A Method of Comprehensively Evaluating Fracturing Effect Using Multiple Tracing Means

Abstract

The invention provides a method for comprehensively evaluating fracturing effects by using multiple tracers, and relates to the field of oil layer fracturing. The pump pressure and the total flow of the fluid to be pumped are determined. Secondly, when the pumped flow reaches one-third of the total, the control unit performs a calculation on the pump pressure according to the comparison result between the real-time pressure drop and the first preset pressure drop. Finally, when the pumping flow reaches two-thirds of the total, the control unit determines whether to complete the fracturing work according to the comparison between the real-time pressure drop and the preset pressure drop, and if not, continue fracturing until it is completed , if it is completed, the fracturing effect parameters are calculated according to the flowback liquid and the count rate of quantum dots, and the fracturing effect is determined according to the fracturing effect parameters. Adjust the preset fracturing parameters at the time to improve the fracturing effect.

Description

technical field [0001] The invention relates to the technical field of oil layer fracturing, in particular to a method for comprehensively evaluating the fracturing effect by using multiple tracing means. Background technique [0002] Reservoir fracturing generally refers to using the principle of liquid pressure transmission, using a high-pressure and large-displacement pump on the ground to inject a liquid with a certain viscosity into the oil layer that is greater than the capacity that the oil layer can absorb, so that the wellbore pressure gradually increases. When the pressure is greater than the pressure required for oil layer rupture, one or several horizontal or vertical fractures will be formed in the oil layer. [0003] In the existing technology, microseismic method, potential method, etc. can be used to monitor and analyze the development of fractures after fracturing, but there are disadvantages such as complex process and high cost, and often due to complex fo...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, microseismic method, potential method, etc. can be used to monitor and analyze the development of fractures after fracturing, but there are disadvantages such as complex process and high cost, and often due to complex formation conditions and many interference factors, it is difficult to analyze the fracture development. accurate description of the effect

In the previous staged fracturing of horizontal wells, the amount of flowback fluid can only be known through the flowback fluid, but it is impossible to specifically adjust the subsequent fracturing effect to improve the fracturing effect

[0004] In summary, there is still a lack of a method in the prior art that can adjust the parameters in the fracturing process according to the bottom hole pressure of the reservoir and the rock hardness of the fractured rock formation, and evaluate the adjusted fracturing effect, and according to the Parameterized adjustment for the next fracturing to improve the evaluation method of fracturing effect

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