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Density cutting volume fracturing technology for horizontal wells in the ultra-low permeability reservoirs: a case study of the Yuan284 area in the Huaqing oilfield Ordos Basin, China

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Abstract

The ultra-low permeability reservoir in the Huaqing oilfield presents characteristics of an obvious non-Darcy seepage, a difficult matrix displacement, the channeling of injected water along water flooding-induced fractures, and the low production of a single horizontal well. Water injection development is difficult to adapt with regard to current economic development. It is urgent to explore effective development mode of horizontal wells in ultra-low permeability reservoirs, that is, to transform the water-flooding development mode. Based on the mechanism of imbibition oil recovery, through indoor numerical simulation and field tests, this paper innovatively presents the large-scale volume fracturing of horizontal wells and establishes a new development model of “make-up pressure tightness production” integrating comprehensive energy supplementation, old fracture plugging, synchronous transformation, and volume fracturing for the first time, which surpasses the traditional water drive characteristics and is successfully applied to the Yuan284 block of the ultra-low permeability reservoirs in the Huaqing oilfield. Through the three-dimensional transformation of the reservoir, this model increases the complexity of fractures, realizes the transformation of seepage from a linear flow to a complex fracture network, establishes the development mode of imbibition displacement + differential pressure mass transfer, changes from well-controlled reserves relying on water drive to fracture-controlled reserves relying on seepage, and finally greatly improves the production and recovery of single wells. It is concluded that changing the water injection development mode provides new ideas and technical support for the development of horizontal wells in other similar ultra-low permeability reservoirs.

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Authors and Affiliations

  1. No. 10 Oil Production Plant, Changqing Oilfield, Gansu, 745100, China

    Wang Ce, He Shanbin, Wang Mingyu & Xue Fafeng

Authors
  1. Wang Ce
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  2. He Shanbin
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  3. Wang Mingyu
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  4. Xue Fafeng
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Correspondence to Wang Ce.

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Responsible Editor: Santanu Banerjee.

Highlights

• Yuan 284 changed the development model. Through indoor numerical simulation and field test, it innovatively proposed large-scale volume fracturing of horizontal wells and established a new development model of “make-up pressure stuffy production” integrating “comprehensive energy supplement, old fracture plugging, synchronous transformation, and volume fracturing” for the first time.

• Through the three-dimensional transformation of the reservoir, this model increases the complexity of fractures, realizes the transformation of seepage from linear flow to complex fracture network, establishes the development mode of imbibition displacement + differential pressure mass transfer, changes from well-controlled reserves relying on water drive to fracture-controlled reserves relying on seepage, and finally greatly improves the production and recovery of single wells.

• The large-scale volume fracturing of horizontal wells in the Yuan284 area has achieved good results. For the volume fracturing of conventional horizontal wells, the average daily oil production of horizontal wells is more than 10.0 tons after the test. It is predicted that the final recovery rate will be increased from 5.3 to 12.3%, and the single-well production and recovery rate in the test area will be greatly improved.

• A test of yuan284 transformation of development mode, which provides a reference for the development technology of horizontal wells in ultra-low permeability reservoirs.

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Ce, W., Shanbin, H., Mingyu, W. et al. Density cutting volume fracturing technology for horizontal wells in the ultra-low permeability reservoirs: a case study of the Yuan284 area in the Huaqing oilfield Ordos Basin, China. Arab J Geosci 15, 1409 (2022). https://doi.org/10.1007/s12517-022-10657-7

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  • DOI: https://doi.org/10.1007/s12517-022-10657-7

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