Touch sensors are crucial in controlling robotic manipulation when a robot interacts with environmental objects. In this study, multilayer flexible touch sensors in the form of an array were developed. The sensors use ink-type conductive flexible adhesives as electrodes which were printed on polyethylene terephthalate (PET) films in a parallel equidistance stripe pattern. Between the two printe...

The operation experience of horizontal segment well in the southern Sichuan area within hard brittle shale layer Longmaxi formation demonstrates that high-density oil-based drilling fluid (HDOF) induced down-hole working condition, which is typically high-temperature, high-pressure and solid-phase-dominant, will directly impact stability wellbore wall. Focusing on bottom-hole osmotic pressure s...

[1] Single-hole hydrogeologic experiments were conducted with a drillstring packer in Integrated Ocean Drilling Program Hole 1301B, which penetrates 318 m into 3.5-Ma upper oceanic basement on the eastern flank of the Juan de Fuca Ridge. Seven constant-rate injection tests were conducted in open hole, with the packer inflated at three depths in the deepest 166 m of the basement section. The pri...

An adaptive liquid lens actuated by a photo-polymer is demonstrated. The lens cell consists of a top glass substrate and a bottom plastic slab with two holes: reservoir hole and lens hole, which are sealed with elastic membranes. A photo-sensitive polymer is attached to the membrane of the reservoir hole. Under blue light irradiation, the polymer is bent which exerts a pressure to regulate the ...

The narrow operating window between pore pressure and fracture pressure makes drilling difficult in some operations. A feasibility study of managed pressure drilling (MPD) is carried out on Iran Darquain oil field. The previous wells drilled in this field showed that mud returns were lost during drilling Gadvan formation. The present work addresses this problem by means of surface back pressure...

Cutting efficiency and quality are very sensitive to gas jet pressure and nozzle standoff distance. Do a high gas pressure and a small standoff distance necessarily give better material removal capability and cutting quality? Simple experiments to measure the mass flow rate were carried out for two types of geometry: a circular hole and a linear cut directly underneath an axisymmetric nozzle. T...

Abstract In order to improve the validity of bottom hole pressure model, and simplify its calculation process, a mathematical model instantaneous for unsteady flow was established by considering crossflow between fractures matrix. Different conditions, including reservoir top has constant pressure, were considered. The basis obtaining is solve diffusivity equation with integration axisymmetric ...