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Microelement interwell tracer agent and application thereof

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

Active Publication Date: 2014-03-05
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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  • Microelement interwell tracer agent and application thereof
  • Microelement interwell tracer agent and application thereof
  • Microelement interwell tracer agent and application thereof

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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 microelement interwell tracer agent and the application of the microelement interwell tracer agent, and relates to oilfield flooding micro tracer agents and a using method of the tracer agents in oil reservoir dynamic monitoring. Microelements which are not included in a stratum or fluid of the stratum or minimal microelements which are included in the stratum or the fluid of the stratum serve as the tracer agent, a macromolecule hydrophilic complex and rare earth elements are adopted to carry out complexation to prepare the tracer agent, the tracer agent is injected from an injection well, then sampling is carried out on surrounding production wells according to a certain sampling rule, the production condition is monitored, samples are analyzed, and a tracer production curve is obtained. The microelement interwell tracer agent is high in stability, and the thickness and permeability of a water flooded layer, the diameter of a duct, and the positions of external channeling and fractures of an injection well pipe can be determined accurately and conveniently.

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): E21B47/11C07F5/00
Inventor 梁金慧邬传威
Owner TIANJIN DAGANG OILFIELD SHENGDA TECH
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