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Thickened oil huff and puff well viscosity reducing method by utilizing steam flooding desulfuration associated gas

A technology of associated gas and steam flooding, which is used in earth-moving drilling, wellbore/well components, and production fluids, etc., to achieve the effect of strong on-site operability, easy implementation and increased production.

Inactive Publication Date: 2018-11-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned gas stimulation measures are all produced by special equipment, and oil well associated gas is not used for stimulation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a viscosity reducer suitable for compounding with associated gas after steam flooding and desulfurization, wherein, based on the total weight of the viscosity reducer as 100%, it contains 5% fatty acid alkanolamide, 8% % of alkylphenol polyoxyethylene ether, 6% of fatty alcohol polyoxyethylene ether, 2% of polyoxyethylene alkyl alcohol ether-10 and the balance of clear water.

[0044] The specific preparation steps of the viscosity reducer provided by the present embodiment are as follows:

[0045] According to the proportion, add fatty acid alkanolamide, alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, and polyoxyethylene alkyl alcohol ether-10 into the mixing tank in sequence, and mix at room temperature for 8 hours to obtain a viscosity-reducing active ingredient;

[0046] Then the obtained viscosity reducing active component is added to the target ratio (79%) of clear water to obtain the viscosity reducing agent suita...

Embodiment 2

[0048] This embodiment provides a method for reducing the viscosity of heavy oil huff and puff wells by using associated gas after desulfurization by steam flooding, which includes the following steps:

[0049] The heavy oil huff and puff well targeted in this example is Jin 45-023-223, the crude oil viscosity of this well is 11100mPa s, due to the viscous crude oil during normal production, the back pressure of the oil well is 0.9MPa higher, so it needs to be mixed with oil for production (back pressure will reach 0.6MPa), and the current formation pressure is 2.0MPa (the original formation pressure is 6.7MPa), the formation pressure is low, the production after steam injection huff and puff, the liquid supply capacity is poor, and the liquid production rate is about 7 cubic meters (the liquid production at the beginning of the well opening The volume is 22 cubic meters), and it is expected to implement steam injection with a steam injection volume of 1,500 cubic meters.

[0...

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Abstract

The invention provides a thickened oil huff and puff well viscosity reducing method by utilizing steam flooding desulfuration associated gas. The method comprises the steps that after the steam flooding desulfuration associated gas and a viscosity reducer suitable for being compounded with the steam flooding desulfuration associated gas are successively injected into a thickened oil huff and puffwell alternately, pumping production is conducted. According to the method, the steam flooding desulfuration associated gas and the neutral viscosity reducer are successively injected into the thickened oil huff and puff well, through the synergistic effect of the gas and the neutral viscosity reducer, the viscosity of crude oil in the thickened oil well is reduced, the liquidity of the crude oilis improved, gas injection can supplement the stratum energy and improve the flowback capacity of the oil well, and therefore the purpose of increasing the yield of the thickened oil well is achieved.

Description

technical field [0001] The invention relates to a method for reducing the viscosity of a heavy oil huff and puff well by using associated gas after desulfurization by steam flooding, and belongs to the field of oil field application technology. Background technique [0002] Oil well associated gas refers to the gas that appears with petroleum liquids between oil layers during the production of oil fields. Its main component is methane, and usually contains a large amount of ethane and heavy hydrocarbon components. For the oil well associated gas that can be ignited, the common practice in this field is to collect it in a centralized manner, and use it as fuel for the heating furnace after treatment. [0003] The shifting development of steam flooding changes the components of the associated gas produced by the oil well, and gradually increases the harmful gas components such as hydrogen sulfide, making the associated gas produced by the oil well unusable. According to preli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/22
CPCE21B43/16E21B43/24
Inventor 段效威马春宝肖家宏王德伟贾财华孙强刘长环陈文明孙立军梁海波程彦符庞全书汪宁乔诗涵
Owner PETROCHINA CO LTD
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