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Inter-well monitoring method for radioactive isotope

A technology for radioisotopes and monitoring wells, applied in construction and other directions, can solve the problems of unfavorable personnel, environmental safety, high labor and material costs, and difficult to implement, and achieve the effects of low cost, simple operation, and easy implementation.

Inactive Publication Date: 2015-04-15
TIANJIN DAGANG OILFIELD SHENGDA TECH
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Problems solved by technology

[0004] Because the radioisotope tracer is radioactive, it is unfavorable to the safety of personnel and the environment. The application of radioisotope cross-well monitoring technology is greatly restricted. In the actual application process, it is not easy to implement, and the cost is high.

Method used

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Embodiment

[0030] A radioactive isotope cross-well monitoring method, comprising the following steps:

[0031] (1) Take background samples: Take background samples from each monitoring well, the background samples are oil-water mixed samples, the background samples contain 300-700ml of water, and the background samples contain 500ml of water. optimal;

[0032] (2) Selection and dosage of radioisotope tracer: Tritium water is used as radioisotope tracer, and the injected amount of tritium water is calculated according to the following formula:

[0033] V=∏R2ФhS

[0034] A=μMDLV

[0035] Where, V-estimated maximum dilution volume, m 3 ;

[0036] R-average well spacing, m;

[0037] h - the average thickness of the oil layer, m;

[0038] S-average water saturation of oil layer, %;

[0039] Ф-average porosity of reservoir, %;

[0040] A-tracer injection volume;

[0041] MDL-minimum detection concentration;

[0042] μ-Guarantee factor;

[0043] (3) Inject radioactive isotope tracers...

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Abstract

The invention belongs to the technical field of tracer test, and in particular relates to an inter-well monitoring method for radioactive isotope. The inter-well monitoring method for the radioactive isotope comprises the steps of obtaining a background sample; treating tritiated water as a radioactive isotope tracer agent and calculating the filling quantity of the tritiated water; transferring the tritiated water of which the filling quantity is calculated into a liquid releasing device; filling the tritiated water into a water filling well through the liquid releasing device; sampling from a monitoring oil well; processing the obtained oil-water sample and preparing into a detection-level sample; transferring the detection-level sample into a beta-ray detecting instruction for detecting to obtain detection data; further analyzing and processing; preparing a tracer agent response curve. According to the inter-well monitoring method for the radioactive isotope, the tritiated water is used as the radioactive isotope tracer agent; the radioactive isotope tracer agent has the advantages of being low in detection cycle, high in chemical and radiochemistry stability, free of attaching to rock and the oil well, and low in toxicity; a low background liquid scintiloscope and an ultralow background liquid scintiloscope is utilized to detect the strength of beta rays; therefore, the sensitivity of instruments is high; the experiment data are accurate.

Description

【Technical field】 [0001] The invention belongs to the technical field of tracer testing, in particular to a radioisotope cross-well monitoring method. 【Background technique】 [0002] With the direction of fine water injection and fine steam injection in reservoir development, the production test is gradually changing to the direction of fine stratification test, and the means of reservoir monitoring are becoming more and more important. The interwell tracing method is an important means to describe the heterogeneity and fluidity of interwell oil layers. Through this technology, the characteristics of well group connectivity, high permeability layers between oil and water wells, fault properties and remaining oil saturation evaluation can be determined. The interwell tracer test is to inject tracer into the water injection well, and monitor the output of the tracer in the surrounding production wells. If there is tracer in the production well, it proves that the water injecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/11
CPCE21B47/11
Inventor 姜义
Owner TIANJIN DAGANG OILFIELD SHENGDA TECH
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