True triaxial fracturing simulation device of simulating proppant placement and working method thereof

A simulation device and proppant technology, applied in the field of true triaxial fracturing simulation device, can solve the problems of reducing the service life of fracturing pumps, easy wear of high-pressure pumps, easy-wear pumps, etc., and achieve enhanced bonding strength and improved sealing strength , the effect of improving the success rate

Inactive Publication Date: 2018-10-19
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to avoid the above problems, laboratories usually reduce the wellbore diameter to 3-10mm (inner diameter 1-8mm) to reduce the cemented interface to improve the sealing between the wellbore and the rock sample, resulting in the wellbore being too thin to simulate pump injection support agent fracturing process
In addition, the pressure range required for rock sample fracturing is 20-80MPa, and the supporting fracturing pump is required to be a high-precision equipment that can provide higher pressure. Because the proppant particles are easy to wear the working blades or pistons of the pump, the

Method used

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  • True triaxial fracturing simulation device of simulating proppant placement and working method thereof

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Embodiment 1

[0048] A true triaxial fracturing simulation device for simulating proppant placement in this embodiment, such as figure 1 As shown, through the main line 9, the fracturing fluid stirring tank 1, the fracturing pump 5, the proppant stirring tank 7, and the fracture growth simulation component are sequentially connected, wherein the proppant stirring tank is connected with branch pipelines in parallel, and the parallel interface is a turning point A switch 10; the top of the fracturing fluid mixing tank 1 is provided with a fracturing fluid inlet 4, and the bottom of the side is provided with a discharge port connected to the main line 9; the inside of the proppant mixing tank 7 includes a mixer 2, and the axial sides are respectively provided The fracturing fluid inlet and the sand mixing fluid outlet connected to the main pipeline, and the fracturing fluid inlet is located higher than the sand mixing fluid outlet, and the top has a proppant inlet 8; the fracture growth simulat...

Embodiment 2

[0061] The present embodiment is the working method of above-mentioned equipment, comprises steps as follows:

[0062] (1) Assemble the wellbore device 16, install the end sealing cover, determine the hole density, use nuts to seal the excess holes if necessary, and install the adapter 12 on the top of the wellbore;

[0063] (2) Prepare the raw materials required for making rock samples such as cement, concrete, coal rock, fiber, etc., consolidate together with the wellbore to make a reservoir simulation rock sample 14 of a certain size, and dry the rock samples to the state required for the experiment;

[0064] (3) Install the rock sample 14 and the wellbore 16 to the inside of the fracturing simulation container 13, and fix the jack 15 on the front, back, left, right, and upper 5 walls of the rock sample;

[0065] (4) Prepare the experimental fracturing fluid system and prepare proppant materials for fracturing;

[0066] (5) arrange the laboratory, move the experimental equ...

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Abstract

The invention relates to a true triaxial fracturing simulation device for simulating proppant placemen and a working method thereof, and belongs to the technical field of oil and gas field development. The device comprises a fracturing fluid stirring tank, a fracturing pump, a proppant stirring tank, a crack extension simulation component, and an integrated control system which are sequentially connected by a main line. The proppant stirring tank has parallel branch lines. A steering switch is arranged between the fracturing pump and the proppant stirring tank to control the connection and disconnection between the main line and the branch lines of the proppant stirring tank; and a metal-threaded shaft with a certain deformation is installed inside a fracturing simulation rock sample. Theindependent proppant adding device and the steering switch are arranged to improve the shape of the shaft and add a fiber material, the sealing strength between the shaft and the rock sample contact surface is improved, sand adding simulation is achieved during a crack initiation/expansion process, the success rate of true triaxial fracturing laboratory experiments is improved, and the true triaxial fracturing simulation device has important guiding significance for studying the proppant migration law and the optimal design of a fracturing construction scheme.

Description

technical field [0001] The invention relates to a true triaxial fracturing simulation device for simulating proppant laying and a working method thereof, belonging to the technical field of oil and gas field development. Background technique [0002] my country's unconventional oil and gas reservoirs are widely distributed. Due to their characteristics of low porosity and low permeability, the seepage resistance of oil and gas in the reservoir matrix is ​​extremely high. Usually, fracturing stimulation technology is used to achieve economical and effective exploitation of low permeability oil and gas reservoirs. . Hydraulic fracturing is a very complicated stimulation process for oil and gas wells. The ground high-pressure pump group is used to pump fracturing fluid into the well with a displacement exceeding the absorption capacity of the formation, and the high pressure is generated at the bottom of the well. When the pumping pressure overcomes the well wall When the nearb...

Claims

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Application Information

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IPC IPC(8): G09B25/02E21B43/26
CPCE21B43/26G09B25/02
Inventor 刘欣佳肖凤朝张遂安王洪利刘玮
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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