An emulsified viscosity-reducing oil displacement composition suitable for heavy oil reservoirs

A technology for emulsifying viscosity-reducing heavy oil reservoirs, applied in the field of chemical compound flooding, which can solve the problems of crude oil loss in reservoirs, such as crude oil viscosity, oil washing, unobvious oil displacement effect, high water content of single well in oil layer, etc., and achieve good emulsification performance , The effect of washing oil is good, and it is easy to buy

Active Publication Date: 2017-09-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, my country mainly adopts thermal recovery technologies such as hot water injection, steam injection, electromagnetic heating, and burning oil layers to exploit heavy oil. However, long-term thermal recovery often faces three problems in production: A large amount of lost crude oil has a higher viscosity; (2) The wettability of reservoir rocks becomes more oil-wet, and the capillary resistance increases; (3) The water content of a single well in the oil layer is high, and the flooding is serious
The viscosity-reducing effect of these viscosity reducers can be over 95%, but there are also deficiencies. For example, the degradation intermediates of alkylphenol polyoxyethylene ethers are considered harmful to the human body or the environment and have been discontinued in Europe and the United States.
CO in viscosity reducers containing sodium carbonate 3 2- Ca 2+ / Mg 2+ Ion scaling blocks the formation, and some viscosity reducers have both temperature and salt resistance properties, but the oil washing and displacement effects are not obvious

Method used

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  • An emulsified viscosity-reducing oil displacement composition suitable for heavy oil reservoirs
  • An emulsified viscosity-reducing oil displacement composition suitable for heavy oil reservoirs
  • An emulsified viscosity-reducing oil displacement composition suitable for heavy oil reservoirs

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Different types of industrial active agents and simulated formation water were used to treat crude oil in a certain block of Liaohe River (crude oil density = d = 0.9137g / cm 3 ) to prepare oil sand (80-100 mesh) washing effect. Oil washing process: Weigh a certain amount of oil sand and put it into the oil washing bottle, inject various prepared agents (prepared with corresponding simulated formation water) respectively, and then put it into an air bath shaker to keep warm and shake for 2 hours (oscillation speed = 150-160r / min), then take it out and put it in a thermostat for 5 hours (55°C) to keep warm for 5 hours, record the results, and calculate the oil washing efficiency (oil washing efficiency = mass of precipitated oil / mass of oil contained in original oil sand × 100%), The experimental results are shown in Table 2.

[0028] Table 2

[0029]

[0030]

[0031] From the experimental results, it can be seen that the simulated formation water in the Liaohe oil...

Embodiment 2

[0033] Using 80-100 mesh to simulate oil sand in a certain block of Liaohe River, aged at 80°C for 20 days, the viscosity of the crude oil used in the emulsification experiment was 4652mPa·s at 80°C. The prepared various compounding agents (PAAS and another additive, prepared with corresponding simulated formation water) were injected respectively, shaken in the air bath shaker for 2 hours and then kept for 5 hours, and the oil washing efficiency test experiment was carried out. The results are as follows: Shown in Table 3 (concentration % of various agents in Table 3 all refers to mass concentration, and herein, unless otherwise specified, concentration % all refers to mass concentration).

[0034] table 3

[0035]

[0036] The system viscosity of the complex agent is not high, and the emulsification stability is better. The combination of PAAS and APG has the best oil removal efficiency, and the combination with T80 has higher oil removal efficiency. The emulsion formed ...

Embodiment 3

[0038] Using 80-100 mesh simulated oil sand in a certain block of Liaohe River, aging at 55°C for 20 days, injecting prepared various compounding agents (PAAS and APG0814 with different mass concentrations, prepared with corresponding simulated formation water), Shake in a bath shaker for 2 hours, then keep warm for 5 hours, and carry out the oil washing efficiency test experiment, the results are shown in Table 4.

[0039] Table 4

[0040]

[0041] The content of PAAS is 0.2%, and the content of APG0814 is from 0.02% to 0.10%. The experimental results of these four groups show that the oil washing efficiency exceeds 60%, which is a very good effect. The best of these is a combination of the two with a mass ratio of 5:1.

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Abstract

The invention provides an emulsified viscosity-reduction oil displacement composition for heavy oil reservoirs. The emulsified viscosity-reduction oil displacement composition for heavy oil reservoirs is composed of following components in percentage by weight: 0.1-0.3% of anionic polymer, 0.01-0.1% of non-ionic surfactant, 0.02-0.12% of emulsion stabilizer, a right amount of inorganic salt and the balance of water. The oil displacement composition provided by the invention has the advantages of lower cost, simple preparation process, favorable biodegradability, high safety, environment friendliness, favorable viscosity-reduction and oil-washing effects on heavy oil, and high oil displacement efficiency.

Description

technical field [0001] The invention relates to an emulsified viscosity-reducing oil displacement composition suitable for heavy oil reservoirs, and belongs to the technical field of chemical composite flooding in the field of oil exploitation. Background technique [0002] Heavy oil is also called "heavy oil" abroad, and more than 70% of the world's remaining oil resources of about 10 trillion tons are heavy oil resources. Therefore, the exploitation of heavy oil occupies a very important position in the future energy strategy. my country is rich in heavy oil resources, and its proven and controlled reserves have reached 1.6 billion tons. It is the fourth largest heavy oil producer in the world after the United States, Canada and Venezuela. The focus is on oil fields such as Shengli, Liaohe, Henan and Xinjiang. my country's onshore heavy oil resources account for more than 20% of the total oil resources, and the proven and controlled reserves are about 4 billion tons. Mor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/584
CPCC09K8/584C09K8/588
Inventor 张翼陈健韩冬范家屹陈海汇
Owner PETROCHINA CO LTD
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