Method for tracking a treatment fluid in a subterranean formation

a technology of treatment fluid and subterranean formation, which is applied in the field of tracking a treatment fluid in a subterranean formation, can solve the problems that radioactive or chemical substances are sometimes not desirable, and achieve the effect of strong stabilization

Inactive Publication Date: 2013-12-26
SCHLUMBERGER TECH CORP
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Benefits of technology

[0013]The nano-bubbles are normally created by dispersion of above mentioned gas or gases in water- or hydrocarbon-based solutions Water solutions can be made with different conventional oilfield salts (NaCl, KCl, CaCl2, ZnBr2, CaBr2, and other inorganic or organic brines and their mixtures) that are used as completions solutions (brines and heavy brines) and other oilfield fluids. Nano-bubbles can be particularly strongly stabilized with electrolytes of ferrous ions, manganese ions, calcium ions, or any other mineral ion is added to the aqueous solution such that the electrical conductivity in the aqueous solution becomes not less than 300 μS / cm. The nano-bubble is a very tiny bubble having a diameter of not more than 500 nm, so that the nano-bubble does not experience buoyant forces and rupture near the fluid surface, which is observed in normal and micro-bubbles.

Problems solved by technology

The use of radioactive or chemical substances as tracers sometimes is not desirable and is even prohibited by environmental regulations.

Method used

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  • Method for tracking a treatment fluid in a subterranean formation

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Embodiment Construction

[0026]A treatment fluid comprising a plurality of tracer agents, wherein each tracer agent is an object of submicron scale, is injected into the wellbore and the formation. Typical diameter / length dimension of a tracer agent is within the range between 1-1000 nm.

[0027]The injection or flow of objects of submicron scale (so called nano-tracers) that are contained within the treatment fluid serve as markers / tracers because their property of staying in bulk of the transport fluid without gravity segregation and no change in type of distribution function of the markers within time of the duration of the formation treatment and measurement operation. Further the nano-tracers have the main advantage that because of their size will occupy the whole volume that the fluid has created in the formation, including pore space or ultra small fissures where the fluid leaked off. This is in particular important in matrix acidizing where fluid is injected into pore space or in shale gas fracturing w...

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Abstract

A method of tracking a treatment fluid in a subterranean formation penetrated by a wellbore provides for injecting the treatment fluid with the plurality of tracer agents into the well and the formation. Each tracer agent is an object of submicron scale. The location and distribution of the treatment fluid is determined by detecting changes in the physical properties of the formation caused by the arrival of the treatment fluid comprising a plurality of tracer agents.

Description

FIELD OF THE INVENTION[0001]This invention relates generally to the recovery of hydrocarbons from a subterranean formation penetrated by a well bore and more particularly to non-radioactive tracers and methods of utilizing the non-radioactive tracers for tracking treatment and reservoir fluids in the formation in order to evaluate and understand the operations executed in the wellbore and / or in the reservoir, near wellbore and wellbore processes and fluid placements such as gravelling packing, hydraulic fracturing, sand control and cementing and drilling fluids flow and placement.BACKGROUND OF INVENTION[0002]The use of various kinds of markers / tracers in the oil and gas industry is well known. Radioactive and / or chemical tracers which can be readily identified are used for monitoring of treatment fluids injection into the reservoir as a means to monitor hydraulic fracturing, acidizing, water control and other wellbore and reservoir treatments.[0003]Thus, U.S. Pat. No. 5,243,190 prov...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B47/10
CPCE21B47/10E21B43/166E21B43/25E21B47/11E21B28/00E21B43/24E21B43/26
Inventor BELANI, ASHOKPISSARENKO, DIMITRI VLADILENOVICHBUTULA, KRESO KURTSAFONOV, SERGEY SERGEEVICHDINARIEV, OLEG YURIEVICHZOZULYA, OLEG MIKHAILOVICH
Owner SCHLUMBERGER TECH CORP
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