Preparation method of fixed perforation rock sample

Abstract

The invention discloses a preparation method of a fixed perforation rock sample. The preparation method comprises the following steps: according to the parameters of fixed perforation on a rock sample, directly obtaining multiple fixed perforation assembly models by a 3D printing machine; fixing the fixed perforation assembly models on the external surface of a steel tube in a well hole; drilling holes in the wall of the well hole along the direction of perforation channels; filling a soluble core material into the perforation channels of the fixed perforation assembly models; after the soluble core material is solidified, disassembling the fixed perforation assembly models; putting the steel tube into a rock sample moulding die, carrying out casting and moulding, performing maintenance under a constant pressure at a constant temperature; and injecting a circulation water detergent into the steel tube to dissolve the soluble core materials in the perforation holes to obtain the rock fixed perforation sample. The included angle between the fixed perforation channels is guaranteed; the included angle between the channels and the axis of the well hole is the same as that of designed scheme so as to satisfy the actual situation of engineering; and the key parameters of perforation channels such as shape, size, distance, and the like can be flexibly set.

Description

technical field [0001] The invention relates to the technical field of physical simulation experiments in the development of oil and gas reservoirs, in particular to a method for preparing rock samples for fixed-surface perforation. Background technique [0002] During the development of oil and gas reservoirs, perforation is the guiding load channel between the wellbore and the reservoir, and as a "finishing step" in exploration and development, it plays an increasingly prominent role in improving the production rate and recovery rate of reserves. The combination of perforation and fracturing of tight reservoirs to obtain higher oil and gas well productivity is the main research direction of new perforation technology today. [0003] Fixed surface perforation is a new well completion measure for hydraulic fracturing of tight reservoirs. Different from the conventional perforating spiral bullet deployment method, fixed-surface perforation adopts clustered bullet deployment,...

AI Technical Summary

Problems solved by technology

The above-mentioned method is expensive and can only be tested directly on site, and it is not operable for the usual laboratory-scale rock samples (side length less than 0.5m), and it is impossible to repeat the experiment, and it is also impossible to achieve accurate perforation on a fixed surface control

[0009] The existing perforation rock mechanics sample preparation method cannot accurately control the parameters such as the angle between the perforation tunnel in the fixed plane, the angle between the tunnel and the wellbore axis, and the tunnel size; and the existing simulated perforation tunnels are all assumed to be cylindrical, and the field Frustum-shaped and other irregular geometric shapes observed in perforation tunnel

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