A kind of core preparation method for oil displacement of tight sandy conglomerate

Abstract

The invention discloses a production method of a rock core for . The method comprises the following steps: 1, mixing quartz sands with a certain particle size, clay mineral and cementing agent powder in proportion; 2, assembling a die; 3, moistening the die: spraying 3 mg of target stratum layer on a lower surface to be in contact with sands by a fine water sprayer before filling the die with the sands; 4, leveling the sands: weighing the above obtained quartz sand mixture accounting for 1 / N of the volume of the die, filling the die with the weighed mixture, moving a leveling tool in the die along a horizontal direction, and pressing the leveled mixture with a press block; 5, stabilizing the pressure of the filled die for 15 min, and releasing the pressure; 6, repeating step 3 to step 5 until the die is full; 7, placing the integral rock core die in an incubator, and baking the integral rock core die; and 8, demolding the die. The large-size compact rock core is produced in the invention, has small dead aperture, optimizes a situation that experiments only dependents on core taking of compact sand rocks and no artificial rock cores exist, and provides help for development of nonconventional oil and gas fields.

Description

technical field [0001] The invention relates to a method for preparing a dense sandy conglomerate core for oil displacement, and belongs to the technical field of artificial core and its preparation. Background technique [0002] The energy exploration reserves of unconventional oil and gas reservoirs (tight sandstone) are huge, which has attracted widespread attention, and its development has also become the main research field of the current topic. Due to the uniqueness of its reservoirs, conventional means cannot produce and develop effectively and efficiently. A reasonable development plan is the basis of oil and gas field development, and necessary / accurate laboratory is the basis of the foundation. Therefore, the basis for laboratory experimental research- Core making to simulate reservoirs is critical. [0003] At present, there are countless studies on core making, but most of them are based on the core making of conventional oil and gas reservoirs. For example, Pro...

AI Technical Summary

Problems solved by technology

The three important parameters that mainly characterize the oil displacement effect / displacement characteristics cannot be effectively displayed at all