Method for preparing radioisotope tracer

A radioisotope and tracer technology, applied in the field of radioisotope tracer preparation, can solve problems such as poor temperature and pressure resistance, failure to meet logging needs, and distortion of logging results, so as to achieve less injury to operators, Good logging effect and uniform density

Active Publication Date: 2011-09-14
河南省同新科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these two tracers have problems such as high wet density, uneven density, tracer sinking, radioactive contamination, isotope desorption, tracer agglomeration, and poor temperature and pressure resistance to varying degrees, resulting in Logging results are distorted, which brings troubles to logging production and can no longer meet logging needs

Method used

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  • Method for preparing radioisotope tracer
  • Method for preparing radioisotope tracer

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Dissolve barium carbonate containing the radioactive isotope barium-131 ​​with an activity of 30mCi in 30ml 40% perchloric acid, then dilute to 500ml, weigh 1L of 300-600μm fine-pored silica gel and add it to the solution at a temperature of 100-300 Stir at ℃ for 5 hours. After the silica gel is dried, add 200ml, 2% sodium sulfate solution and dry at 100-300℃. Then, perform the following treatments in order: ①Add 400ml resin glue, 60℃, Stir at 20 min-1 for 9h; ②1g antistatic agent, stir at 80℃, at 20 min-1 for 2h; ③Temperature-resistant resin 400ml, stir at 100℃, at 30 min-1 for 8h; ④Surfactant 60ml, 75°C, stirring at 25 min-1 for 6h. Finally, a radioisotope tracer for water absorption profile logging is obtained.

[0029] The performance test is as follows: After the prepared tracer is soaked in distilled water for 2 hours, the specific gravity is measured to be 1.03-1.06g / cm3; the tracer is placed in a polyester textile bag and put into the water pressure test device to...

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Abstract

The invention discloses a method for preparing a radioisotope tracer. The method comprises the following steps of: dissolving carbonate which contains a radioisotope by using an acid; immersing a porous carrier into a solution, absorbing an isotope ion, and then stirring at the temperature of 100 to 300 DEG C for a certain time until the porous carrier is dried; after the porous carrier is dried, fixing the isotope ion by using a precipitant, and drying at the temperature of 100 to 300 DEG C; carrying out surface treatment on the dried porous carrier, and adding a resin adhesive, an antistatic agent, temperature-resistant resin and a surfactant sequentially; and carrying out surface treatment on the porous carrier to obtain the radioisotope tracer for injection profile logging. The method is simple and convenient to operate; the prepared injection profile logging tracer is low and uniform in density and good in suspension property, avoids agglomeration in a water suction solution and cannot sink or float upwards; and the radioisotope tracer is low in isotope desorption rate, stable in radiation strength and low in isotope contamination, and resists high temperature of 120 DEG C and pressure of 60 MPa.

Description

Technical field [0001] The invention relates to a preparation method of a radioisotope tracer, in particular to a preparation method of a radioisotope tracer for injection profile logging with the radioisotope barium-131 ​​as a characteristic marker. Background technique [0002] Type a paragraph describing the technical field here. After the oilfield enters the middle and late stages of development and oil recovery, artificial water injection or polymer is used to maintain the pressure of the oil layer to achieve the purpose of improving the ultimate recovery rate. In order to obtain information on the injection status of intervals and sub-layers, radioisotope tracing methods are widely used in oil fields to measure the water absorption profile of injection wells. Usually the radioisotope tracer is released at a specified depth, and the tracer forms an activated suspension with the injected material in the well. When the selected tracer diameter is equivalent to the diameter of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B49/00E21B43/20E21B43/22
Inventor 遆永周吕晓华邓刚华成武孟闯
Owner 河南省同新科技有限责任公司
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