Southwest Petroleum University

University of Electronic Science and Technology of China

Xu Yang

Gao Li

Hongtao Li

Jun Jiang

Pan Fang

Ce Zhu

Dong Xiao

Hongwei Guo

Lei Luo

Yongjie Li

Wenhe Xia

Linbo Qing

Jin Du

Jingjing Hou

Yangyang Xu

Guo Liu

A low-complexity panoramic video coding method considering distortion temporal propagation is provided. By analyzing the inter-frame reference relationships under the random access coding structure and establishing the corresponding distortion propagation chain, the method utilizes distortion impact factors of coding units to adjust encoding parameters, thereby optimizing the encoding process. Furthermore, the method addresses the issue of oversampling arising from the varying geometric deformations in different latitude regions during the projection of spherical images in panoramic videos. This is achieved by adjusting coding parameters based on the ratio of area changes at different latitudes. The proposed approach significantly enhances coding performance.

Low-complexity panoramic video coding method considering distortion temporal propagation

The present invention discloses an active intelligent wellbore pressure control system, which includes a ground multi-parameter online monitoring system (), a rotary blowout preventer (), a wellhead back pressure compensation manifold, an automatic plugging material filling device (), a drilling device, an MPD intelligent control system (), a remote monitoring and control system (), and a high-precision hydraulic calculation system (). The present invention provides a wellbore pressure control thought of 'plugging and control integration', improves the pressure resistance of a formation by circularly plugging while drilling, realizes active control of a wellbore pressure, effectively broadens a “drilling safety density window” of the formation, reduces the requirements on the pressure control precision of a wellbore pressure control device, solves the problem that a conventional MPD technology cannot deal with the situation that the “drilling safety density window” of the formation is extremely narrow or even zero, and expands the application range of the MPD technology.

Active intelligent wellbore pressure control system

A controllable downhole drilling and completion tool separating device and their method of use are provided. The device includes an upper mandrel connector, an outer sleeve, a claw clamp sleeve, a claw clamp locking ring, a mandrel sleeve, a lower connector, a piston ring and a pressure bearing ball. The upper end of the lower connector is on the outer side of the upper connector in a sleeving mode. A first annular cavity is between the lower connector and the upper connector. The piston ring is on the outer side of the upper connector in a sleeving mode and located in the first annular cavity. The claw clamp sleeve and the outer sleeve are sequentially arranged on the outer side of the upper connector in a sleeving mode. A second annular cavity is communicated with the first annular cavity and formed between the claw clamp sleeve and the upper connector.

Controllable downhole drilling and completion tool separating device and their method of use

Growing community of inventors

Chengdu, China

Xu Yang