氧活化测井在油套分注及工程问题井中的应用

氧活化水流测井是测量井下水流速度的测井方法之一.它利用具有强穿透能力的高能快中子和伽马射线,可穿过油管、套管甚至水泥环测得随水流动的活化氧伽马信号,通过解析测得的伽马时间谱来计算相应的水流速度,并在已知流动截面面积时进一步算出水流量.它的非接触测量能力使它在解决常规生产测井仪难以有效解决的某些特殊问题上独具优势,如油套分注井油管和油套环空中水流量的分别测量、管柱窜漏位置检测、水井封隔器密封性检测、遇阻深度以下单层吸水量的推断等.列举了大港油田在这方面的4个应用实例.

Applications of Oxygen Activation Water Flow Logging in Wells with Separate Injection Through Tubing and Casing and Problematic Completion

Oxygen Activation Water Flow I.ogging is one of logging methods for measuring water flow velocity. Because of the use of high energy neutron and gamma ray with strong penetrability, it is able to detect signals of the active Oxygen moving with water flow through tubing, casing even cement annulus. Based on analysis of time spectrum measured, the water flow velocity is calculated, and then is done the water flux if the flow section area is known. Its non-contact measurement capability causes its advantage in some special problems which are difficult to be solved by conventional production well logging tools, such as separate measurement of water fluxes in tubing and annulus in water injection well through tubing and casing, locating tubing or casing leak and chaanel, checking the packer leak in injection well, estimating the injection rate of a single layer below the depth of obstruction. Four examples of case study on these in Dagang Oilfield are illustrated in this paper.