US 2021/0198950 A1Published application

Dual-speed dual - core enhanced drilling equipment

AssigneesCNPC Chuanqing Drilling Engineering Company Limited, Ccdc Petroleum Drilling & Production Technology Co Ltd

InventorsLIEXIANG HAN, ZUO CHEN, BIN LIU, XIAOFENG YANG, SHENG YU, JIANLIN YAO, GANG ZHOU, MING FENG, SHIMING DONG, KUNPENG YAO, WEICHENG LI, LEI LI, XIAOPING FU, ZHIJUN LYU, WENCAI CHEN, YONG LI

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Abstract

One exemplary embodiment provides a dual-speed dual-core enhanced drilling equipment which comprises an outer cylinder, a downhole power device, a large cutting head and a small cutting head, wherein the large cutting head is provided with a first centerline, a through hole arranged along the first centerline and a first diameter; the outer cylinder is sleeved outside the downhole power device and forms an annular space, and the outer cylinder directly or indirectly connects the upper drill string with the large cutting head so that the large cutting head and the downhole power device can rotate together with the upper drill string; the downhole power device is provided with a power generation section capable of generating power and a rotation output section which penetrates through the through hole to be connected with the small cutting head and provides independent power for the small cutting head, so that the small cutting head revolves around the first centerline under the driving of the upper drill string while rotating under the driving of the downhole power device. The exemplary embodiment can avoid the problem that the linear velocity of the central point of the large cutting head is zero, and is beneficial to improving the drilling speed.

Claims18

Dependent claims

A dual-speed dual-core enhanced drilling equipment comprising a flow dividing device, an outer cylinder, an downhole power device, a righting device, a large cutting head and a small cutting head,

wherein the large cutting head has a first centerline, a through hole disposed along the first centerline, and a first diameter, the small cutting head has a second centerline and a second diameter, the second diameter being smaller than the first diameter, the second centerline being parallel to but not coincident with the first centerline;
the outer cylinder is sleeved outside the downhole power device to form an annular space, a left end of the outer cylinder is connected with an upper drill string through the flow dividing device, and a right end of the outer cylinder is connected with the large cutting head through the righting device, so that the large cutting head can drill under the driving of the upper drill string, and the downhole power device rotates under the driving of the upper drill string;
the downhole power device is provided with a power generation section and a rotation output section, wherein the power generation section can generate power and rotate the rotation output section, and the rotation output section passes through the through hole of the large cutting head and being connected with the small cutting head and can drive the small cutting head to rotate;
the righting device is configured to right the power generation section, the rotation output section, or the small cutting head;
and
the flow dividing device is configured to separate drilling fluid in the upper drill string into a first fluid stream that enters the annular space and lubricates the large cutting head and a second fluid stream that enters the power generation section of the downhole power device.

3 more elements

A dual-speed dual-core enhanced drilling equipment comprising a flow dividing device, an outer cylinder, a downhole power device, a righting device, a large cutting head and a small cutting head,

wherein the large cutting head has a first centerline, a receiving-coupling portion and a hollow cutting portion having a first diameter, the receiving-coupling portion and the hollow cutting portion fixedly coupled to each other along the first centerline, the small cutting head has a second centerline and a second diameter, the receiving-coupling portion has a coupling member and an inner volume cavity disposed along the first centerline, the inner volume cavity being capable of receiving the small cutting head, the second centerline being parallel to but not coincident with the first centerline, the second diameter being smaller than the first diameter;
the outer cylinder is sleeved outside the downhole power device to form an annular space, a left end of the outer cylinder is connected with an upper drill string through the flow dividing device, and a right end of the outer cylinder is connected with the coupling member of the receiving-coupling portion of the large cutting head through the righting device, so that the large cutting head can drill under the driving of the upper drill string, and meanwhile, the downhole power device rotates under the driving of the upper drill string;
the downhole power device is provided with a power generation section and a rotation output section, wherein the power generation section can generate power and rotate the rotation output section, and a right end of the rotation output section enters the inner volume cavity of the receiving-coupling portion of the large cutting head to be connected with the small cutting head and can drive the small cutting head to rotate;
the righting device is configured to right the power generation section, the rotation output section, or the small cutting head;
and
the flow dividing device is configured to separate drilling fluid in the upper drill string into a first fluid stream that enters the annular space and lubricates the large cutting head and a second fluid stream that enters the power generation section of the downhole power device.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/132,397Filed 23 Dec 2020
Priority: CN 201911403401.031 Dec 2019
Published: 1 Jul 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

E21B 10/26
Drill bits: drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
E21B 41/0085
Equipment or details not covered by groups E21B15/00 - E21B40/00: adaptations of electric power generating means for use in boreholes
E21B 4/02
Drives for drilling, used in the borehole: fluid rotary type drives
E21B 7/002
Special methods or apparatus for drilling: drilling with diversely driven shafts extending into the borehole