bstract Formation evaluation has been grea![y improved by obtaining the data frotn drill-stem testing and a series of logs with one trip its the hole. The log is run imnaediately before and ujter the test. Both gamma ray and. resis:ivi[y curves are recorded down-hole in a seif-contained apparatus. In addition to tite basic information contained in the log itself, the combination with data obtained frotn clrill-wem testing will permit more accurate and complete jormation evaluation. Field examples are presented (O ilhcwrate results obtained with this techniqlie.
The Multi-Flow Evaluator (MFE) is a new system of tools providing an original approach in drill-stem testing. It improves control during the testing operation and gives a more accurate evaluation of the fluid recovered while providing additional pressure information for reservoir analysis. The tools are operated entirely by up and down motion of the drill stem. This up and down operation provides a positive means of control and offers easily observed surface indications of tool operating position. An unlimited number of shut-in and flow periods may be taken with this tool while in the hole. The key to the success of the MFE system of tools is the safety seal packer. Until this development, operation of the tools by up and down motion only had proven unreliable. The success ratio of the MFE now exceeds the ratio achieved by conventional tools. The equipment includes a 2,750-cc chamber in which a representative sample of the flowing formation fluid is trapped at the end of the last flow period and brought to the surface under pressure. The sample can be evaluated at the wellsite or transferred under pressure for laboratory analysis. The sampling feature of the tool allows a sample to be obtained from a reservoir which has suffered minimum influence from production. A representative sample can be obtained for laboratory or empirical analysis by employing a testing technique to minimize drawdown during flow periods. Interpretation methods to take advantage of this additional information are presented and supported by actual field examples. Introduction The Multi-Flow Evaluator (MFE) represents the most recent technical advance in formation testing. Drill-stem testing techniques prior to the MFE have been limited in three areas(1) operation, (2) recovery analysis, and (3) reservoir analysis. The tools in the MFE system allow maximum control during testing and provide test information superior to that obtainable with conventional tools. The system of tools and the operation procedures are described to illustrate the mechanical advantages over present tools. JPT P. 207ˆ
Well testing offshore and in reInote areas such as the Arctic incurs a substantial responsibility to provide cOInplete test results with Inaxi-Inum safety and environmental protection. This paper describes the new developments in a rapidly advancing technology for testing in these high cost operations. Major eInphasis is placed on producing good results to allow Inaking correct decisions in these high investInent wells. The subject Inatter reviews iInportant aspects of both offshore and reInote area well testing. Recent new develop-Inents included are surface instrUIIlentation which Inonitors early downhole flow rate for better engineering of the test, safe provisions for wireline and coil tubing operations, testing with liInited fluid production, and new downhole pressure actuated tools for high flow production type testing. Accessory equipment for wireline operations and future developments are also included.
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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