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Non-strong water-sensitive special oil reservoir heating power oil extraction method

A thermal oil recovery, a special technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problem of high production cost and low production efficiency of special oil reservoirs with higher cost than hot water at the same temperature and non-strong water sensitivity And other issues

Active Publication Date: 2012-04-18
盘锦河升大地石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since steam has latent heat, the heat energy contained is much higher than that contained in hot water at the same temperature, and because external water or steam has different degrees of adverse effects on the oil layer, that is, the oil layer water-sensitive phenomenon is inevitable. Therefore, from the oil layer water-sensitive phenomenon, energy 1. From the perspective of efficiency, using steam as a heat carrier in thermal recovery technology is better than using hot water at the same temperature, but because the steam used in thermal recovery technology is not ordinary steam, but high-temperature and high-pressure steam, it needs a special high-pressure boiler to produce it, which is not only dangerous , the cost of steam generation is much higher than that of hot water at the same temperature; moreover, thermal recovery technology requires that high-temperature and high-pressure steam as a heat carrier must have a certain degree of dryness, and the operation and control process is complex and dangerous, resulting in high production costs for non-strong water-sensitive special oil reservoirs. Low efficiency, low ultimate recovery of the reservoir

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] A thermal oil recovery method for non-strongly water-sensitive special oil reservoirs of the present invention is carried out in a cycle according to the following steps

[0095] 1. Inject 0.1 tons of pour point depressant once into the oil layer through the oil well;

[0096] 2. Inject 1 ton of 350°C hot water mixed with pour point depressant into the oil layer through the oil well;

[0097] In the hot water mixed with the pour point depressant, the ratio of parts by weight of the hot water to the pour point depressant is 100:10;

[0098] 3. Use the existing oil extraction technology to extract oil.

[0099] Described pour point depressant is made up of the raw material of following percentage by weight:

[0100] 1) Biphenyl 20%;

[0101] 2) Diesel 78.3%;

[0102] 3) Sodium alkyl sulfonate 0.1%;

[0103] 4) Fusel oil 0.1%;

[0104] 5) Ethylene glycol butyl ether 0.5%;

[0105] 6) Alkylphenol formaldehyde resin 1%;

[0106] The content of chlorine element and su...

Embodiment 2

[0108] A thermal oil recovery method for non-strongly water-sensitive special oil reservoirs of the present invention is carried out in a cycle according to the following steps:

[0109] 1. Inject 500 tons of pour point depressant once into the oil layer through the oil well;

[0110] 2. Inject 10,000 tons of 30°C hot water mixed with pour point depressant into the oil layer through the oil well;

[0111] In the hot water mixed with the pour point depressant, the ratio of parts by weight of the hot water to the pour point depressant is 100:0.001;

[0112] 3. Use the existing oil extraction technology to extract oil.

[0113] Described high-efficiency pour point depressant is made up of the raw material of following percentage by weight:

[0114] 1) Naphthalene 20%;

[0115] Anthracene 20%

[0116] 2) 40% of natural aggregates of hydrocarbons in granular state at room temperature;

[0117] 3) Alkyltrimethylammonium chloride 2%;

[0118] 4) Fusel oil 2%;

[0119] 5) Die...

Embodiment 3

[0123] A thermal oil recovery method for non-strongly water-sensitive special oil reservoirs of the present invention is carried out in a cycle according to the following steps:

[0124] 1. Inject 250 tons of pour point depressant once into the oil layer through the oil well;

[0125] 2. Inject 5,000 tons of 170°C hot water mixed with pour point depressant into the oil layer through the oil well;

[0126] In the hot water mixed with the pour point depressant, the ratio of parts by weight of the hot water to the pour point depressant is 20:1;

[0127] 3. Use the existing oil extraction technology to extract oil.

[0128] Described pour point depressant is made up of the raw material of following percentage by weight:

[0129] 1) Methylnaphthalene 32%;

[0130] 2) Emulsified diesel oil 60%;

[0131] 3) Polyoxyethylene alkylphenol ether carboxylic acid sodium salt 1.2%;

[0132] 4) Fusel oil 1.2%;

[0133] 5) Diethylene glycol butyl ether 2%;

[0134] 6) Polyvinyl carboxyl...

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PUM

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Abstract

a heat oil extraction method of non-strong water-sensitive special oil pool is executed according to the following steps: 1) Injecting pour point depression thinner 0.1-500 ton into the oil layer by oil well; 2) Injecting 30-350 EDG C hot-water mixed pour point depression thinner into the oil layer by oil well; In the hot-water mixed pour point depression thinner, ratio of parts by weight betweenhot-water and pour point depression thinner is 100:0.001-10; 3) Using the existing oil production technology; said pour point depression thinner is one, two or more than two mixture of pour depressant nano oil displacement agent, thinner and special type organic solvent. The present invention has the advantages such as effective mining non-strong water-sensitive special oil pool, being safe and reliable, high efficiency, large-scale spreading and using, reducing cost of winning greatly, improving finally recovery ratio of oil pool and implement easy, etc.

Description

technical field [0001] The invention relates to a crude oil recovery method, in particular to a thermal oil recovery method for non-strong water-sensitive special oil reservoirs. Background technique [0002] At present, when crude oil is extracted, it is unavoidable to exploit non-strong water-sensitive high pour point oil and heavy oil special oil reservoirs. The most important feature of this special oil reservoir is that due to the physical properties of crude oil and the natural temperature of the oil layer, the crude oil is difficult to flow in the oil layer or even in a solidified or semi-solidified state, making mining extremely difficult and costly, resulting in a lot of energy waste and economic losses. When exploiting such reservoirs, thermal recovery technology is often used. The current status of thermal recovery technology is: no matter what kind of reservoir the thermal recovery technology is used for, although the characteristics of these reservoirs are diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/22E21B43/24
Inventor 李向东
Owner 盘锦河升大地石油科技有限公司