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Water displaced steam injecting hot masout exploiting method

A technology of black oil and steam injection, which is applied in the field of steam injection thermal recovery of black oil reservoirs after water flooding, can solve problems such as the inapplicability of thermal recovery, and achieve the effect of saving exploration investment and production capacity construction investment.

Inactive Publication Date: 2004-04-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For oil layers with a crude oil viscosity lower than 30mPa.s under oil layer conditions, especially black oil reservoirs with large reserves, the above-mentioned water injection development method is usually used. It is generally believed that thermal recovery cannot be applied due to production costs and technical reasons

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The buried depth of oilfield 1 reservoir is 300-500m, the effective thickness of oil layer is 21.0m, the ratio of net to total thickness is 0.46, the average porosity is 20%, the average permeability is 200md, the coefficient of variation of permeability is 0.7, and the viscosity of crude oil under oil layer conditions is 30cp , the original geological reserves are 130 million tons. The oil field has been developed by water flooding, with a relatively high water cut, and the stage recovery is only 22.0%.

[0030] 1) Carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: reservoir depth 0.30, total reservoir thickness > 5.0m, net-to-total thickness ratio > 0.3, reservoir porosity > 0.15, permeability variation coefficient < 0.8.

[0031] 2) Select the reverse 5-point well pattern, and use the newly drilled wells as steam injection wells, and the well spacing between inj...

Embodiment 2

[0036] The buried depth of oilfield 2 reservoir is 2000m, the effective thickness of oil layer is 5.5m, the ratio of net to total thickness is 0.5, the average porosity is 18%, the average permeability is 200md, the coefficient of variation of permeability is 0.6, and the viscosity of crude oil under the condition of oil layer is 3-5cp , the original geological reserves are 230 million tons. The oil field has been developed by water injection, with a relatively high water cut, and the stage recovery is only 20.0%.

[0037] 1) Carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: reservoir depth 0.30, total reservoir thickness > 5.0m, net-to-total thickness ratio > 0.3, reservoir porosity > 0.15, permeability variation coefficient < 0.8.

[0038] 2) Select the reverse 9-point well pattern, and use the newly drilled wells as steam injection wells, and the well spacing between ...

Embodiment 3

[0041] The burial depth of oilfield 3 is 1000m, the effective thickness of the oil layer is 21.0m, the net total thickness ratio is 0.46, the average porosity is 20%, the average permeability is 200md, the coefficient of variation of permeability is 0.7, the viscosity of crude oil under the oil layer condition is 20cp, the original The geological reserves are 130 million tons. The oil field has been developed by water flooding, and the water cut is relatively high, and the stage recovery degree is only 25.0%.

[0042] 1) Carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: reservoir depth 0.30, total reservoir thickness > 5.0m, net-to-total thickness ratio > 0.3, reservoir porosity > 0.15, permeability variation coefficient < 0.8.

[0043] 2) Select the reverse 7-point well pattern, and use the newly drilled wells as steam injection wells, and the well spacing between injec...

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Abstract

The water displaced steam injecting hot masout exploiting method is used for further explitation of water displaced masout deposit to raise the exploiting rate. The water displaced masout deposit is converted into hot steam soak and hot steam displacement through the steps of: selecting masout deposit with oil layer depth smaller than 3000 m, residual oil saturation degree greater than 0.30, oil depth thickness greater than 5.0 m, net total thickness ratio greater than 0.3, oil layer porosity greater than 0.15 and permedbility variation coefficient smaller than 0.8; selecting reversed nine-point well network and drilling new steam injecting well apart from production well by 150-300 m for steam injecting hot exploitation; and converting into steam displacement of simultaneous steam injection and continuous production with single well steam injection speed of 1.0-3.0 cu m / d. ha m, well bottom steam quality greater than 30 % and injection-production ratio manufactured over 1.0. The present invention raises recovery ratio by over 10 %.

Description

[0001] Field [0002] The invention relates to oil extraction technology, which is a steam injection thermal recovery method for black oil reservoirs after water flooding or after water flooding to continue to exploit and improve the recovery rate. Background technique [0003] Most of the exploitation methods of black oil reservoirs are based on water injection development, that is, water flooding. Water flooding is to inject water into the underground reservoir at a certain injection rate under a certain well pattern and well spacing, so as to maintain a certain pressure in the reservoir and maintain stable production for a period of time. The recovery degree of water flooding is about 20-40 %, after water flooding, there are still a large amount of remaining oil reservoirs in the ground that cannot be recovered. [0004] A method commonly used in oil production is steam injection thermal recovery, which is only used in heavy oil reservoirs with high viscosity and poor flui...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 张义堂宋新民李秀娈沈德煌刘尚奇张建高永荣赵郭平李松林王晓春王东辉李晓玲聂凌云
Owner PETROCHINA CO LTD
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