Title: Method for optimization of huff-n-puff gas injection in shale reservoirs

Abstract

Methods for optimization of liquid oil production by huff-n-puff in shale reservoirs to achieve an improved (and optimal) oil recovery factor. The process determines and utilizes the optimum huff and puff times, number of cycles and soaking time under practical operation and reservoir conditions. The huff time in the process is a period so long that the pressure near the wellbore reaches the set maximum injection pressure during the huff period. The puff time in the process is the time required for the pressure near the wellbore to reach the set minimum production pressure during the puff period. Soaking is typically not necessary during the huff-n-puff gas injection in shale oil reservoirs. The number of huff-n-puff cycles is determinable by the time in which the economic rate cut-off is reached.

Inventors:

Sheng, James J.

Issue Date:

2019-11-26

Research Org.:

Texas Tech Univ., Lubbock, TX (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1600321

Patent Number(s):

10487635

Application Number:

15/372,214

Assignee:

Texas Tech University System (Lubbock, TX)

Patent Classifications (CPCs):

E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING

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E - FIXED CONSTRUCTIONS E21 - EARTH DRILLING E21B - EARTH DRILLING, e.g. DEEP DRILLING

E21B43/24 - using heat, e.g. steam injection
E21B43/168 - {Injecting a gaseous medium}
E21B47/06 - Measuring temperature or pressure

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DOE Contract Number:  

FE0024311

Resource Type:

Patent

Resource Relation:

Patent File Date: 12/07/2016

Country of Publication:

United States

Language:

English

Subject:

04 OIL SHALES AND TAR SANDS