Oilfield profile control agent and preparation method thereof

A profile control agent, oil field technology, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of fast water absorption and expansion of particles, loss of water plugging and profile control effect, and volume reduction of water injection wave, so as to improve oil recovery. Time, reduce oil production costs, and avoid construction waste.

Inactive Publication Date: 2018-09-04
TANGSHAN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this kind of water plugging and profile control particles are used in deep water displacement, some problems arise, mainly because the particles absorb water and expand quickly, and they have already begun to expand before they are pumped into the well pipe in the surface liquid distribution tank, so they are not easy to transport to In deeper formations, in addition, due to the low strength of water blocking particles and the expansion in advance, the strength drops significantly, so that during the pumping process, the shearing bulk particles passing through

Method used

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Examples

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preparation example Construction

[0029] The present invention also provides the preparation method of above-mentioned oil field profile control agent, comprises the following steps:

[0030] (1) dehydrating the polyester polyol to obtain dehydrated polyester polyol;

[0031] (2) keeping the dehydrated polyester polyol and the hexamethylene diisocyanate at 79-96° C. for 1-5 hours to obtain a polyurethane prepolymer;

[0032] (3) Cool down the polyurethane prepolymer to below 35°C, mix it with the solvent and the chloroprene rubber, raise the temperature of the obtained mixture to 40-45°C within 5-20 minutes, and pour it into the mixture Add the sealing agent dropwise, control the dropping time to 0.5-20 hours, keep warm for 3-9 hours, then add the plasticizer, the catalyst and the solvent, and stir for 0.5-1 hour to obtain oil field profile control agent.

[0033] In the present invention, there is no special limitation on the dehydration method of polyester polyol, and the dehydration can be carried out by ...

Embodiment 1

[0039] Add 48wt% polyester polyol (PE) into the reaction kettle, raise the temperature to 120 degrees Celsius, and dehydrate under vacuum for 30 minutes. After cooling down to 40 degrees Celsius, 8 wt% hexamethylene diisocyanate (HDI) was added, the temperature was controlled at 85 degrees Celsius, and the temperature was kept for 2.5 hours. Cool down to 25 degrees Celsius, add 15wt% xylene and 10wt% chloroprene rubber in turn, heat up to 40 degrees Celsius in 5 minutes, add 8wt% ethyl lactate dropwise, control the dropping time for 0.5 hours, keep warm for 3 hours, then add 2wt% Acetone, 7wt% dibutyl phthalate and 2wt% triethylenediamine are stirred for 0.5 hours, cooled to below 40 degrees Celsius, released from the reaction kettle, filled into iron packaging drums, and become the oilfield profile control agent. The physical and chemical indicators of the product are shown in Table 1:

[0040] Table 1 Example 1 Oilfield profile control agent physical and chemical indicators...

Embodiment 2

[0046] Add 50wt% polyester polyol (PE) into the reaction kettle, raise the temperature to 120 degrees Celsius, and dehydrate under vacuum for 30 minutes. After cooling down to 40 degrees Celsius, 10 wt% hexamethylene diisocyanate (HDI) was added, the temperature was controlled at 85 degrees Celsius, and the temperature was kept for 2.5 hours. Cool down to 35 degrees Celsius, add 12wt% xylene and 8wt% neoprene in sequence, heat up to 40 degrees Celsius in 5-20 minutes, add 8wt% caprolactam dropwise, control the dropping time for 12 hours, and keep warm for 7 hours, then add 3wt% % acetone, 7wt% dibutyl phthalate, 2wt% dibutyltin diethylhexanoate, stir for 1 hour, cool down to below 40 degrees Celsius, release from the reaction kettle, and fill it into an iron packaging barrel, which is the oil field Profile control agent. The physical and chemical indicators of the product are shown in Table 2:

[0047] Table 2 Example 2 Oilfield profile control agent physical and chemical in...

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PUM

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Abstract

The invention relates to the technical field of oilfield chemistry and oil extraction, and discloses an oilfield profile control agent and a preparation method thereof. The oilfield profile control agent comprises the following components in parts by mass: 28-62 parts of polyester polyol, 4-42 parts of hexamethylene diisocyanate, 2-41 parts of chloroprene rubber, 0.01-3 parts of a catalyst, 2-45 parts of a blocking agent, 1-31 parts of a solvent and 1-20 parts of a plasticizer. A polyurethane prepolymer is prepared by the polymerization of the polyester polyol and the hexamethylene diisocyanate, and then a blocking reaction is carried out on the blocking agent with the polyurethane prepolymer, the solvent, the chloroprene rubber, the plasticizer and the catalyst, so that the oilfield profile control agent provided by the invention is obtained. The product is in a liquid state at normal temperature, can fully enter into the deep micro pores of a stratum, and gels and expands in the stratum; the gelling temperature is controllable, so that the diversion function of the profile control liquid flow of a deep oil reservoir can be realized; the flood conformance volume is increased; thewater flooding effect is improved; and the recovery efficiency is improved.

Description

technical field [0001] The invention relates to the technical fields of oilfield chemistry and oil recovery, in particular to an oilfield profile control agent and a preparation method thereof. Background technique [0002] Most of my country's oilfield production is carried out by water flooding. The water content of the old oilfields in the east exceeds 90%, and the production decline is getting faster and faster. Water plugging and profile control technology has always been an effective means for oilfields to improve water flooding development effects and achieve stable production of oil reservoirs. Swelling particles are a product developed in recent years. Used for profile control of water wells, they can effectively improve water flooding effect, increase water injection swept volume, reduce oil water content, and increase oil recovery. However, when this kind of water plugging and profile control particles are used in deep water displacement, some problems arise, mai...

Claims

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Application Information

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IPC IPC(8): C09K8/508C08G18/42C08G18/73
CPCC08G18/42C08G18/73C09K8/5083C09K8/5086
Inventor 张建生赵玥刘大成杨洋张素娟李海花
Owner TANGSHAN COLLEGE
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