Gas flow rate measurement

专利名称：Gas flow rate measurement申请号：AU5128598申请日：19971127公开号：AU5128598A公开日：19980622

摘要：Once an oil well has been drilled and is producing, it is desirable to monitor therate at which oil or gas is being delivered. It is particularly useful to know when there is achange in a fluid's output rate, for that can indicate problems with the well. This

monitoring is known as \"production logging\". Prior to the introduction of horizontal welldrilling, most wells were either vertical or only slightly deviated. However, many present-day wells have long horizontal or nearly-horizontal portions, and the techniques used tomeasure flow in vertical wells are not applicable to horizontal wells. Moreover, any flowrate measurement technique to be used downhole should take account not only of theseveral sorts of \"lined\" wells but also the \"barefoot\" ones.The invention seeks to satisfythis need for a technique that can be employed with all these sorts of completed well byutilizing a pair of correlated spaced sensors (that can detect \"directly\" the differencebetween gas and liquid (oil and/or water), which sensor pair is carried on a logging toolpositioned within the borehole itself such that the individual sensors are disposed so asto be actually in the path of any gas bubbles likely to be in the fluid. The correlatedoutput of the sensor pair allows a determination of the gas flow velocity, and if at thesame time measurements are taken that provides an indication of the hold-up of the gasbubbles there may by calculation be determined the flow rate both of the gas and of thefluid.

申请人：SCHLUMBERGER TECHNOLOGY, B.V.

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