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Steam huff and puff oil recovery method for heterogeneous heavy oil reservoir

A heavy oil reservoir, heterogeneous technology, applied in the development of fluids, earthwork drilling, data processing applications, etc., can solve the problems of high comprehensive water cut, low peak oil production, low cumulative oil production, etc.

Active Publication Date: 2022-06-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses an oil-soluble compound viscosity reducer and carbon dioxide as a viscosity-reducing slug before injecting steam. Although it can reduce the viscosity of crude oil, when it is applied in a heterogeneous reservoir, the steam injected next often preferentially enters the high-permeability, High-production intervals, and low-permeability and low-production intervals with high oil saturation are difficult to be effectively swept, resulting in poor production effect of heavy oil well huff and puff cycle thermal recovery, low cumulative oil production, and low peak oil production. High water content, low oil-gas ratio

Method used

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  • Steam huff and puff oil recovery method for heterogeneous heavy oil reservoir

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Reservoir situation

[0040] A heavy oil development well, the middle depth of the reservoir is 315 meters, the effective thickness of the oil layer is 5.8 meters, the original oil saturation is 65.61%, the average porosity is 28.3%, and the average permeability is 1.28 μm 2 , the permeability gradient is 2.43, and the crude oil viscosity is 105177.6MPa.s when the oil layer temperature is 27.5℃, which belongs to the heterogeneous super-heavy oil reservoir.

[0041] There are 12 rounds of conventional steam huff and puff in total, the oil production of the 12th steam huff and puff cycle is 71.2t, the peak oil production is 1.3t, and the oil-steam ratio is 0.08.

[0042] 2. Steam huff and puff oil recovery

[0043] According to the reservoir conditions, the design quantity is determined as: nitrogen foam 300m 3 (The amount of nitrogen foam converted according to formation conditions), emulsion viscosity reducer 8t, liquid carbon dioxide 100t, nitrogen 11000Nm 3 , th...

Embodiment 2

[0055] 1. Reservoir situation

[0056] A heavy oil reservoir is 299.4 meters deep, the effective thickness of the oil layer is 7.4 meters, the original oil saturation is 57.7%, the average porosity is 36.6%, and the average permeability is 2.43 μm 2 , the permeability gradient is 15.2, and the crude oil viscosity is 136447MPa.s at the oil layer temperature of 30.8 ℃. It is a super heavy oil with the characteristics of low temperature and super heavy oil.

[0057] The conventional steam huff and puff has accumulated 3 rounds, the oil production of the third steam huff and puff cycle is 38t, the peak oil production is 2.1t, and the oil-steam ratio is 0.03.

[0058] 2. Steam huff and puff oil recovery

[0059] According to the reservoir conditions, the design quantity is determined as: nitrogen foam 300m 3 (The amount of nitrogen foam converted according to formation conditions), emulsion viscosity reducer 6t, liquid carbon dioxide 86t, nitrogen 9300Nm 3 , The cumulative injec...

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Abstract

The invention relates to a steam huff and puff oil recovery method for heterogeneous heavy oil reservoirs, and belongs to the technical field of steam huff and puff oil recovery. The steam huff and puff recovery method for heterogeneous heavy oil reservoirs of the present invention comprises: injecting a nitrogen foam slug into the oil layer; then injecting the viscosity reducing slug into the oil layer; then injecting the nitrogen slug into the oil layer; injecting steam into the oil layer, Then stew the well and recover. Nitrogen foam is injected first, and the Jiamin effect of nitrogen foam can realize effective plugging adjustment for high-permeability and high-production intervals, prompting subsequent slugs to enter low-permeability and low-production intervals with high oil saturation, and realize expansion of steam The purpose of sweeping; the viscosity reducing slug can effectively reduce the viscosity of crude oil; the nitrogen slug is not only conducive to driving the viscosity reducing slug deep into the oil layer, but also plays the role of expanding the effective radius of the viscosity reducing slug. The synergistic effect of each slug achieves the purpose of improving the cycle production and recovery factor of a single well in heterogeneous heavy oil reservoirs.

Description

technical field [0001] The invention relates to a steam huff and puff oil recovery method for heterogeneous heavy oil reservoirs, and belongs to the technical field of steam huff and puff oil recovery. Background technique [0002] my country's heavy oil resources are widely distributed and rich in reserves, and account for a relatively high proportion of oil and gas resources. The content of colloid, asphaltene and paraffin in heavy oil is high, which leads to its high viscosity, poor fluidity, and difficulty in mining, gathering and transportation. The conventional recovery method for heavy oil reservoirs is to inject high-temperature steam into the heavy oil reservoir, and use the heat carried by the steam to heat the heavy oil, thereby reducing the viscosity of the crude oil and improving the fluidity of the crude oil formation. Crude oil flows from the oil layer to the wellbore driven by the formation pressure to realize the efficient production of heavy oil reservoirs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/16E21B43/22E21B47/00G06Q50/02
CPCE21B43/24E21B43/16E21B47/00E21B43/164G06Q50/02
Inventor 李飞鹏张喜玲余倩卢建恒王若浩王孟江赵长喜
Owner CHINA PETROLEUM & CHEM CORP