Sinopec Oilfield Service Corporation

Sinopec Shengli Petroleum Engineering Co., Ltd. Drilling Technology Research Institute

Drilling Technology Research Institute of Sinopec

Yanjun Zhou

Zuohui Li

Hongbing Xiao

Jinzhou Yang

Laiju Han

Haihua Zhang

Peng Zhang

Chengsheng Zheng

Yunbo Xu

Zhijun Tang

Xueqin Wu

Gongrang Li

Hong Zhang

Qiang Lan

A push-the-bit rotary guiding device includes a mandrel having a central passage, a sleeve rotatably sleeved outside the mandrel, a plurality of swing ribs circumferentially arranged in an outer wall of the sleeve with an interval, an actuation mechanism for controlling each swing rib to swing respectively, a plurality of detectors for detecting a distance to a well wall in real-time, and a controller for determining whether the actuation mechanism is required to actuate the swing ribs to swing according to the detected distance. Through a real-time detection of the detectors of the push-the-bit rotary guiding device, a well section having an expanded or reduced diameter is detected in time and guiding of the rotary guiding device herein is avoided. The rotary guiding device has advantages of a simple and compact structure, convenient machining, easy assembling, and a safe and highly-efficient operation, and is easy to be popularized and applied.

Push-the-bit rotary guiding device and application method thereof

The present disclosure discloses a comb polymer or a salt thereof, wherein the structural formula of the comb polymer containing the following constitutional units. When the comb polymer provided in the present disclosure is used in a water-based drilling fluid as a filtration control agent, it can eliminate the defects of conventional filtration control agents which would be subject to ineffectiveness under high temperature and high salinity conditions. The comb polymer has high temperature and salt resistance, and can be produced through simple processes at comparatively low costs. When the comb polymer provided by the present disclosure is used as a filtration control agent, even being added into the drilling fluid at a comparatively low amount, it can still present rather good effects in lowering the amount of filter loss.

Comb polymer, method of preparing the same, and use thereof

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Shandong, China

Yanjun Zhou