Provided Services: Nitrogen stimulation, single-well huff and puff and well cluster gas flooding (2012 - present)

Technical Challenges: 1. As the Tahe Oilfield enters the middle and later stages of development, the oil-water interface moves upwards and the remaining oil is mainly trapped in the high parts of the structure, existing in the form of "attic oil" with some enriched in micro-fractures and pores. Conventional elastic recovery and waterflood stimulation cannot effectively develop the remaining oil. 2. The maximum well depth for operations is >7000m.

KERUI Solutions: 1. Independently-developed nitrogen injection tertiary oil recovery technology for fracture-cave reservoirs; 2. Independently-developed nitrogen generator for operations at 7000m with an output pressure of 70MPa.

Provided Services: Nitrogen foam displacement (2014 - present)

Technical Challenges: The viscosity of crude oil on surface in the Tuha Lukeqin Oilfield is 9924mPa·s, making the reservoir a deep ordinary heavy oil reservoir. After water flooding takes effect, water content rapidly increases to over 90%. The significant difference in the oil-water mobility ratio leads to a small injection sweep volume, resulting in a low water flooding recovery rate.

KERUI Solutions: Independently-developed tertiary oil recovery technology through nitrogen foam flooding for heavy oil reservoirs, using nitrogen foam flooding to increase the sweep volume.

Provided Services: Heavy oil viscosity reduction and cold recovery (2017 - present)

Technical Challenges: Reservoirs in the V Oilfield are fracture-type, carbonatite heavy oil reservoirs, with an in-place crude oil viscosity of 2000-10,000mPa·s. In the middle and later stages of development, oil wells in the high parts of the structure have low liquid content and high water content, while oil wells in the middle or low parts are flooded by bottom water, resulting in low oil recovery rate and poor economic benefits.

KERUI Solutions: Independently-developed cold recovery with nitrogen and chemical D, with nitrogen increasing formation energy and replacing attic oil on the top while chemical D improving heavy oil flow capacity and suppressing bottom water rising rate, which effectively increases oil well production and enhances reservoir recovery rate.