A temperature-resistant 250°C organic salt drilling fluid and its preparation method

An organic salt and drilling fluid technology, applied in the field of oil field drilling fluid, can solve the problems of not being able to take into account environmental protection and safety, and the environment is not very friendly, and achieve the effects of good filtration loss wall building, environmental friendliness, and good rheology

Active Publication Date: 2022-03-18
北京培康佳业技术发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drilling fluid system has good rheology, and can maintain stable performance under long-term high temperature conditions. The disadvantage is that the sulfonated fluid loss control agent is used in the system, which is not very friendly to the environment, and the drilling fluid system has the highest density. Can only reach 1.5g / cm 3 , not suitable for high-density drilling under high pressure
[0005] In short, the current high-temperature-resistant drilling fluid system cannot meet the special environmental requirements of deep and ultra-deep wells such as high density, high temperature, and high salinity at the same time, and cannot take into account environmental protection and safety

Method used

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  • A temperature-resistant 250°C organic salt drilling fluid and its preparation method
  • A temperature-resistant 250°C organic salt drilling fluid and its preparation method
  • A temperature-resistant 250°C organic salt drilling fluid and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] According to the weight ratio, 0.3 part of anhydrous sodium carbonate, 1 part of sodium hydroxide and 5 parts of Visco1 were added to 100 parts of water, and stirred at a high speed for 20 minutes to obtain a base slurry.

[0047] Add 8 parts of Redu200 to the base slurry and stir at high speed for 20 minutes; then add 6 parts of Redu2, 3 parts of NFA-25 and 2 parts of PGCS-1, and stir at high speed for 20 minutes; then add 150 parts of Weigh3B and stir at high speed for 20 minutes to obtain an organic salt drilling fluid.

[0048] Organic salt drilling fluid formula is recorded as:

[0049] Water+0.3%Na 2 CO 3 +1%NaOH+5%Visco1+8%Redu200+3%NFA-25+2%PGCS-1+6%Redu2

[0050] +150%Weigh3B.

Embodiment 2

[0052] The difference from Example 1 is that the formula is:

[0053] Water+0.3%Na 2 CO 3 +1%NaOH+5%Visco1+9%Redu200+3%NFA-25+2%PGCS-1

[0054] +2%ReduSH+4%Redu2+20%Weigh2+50%Weigh3+110%Barite.

Embodiment 3

[0056] The difference from Example 1 is that the formula is:

[0057] Water+0.3%Na 2 CO 3 +1%NaOH+3%Visco1+10%Redu200+2%NFA-25

[0058] +1%PGCS-1+2%ReduSH+5%Redu2+20%Weigh2+70%Weigh3+200%Barite.

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Abstract

The invention discloses an organic salt drilling fluid with a temperature resistance of 250°C and a preparation method thereof. The drilling fluid includes water, shearing agent modified silicate Visco1, soda ash, caustic soda, salt and high temperature resistance fluid loss reducer, normal temperature Fluid loss agent, anti-slump inhibitor non-fluorescent white asphalt NFA‑25, lubricant, water-soluble aggravation inhibitor organic salt, barite. The drilling fluid system is 1.4~2.5g / cm 3 Under the condition of low density, the temperature resistance can reach 250 ℃, and the inhibition is strong, and the anti-salt and anti-calcium effect is good. It is suitable for drilling construction in complex formations such as deep wells, ultra-deep wells and salt-gypsum layers. In addition, the drilling fluid is easy to degrade and has no biological and chemical toxicity, which ensures the environmental protection and safety of the drilling fluid and reduces the damage to deep formations.

Description

technical field [0001] The invention relates to the technical field of oil field drilling fluid, in particular to an organic salt drilling fluid with a temperature resistance of 250°C and a preparation method thereof. Background technique [0002] With the development of domestic and foreign petroleum industries and the increasing demand for petroleum, the exploration and development of oil and gas fields are gradually developing towards deeper formations. Drilling practice shows that with the increase of well depth, drilling technical difficulties gradually increase, and the geological environment of high temperature and high pressure downhole seriously affects the performance of drilling fluid. The main performance is that the viscosity of the drilling fluid is not easy to control under the condition of high temperature and high density, the fluid loss is large, the solid phase content is high, and the anti-pollution performance is poor. Especially when drilling complex s...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C09K8/06C09K8/12C09K8/08
CPCC09K8/06C09K8/12C09K8/08C09K2208/12
Inventor姚少全李君勋
Owner北京培康佳业技术发展有限公司