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High-pressure resistant radioactive isotope tracer and preparation method thereof

A radioisotope and tracer technology, applied in construction and other directions, can solve the problems of smaller particle size of the tracer, low pressure resistance, errors, etc., so as to solve the inability to balance adsorption and pressure resistance, and improve the pressure resistance index. Effect

Active Publication Date: 2018-08-17
河南省科学院同位素研究所有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing isotope tracers will be broken due to low pressure resistance when used, which will lead to problems such as easy desorption of isotopes and small tracer particle size. When the tracer particle size is smaller than formation pores, the tracer will still It will enter the formation together with the water instead of filtering on the well wall, which will eventually result in inaccurate or even wrong logging information.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] Step 1: Dissolve barium carbonate containing radioactive isotope barium-131 ​​with an activity of 7.16 (E+8Bq) in 25ml of 10% nitric acid, and then dilute to 500ml;

[0024] Step 2: Then weigh 400g of coarse-porous silica gel with a particle size of 200-400μm and add it to the solution in step 1, stir at a temperature of 100-300°C for 3 hours, and dry;

[0025] Step 3: Add 150ml of 5% sodium carbonate solution, stir for 2 hours at a temperature of 100-300°C, and dry;

[0026] Step 4: Put the porous silica gel carrier that absorbs the radioactive isotope in a corundum sagger, then put it in a KSL-1700X-A4 box furnace, and keep it warm at 1100°C for 2 hours;

[0027] Step 5: Treat the surface of the porous silica gel carrier with resin glue, antistatic agent, temperature-resistant resin, and surfactant in sequence. The resin glue is used to block the pores on the surface of porous silica gel, and is used together with the precipitating agent to adjust the specific gravit...

Embodiment approach 2

[0032] Step 1: Dissolve barium carbonate containing radioactive isotope barium-131 ​​with an activity of 8.59 (E+8Bq) in 30ml of 40% perchloric acid, and then dilute to 500ml;

[0033] Step 2: Then weigh 400g of coarse-porous silica gel with a particle size of 200-400μm and add it to the solution in step 1, stir at a temperature of 100-300°C for 2 hours, and dry;

[0034] Step 3: Add 250ml of 2% sodium sulfate solution, stir for 2 hours at a temperature of 100-300°C, and dry;

[0035] Step 4: Put the porous silica gel carrier that absorbs radioactive isotopes in a corundum sagger, and then put it in a KSL-1700X-A4 box furnace, and keep it warm at 1200°C for 1.5h;

[0036] Step 5: Treat the surface of the porous silica gel carrier with resin glue, antistatic agent, temperature-resistant resin, and surfactant in sequence. The resin glue is used to block the pores on the surface of porous silica gel, and is used together with the precipitating agent to adjust the specific gravit...

Embodiment approach 3

[0039] Step 1: Dissolve barium carbonate containing radioactive isotope barium-131 ​​with an activity of 8.33 (E+8Bq) in 30ml of 70% perchloric acid, and then dilute to 500ml;

[0040] Step 2: Then weigh 400g of coarse-porous silica gel with a particle size of 200-400μm and add it to the solution in step 1, stir at a temperature of 100-300°C for 2 hours, and dry;

[0041] Step 3: Add 200ml of 2% sodium sulfate solution, stir for 2 hours at a temperature of 100-300°C, and dry;

[0042] Step 4: Put the porous silica gel carrier that absorbs the radioactive isotope in a corundum sagger, then put it in a KSL-1700X-A4 box furnace, and keep it warm at 1300°C for 1 hour;

[0043] Step 5: Treat the surface of the porous silica gel carrier with resin glue, antistatic agent, temperature-resistant resin, and surfactant in sequence. The resin glue is used to block the pores on the surface of porous silica gel, and is used together with the precipitating agent to adjust the specific gravi...

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PUM

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Abstract

The invention discloses a high-pressure resistant radioactive isotope tracer and a preparation method thereof. The preparation method comprises the steps that 1, a solution containing radioactive isotopes is prepared; 2, a porous adsorption material is immersed into the solution to absorb radioactive isotope ions, and drying is carried out; 3, a precipitator solution is added, the radioactive isotope ions are fixed by the precipitator, and drying is carried out; 4, a carrier is placed into a sagger, the carrier is kept warm for 1-2 hours at a certain temperature, and natural cooling is carriedout; and 5, the surface of the carrier is sequentially treated by resin adhesive, antistatic agents, heat resistance agents and surfactants. After the porous material absorbs and fixes the radioactive isotope, the radioactive isotopes are subjected to high temperature treatment, so that the pore of the porous material after absorbing the radioactive isotope is obviously smaller, and shrinks intoa more compact porous sphere, the pressure resistance index of the porous material is improved effectively, and the pressure resistance index of the isotope tracer is improved effectively.

Description

technical field [0001] The invention relates to a preparation method of a radioisotope tracer, in particular to a preparation method of a high-pressure resistant radioisotope tracer used for water absorption profile logging. Background technique [0002] As my country's onshore oilfields enter the late stage of high water-cut development, the reservoir pressure gradually decreases. In order to achieve long-term stable development, it is necessary to replenish energy to the formation and maintain the reservoir pressure, so as to achieve the goal of "water flooding" to increase crude oil production. Therefore, in addition to drilling a batch of oil production wells during oilfield development, a batch of water injection wells must also be drilled, and after a period of exploitation, individual oil wells with high water content are also changed to water injection wells. Inject water into the downhole oil layer through the water injection well to maintain the pressure of the oil...

Claims

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Application Information

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IPC IPC(8): E21B47/11
CPCE21B47/11
Inventor 李向辉张锋李甜甜遆永周吕晓华李灿然王晓慧邓刚孟闯华成武李旭照张奕苑素华董明静黎振华管晖陈海军王宏正黄伦基胡秀菊
Owner 河南省科学院同位素研究所有限责任公司
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