Oil and gas well equipment, namely, a casing centralizer run on the outside of the casing in order to run casing, liner or sand screens into the wellbore, designed with rollers around the exterior which maintain contact with the casing and the borehole wall to reduce axial drag

'around':32 'axial':47 'borehol':43 'case':8,16,21,40 'central':9 'contact':37 'design':29 'drag':48 'equip':5 'exterior':34 'gas':3 'liner':22 'maintain':36 'name':6 'oil':1 'order':18 'outsid':13 'reduc':46 'roller':31 'run':10,20 'sand':24 'screen':25 'wall':44 'well':4 'wellbor':28

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