Heavy oil reservoir artificial bubble oil throughput exploiting method

A technology for heavy oil reservoirs and production methods, which is applied in the fields of production fluids, chemical instruments and methods, and earthwork drilling, etc., can solve problems such as reducing the viscosity of crude oil, and achieve the effects of high fluidity, good stability and good dispersion performance.

Active Publication Date: 2014-12-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above problems, the object of the present invention is to be greater than 10m for the original dissolved gas-oil ratio 3 / m 3 Provides an artificial foam oil huff and puff recovery method for heavy oil reservoirs, the method can greatly reduce the viscosity of crude oil, and form artificial foam dispersion flow in the oil layer, can realize heavy oil reservoirs with foam oil phenomenon in The purpose of continuing economical and efficient development after the foam oil recovery stage and greatly enhancing the recovery factor

Method used

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Examples

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Embodiment 1

[0038] The technical scheme of the present invention is illustrated below by taking a certain original gas-bearing heavy oil reservoir as an example, but it should be noted that the present invention is by no means limited to this heavy oil reservoir. The original dissolved gas-oil ratio is 15m 3 / m 3 , The viscosity of degassed crude oil is 50,000 centipoise and the viscosity of gas-bearing crude oil is 2,000 centipoise under the condition of oil reservoirs. It is developed by the natural energy cold recovery method of foam oil.

[0039] This embodiment provides an artificial foam oil huff and puff recovery method applied to the above-mentioned heavy oil reservoir, which includes:

[0040] Step 1: Development and production of oil-gas ratio increased to 80m 3 / m 3 , inject solvent-based foam liquid into the oil well to form a foam liquid slug, the injection volume of the foam liquid is 500 tons, and the injection rate is 50 tons / day;

[0041] Wherein, the solvent-based fo...

Embodiment 2

[0061] The technical scheme of the present invention is illustrated below by taking a certain original gas-bearing heavy oil reservoir as an example, but it should be noted that the present invention is by no means limited to this heavy oil reservoir. The original dissolved gas-oil ratio is 25m 3 / m 3 , The viscosity of degassed crude oil is 40,000 centipoise under oil reservoir conditions, and the viscosity of gas-bearing crude oil is 1,000 centipoise. It is an undeveloped original oil reservoir.

[0062] This embodiment provides an artificial foam oil huff and puff recovery method applied to the above-mentioned heavy oil reservoir, which includes:

[0063] Step 1: Initially inject solvent-based foam liquid into the oil well to form a foam liquid slug. The injection volume of solvent-based foam liquid is 2,000 tons, and the injection rate is 200 tons / day;

[0064] Wherein, the solvent-based foam liquid is a composition of a foaming agent, a foam stabilizer and a solvent, th...

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Abstract

The invention provides a heavy oil reservoir artificial bubble oil throughput exploiting method. The method comprises the following steps of step 1, injecting solvent type foam liquid into an oil well; step 2, after the well is covered for proper time, opening the well to produce oil; step 3, when the daily oil yield is 1m<3>/d to 2 m<3>/d, stopping throughput production of the period, and repeating the step 1 to step 3, and when the gas yield is gradually reduced and the cycle produced gas-oil ratio is smaller than 5, performing step 4; step 4, injecting an oil-soluble viscosity reducer into the oil well; step 5, injecting a solvent type foaming agent into the oil well; step 6, after the well is covered for proper time, opening the well to produce oil; step 7, when the daily oil yield is 1m<3>/d to 2 m<3>/d, stopping throughput production of the period, and repeating the step 4 to step 6; step 8, when the cycle oil yield is smaller than 100 to 200m<3>, stopping production. By the exploiting method provided by the invention, the viscosity of crude oil can be greatly reduced, and the aim of greatly improving the primary gas-containing heavy oil reservoir recovery ratio is fulfilled due to the fact that bubble oil flow is artificially produced.

Description

technical field [0001] The invention relates to a mining method of a heavy oil reservoir, in particular to a method of artificial foam huff and puff mining of a heavy oil reservoir, and belongs to the technical field of petroleum mining. Background technique [0002] "Foamy oil" means that in the natural energy extraction process of heavy oil / super heavy oil reservoirs, with the reduction of reservoir pressure, the dissolved gas in crude oil does not break away instantly to form free gas, but in an extremely complex The micro-bubble form is highly dispersed in the oil flow, forming a "gas-in-oil" type foam dispersion flow. [0003] The "foamy oil phenomenon" widely exists in Canada, Venezuela, my country's Liaohe, and Xinjiang heavy oil / ultra-heavy oil reservoirs in the natural energy development process, reflecting "high crude oil viscosity, low production gas-oil ratio, high daily crude oil production level, and declining production The unique recovery characteristics of f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/518
CPCY02P20/54
Inventor 吴永彬王红庄刘尚奇蒋有伟
Owner PETROCHINA CO LTD
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