The Design Of Cement Thickness Measurement For Drilling Shaft Lining

In ruoergai uranium exploration, mainly using uranium grade gamma loggingcalculation and determination of the thickness of the uranium ore body. Ruoergaiuranium deposit belonging to carbon-silica mudstone, of ore-bearing rock forcarbon-containing crystalline limestone and siliceous limestone, silica rock, producingformation rock for metamorphic slate and sandstone. Constructed mainly as a strikefault, produced mainly in the primary fault of clamping of Silica fume in broken rockzone, due to the crushing of the ore-bearing rock strata, resulting in leakage of drillingmud in the process, given in ruoergai uranium deposit drilling a very difficult, need tocement plugging the drill hole. Cement on the gamma-ray absorption effect is boundto bring to log data, so gamma logging data processing to take into account theElimination of cement on the absorption of gamma logging data. Drill steel cased,water, mud and other gamma logging curve data absorption coefficient and correctiontechnology has now matured and cement layer to absorb gamma logging datacorrection is not perfect. To solve this problem, has carried out research on the subject,to address absorption layer thickness of borehole sealing cement, cement and cementon the absorption coefficient gamma absorption correction for log data and otheraspects of the problem.Reference to water and rail bushings to absorb γ logging data correction method.Gamma logging in the casing absorbs water and iron were based on drill hole casingabsorbs water and iron in the thickness of the layer, gamma logging from thecoefficient of water absorption, iron casing found in the table of the correspondingabsorption coefficient and point-by-point correction. The same token, can drill incement absorbing layer thickness, from cement absorption coefficient γ logging tablesfound in the corresponding absorption coefficient of cement, and point-by-pointcorrection. Primary task is to measure drill cement layer thickness. This is the maincontent of this subject, this based on the ultrasonic thickness measurement technology,measurement of wall thickness of cement in wells.Ultrasonic thickness measurement technology is a source of non-contactthickness measurement technology, the technology with easy to use, low cost, high speed, and harmless to the human body for field use and so on. Therefore, ultrasonicthickness measurement is used most frequently at home and abroad, the most widelyused, and the rapid development of a non-destructive thickness measurementtechnology. In industrial production, the use of ultrasound to the thickness of solid orliquid (distance) measurements is very popular, especially in measuring smalldistances, micro-distance (such as thickness, liquid level, roughness), the most widelyused.This based on a principle of ultrasonic thickness, this special design is suitable forlogging, the ultrasonic thickness measurement equipment is used. Through research,made the principle of measurement of wall thickness of cement in wells and programs,according to design out of the circuit, and a large number of experimental studies.From the experimental results, well borehole wall ultrasonic thickness gauge are ableto meet the demands of reality.