Evaluation of permeability damage caused by drilling and fracturing fluids in tight low permeability sandstone reservoirs

Zhang, Lufeng; Zhou, Fujian; Zhang, Shicheng; Li, Zhun; Wang, Jin; Wang, Yuechun

doi:10.1016/j.petrol.2019.01.031

Cited by 105 publications

(17 citation statements)

References 33 publications

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“…The test of water-based drill-in fluids damage utilized a JHMD-II drill-in fluids damage assessment system ( Figure 3) and an Olympus DSX-500 optical digital microscope. The experimental method was based on China Petroleum Standard SY/T 6540-2002 and other literature (Li et al, 2017b;Lufeng et al, 2019). Both dynamic damage and static damage simulation of drill-in fluids were carried out in the drill-in fluids damage assessment electronic balance system.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The experimental method was based on China Petroleum Standard SY/T 6540-2002 and other literature (Li et al., 2017b; Lufeng et al., 2019). Both dynamic damage and static damage simulation of drill-in fluids were carried out in the drill-in fluids damage assessment system.…”

Section: Methodsmentioning

confidence: 99%

“…Although formation damage of conventional natural gas and tight sandstone gas reservoir has been well documented (Dong et al., 2019; Lei et al., 2017; Lufeng et al., 2019; Song et al., 2018; Zhang et al., 2019), few studies which focus on shale formation damage especially for nonmarine shale have been reported, and the details of the mechanism are not well understood.The first aspect involves the shale formation sensitivity damage and water block damage for shale formation. It is generally believed that reservoir sensitivity is the internal cause of reservoir damage and the basis of working fluid damage evaluation (Civan, 2007).…”

Section: Introductionmentioning

confidence: 99%

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A laboratory approach to predict the water-based drill-in fluid damage on a shale formation

Wang

et al. 2020

Energy Exploration & Exploitation

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Shale gas production after drill-in, completion, and hydraulic fracturing is strongly affected by formation damage. In order to determine the damage mechanisms for nonmarine shale reservoir, a series of assessments of sensitivity damage, water block damage, water-based drill-in fluids damage, and water damage to gas diffusion on 20 shale samples obtained from Chang 7 Formation were conducted and analyzed. Results indicate that, in the Chang 7 Formation shale, there is extremely strong stress sensitivity and moderately weak water sensitivity damage. Although the liquid phase invasion depth is shallow and the water block damage is limited, the liquid phase and solid particles would enter the microfractures in the reservoir.The P-1 water-based drill-in fluid is compatible with the Chang 7 Formation shale reservoir which can meet the requirement of Chang 7 Formation shale damage controlling, the effect of water-based drill-in fluid on wellbore stability should be paid more attention. The diffusion coefficient of the shale decreases with the presence of water.A systematic damage evaluation method of working fluid considering the multi-mechanism and multi-scale mass transfer process of shale gas is needed to establish.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A laboratory approach to predict the water-based drill-in fluid damage on a shale formation

Wang

et al. 2020

Energy Exploration & Exploitation

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“…A series of issues are closely related to the wettability of rocks when developing tight sandstone gas reservoirs, such as the reservoir damage caused by the lower flow back rate of drilling and fracturing fluids, as well as the low ultimate gas recovery after formation water is trapped in the reservoir [ 1 , 2 , 3 , 4 ]. Because of the hydrophilicity and tightness of the rock, the capillary effect is significant, and formation water, injected water, and condensate water are easily retained in the flow channels, resulting in a decrease in the gas phase effective permeability.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Superhydrophobic Fluorinated Nano-Emulsion and Its Modification on the Wettability of Tight Sandstone

Fan

Liu

et al. 2022

Materials

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The water-blocking effect is a serious problem when developing tight sandstone gas reservoirs, which can cause a sharp reduction in gas production. Wettability alteration of near-wellbore sand rock surface from superhydrophilicity to superhydrophobicity is an effective method to decrease capillary pressure. In this study, a superhydrophobic fluorinated nano-emulsion was synthesized via a soap-free emulsion polymerization process using methacryloxyethyl trimethyl ammonium chloride, trifluoctyl methacrylate, and styrene as monomers. The effect of the fluorinated monomer concentration on wettability alteration was evaluated by measuring the contact angle of the formation water droplet on the modified glass slides using nano-emulsions with different fluorinated monomer concentrations. The results showed that the nano-emulsion had a good dispersibility and homogeneous particle size of around 90 nm, and with the increase in fluorinated monomer concentration, the contact angle increased. The contact angle was the largest when the fluorinated monomer mass rate concentration reached 50%. The adsorption of nanoparticles could alter the rock wettability from a super hydrophilic state (θ = 7°) to a superhydrophobic state (θ = 150°). The spontaneous imbibition experiments showed that the formation water adsorption quality of the core decreased by 49.7% after being modified by the nano-emulsion. The nano-emulsion showed a good superhydrophobicity and had the potential to be used to reduce the water-blocking damage in the tight gas reservoirs.

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“…According to the results of previous study, the drag reduction performance of slick-water is dependent on the balance between the viscous modulus and the elastic modulus and is determined by the microstructure of the drag reducer. As a decisive factor in fracturing design, fracture flow drag requires research of flow patterns and drag reduction characteristics [18][19][20]. Although research on the pipeline flow has provided us with a foundation, the flow patterns and characteristics in the fractures need further thorough research.…”

Section: Introductionmentioning

confidence: 99%

Drag Reduction Mechanism of Viscoelastic Slick-Water Fracturing Fluid in Tortuous and Rough Fractures

Liu

Fan²,

Zhang

et al. 2021

Geofluids

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Slick-water can effectively reduce the flow drag of fracturing fluid. Many studies have focused on the drag reduction performance of slick-water in wellbore and perforation, but there has been little research on drag reduction characteristics in fracture flow. In this paper, a new visualization experiment system is used to simulate real fracture. The fracture surface is produced through actual triaxial hydraulic fracturing and is copied by a three-dimensional printer using resin material to maintain its shape feature. In comparing the experimental results, it was found that the main factors affecting drag reduction in a fracture are the relative molecular weight and the added concentration. Unlike the flow rule of the drag reducer in a pipeline, when the concentration is greater than 0.10%, a negative DR effect begins to appear. The influence of molecular weight is related to the flow stage; the increasing of molecular weight causes a reduction in DR effect when the flow rate is 0.24 m/s. However, the flow rate exceeds 0.5 m/s; drag reducers with higher molecular weight demonstrate better drag reduction performance. The drag reduction mechanism analysis in fractures was obtained from visualization observations, and the flow characteristics of fluid were characterized by using tracking particles. Drag reduction effect occurs mainly on the surface of the fractures in contrast to near the centre of the flow channel. This research can provide a reference for the experimental study on drag reduction in fractures and is of great significance to the optimization and improvement of drag reducing agent.

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Evaluation of permeability damage caused by drilling and fracturing fluids in tight low permeability sandstone reservoirs

Cited by 105 publications

References 33 publications

A laboratory approach to predict the water-based drill-in fluid damage on a shale formation

A laboratory approach to predict the water-based drill-in fluid damage on a shale formation

Synthesis of a Superhydrophobic Fluorinated Nano-Emulsion and Its Modification on the Wettability of Tight Sandstone

Drag Reduction Mechanism of Viscoelastic Slick-Water Fracturing Fluid in Tortuous and Rough Fractures

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