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Drilling fluid for natural gas hydrate stratum in sea area as well as preparation method and application of drilling fluid

A natural gas and hydrate technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as unseen invention patents, and achieve the effects of solving wellbore instability, increasing mechanical speed, and improving plugging effect.

Active Publication Date: 2022-03-01
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research and development of natural gas hydrate drilling fluid systems in sea areas is still in its infancy, and there are no invention patents that address the above three technical problems and have good effects

Method used

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  • Drilling fluid for natural gas hydrate stratum in sea area as well as preparation method and application of drilling fluid
  • Drilling fluid for natural gas hydrate stratum in sea area as well as preparation method and application of drilling fluid
  • Drilling fluid for natural gas hydrate stratum in sea area as well as preparation method and application of drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] This embodiment provides a preparation method of drilling fluid for natural gas hydrate formations in sea areas, and the specific steps are as follows:

[0065] (1) Stir the seawater of 100 mass parts in 3800 rpm high-speed mixer, add the bentonite of 3 mass parts and mix and stir for 90 minutes, leave standstill for 24 hours,

[0066] (2) the mixture that step (1) obtains is stirred in 4000 rev / min high-speed stirrer for 10 minutes, then adds 1 weight part of sodium carboxymethylcellulose Na-CMC, stirs in 4500 rev / min high-speed stirrer 20 minutes;

[0067] (3) Add 2.5 parts by weight of modified starch, 2 parts by weight of nano silicon dioxide, 1 part by weight of polyvinylpyrrolidone K90, 2 parts by weight of potassium chloride KCl, 1 part by weight of the mixture obtained in step (2) every 15 minutes. Parts of modified lecithin, then stirred for 30 minutes at 5000 rpm in a high-speed stirrer;

[0068] A drilling fluid A1 for natural gas hydrate formations in sea ...

Embodiment 2

[0070] This embodiment provides a preparation method of drilling fluid for natural gas hydrate formations in sea areas, and the specific steps are as follows:

[0071] (1) Stir the seawater of 100 mass parts in 3800 rpm high-speed mixer, add the bentonite of 2.5 mass parts and mix and stir for 90 minutes, leave standstill for 24 hours,

[0072] (2) The mixture obtained in step (1) was stirred in a high-speed stirrer at 4000 rpm for 10 minutes, then added 0.7 parts by weight of sodium carboxymethylcellulose Na-CMC, and stirred in a high-speed stirrer at 4500 rpm 20 minutes;

[0073] (3) Add 1.5 parts by weight of modified starch, 1.5 parts by weight of nano silicon dioxide, 1 part by weight of polyvinylpyrrolidone K90, 1.5 parts by weight of potassium chloride KCl, 0.7 parts by weight of the mixture obtained in step (2) every 15 minutes. Parts of modified lecithin, then stirred for 30 minutes at 5000 rpm in a high-speed stirrer;

[0074] A drilling fluid A2 for natural gas hy...

Embodiment 3

[0076] This embodiment provides a preparation method of drilling fluid for natural gas hydrate formations in sea areas, and the specific steps are as follows:

[0077] (1) Stir the seawater of 100 mass parts in 3800 rpm high-speed mixer, add the bentonite of 4 mass parts and mix and stir for 90 minutes, leave standstill for 24 hours,

[0078] (2) The mixture obtained in step (1) was stirred for 10 minutes in a 4000 rev / min high-speed stirrer, then 2.5 parts by weight of sodium carboxymethylcellulose Na-CMC was added, stirred in a 4500 rev / min high-speed stirrer 20 minutes;

[0079] (3) Add 3.5 parts by weight of modified starch, 3 parts by weight of nano silicon dioxide, 1.5 parts by weight of polyvinylpyrrolidone K90, 2.5 parts by weight of potassium chloride KCl, 2 parts by weight of the mixture obtained in step (2) every 15 minutes. Parts of modified lecithin, then stirred for 30 minutes at 5000 rpm in a high-speed stirrer;

[0080] A drilling fluid A3 for natural gas hyd...

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Abstract

The invention provides a drilling fluid for a natural gas hydrate stratum in a sea area as well as a preparation method and application of the drilling fluid. The drilling fluid is prepared from the following components: seawater, bentonite, a flow pattern regulator, modified starch, a hydrate generation inhibitor, halide salt and a hydrate decomposition inhibitor, wherein every 100 parts by weight of seawater contains 2-5 parts by weight of bentonite, 0.5-3 parts by weight of a flow pattern regulator, 1-4 parts by weight of modified starch, 2-6 parts by weight of a hydrate generation inhibitor, 1-3 parts by weight of halide salt and 0.5-2.5 parts by weight of a hydrate decomposition inhibitor. When the drilling fluid is drilled into a stratum containing natural gas hydrate, the drilling fluid has relatively good well wall stabilizing capability and relatively strong capability of inhibiting decomposition and generation of the natural gas hydrate, and the drilling safety of the natural gas hydrate in a sea area can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate drilling, in particular to a drilling fluid for natural gas hydrate formations in sea areas, a preparation method and application thereof. Background technique [0002] Natural gas hydrate is a crystalline compound with a cage structure formed by water and natural gas molecules under high pressure and low temperature conditions. It is mainly distributed in marine sediments and permafrost regions, and its reserves far exceed traditional fossil energy. Natural gas hydrate has high energy density and clean combustion. It is regarded as an alternative potential clean energy source, and has attracted extensive attention from governments, enterprises and scientific research institutes. [0003] Multiple test production practices in China and Japan have proved that the drilling of vertical and horizontal wells for natural gas hydrate in sea areas mainly faces three major technical problems: (...

Claims

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Application Information

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IPC IPC(8): C09K8/22
CPCC09K8/22C09K2208/12C09K2208/22C09K2208/10
Inventor 王韧刘继亮王建龙汪奇兵刘天乐程荣超屈沅治张志磊王金堂孙金声
Owner BC P INC CHINA NAT PETROLEUM CORP