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Monitoring method for hydraulic fracturing based on distributed optical fiber sound monitoring and distributed optical fiber temperature monitoring

A distributed optical fiber and hydraulic fracturing technology, applied in surveying, earthmoving, wellbore/well components, etc., can solve the problems of difficult multi-stage fracturing artificial fracture process monitoring, poor accuracy, and high implementation costs

Active Publication Date: 2019-10-15
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, microseismic monitoring, production logging and other methods are usually used to monitor the hydraulic fracturing process and post-fracturing production process. These methods are expensive to implement and complicated to operate, and it is difficult to accurately create fractures for multi-stage fracturing artificial fractures. The process and production process are monitored, and microseismic monitoring belongs to far-field monitoring, which is subject to many external interference factors and has poor accuracy

Method used

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  • Monitoring method for hydraulic fracturing based on distributed optical fiber sound monitoring and distributed optical fiber temperature monitoring
  • Monitoring method for hydraulic fracturing based on distributed optical fiber sound monitoring and distributed optical fiber temperature monitoring
  • Monitoring method for hydraulic fracturing based on distributed optical fiber sound monitoring and distributed optical fiber temperature monitoring

Examples

Experimental program
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Effect test

Embodiment 1

[0073] A hydraulic fracturing monitoring method based on distributed optical fiber sound monitoring and distributed optical fiber temperature monitoring, using the sound signal reflected from the downhole by the single-mode acoustic sensing fiber and the temperature signal reflected from the downhole by using the multi-mode temperature-sensing optical fiber for processing Finally, it is obtained: the fracturing status of each fracturing section during the hydraulic fracturing process, and / or the real-time flow rate of each fracturing section during the post-fracturing production process, and / or the water content;

[0074] The module for processing the sound signal and temperature signal is a DAS / DTS hydraulic fracturing monitoring and interpretation module including a data preprocessing module, a fracturing process interpretation module and a post-fracturing production interpretation module; the DAS / DTS hydraulic fracturing monitor 7 has a spatial resolution of 1 meter, a respo...

Embodiment 2

[0100] A hydraulic fracturing monitoring method based on distributed optical fiber sound monitoring and distributed optical fiber temperature monitoring as described in Example 1, the difference is that the sound signal reflected from the downhole by the single-mode acoustic sensing optical fiber and the multi-mode sensing The temperature signal reflected back from the downhole by the temperature optical fiber is processed to obtain: the real-time flow rate of each fracturing layer during the post-fracturing production process, and / or the real-time flow rate of each fracturing layer during the post-fracturing production process, and / or water content The implementation method is as follows:

[0101] 2-4) Calculate the fluid flow rate and proppant volume entering each decompressed fracture interval:

[0102] Add all the areas of the graphs surrounded by the curves corresponding to the fractured intervals in the "Waterfall Diagram" to calculate the total graph area; use the curve...

Embodiment 3

[0122] In order to realize the monitoring method described in embodiments 1 and 2, the hardware installation method for collecting sound signals and temperature signals is as follows:

[0123] Using DAS / DTS hydraulic fracturing monitor 7 and armored optical cable 8, the DAS / DTS hydraulic fracturing monitor 7 is placed on the ground and directly connected to armored optical cable 8; armored optical cable 8 is attached to the fracturing pipe string Or on the production string 5, run into the well with the fracturing string or the production string 5 during the hydraulic fracturing process or the post-fracturing production process;

[0124] The armored optical cable 8 is made of a plurality of single-mode sound-sensing optical fibers and a plurality of multi-mode temperature-sensing optical fibers armored by seamless stainless steel tubes or armored by decomposable aluminum alloy; the plurality of single-mode The acoustic optical fiber can be 1, 2, 5, or arbitrarily many; the mul...

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Abstract

According to a monitoring method for hydraulic fracturing based on distributed optical fiber sound monitoring and distributed optical fiber temperature monitoring, sound signals reflected from a downhole by single-mode sound-sensing optical fibers as well as temperature signals reflected from the downhole by multi-mode temperature-sensing optical fibers are processed to obtain: whether each to-be-fractured interval is fractured or not, and / or the real-time flow rate and / or water cut of each fractured interval in the post-fracture production process. The monitoring method described in the invention is a near-field monitoring method, and can monitor whether each perforation in each fractured interval is fractured or not in real time; and multi-stage hydraulic fracturing can be monitored through once running into the downhole, and the influences of a current to-be-fractured interval on the adjacent fractured intervals can be monitored.

Description

technical field [0001] The invention relates to a hydraulic fracturing monitoring method based on distributed optical fiber sound monitoring and distributed optical fiber temperature monitoring, and belongs to the technical field of real-time monitoring of oil and gas exploitation. Background technique [0002] Hydraulic fracturing is a key technology for the efficient development of unconventional oil and gas reservoirs and hot dry rocks. Hydraulic fracturing is used to transform the reservoir and form a fracture network structure in the reservoir, which can effectively increase the oil and gas production of oil and gas wells and enhance the heat production of the geothermal system (EGS). Therefore, the artificial fractures formed by hydraulic fracturing are reservoir fracturing reconstruction The direct reflection of the effect is also an important basis for evaluating the productivity of hydraulic fracturing wells. At present, microseismic monitoring, production logging ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/10E21B47/06E21B47/12G06F17/50
CPCE21B47/07E21B47/107E21B47/135G06F30/20
Inventor 刘均荣李一强
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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