         23 . A dual output positive displacement motor (PDM) comprising:
 (i) a stator surround,   (ii) a single PDM rotor located within the surround;   (iii) a first take-off extending from a first end of the PDM rotor for providing rotational output to a first tool, and   (iv) a second take-off extending from a second end of the PDM rotor for providing rotational output to second tool.   
     
     
         24 . A downhole assembly forming part of a drilstring, or to be part of a drillstring, said assembly comprising or including:
 (i) a stator surround,   (ii) a single positive displacement motor (PDM) rotor located within the surround;   (iii) a first take-off extending from a first end of the PDM rotor for providing rotational output to a first tool, and   (iv) a second take-off extending from a second end of the PDM rotor for providing rotational output to second tool.   
     
     
         25 . The downhole assembly according to  claim 24  wherein:
 the first take-off provides downward rotational output to the first tool, and 
 the second take-off provides upward rotational output to the second tool. 
 
     
     
         26 . The assembly according to  claim 24  as part of a drillstring. 
     
     
         27 . The assembly of  claim 23  wherein the PDM rotor is rotated by fluid flow, the fluid being drilling mud. 
     
     
         28 . The assembly according to  claim 27  wherein a downhole valve is able to attenuate the fluid flow to the PDM rotor and/or through the PDM rotor. 
     
     
         29 . The downhole assembly according to  claim 24  wherein:
 the first tool is a vibratory tool or a rotary tool, and 
 the second tool is a vibratory tool. 
 
     
     
         30 . The assembly of  claim 29  wherein the vibratory tool relies upon interacting magnets to generate vibration. 
     
     
         31 . The assembly of  claim 29  wherein the vibratory tool does not rely upon interacting magnets to generate vibration. 
     
     
         32 . The assembly of  claim 23  when used in one or more of the following downhole activities:
 drilling 
 milling 
 reaming 
 core drilling 
 scale removal 
 sand control/screen setting 
 cementing. 
 
     
     
         33 . A drillstring assembly having a bit, and having a downfeed in use of drilling mud or other fluid; the assembly
 being wherein at least part of the fluid acts through a single positive displacement motor (PDM) having a single PDM rotor within a stator surround in use to cause rotation of the PDM rotor;   and being further characterised in that the PDM rotor has a first take-off that provides downwardly a rotational output to a first tool downwardly of the PDM rotor, or to the bit and has a second take-off that provides upwardly a rotational output to a second tool upwardly of the PDM rotor.   
     
     
         34 . The drillstring assembly according to  claim 33  wherein at least one of the tools is a vibratory tool or rotary tool. 
     
     
         35 . The drillstring assembly according to  claim 34  wherein one of the tools is a vibratory tool and the other tool is a rotary device or there is an output to the bit. 
     
     
         36 . The drillstring assembly according to  claim 34  wherein the vibratory tool has complementary magnetic arrays and requires a rotational input to create relative rotation between magnetic arrays to generate magnetic array interactions. 
     
     
         37 . The drillstring assembly according to  claim 34  wherein the rotary tool is one or more of: a bit, a core bit, a reamer, a hammer/impacting bit assembly, a reamer, a power generator, a vibratory or hammer device/tool requiring relative rotation. 
     
     
         38 . The drillstring assembly according to  claim 33  when used in one or more of the following downhole activities:
 drilling 
 milling 
 reaming 
 core drilling 
 scale removal 
 sand control/screen setting 
 cementing. 
 
     
     
         39 . The use in a drillstring of a positive displacement motor (PDM) device as claimed in  claim 23 , provided as a single unit, to have both an output upwardly and an output downwardly rotating as a consequence of the fluid driven drive of the PDM device and thereby providing a drive each to one of two (or both) devices spaced at least by the PDM. 
     
     
         40 . The PDM according to  claim 39  wherein the uphole output is for coupling to an in casing device and/or the downhole output is for coupling to an in casing device. 
     
     
         41 . An apparatus having a control mechanism for a fluid to be provided downhole as a pressurised stream, the mechanism allowing pressurised fluid to bypass or not, whether wholly or in part, and whether through or about, a downhole rotary output(s) generator so that it can be treated as turned off or on. 
     
     
         42 . The apparatus of  claim 41  wherein such off/on output(s) is (are) able selectively to rotationally control a downhole axially oscillating device, such a device including a magnetic component that rotates responsive to the selected output and a second magnetic component that is rotationally constrained and is forced to oscillate. 
     
     
         43 . A control mechanism that works in conjunction with downhole tools which generate rotary output(s) as a result of a pressurised drilling fluid input whereby; the control mechanism allows pressurised fluid to bypass (or not) through the rotary generation tool so that the tool is able to be turned off or on, such a device is then able to rotationally activate a downhole axially oscillating device, such a device including a cam/wobble plate or other, a compliant member that transmits rotational torque and controls an axially oscillating mass in both compression and tension.