Method for testing flow conductivity of self-supported crack in riverfrac treatment

A technology for water fracturing and conductivity, which is applied in the directions of measurement, production of fluids, and earthwork drilling. Feasible, reliable in principle, simple in fabrication and test device structure

Inactive Publication Date: 2011-09-07
NORTHEAST GASOLINEEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a test method for the conductivity of self-supporting fractures in clear water fracturing, which is used for the lack of indoor testing and evaluation methods for the conductivity of self-supporting fractures in clear water fracturing in the current oil and gas field development process

Method used

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  • Method for testing flow conductivity of self-supported crack in riverfrac treatment
  • Method for testing flow conductivity of self-supported crack in riverfrac treatment
  • Method for testing flow conductivity of self-supported crack in riverfrac treatment

Examples

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Embodiment 1

[0041] Firstly, a core specimen conforming to the closed form of the fracture wall surface after clear water fracturing and pressure relief is prepared, and the preparation method is as follows:

[0042] (1) Drill a cylindrical specimen of Φ50×100mm, bake it at a temperature of 105-110°C for 24 hours, and then put it in a desiccator to cool to room temperature.

[0043] (2) Prefabricate scratches 21 orthogonally on the side of the rock core specimen in the direction along the axis and in the direction along the diameter of the end face, to induce the cracks to stretch and rupture along the direction of the scratches, and to obtain a relatively complete crack wall, see image 3 .

[0044] (3) Place the experimental core horizontally on the base of the splitter, adjust the position of the core so that the scratches in the axial direction of the core are directly below the triangular prism-shaped cemented carbide press knife, and the scratches on the end face along the diameter d...

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Abstract

The invention relates to a method for testing flow conductivity of self-supported cracks in riverfrac treatment. The method comprises the steps of: manufacturing a core test piece which satisfy closed state of the crack wall surface after pressure relief return of riverfrac treatment, drilling a phi 50*100 mm cylindrical test piece, enabling the cylindrical test piece to be orthogonal with a pre-formed scratch, splitting the pre-formed scratch to manufacture a tensile fracture type crack wall surface, dislocating the crack wall surface, smoothly grinding the end surface of the core test pieceto obtain a non-proppant non-engaged crack wall surface combination; then testing the flow conductivity of the crack, putting the manufactured core test piece into a core clamping system, simulating formation stress and temperature, setting and sending a control instruction, enabling each system to work and feed back signals, and finally, collecting the test results and calculating the flow conductivity of self-supported crack in the riverfrac treatment. The method in the invention can really reflect the tensile fracture and shear slip process of the riverfrac treatment, and reduce the process to a pressure and temperature environment under the ground to test the flow conductivity; and the test method is achievable.

Description

1. Technical field: [0001] The invention relates to an indoor test and evaluation method for the conductivity of self-supporting fractures in clear water fracturing during oil and gas field development, and specifically relates to a method for testing the conductivity of self-supporting fractures in clear water fracturing. 2. Background technology: [0002] Clear water fracturing refers to the fracturing operation in which drag-reducing agents, active agents, anti-swelling agents, etc. or linear glue are added to clean water as the working fluid in the reconstruction of low-permeability oil and gas reservoirs. Generally, no or a small amount is added to the working fluid Proppant. A large number of field practices have proved that compared with traditional gel fracturing, clear water fracturing can produce better stimulation effects in low-permeability oil and gas reservoirs, and the construction cost is significantly lower than that of traditional gel fracturing. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B43/267
Inventor 李士斌张立刚李浩
Owner NORTHEAST GASOLINEEUM UNIV
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