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

Inactive Publication Date: 2018-11-02
青岛大地新能源技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for monitoring the staged fracturing effect of horizontal wells using trace element tracers in order to solve the limitations of the prior art, especially the inability to accurately evaluate the fracturing effect of each stage. Accurately analyze the fracture morphology o

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The method of using trace element tracers to monitor the effect of staged fracturing of a horizontal well is designed for 4 stages of fracturing for one horizontal well.

[0057] Specific steps are as follows:

[0058] (1) The number of stages for fracturing monitoring in horizontal wells is 4, and trace elements with low background concentrations in each well section are selected as tracers, and the tracers injected in the first to third stages are ethylenediaminetetramethylene Yttrium phosphonate, samarium ethylenediaminetetramethylenephosphonate, gadolinium ethylenediaminetetramethylenephosphonate, thulium ethylenediaminetetramethylenephosphonate;

[0059] (2) According to the on-site fracturing construction parameters: the total injection volume of single-stage pre-fluid and sand-carrying fluid is 300m 3 , construction displacement 5m 3 / min, the amount of tracer in each section is 150g;

[0060] (3) When fracturing starts, use a constant flow pump to add tracer ...

Embodiment 2

[0068] The method of using trace element tracers to monitor the effect of staged fracturing of a horizontal well aims at designing 9 stages of fracturing for one horizontal well.

[0069] Specific steps are as follows:

[0070] (1) The number of stages for horizontal well fracturing monitoring is 9, and trace elements with low background concentrations in each well section are selected as tracers. The tracers injected from the first to ninth stages are yttrium chloride and chlorine Samarium Hydroxylamine, Gadolinium Hydroxylamine Chloride, Erbium Hydroxylamine Chloride, Neodymium Hydroxylamine Chloride, Praseodymium Hydroxylamine Chloride, Ytterbium Hydroxylamine Chloride, Holmium Hydroxylamine Chloride, Europium Hydroxylamine Chloride;

[0071] (2) According to the on-site fracturing construction parameters (the total injection volume of pre-fluid and sand-carrying fluid in a single stage is 500m 3 , construction displacement 5m 3 / min), the consumption of each section trac...

Embodiment 3

[0077] The method of using trace element tracers to monitor the effect of staged fracturing of horizontal wells is designed for 10 stages of fracturing for one horizontal well.

[0078] Specific steps are as follows:

[0079] (1) The number of stages for fracturing monitoring in horizontal wells is 10, and trace elements with low background concentrations in each well section are selected as tracers, and the tracers injected in the first to tenth stages are yttrium ethylenediaminetetraacetate , Samarium EDTA, Gadolinium EDTA, Erbium EDTA, Neodymium EDTA, Praseodymium EDTA, Ytterbium EDTA, Holmium EDTA, Europium EDTA, Thulium EDTA;

[0080] (2) According to the on-site fracturing construction parameters (the total injection volume of pre-fluid and sand-carrying fluid in a single stage is 400m 3 , construction displacement 5m 3 / min), the consumption of each section tracer is 200g;

[0081] (3) When fracturing starts, use a constant flow pump to add tracer to the sand mixing...

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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.

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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Application Information

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IPC IPC(8): E21B47/11E21B43/26
CPCE21B43/26E21B47/11
Inventor 张东晓史胜龙房堃
Owner 青岛大地新能源技术研究院
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