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A fire flooding oil recovery method using oleic acid for in-situ modification

An in-situ modification and oleic acid technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of high viscosity, high density and low fluidity of crude oil, low oil recovery by fire flooding, Problems such as difficult lifting of production wells, etc., to achieve good economic benefits, improve oil properties, and improve fluidity

Active Publication Date: 2018-01-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the application of fire flooding to heavy oil fields still faces some difficulties, mainly due to the high viscosity, high density and low fluidity of crude oil, so that the recovery rate of fire flooding is not high, the quality of product oil is not good, and production wells It is not easy to lift and the economic benefit is not good, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example provides an indoor simulation comparison experiment of in-situ modified oil recovery by fire flooding and direct fire flooding with oleic acid.

[0028] In this embodiment, a three-dimensional physical model is used for simulation experiments. The size of the model is 400mm×400mm×100mm, and artificial cemented core is used. The porosity of the sand-filled model is 30%, the permeability is 800mD, the oil saturation is 0.8, and the saturated oil sample is collected from an oilfield with a viscosity of 22926mPa. s (20°C) crude oil sample; the well layout is: a five-point well pattern, with an injection well in the center and four production wells around it. The experimental temperature is 20°C, and the experimental injection pressure is 3MPa.

[0029] The direct fire flooding oil recovery method of this embodiment includes the following steps: continuously inject air into the model through the gas injection well, the injection rate of air is 10L / h, ignite the...

Embodiment 2

[0033] This example provides a field comparative experiment of in-situ modified oil recovery by fire flooding and direct fire flooding with oleic acid.

[0034] The oil reservoir selected in this example is an abandoned oil reservoir after steam flooding in a heavy oil reservoir block of Xinjiang Oilfield. A five-spot well pattern of 70m×70m was selected in this reservoir, and a fire flooding oil recovery experiment using oleic acid for in-situ modification was carried out. The average formation pressure of this reservoir is 2.8MPa, the formation temperature is 17.4°C; the effective thickness of the oil layer is 10m; the porosity is 25.7%, and the oil layer permeability is 676mD; the average crude oil viscosity at the oil layer temperature is 10000mPa·s; the crude oil density is 0.9662g / cm 3 ; The oil saturation is 62.1%.

[0035] The fire flooding oil recovery method utilizing oleic acid for in-situ modification of the present embodiment comprises the following steps:

[...

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Abstract

The invention provides a fire flooding oil production method for in-situ modification by utilizing oleic acid. The fire flooding oil production method comprises the following steps: screening a heavy oil reservoir; as for the screened heavy oil reservoir, continuously injecting oleic acid slugs into an oil layer through a gas injection well, closing the gas injection well after the completion of injection and leaving the gas injection well for 4-7 days' standing, so that the oleic acid as well as crude oil is subjected to cracking modification reaction under the ground; carrying out fire flooding oil production; monitoring produced gas and ensuring that the content of oxygen in the produced gas is within a safety range; meanwhile, assaying and analyzing the produced gas; after the burning front edge reaches the vicinity of a producing well, when the content of the oxygen in the produced gas is larger than 5 percent or the wellhead temperature of the producing well is larger than 200 DEG C according to volume fraction, finishing the fire flooding oil production. The fire flooding oil production method has the benefits that as the oleic acid is utilized for the in-situ modification, the oil property of the heave-oil reservoir can be improved, the viscosity of the crude oil can be reduced, and the final fire flooding recovery ratio can be improved.

Description

technical field [0001] The invention relates to a fire flooding oil recovery method using oleic acid for in-situ modification, and belongs to the technical field of heavy oil oil field exploitation in the field of petroleum exploitation. Background technique [0002] Compared with traditional steam flooding, the obvious advantage of fire flooding is that the oil displacement speed is fast. During fire flooding, the heavy components of crude oil in the oil layer are used as fuel, and the heat generated by combustion drives the crude oil in the oil layer injected into the oil well. To the production well, out of the ground. At present, fire flooding has been widely used at home and abroad to exploit heavy oil fields. [0003] However, the application of fire flooding to heavy oil fields still faces some difficulties, mainly due to the high viscosity, high density and low fluidity of crude oil, so that the recovery rate of fire flooding is not high, the quality of product oil ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/00
CPCE21B43/247
Inventor 席长丰张霞林关文龙王伯军梁金中杨凤祥施小荣师耀利
Owner PETROCHINA CO LTD
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