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Method for exploiting thickened oil by steam solvent mixed injection

A solvent and steam technology, applied in the fields of mining fluid, earthwork drilling, special data processing applications, etc., can solve the problems of long capital recovery time, low solvent recovery rate, weak profitability, etc., to promote solvent recovery and save steam consumption , accelerated development and oil drainage effects

Pending Publication Date: 2022-01-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are processes such as adsorption of the solvent on the pore surface and dissolution in oil and water in the oil reservoir, resulting in a low recovery rate of the solvent.
Most of the solvent field trial experience shows that when the recovery rate of the solvent is less than 90%, the project profitability is weak
Another challenge of solvent application is the large investment and long payback time

Method used

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  • Method for exploiting thickened oil by steam solvent mixed injection
  • Method for exploiting thickened oil by steam solvent mixed injection
  • Method for exploiting thickened oil by steam solvent mixed injection

Examples

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Embodiment 1

[0065] In this example, steam-solvent mixed injection is used for the following heavy oil reservoirs

[0066] The heavy oil reservoir has a burial depth of 440 meters, a degassed crude oil viscosity of 106,000 mPa s at 50 °C, a porosity of 30%, a permeability of 1.4 Darcy, an oil saturation of 90%, a reservoir thickness of 25 m, and a single well group controlled reserve of 25×100 × 400 × 0.3 × 0.85 = 255,000 tons of original oil reserves,

[0067] The shale content of this heavy oil reservoir is 1.5%. No natural fractures or gas caps have been found in well logging interpretation, and a muddy caprock with a continuous thickness greater than 5 meters is developed on the top of the reservoir. Satisfies the applicable heavy oil reservoir conditions of the method of the present invention.

[0068] The horizontal section of the double horizontal well is 400 meters long, the borehole diameter is 8.5 inches, and the well spacing is 5 meters. The horizontal production well is locate...

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Abstract

The invention discloses a method for exploiting thickened oil by steam solvent mixed injection. The method comprises the following steps of: starting to inject a solvent at the early stage of development, firstly performing high-pressure production, and accelerating cavity expansion and oil drainage; performing pressure reduction production at the middle and later stages of development, improving the utilization efficiency of heat energy, and meanwhile strengthening solvent recovery; heating the solvent, performing phase change, enabling the solvent to enter an oil reservoir in a gas phase form, reaching the front edge under the convection action, condensing, mixing with crude oil, and reducing the viscosity of the crude oil; performing steam solvent mixed injection, reducing the partial pressure of steam, improving the dryness, and reducing the heat loss of a pipeline along the way; performing flash evaporation and heat absorption on hot water and the solvent inside a steam cavity in the pressure reduction process, thereby recovering part of heat energy inside the steam cavity, and transporting to the front edge of oil drainage; and reducing the solubility of the solvent in oil water after pressure reduction, reducing the adsorption quantity on the surface of stratum minerals, and strengthening the recovery of the solvent.

Description

technical field [0001] The invention relates to the field of heavy oil horizontal well injection steam injection production, in particular to a steam-solvent mixed injection production method for heavy oil. Background technique [0002] Steam-assisted gravity drainage (SAGD) deploys dual horizontal wells at the bottom of the reservoir, injects steam continuously from the upper horizontal well, and continuously produces oil from the lower horizontal well. The steam continues to expand upward under the action of overburden, and when it meets cold oil reservoirs, it condenses and releases latent heat. The condensed water and heated crude oil flow to the lower production well under the action of gravity. After reaching the ground, oil and water are separated by demulsification to obtain super thick oil. SAGD takes full advantage of the advantages of strong reservoir control ability and high oil production rate of horizontal wells, and combines the advantages of high recovery of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B49/00G06F30/20
CPCE21B43/2406E21B49/00G06F30/20
Inventor 张胜飞王红庄张忠义苟燕李秀峦孙新革沈德煌
Owner PETROCHINA CO LTD
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