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Indoor evaluation method for profile control and water shutoff technology using polymer microsphere

A technology for profile control and water plugging and indoor evaluation, which is used in earth-moving drilling, wellbore/well components, instruments, etc. Evaluation of properties, etc.

Inactive Publication Date: 2006-07-26
SHENGLI OIL FIELD SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The viscosity of polymer microspheres in aqueous solution is close to that of water, and the viscosity of the system does not change with time; the aqueous solution of microspheres is a uniform solution system, and the volume of the solution does not change after adding microspheres to water. It is inseparable from water, so the existing indoor evaluation methods of microgels cannot be applied to the evaluation of the physical and chemical properties of polymer microspheres, the properties of profile control and water shutoff, and are not suitable for the research and determination of the mechanism of profile control and water shutoff

Method used

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  • Indoor evaluation method for profile control and water shutoff technology using polymer microsphere
  • Indoor evaluation method for profile control and water shutoff technology using polymer microsphere

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1 (as figure 1 shown)

[0026] Determination of the microscopic morphology of polymer microspheres: drop the pure aqueous solution of polymer microspheres with a concentration of 600ppm and swell at 60°C for 1 day on a thin glass slide with a dropper, and place it under a biological microscope with a magnification of 10,000 times On the screen, select the Daheng image acquisition card, start the corresponding video acquisition software to collect pictures, and collect a series of pictures, all of which are approximately regular spherical particles, as shown in Figure 3. After processing with a computer, the average particle size is determined to be 0.5 Micron; the solution expanded at 60°C for 7 days can also collect photos similar to those in Figure 3, and after computer processing, the average particle size is determined to be 4.5 microns. From this experiment, it can be confirmed that the shape of the microspheres is indeed spherical, and the expansion fa...

Embodiment 2

[0027] Embodiment 2 (as figure 1 shown)

[0028] Determination of the microscopic profile control mechanism of polymer microspheres: Etch a glass model with a pore volume of 0.02ml, and perform the process of vacuuming and saturating water according to the conventional method; then put the model under an optical microscope, turn on the computer, and start the video Program, select the magnification and focus on a pore throat with a diameter of 20 microns on the computer screen according to the conventional method; inject the polymer microsphere solution into the glass etching model at a pump speed of 0.001ml / min In the process, the plugging process of the microspheres at the pore throat was observed on the computer screen, and the video was continuously collected. Figure 4 shows the pore throat when no microspheres pass through, and Figure 5 shows four microspheres bridging and blocking the pore throat. There are many similar pictures. The microspheres are blocked at one por...

Embodiment 3

[0029] Embodiment 3 (as figure 1 shown)

[0030]The method of measuring the enhanced oil recovery of polymer microspheres in the microscopic model: the glass etching model with a pore volume of 0.016ml is vacuumized and saturated with water according to the conventional method; then the model is saturated with oil according to the conventional method. Then put the model under the stereo microscope, turn on the computer, start the video program, and select the magnification and focus on the computer screen according to the conventional method; The etching model was flooded with water for 20 minutes, then flooded with 600 ppm polymer microsphere solution for 8 minutes, and then flooded with water for 40 minutes. Finally, the collected video pictures were processed through the picture program, and the water flooding recovery rate was calculated to be 50%. After injecting the microsphere emulsion, the final recovery rate was 71%, and the recovery rate increased by 21%.

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Abstract

The invention relates to an indoor method for evaluating the new polymer micro-ball water block process, which is characterized in that: it comprises an indoor microcosmic evaluation and a macroscopic evaluation. Wherein, the indoor microcosmic evaluation system comprises a microcosmic pump, an microcosmic model of analogue ground hole condition, a microscope for observing the flowing condition of medium inside the microcosmic model, a camera and a collection card for recording and collecting the real condition under the microscope, and a compute for processing and storing the image; the macroscopic evaluation system comprises a microcosmic pump, a rock core for simulating the geologic condition, a pressure measurer for measuring the pressures at different positions of rock core, a collection card for transmitting the pressure data to the computer and a computer for storing and processing the data.

Description

1. Technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an indoor evaluation method for a novel polymer microsphere profile control and water shutoff process, so as to provide a certain theoretical basis for its mine field test. 2. Background technology [0002] Polymer microsphere technology is a new profile control and water shutoff technology developed on the basis of a deep understanding of deep profile control theory. The process relies on nano-scale and micro-scale water-swellable microspheres to gradually seal formation pore throats to achieve the effect of step-by-step deep profile control and water shutoff. [0003] Polymer microspheres are made of acrylamide, acrylic acid, Tween surfactant, crosslinking agent, industrial white oil or diesel as the main raw materials, and are prepared by emulsion polymerization or microemulsion polymerization. The finished product is made of white oil or diesel as the external phase. ...

Claims

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Application Information

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IPC IPC(8): E21B33/13G06F19/00
Inventor 肖建洪王涛曹正权陈辉宋岱锋
Owner SHENGLI OIL FIELD SINOPEC
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