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Special oil-soluble flocculating agent for oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid, oil-soluble technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high post-processing cost, high energy consumption, strict equipment requirements, etc.

Pending Publication Date: 2021-12-31
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the commonly used treatment methods for waste oil-based drilling fluids mainly include thermal distillation, pit sealing and burial, solvent extraction, supercritical fluid extraction, bioremediation, chemical demulsification, solidification, etc., but these methods generally consume a lot of energy and equipment Strict requirements, low operational safety, high post-processing costs and other disadvantages

Method used

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  • Special oil-soluble flocculating agent for oil-based drilling fluid and preparation method thereof
  • Special oil-soluble flocculating agent for oil-based drilling fluid and preparation method thereof
  • Special oil-soluble flocculating agent for oil-based drilling fluid and preparation method thereof

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preparation example Construction

[0051] The present invention also provides a method for preparing an oil-soluble flocculant for oil-based drilling fluid, which is used to prepare the above-mentioned oil-soluble flocculant for oil-based drilling fluid, comprising the following steps:

[0052] Step 1, according to the mass parts of 20-50 parts of base oil, 20-45 parts of water, 15-30 parts of monomer, 5-10 parts of grafted monomer, 10-30 parts of emulsifier, and 0.1-0.3 parts of initiator Weigh each raw material. Wherein, the monomer is acrylamide or its derivatives; the graft monomer is methacryloyl ethyl trimethyl ammonium chloride (DMC) or dimethyl diallyl ammonium chloride (DMDAAC) One of.

[0053] Step 2, mixing the base oil with the oil-soluble emulsifier in the emulsifier to obtain an oil phase; when there is a water-soluble emulsifier in the emulsifier, the monomer, the grafted monomer The water-soluble emulsifier in the body and the emulsifier is fully dissolved in part of the water, thereby obtaini...

Embodiment 1

[0070] A special oil-soluble flocculant for oil-based drilling fluid, the preparation method of which comprises the following steps:

[0071] Step A1. Weigh 70 g of white oil, 60 g of tap water, 10 g of deionized water, 40 g of acrylamide, 15 g of DMC, 8015 g of Span, 7 g of sodium lauryl sulfate, and 0.5 g of ammonium persulfate-sodium bisulfite.

[0072] Step A2, put white oil and Span 80 in the same mixing cup and stir to obtain the oil phase; fully dissolve acrylamide, grafted monomer DMC and sodium lauryl sulfate in part of the water to obtain the water phase ; Ammonium persulfate-sodium bisulfite is dissolved in the remaining water to obtain an initiator solution.

[0073] Step A3, drop the water phase into the oil phase drop by drop, stir at a high speed for 0.5 h, and the rotation speed of the high speed stirring is 8000 r / min, so as to obtain a pre-emulsion.

[0074] Step A4, put the pre-emulsion in a four-necked flask, and pass nitrogen gas, heat the four-necked fla...

Embodiment 2

[0076] A special oil-soluble flocculant for oil-based drilling fluid, the preparation method of which comprises the following steps:

[0077] Step B1. Weigh 80g of diesel oil, 55g of tap water, 10g of deionized water, 40g of acrylamide, 15g of DMDAAC, 8015g of Span, 3g of cetyltrimethylammonium chloride, and 0.25g of tetramethylethylenediamine-sodium sulfite.

[0078] Step B2, put diesel oil and Span 80 in the same stirring cup and stir and mix to obtain an oil phase; fully dissolve acrylamide, graft monomer DMDAAC and cetyltrimethylammonium chloride in part of the water, thereby An aqueous phase is obtained; tetramethylethylenediamine-sodium sulfite is dissolved in the remaining water to obtain an initiator solution.

[0079] Step B3, drop the water phase into the oil phase drop by drop, and stir for 1 hour at a high speed of 7000 r / min to obtain a pre-emulsion.

[0080] Step B4, put the pre-emulsion in a four-necked flask, and pass nitrogen gas, heat the four-necked flask t...

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Abstract

The invention discloses a special oil-soluble flocculant for an oil-based drilling fluid and a preparation method thereof. The special oil-soluble flocculant for the oil-based drilling fluid is prepared from the following raw materials in parts by mass: 20-50 parts of base oil, 20-45 parts of water, 15-30 parts of a monomer, 5-10 parts of a grafting monomer, 10-30 parts of an emulsifier and 0.1-0.3 part of an initiator, wherein the monomer is acrylamide or a derivative thereof; and the grafting monomer is one of methacryloyl ethyl trimethyl ammonium chloride or dimethyl diallyl ammonium chloride. According to the method, harmful solid phases in the waste oil-based drilling fluid can be selectively flocculated and precipitated, so that the oil-based drilling fluid without the flocculated precipitates can be directly added into new slurry for recycling or directly used as new slurry for recycling, the performance of an oil-based drilling fluid system is improved, the generation amount of wastes is greatly reduced, and the comprehensive cost of the drilling process is reduced.

Description

technical field [0001] The invention relates to the technical field of waste oil-based drilling fluid treatment, in particular to a special oil-soluble flocculant for oil-based drilling fluid and a preparation method thereof. Background technique [0002] Oil-based drilling fluid is an essential oilfield chemical in the drilling stage of oil and gas development. As my country's demand for petroleum resources continues to increase, the amount of waste oil-based drilling fluids in oil fields is also increasing, and a large amount of waste oil-based drilling fluids has become a heavy burden on oil fields. Waste oil-based drilling fluid contains a large amount of diesel oil / mineral oil, phenolic compounds, sediment, heavy metals and some toxic substances, which are hazardous wastes. Improper disposal will cause serious damage to surface vegetation and easily lead to pollution of soil, surface and groundwater , directly or indirectly cause great harm to the health of plants, ani...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/34C08F226/04C08F2/32C09K8/035
CPCC08F220/56C08F2/32C09K8/035C08F220/34C08F226/04
Inventor 佟拉嘎吴嘉蕾张荣月荣华
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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