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A kind of instant type trace element tracer for oil field and preparation method thereof

A technology of trace elements and tracers, which is applied in the directions of measurement, earthwork drilling, wellbore/well components, etc., can solve the problems of impact, poor stability of chemicals, easy adsorption, etc., and achieve broad application prospects, fast dissolution speed, and easy use easy effect

Inactive Publication Date: 2011-12-28
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the dosage form and composition of the currently used tracers, there are many problems in the application process, such as (1) the solubility of the existing trace element tracers is generally poor, which affects the on-site dispensing speed and injection (2) Poor drug stability and easy adsorption, which affects the monitoring effect and affects its large-scale application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation of embodiment 1 instant tracer tracer Sm instant granules

[0029] Add SmCl to a 500ml beaker 3 (34.87g,) and 30ml of distilled water, stir and mix, weigh EDTANa 4 76g was dissolved in 100ml water, and EDTANa 4 solution added to SmCl 3 In the solution, stirred for a while to generate a large amount of light yellow precipitate, and continued to stir for 3h. The filter cake was obtained by suction filtration, washed three times with 95% ethanol aqueous solution by volume, and dried in an oven at 120°C for 2 hours to obtain 55.2 g of light yellow powdery solid. According to the content of samarium in the final product, the calculated yield was 66.67% .

[0030] Take by weighing 35g of rare earth Sm complex, mix the acid agent (citric acid) and alkali agent (sodium carbonate) of the effervescent agent in a molar ratio of 1:1 and weigh 10g, the microporous agent (ethylene glycol) and Disintegrants (sodium carboxymethyl starch) weighed 2.5g each, mixed u...

Embodiment 2

[0033] The preparation of embodiment 2 instant tracer tracer Ho instant granules

[0034] Add HoCl to a 500ml beaker 3 (37.77g, 0.1mol) and 30ml of distilled water, stir and mix, weigh EDTANa 4 4H 2 O 90.4g was dissolved in 86.85g water, and the prepared EDTANa 4 Aqueous solution added to HoCl 3 In the aqueous solution, stirred for a while to generate a large number of light yellow precipitates, and continued to stir for 3h. The filter cake was obtained by suction filtration, washed 3 times with 95% ethanol aqueous solution, placed in a 120° C. oven and dried for 2 hours to obtain 80.83 g of the final product, which was a light yellow powder, and the calculated yield was 78.41%. Complexometric titration Found Ho% to be 30.20%, MS-ESI, 452.8.

[0035] Take EDTAHoNa (40g) by mass, mix the acid agent (malic acid) and alkali agent (sodium bicarbonate) of the effervescent agent in a molar ratio of 1:1 and weigh 8g, the microporous agent (1,3-propylene glycol ) 1g and disinteg...

Embodiment 3

[0037] The preparation of embodiment 3 instant tracer tracer Er instant granules

[0038]Add ErCl to a 500ml beaker 3 (38.25g, 0.1mol) and 30ml of distilled water were stirred and mixed, and weighed EDTANa 4 4H 2 O 90.4g was dissolved in 86.85g water and heated to dissolve it, and the EDTANa 4 solution added to ErCl 3 The solution was stirred vigorously, and a large amount of pink precipitate was formed after stirring for 3h, and the stirring was continued for 3h. The filter cake was obtained by suction filtration, washed twice with 95% ethanol aqueous solution, placed in an oven at 120°C for 2 hours, weighed 70.78g, and was a light pink powder with a yield of 67.71%, measured by complexometric titration Er% 31.3%, MS-ESI, 453.8.

[0039] Take by weighing EDTAErNa 30g by mass ratio, the acid agent (tartaric acid) and base (calcium carbonate) of effervescent agent are mixed in molar ratio 1: 1 and take by weighing 10g, microporous agent (1,3-propanediol) 5g and Disintegra...

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PUM

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Abstract

The invention discloses an instant microelement tracer for oil fields and a preparation method thereof. Specifically, it consists of the following components according to mass percentage: 60-80% of rare earth element complex, 16-20% of effervescent agent %, microporous agent 2-10%, disintegrant 2-10%. The instant granular trace element tracer of the present invention is simple in composition, convenient to prepare, and low in cost; the granular structure makes it difficult to drift with the wind during use; the medicament of the present invention has a microporous structure and is easily dispersed in water. Accompanied by an effervescent agent, it releases gas inside, can be dissolved without stirring and has a fast dissolution rate, and has the characteristics of being easy to use in special environments such as on offshore platforms.

Description

technical field [0001] The invention relates to an inter-well tracer technology used in oil fields, and more specifically relates to an instant tracer element tracer and a preparation method thereof. Background technique [0002] For oilfields developed by water flooding, due to the heterogeneity of the reservoir plane and vertical plane, the difference in oil-water viscosity and the imbalance within the injection-production well group, it is bound to cause the injection water to travel in the direction of the production well on the plane and The phenomenon of protruding into the high permeability layer in the longitudinal direction. In order to improve the relationship between layers and increase the efficiency of water flooding, the oilfield has carried out comprehensive treatment measures such as profile control of water injection wells, water shutoff of oil wells, and plugging of large pores. The success of these measures depends on the correct degree of understanding o...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B49/00
Inventor 易飞江涛陈维余黄波高云峰王京博
Owner CHINA NAT OFFSHORE OIL CORP
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