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A flooding method of injecting strong high-pressure air and enriched oxygen into deep ancient buried hill reservoirs

A technology of high-pressure air and oil displacement method, which is applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc. Oxidative cracking speed is slow and other problems, to achieve the effect of improving oil recovery rate and recovery rate, avoiding excessive nitrogen content, and rapid oxidative cracking

Active Publication Date: 2018-08-14
中嵘能源科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (2) The rock block system is composed of rock blocks cut by cracks. The seepage storage space in the rock block includes small cracks with a width of less than 10 μm and intergranular and intercrystalline pores connected with them, and dissolution pores. The porosity The porosity is larger than that of the fracture system, which is a good oil storage space, but its permeability is poor
[0008] In the prior art, there are few studies on the exploitation of ancient buried hill oil reservoirs, and no initiator is used, so there are problems of slow oxidation cracking speed, low oil production speed and recovery factor
The existing air flooding oil recovery technology is mainly suitable for oil reservoirs with a depth of about 1000 meters, and the recovery effect on ancient buried hill oil reservoirs is not good

Method used

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  • A flooding method of injecting strong high-pressure air and enriched oxygen into deep ancient buried hill reservoirs
  • A flooding method of injecting strong high-pressure air and enriched oxygen into deep ancient buried hill reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] An oil displacement method for injecting strong high-pressure air and enriched oxygen into a deep ancient buried hill reservoir, comprising the following steps:

[0041] Step 1. First perform high-pressure gas injection well completion on the gas injection well, such as figure 1 As shown in the figure, the sequence of components running into the well is the bell mouth (8), packer (5), safety valve (3), sliding sleeve (1), and compensator (13), which are lowered together with the tubing (4). Enter the bottom of the well, run the bell mouth to 4 meters above the artificial well bottom (9) and 7 meters above the overburden (10), and adjust the position of the packer to above the overburden (6) in the middle and lower part of the perforation section (7) At 3 meters, the safety valve is adjusted to 18 meters above the packer, and the sliding sleeve is adjusted to 10 meters above the safety valve. together to form a closed space.

[0042] Step 2. After well completion, inject...

Embodiment 2

[0049] An oil displacement method for injecting strong high-pressure air and enriched oxygen into a deep ancient buried hill reservoir, comprising the following steps:

[0050] Step 1. First perform high-pressure gas injection well completion on the gas injection well, such as figure 1 As shown in the figure, the sequence of components running into the well is the bell mouth (8), packer (5), safety valve (3), sliding sleeve (1), and compensator (13), which are lowered together with the tubing (4). Enter the bottom of the well, run the bell mouth to 5 meters above the artificial well bottom (9) and 10 meters above the overburden (10), and adjust the position of the packer to above the overburden (6) in the middle and lower part of the perforation section (7) At 5 meters, the safety valve is adjusted to 15 meters above the packer, and the sliding sleeve is adjusted to 10 meters above the safety valve. together to form a closed space.

[0051] Step 2. Inject 0.1PV of a mixture ...

Embodiment 3

[0058] An oil displacement method for injecting strong high-pressure air and enriched oxygen into a deep ancient buried hill reservoir, comprising the following steps:

[0059] Step 1. First perform high-pressure gas injection well completion on the gas injection well, such as figure 1 As shown in the figure, the sequence of components running into the well is the bell mouth (8), packer (5), safety valve (3), sliding sleeve (1), and compensator (13), which are lowered together with the tubing (4). Enter the bottom of the well, run the bell mouth to 3 meters above the artificial well bottom (9) and 5 meters above the overburden (10), and adjust the position of the packer to above the overburden (6) in the middle and lower part of the perforation section (7) At 4 meters, the safety valve is adjusted to 15 meters above the packer, and the sliding sleeve is adjusted to 10 meters above the safety valve. together to form a closed space.

[0060] Step 2. Inject the mixture of 0.15P...

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Abstract

The invention provides an oil displacement method of injecting strong high pressure air into deep ancient buried hill reservior and enriching oxygen which comprises the following steps that first, high-pressure gas-injection well completion is performed to a gas-injection well, 0.05-0.15PV initiating agent which comprises sodium sarcosinate and mannitol is injected into the gas-injection well after well completion; strong high pressure gas injection is performed, 30000-50000 standard cubic air is injected into the formation; by removing nitrogen from the air, oxygen-enriched gas mixture containing 50-70% of oxygen by mass is separated, and the oxygen-enriched gas mixture is injected into the oil reservoir; strong high pressure gas injection is performed; when the formation cracking is stable, the gas injection is increased for strong high pressure gas injection. According to the oil displacement method of injecting strong high pressure air into deep ancient buried hill reservior and enriching oxygen, the original colloid and heavy crude oil is cracked under the action of the formation temperature by strong oxidation, the oil-producing rate and the oil-recovery rate of the subsequent air flooding are enhanced greatly, the oxidative cracking reaction time is reduced, rapid oxidative cracking is achieved and the service efficiency of the gas is improved.

Description

technical field [0001] The invention relates to an oil displacement method for injecting strong high-pressure air and enriched oxygen into deep ancient buried hill oil reservoirs, belonging to the field of oil exploitation. Background technique [0002] The reservoirs of ancient buried hill oil reservoirs have completely different storage and seepage structures from those of sandstone reservoirs, with deep oil layers (mostly 2000-7000 meters) and thick oil layers (generally between 100-600 meters) It is completely different from other air flooding methods. First, it is necessary to accurately judge whether the reservoir is a gas flooding reservoir or a water flooding reservoir. The reservoir is injected with gas at the high part of the oil layer, and the high-pressure and high-power full-load gas injection mode is adopted. A large number of studies have shown that the reservoirs of ancient buried hill oil reservoirs are actually composed of two storage and seepage systems, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/22E21B43/243E21B43/241E21B43/18C09K8/594
CPCC09K8/594E21B43/16E21B43/166E21B43/18E21B43/241E21B43/243
Inventor 邓晓亮栾天洪兆
Owner 中嵘能源科技集团有限公司
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