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Trace element well-to-well tracer agent use method

A technology of trace elements and tracers, applied in the field of trace elements between wells and tracers, can solve the problems of small temperature range and low dosage, achieve convenient sampling, low dosage, overcome safety and The effect of environmental hazards

Inactive Publication Date: 2014-02-19
TIANJIN DAGANG OILFIELD SHENGDA TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the technical problems in the prior art, the purpose of the present invention is to provide a kind of trace element inter-well tracer and its preparation method, which overcomes the problem that the temperature range of use is small, and the tracer can be put into the wellhead Dosing or layered dosing, sampling is convenient, no need for professional participation; less dosage, economically feasible; more optional quantity, can meet simultaneous layered dosing and sampling requirements

Method used

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Embodiment Construction

[0031] The 6 kinds of tracer codes screened out in the present embodiment are Q1, Q2, Q3, Q4, Q5 and Q6, wherein Q1, Q2, Q3, Q4, Q5 and Q6 respectively represent that the rare earth elements are terbium, scandium, neodymium, Complexes of samarium, holmium and thulium. The following experiments were carried out on these 6 tracers:

[0032] (1) Analysis of oilfield injection water and produced water, the purpose is to study the compatibility of complexing agent and formation water

[0033] The purpose of the compatibility test is to determine the compatibility of the tracer with the high-salinity formation water. The test method is as follows:

[0034] Prepare Q1, Q2, Q3, Q4, Q5, and Q6 complexing agent solutions with concentrations of 10μg / L, 20μg / L, and 30μg / L respectively, and then form a formation with a salinity of about 20,000mg / L at a volume ratio of 1:1 water to mix. After standing overnight at 350°C, measure the concentration change of each tracer element, study the ...

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Abstract

The invention discloses a trace element well-to-well tracer agent use method and relates to an oilfield flooding trace element tracer and a use method of the oilfield flooding trace element tracer in oil reservoir dynamic monitoring. The trace element well-to-well tracer use method is characterized in that a very trace amount of a trace element which exists or does not exist in the stratum and the fluid in the stratum is used as a tracer; a polymer hydrophilic complex and a rare earth element undergo a complex reaction to produce a tracer agent; the tracer agent is injected by an injection well; samples are extracted from surrounding production wells according to a certain sampling requirement and are used for monitoring on production well output cases; and the samples are analyzed and a tracing output curve is obtained. The trace element well-to-well tracer agent obtained by the method has high stability and is convenient for accurately determining thickness and permeability of a water flooded layer, a large-tunnel diameter, and water injection well outside channeling and crack orientation.

Description

technical field [0001] The invention belongs to the technical field of oil field injection and production, and relates to a tracer, in particular to a trace element well tracer and an application method thereof. Background technique [0002] In oilfields in the later stage of water flooding development, due to the difference in anisotropic permeability of the reservoir, the difference in oil-water viscosity and the imbalance of the hydrodynamic field during the development process, it is bound to cause the single-layer intrusion of the injected water in the vertical direction and the tongue intrusion in the plane. Make production wells break through water prematurely, and the water cut is getting higher and higher. At this time, the degree of recovery is low, and a large amount of remaining oil remains in the reservoir. [0003] Oilfield water injection tracer technology is one of field production testing technologies, and its principle is to inject tracer from injection we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/00E21B47/11E21B49/08
Inventor 邬传威梁金慧
Owner TIANJIN DAGANG OILFIELD SHENGDA TECH
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