Method for manufacturing mud rock sample by adopting white oil as refrigerant

Abstract

The invention relates to a method for manufacturing a mud-rock sample by adopting white oil as a refrigerant. The method is characterized by comprising the steps of (1) drilling a mud rock sample column, namely (a) for mud cock and the mud cock with cracks, using the white oil as the refrigerant, and (b) drilling the mud rock sample column by adopting a common vertical rock sample drilling machine; (2) encapsulating a rock core column, namely (a) taking out the rock core column, putting the rock core column into heated absolute ethyl alcohol, and washing off the white oil on the surface and gaps of the rock core column, (b) sheathing a thermal shrinkable sleeve in time, and (c) baking the rock core column and the thermal shrinkage sleeve on an alcohol lamp simultaneously till the rock core column is tightly fastened by the thermal shrinkable sleeve; and (3) cutting a sample according to the permeability, namely (a) cutting the overlong rock core column of the mud rock and the thermal shrinkable sleeve on an end-surface cutting machine, wherein consistent length and permeability are required. The method has the advantages that the success rate of the sample can be increased, the rock core sample meeting the requirements can be processed, the environment-friendly effect is achieved and the labor efficiency is high.

Description

Technical field [0001] The present invention involves a mud rock sample treatment method in the field of oilfield exploration technology, which specifically involves a white oil as a refrigerant to prepare mud rock samples. Background technique [0002] At present, with the expansion of the field of oil field exploration technology, mud rocks are used as a key research object, and the physical nature of mud rocks is urgently needed to clarify the material nature of the mud rocks, especially the problem of mud rock drilling rock heart sample testing rate that scientific researchers focus onIn the past, tap water or salt water was used as a coolant to process mudst samples. However, because the heart of mud, it would expand and erode effect after seeing the water, which crushed the mud rock samples and could not process the required rock heart samples.At present, there are four methods for processing mud rock heart samples: 1. Callery drilling method. When drilling mud and rock sam...

AI Technical Summary

Problems solved by technology

[0002] At present, with the expansion of the field of oilfield exploration technology, mudstone is taken as a key research object, and it is urgent to clarify the physical properties of mudstone, especially the problem of permeability measurement of mudstone drilling core samples that researchers focus on has not been well resolved. In the past, tap water or brine was usually used as cooling fluid to process mudstone samples. However, due to the expansion and dissolution of muddy cores after water seepage, the mudstone samples were broken, and it was impossible to process core samples that meet the requirements.

Using kerosene as the coolant has two disadvantages. One is that it is difficult to clean up the kerosene on the sample or in the cracks of the sample, and the other is that kerosene has a certain smell and causes environmental pollution; 2. Liquid nitrogen freezing drilling method, the purpose of using liquid nitrogen is the same as above, The use of liquid nitrogen has two disadvantages. One is that the cost of liquid nitrogen freezing drilling method is very high, and the other is that frozen samples are easy to return to frost and absorb water and cause damage to mudstone samples; Sufficient wind source must be provided; 4. Inverted rock sample drilling mudstone sample method, the disadvantage of this method is that the process is cumbersome, dust pollution is large, and the sample success rate is low