A jet adjustment method for downhole sticking of rotary steerable
A technology of rotary steering and jet adjustment, which is applied in the directions of liquid/gas jet drilling, earthwork drilling, flushing of boreholes, etc. It can solve the problems of unsatisfactory release ability of downhole equipment and damage to surrounding cuttings beds, etc., and achieves a simple structure , The effect of strong card-solving ability
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Embodiment 1
[0030] As a preferred embodiment of the present invention, with reference to the attached figure 1 , this example discloses:
[0031] A jet regulating method for downhole jamming of rotary steering, comprising the following steps:
[0032] The ground control system determines the jet hole 2 diversion ratio p according to the cuttings bed cleaning requirements; and sends the jet hole 2 diversion ratio p to the control unit of the downhole rotary steerable system;
[0033] The control unit of the downhole rotary steerable system determines the opening area s of the jet hole 2 according to the definite split ratio p of the jet hole 2 and the equivalent flow channel area S of the drilling tool; the calculation formula is: s=p*S / (1-p) The control unit of the downhole rotary steerable system controls the adjustable bypass valve 3 according to the calculated opening area s of the jet hole 2, controls the overlapping area of the fan-shaped hole 9 on the rotor end 7 and the stator e...
Embodiment 2
[0037] As another preferred embodiment of the present invention, with reference to the attached Figure 1-4 , this example discloses:
[0038] A jet regulating method for downhole jamming of rotary steering, comprising the following steps:
[0039]The surface control system specifies the jet hole 2 diversion ratio p according to the cuttings bed cleaning requirements; and sends the jet hole 2 diversion ratio p to the control unit of the downhole rotary steerable system; the control unit of the downhole rotary steerable system The split ratio p of hole 2 and the equivalent flow channel area S of the drilling tool determine the opening area s of the jet hole 2; the calculation formula is: s=p*S / (1-p); the control unit of the downhole rotary steerable system is obtained according to the calculation The opening area s of the jet hole 2 controls the adjustable bypass valve 3, controls the overlapping area of the fan-shaped hole 9 on the rotor end 7 and the stator end 8, and open...
Embodiment 3
[0042] As another preferred embodiment of the present invention, with reference to the attached Figure 1-4 , this example discloses:
[0043] A jet regulating method for downhole jamming of rotary steering, comprising the following steps:
[0044] The surface control system specifies the jet hole 2 diversion ratio p according to the cuttings bed cleaning requirements; and sends the jet hole 2 diversion ratio p to the control unit of the downhole rotary steerable system; the control unit of the downhole rotary steerable system The split ratio p of hole 2 and the equivalent flow channel area S of the drilling tool determine the opening area s of the jet hole 2; the calculation formula is: s=p*S / (1-p); the control unit of the downhole rotary steerable system is obtained according to the calculation The opening area s of the jet hole 2 controls the adjustable bypass valve 3, controls the overlapping area of the fan-shaped hole 9 on the rotor end 7 and the stator end 8, and ope...
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