Viscosity-reduction, profile-control and oil-displacement oil well additive, oil well combination treating agent and application thereof

A treatment agent and oil well technology, applied in the direction of drilling composition, wellbore/well components, chemical instruments and methods, etc., can solve the problems of no correlation, etc., and achieve the effect of reducing interfacial tension and strong foaming ability

Active Publication Date: 2013-06-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently popular domestic construction methods and chemi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In a heavy oil well, the oil layer is 25 meters thick and has 5 layers. The viscosity of crude oil is 7520mPa.s. Due to repeated throughput, the effect becomes worse round by round.

[0043] During construction, first squeeze in auxiliary agent: 60 tons of mixed solution of commercially available NP-15 (nonylphenol polyoxyethylene ether) 10% wt% and commercially available AES (fatty alcohol polyoxyethylene ether sodium sulfate) 15% wt% , intermediate isolation 10 tons of 10%wt% auxiliary agent (commercially available OBS (sodium perfluorononenyloxybenzene sulfonate) 5%wt%, alcohol (methanol) 50%wt%, ammonium chloride 1-2%, Sodium nitrite 1-2%, all the other are water), then squeeze into 10 tons of additives with steam by steam injection point, steam consumption 3000 cubic meters. Stew well for 3 days. After the well was opened, compared with the same period, the daily increase of oil was 5 tons, and the daily increase of liquid was 18 cubic meters, and the effect was ...

Embodiment 2

[0049] In a heavy oil well, the oil layer is 10.5 meters thick and has 3 layers. The viscosity of crude oil is 6570mPa.s, and it has been processed for 14 rounds. Due to repeated processing, the effect becomes worse with each round.

[0050] During construction, with described auxiliary agent formula (commercially available sodium perfluorononenyloxybenzene sulfonate 1%; Alcohol (ethanol) 10%; Ammonium chloride 1%; Sodium nitrite 1-2%; Surplus is water , said percentage is weight percentage) 30 tons, squeeze into formation with steam 2000 square with high temperature and high pressure drip pump. Stew well for 5 days. After the well was opened, compared with the same period, the daily increase of oil was 2 tons, and the daily increase of liquid was 9 cubic meters, and the effect was obvious.

[0051] The auxiliary agent of the present embodiment is detected:

[0052] (1) Measured by the air flow method, the half-life of the foam at 55°C and normal pressure is 2560s, and the ...

Embodiment 3

[0056] In a heavy oil well, the thickness of the oil layer is 15.5 meters, and there are 4 layers. The crude oil has a viscosity of 4270mPa.s and has been pumped and pumped for 12 rounds. Due to repeated pumping and pumping, the effect becomes worse with each round.

[0057] During construction, first extrude 60 tons of adjuvant 5% wt% of commercially available NP-15 (nonylphenol polyoxyethylene ether) and commercially available AES (fatty alcohol polyoxyethylene ether sodium sulfate) 10% wt% , then squeeze into 15 tons of additives (commercially available OBS (sodium perfluorononenyloxybenzenesulfonate)) 5%wt%, alcohol (isopropanol) 50%wt%, ammonium chloride 2wt%, sodium nitrite 2wt%, the rest is water), and then inject 2500 square meters of steam. Stew well for 3 days. After the well was opened, compared with the same period, the daily increase of oil was 4 tons, and the daily increase of liquid was 15 cubic meters, and the effect was obvious.

[0058] At present, a total...

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PUM

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Abstract

The invention relates to viscosity-reduction, profile-control and oil-displacement oil well additive, oil well combination treating agent and application of the viscosity-reduction, profile-control and oil-displacement oil well additive and the oil well combination treating agent. The oil well additive comprises the following components by weight: 1-15% of OBS, 10-50% of alcohol, 1-2% of ammonium chloride, 1-2% of sodium nitrite, with the balance being water. The oil well combination treating agent comprises the oil well additive prepared with the stated components. The oil well combination treating agent further comprises, by weight, 5-10% of nonylphenol polyoxyethylene ether (NPE) and/or 10-15% of sodium alcohol ether sulphate (AES), with the balance being water. The additive and the oil well combination treating agent can effectively reduce the interfacial tension, are strong in foaming capability, and can achieve the purposes of viscosity reduction, profile control and oil displacement.

Description

technical field [0001] The invention relates to an oil well auxiliary agent for viscosity reduction, profile control and oil displacement, combined treatment agent for oil well and application thereof. Background technique [0002] There are many methods used in oilfields for viscosity reduction, profile control and oil displacement in steam huff and puff wells. However, due to the influence of high temperature and high pressure, the choices of viscosity reducer, profile control agent and oil displacement agent are limited. There have been many attempts over the years to figure out how to get the most out of limited resources. [0003] "Study on the Technology of Improving the Development Effect in the Late Stage of Multi-round Huff and Puff of Heavy Oil Reservoirs" Doctoral Dissertation of China University of Petroleum in 2007, Li Jinfa. "Research and Application of New Foam Control and Displacement System in Thermal Recovery Wells" 2011 Master's Thesis of China Universit...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/592C09K8/42E21B43/22E21B33/13E21B43/24
Inventor 高玉军
Owner PETROCHINA CO LTD
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