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Laboratory staged hydraulic fracturing test method for large-size natural rock

A technology of hydraulic fracturing and test method, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc. It can solve the problems of segmental hydraulic fracturing test failure, large difference in physical and mechanical properties, and poor cementation effect. Achieve the effect of optimizing production increase, good cementation, and avoiding liquid stringing

Active Publication Date: 2016-06-15
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

This method can only carry out staged hydraulic fracturing tests on prefabricated specimens. Since the materials of the prefabricated specimens used are mostly cement and gypsum, which are quite different from the physical and mechanical properties of the rocks in the specific strata fractured on site, the test results There is a big difference from the actual production; in addition, the cementation effect between the prefabricated test piece material and the simulated wellbore is not good, and the test often produces liquid leakage and other phenomena, resulting in the failure of the staged hydraulic fracturing test

Method used

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  • Laboratory staged hydraulic fracturing test method for large-size natural rock
  • Laboratory staged hydraulic fracturing test method for large-size natural rock
  • Laboratory staged hydraulic fracturing test method for large-size natural rock

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Embodiment

[0032] Example: figure 1 It is an overall effect diagram of an embodiment of a laboratory segmented hydraulic fracturing test method for large-scale natural rock blocks according to the present invention; figure 2 for figure 1 The cross-sectional view of the standard test piece after the drilling and grooving is completed in the shown embodiment; image 3 for figure 1 Sectional view of a standard specimen for fixing a fracturing stage liquid injection pipeline in the shown embodiment; Figure 4 for figure 1 Schematic diagram of the partition with holes and the arrangement of holes thereof in the shown embodiment; Figure 5 for figure 1 An exploded view of the grooving tool in the illustrated embodiment.

[0033] A kind of test method for large-scale natural rock block laboratory staged hydraulic fracturing, comprising the following steps:

[0034] 1. Preparation and primary processing of standard test pieces

[0035] According to the physical and mechanical properties...

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Abstract

The invention discloses a laboratory staged hydraulic fracturing test method for large-size natural rock. The method comprises the following steps: 1) selecting natural rock, processing the rock into a standard-size test piece, drilling a hole of desired depth in an end face of the test piece, and cutting multiple ring grooves in the drill-hole, wherein a cavity between the ring grooves is a glue injection cavity; 2) placing a liquid injection pipe at a predetermined ring groove, filling the ring groove with coarse sand, filling the glue injection cavity with glue, sealing two ends of glue with foraminous separator plates until the glue is solidified; 3) repeating the Step 2; 4) placing the standard test piece onto a test rack, connecting the liquid injection pipe, applying three-dimensional confining pressure, and carrying out a staged fracturing test; and 5) unloading three-dimensional confining pressure off the standard test piece, dismounting the liquid injection pipe, and sectioning the standard test piece to observe the internal fracture morphology so as to end the test. The method provided by the invention can be adopted to carry out a staged fracturing test on natural rock under laboratory conditions so as to obtain fracture morphology under experimental conditions.

Description

technical field [0001] The invention belongs to the technical field of hydraulic fracturing simulation tests, in particular to a laboratory segmented hydraulic fracturing test method for large-scale natural rock blocks. Background technique [0002] As a technology to improve the development effect of horizontal wells, staged fracturing of horizontal wells is one of the effective measures to efficiently exploit low permeability reservoirs. Low permeability reservoirs have low permeability, large seepage resistance, and poor connectivity. It is necessary to increase the productivity of a single well by staged fracturing of horizontal wells. Because the wellbore trajectory of horizontal wells is different from that of vertical wells, the formation encountered in horizontal wells is more complicated than that of vertical wells, and the wellbore stress distribution, fracture initiation and extension laws are very different from vertical well fracturing. So far, due to the limit...

Claims

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Application Information

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IPC IPC(8): G01N3/12
CPCG01N3/12
Inventor 张广清王元元聂元训宫傲寒周大伟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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