A deep-water water-based drilling fluid and its application

A water-based drilling fluid and deep-water water-based technology, which can be used in underwater drilling, earth-moving drilling, flushing wells, etc., and can solve problems such as reservoir damage

Active Publication Date: 2020-09-18
YANGTZE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Chinese patents CN201010161656.3 and CN201310501155.9 respectively proposed two deep-water water-based constant rheological drilling fluids, but the above-mentioned drilling fluids are easy to cause damage to the reservoir

Method used

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  • A deep-water water-based drilling fluid and its application
  • A deep-water water-based drilling fluid and its application
  • A deep-water water-based drilling fluid and its application

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preparation example Construction

[0025] In terms of mass percentage, the deep-water water-based drilling fluid provided by the present invention includes 0.5% to 3.5% fluid loss control agent, more preferably 1% to 3.0%. In the present invention, the fluid loss control agent is preferably modified starch. In the present invention, the preparation method of the fluid loss control agent preferably includes:

[0026] Mix the starch raw material, alkali, haloacetic acid and water, and carry out modification reaction to obtain the mixture;

[0027] Expanding and modifying the mixture at 95-105°C to obtain expanded starch;

[0028] The expanded starch is refined to obtain modified starch.

[0029] In the present invention, the starch raw material, alkali, halogenated acetic acid and water are preferably mixed to obtain a mixture. In the present invention, in terms of parts by mass, the starch raw material in the mixture preferably includes 80-110 parts, more preferably 88-103 parts. In the present invention, th...

Embodiment 1

[0048] In terms of mass percentage, the composition of deepwater water-based drilling fluid: 0.1% viscosifier, 0.1% alkalinity regulator, 3.5% fluid loss control agent, 1.5% low temperature flow pattern regulator, 5.0% shale inhibitor, 15% % hydrate inhibitor, 1.0% lubricant, 10.0% temporary plugging agent and the balance of seawater, of which:

[0049] Thickener: xanthan gum, coriander gum, konjac gum, guar gum and thorny bean gum are mixed at a mass ratio of 40:20:10:5;

[0050] Alkalinity regulator: sodium hydroxide;

[0051] Filtrate reducer: modified starch, prepared according to the following method: 50 parts by mass of potato starch, 20 parts by mass of tapioca starch, 20 parts by mass of canna starch, 1 part by mass of sodium hydroxide, 5 parts by mass of haloacetic acid and 150 parts by mass of After mixing parts by mass of deionized water evenly, pour it into the screw extruder, control the temperature at 100°C, extrude the raw material mixture from the outlet of th...

Embodiment 2

[0060] In terms of mass percentage, the composition of deepwater water-based drilling fluid: 0.5% viscosifier, 0.5% alkalinity regulator, 1.5% fluid loss reducer, 0.5% low temperature flow pattern regulator, 1.0% shale inhibitor, 25% % hydrate inhibitor, 3.0% lubricant, 5.0% temporary plugging agent and the balance of seawater, of which:

[0061] Tackifier: xanthan gum;

[0062] Alkalinity regulator: sodium hydroxide and sodium carbonate are mixed according to the mass ratio of 1:3;

[0063] Filtrate reducer: modified starch: 40 parts by mass of potato starch, 30 parts by mass of tapioca starch, 30 parts by mass of canna starch, 2 parts by mass of sodium hydroxide, 10 parts by mass of haloacetic acid and 120 parts by mass of deionized water After uniformity, it was prepared according to the method of Example 1, except that the temperature of the screw extruder was controlled at 95°C;

[0064] Low temperature flow regulator: polyethylene glycol fatty acid ester;

[0065] Sha...

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Abstract

The invention belongs to the technical field of petroleum drilling engineering. The invention provides a deep-water water-based drilling fluid and its application. In terms of mass percentage, it includes: 0.1% to 1.0% viscosity enhancer, 0.1% to 1.0% alkalinity adjustment Agent, 0.5%~3.5% fluid loss additive, 0.5%~1.5% low temperature flow regulator, 1.0%~5.0% shale inhibitor, 15%~25% hydrate inhibitor, 1.0%~3.0% lubricant , 5.0% ~ 10.0% temporary plugging agent and the balance of seawater. The deep-water water-based drilling fluid provided by the invention has constant rheology and reservoir protection properties.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling engineering, and in particular relates to a deep-water water-based drilling fluid and its application. Background technique [0002] There is a large amount of unexploited oil in the ocean, especially the deep-water oil reserves in the ocean are even more amazing. With the increasing demand for energy in the society, offshore oil and gas exploration has gradually moved towards deep water, which is often accompanied by high pressure and low temperature, and it is close to 0°C near the seabed mud line, which brings great challenges to deep water and ultra-deep water drilling projects. a huge challenge. Deepwater and ultra-deepwater drilling is faced with problems such as gas hydrate blockage of pipelines, formation undercompaction near the mudline, and low fracture pressure. It is very likely that the drilling failure will be caused by pressure leakage in the formation, and after return...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/08C09K8/12C08B31/12
CPCC09K8/08C09K8/12C08B31/12C09K2208/34C09K2208/22E21B21/001C09K8/514C09K2208/12C09K8/52E21B7/12
Inventor 许明标李中由福昌李炎军刘和兴周姗姗
Owner YANGTZE UNIVERSITY
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