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A kind of ultra-low temperature drilling fluid for deep sea and permafrost drilling

A drilling fluid and ultra-low temperature technology, applied in the field of water-based drilling fluid, to achieve the effects of avoiding wellbore instability, good compatibility, and good rheology

Active Publication Date: 2019-04-09
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 conditions of oil gas and natural gas hydrate drilling in deep sea and permafrost regions, and improve the well wall. Stability, inhibition of natural gas hydrate formation to cause blockage of wellbore and pipeline problems, etc.

Method used

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  • A kind of ultra-low temperature drilling fluid for deep sea and permafrost drilling
  • A kind of ultra-low temperature drilling fluid for deep sea and permafrost drilling
  • A kind of ultra-low temperature drilling fluid for deep sea and permafrost 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 an ultra-low temperature drilling fluid for deep sea and permafrost drilling. It includes the following components by mass: 100 parts of water, 2-7 parts of "plug-inhibition" type well wall stabilizer, 0.05-0.8 part of viscosifier, 0.05-0.5 part of coating inhibitor, fluid loss reducer 1 to 10 parts, 10 to 40 parts of hydrate inhibitor, 0 to 1 part of lecithin, 0 to 4 parts of compounding soil, 0 to 3 parts of lubricant, and 0 to 150 parts of weighting agent. The drilling fluid of the present invention utilizes the physical and chemical properties of the "blocking-inhibiting" well wall stabilizer to block the well wall and inhibit the shale hydration synergistically, which can effectively block the transmission of pore pressure and inhibit the shale hydration , can maintain excellent wellbore stability in drilling in deep sea and permafrost regions; maintain good rheology and fluid loss at temperatures as low as -10°C; can effectively inhibit the formation of natural gas hydrate; and have excellent lubricity.

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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Patent Type & Authority Patents(China)
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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