A trace element well tracer and its application

A trace element and tracer technology, which is applied in the field of tracer and trace element interwell tracer, can solve the problems of small temperature range and low dosage, and achieves convenient sampling, low dosage and economic feasibility. Effect

Active Publication Date: 2016-06-15
TIANJIN DAGANG OILFIELD SHENGDA TECH
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  • Abstract
  • Description
  • Claims
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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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  • A trace element well tracer and its application
  • A trace element well tracer and its application
  • A trace element well tracer and its application

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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 interwell tracer and its application, and relates to an oilfield water injection trace tracer and a method for using the tracer in oil reservoir dynamic monitoring. Using the tracer that does not contain or contains very little trace elements in the formation and its fluids, the tracer is prepared by complexing the macromolecular hydrophilic complex with rare earth elements, injecting from the injection well, and then according to a certain According to the sampling regulations, take samples from the surrounding production wells, monitor their production, analyze the samples, and obtain the trace production curve. The micro-tracer provided by the invention has high stability and is convenient for accurately determining the thickness and permeability of the water-flooded layer, the diameter of the large pore, the channeling outside the pipe of the water injection well and the orientation of the fracture.

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 Patents(China)
IPC IPC(8): E21B47/11C07F5/00
Inventor 梁金慧邬传威
Owner TIANJIN DAGANG OILFIELD SHENGDA TECH
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