| Title | Development of a High Temperature Borehole Fluid Sampler |
|---|---|
| Authors | Nigel Halladay |
| Year | 1997 |
| Conference | Japan International Geothermal Symposium |
| Keywords | |
| Abstract | The objective of the high temperature fluid sampler development programme is to produce a downhole system capable of capturing a very high quality, representative sample of borehole fluid at a maximum temperature of 400°C and to deliver it to the surface for subsequent analysis. Minimal sample alteration and zero contamination are required. The development of the high temperature fluid sampler for the NEDO Development and Production Technology for deep-seated geothermal resources research programme began in 1993 with the frrst prototype tool, rated for 300°C, scheduled for field testing during the summer of 1997. Following these tests the second prototype rated for 400°C will be designed, built and tested. The programme is currently expected to continue through to the year 2000. The development programme has included current state of the art, concept and feasibility assessments. Extensive material corrosion and high temperature seal performance studies and subsystem design studies have been carried out. Several types of sampler have been identified and the controlled displacement sampler ( CDS) method chosen as the one which offers the best potential for the highest quality sample and development at high temper;'!ture. A high temperature CDS sampling tool has been designed and constructed and is ready for downhole testing. This paper presents the developments to date and outlines the sampler design. |