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Hydraulic-fracturing physical simulation method for horizontal well provided with spiral jet hole

A technology of hydraulic fracturing and physical simulation, which is applied in earthwork drilling, wellbore/well components, production fluids, etc. It can solve the problem of no explanation of the influence of perforation parameters on hydraulic fracturing, no research impact, and no public physical simulation Methods and other issues

Active Publication Date: 2017-04-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on helical perforation parameters mainly focuses on numerical simulation and physical model experiments. However, the simplified calculation model of numerical simulation cannot effectively reflect the heterogeneity and isotropy between real formations, and the calculation and prediction results There are certain errors, so the indoor physical simulation experiment, as the most intuitive and effective method, has become a popular research method for domestic and foreign researchers.
[0004] The utility model patent with the authorized announcement number CN201627577U discloses a real triaxial drilling plugging simulation evaluation device, which can simulate the triaxial stress in real formations, and is used to study the mechanical mechanism of plugging in fractured formations and porous formations. Provides an effective guarantee, but the patent does not disclose the specific physical simulation method, nor does it explain the influence of different perforation parameters on hydraulic fracturing
The invention patent with application publication number CN104060976A discloses a physical simulation method for staged hydraulic fracturing of perforated wellbore with different well types. This method can select different well types for different reservoirs to conduct hydraulic fracturing simulation experiments. However, this patent only studies the influence of different well types on hydraulic fracturing, but does not study the effect of different perforation parameter combinations on hydraulic fracturing. influences

Method used

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  • Hydraulic-fracturing physical simulation method for horizontal well provided with spiral jet hole
  • Hydraulic-fracturing physical simulation method for horizontal well provided with spiral jet hole
  • Hydraulic-fracturing physical simulation method for horizontal well provided with spiral jet hole

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Effect test

Embodiment 1

[0083] Such as figure 1 , figure 2 and Figure 13 As shown, according to an embodiment of the hydraulic fracturing physical simulation method with spiral perforation horizontal wells of the present invention, the following steps are included in sequence:

[0084] Step 1: process the simulated wellbore 6, and set spiral perforation holes 65 with different parameter combinations on the well wall of the simulated wellbore 6; make spiral perforation tunnels 66, and insert the spiral perforation tunnels 66 into the spiral perforation holes 65;

[0085] Step 2: Process the test piece mold, open a round hole at the center of the bottom surface of the test piece mold, place the wellbore head 61 of the simulated wellbore 6 in the round hole downwards, and now the simulated wellbore 6 is vertically placed in the test piece mold ;

[0086] Step 3: Mix cement and quartz sand, then add water and stir evenly to form a mixture; pour the mixture into the specimen mold, and remove the spec...

Embodiment 2

[0110] Such as image 3 and Figure 4 As shown, according to another embodiment of the hydraulic fracturing physical simulation method for a horizontal well with spiral perforation of the present invention, its process steps, principles and beneficial effects are all the same as those of the first embodiment.

[0111] In this embodiment, the combination of spiral perforation parameters is as follows: the perforation section includes two clusters of spiral perforation holes 65, the number of spiral perforation holes 65 in each cluster is 6, and there are 12 perforations in the perforation section; the first cluster The distance between the last perforation in the spiral perforation 63 and the first perforation in the second cluster of spiral perforation 64 is 20mm, that is, the cluster spacing is 20mm; two adjacent perforations in each cluster of spiral perforation 65 The vertical distance is 1cm, the angle between two adjacent perforations is 60°, that is, the phase is 60°; t...

Embodiment 3

[0114] Such as Figure 5 and Figure 6 As shown, according to another embodiment of the hydraulic fracturing physical simulation method for a horizontal well with spiral perforation of the present invention, its process steps, principles and beneficial effects are all the same as those of the first embodiment.

[0115] In this embodiment, the combination of spiral perforation parameters is as follows: the perforation section includes two clusters of spiral perforation holes 65, the number of spiral perforation holes 65 in each cluster is 6, and there are 12 perforations in the perforation section; the first cluster The distance between the last perforation in the spiral perforation 63 and the first perforation in the second cluster of spiral perforation 64 is 20mm, that is, the cluster spacing is 20mm; two adjacent perforations in each cluster of spiral perforation 65 The vertical distance is 1cm, the angle between two adjacent perforations is 60°, that is, the phase is 60°; ...

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Abstract

The invention relates to a hydraulic-fracturing physical simulation method for a horizontal well provided with a spiral jet hole. The hydraulic-fracturing physical simulation method comprises the following steps that spiral jet hole bodies with different parameter combinations are formed in the well wall of a simulation shaft, and a spiral jet hole duct is inserted into the hole bodies; a round hole is formed in the center position of the bottom surface of a test piece die, and the shaft head of the simulation shaft is downwards placed in the round hole; cement, quartz sand and water are mixed and stirred to form a mixture, the mixture is poured into the test piece die, and thus an artificial rock core test piece is prepared; and the artificial rock core test piece is turned, the shaft head of the simulation shaft is made to face upwards, and then the artificial rock core test piece is placed on a true three-axis hydraulic-fracturing tester for conducting a hydraulic-fracturing physical simulation test. The simulation method accords with the actual fracturing condition, can be used for simulating the hydraulic fracturing conditions of unconventional shale gas and coal bed gas and conventional low-seepage reservoirs, can provide different spiral jet hole parameter combinations, and provides basic data and theoretical support for design of spiral jet hole parameters of field hydraulic fracturing.

Description

technical field [0001] The invention belongs to the technical field of oil and gas reservoir development, in particular to a hydraulic fracturing physical simulation method for a horizontal well with spiral perforation. Background technique [0002] Because low-permeability reservoirs have geological characteristics of low porosity and low permeability, which will make their development difficult and require high development technology, hydraulic fracturing has become an important means to efficiently develop low-permeability reservoirs. Through large-scale hydraulic fracturing operations in the oil field, complex artificial fractures with high conductivity are formed in the low-permeability reservoir, which improves the permeability of the low-permeability reservoir and effectively increases the drainage volume of oil and gas in the reservoir. Improve oil well productivity. Using a wellbore with spiral perforation for hydraulic fracturing can achieve better fracturing effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B43/11
CPCE21B43/11E21B43/26E21B43/267
Inventor 侯冰张儒鑫郭小锋谭鹏吴越陈勉金衍林伯韬卢运虎周舟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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