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Flow pattern regulator for oil-based drilling fluid and preparation method

A flow pattern regulator, oil-based drilling fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem that the rheological properties of the system are difficult to adjust, the oil-based drilling fluid is thickened at high temperature, and the shearing effect is poor. and other problems, to achieve the effect of improving drilling quality and speed, reducing viscosity and chemical stability

Pending Publication Date: 2020-08-25
北京中科日升科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the poor cutting effect of the existing technology, a large amount of flow regulator needs to be added, which may easily lead to high-temperature thickening of the oil-based drilling fluid and excessive viscosity cutting, making it difficult to adjust the rheological properties of the system; or the technology is difficult and difficult to realize At present, there is still a lack of flow pattern modifiers with excellent thixotropic properties in oil-based drilling fluids, so as to continuously meet the increasing requirements for static suspended sand and dynamic sand-carrying in existing drilling fluid projects

Method used

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  • Flow pattern regulator for oil-based drilling fluid and preparation method
  • Flow pattern regulator for oil-based drilling fluid and preparation method
  • Flow pattern regulator for oil-based drilling fluid and preparation method

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Experimental program
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Effect test

Embodiment 1

[0028] The present embodiment provides a flow conditioner for oil-based drilling fluids, including the following raw materials by weight: 7.5 kg of isocyanate (MDI-50, Wanhua Chemical), 75 kg of polyether polyol (C2020, Wanhua Chemical), Molecular amine compound (p-phenylenediamine, Shanghai Bangcheng Chemical) 3kg, catalyst (organotin, T12, American Gas Chemical) 0.1kg, 14.4kg solvent (150# solvent oil, Wuxi Yongzhen).

[0029] Add 75kg of polyether polyol and 14.4kg of solvent into the reaction kettle, heat up to 130°C under vacuum for 2 hours with high-speed stirring; reduce the temperature to below 50°C, add 3kg of small molecular amine compounds, and stir for 0.5 hours; Slowly add 7.5kg of isocyanate while stirring, react for 1 hour, then heat up to 80°C and stir to react for 1 hour; add 0.1kg of catalyst, continue to stir and react for 2 hours; cool to below 50°C, and discharge to obtain the product.

Embodiment 2

[0031] The present embodiment provides a flow conditioner for oil-based drilling fluid, which includes the following raw materials by weight: 4.8 kg of isocyanate (TDI, Cangzhou Dahua), 54.2 kg of polyether polyol (DL-1000D, Shandong Dongda), Small molecular amine compound (diaminodiphenyl ether, Nantong Runfeng Petrochemical) 0.5kg, catalyst (organic bismuth, Bicat8118, American leading chemical) 0.5kg, 40kg solvent (5# white oil, Maoming Petrochemical)

[0032] Add 54.2kg of polyether polyol and 40kg of solvent into the reaction kettle, heat up to 100°C with high-speed stirring and dehydrate for 4 hours under vacuum conditions; reduce the temperature to below 50°C, add 0.5kg of small molecular amine compounds, and stir for 10 minutes; then Slowly add 4.8kg isocyanate while stirring, react for 2 hours, then heat up to 60°C and stir for 2 hours; add 0.5kg of catalyst, continue stirring for 1 hour; cool to below 50°C, and discharge to obtain the product.

Embodiment 3

[0034] This embodiment provides a flow conditioner for oil-based drilling fluid, including the following raw materials by weight: 7kg of isocyanate (IPDI, Covestro), 74kg of polyether polyol (C2020, Wanhua Chemical), and 74kg of small molecular amines. Compound (diaminodiphenyl ether, Shanghai Bangcheng Chemical) 5kg, catalyst (organic zinc, Bicat Z, Shanghai Deyin Chemical) 0.1kg, 13.9kg solvent (5# white oil, Maoming Petrochemical).

[0035] Add 74kg of polyether polyol and 13.9kg of solvent into the reaction kettle, heat up to 120°C under vacuum for 3 hours with high-speed stirring; reduce the temperature to below 50°C, add 5kg of small molecular amine compounds, and stir for 20 minutes; Slowly add 7kg of isocyanate while stirring, react for 2 hours, then heat up to 70°C and stir to react for 2 hours; add 0.1kg of catalyst, continue to stir and react for 2 hours; cool down to below 50°C, and discharge to obtain the product.

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Abstract

The invention discloses a flow pattern regulator for an oil-based drilling fluid and a preparation method. The flow pattern regulator comprises the following raw materials in parts by weight: 4-8 parts of isocyanate, 50-85 parts of polyether polyol, 0.5-5 parts of a small molecular amine compound, 0.1-0.5 part of a catalyst and 5-40 parts of a solvent. The flow pattern regulator for the oil-baseddrilling fluid in the invention has good sand suspending capacity at a low shearing rate; under the condition of a high shearing rate, the flow pattern regulator has good dynamic sand carrying capacity, is beneficial for a rapid drilling stage, keeps a well in a good clean state and improves drilling quality and drilling speed; and the flow pattern regulator is particularly applicable as a flow pattern regulator in oil-based drilling fluid systems with high requirements on static sand suspending and dynamic sand carrying, such as horizontal wells and extended reach wells.

Description

technical field [0001] The invention belongs to the technical field of drilling treatment agents, and in particular relates to a flow-pattern regulator for oil-based drilling fluids and a preparation method. Background technique [0002] Oil-based drilling fluids have many advantages, such as high temperature resistance, salt resistance, good wellbore stability, good lubricity and less damage to oil and gas formations, and have been widely used at home and abroad. However, due to environmental, cost, safety and other factors, oil-based drilling fluids are generally used in shale gas development wells, difficult wells where the well wall is prone to collapse and instability, highly deviated wells and extended reach wells. Such wells generally face a narrow pressure window, the wellbore is prone to collapse and instability, and the wellbore is difficult to clean. This requires the oil-based drilling fluid not only to have a good wellbore stabilization effect, but also to have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/28C09K8/035C09K8/32
CPCC08G18/6685C08G18/48C08G18/4804C08G18/324C08G18/3243C08G18/2865C09K8/035C09K8/32
Inventor 李红英王伟彭春耀权换哲张云雷冯理琼张永建
Owner 北京中科日升科技有限公司
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