Hydrogen-injection oil extraction method

A technology for hydrogen and gas injection wells, applied in the direction of production fluid, earth drilling, isolation devices, etc., can solve the problems of high air cost, high cost, unfavorable reservoir development, etc., and achieve the effect of improving oil displacement efficiency

Active Publication Date: 2011-03-30
PETROCHINA CO LTD
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AI Technical Summary

Problems solved by technology

The temperature of the steam injection is very high, and when the steam reaches a certain part of the reservoir, the reservoir between this part and the steam injection well must reach the temperature of the steam, so the injected heat is very costly, and the heat carried by the hot water injection is too large. Less, heating the oil reservoir needs to inject a large amount of hot water, which is not good for the development of the oil reservoir. The burning front of the oil layer will burn all the remaining organic matter during the advancing process of the burning front. , a large amount of air needs to be injected and the cost is huge

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Embodiment 1

[0020] In a block of an oilfield, the depth of the oil layer is 1800 meters, the temperature of the oil layer is 65°C, and the thickness of the oil layer is 10 meters. The depletion production has been carried out. Reservoir pressure is 10 MPa after depleted production. As the temperature of long-term water injection reservoirs decreased, wax began to precipitate in the oil layer, affecting crude oil recovery, so it was decided to carry out hydrogen injection oil recovery.

[0021] refer to figure 1 . The first step: improve the well pattern in the hydrogen injection oil production area, adopt a nine-point well pattern, the gas injection well 1 is in the middle, and there are 8 production wells 2 around it, and the 8 production wells 2 are arranged in a rectangle. The gas injection well 1 is 100-200 meters away from the near production well 2, and 140-280 meters away from the far production well 2. In the present embodiment, there are 150 meters away from the nearer product...

Embodiment 2

[0026] In a block of an oilfield, the reservoir depth is 4,000 meters, the reservoir temperature is 132°C, the thickness of the reservoir is 20 meters, the reservoir pressure is 30 MPa, and the permeability is 1 millidarcy. It was decided to carry out hydrogen injection oil recovery.

[0027] refer to figure 1 . The first step: improve the well pattern in the hydrogen injection oil production area, adopt a nine-point well pattern, the gas injection well is in the middle, and there are 8 production wells around it. Meter. Gas injection wells are connected with hydrogen injection equipment, and production wells are connected with oil production equipment.

[0028] The second step: continuously inject hydrogen into the gas injection well 1, and the gas injection volume is 7000 cubic meters per day (volume under atmospheric pressure).

[0029] Step 3: Regularly detect the amount of hydrogen produced by the production well (test once a week). If the hydrogen production of a cer...

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Abstract

The invention discloses a hydrogen-injection oil extraction method. An oilfield oil extraction area block is provided with a gas-injection well and surrounding production wells; the gas-injection well is connected with equipment for injecting hydrogen or hydrogen and carbon dioxide; the gas-injection well is connected with steam-injection heating ground layer equipment or electric heating equipment for heating gas injected into the ground layer at the bottom of the well; the production well is connected with oil extraction equipment; the hydrogen or the hydrogen and the carbon dioxide gas arecontinuously injected into the gas-injection well by using the equipment, the temperature of a near-well zone of the gas-injection well rises from 100 DEG C to 500 DEG C simultaneously through steam injection or electric heating when the temperature of an oil layer is less than 130 DEG C, and the gas injection amount is 5,000-7,000 cubic meters every day; when the hydrogen amount produced by someone well is above 500 cubic meters every day, the production well is closed down, while 50 percent of production wells are closed down, the hydrogen is stopped to inject and the hydrogen-injection oil extraction is ended; and the fluid in an aperture enclosed in a low-permeability oil reservoir is heated and expanded to swell the enclosed space burst to form a channel, so that crude oil in the enclosed aperture flows out.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a method for producing crude oil by injecting hydrogen, which is an oil recovery method for improving the recovery rate and development effect of oil reservoirs. Background technique [0002] In some oil fields, it is necessary to inject gas to displace crude oil to flow to production wells. The existing injected gases include natural gas, nitrogen, air, carbon dioxide, etc. These gases cannot be completely integrated into crude oil. The efficiency of replacing crude oil is very low. [0003] In some oil fields, the formation needs to be heated due to wax formation and other reasons. The heating temperature requirement is not very high, but the heating range requirement is very large. [0004] Existing formation heating technologies include steam injection, hot water injection, and air injection to burn the oil layer. If the temperature of the formation heati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/18E21B43/24E21B36/04
Inventor 陈亚平
Owner PETROCHINA CO LTD
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