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Method capable of improving recovery efficiency through heavy oil thermal recovery

A technology for thermal recovery and recovery of heavy oil, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of inability to adjust gas consumption and construction methods, insignificant viscosity reduction effect, and ineffective energy enhancement effect. Ideal and other issues, to achieve the effect of improving the dryness of bottom-hole steam, reducing heat loss, and increasing driving energy

Inactive Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the field practice results in recent years show that: 1. Carbon dioxide has a significant effect of assisting chemical flooding agents in reducing viscosity in super-heavy oil blocks, and the effect of pure energy enhancement is not ideal; The effect is not obvious; 3. The injection of multi-element thermal fluid requires a professional multi-element thermal fluid generator, and the injection process needs to be accompanied by chemical agents such as corrosion inhibitors. The construction cost is relatively high. Features and problems Adjust gas consumption and construction methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In the first stage, 50t of liquid carbon dioxide is being squeezed in before steam injection;

[0022] In the second stage, 30m of local hot sewage at 70°C is being replaced 3 Stew well for 16 hours afterward;

[0023] In the third stage, nitrogen gas of 30000N·m is pre-injected before steam injection 3 , take positive injection; injection pressure 20Mpa, injection speed 600N·m 3 / h.

[0024] In the fourth stage, 3000t steam is injected at a steam injection rate of 10t / h, and the injection pressure is 18Mpa.

[0025] After applying this technology, the production time of the well was extended by 39 days, the cumulative oil increase was 162 tons, and the oil-steam ratio was increased by 0.04; while for a multi-component thermal fluid injection well, the production time was shortened by 134 days, and the cumulative oil increase was 414 tons, but the injection period was different from that of Steam channeling occurred in 3 wells, causing 3 production wells to be shut ...

Embodiment 2

[0027] In the first stage, 10t of liquid carbon dioxide is being squeezed in before steam injection;

[0028] In the second stage, 20m of local hot sewage at 100℃ is being replaced 3 Stew well for 8 hours afterward;

[0029] In the third stage, nitrogen gas of 12000N·m is pre-injected before steam injection 3 , take positive injection; injection pressure 15Mpa, injection speed 1200N m 3 / h.

[0030] In the fourth stage, 1000t of steam is injected at a steam injection rate of 7t / h, and the injection pressure is 18Mpa. After 4 days of simmering, the well is blown out and switched to pumping for production.

Embodiment 3

[0032] In the first stage, 500m of gaseous carbon dioxide is being squeezed in before steam injection 3 / m;

[0033] In the second stage, 30m of local hot sewage at 80°C is being replaced 3 Stew well for 12 hours afterward;

[0034] In the third stage, nitrogen gas of 15000N·m is pre-injected before steam injection 3 , take positive injection; injection pressure 16Mpa, injection speed 800N m 3 / h.

[0035] In the fourth stage, 1000t steam is injected at a steam injection rate of 8t / h, and the injection pressure is 20Mpa.

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Abstract

The invention provides a method for improving recovery efficiency through heavy oil thermal recovery, and belongs to the field of the heavy oil thermal recovery process capable of increasing stratum energy and improving the heavy oil recovery efficiency. The method comprises the process steps that in the first stage, carbon dioxide or nitrogen is extruded forwardly before steam injection; in the second stage, thermal waste water in an area is forwardly replaced, and then well shutting is carried out; in the third stage, nitrogen or carbon dioxide is injected; and fourthly, the steam is injected. According to the characteristics of an oil reservoir, the injection amount and the injection sequence of the nitrogen and the carbon dioxide are adjusted, and the method is mainly applied to heavy oil sealing fault block energy increasing and a super heavy oil block thermal production well to assist in steam huff and puff.

Description

technical field [0001] The invention relates to the technical field of heavy oil thermal recovery, in particular to a method for increasing formation energy and improving heavy oil thermal recovery recovery. Background technique [0002] Due to the characteristics of high viscosity and poor fluidity of heavy oil, the exploitation of heavy oil reservoirs is restricted, and as the development enters the middle and later stages, the problems of high viscosity and poor liquid supply capacity of crude oil are particularly prominent, and the degree of recovery is also increasing. lower. At present, nitrogen injection or carbon dioxide injection is mainly used to replenish formation energy and improve oil recovery. Because carbon dioxide dissolves in crude oil and water, on the one hand, it breaks the severely emulsified crude oil, greatly reduces the viscosity, and improves the fluidity of crude oil near the well; on the other hand, the release of carbon dioxide dissolved in oil ...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/22
Inventor 张丁涌张德崇郑新欣张学军刘洪柯
Owner CHINA PETROLEUM & CHEM CORP
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