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Method and device for downhole cycle huff and puff recovery using supercritical carbon dioxide

A carbon dioxide and supercritical technology, which is applied in the fields of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of insufficient carbon dioxide recovery and increased greenhouse gas volume, so as to achieve less environmental pollution, avoid waste of resources, Energy Saving Effect

Active Publication Date: 2019-02-26
巴州广和气体资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, after the existing mine technology performs carbon dioxide cycle throughput, the recovery of carbon dioxide is not in place, and carbon dioxide is generally discharged into the atmosphere, increasing the amount of greenhouse gases

Method used

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  • Method and device for downhole cycle huff and puff recovery using supercritical carbon dioxide
  • Method and device for downhole cycle huff and puff recovery using supercritical carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 Taking the R53 block of JL Oilfield as the research object, a geological structure model, a sedimentary facies model and an attribute model under facies control are established for multiple wells in the block, and at the same time, the numerical simulation of production and water cut is completed on the basis of the geological model. For the fitting work, taking Well R53-3 in this block as an example, the oil production cycle huff and puff of this well was simulated to verify the feasibility of this method.

[0052] Well R53-3 is a horizontal well, where the interlayer interference is small, the oil layer is well sealed, and the gas injection trap can be formed. At the same time, the permeability of this area is low, and the pressure and temperature of the oil layer are high, which meets the requirement of supercritical injection. carbon dioxide conditions.

[0053] According to this embodiment, the method for downhole periodical huff and puff recovery usin...

Embodiment 2

[0076] Such as figure 2 As shown, Embodiment 2 proposes a device for downhole periodic huff and puff oil recovery using supercritical carbon dioxide.

[0077] According to Embodiment 2, the device for downhole periodic huff and puff oil recovery utilizing supercritical carbon dioxide comprises: a carbon dioxide storage tank 110, a heater 120, a booster pump 130, a gas-liquid separator 140, an oil-water separator 150, an oil-gas mixing pump 160, an oil-gas Separator 170, oil storage tank 180.

[0078] The carbon dioxide storage tank 110, the heater 120, the booster pump 130 and the oil storage tank 180 are all arranged outside the well, and the gas-liquid separator 140, the oil-water separator 150, the oil-gas The mixing pump 160 and the oil-gas separator 170 are both arranged in the well; the carbon dioxide storage tank 110 is connected to the heater 120, and the heater 120 is connected to one end of the booster pump 130, and the booster pump The other end of 130 goes deep ...

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Abstract

The invention relates to a method for performing underground periodic huff-puff oil extraction by utilizing supercritical carbon dioxide. The method comprises the following steps: injecting the supercritical CO2 into well bottom and then dissolving in an oil-water mixed liquid in the well; injecting the oil-water mixed liquid into a gas-liquid separator; converting the supercritical CO2 into non-supercritical CO2; separating CO2 from an oil-water mixture; feeding the separated CO2 into an oil-gas mixing pump; feeding the oil-water mixed liquid into an oil-water separator; injecting the separated water into a ground layer; feeding the separated crude oil into the oil-gas mixing pump, thereby mixing the crude oil with CO2; pressurizing the oil-gas mixing pump to a gas lift condition, thereby lifting the crude oil containing CO2 to an oil-gas separator on the ground; separating CO2 in the oil-gas separator from the crude oil. The method provided by the invention has less pollution to the environment; the extracted water is treated underground and then is directly injected into the ground layer; the extracted gas is recyclable; the whole technological process is simple; the loss in the process is less; the method is suitable for an oil field extraction technique.

Description

technical field [0001] The invention relates to a method and a device for utilizing supercritical carbon dioxide to perform downhole periodic huff and puff oil recovery. Background technique [0002] In the natural atmosphere, carbon dioxide mainly exists in gaseous form. Due to the high solubility of carbon dioxide in crude oil, it leads to the expansion of crude oil and the reduction of crude oil viscosity, which makes the carbon dioxide flooding and oil recovery process popular. [0003] The existing carbon dioxide huff and puff technology uses gaseous carbon dioxide, which has low density and low solubility in crude oil, which cannot reduce the viscosity of crude oil in a large area, and the oil displacement efficiency is low. The principle of conventional gas lift oil recovery is to rely on the high-pressure gas injected from the ground to mix with the fluid produced in the oil layer in the wellbore, and use the expansion of the gas to reduce the viscosity of the mixed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16
CPCY02P90/70
Inventor 柏明星宋考平付晓飞杨二龙李玉伟贺凯
Owner 巴州广和气体资源有限公司
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