A kind of ultra-high temperature salt-resistant drilling fluid and preparation method thereof

A drilling fluid and ultra-high temperature technology, applied in the field of water-based drilling fluid, can solve the problems of borehole diameter shrinkage, difficulty in controlling fluid loss, affecting construction quality and construction cost, etc. Easy to control, apply great effects

Active Publication Date: 2018-07-10
CHINA PETROLEUM & CHEM CORP +1
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of drilling deep wells, ultra-deep wells or formations with high geothermal gradients, the temperature at the bottom of the well can reach 200-250°C or higher. The failure of the chemical agent in the drilling fluid, serious thickening or dilution of the drilling fluid, difficulty in controlling the high-temperature and high-pressure filtration volume, etc., lead to complex well conditions such as well wall collapse, block loss, wellbore diameter shrinkage, and irregularities, which affect the construction quality and construction cost
[0003] At the beginning of the 21st century, high-temperature resistant drilling fluid technology developed rapidly at home and abroad, and a large number of drilling fluid treatment agents with a temperature resistance above 200°C were developed, and a large number of high-temperature resistant drilling fluid formulations also appeared: (1) sepiolite drilling fluid, made of Composed of saponite, sepiolite, high relative molecular mass polymer fluid loss reducer, low relative molecular mass polymer deflocculant, etc., the temperature resistance can be increased to 260 °C; (2) organic salt drilling fluid, composed of sodium formate, Potassium formate, cesium formate and other preparations are a new type of solid-free water-based drilling fluid developed in recent years. It has good compatibility with existing high-temperature treatment agents, but the disadvantage is that the cost is high
Therefore, judging from the current application of high temperature resistant drilling fluids, it is still difficult to meet the needs of drilling in high temperature saline formations.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of ultra-high temperature salt-resistant drilling fluid and preparation method thereof
  • A kind of ultra-high temperature salt-resistant drilling fluid and preparation method thereof
  • A kind of ultra-high temperature salt-resistant drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Add 0.8g of sodium carbonate to 400g of water, add 16g of sodium bentonite after the dissolution is complete, stir at high speed for 20 minutes, then place it in airtight room temperature for 24 hours. Add 4g of fluid loss additive PFL-H, 6g of fluid loss additive PFL-M, and 2g of fluid loss additive PFL-L in sequence under high stirring, and then add 8g of sulfonated phenolic resin SMP- Type II, 8g sulfonated lignite, 3g solid phase chemical cleaner ZSC-201, 12g sulfonated bitumen HQ-10, 8g lubricant SMJH-1, 1.2g sorbitan monooleate, 5g sodium hydroxide, add Stir at high speed for 20 minutes after completion, add 60g barite, stir at high speed for 10 minutes, measure rheological properties and medium pressure water loss, roll at 260°C for 16 hours, cool down to room temperature, stir at high speed for 5 minutes, measure rheological properties, medium pressure Water loss under pressure and high temperature and high pressure water loss at 180°C.

[0045] Drilling fluid ...

Embodiment 2

[0049] Add 0.7g of sodium carbonate to 400g of water, add 14g of sodium bentonite after the dissolution is complete, stir at high speed for 2 minutes, then place it in airtight room temperature for 24 hours. Add 6g of fluid loss additive PFL-H, 4g of fluid loss additive PFL-M, 4g of fluid loss additive PFL-L in sequence under high stirring, and then add 12g of sulfonated phenolic resin SMP- Type II, 12g sulfonated lignite, 3g solid phase chemical cleaner ZSC-201, 12g sulfonated bitumen HQ-10, 6g lubricant SMJH-1, 1.5g sorbitan monooleate, 6g sodium hydroxide, add Stir at high temperature for 20 minutes after completion, then add 260g of barite, stir at high speed for 10 minutes, measure rheological properties and medium pressure water loss, roll at 260°C for 16 hours, cool down to room temperature, stir at high speed for 5 minutes, measure rheological properties, Medium pressure water loss and high temperature and high pressure water loss at 180°C.

[0050] Drilling fluid pro...

Embodiment 3

[0053] Add 0.6g of sodium carbonate to 400g of water, add 12g of sodium bentonite after the dissolution is complete, stir at high speed for 20 minutes, then place it at room temperature for 24 hours in an airtight place. Add 6g of fluid loss agent PFL-H, 3g of fluid loss agent PFL-M, 6g of fluid loss agent PFL-L in turn under high stirring, and add 16g of sulfonated phenolic resin SMP- Type II, 16g sulfonated lignite, 5g solid phase chemical cleaner ZSC-201, 10g sulfonated bitumen HQ-10, 4g lubricant SMJH-1, 1.5g sorbitan monooleate, 8g sodium hydroxide, 30g After adding potassium chloride, stir at high speed for 20 minutes, then add 260g of barite, stir at high speed for 10 minutes, measure rheological properties and medium pressure water loss, roll at 240°C for 16 hours, cool down to room temperature, stir at high speed for 5 minutes, Measure rheological properties, medium pressure water loss and high temperature and high pressure water loss at 180°C.

[0054] Drilling flui...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
Login to view more

Abstract

The present invention provides an ultra-high temperature salt-resistant drilling fluid for ultra-deep well and ultra-high temperature stratum drilling, and a preparation method thereof, wherein the ultra-high temperature salt-resistant drilling fluid comprises, by weight, 100 parts of water, 1-5 parts of clay, 0.3-6 parts of a filtrate loss reducer PFL-L, 0.3-6 parts of a filtrate loss reducer PFL-M, 0.3-6 parts of a filtrate loss reducer PFL-H, 2-8 parts of a sulfonated phenol formaldehyde resin, 2-8 parts of sulfonated lignite, 0.5-4 parts of a solid-phase chemical cleaning agent, 1-6 parts of a high temperature anti-collapse blocking agent, 1-6 parts of a lubricant, 0-35 parts of salt, 0.3-2 parts of a surfactant, 1.0-4 parts of a pH value adjusting agent, and 0-200 parts of a weighting agent. According to the present invention, the ultra-high temperature salt-resistant drilling fluid is not thickened at a high temperature of more than or equal to 240 DEG C, has easily-controlled rheology and low high-temperature and high-pressure filtrate loss, can be used for bottom hole drilling construction in the high temperature (more than or equal to 240 DEG C) and high salt (saturated salt) environments, and has the good application effect.

Description

technical field [0001] The invention relates to a water-based drilling fluid in the field of petroleum and natural gas exploration and development, in particular to an ultra-high-temperature salt-resistant drilling fluid for drilling ultra-deep wells and ultra-high-temperature formations and a preparation method thereof. Background technique [0002] In the process of drilling deep wells, ultra-deep wells or formations with high geothermal gradients, the temperature at the bottom of the well can reach 200-250°C or higher. The failure of the chemical agent in the drilling fluid, serious thickening or dilution of the drilling fluid, and difficulty in controlling the high-temperature and high-pressure filtration volume will cause complex well conditions such as well wall collapse, block loss, wellbore diameter shrinkage, and irregularities, which will affect the construction quality and construction cost. [0003] At the beginning of the 21st century, high-temperature resistant...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24
Inventor 杨小华林永学王琳王治法钱晓琳李胜
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products