Method for machining plunger-shaped core of brittle fragile rock sample through linear cutting technology
A technology of processing brittleness and wire cutting, which is applied in the petroleum field, can solve the problems of low success rate, large vibration, and processing induced fractures of shale plug-shaped cores, etc., and achieve the goal of overcoming easy bedding fractures, high success rate, and not easy to break Effect
Inactive Publication Date: 2016-05-11
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
In this case, the success rate of obtaining shale plug-shaped cores by the drilling method is low, and neither dry drilling with a drilling machine nor drilling with a water cooling device can obtain plug-shaped cores that meet the experimental requirements. Vibration is large, which can easily cause shale bedding fracture or loosening, and can easily cause processing-induced fractures; drilling with a drilling machine equipped with a water cooling device can easily cause shale to hydrate and disintegrate when exposed to water; It is easy to cause fluid expansion inside the rock sample, destroy the pore structure of the rock sample, and affect the physical parameters of the reservoir
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[0023] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.
[0024] The method for processing brittle and fragile rock sample plunger cores by wire cutting technology of the present invention uses diamond wire as a cutting tool, as shown in the attached figure 1 As shown, the diamond wire is composed of steel wire and corundum, and the surface of the steel wire is coated with a uniform corundum coating, and the particle size of the corundum is 80 mesh. The diameter of the standard diamond wire coated with corundum is 1.2mm, and the diameter of the part without corundum is 1mm.
[0025] The wire cutting method utilizes the up and down high-speed reciprocating motion of the diamond wire, the high-speed self-rotation of the diamond wire and the high-speed grinding of the rock surface. figure 2 shown. Since the corundum on the surface of the diamond wir...
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The invention discloses a method for machining a plunger-shaped core of a brittle fragile rock sample through a linear cutting technology. The vertical high-speed reciprocating motion of a diamond line, high-speed self rotation of the diamond line and high-speed grinding of the surface of a rock sample are utilized, and in the linear cutting machining process, although the longitudinal reciprocating motion speed of the diamond line is very fast, the rock sample in contact with the surface of the diamond line is very slow in longitudinal and transverse pushing speed; meanwhile, the contact area between the diamond line and the rock sample is small, and therefore vibration to the rock sample is small, and the rock sample is not prone to breaking and crushing; and finally, the complete plunger-shaped rock core is easily obtained, and the powerful support is provided for testing researches of a physical experiment of rock.
Description
technical field [0001] The invention relates to a method for processing rock plug-shaped cores in the petroleum field, in particular to a method for processing brittle and brittle rock sample plug-shaped cores by wire cutting technology. Background technique [0002] In petroleum geological exploration and development research, experimental technology is the foundation. Formation rocks have different properties such as electrical properties, elasticity, permeability, and diffusivity. To obtain various parameters required in research, it is necessary to conduct experimental tests on formation rock samples. During the experiment, it is necessary to obtain plug-shaped core samples of various specifications on the formation rock samples. The plug-shaped cores used in previous experiments were mainly obtained by drilling. It is feasible to obtain plug-shaped cores from well-bonded rock samples such as sandstone and carbonate rocks by using the drilling method, which is widely us...
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Login to View More IPC IPC(8): B28D1/22G01N1/28
CPCB28D1/22G01N1/286G01N2001/2873
Inventor 李新方朝强唐生荣张永浩刘鹏李兵吴进忠
Owner BC P INC CHINA NAT PETROLEUM CORP