Patent ID: 8066066

Claim:
A centraliser segment comprising a first collar portion, a second collar portion said collar portions having an inner face and an outer face, the centraliser segment further comprising at least one bow element extending between said first collar portion and said second collar portion to maintain the collar portions in spaced relation to each other, said bow portions being curved between the collar portions to provide an intermediate portion which is in spaced relation from the outer face of the collars, a first connector element provided at one end of each of the collar portions wherein the first connector element comprises a passage formed along the respective collar portion to extend inwardly from the respective end and second connector element provided at the other end of each of the collar portions the second connector element comprising an elongate element which in use is able to be received in the passage to be slidable along the passage, wherein said first connector elements are engagable with said second connector elements of the same or another centraliser segment such that one or more said centraliser segments are able to form a centraliser which in use, is capable of being received around a borehole casing, said first connector element having an adjustment element cooperating with the passage and the elongate member to control the position of the elongate member within the passage, wherein the adjustment element comprises a threaded element rotatably supported adjacent the passage and wherein the elongate member is formed with a set of serrations along at least a portion of its length, the spacing between the serrations conforming to the thread of the threaded element, wherein in use when the elongate member is received in the passage the thread of the threaded member is engaged with the serrations such that rotation of the threaded member causes relative displacement between the passage and the elongate element.