China National Petroleum Corporation

Cnpc USA Corporation

Beijing Huamei Inc.

Cnpc Engineering Technology R&d Company Limited

Fuxiang Hou

Xin Zhang

Chen Wang

Guodong Zhan

Xu Zhao

Jiaqing Yu

Chris X Cheng

Xiongwen Yang

Yanping Zhang

Tao Jia

Yong Luo

Jianhua Guo

Mingjie Lv

Binggui Xu

Zhitong Liu

Hongwei Yin

Yongliang Yu

Huijuan Guo

Kevin Waddell

Fei Han

Jianli Wang

Quanli Zhang

Yingjie Zhu

Wanjun Li

Jinjun Wang

Depei Shi

Zhijian Hu

Ming Yi

Tito Zabala

Hems Mada

The present invention is a hydraulic control apparatus that activates and deactivates a downhole tool, such as a reamer, at a desired downhole location in a borehole. The apparatus includes a piston, a housing, a coil spring, and a guide pin. The piston has a cam portion with a continuous slotted groove. There is a slide member and a force member within the slotted groove so that the piston moves longitudinally and rotationally within the housing according to the guide pin within the slotted groove. At the desired downhole location, drilling fluid pressure passes a pressure threshold to move a front outlet of the piston to an opened position past an end of the housing, while rotating the piston according to the slide member and force member in the slotted groove. The apparatus alternately extends and retracts the reamer by opening and closing the front outlet by hydraulic control.

Hydraulic control apparatus and method for a downhole tool

Disclosed are an expansion tool assembly, comprising: an expandable tubular; a guide shoe partially inserted into and connected to the lower end of the expandable tubular; a sealing sleeve arranged in the expandable tubular and connected to the upper end of the guide shoe; an expansion assembly comprising an expansion cone and expansion seat disposed inside the expandable tubular, wherein the lower end of the expansion seat is connected with hooks, which can be rested on the upper end of the sealing sleeve; an upper joint that is connected to the upper end of the expansion seat and can be connected to a drill string. A force transfer path can be established via connection between the expansion seat and sealing sleeve, so that expandable tubular weight is borne on the drill string. Unintentional expansion of the expandable tubular, caused by interaction between expandable tubular and expansion cone, can be avoided.

Expansion tool assembly for expandable tubular

Growing community of inventors

Beijing, China

Fuxiang Hou