A single horizontal well solvent-assisted production method

Abstract

The invention provides a single horizontal well solvent-assisted production method. The method includes: step 1: deploying a single horizontal well pattern, and the distance between the horizontal section of the horizontal well and the bottom of the reservoir is less than 1m; step 2: injecting C1-C4 organic compounds through a long pipe at a pressure greater than the dew point of the compound gas solvent Composite gas solvent with CO2; Step 3: Shut down the well for 1-2 days, heat the horizontal section of the horizontal well, and stop heating when it reaches 50-70°C; Step 4: Use long pipes with thin oil, short Pipe oil production is used for production, and the production process lasts for two days. When the downhole pressure is lower than 1MPa, the compound gas solvent is injected through the long pipe, and step 3 is repeated. The injection volume of the compound gas solvent is 1-3 times the volume of the solvent chamber; Step 5: Repeat Step 2-Step 4. When the recovery rate reaches more than 50% and the mining efficiency is lower than the economic limit, stop mining. The mining method of the invention has low cost per well, low requirements on drilling technology, no water process and low energy consumption.

Description

technical field [0001] The invention relates to an oil reservoir exploitation method, in particular to a single horizontal well solvent-assisted exploitation method of a thin-layer heavy oil reservoir with poor thermal recovery economy, and belongs to the technical field of petroleum exploitation. Background technique [0002] At present, the mainstream development technology of oil reservoir is to use steam injection recovery technology such as steam huff and puff, steam flooding, SAGD and so on. [0003] Among them, the development of heavy oil by SAGD has been successful in Canada and has been commercially applied. Attempts have also been made in China, but some applications are limited by many factors, such as thin reservoirs, deep burial, and edge-bottom water, resulting in large heat loss, slow development speed, low oil-gas ratio, and poor economic efficiency. [0004] However, bi-horizontal wells have high requirements on drilling trajectories, poor parallelism, and...

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Problems solved by technology

Attempts have also been made in China, but some applications are limited by many factors, such as thin reservoirs, deep burial, and edge-bottom water, resulting in large heat loss, slow development speed, low oil-gas ratio, and poor economic efficiency

[0004] However, bi-horizontal wells have high requirements on drilling trajectories, poor parallelism, and large well spacing fluctuations, which seriously affect the development effect

In addition, in the SAGD start-up stage, the traditional thermal communication and fluid communication between 5-meter wells need to consume a lot of water and heat, and the effect is not very good

[0005] Reservoir development with thin thickness, slow development speed, low oil-gas ratio and poor economic efficiency has become a common problem in the process of reservoir development

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