タイトルまたは説明

The Repetitious circulating valve (OMNI Valve) is an annulus pressure operated,recloseable circulating valve. Throughout the operation,the tool is repeatedly cycled up to a predetermined annuluspressure and then released.The Repetitious valve consists of a nitrogen section, an oilsystem, a circulating valve, and a ball valve. The nitrogen sectioncontains the nitrogen gas that counter balances the hydrostaticand annulus pressures. The amount of nitrogen in the tooldepends on well hydrostatic (mud weight and depth) and
downhole temperature. This information must be known toproperly prepare the tool for running in.

Note: With certain completion fluids, the mud weight at thesurface can be significantly different from the actual mud weightdownhole.

The operating and control mechanisms are contained in a closedoil system activated by annulus pressure acting on the nitrogenchamber, allowing an unlimited number of pressure cycles.

The circulating valve and the ball valve work together to keepcirculating pressure off the formation. The ball valve will closebefore the circulating valve opens. The ball valve closes off theworkstring.