Long-term preservation method for well core

A technology for drilling cores and preservation methods, which is applied in the field of core preservation and long-term preservation of drilling cores, which can solve problems such as difficulty in preservation, and achieve the effects of recovering economic losses, small physical and chemical properties, and considerable economic benefits

Active Publication Date: 2011-02-02
DAQING OILFIELD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to overcome the problem in the background art that the fractured and disintegrated rock cores taken out from the bottom of the well are difficult to cut or difficult to form an integral plane after cutting, resulting in difficulty in pres

Method used

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  • Long-term preservation method for well core
  • Long-term preservation method for well core
  • Long-term preservation method for well core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of casting materials:

[0031] Under normal temperature and pressure, slowly add the cobalt water isooctanoic acid cobalt styrene solution into the container containing crystal glue and stir evenly, the volume ratio of crystal glue and isooctanoate cobalt styrene solution is 100:0.3; slowly add methyl ethyl ketone peroxide Stir the newly prepared crystal glue and cobalt styrene isooctanoate mixed liquid container evenly to obtain a casting material, wherein the volume ratio of crystal glue and cobalt styrene isooctanoate mixed liquid to methyl ethyl ketone peroxide is 100:0.6.

[0032] (2) Implementation process:

[0033] Such as figure 1 As shown, after the butt joint of the core to be preserved is in the original state, it is placed in a polyethylene U-shaped bracket, and the casting material prepared in the above (1) step is slowly poured into the polyethylene U-shaped bracket containing the core 1 In the groove 2, it should not be too fast, and...

Embodiment 2

[0036] (1) Preparation of casting materials:

[0037] Under normal temperature and pressure, slowly add cobalt water cobalt naphthenate into the container containing crystal gel and stir evenly. The volume ratio of crystal gel and cobalt naphthenate is 100:0.4; slowly add methyl ethyl ketone peroxide to the Stir evenly in the crystal glue and cobalt naphthenate mixed liquid container to obtain a casting material, wherein the volume ratio of the crystal glue and cobalt naphthenate mixed liquid to the volume ratio of methyl ethyl ketone peroxide is 100:0.8;

[0038] (2) Implementation process:

[0039] After the core stubble to be preserved is in the original state, put it into a polyethylene U-shaped bracket, and slowly pour the casting material prepared in the above (1) step into the polyethylene U-shaped bracket containing the core. If it is too fast, try to discharge all the air bubbles inside; place the core sample at room temperature for 14 hours after casting, and the ...

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Abstract

The invention relates to a long-term preservation method for a well core, which mainly solves the problem of difficult preservation because a fractured and broken core taken out of a shaft bottom is difficult to cut or difficultly forms the entire plane after being cut. The method is characterized by comprising the following steps of: preparing a casting material; putting the core to be preserved into a U-shaped polyethylene support groove; slowly pouring the casting material into the U-shaped polyethylene support groove filled with the core; and sizing gel at room temperature, cutting the core after solidifying and sizing in a thermostatic drying oven, putting the core into a U-shaped transparent organic glass support groove for secondary casting and smoothing, grinding and polishing the surface of crystal gel in the U-shaped transparent organic glass support groove until the crystal gel is bright and transparent. By the method, the core can be integrally cut, a cut plane is smooth, the original core is preserved permanently and cannot be broken and the core is convenient to observe in all dimensions.

Description

technical field [0001] The invention relates to a method for preserving rock cores in the field of geological drilling and coring, in particular to a long-term preservation method for drilling rock cores. Background technique [0002] In the existing field of geological drilling and coring, after the core is taken out from the bottom of the well and decompressed on the ground, the core is easily broken and disintegrated, and after disintegration, it becomes a massive core with uneven shapes and sizes. At present, it is difficult for the commonly used cutting machine to cut the core longitudinally from the middle position, or it is difficult to form a whole plane after cutting. There are generally two methods for the preservation of this type of core: one is natural storage. The core taken out from the bottom of the well is placed in an open plastic box without any sealing measures, and is exposed to air with temperature and humidity changes for a long time, which increases t...

Claims

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Application Information

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IPC IPC(8): E21B49/00C08F283/01G09B23/40
Inventor 汪忠兴梁万林
Owner DAQING OILFIELD CO LTD
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