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Hydrofracture experimental test piece for prefabricating natural crack and manufacture method thereof

A natural fracture and hydraulic fracturing technology, applied in the preparation of test samples, etc., can solve the problems of uncontrollable fracture shape, difficulty in accurately studying the influence of natural fracture fracturing, etc., and achieve the effect of accurate simulation

Inactive Publication Date: 2018-12-21
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the experimental specimens formed by the above two manufacturing methods, the fractures formed are all open, which is inconsistent with the situation that most of the natural fractures are closed or filled under the formation conditions, and the shape of the fractures is uncontrollable, so there is a big gap. Due to limitations, it is difficult to accurately study the influence of natural fracture development on fracturing

Method used

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  • Hydrofracture experimental test piece for prefabricating natural crack and manufacture method thereof
  • Hydrofracture experimental test piece for prefabricating natural crack and manufacture method thereof

Examples

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Embodiment 1

[0065] figure 1 Schematic diagram of the structure of the hydraulic fracturing test specimen of the prefabricated natural fracture provided in this embodiment; figure 2 A schematic diagram of making a fracture model provided in this example. Such as figure 1 and figure 2 As shown, the hydraulic fracturing test specimen of prefabricated natural fractures provided in this embodiment is a rock model 1 and a fracture model 2 located in the rock model 1 after pouring and consolidation with rock slurry, and has a direction toward the experimental test specimen. The blind hole 3 opened in the piece, wherein: the crack model 2 is a sandwich structure formed by the oppositely arranged fiber sheet 21 and filling layer 22, which can simulate natural cracks.

[0066] Specifically, the experimental specimen is a columnar body formed by placing the fracture model 2 in a mold filled with part of the rock slurry and then continuing to complete the pouring.

[0067] This embodiment does ...

Embodiment 2

[0079] This embodiment provides a method for making a hydraulic fracturing experimental specimen of a prefabricated natural fracture described in Embodiment 1, comprising the following steps:

[0080] S1. Making crack model 2

[0081] (1) According to the shape and size of the natural crack to be simulated, two fiber sheets 21 with the same shape are cut out as the two walls of the simulated natural crack.

[0082] Wherein, the fibrous sheet 21 is specifically a paper sheet, and a paper sheet whose permeability is basically similar to that of a natural crack is selected, and its basis weight is 150-200 g / square meter, and its thickness is less than 1 mm. Generally, business card paper or journal or magazine cover paper can be used.

[0083] (2) Apply glue on one of the pieces of paper, and make the glue as thin as possible on the basis of ensuring sufficient bonding strength during the glue application process.

[0084] (3) Use proppant to simulate the filling of natural fract...

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Abstract

The invention provides a hydrofracture experimental test piece for prefabricating a natural crack and a manufacture method thereof, wherein the hydrofracture experimental test piece for prefabricatinga natural crack is a rock model formed by consolidating rock slurry after being poured and a crack model located in the rock model, and a blind hole formed towards the inside of the experimental testpiece is provided, wherein the crack model is a sandwich structure formed by a fiber sheet and a filling layer, disposed relatively, capable of simulating the natural crack. The technical scheme provided by the invention can truly simulate the state of the natural crack under the formation condition, thereby satisfying the requirements for studying the development of the natural crack, the crackfilling condition, and the position relationship between the borehole or the perforation hole and the natural crack.

Description

technical field [0001] The invention belongs to the technical field of indoor physical simulation tests of hydraulic fracturing, and in particular relates to a hydraulic fracturing experimental specimen of prefabricated natural cracks and a manufacturing method thereof. Background technique [0002] With the depletion of conventional oil and gas resources, more and more attention has been paid to the development of unconventional oil and gas resources. Hydraulic fracturing is one of the key technologies for the effective development of unconventional oil and gas resources. During the hydraulic fracturing site construction, the fracturing fluid is injected into the formation through the high-pressure pump group. Since the injection volume of the fracturing fluid in the formation is greater than the fluid loss, the fracturing fluid will hold up high pressure in the formation. When the pressure reaches a certain value When the formation ruptures, hydraulic fractures are genera...

Claims

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Application Information

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IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 邹雨时周佳维马新仿张士诚陈铭李宁李四海张兆鹏曹桐
Owner CHINA UNIV OF PETROLEUM (BEIJING)