Abstract: Improved methods and apparatus are provided for correlatively matching, recording, and displaying, two or more sets of logging data measurements with respect to the borehole depth at which they are generated, and independent of their historical or real-time character. In a particular embodiment of the invention, measurements from each set of data derived or sampled at correlative depths are adjacently displayed in graphical form during a logging operation. The depth offset between the measurements is visually or automatically detected, and in response thereto, the subsequent correlation of other selected measurements and depths at which subsequent measurements are derived are thereby adjusted for further processing, display and recording.

Abstract: An elongated body member, a portion of which forms a chamber for retaining samples of the liquid and steam contents of a geothermal well. A fluid tight seal is formed between an O-ring and a parallel sealing face of a slidable shaft member. The pressure sealing force is adjustably controlled by a spring assembly. The spring assembly is adjusted so that the sealing force must be overcome before a sample is taken. When the sealing force exerted upon the seal is overcome, the sample chamber is placed in fluid communication with the geothermal borehole by a series of passages which include grooves or slots contained in the slidable shaft member. After sampling is complete the seal is reformed allowing the sampler to be retrieved to a surface location.