Oil extraction method based on joint injection of hydrogen and carbon monoxide

A carbon monoxide and co-injection technology, which is used in the production of fluids, earth-moving drilling, wellbore/well components, etc. It can solve the problems of easy gas channeling, low oil displacement efficiency of heated oil layers, and inability to advance the oxidation zone.

Active Publication Date: 2011-11-09
PETROCHINA CO LTD
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  • Summary
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  • Application Information

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Problems solved by technology

[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] Injecting air to burn the oil layer or heating the oil layer by low-temperature oxidation. Because of the air injection

Method used

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Examples

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Effect test

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 12 MPa after depleted production. As the temperature of long-term water injection reservoirs decreased, wax began to precipitate in the oil layer, which affected crude oil recovery, so it was decided to carry out the oil recovery method of co-injection of hydrogen and carbon monoxide.

[0021] 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, and the 8 production wells are arranged in a rectangle. Gas injection wells are 100-200 meters away from nearer production wells, and 140-280 meters away from farther production wells. In this embodiment, there are 150 meters from the nearer production...

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 and carbon monoxide recovery.

[0027] 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. The distance between the production well and the gas injection well is 150 meters at the nearest distance, and the farther distance is 200 meters. The gas injection well is connected with equipment for injecting hydrogen and carbon monoxide, the gas injection well is connected with electric heating equipment to heat the gas injected into the formation at the bottom of the well, and the production well is connected with oil production equipment.

[0028] Step 2: Preheat t...

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PUM

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Abstract

The invention relates to an oil extraction method based on the joint injection of hydrogen and carbon monoxide. The method comprises the following steps: injecting hydrogen or carbon monoxide; heating injected gas; heating rock in an immediate vicinity of wellbore to 100-400DEG C; injecting hydrogen and carbon monoxide into a gas injection well, wherein hydrogen injection amount is 1000-100000 cubic meters/ atmosphere every day, and carbon monoxide injection amount is 1000-100000 cubic meters/ atmosphere every day; detecting hydrogen output of production wells; when the hydrogen output of one of the surrounding production wells is above 500 cubic meters everyday, closing the production well; when more than 50% of the production wells are closed, finishing the oil extraction mode of hydrogen and carbon monoxide injection. By the adoption of the oil extraction method, the wettability of rock can be changed so that the rock is changed into rock with strong hydrophily, strong capillary force oil expelling effect is formed so as to improve recovery ratio; fluid in sealed pore spaces in a low-osmosis oil deposit is heated and expanded to spall the sealed spaces so as to form a channel so that crude oil in the sealed pore spaces flows out.

Description

technical field [0001] The invention relates to a method for producing crude oil by co-injecting hydrogen and carbon monoxide, and 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] Injecting air to burn the oil layer or heating the oil layer by low-temperature oxidation. Because of the air injection process, a large number of components in the crude oil can be oxidized, and the oxidizable components are not oxidized, and the oxidation zone cannot advance. The result of a large number of substances being oxidized is that the temperature is too high to be controlled. The range expansion of oxidati...

Claims

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Application Information

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IPC IPC(8): E21B43/24
Inventor 陈亚平
Owner PETROCHINA CO LTD
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