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Gravity-assisted steam flooding exploitation method for heavy laver common heavy oil reservoir

A heavy oil reservoir, auxiliary steam technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low production efficiency, high drilling investment and steam injection cost, and achieve improved coverage and improved The effect of oil recovery

Active Publication Date: 2008-02-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For "heavy oil" production, drilling investment and steam injection costs are relatively high, and production efficiency is low

Method used

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  • Gravity-assisted steam flooding exploitation method for heavy laver common heavy oil reservoir

Examples

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Effect test

example 1

[0035] Example 1: The sand body of oil layer 6 in an oilfield is a thick massive ordinary heavy oil reservoir, the viscosity of degassed crude oil at 50°C is 2284.2mPa·s, and the average thickness of the oil layer is 38.89m. The vertical well steam huff and puff has been used in this reservoir for an average of 7 cycles, the formation pressure has dropped from the original value of 16.1MPa to 1.0MPa, and the cycle oil production and oil-gas ratio have decreased. According to the geological characteristics, crude oil properties and development status of the reservoir, gravity-assisted steam flooding technology combined with vertical wells and horizontal wells was adopted.

[0036] (1) Perform rough screening according to reservoir geological parameters and fluid characteristics;

[0037] (2) The thickness of the continuous oil layer is greater than 15m, the porosity is greater than 20%, the permeability is greater than 500md, and the ratio of vertical permeability to horizontal...

example 2

[0043] Example 2: The oil layer of the third member of the east of an oilfield is a thick block ordinary heavy oil reservoir, the viscosity of degassed crude oil at 50°C is 7478mPa·s, and the average thickness of the oil layer is 22m. The vertical well steam huff and puff has been used in this reservoir, and the average has reached 6 cycles. The formation pressure has dropped from the original value of 12.6MPa to 3.0MPa, and the cycle oil production and oil-gas ratio have decreased. According to the geological characteristics, crude oil properties and development status of the reservoir, gravity-assisted steam flooding technology combined with vertical wells and horizontal wells was adopted.

[0044] (1) Perform rough screening according to reservoir geological parameters and fluid characteristics;

[0045] (2) The thickness of the continuous oil layer is greater than 15m, the porosity is greater than 20%, the permeability is greater than 500md, and the ratio of vertical perme...

example 3

[0051] Example 3: The third member of the Shahejie Formation in an oilfield is a thick massive ordinary heavy oil reservoir, the viscosity of degassed crude oil at 50°C is 3500mPa·s, and the average thickness of the oil layer is 54m. The reservoir is buried at a depth of 1300m, the original reservoir pressure is 13.4MPa, and the original reservoir temperature is 52°C. According to the geological characteristics and crude oil properties of the reservoir, the gravity-assisted steam flooding technology of horizontal well and horizontal well combination was adopted.

[0052] (1) Perform rough screening according to reservoir geological parameters and fluid characteristics;

[0053] (2) The thickness of the continuous oil layer is greater than 15m, the porosity is greater than 20%, the permeability is greater than 500md, and the ratio of vertical permeability to horizontal permeability is greater than 0.2, which is suitable for gravity-assisted steam flooding;

[0054] (3) For und...

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Abstract

The invention relates to a gravity-assisted steam flooding mining method for exploiting thick-bed ordinary heavy oil reservoirs. In the thick-bed ordinary heavy oil reservoirs, the methods of steam injection in vertical wells and production in horizontal wells or steam injection in horizontal wells and production in horizontal wells are adopted . For the oil reservoir blocks that have been developed by vertical wells, the combination of vertical wells and horizontal wells can be used to drill horizontal production wells along the lower part of the oil layer in the known oil reservoir blocks, so that the vertical steam injection wells are obliquely above the horizontal wells, and the production wells and injection wells Simultaneous huff and puff of steam wells for 2-4 cycles or thermal communication between steam injection wells and production wells or formation of reservoir pressure down to 3-4MPa, transfer to steam injection wells and steam injection production wells for production and production; or steam injection wells and production wells have formed thermal communication , After the newly drilled horizontal production well huffs and puffs for one cycle and removes the pollution near the wellbore, the steam injection production well is transferred to the steam injection well for production and production. The invention can exert the sweeping effect of the displacement fluid in both vertical and horizontal directions, increase the sweeping range of the driving fluid, and increase the crude oil recovery rate of the thick common heavy oil reservoir.

Description

technical field [0001] The invention relates to oil exploitation technology, and is a gravity-assisted steam flooding exploitation method for exploiting thick-layer ordinary heavy oil reservoirs. Background technique [0002] Steam huff and puff is the main mining method for heavy oil reservoirs. With the development of mining technology, the scope and means of mining are constantly updated. At present, SAGD-Steam Assisted Gravity Drainage (SAGD-Steam Assisted Gravity Drainage) method is used for the recovery of super heavy oil reservoirs. This method is aimed at the geological conditions of tar sands, and the crude oil in tar sands is characterized by viscosity High (viscosity greater than 50,000mpa.s) high density (density greater than 0.98g / cm 3 , close to the density of water, it is difficult or impossible to flow at the original formation temperature. The purpose of injecting steam is mainly to heat the oil layer, reduce the viscosity of crude oil, and make the ultra-...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 张义堂任芳祥刘尚奇高永荣周鹰王晓春吴淑红刘双卯沈德煌张霞杨立强赵立文由世江李晓玲韩静
Owner PETROCHINA CO LTD
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