Automatic pretreatment device for total organic carbon in shale and working method

Abstract

The invention discloses an automatic pretreatment device for total organic carbon in shale and a working method, and relates to the technical field of sedimentary rock total organic carbon treatment. Comprising a heating oven, a pretreatment device capable of being taken out is arranged in the heating oven in a supporting mode, the pretreatment device comprises a base, a liquid collecting box of a closed structure is installed on the base, and a liquid collecting main pipe is rotationally installed in the middle of the top end of the liquid collecting box through a bearing seat; a plurality of sample positions are arranged on the periphery of the liquid collecting main pipe in an array mode, each sample position corresponds to one crucible support, a rotatable double-end pipe clamp is correspondingly arranged above the water-permeable crucible on each crucible support in a matched mode, and the double-end pipe clamp is provided with a left pipe clamp and a right pipe clamp which are used for clamping the water-permeable crucible on the corresponding crucible support. An elastic sealing layer is arranged on the inner circumference of the left pipe clamp, and a water absorption layer is arranged on the inner circumference of the right pipe clamp. The steps of acid treatment, suction filtration, drying and the like are all integrated and performed in the same device, a crucible does not need to be moved in the middle process, and the stability of a sample and the high efficiency of treatment are guaranteed.

Description

technical field [0001] The invention relates to the technical field of sedimentary rock total organic carbon treatment, in particular to an automatic pretreatment device and a working method for total organic carbon in shale. Background technique [0002] The analysis of organic carbon content in sedimentary rocks is an experimental research method in the basic equipment of oil and gas field geological laboratories at home and abroad. The national standard "GB / T 19145-2003 Determination of Total Organic Carbon in Sedimentary Rock" specifies the instrumental method for the determination of total organic carbon in sedimentary rock. Before the sedimentary rock sample enters the instrument for analysis, acid treatment is required to remove the inorganic carbon in it. The test principle of this standard is to use dilute hydrochloric acid to remove the inorganic carbon in the sample, put the sample in a high-temperature oxygen flow to fully burn it to generate carbon dioxide and d...

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Problems solved by technology

[0003] In the prior art, the rock total organic carbon sample pretreatment device has not realized the automation of the pretreatment process and has not liberated manpower, and there is still a great need for optimization and improvement in terms of improving test efficiency and ensuring data quality. There are the following problems in the pretreatment of the measured samples: 1. The pretreatment process is cumbersome, and the pickling and water washing are repeated many times, which consumes a lot of manpower; 2. The sample pretreatment process consumes nearly 90% of the analysis and testing time, and the real The combustion time of the test on the machine only needs 3-5min / sample, and the operation on the machine can be completed in just over an hour. The overall evaluation of TOC test efficiency is low; Large differences in experience can easily lead to large fluctuations in test data; 4. The bottom of the water-permeable crucible is heated by a heating plate. The water-permeable crucible is a ceramic material with poor thermal conductivity, and it takes a long time to heat up to the target temperature; and Since the heating plate itself is impervious to water, placing it in the lower part of the water-permeable crucible seriously restricts the cleaning efficiency in the cleaning stage, and the overall test quality is not balanced, which eventually leads to problems such as inaccurate data and poor repeatability.

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