A problem that has existed in oil well drilling operations is the successful placement of competent cement plugs at desired well depths. Repetitive attempts and failures in obtaining good cement plugs have cost many oil companies a considerable amount of capital both in extra rig time and service company expenses. This problem has recently been investigated with a unique 1/3 scale test model that allows visual observation of cement flow path and behavior of various well fluids during an actual job simulation. Test procedures and results are presented and discussed. Included in the results is a newly developed method which provides for successful plug jobs in severe well conditions. Field results of this method, which are also presented, confirm the results and demonstrate its value in field operations.

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