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Cobalt leaching method of cobalt-leached composite acid based on synthetic polycrystalline diamond composite sheet

A technology of polycrystalline diamond and composite acid, which is applied in the field of materials for oil exploration drill bits, can solve problems such as increased internal stress, increased volume, and different thermal expansion coefficients, and achieves the effects of increased resistivity and improved wear resistance

Inactive Publication Date: 2015-04-22
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal expansion coefficient of carbon (artificial diamond) and cobalt is different, and the volume will increase with the increase of temperature during work, which will cause an increase in internal stress and cause damage to the composite sheet.

Method used

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  • Cobalt leaching method of cobalt-leached composite acid based on synthetic polycrystalline diamond composite sheet
  • Cobalt leaching method of cobalt-leached composite acid based on synthetic polycrystalline diamond composite sheet
  • Cobalt leaching method of cobalt-leached composite acid based on synthetic polycrystalline diamond composite sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present invention utilizes compound acid to the efficient decobalt method of artificial polycrystalline diamond composite sheet, comprises the following steps:

[0028] 1) Configure 100ml of oxalic acid solution with a mass concentration of 40g / L;

[0029] 2) 100ml of hydrochloric acid solution with a mass concentration of 15g / L is mixed with the solution obtained in step 1);

[0030] 3) 100ml of hydrofluoric acid solution with a mass concentration of 20g / L is mixed with the solution obtained in step 2) to obtain a composite acid solution;

[0031] 4) Immersing the synthetic polycrystalline diamond composite sheet in the prepared composite acid solution;

[0032] Element

[0033] 5) After preparing the composite acid solution according to the above method, immerse the synthetic polycrystalline diamond composite sheet in the prepared composite acid solution, and keep the temperature at 70° C. for 72 hours.

Embodiment 2

[0035] The present invention utilizes compound acid to the efficient decobalt method of artificial polycrystalline diamond composite sheet, comprises the following steps:

[0036] 1) 100ml of oxalic acid solution with a mass concentration of 50g / L;

[0037] 2) 100ml of sulfuric acid solution with a mass concentration of 18g / L is mixed with the solution obtained in step 1);

[0038] 3) 100ml of boric acid solution with a mass concentration of 22g / L is mixed with the solution obtained in step 2) to obtain a compound acid solution;

[0039] 4) Immersing the synthetic polycrystalline diamond composite sheet in the prepared composite acid solution;

[0040] Element

[0041] 5) Immerse the synthetic polycrystalline diamond composite sheet in the compound acid solution prepared in the above table, and keep the temperature at 80°C for 48 hours.

Embodiment 3

[0043] The present invention utilizes compound acid to the efficient decobalt method of artificial polycrystalline diamond composite sheet, comprises the following steps:

[0044] 1) preparation mass concentration is 100ml of citric acid solution of 50g / L;

[0045] 2) 100ml of hydrochloric acid solution with a mass concentration of 1g / L is mixed with the solution obtained in step 1);

[0046] 3) 100ml of hydrofluoric acid solution with a mass concentration of 15g / L is mixed with the solution obtained in step 2) to obtain a composite acid solution;

[0047] 4) Immersing the synthetic polycrystalline diamond composite sheet in the prepared composite acid solution;

[0048] Element

[0049] 5) After preparing the composite acid solution according to the above method, immerse the artificial polycrystalline diamond composite sheet in the prepared composite acid solution, and keep the temperature at 75° C. for 48 hours.

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Abstract

The invention discloses a cobalt leaching method of a cobalt-leached composite acid based on a synthetic polycrystalline diamond composite sheet. The method comprises the following steps: dissolving an organic acid into distilled water; mixing an inorganic acid 1 with the obtained liquid of the organic acid; mixing an inorganic acid 2 with the liquid obtained from the step 2), so as to prepare the composite acid; and immersing the synthetic polycrystalline diamond composite sheet into the prepared composite acid, and adjusting the dipping temperature to be 25-90 DEG C and the dipping time to be 48-72 hours, so as to prepare the cobalt-leached polycrystalline diamond composite sheet. The abrasive resistance is improved by about 10 times by a test; due to the adopted cobalt leaching method of the composite acid, the metal cobalt in the polycrystalline diamond composite sheet is efficiently and safely removed without pollution; and the cobalt leaching method has the advantages of large cobalt leaching depth, low cost and obvious economic benefits.

Description

technical field [0001] The invention belongs to materials for oil exploration drill bits, in particular to a decobalt removal method based on a decobalt composite acid of an artificial polycrystalline diamond composite sheet. Background technique [0002] PDC drill bits have been widely used in oil exploration at home and abroad, and have played an important role in increasing the drilling speed of extremely soft to medium-hard formations. In particular, they can provide a powerful tool for my country's oil exploration industry to increase drilling speed, shorten drilling cycle, and reduce drilling costs. support. With the increase of deep wells, one of the effective ways to improve the efficiency of the drill bit is to improve the overall performance of the cutting teeth. [0003] The main reason for the decline in the thermal stability of PDC tools is not the oxidation / graphitization reaction of the diamond during the heating process, but the thermal cracks and cracks gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/04
CPCY02P10/20
Inventor 王潜龙
Owner XI'AN PETROLEUM UNIVERSITY
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