Method for monitoring horizontal well staged fracturing effects by micro-element tracer

A trace element, staged fracturing technology, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve problems such as inaccurate evaluation of fracturing effects, avoid inaccurate monitoring results and ensure accuracy Effect
CN108729909AInactive Publication Date: 2018-11-02青岛大地新能源技术研究院
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
青岛大地新能源技术研究院
Publication Date
2018-11-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for monitoring horizontal well staged fracturing effects by a micro-element tracer. The method mainly includes the steps: 1) selecting a micro-element with low background concentration as the tracer; 2) estimating the dosage of the tracer at each stage according to the dosage of fracturing fluid at each stage; 3) adding the tracers into a fracturing blender truck by a constant-flow pump through a ground low-pressure pipeline, and adding different tracers into different layer stages in fracturing; 4) performing cluster sampling on fracturing flow-back fluid after fracturing, detecting concentration of the tracer in the flow-back fluid, drawing a curve of the concentration of the tracer along with time variation, calculating water yield of each stage, analyzing fracture morphology after each stage is fractured, determining contribution of each stage to the water yield, and defining connectivity between a well bore and a well after fracturing. The method solves the problems that signal-to-noise ratio is low, reliability is poor, cost is high, radioactive contamination is generated, and the fracturing effects of each stage cannot be accurately evaluatedafter horizontal well staged fracturing is implemented.
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Description

technical field

[0001] The invention belongs to the technical field of unconventional oil and gas field development, and in particular relates to a method for monitoring the staged fracturing effect of a horizontal well by using a trace element tracer. Background technique

[0002] At present, the commonly used fracturing monitoring technologies mainly include surface and downhole combined microseismic monitoring technology and isotope tracer monitoring technology. These two technologies are mainly used to monitor fracture morphology after fracturing, but there are technical limitations in their application. The microseismic monitoring technology combining surface and downhole has the disadvantages of low signal-to-noise ratio, poor reliability, and high cost; isotope tracer There is a certain amount of radioactivity in the agent monitoring technology, which is harmful to the construction personnel. The most important point is that neither of these two technologies can accur...

Claims

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