- Title : Downhole Testing Services by Schlumberger Company
- Publish : Schlumberger 225 Schlumberger Drive Sugar Land, Texas 77478
- Type Document : pdf
- Release : December 2000
- Total Page : 94 Page
- Size : 3.36 Mb
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Decrypted Contents
Flopetrol Johnston–Schlumberger downhole tools history The history of the drillstem test (DST) goes back to 1926, when E. C. and M. O. Johnston developed the first commercial downhole testing tools. The two brothers were working in the oil fields in Arkansas, USA, where local conditions required frequent and expensive formation testing in a cased hole. The first tool developed incorporated a tester valve and a conical packer element (Fig. 3). It was used in openhole, saving the cost of running casing to test. The field tests were successful, and the brothers continued to work on improving the tools.
Many new tools and techniques were introduced by Johnston Testers. The 1930s saw the introduction of water cushions to reduce differential pressure, a straight hole packer that did not require a core hole and pressure recorders to distinguish between a bad well and tool problems.
During the 1940s reverse circulating subs were invented to get recovered oil out of the pipe before tripping out of the hole. In addition to numerous tool improvements in the 1950s, tubing conveyed-perforating was introduced.
Many new tools and techniques were introduced by Johnston Testers. The 1930s saw the introduction of water cushions to reduce differential pressure, a straight hole packer that did not require a core hole and pressure recorders to distinguish between a bad well and tool problems.
During the 1940s reverse circulating subs were invented to get recovered oil out of the pipe before tripping out of the hole. In addition to numerous tool improvements in the 1950s, tubing conveyed-perforating was introduced.
Further developments resulted in the MFE* Multiflow Evaluator system in 1961, the first PCT* Pressure Controlled Tester valve system in 1971, the fullbore PCT system in 1980 and the intelligent IRIS tools in 1992. In 1994 a consortium of 11 clients qualified a full range of tools for hostile HPHT conditions with maximum annulus pressures up to 25,000 psi and temperatures above 400°F [204°C]. Later, a selection of tools with an innovative sealing system was qualified for temperatures up to 500°F [260°C]. The process continues (Fig. 4); the Schlumberger design team liaises with field personnel and clients to develop new downhole tools to further enhance
tthe capabilities of test strings—and thus maintains the tradition started in 1926.
tthe capabilities of test strings—and thus maintains the tradition started in 1926.
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