Effect of molecular flexibility on the rheological and filtration properties of synthetic polymers used as fluid loss additives in water-based drilling fluid

Chu, Q.; Lin, Ling

doi:10.1039/c9ra00038k

Cited by 36 publications

(41 citation statements)

References 29 publications

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“…Therefore, how to improve the high‐temperature resistance of copolymer type filtrate reducers is one of the hot research topics. It was confirmed that increasing the proportion of rigid monomers in the main chain is propitious to maintain the properties of WBDFs at high temperature 17,33 …”

Section: Introductionmentioning

confidence: 84%

“…The flow characteristic of drilling fluids plays a vital role to solve the drilling problems (such as carry and suspend rock cuttings, ensure hole cleaning). The filtration property refers to the formation of a thin and dense filter cake on the borehole wall by the solid particles in the drilling fluid under the effect of pressure difference between the hydrostatic column pressure of drilling fluid and pressure of fluid in formation pore to prevent the invasion of water into permeable formation 17 . It is directly related to reservoir protection and wellbore stability.…”

Section: Introductionmentioning

confidence: 99%

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Terpolymer with rigid side chain as filtrate reducer for water‐based drilling fluids

Yang

Liu

et al. 2020

J of Applied Polymer Sci

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Synthetic copolymers as filtrate reducers for water‐based drilling fluids (WBDFs) are difficult to meet the needs of drilling engineering only by changing the type and proportion of functional groups of copolymers, especially under ultra‐high temperature and high salinity. In this study, an anionic terpolymer (named PSDI) with rigid side chain was synthesized using sodium p‐styrenesulfonate, N, N‐Dimethylacrylamide, and itaconic acid by free‐radical copolymerization. The chemical structure of PSDI was characterized by Fourier transform infrared spectroscopy and 1H‐NMR spectrum. The high‐temperature/high‐pressure filtration loss (FLHTHP) and the American Petroleum Institute filtration loss (FLAPI) of the WBDFs containing 1.5 wt/vol% PSDI were 35.0 and 17.0 ml after thermal rolling at 240°C for 16 h, respectively. The FLHTHP and FLAPI of the WBDFs containing saturated NaCl were with control of 60.0 and 12.0 ml. The FLAPI of WBDFs containing 1.5 wt/vol% CaCl2 reduced to 6.0 ml. Results indicate that the addition of PSDI can improve the anti‐high‐temperature performance and resistance to salt and calcium contamination of WBDFs. Results of rheological tests through fitting four rheological models suggest that rheological parameters can be improved as a result of forming the spatial network structure between the PSDI and bentonite flakes.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Terpolymer with rigid side chain as filtrate reducer for water‐based drilling fluids

Yang

Liu

et al. 2020

J of Applied Polymer Sci

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“…Drilling fluid formulations-OBM1, OBM2, and OBM3-with various additives. Oil to water phase ratio was 70:30 and the drilling fluid density is 1.61 g/cm 3 . Priamine 1074, Lime, VersaMul, VersaCoat, VersaTrol HT, and barite are commercial trade names of the drilling fluid additives.…”

Section: Synthesis Of Msil-oh Msil-c16 and Msil-ph Organically Modmentioning

confidence: 99%

“…Priamine 1074, Lime, VersaMul, VersaCoat, VersaTrol HT, and barite are commercial trade names of the drilling fluid additives. The density of CaCl 2 brine is 1.1 g/cm 3 . 50 g of Ca-montmorillonite (RevDust) was added into each OBM to replicate the drilled rock contamination effect that occurs during drilling operations.…”

Section: Synthesis Of Msil-oh Msil-c16 and Msil-ph Organically Modmentioning

confidence: 99%

“…It has been well established that the non-productive time (NPT), owing to the deteriorating performance of drilling fluids, has largely amplified the cost of drilling operations and delayed the production of oil and gas from the reservoirs 1 . The principal functions of drilling fluids are [1][2][3][4] (i) suspending and transporting formation cuttings from the bottom of the wellbore to the surface, (ii) suspending formation cuttings during the shutdown of drilling operations, (iii) counter balance the formation pressures to prevent in-flow of gas, oil or water from rocks, (iv) forming a filter cake on the formation surface to improve wellbore stability, and (v) lubricating the drilling tools and drill pipes. There are mainly two types of drilling fluids employed in field operations, oil-based drilling fluids and water-based drilling fluids [5][6][7][8][9][10][11][12][13] .…”

