Evaluation method and treatment effectiveness analysis of anti-water blocking agent

Fan, Haiming; Lyu, Jian; Zhao, Jingbing; Zhao, Shuzhi; Geng, Jie; Dai, Caili; Kang, Wanli

doi:10.1016/j.jngse.2016.06.052

Cited by 14 publications

(2 citation statements)

References 45 publications

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“…Furthermore, during the drilling process of the coalbed method, it has been shown that fuzzy ball fluid can increase the strength of the coal rock by reducing the brittleness of the rock and improving its plasticity [34]. After reporting, the pressure-bearing capacity of the original ortho-acidified high-conductivity wormhole was improved without damaging the gas production capacity, and a new production contribution was added [35,36]. At the same time, the macromolecules and surfactants disperse in the fluid system after the fluid enters the formation because the fuzzy ball blocks the leakage channel, stays on the rock surface of the fracture/fracture channel, and forms a compact, scouring-resistant, and high-strength active membrane on the rock surface of the fracture.…”

Section: Mechanisms Of Water Shutoff and Oil Recovery Enhancement Of ...mentioning

confidence: 99%

Experimental and EOR Mechanism Study of Water Shutoff Effects on Fractured Tight Sand Gas Reservoirs Using Fuzzy Ball Fluids

Tao,

Liu,

Wang

et al. 2023

Sustainability

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In recent years, there has been quite a dispute over the water shutoff effect of fuzzy ball fluids in fractured tight sandstone gas reservoirs. The core issue of this dispute is to try and make fuzzy ball fluid stabilize gas during the water shutoff process for sustainable development. In order to solve this dispute, the Linxing He-2 reservoir matrix core and a core with artificial fractures were used to simulate interlayer water, artificial fractures, and water output channels from the side and bottom. Simulated formation water and nitrogen were used as the two-phase flow phase. The breakthrough pressure of the air and water phases was tested after plugging with fuzzy ball fluid in order to simulate and analyze the water shutoff effect of the fuzzy ball fluid and its ability to achieve air establishment and water control. The results of this study show that for the core matrix, the breakthrough pressure gradient for water and gas varied from 0.200 MPa/cm to 0.210 MPa/cm and 0.015 MPa/cm to 0.025 MPa/cm, and for artificial fractured cores, the breakthrough pressure gradient of water and gas varied from 0.035 MPa/cm to 0.040 MPa/cm and 0.015 MPa/cm to 0.020 MPa/cm. These results prove that fuzzy ball fluid can block small-scale water output channels, such as matrix pores, through the polymer film-forming structure, and plug the artistic cracks and large-scale water output channels of the water flowing into the sides and bottom through the accumulation of a large number of fuzzy balls, which greatly improves the flow resistance of water. The amount of fuzzy ball fluid should be carefully adjusted with consideration of the water output and formation conditions. For large-scale water output channels and side and bottom water shutoff operations, it is recommended that the amount of fuzzy balls be increased along with the number of fuzzy balls in the system in order to increase the breakthrough pressure of water and achieve the stable control of air and water. It is believed that the fuzzy balls would quickly change their shapes to match the sizes of fracture channels to enter into fractured reservoirs and that an active hydrophobic membrane would form on the surface of fractured rocks, with macromolecules and surfactants being dispersed in the fluid system. In addition, the interface between the fuzzy balls is also hydrophobic, which would slow down the flow of water and provide a continuous gas percolating channel after aggregating and entering into the fractures. This increases the persistence of water intruding into the formation and does not affect the percolation of the gas of fractured tight sandstone gas reservoirs. This research is of great significance for the EOR of tight sand gas reservoirs and the sustainable development of oil and gas resources in China.

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Section: Mechanisms Of Water Shutoff and Oil Recovery Enhancement Of ...mentioning

confidence: 99%

Experimental and EOR Mechanism Study of Water Shutoff Effects on Fractured Tight Sand Gas Reservoirs Using Fuzzy Ball Fluids

Tao,

Liu,

Wang

et al. 2023

Sustainability

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“…To alleviate water lock in tight reservoirs, industry professionals currently employ physical and/or chemical methods. These strategies, which encompass enhancing production pressure differentials, heating the formation, solvent injection, and acid fracturing, aim to diminish liquid-phase saturation and bolster effective gas permeability [16,[20][21][22]. Among these, chemical methods have gained traction, attributed to their specificity and efficacy.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Gas Recovery in Tight Dolomite Reservoirs: A Study of Water-Lock Damage and Chemical Drainage

Yang,

Fei,

Shi

et al. 2023

Processes

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The Lower Paleozoic Ordovician strata within the Ordos Basin harbor dolomite gas reservoirs are characterized by low porosity (0.98% to 14.2%) and low permeability (0.001 mD to 2.8 mD). Gas extraction from these reservoirs is frequently impeded by water lock due to the intrusion of water-based drilling fluids and the accumulation of formation water, which increase water saturation near the wellbore and significantly decrease gas permeability. This research is pivotal in elucidating water-lock mechanisms and developing water-unlocking strategies for such tight gas reservoirs. Comprehensive analysis through wettability tests, spontaneous imbibition, high-speed centrifugal drainage, and nuclear magnetic resonance (NMR) revealed that Jingbian gas field rocks are predominantly water-wet with a spontaneous imbibition water saturation of 60% to 80%, indicating a high propensity for water lock. The pore structure, mainly within the 200 to 300 nm range, presents challenges as high-speed centrifugation achieves only 70% to 80% water saturation displacement, with a drainage rate of about 20% to 30% and a drastic decline in gas permeability by several orders of magnitude. This study identifies the surfactant sodium dodecyl benzene sulfonate (SDBS) as an optimal agent for enhancing water displacement and gas production. At a 0.1% concentration, SDBS improves drainage rate and permeability by 58.5% and 69.42%, respectively, demonstrating its efficacy in mitigating water lock and enhancing recoverability in tight dolomite reservoirs. These findings serve as a scientific guide for augmenting production in similar geological settings.

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Research on Low Damage Drilling Fluids and Application in Low Permeability Reservoirs of Shengli Oilfield

Liu

Chen

2019

Proceedings of the International Field Exploration and Development Conference 2018

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Evaluation method and treatment effectiveness analysis of anti-water blocking agent

Cited by 14 publications

References 45 publications

Experimental and EOR Mechanism Study of Water Shutoff Effects on Fractured Tight Sand Gas Reservoirs Using Fuzzy Ball Fluids

Experimental and EOR Mechanism Study of Water Shutoff Effects on Fractured Tight Sand Gas Reservoirs Using Fuzzy Ball Fluids

Enhancing Gas Recovery in Tight Dolomite Reservoirs: A Study of Water-Lock Damage and Chemical Drainage

Research on Low Damage Drilling Fluids and Application in Low Permeability Reservoirs of Shengli Oilfield

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