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Improved steam oil production method

A steam and Christmas tree technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of rock heating and high temperature, reduce clogging of downhole formations, reduce production, increase production and recovery rate effect

Active Publication Date: 2007-12-19
PETROCHINA CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The current conventional steam huff and puff oil recovery has the problem that due to the high temperature of the injected saturated steam, the rock near the wellbore is heated to a high temperature at the same time.

Method used

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Embodiment 1

[0026] Embodiment 1: Take an oil well to carry out improved steam huff and puff oil recovery as an example for illustration.

[0027] A certain oil well has a heavy oil well with a reservoir depth of 1,000 meters, an original formation temperature of 50°C, and a reservoir thickness of 20 meters. The first round of steam huff and puff production was carried out.

[0028] A. Preparatory work: Run the steam injection string composed of high temperature resistant packer and heat-insulated tubing into the wellbore. After the packer is set, install the wellhead Christmas tree; use a steam boiler to prepare saturated steam, and connect the steam boiler Christmas tree tubing outlet;

[0029] B. Injecting steam: refer to accompanying drawing 1. Inject saturated steam into the oil well, the amount of steam injected into the reservoir per meter thickness is 100 cubic meters, the dryness of the bottom hole is 50%, the injection rate is 400 tons / day, the maximum pressure of saturated stea...

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Abstract

The present invention relates to an improved cyclic steam injection oil production method for raising recovery efficiency of oil reservoir and development effect. Said method includes the following steps: steam injection: injecting steam with enough quantity into the oil well; water injection: according to the concrete oil reservoir condition continuously injecting water with 1 -150 deg.C; and sealing well: making limited production.

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 steam huff and puff, which improves the recovery rate and development effect of oil reservoirs. Background technique [0002] The conventional steam huff and puff technology is to inject steam into the heavy oil reservoir, and use the heat carried by the steam to heat the heavy oil. After the heavy oil is heated, the viscosity decreases greatly, and the flow rate from the oil layer to the wellbore increases greatly under the formation pressure, thereby increasing the production. The specific operation plan is to inject a certain amount of steam into the oil layer, and then shut down the well for a period of time to make the heat carried by the steam diffuse to the reservoir. After the stewing well is finished, the well is opened and the blowout is performed. After the self-spraying of the oil well stops, the oil pump is use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
Inventor 陈亚平罗治斌钟太贤张义堂马德胜刘尚奇王春雨李松林吴淑红关文龙韩静张云辉
Owner PETROCHINA CO LTD
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