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Tracer for monitoring multistage fracturing flow-back fluid and monitoring method

A fracturing flowback fluid and tracer technology, applied in construction and other directions, can solve the problems of good fracturing fluid compatibility, small adsorption capacity in formation, and high analysis accuracy, and achieve good stability, small adsorption capacity, and high analysis accuracy. high effect

Active Publication Date: 2014-02-26
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tracer of the present invention can overcome the technical problems that the existing tracers cannot simultaneously meet the requirements of good compatibility with fracturing fluid, small adsorption amount in the formation, good stability, and high analysis accuracy

Method used

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  • Tracer for monitoring multistage fracturing flow-back fluid and monitoring method
  • Tracer for monitoring multistage fracturing flow-back fluid and monitoring method
  • Tracer for monitoring multistage fracturing flow-back fluid and monitoring method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides a tracer for monitoring multi-stage fracturing flowback fluid, which includes 12 kinds of tracer element complex aqueous solutions mixed with 12 kinds of tracer elements and ammonium hydrogen chloride (complexing agent) , respectively: praseodymium and hydroxylamine chloride mixed in a molar ratio of 1:8, a praseodymium chloride aqueous solution with a mass concentration of 3%-5%, and neodymium and hydroxylamine chloride mixed in a molar ratio of 1:8 Hydroxylamine chloride aqueous solution of neodymium chloride with a mass concentration of 3%-5%, samarium and hydroxylamine chloride in a molar ratio of 1:8 to form a mass concentration of 3%-5% aqueous solution of hydroxylamine chloride samarium, europium and chlorine The mass concentration of hydroxylamine chloride mixed with hydroxylamine in a molar ratio of 1:8 is 3%-5%. 5% hydroxylamine chloride gadolinium aqueous solution, terbium and hydroxylamine chloride are mixed in a molar ratio of 1:8 t...

Embodiment 2

[0034] This embodiment provides a method for monitoring multi-stage fracturing flowback fluid, which is a method for monitoring multi-stage fracturing flowback fluid using the tracer in Example 1, comprising the following steps: using the described method for monitoring The tracer layers (12 layers) of the multi-stage fracturing flowback fluid are added to the oil wells implementing the multi-stage fracturing measures, and each layer is added with a different kind of tracer element complex aqueous solution (tracer low-cost tracers in layers with large doses), during the fracturing fluid flowback process, the fracturing flowback fluid was sampled every 12 hours, and various tracer element complexes in the samples were collected. The content of the tracer element complex is detected at the same time, and the monitoring of the multi-stage fracturing flowback fluid is realized according to the detected content of the tracer element complex in each layer.

[0035] The content of th...

Embodiment 3

[0038] This example provides various performance tests of the tracer of the present invention.

[0039] (1) Thermal stability experiment

[0040] The thermal stability test is used to evaluate the thermal stability of the tracer of the present invention. The method of the thermal stability experiment includes the following steps: each of the 12 tracer elements (praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium) Prepared with complexing agent (hydroxylamine chloride) in molar ratios of 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8 and 1:9 A mass concentration of 1% tracer element complex aqueous solution (the preparation method of these tracer element complex aqueous solutions is the same as the preparation method of the tracer element complex aqueous solution in Example 1), and a total of 84 tracer element complexes were obtained. Element complex aqueous solution, the 84 kinds of tracer element complex aq...

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Abstract

The invention provides a tracer for monitoring multistage fracturing flow-back fluid and a monitoring method. The tracer comprises twelve tracer element complex water solution formed by respectively mixing twelve tracer elements with complexing agents, the twelve tracer elements include praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium. The monitoring method is a method for monitoring the multistage fracturing flow-back fluid by the aid of the tracer. The tracer is fine in compatibility with fracturing fluid, small in formation adsorption quantity, fine in stability and high in analytical precision, the twelve tracer elements are not mutually interfered, and the fracturing flow-back fluid in layers in the multistage fracturing process of an oilfield can be monitored.

Description

technical field [0001] The invention relates to a tracer for monitoring multistage fracturing flowback fluid and a method for monitoring multistage fracturing flowback fluid, belonging to the technical field of petroleum exploitation. Background technique [0002] Tracer monitoring technology is a dynamic monitoring technology widely used in oilfields at present. It is used in various oil displacement projects such as water flooding, immiscible flooding, polymer flooding, steam flooding, and SAGD. It is mainly used to monitor injection-production wells The connection relationship between them and the sweeping situation of the injected fluid in the formation. [0003] Tracer monitoring technology is also used to monitor the effect of fracturing, but it is mainly used to evaluate the development of fracturing fractures. The method is realized by using testing instruments such as gamma energy spectrometers and directional gamma meters, or magnetometers to monitor the distribut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/11
Inventor 刘徳铸张洪君王浩赵跃朋崔加利冯广慧王楠刘畅
Owner PETROCHINA CO LTD
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