Preparation method of cobalt-removed PDC (polycrystalline diamond) composite sheet
A composite sheet and decobalt technology, which is applied in the field of preparation of decobalt PDC composite sheets, can solve the problems of harsh preparation conditions, high equipment requirements, complicated preparation process, etc., and achieves obvious decobalt effect, low equipment requirements and simple preparation process. Effect
Inactive Publication Date: 2015-03-04
SOUTHWEST PETROLEUM UNIV
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[0008] The purpose of the present invention is to provide a preparation method of cobalt-removing PDC composite sheet, which has reliable principle, simple preparation process, low equipment requirements, environmental protection and no pollution, and can effectively solve the preparation process existing in gas decobalt removal and acid elution cobalt removal A series of problems such as complexity, harsh preparation conditions, high requirements for equipment, and environmental pollution
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[0028] A method for preparing a cobalt-free PDC composite sheet, mainly comprising the following steps:
[0029] Preparation of electrolyte;
[0030] Connect the drill tooth and the copper sheet B to the power supply and place them in the electrolyte, so that the PDC layer of the drill tooth is immersed in the electrolyte;
[0031] Turn on the power and set the electrolysis voltage to 0.73-2V for electrolysis.
[0032] Before electrolysis, fix the copper sheet A with the electrode welded on the top of the hard alloy layer through conductive silver paste, and coat the conductive paste around the copper sheet A and the hard alloy layer to ensure that the hard alloy layer is connected with the hard alloy layer. The copper sheets A of the electrodes are in good contact. At the same time, a polytetrafluoroethylene film is coated on the surface of the cemented carbide layer, so that the cemented carbide layer is isolated from the air, and the corrosion of the cemented carbide laye...
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The invention discloses a preparation method of a cobalt-removed PDC (polycrystalline diamond) composite sheet. The method is realized in a manner that drilling teeth are taken as the anode, a copper sheet B is taken as the cathode, cobalt in a PDC layer can be removed by performing electrolysis on the PDC layer of the drilling teeth and the copper sheet B after being placed in an electrolyte solution, and comprises the following specific steps: (1), preparing electrolyte solution, wherein the electrolyte solution is alkaline, the mass ratio of the electrolyte in the electrolyte solution to water is (15-25):500, the electrolyte is one or more of the K2CO3, KOH, Na2CO3, and NaOH; (2), placing the drilling teeth and the copper sheet B in the electrolyte solution after being connected with a power supply to enable the PDC layer and the copper sheet B to be immersed in the electrolyte solution; (3), powering on and setting the electrolytic voltage to be 0.73 to 2 V for electrolysis. The preparation method of the cobalt-removed PDC composite sheet is simple in preparation process, low in requirement for equipment, environment-friendly, free of pollution, can effectively solve series of difficulties like complex preparation process, rigorous preparation condition, high requirement for equipment and environmental pollution existing in gas cobalt removing and acid pickling cobalt removing.
Description
technical field [0001] The invention relates to a preparation process of a cobalt-free PDC drill bit composite sheet for drilling into hard, complex and difficult-drill formations in the field of petroleum exploration and production. Background technique [0002] The field of geological exploration includes the drilling and production of oil, shale gas, natural gas and coalbed methane, as well as the survey of coal field geology, railway and tunnel engineering, etc. In the field of geological exploration, the consumption of drill bits is not less than 50 million per year, among which the consumption of drill bits belonging to hard, broken, complex and difficult-to-drill formations is not less than 20 million, so the market prospect is broad. [0003] The drill teeth of the drill bit are mainly cutting drill teeth and roller cone drill teeth. Roller cone bits are often used for drilling in hard formations due to their excellent anti-wear efficiency. The cutting drill teeth ...
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IPC IPC(8): C25F5/00
Inventor 薛屺范萍张进李松霞
Owner SOUTHWEST PETROLEUM UNIV