Superfine oil-base drilling fluid used for high temperature high temperatur high pressure superdeep well and preparation method thereof

An oil-based drilling fluid, high temperature and high pressure technology, applied in the field of applied chemistry, can solve the problems of solidification and precipitation of heavy materials, affecting drilling and completion operations, poor rheology of the system, etc., to achieve reduced emulsifier dosage, good settlement stability and High temperature and high pressure fluid loss, good dispersion effect

Active Publication Date: 2015-05-13
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, high-density oil-based drilling fluids are generally weighted with barite and iron ore powder. Due to the high solid content, a large amount of popular regulators and shearing agents need to be added, resulting in poor rheological properties of the system, especially in high-temperature, high-pressure, ultra-deep wells ( more than 7000m), the various additives of the high-density oil-based drilling fluid weighted by ordinary barite are easily invalidated, resulting in the solidification and precipitation of the weighted material, which affects the drilling and completion operations

Method used

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  • Superfine oil-base drilling fluid used for high temperature high temperatur high pressure superdeep well and preparation method thereof
  • Superfine oil-base drilling fluid used for high temperature high temperatur high pressure superdeep well and preparation method thereof
  • Superfine oil-base drilling fluid used for high temperature high temperatur high pressure superdeep well and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Ultrafine high-density oil-based drilling fluid is prepared through the following steps:

[0038] Put 360 parts by weight of diesel oil 0# into a high stirring cup (special mixing cup for drilling fluid) and place it in a high-speed stirring state of 10,000 rpm, then add 4 parts by weight of organic soil and 8 parts by weight of emulsifier in sequence , 12 parts by weight of wetting agent, 8 parts by weight of calcium oxide, 20 parts by weight of fluid loss control agent, and then add 40 parts by weight of a 20% calcium chloride aqueous solution.

[0039] Take out half of the emulsion with the aforementioned additives for use, and add 450 parts by weight of ordinary barite and 370 parts by weight of ultra-micro barite to the remaining half of the emulsion three times, adding a part of barite each time Lotion until the end to replenish the lotion completely. In the process of preparing ultra-fine high-density oil-based drilling fluid, organic soil, emulsifier, wetting a...

Embodiment 2

[0042] Ultrafine high-density oil-based drilling fluid is prepared through the following steps:

[0043] Put 270 parts by weight of diesel oil into a high stirring cup and place it in a high-speed stirring state of 9000 rpm, add 4 parts by weight of organic soil, 5 parts by weight of emulsifier, 10 parts by weight of wetting agent, 6 parts by weight of calcium oxide, 15 parts by weight of fluid loss control agent, and then 30 parts by weight of 20% calcium chloride aqueous solution.

[0044] Take out half of the emulsion with the aforementioned additives for use, and add 660 parts by weight of ordinary barite and 500 parts by weight of ultrafine barite to the remaining half of the emulsion three times, adding a part of barite each time Lotion until the end to replenish the lotion completely. In the process of preparing ultra-fine high-density oil-based drilling fluid, organic soil, emulsifier, wetting agent, calcium oxide, and fluid loss reducer were added and stirred at high...

Embodiment 3

[0047] Ultrafine high-density oil-based drilling fluid is prepared through the following steps:

[0048]Put 270 parts by weight of diesel oil into a high stirring cup and place it in a high-speed stirring state of 10000 rpm, add 3 parts by weight of organic soil, 6 parts by weight of emulsifier, 9 parts by weight of wetting agent, 6 parts by weight of calcium oxide, 15 parts by weight of fluid loss control agent, and then 35 parts by weight of 20% calcium chloride aqueous solution.

[0049] Take out half of the emulsion with the aforementioned additives for use, and add 680 parts by weight of ordinary barite and 520 parts by weight of ultrafine barite to the remaining half of the emulsion three times, adding a part of barite each time Lotion until the end to replenish the lotion completely. In the process of preparing ultra-fine high-density oil-based drilling fluid, organic soil, emulsifier, wetting agent, calcium oxide, and fluid loss reducer were added and stirred at high ...

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Abstract

The invention provides a superfine oil-base drilling fluid used for a high temperature high pressure superdeep well, the superfine oil-base drilling fluid contains the following raw materials by weight: 20-40 parts of water, 250-500 parts of diesel, 2-10 parts of an emulsifier, 3-15 parts of a wetting agent, 2-8 parts of organic soil, 15-25 parts of a filtrate loss agent, 5-10 parts of calcium chloride, 5-10 parts of calcium oxide, 450-800 parts of API barite, and 350-660 parts of an ultra aggravating material. The oil-base drilling fluid is weighted by compounding superfine mineral powder and ordinary barite, the superfine high density oil-base drilling fluid density can reach 2.8g / cm<3>, has better settling stability and high temperature and high pressure filtration loss compared with that of ordinary barite weighted drilling fluid, and can meet drilling of deep wells, superdeep wells and composite salt formations.

Description

technical field [0001] The invention belongs to the field of applied chemistry, and in particular relates to a working fluid used for oil drilling and production and a preparation method thereof. Background technique [0002] Drilling fluid, also known as drilling flushing fluid, is a circulating flushing medium used in the drilling process. Drilling fluid is mainly composed of liquid phase, solid phase and chemical treatment agent. Commonly used drilling fluids are oil-based drilling fluids and water-based drilling fluids. Among them, the oil-based drilling fluid is a sol-suspended mixing system with oil as the dispersion medium. [0003] With the deepening of exploration and development of oil and gas resources, more comprehensive and higher requirements are put forward for the quality and performance of drilling fluid. Especially with the large-scale development of unconventional gas reservoirs marked by shale gas at home and abroad, the application of oil-based drilli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32
CPCC09K8/32
Inventor 叶艳安文华尹达
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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