Oil-in-water drilling fluid suitable for different kinds of furnish preparation water and oils

An oil-in-water drilling fluid and drilling fluid technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of effective development of buried hill oil and gas reservoirs and underbalanced drilling operations, complex geological conditions, high formation temperature, etc. problems, achieve strong inhibition and anti-pollution ability, easy on-site operation, and simple treatment

Active Publication Date: 2011-08-03
CHINA OILFIELD SERVICES +1
View PDF3 Cites 23 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The buried hill reservoirs in the Bohai Bay have drilling difficulties such as deep burial, high formation temperature, complex geological conditions, and severe leakage, which have brought difficulties to the effective development of buried hill oil and gas reservoirs and underbalanced drilling operations

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
  • Oil-in-water drilling fluid suitable for different kinds of furnish preparation water and oils
  • Oil-in-water drilling fluid suitable for different kinds of furnish preparation water and oils
  • Oil-in-water drilling fluid suitable for different kinds of furnish preparation water and oils

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Measure 280ml of seawater into a high stirring cup, add 1.2g of caustic soda, stir at 10,000 rpm for 2 minutes, add 4g of supplementary milk, stir at high speed for 2 minutes, measure 120ml of gas oil and slowly add it to the cup, and stir at 10,000 rpm for high Stir for 10 minutes, add 10g of main milk, stir at 10,000 rpm for 20 minutes to make it fully emulsified, add 4g of fluid loss reducer, stir at 10,000 rpm for 10 minutes, add 2.4g of thickener, and stir at 10,000 rpm for 20 minutes, Form a stable white emulsion, the preparation is complete, and the measurement properties are as shown in Table 1:

[0044] Table 1 Example 1 prepares the performance of oil-in-water drilling fluid

[0045]

Embodiment 2

[0047] Measure 240ml of seawater into a high stirring cup, add 1.2g of caustic soda, stir at 10,000 rpm for 2 minutes, add 4g of supplementary milk, stir at high speed for 2 minutes, measure 160ml of white oil and slowly add it to the cup, stir at 10,000 rpm 10min, add 10g of main milk, stir at 10000 rpm for 20min to make it fully emulsified, add 4g fluid loss reducer, stir at 10000rpm for 10min, add 2.4g of thickener, stir at 10000rpm for 20min, and form Stable emulsion, the preparation is completed, and the measurement properties are as shown in Table 2:

[0048] The performance of table 2 embodiment 2 preparation oil-in-water drilling fluid

[0049]

Embodiment 3

[0051] This patent is implemented in a well in the Bohai Oilfield. The implementation site is a drilling platform. Before drilling, 70m of oil-in-water drilling fluid is placed in each of the two mud pools. 3 , first add 49m in the mud pool 3 sea ​​water and 21m 3 Gas to oil, then add 850kg PF-WOCOAT (secondary emulsifier) ​​and 1400kgPF-WOEMUL (main emulsifier) ​​through the addition funnel, stir thoroughly for 3 hours, then add 1300kgPF-WODFL (fluid loss reducer) and 250kgPF-WOVIS, and finally Stir again for 6 hours, the performance of measuring is as follows:

[0052] Table 3 Properties of newly prepared oil-in-water drilling fluid

[0053]

[0054] After spud drilling, use the configured oil-in-water drilling fluid to drill. During the drilling process, the drilling fluid has stable performance, strong anti-pollution ability, good performance and easy maintenance, which meets the requirements of the development of buried hill reservoirs in this block. The requirement...

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

No PUM Login to view more

Abstract

The invention discloses an oil-in-water drilling fluid suitable for different kinds of furnish preparation water and oils. The formula of the drilling fluid comprises the following components in parts by weight: 30-90 parts of seawater or fresh water, 70-10 parts of oil, 2.0-4.0 parts of main emulsifier, 0.2-0.5 part of auxiliary emulsifier, 0.5-1.5 parts of fluid loss additive, 0.5-1 part of tackifier, 0-233 parts of weighting material. By adopting the drilling fluid, the preparation requirement on different external phases (seawater and fresh water) and different internal phases (white oil and gas oil) can be met at the same time, and the application universality and operability of an oil-in-water drilling fluid system are enhanced; and the ratio of water to oil is variable between 9:1 and 3:7, the density can be lowered to 0.87 gram / cm<3>, the stratum leakage loss of a low-pressure depleted hydrocarbon reservoir and the increase in the mechanical drilling rate can be effectively prevented, the release of the hydrocarbon reservoir is facilitated, and the yield of an oil gas well is increased.

Description

technical field [0001] The invention relates to an oil-in-water drilling fluid suitable for different slurry preparations of water and oil, which is applied to offshore oil drilling engineering, especially buried hill oil and gas reservoirs with low pressure and easy leakage and underbalanced drilling. Background technique [0002] Since the 1990s, the exploration and development of oil and gas fields has become more and more difficult. The continuous exploration and development of complex oil and gas reservoirs, especially the large-area development of old oil fields with formation pressure depletion and buried hill reservoirs, is unbalanced under this situation. Drilling technology has become another development direction after horizontal well technology. At the same time, low-density drilling fluid technology has developed rapidly and has become one of the core technologies of low-pressure drilling. [0003] Due to low formation pressure and developed fractures in the bur...

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
IPC IPC(8): C09K8/28
Inventor 苗海龙王荐张荣向兴金张伟王洪伟
Owner CHINA OILFIELD SERVICES
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap