Cooling medium and cooling device for surface cooling treatment of oil-based drilling fluid

An oil-based drilling fluid and cooling medium technology, which is applied in the fields of refrigerators, refrigeration and liquefaction, heat exchange materials, etc., can solve the problems that the steering tool system cannot adapt, the drilling operation cannot be carried out, and the tool signal transmission is abnormal. Small footprint, improved stability, and the effect of not easy to aggregate

Active Publication Date: 2021-04-16
四川页岩气勘探开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Horizontal well drilling generally uses oil-based drilling fluid, but due to the high formation temperature, the conventional steering tool system cannot adapt to it, and the tool signal transmission will be abnormal during drilling, and even the steering tool will have no signal, so that the drilling operation cannot be carried out
At present, in terms of the material of the steering tool itself, no effective solution has been found. Therefore, in order to prevent the abnormal signal of the steering tool and prolong the service life of the steering tool, an efficient surface cooling method is urgently needed for oil-based drilling fluids in high-temperature wells.

Method used

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  • Cooling medium and cooling device for surface cooling treatment of oil-based drilling fluid
  • Cooling medium and cooling device for surface cooling treatment of oil-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A cooling medium used for surface cooling treatment of oil-based drilling fluid in high-temperature wells. The specific preparation method: add 100 kg of ethylene glycol with a mass fraction of 98% into a 2.0 cubic meter enamel stirring tank, and add 0.5 kg of ethylene glycol under stirring at 60 rpm Triethylene glycol bridged cyclodextrin and 0.8kg of 20nm-40nm metal copper nanoparticles, after continuing to stir for 15min, add 0.25kg of sodium dodecylbenzenesulfonate and 40kg of water, increase the speed to 2000rpm, stir for 15min, and obtain complex matching cooling medium.

Embodiment 2

[0028] Such as figure 1 As shown, the cooling device used in conjunction with the cooling medium provided by the present invention has a structure comprising: a drilling fluid storage tank 2, a primary plate cooler 4, a secondary plate cooler 5, an ultrasonic radiation tank 7, and a water chiller 8.

[0029] The plate bundles of the first-stage plate cooler and the second-stage plate cooler are arranged vertically. The plate material is SS30408 ​​stainless steel, the drilling fluid is on the wide channel side, and the channel spacing is 12mm. The cooling medium is on the narrow channel side, and the channel spacing is 8mm. The top of the drilling fluid storage tank is provided with a drilling fluid inlet 1 and a nitrogen injection hole 10 . The space above the liquid level in the drilling fluid storage tank is filled with nitrogen to protect the drilling fluid and prevent the drilling fluid from contacting with air. The liquid outlet at the lower part of the drilling fluid ...

Embodiment 3

[0033] In Example 1, the triethylene glycol bridged cyclodextrin was changed to 0.7 kg, the metal copper nanoparticles were changed to 1.0 kg, and the addition of other components remained unchanged to obtain a composite cooling medium.

[0034] The cooling medium is used in conjunction with the cooling device in Example 2. After cooling the 70°C oil-based drilling fluid, the measured temperature of the low-temperature drilling fluid discharged from the secondary plate heat exchanger 5 is 28.6°C.

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Abstract

The invention discloses a cooling medium for oil-based drilling fluid surface cooling treatment, which comprises the following components in parts by weight: 100 parts of ethylene glycol, 0.5-0.7 parts of triethylene glycol bridged cyclodextrin, 0.8-1.0 Parts of copper nanoparticles, 0.25-1.0 parts of sodium dodecylbenzenesulfonate, and 40-45 parts of water. The cooling device for cooling the surface of oil-based drilling fluid using this cooling medium includes: drilling fluid storage tank, primary plate cooler, secondary plate cooler, ultrasonic radiation tank, chiller; plate bundles of two plate coolers It is vertically installed; the chiller is used to cool down the cooling medium, and the chiller is connected to the ultrasonic radiation tank for ultrasonic dispersion of the cooling medium. The liquid outlet of the ultrasonic radiation tank is connected to the cooling medium inlet of the two plate coolers respectively connect. The cooling medium of the present invention is used in conjunction with the cooling device, and has the characteristics of high thermal conductivity of the medium used and small space occupation, thereby effectively preventing abnormal signals of the guiding tool and prolonging the service life of the guiding tool.

Description

technical field [0001] The invention relates to the technical field of high-temperature well drilling fluid cooling treatment, in particular to a cooling medium and a cooling device used for high-temperature well oil-based drilling fluid surface cooling treatment. Background technique [0002] Due to the deep burial and dispersion characteristics of shale gas, the recovery effect of horizontal wells is significantly better than that of vertical wells. Horizontal well drilling generally uses oil-based drilling fluid, but due to the high formation temperature, the conventional steering tool system cannot adapt to it. During drilling, abnormal tool signal transmission may occur, and even the steering tool has no signal, making drilling operations impossible. At present, no effective solution has been found in terms of the material of the steering tool itself. Therefore, in order to prevent the abnormal signal of the steering tool and prolong the service life of the steering too...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28D9/00F25B1/047C09K5/00C09K5/20
CPCC09K5/00C09K5/20F25B1/047F28D9/00
Inventor 李跃纲王琳胡俊仁王业众陶诗平谢伍平丁帆张佩玉阳强温博姜小龙柳高杰
Owner 四川页岩气勘探开发有限责任公司
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