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
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  • 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, an

Method used

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  • 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

Example Embodiment

[0042] Example 1:

[0043] Measure 280ml of seawater and place it in a high stirring cup, add 1.2g of caustic soda, stir at 10,000 rpm for 2 minutes, add 4g of auxiliary milk, measure at high stirring for 2 minutes, measure 120ml of gas oil and slowly add it to the cup at 10,000 rpm Stir for 10min, add 10g of main milk, stir at 10000rpm for 20min, make it fully emulsified, add 4g fluid loss agent, stir for 10min at 10000rpm, add 2.4g thickener, stir at 10000rpm for 20min, A stable white emulsion is formed, the preparation is completed, and the measurement performance is shown in Table 1:

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

[0045]

Example Embodiment

[0046] Example 2:

[0047] Measure 240ml of sea water and place it in a high stirring cup, add 1.2g of caustic soda, stir at 10,000 rpm for 2 minutes, add 4g of auxiliary milk, measure at high stirring for 2 minutes, measure 160ml of white oil and slowly add it to the cup, stir at 10,000 rpm 10min, add 10g main milk, 10000rpm high stirring for 20min, make it fully emulsified, add 4g fluid loss agent, 10000rpm high stirring for 10min, add 2.4g thickener, 10000rpm high stirring for 20min, form Stable emulsion, after preparation, the measurement performance is shown in Table 2:

[0048] Table 2 Example 2 Preparation of oil-in-water drilling fluid performance

[0049]

Example Embodiment

[0050] Example 3:

[0051] This patent was implemented in a well in Bohai Oilfield. The implementation site was a drilling platform. Before drilling, 70m of oil-in-water drilling fluid was configured 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 (auxiliary emulsifier) ​​and 1400kg PF-WOEMUL (primary emulsifier) ​​through the feeding funnel, fully stir for 3 hours, then add 1300kg PF-WODFL (filtrate reducer) and 250kg PF-WOVIS, and finally After stirring for 6 hours, the measured performance is as follows:

[0052] Table 3 Performance of newly formulated oil-in-water drilling fluid

[0053]

[0054] After drilling, use the configured oil-in-water drilling fluid for drilling. During the drilling process, the drilling fluid has stable performance and strong anti-pollution ability. It shows good performance and easy maintenance, which satisfies the development of buried hill reservoirs in this block. The requir...

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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

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Application Information

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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
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