Patent ID: 8251144

Claim:
A downhole tool for cleaning a lined subsurface bore comprising: a body adapted for use within a lined section of the subsurface bore, the body defining a fluid inlet through which fluid may enter the body and a plurality of fluid outlets through which fluid may exit the body and dislodge material from one or more walls of the lined subsurface bore; and a motor driven valve arrangement for selectively varying the percentage by volume of fluid directed from the inlet between at least one of the outlets and at least one other outlet, whereby with the valve arrangement in a first configuration a larger percentage by volume of fluid is directed from the inlet to said at least one of the outlets and a smaller percentage by volume of fluid is directed from the inlet to said at least one other outlet, and with the valve arrangement in a second configuration a smaller percentage by volume of fluid is directed from the inlet to said at least one of the outlets and a larger percentage by volume of fluid is directed from the inlet to said at least one other outlet.