Core manufacturing method

Abstract

The invention relates to a core manufacturing method, through which cores with fissures can be manufactured, so that characteristics of fissures in an actual oil reservoir can be simulated, and accurate data can be provided for subsequent experimental work. The core manufacturing method comprises the following steps: 1) cleaning cores from a research area for oil removal; 2) trimming the end surfaces of the cores into planes; 3) carrying out saturated oil/water processing on the cores; 4) wrapping the peripheral surfaces of the cores with films for preventing overflow of water/oil from the cores, and exposing the two end surfaces of each core; and 5) applying a pressure in the radial direction of each core on the full length of the core until the fissures appear on the two end surfaces. The core manufacturing method provided by the invention has the advantages that an environment in which fluids flow in pores and fissures of shales and sandstones in actual situations can be simulated,so that accurate experimental data can be provided for oil-gas well production when the manufactured cores are used in experiments.

Description

technical field [0001] The invention relates to a method for making a rock core. Background technique [0002] In recent years, with the continuous exploration and development of oil and gas wells, the proportion of low-permeability oil and gas reserves has been increasing, and low-permeability oil and gas wells will be the main resource for increasing reserves and production for a long time. Due to the low permeability and high start-up pressure of rocks in low-permeability reservoirs, it is necessary to use fracturing to create artificial fractures during the production process. Micro-fractures in low-permeability oil layers can communicate with matrix pores and larger pores in the reservoir. The seepage channel improves the permeability of the matrix and plays an important role in improving the flow state of oil and gas in the formation and increasing the productivity of oil and gas wells. [0003] Since artificial fractures have an important impact on the water flooding...

AI Technical Summary

Problems solved by technology

Physical simulation experiments are an important means of simulating the development of oil and gas reservoirs. For example, in the existing technology, technicians will use the characteristics that the permeability of high-permeability cores is equal to the permeability of fractured shale and sandstone in the reservoir to use High-permeability rock cores are used for simulation tests; steel plates and copper plates with deformed dimensions are also used to produce fractures with known openings, but these methods have certain limitations, and there is a certain gap between them and the fractures in actual reservoir rocks , so the effect is not ideal in guiding oilfield development experiments

[0004] In order to overcome the differences in fractures in actual reservoir rocks, technicians proposed to use cores with fractures directly for simulation experiments in the follow-up research process. The cores used in the experiment process are divided into natural fractures and artificial fractures. Two, because the natural fractured core is difficult to obtain and easily broken, the feasibility of the scheme is not high, so in the current research work, there is an urgent need for a method to produce a core with fractures for technicians to use the core for simulation experiments

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