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confidence: 99%

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Organically modified layered magnesium silicates to improve rheology of reservoir drilling fluids

Santra

2020

Sci Rep

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Petroleum well drilling fluids are one of the most significant constituents in the subterranean drilling processes to meet an increasing global demand for oil and gas. Drilling fluids experience exceptional wellbore conditions, e.g. high temperature and high pressure that adversely affect the rheology of these fluids. Gas and oil well drilling operations have to adjourn due to changes in fluid rheology, since the drilling fluids may lose their effectiveness to suspend heavy particles and to carry drilled cuttings to the surface. The rheological properties of drilling fluids can be controlled by employing viscosifiers that should have exceptional stability in downhole environments. Here, we have developed nextgeneration viscosifiers-organically modified magnesium silicates (MSils)-for reservoir drilling fluids where organic functionalities are directly linked through the Si-C bond, unlike the industry's traditional viscosifier, organoclay, that has electrostatic linkages. The successful formation of covalently-linked hexadecyl and phenyl functionalized magnesium silicates (MSil-C16 and MSil-Ph) were confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA). Identical drilling fluid formulations were designed for comparison using MSils and a commercial viscosifier. The rheological properties of fluids were measured at ambient conditions as well as at high temperatures (up to 150 °C) and high pressure (70 MPa). Owing to strong covalent linkages, drilling fluids that were formulated with MSils showed a 19.3% increase in yield point (YP) and a 31% decrease in apparent viscosity (AV) at 150 °C under 70 MPa pressure, as compared to drilling fluids that were formulated with traditional organoclay. The higher yield point and lower apparent viscosity are known to facilitate and increased drilling rate of penetration of the fluids and an enhanced equivalent circulation density (ECD), the dynamic density condition, for efficient oil and gas wells drilling procedures.

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Highly effective utilization of vinyl copolymer as filtrate reducer of water‐bentonite drilling fluid under ultrasonic oscillations

Guo

Peng

2021

J of Applied Polymer Sci

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The water-bentonite drilling fluids incorporating the terpolymer of acrylic acid, acrylamide, and 2-acrylamide-2-methyl propane sulfonic acid were prepared by common mechanical agitation of industrial community with superposition of ultrasound. Various performances of the drilling fluids in the absence and presence of ultrasonic oscillations were evaluated, including fluid loss, rheology, mud cake thickness, and surface appearance, adsorptive capacity of terpolymer on bentonite clay as well as clay particle size and distribution. The results showed that the filtrate volume and mud cake thickness as well as rheological values presented downtrend with the increase of ultrasonic time or power. Scanning electron microscope showed that the more smooth-faced and compact mud cake was formed after ultrasonic oscillations. The analysis of clay particle size confirmed that ultrasonic oscillations could reduce the average particle diameter and broaden the particle size distribution, along with the appearance of ultra-tiny clay particle components. Adsorbed amount of terpolymer on bentonite was enhanced with introduction of ultrasonic oscillations (as confirmed by total organic carbon analysis). The ultrasound-induced dispersion and adsorption stemmed from acoustic cavitation and could cooperate with each other, together improving filtration properties.

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Effect of molecular flexibility on the rheological and filtration properties of synthetic polymers used as fluid loss additives in water-based drilling fluid

Abstract: The effect of molecular flexibility on the rheological and filtration properties of synthetic polymers used as fluid loss additives in water-based drilling fluid was investigated.

Cited by 36 publications

References 29 publications

Terpolymer with rigid side chain as filtrate reducer for water‐based drilling fluids

Terpolymer with rigid side chain as filtrate reducer for water‐based drilling fluids

Organically modified layered magnesium silicates to improve rheology of reservoir drilling fluids

Highly effective utilization of vinyl copolymer as filtrate reducer of water‐bentonite drilling fluid under ultrasonic oscillations

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