E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/4
E21B 47/10 (2006.01)
Patent
CA 1059430
TITLE CLOSED SYSTEM FOR TESTING THE CONDITION OF WELL BORE FORMATIONS FOR CEMENTING THE PRODUCTION CASING ABSTRACT OF THE DISCLOSURE In testing the condition of well bore formations as to fluid flow into and out of the surrounding formations and gas emission therefrom prior to cementing a production casing in the well bore, a testing fluid of a preselected density, such as a salt water solution, is pumped from a source through a treating conduit into the production casing positioned in the well bore. The testing fluid is circulated down the production casing and up the annulus between the production casing and well bore formations displacing drilling fluid and other materials therefrom. For an empty well bore the pro- duction casing and annulus are filled with the testing fluid. Samples of the fluids are directed periodically to a gas detector to test for the presence of gas emitted from the formations surrounding the well bore. Once the well bore is flushed clean, the testing fluid is conveyed through a closed circulating system of conduits to a storage vessel. The storage vessel is connected by a suction conduit to the pump that conveys the fluid from the source to the well bore. After a preselected volume of fluid is established in the storage vessel and the testing fluid is circulating through the well bore, flow from the source is terminated and the fluid level in the storage vessel is monitored for a lo-8 of fluid into the formations surrounding the well bore or flow of fluid from the formations into the well bore. - 2 -
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