Ultra-low-temperature drilling fluid for deep sea and permafrost region drilling

A drilling fluid, ultra-low temperature technology, applied in the field of water-based drilling fluid, to achieve the effect of reducing decomposition, good compatibility and good rheology

Active Publication Date: 2017-05-31
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the deficiencies in the prior art, the object of the present invention is to provide a water-based drilling fluid, which can maintain good rheology and fluid loss under the ultra-low temperature condition

Method used

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  • Ultra-low-temperature drilling fluid for deep sea and permafrost region drilling
  • Ultra-low-temperature drilling fluid for deep sea and permafrost region drilling
  • Ultra-low-temperature drilling fluid for deep sea and permafrost region drilling

Examples

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Effect test

Embodiment 1

[0042] Embodiment 1: preparation of ultra-low temperature drilling fluid for deep-sea oil and gas drilling, including the following components by mass:

[0043] 100 parts of water, 2 parts of sodium bentonite, 2.5 parts of amino polymer, 2 parts of polyethylene glycol, 1 part of humic acid-aluminum, 0.2 parts of polyanionic cellulose PAC-HV, partially hydrolyzed polyacrylamide PHPA0. 05 parts, sulfonated phenolic resin SD-1025.5 parts, potassium chloride 4 parts, sodium chloride 25 parts, liquid lubricant SD-505 1 part, barite 20 parts.

[0044] The amine-based polymer used in this embodiment is prepared by the following method:

[0045] 330 g of diethylene glycol bis(3-aminopropyl) ether and 0.33 g of potassium hydroxide were added to a high-temperature and high-pressure reactor with a volume of 1 L, the reactor was evacuated and heated, and stirring was started at the same time at a stirring rate of 300 r / min. When the temperature was raised to 90° C., 26.4 g of ethylene ox...

Embodiment 2

[0047] Embodiment 2: preparation of ultra-low temperature drilling fluid for deep-sea gas hydrate drilling, including the following components by mass:

[0048] 100 parts of water, 2 parts of amino polymer, 1 part of polyethylene glycol, 1 part of humic acid-aluminum, 0.2 part of xanthan gum XC, 0.05 part of polyacrylamide PAM, polyanionic cellulose PAC-LV0.4 4.5 parts of sulfonated phenolic resin SD-102, 4 parts of potassium chloride, 0.5 parts of polyvinylpyrrolidone, 10 parts of sodium chloride, and 0.2 parts of lecithin.

[0049] The preparation method of the amine-based polymer used in this example is the same as that in Example 1.

[0050] The humic acid-aluminum used in the present embodiment is prepared by the following method: the mixture of 144 grams of humic acid and 211.3 grams of aluminum hydroxide and aluminum chloride (molar ratio 1: 1) in acidic conditions Reaction and synthesis at 90°C.

Embodiment 3

[0051] Example 3: preparing an ultra-low temperature drilling fluid for natural gas hydrate drilling in permafrost regions, including the following components in parts by mass:

[0052] 100 parts of water, 2.5 parts of sodium bentonite, 1 part of amino polymer, 0.5 part of polyethylene glycol, 0.8 part of humic acid-aluminum, 0.1 part of xanthan gum XC, 0.10 part of polyacrylamide PAM, polyanion fiber 0.4 parts of plain PAC-LV, 4 parts of sulfonated lignite resin, 0.5 parts of polyvinylpyrrolidone, 1 part of liquid lubricant SD-505, 20 parts of sodium chloride, and 0.2 parts of lecithin.

[0053] The amine-based polymer used in this embodiment is prepared by the following method:

[0054] Add 330 g of polyoxyethylene propylene diamine and 0.33 g of potassium hydroxide into a high-temperature and high-pressure reactor with a volume of 1 L, vacuumize the reactor, and start stirring at the same time at a rate of 300 r / min. When the temperature was raised to 90° C., 26.4 g of eth...

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Abstract

The invention discloses ultra-low-temperature drilling fluid for deep sea and permafrost region drilling. The ultra-low-temperature drilling fluid is prepared from the following components in parts by mass: 100 parts of water, 2-7 parts of a plugging-inhibition type well wall stabilizer, 0.05-0.8 part of a tackifier, 0.05-0.5 part of an encapsulating inhibitor, 1-10 parts of a filtrate loss reducer, 10-40 parts of a hydrate inhibitor, 0-1 part of lecithin, 0-4 parts of paste mud, 0-3 parts of a lubricating agent and 0-150 parts of a weighting agent. According to the drilling fluid disclosed by the invention, with physical and chemical properties of the plugging-inhibition type well wall stabilizer, the synergistic effect that a well wall is blocked and the mud shale hydration is inhibited is achieved, so that pore pressure transmission can be effectively slowed down and mud shale hydration can be inhibited, and good well wall stability can be kept in the deep sea and permafrost region drilling; good rheological behavior and filter loss performance can still be kept when the temperature is -10 DEG C; the generation of natural gas hydrates can be effectively inhibited; and the lubricating performance is good.

Description

technical field [0001] The invention relates to a drilling fluid for oil, natural gas and natural gas hydrate drilling, in particular to a water-based drilling fluid used for drilling ultra-low temperature formations in deep sea and permafrost regions. Background technique [0002] Deep sea oil, gas and gas hydrate resources are extremely rich, and permafrost regions also contain rich gas hydrate resources. Compared with land or shallow sea drilling, drilling in ultra-low temperature formations in deep sea and permafrost regions faces many special technical problems, and the drilling fluid is required to have the following properties. (1) Excellent low temperature rheology. The seafloor temperature in the Gulf of Mexico, the South my country Sea and West Africa is as low as 2-4°C. The low temperature causes the drilling fluid viscosity and shear force to rise sharply, and the oil-based drilling fluid even gels significantly, which affects the smooth progress of drilling ope...

Claims

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Application Information

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IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/12C09K2208/34
Inventor 赵欣邱正松黄维安王明亮钟汉毅徐建根
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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