Tracing and monitoring method of multi-stage fracturing flow-back fluid

Abstract

The invention provides a tracing and monitoring method of a multi-stage fracturing flow-back fluid. The tracing and monitoring method of the multi-stage fracturing flow-back fluid comprises the following steps of injecting a tracer agent into each formation in the horizontal well multi-stage fracturing operation process; in the fracturing fluid flow-back process, periodically detecting the concentration of the tracer agent in the fracturing flow-back fluid; and according to the detected concentration of the tracer agent, calculating amounts of a fracturing fluid and formation water in the fracturing flow-back fluid of each formation and drawing the section of the fracturing flow-back fluid of each formation so as to analyze a fracturing situation of each formation. According to the tracingand monitoring method of the multi-stage fracturing flow-back fluid, the fracturing situation of each formation can be quantitatively monitored; the judged fracturing situation is visual and accurateand can be quantitatively analyzed, and the error of the fracturing situation is small; and an important guiding effect on the fracturing work of the same formation is realized. After the fracturingsituation is obtained by using the tracing and monitoring method of the multi-stage fracturing flow-back fluid, a design scheme can be optimized for situations of different formations so that the fracturing targeted property is higher, the purposefulness is higher and the significance in the actual production is important.

Description

technical field [0001] The invention relates to a trace detection method for multi-stage fracturing flowback fluid, belonging to the technical field of oil and gas well fracturing. Background technique [0002] At present, with the large-scale development of horizontal wells, multi-layer and multi-stage fracturing has gradually become the preferred process for formation stimulation. However, in the process of layer selection, there is no pertinence, especially for exploratory wells, layer selection is based on experience. Therefore, it is particularly important to collect data after fracturing and analyze the fracturing effect. In the prior art, the development of fractures after fracturing can be monitored and analyzed by microseismic method, potential method, etc., but these methods have the disadvantages of complicated process and high cost, and often due to complex formation conditions and many interference factors, it is difficult to Accurately explain the fracturing ...

AI Technical Summary

Problems solved by technology

In the prior art, the development of fractures after fracturing can be monitored and analyzed by microseismic method, potential method, etc., but these methods have disadvantages such as complex process and high cost, and often due to complex formation conditions and many interference factors, it is difficult to Accurately explain the fracturing situation of each layer, and it is impossible to monitor the world-class problem of flowback fluid and production after each fracturing layer

In the previous fracturing of horizontal well layers, the amount of flowback fluid and whether crude oil and fracturing fluid are contained in the flowback fluid can only be known through the fracturing flowback fluid, but it is impossible to specifically judge the oil and fracturing fluid in each layer. Fracturing effect and fluid flow

However, the application of chemical methods in the monitoring of fracturing effects can only be used as an auxiliary means due to low monitoring accuracy and limited use.

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