Results 61 to 70 of about 1,261 (138)

Influence mechanism of the rubbing of drilling pipe for the stability of hole wall [PDF]

, 2016
The hole wall appears because of the gas drainage of the coal seam, the hole wall is divided for the elastic area and plastic area, according to the elastic mechanics and rock mechanics established borehole wall stress model, caused by gas drilling ...
Chen-xu, L. (LUO), Shi-feng, W. (WANG), Xiao-ming, H. (HAN)   +2 more
core  

Prediction-based control of linear input-delay system subject to state-dependent state delay – Application to suppression of mechanical vibrations in drilling

, 2016
International audienceIn this paper, we consider linear dynamics subject to a distributed state-dependent delay and a pointwise input-delay. We propose a prediction-based controller which exponentially stabilizes the plant. The controller design is based
Bresch-Pietri, Delphine, Di Meglio, Florent   +1 more
core  

Математичне моделювання та параметричні дослідження роботи механічного яса під час ліквідації прихоплень бурильної колони [PDF]

, 2015
На основі розробленої авторами математичної моделі роботи аварійного компонування бурильної колони досліджено основні динамічні характеристики удару механічного яса, що застосовується для ліквідації прихоплень бурильної колони.
Клімковський, А. Р., Левчук, К. Г., Мойсишин, В. М., Шегда, Л. М.   +3 more
core  

Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout. [PDF]

Sensors (Basel), 2021
Li H, Wang R.
europepmc   +1 more source

Design of Key Parameters of Extended Drillpipe

Shiyou jixie
Extended drillpipe is an important drilling tool that uses very few collars. When applied to complex wells （e.g. deep wells and long horizontal wells）， it can effectively reduce operational risks that are possibly induced by failure incidents at ...
Xu Zhaohui, Chang Junyi, Gao Yuan, Fan Jinchao, Liao Maolin   +4 more
doaj  

Drillstring Vibration Analysis in Extended Reach Drilling (ERD) using WELLPLANTM [PDF]

, 2012
Oil and gas industry always aims efficient service with optimal expenses. This final year project, aiming to deal with one of the most important parameters, that has tremendous impact on drilling operations’ time and cost.
MOHAMMED AHMED OMER, MOHAMMED AHMED
core  

Axial Vibration Analysis on Drillstring [PDF]

, 2015
The problem of drill string vibration occurs in drilling operations and it will affect the usage life of drill pipe and drill bits. Three types of vibration, which are axial, lateral and torsional vibrations exist in the drill string.
HOW, KEK JIA
core  

Dynamic Analysis of Stick-Slip and Bit Bounce in Oilwell Drillstring [PDF]

, 2016
Drilling process consisting of drag bits which are used over drilling boreholes concerning generation along with research about oil and gas regularly undergo against caustic vibrations.
A/L ELIYATHAMBY, DHANARAJ
core  

Hybrid Modelling and Optimisation of Oil Well Drillstrings [PDF]

, 2018
The failure of oil well drillstrings due to torsional and longitudinal stresses caused by stick-slip phenomena during the drilling operation causes great expense to industry.
Alkaragoolee, Mohammed Y.A.
core  

Investigation of drillstring vibration reduction tools [PDF]

, 2012
Drilling related problems such as drillstring vibration is an important cause of premature failure of drillstring components and drilling inefficiency. The vibration of drillstring interferes with measurement collected while drilling.
Al Dushaishi, Mohammed Fayez
core   +1 more source