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Method for making mud rock samples

A sample making and mudstone technology, applied in the preparation of test samples, sampling devices, etc., can solve the problems of high cost, damage to frozen samples, mudstone samples, and large environmental pollution, and achieve low cost, less equipment, and high success rate Effect

Inactive Publication Date: 2014-04-09
PETROCHINA CO LTD +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The use of kerosene as the cooling liquid has two disadvantages. One is that it is difficult to clean 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 the liquid nitrogen cryo-drilling method is very high, and the other is that the frozen sample is easy to return to frost and absorb water and cause damage to the mudstone sample; Sufficient wind source must be provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Drilling of mudstone sample column:

[0020] a. For mudstone with cracks, use 502 glue to fix the mudstone surface;

[0021] b. Using an inverted rock sample drilling machine, place the mudstone on the fixture, and the force direction of the tightening mudstone is perpendicular to the bedding or crack surface of the mudstone to prevent the mudstone from cracking from the bedding or crack surface after being stressed;

[0022] c. Rotate the gear crank handle of the drilling machine to make the mudstone move downwards, and the drilled cuttings will fall freely along the bit wall under gravity, which plays a role of chip removal. The length of the drilled mudstone sample column is controlled so that the penetration can be cut. Rate within the range of sample length: 30-40mm, too long will easily damage the mudstone sample column, and it is also not conducive to chip removal. During the process of drilling the sample column, it does not require any coolant, which is completely...

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Abstract

The invention relates to a method for making mud rock samples. The method is mainly used for solving the problem that existing mud rock is difficult to process a rock core permeability sample. The method is characterized by comprising the following steps: a. drilling a mud rock sample column through a core drilling machine; b. fastening a snap ring with elasticity on the mud rock sample column, fastening the mud core with the mud rock sample column through a bench clamp, cutting the mud core through a hand-held cutting machine until the mud rock sample column drops out; c. removing the snap ring on the mud rock sample column, sleeving a thermal shrinkable sleeve in time, simultaneously roasting the mud rock sample column and the thermal shrinkable sleeve on an alcohol burner until the thermal shrinkable sleeve fastens the mud rock sample column; and d. putting the mud rock sample column and the thermal shrinkable sleeve on an end face cutting machine to cut a 25 mm mud rock sample column to serve as a permeability sample. By adopting the method for making mud rock samples, mud rock samples meeting the requirements can be prepared.

Description

technical field [0001] The invention relates to a method for preparing a rock core sample in the technical field of oil recovery, in particular to a method for preparing a mudstone sample. Background technique [0002] Drilling and coring is expensive per meter of core. It is a rare and valuable geological material. It truly reflects the structural characteristics and mineral composition of the rock formation. If qualified core samples cannot be processed, the rock formation will not be measured. Without the physical parameters, scientific and technical personnel will not be able to conduct stratum research in a targeted manner, and the economic loss will be huge. Generally, rock cores that are not afraid of water often use tap water or brine as cooling fluid to process samples. However, the argillaceous rock core will expand and break immediately after it sees water, and it is impossible to process a rock core sample that meets the requirements. At present, there are thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/08G01N1/28
Inventor 刘誉松冯向东李舰孙永红
Owner PETROCHINA CO LTD
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