Volume fracture dynamic flow-back simulation device and method

A simulation device and volumetric fracturing technology, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of prolonging the residence time of fracturing residual fluid, unfavorable reservoir protection, and reducing fluid drainage speed, etc. Achieve the effect of accurate and reliable experimental data, avoid skew, and good stability

Active Publication Date: 2019-08-20
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After fracturing, the fracturing fluid must be quickly returned to the formation, and at the same time, no proppant backflow can occur, otherwise sand will be produced during the fluid drainage test, which will reduce the fluid drainage speed and prolong the residence time of the fracturing residual fluid, which is not conducive to reservoir protection

Method used

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  • Volume fracture dynamic flow-back simulation device and method
  • Volume fracture dynamic flow-back simulation device and method
  • Volume fracture dynamic flow-back simulation device and method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0054] Example 1. Volume fracturing dynamic flowback simulation device

[0055] The volume fracturing dynamic flowback simulation device of the present invention, its overall structure schematic diagram (top view) is as follows figure 1 As shown, the dimensions of the dynamic flowback simulation device for volume fracturing are: length: 120-150 cm, width: 120-150 cm, height: 45-60 cm. The simulation device includes an airtight casing 19 and an experimental chamber, wherein the experimental chamber is divided into a high-temperature and high-pressure working chamber 9 and a dynamic control Cavity 8. The movable sealed steel plate 6 passes through the slide rail 15 and the airtight casing 19 (with a thickness of 16-20cm and a pressure resistance of 0-90MPa) and the upper (lower) steel plate 1 (with a thickness of 16-20cm and a pressure resistance of 0-90MPa ) sealing connection, the slide rail 15 can ensure that the movable sealing steel plate 6 moves along a determined track,...

Embodiment 2

[0061] Example 2. The method of using the dynamic flowback simulation device for volume fracturing

[0062] Use the volume fracturing dynamic flowback simulation device of the present invention according to the following steps:

[0063] (1) Assemble all the parts included in the above simulation device;

[0064] (2) Pressure test:

[0065] Connect the sand-carrying fluid injection pipe 14 of the dynamic flowback simulation device for volume fracturing to the high-pressure pipeline for fracturing with a valve, open the valve, and feed the fracturing fluid base fluid into the dynamic flowback simulation device for volume fracturing to perform Pressure suppression treatment, maintain the highest working pressure for 30-40 minutes, and the qualified standard of the pressure test is no puncture or leakage. Determine the maximum working pressure according to the specific construction site.

[0066] (3) Control system pressure:

[0067] The liquid is injected into the dynamic con...

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Abstract

The invention discloses a volume fracture dynamic flow-back simulation device and method. The simulation device comprises an airtight cavity defined by an airtight shell, an upper steel plate and a lower steel plate. The airtight cavity is divided by a movable sealing plate into a high-temperature and high-pressure work cavity and a dynamic control cavity. The movable sealing plate can move between the high-temperature and high-pressure work cavity and the dynamic control cavity. A three-dimensional rock core model is arranged in the high-temperature and high-pressure work cavity, and a sand carrying liquid injection pipe is arranged in the three-dimensional rock core model. A liquid injection pipe is arranged on an upper steel plate of the dynamic control cavity. By means of the volume fracture dynamic flow-back simulation device and method, the fracture simulation three-dimensional rock core model is adopted, design for dynamically controlling pressure control of the cavity is adopted, the formation mechanism of joint nets such as a coal bed gas reservoir and a shale gas reservoir can be studied, and the micro-crack propagation factor can be studied. By means of the volume fracture dynamic flow-back simulation device and method, due to the fact that the volume fracture dynamic flow-back system matched with field fracture construction is designed, the physical effect rule of fracture liquid retention on three-dimensional core models of coal petrography, shale and the like can be studied.

Description

technical field [0001] The invention relates to a volume fracturing dynamic flowback simulation device and a simulation method, belonging to the technical field of transformation and development of unconventional oil and gas reservoirs such as shale gas and coalbed methane, fracturing fluid flowback, and fracturing stimulation. Background technique [0002] my country has huge unconventional oil and gas reserves. With the continuous increase of proven reserves, reasonable and effective development methods have attracted more and more attention. Complex reservoirs represented by shale oil and gas reservoirs, coalbed methane reservoirs, and tight sandstone gas reservoirs have the characteristics of tight reservoirs, poor connectivity, extremely low permeability, and large seepage resistance. Volume fracturing is one of the key technologies for the economical and effective exploitation of such unconventional oil and gas reservoirs. This technology can create a complex fracture ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267E21B21/00
CPCE21B21/00E21B43/267
Inventor 吕其超左博文董朝霞
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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