Permeability damage micro-mechanisms and stimulation of low-permeability sandstone reservoirs: A case study from Jiyang Depression, Bohai Bay Basin, China

ZHANG Shoupeng; FANG Zhengwei

doi:10.11698/PED.2020.02.13

2020 , Vol. 47 >Issue 2: 349 - 356

DOI: https://doi.org/10.11698/PED.2020.02.13

OIL AND GAS FIELD DEVELOPMENT

Permeability damage micro-mechanisms and stimulation of low-permeability sandstone reservoirs: A case study from Jiyang Depression, Bohai Bay Basin, China

ZHANG Shoupeng ,
FANG Zhengwei

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1. Research Institute of Petroleum Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, China;
2. Key Laboratory of Shale Oil/Gas Exploration and Production, Sinopec, Dongying 257015, China;
3. Shale Oil Research and Development Center of National Energy Administration, Dongying 257015, China;
4. Key Laboratory of Sedimentary Simulation and Reservoir Evaluation, Shengli Oilfield Company, Sinopec, Dongying 257015, China;
5. School of Geosciences, China University of Petroleum (East China), Qingdao 266580, China

Received date: 2019-06-19

Revised date: 2020-02-04

Online published: 2020-03-21

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Abstract

According to the characteristics of "structural elements" (framework grain, interstitial material and pore throat structure) of low-permeability sandstone reservoir, the "step by step dissolution and separation" acidification and acid fracturing technology has been developed and tested in field. There are three main mechanisms affecting permeability of low-permeability sandstone reservoir: (1) The mud fillings between the framework grains block the seepage channels. (2) In the process of burial, the products from crystallization caused by changes in salinity and solubility and uneven migration and variation of the syn-sedimentary formation water occupy the pores and throat between grains. (3) Under the action of gradual increase of overburden pressure, the framework grains of the rock is compacted tighter, making the seepage channels turn narrower. The "step by step dissolution and separation" acidification (acid fracturing) technology uses sustained release acid as main acidizing fluid, supramolecular solvent instead of hydrochloric acid to dissolve carbonate, and a composite system of ammonium hydrogen fluoride, fluoroboric acid, and fluorophosphoric acid to dissolve silicate, and dissolving and implementing step by step, finally reaching the goal of increasing porosity and permeability. By using the technology, the main blocking interstitial material can be dissolved effectively and the dissolution residual can be removed from the rock frame, thus expanding the effective drainage radius and increasing production and injection of single well. This technology has been proved effective by field test.

Key words： Jiyang Depression; low permeability sandstone; permeability damage; structural element; dissolution; separation; reservoir stimulation; increasing production and injection

Cite this article

ZHANG Shoupeng , FANG Zhengwei . Permeability damage micro-mechanisms and stimulation of low-permeability sandstone reservoirs: A case study from Jiyang Depression, Bohai Bay Basin, China[J]. Petroleum Exploration and Development, 2020 , 47(2) : 349 -356 . DOI: 10.11698/PED.2020.02.13

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