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Experimental device for simulating spreading of propping agent in crack and application thereof

An experimental device and proppant technology, applied in the field of oil and gas field development and research, can solve problems such as roughness, small size, and no consideration of fracture walls, and achieve the effect of reliable measured data and large scale

Active Publication Date: 2012-07-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

3. The core components of the experimental device are completely different
There are concentric cylinder devices and flat-plate devices for studying this law in foreign countries. However, the experimental devices do not determine the indoor simulation parameters according to the principle of similarity, and are small in size. They can only conduct simple research on the settlement of proppant, and cannot study the sand. In addition, the model does not take into account the roughness of the fracture wall, the leakage of fracturing fluid in the fracture, and the aperture, phase and density of the perforation holes in the wellbore, so it is quite different from the actual situation.

Method used

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  • Experimental device for simulating spreading of propping agent in crack and application thereof
  • Experimental device for simulating spreading of propping agent in crack and application thereof
  • Experimental device for simulating spreading of propping agent in crack and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Such as figure 1 As shown, an experimental device for simulating the laying of proppants in fractures includes artificial fractures. The artificial fractures include two transparent flat plates 9 arranged parallel to each other. The upper and lower ends of the two transparent flat plates 9 are respectively wrapped Frame 18 is sealed, and a simulated shaft 19 is set at the left end of the transparent plate, and a liquid outlet pipe 21 is set at the right end of the transparent plate 9, and the transparent plate 9, the frame 18, the 19 cylinder walls of the simulated well shaft and the liquid outlet pipe 21 The cylinder walls together form a closed space; the top of the simulated wellbore 19 is provided with a feed port 8, the bottom of the simulated wellbore 19 is provided with a discharge port 11, and a plurality of cylinders are uniformly arranged on the simulated wellbore wall and toward the direction of the confined space. Wall perforation 10, the feed port 8, discha...

Embodiment 2

[0057] An experimental method utilizing the experimental device described in Example 1 to simulate proppant laying in a fracture, the steps are as follows:

[0058] (1) According to the principle of similarity, according to the width and size of the fracture in the field construction, calculate the proppant dose, fracturing fluid volume, fracturing fluid viscosity and experimental displacement required for the experiment;

[0059] (2) Calculate the required proppant dose, fracturing fluid volume and experimental displacement, fracturing fluid and various proppants according to the calculation in step (1);

[0060] (3) Adjust the distance between the two transparent plates 9 in the artificial fracture to make it consistent with the width of the fracture in the field construction; adjust the number of perforations on the wall of the simulated wellbore, the aperture of the perforation on the wall and the perforation on the wall The phase angle of the cylinder wall: the number of ...

Embodiment 3

[0067] An experimental device as described in Embodiment 1, the difference is that the experimental device also includes a data acquisition control board and a computer, and the experimental data collected by the experimental device is transmitted to the computer through the data acquisition control board. The experimental data include the vertical settlement velocity and horizontal migration velocity of the proppant, the velocity and shape of the sand bank formed by the proppant settlement in the artificial fracture, the mass ratio of the proppant settled in the artificial fracture to the total proppant, etc. .

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Abstract

The invention relates to an experimental device for simulating the spreading of a propping agent in a crack, which comprises an artificial crack, the artificial crack comprises two mutually-parallel transparent plates, the upper and lower ends of the two transparent plates are sealed respectively by an edge-coating frame, the left end of each transparent plate is provided with a simulated shaft, the right end of the transparent plate is provided with a liquid outlet pipe, and the transparent plates, the edge-coating frames, the walls of the simulated shafts and the walls of the liquid outlet pipes define a closed space. According to the invention, under the condition of taking different crack widths, crack surface coefficients, sand expansion ratios, fracturing-fluid leak-off levels, friction resistances in cracks and the like into consideration, the experimental device simulates the spreading situation of a propping agent in the artificial crack, therefore, the experimental device accurately simulates the situations of cracks in stratums, and the accuracy is greatly improved.

Description

technical field [0001] The invention relates to an experimental device for simulating the laying of proppant in fractures and its application, belonging to the technical field of oil and gas field development and research. Background technique [0002] In hydraulic fracturing, the placement of proppant in the fracture plays a critical role in the success of the operation. During the fracturing process, the sand mixing fluid is pumped into the fracture, and under the influence of gravity, buoyancy, liquid carrying capacity in the horizontal direction, and viscous resistance, the proppant has a concentration difference on the vertical section of the fracture, from top to bottom. The bottom can be divided into no-sand area, suspension area, particle tumble area, and sand embankment. During on-site construction, the proppant may all settle to the bottom of the fracture, resulting in no proppant filling in the upper part of the fracture, thus forming invalid fracture support, wh...

Claims

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Application Information

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IPC IPC(8): G01V9/00
Inventor 温庆志罗明良翟恒立潘晓军战永平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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