Preparing process of low-cost formate drilling flushing fluid

A technology of drilling flushing fluid and preparation process, which is applied in the direction of drilling composition, chemical instruments and methods, etc., which can solve the problems of weak anti-collapse ability and narrow application range of water-based drilling fluid, and achieve the benefit of wellbore stability , Enhanced calcium pollution ability and stable performance

Inactive Publication Date: 2015-10-07
CHENGDU GAOPU PETROLEUM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of weak anti-slump ability and narrow application range of water-based drilling fluid in the prior art, and provide a positively charged polyalcohol anti-slump drilling fluid with strong anti-slump ability, relatively low cost and wide application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation process of low-cost formate drilling flushing fluid comprises the following steps:

[0031] 1) First heat the water to above 80°C, add sodium-based bentonite, and stir evenly at 600-800rpm; then stir at 6000-8000rpm for 30-40min, and then keep it at room temperature for at least 1d;

[0032] 2) Add sodium formate, coating agent for drilling fluid and inhibitor for drilling fluid in sequence at 4000-5000rpm and mix and stir for 30-60min;

[0033] 3) Then add well wall protection agent HF-GRA-II for drilling fluid, fluid loss reducer for drilling fluid, plugging agent for drilling fluid, water-based lubricant NSR-1 for drilling fluid, low fluorescence sulfonated asphalt and The viscosifier is mixed evenly;

[0034] 4) Finally, adjust the pH value to 8-9 with caustic soda, and add a weighting agent to adjust the density to 1.15-1.25g / cm 3 .

[0035] Among them, the sodium-based bentonite, 3 to 4 parts; sodium formate, 2 to 3 parts; viscosity raising agen...

Embodiment 2

[0040] The difference between this embodiment and embodiment 1 is only that the parts by weight of the components are different, and the specific settings are as follows:

[0041] As another preferred arrangement, the present invention includes the following components in parts by weight:

[0042] Sodium bentonite, 4 parts; Sodium formate, 2 parts; Viscosity enhancer, 3 parts; Inhibitor for drilling fluid, 4 parts; Well wall protection agent HF-GRA-II for drilling fluid, 2 parts; Filtration reducer for drilling fluid Coating agent for drilling fluid, 0.6 parts; Plugging agent for drilling fluid, 1 part; Water-based lubricant NSR-1 for drilling fluid, 1 part; Low fluorescence sulfonated asphalt, 2 parts; Water, 100 Parts; make the density of drilling fluid reach 1.23g / cm through deployment of weighting agent 3 .

Embodiment 3

[0044] The difference between this embodiment and embodiment 1 is that the density of the drilling fluid is different, and the density of the drilling fluid in the present embodiment is 1.20g / cm 3 .

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Abstract

The invention discloses a preparing process of low-cost formate drilling flushing fluid. The preparing process includes: 1, heating water to above 80 DEG C, adding sodium bentonite, and performing uniform mixing at the speed of 600 to 800 rpm; continuing mixing at the speed of 6000 to 8000 rpm for 30 to 40 min, and performing curing; 2, adding in order sodium formate, coating agent for drilling fluid, and inhibitor for drilling fluid, and performing mixing for 30 to 60 min; 3, adding in order well-wall protectant HF-GRA-II for drilling fluid, filtrate reducer for drilling fluid, blocking agent for drilling fluid, waterborne lubricant NSR-1 for drilling fluid, low-fluorescence sulfonated bitumen, and tackifier; and 4, adjusting pH to 8 to 9 with caustic soda, and adding weighting agent to adjust density to 1.15 to 1.25 g / cm<3>. The preparing process has the advantages such that anti-collapse ability is high, the cost is lower and the applicable range is wide.

Description

technical field [0001] The invention relates to a preparation process of drilling flushing fluid, in particular to a preparation process of low-cost formate drilling flushing fluid. Background technique [0002] Drilling fluid is the circulating flushing medium used in the hole during the drilling process. Drilling fluid is the blood of drilling, also known as drilling flushing fluid. Its main functions include cleaning the borehole, stabilizing the borehole wall, cooling the drill bit, balancing formation pressure, and lubricating the drill string and drill bit. [0003] Drilling fluid can be divided into clear water, mud, clay-free flushing fluid, emulsion, foam and compressed air according to its composition. Clear water is the earliest drilling fluid, it does not need to be treated, it is easy to use, and it is suitable for areas with complete rock formations and sufficient water sources. Mud is a widely used drilling fluid. It is mainly suitable for unstable rock for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/22
CPCC09K8/22
Inventor 周斌
Owner CHENGDU GAOPU PETROLEUM ENG TECH
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