Reservoir protection in drilling through the tight sandstone gas reservoir of Dongsheng Gas Field

FENG Yongchao

doi:10.12143/j.ztgc.2022.05.017

2022 Vol. 49, No. 5

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FENG Yongchao. 2022. Reservoir protection in drilling through the tight sandstone gas reservoir of Dongsheng Gas Field. DRILLING ENGINEERING, 49(5): 118-126. doi: 10.12143/j.ztgc.2022.05.017

Citation:

FENG Yongchao. 2022. Reservoir protection in drilling through the tight sandstone gas reservoir of Dongsheng Gas Field. DRILLING ENGINEERING, 49(5): 118-126. doi: 10.12143/j.ztgc.2022.05.017

Reservoir protection in drilling through the tight sandstone gas reservoir of Dongsheng Gas Field

FENG Yongchao¹

Research Institute of Engineering Technology， North Branch Sinopec， Zhengzhou Henan 450006, China

Received Date: 15 November 2021

Revised Date: 30 April 2022

Abstract

Abstract

The Lower Shihezi Formation of Upper Paleozoic in Dongsheng Gas Field is a tight sandstone reservoir with good physical properties in some areas and natural production potential. There are problems of borehole wall failure and reservoir damage in the drilling process， and the reservoir damage caused by the combination of various factors hinders the release of gas productivity. In order to improve the natural production capacity of the reservoir， and increase the single well production， on the basis of reservoir permeability recovery， through analysis of the reservoir damage factors， the drilling fluid intrusion depth quantitative evaluation method was introduced to learn better the reservoir damage mechanism， and identify the low density， low water loss and soil-free phase and strong sealing drilling fluid as the solution. The waterproof locking agent and the tight pressure compound temporary plugging agent were selected in the laboratory to form a soil-free compound temporary plugging high acid soluble drilling fluid， increasing the permeability recovery to 91.11%， and reducing the mud intrusion depth by 46.28%. The drilling fluid was applied in the Jin-66 well area with the average single well production increased by 11%， and 3 wells realizing natural production； which has improved the effect of efficient exploration and development of tight sandstone reservoirs in Dongsheng Gas Field.
- tight sandstone reservoir /
- intrusion depth /
- injury mechanism /
- reservoir protection /
- natural built to produce /
- Dongsheng gas field

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References

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