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Oil-based drilling fluid flushing liquor for well cementation as well as resource recycling method and application of flushing liquor

An oil-based drilling fluid and flushing fluid technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of waste of useful resources of surfactants, environmental pollution, difficulty, etc., achieve good flushing effect, enhance Elution ability, low cost effect

Active Publication Date: 2017-10-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the used flushing fluid dissolves a large amount of oil-based drilling fluid and oil-based mud cake, if it is directly discharged, it will not only cause serious environmental pollution, but also cause useful resources such as surfactants and dissolved oil in the flushing fluid serious waste; however, if special environmental protection treatment is carried out to meet the discharge standard of national industrial waste liquid, it will not only be costly, but also difficult

Method used

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  • Oil-based drilling fluid flushing liquor for well cementation as well as resource recycling method and application of flushing liquor
  • Oil-based drilling fluid flushing liquor for well cementation as well as resource recycling method and application of flushing liquor
  • Oil-based drilling fluid flushing liquor for well cementation as well as resource recycling method and application of flushing liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Add 20 parts by weight of coconut oleic acid triethanolamide to 70 parts of seawater, stir for 30 minutes, and dissolve for 30 minutes; then add 10 parts by weight of sodium metasilicate, stir for 28 minutes, and dissolve for 60 minutes to obtain the flushing solution. Indicated in Table 2.

[0048] Washing tests were carried out on OBM-1, OBM-2, and OBM-3 using the flushing liquid, and the flushing effect is shown in Table 3. At the same time, the flushing liquid after use was obtained, and the performance and component content of the flushing liquid after flushing were shown in Table 4.

[0049] 100 parts by weight of OBM-1 to OBM-3 correspond to the base oil used, 5 parts by weight of OBM-1 to OBM-3 correspond to the main emulsifier used, and 0.5 parts by weight of OBM-1 to OBM-3 correspond to the used Co-emulsifier, stirred at 10000rpm for 20 minutes, then added 50 parts by weight of the above-mentioned flushing liquid after use, stirred for 40 minutes, then added 2...

Embodiment 2

[0051] Add 5 parts by weight of SP-20 to 92 parts of tap water, stir for 10 minutes, and dissolve for 30 minutes; then add 3 parts by weight of heptasodium diethylenetriamine pentamethylene phosphate, stir for 10 minutes, dissolve for 30 minutes, and obtain the rinse Fluid, the performance of the flushing fluid is shown in Table 2.

[0052] Washing tests were carried out on OBM-1, OBM-2, and OBM-3 using the flushing liquid, and the flushing effect is shown in Table 3. At the same time, the flushing liquid after use was obtained, and the performance and component content of the flushing liquid after flushing were shown in Table 4.

[0053] 100 parts by weight of OBM-1 to OBM-3 correspond to the base oil used, 6 parts by weight of OBM-1 to OBM-3 correspond to the main emulsifier used, and 1 part by weight of OBM-1 to OBM-3 corresponds to the used Co-emulsifier, stirred at 10000rpm for 20 minutes, then added 50 parts by weight of the above-mentioned flushing liquid after use, sti...

Embodiment 3

[0055] Add 12 parts by weight of lauric acid monoethanolamide in 80 parts of lake water, stir for 20 minutes, and dissolve for 45 minutes; then add 8 parts by weight of sodium metasilicate, stir for 20 minutes, and dissolve for 50 minutes to obtain the washing solution, and the performance of the washing solution is expressed In Table 2.

[0056] Washing tests were carried out on OBM-1, OBM-2, and OBM-3 using the flushing liquid, and the flushing effect is shown in Table 3. At the same time, the flushing liquid after use was obtained, and the performance and component content of the flushing liquid after flushing were shown in Table 4.

[0057] 100 parts by weight of OBM-1~OBM-3 correspond to the base oil used, 7 parts by weight of OBM-1~OBM-3 correspond to the main emulsifier used, and 2 parts by weight of OBM-1~OBM-3 correspond to the used Co-emulsifier, stirred at 10000rpm for 20 minutes, then added 50 parts by weight of the above-mentioned flushing liquid after use, stirre...

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PUM

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Abstract

The invention relates to oil-based drilling fluid flushing liquor for well cementation. The flushing liquor comprises a non-ionic surfactant and a salt detergent builder, wherein the HLB (hydrophile-lipophile balance) value of the non-ionic surfactant is 7-15. The invention further provides an oil-based drilling fluid which comprises base oil, a main emulsifier, used oil-based drilling fluid flushing liquor for cell cementation and a mixture of organic soil and a filtrate reducer. The flushing liquor comprises simple components, can be completely recycled after being used on the premise that good flushing efficiency is guaranteed, environmental protection is facilitated, and the oil-based drilling fluid is stable in performance, requires relatively high emulsion-breaking voltage, has a good rheological property and can completely meet performance requirements of repeated drilling.

Description

technical field [0001] The invention relates to a flushing fluid for oil-based drilling fluid cementing, and more particularly relates to a flushing fluid for oil-based drilling fluid cementing that can be completely recycled. Background technique [0002] Oil-based drilling fluid is an important technical guarantee for the drilling industry to drill deep and complex formations such as mudstone and shale, and wells with special techniques such as long horizontal wells and extended-reach directional wells. It is the preferred drilling fluid technology for the above-mentioned formations and working conditions. With the development of shale oil and gas resources and complex deep oil and gas resources, the application range and application scale of oil-based drilling fluids have been greatly improved. Different from water-based drilling fluid, after drilling with oil-based drilling fluid, it will produce dense mud cake and oil film on the well wall and casing wall of the constru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/52C09K8/36
CPCC09K8/36C09K8/52C09K8/524
Inventor 王显光李舟军林永学韩秀贞何恕李胜杨小华陈晓飞
Owner CHINA PETROLEUM & CHEM CORP
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