This paper was prepared for the Second Annual European Meeting of the Society of Petroleum Engineers of AIME, to be held in London, England, April 2–3, 1973. Permission to copy is restricted to an abstract of not more than 300 words. Illustrations may not be copied. The abstract should contain conspicuous acknowledgment of where and by whom the paper is presented. Publication elsewhere after publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF publication in the JOURNAL OF PETROLEUM TECHNOLOGY or the SOCIETY OF PETROLEUM ENGINEERS JOURNAL is usually granted upon request to the Editor PETROLEUM ENGINEERS JOURNAL is usually granted upon request to the Editor of the appropriate journal provided agreement to give proper credit is made. Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers office. Such discussion may be presented at the above meeting and, with the paper, may be considered for publication in one of the two SPE magazines. Abstract A new test system for floating vessels uses annulus pressure control to operate down-hole valves. A nitrogen-charged test valve senses the change in annulus pressure to provide positive well control at all times. A correction system is included to provide reliable operations over a wide range of pressures and temperatures. A sampling chamber is available with a complete set of accessory tools for safe testing. The results of field testing are included. Introduction A drill stem testing system for floating vessels has been introduced in the rough conditions of the North Sea and has given satisfactory results in this environment. The system uses a Pressure controlled Test Valve known as Pressure controlled Test Valve known as the PCT valve. When pressure is applied to the annulus (in excess of the hydrostatic pressure), the test valve opens. The valve recloses when the pressure is released. This allows the operator to conduct a test with the minimum of pipe manipulation. This avoids the problems of trying to position down-hole tools accurately while the vessel is moving up and down due to wave action. The system includes a complete line of accessory equipment to provide positive well control through redundancy of all valve functions, to ensure that the reservoir can be adequately tested in complete safety. EQUIPMENT AND OPERATION Tool System The heart of the system is the Pressure controlled test (PCT) valve. Pressure controlled test (PCT) valve.
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