scholarly journals "PP type" self-assembling peptides with superior rheological properties

2021 ◽  
Author(s):  
Fangmin Li ◽  
Lichang Gao ◽  
Xudong Zhang ◽  
Pin Wang ◽  
Yuanxue Liu ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Gel Strength ◽  
Self Assembling

The ionic-complementary self-assembling peptides discovered by Zhang Shuguang have solution-to-gel (sol-gel) transition capacity and one such peptide RADA16 has been commercialized into hemostatic agents. However, their sol-gel transition ability was...

Development of New Models to Determine the Rheological Parameters of Water-based Drilling Fluid Using Artificial Intelligence

2021 ◽  
Author(s):  
Farqad Hadi ◽  
Ali Noori ◽  
Hussein Hussein ◽  
Ameer Khudhair
Keyword(s):  
Rheological Properties ◽  
High Performance ◽  
Drilling Fluid ◽  
Gel Strength ◽  
Solid Content ◽  
Rheological Parameters ◽  
Water Based ◽  
Fluid Properties ◽  
Drilling Operations ◽  
Marsh Funnel

Abstract It is well known that drilling fluid is a key parameter for optimizing drilling operations, cleaning the hole, and managing the rig hydraulics and margins of surge and swab pressures. Although the experimental works present valid and reliable results, they are expensive and time consuming. On the other hand, continuous and regular determination of the rheological mud properties can perform its essential functions during well construction. More uncertainties in planning the drilling fluid properties meant that more challenges may be exposed during drilling operations. This study presents two predictive techniques, multiple regression analysis (MRA) and artificial neural networks (ANNs), to determine the rheological properties of water-based drilling fluid based on other simple measurable properties. While mud density (MW), marsh funnel (MF), and solid% are key input parameters in this study, the output functions or models are plastic viscosity (PV), yield point (YP), apparent viscosity (AV), and gel strength. The prediction methods were demonstrated by means of a field case in eastern Iraq, using datasets from daily drilling reports of two wells in addition to the laboratory measurements. To test the performance ability of the developed models, two error-based metrics (determination coefficient R2 and root mean square error RMSE) have been used in this study. The current results of this study support the evidence that MW, MF, and solid% are consistent indexes for the prediction of rheological properties. Both mud density and solid content have a relative-significant effect on increasing PV, YP, AV, and gel strength. However, a scattering around each fit curve is observed which proved that one rheological property alone is not sufficient to estimate other properties. The results also reveal that both MRA and ANN are conservative in estimating the fluid rheological properties, but ANN is more precise than MRA. Eight empirical mathematical models with high performance capacity have been developed in this study to determine the rheological fluid properties based on simple and quick equipment as mud balance and marsh funnel. This study presents cost-effective models to determine the rheological fluid properties for future well planning in Iraqi oil fields.

scholarly journals Analyzing Cement Rheological Properties Using Different Additive Schemes at High Pressure and High Temperature Conditions

2020 ◽  
Vol 39 (3) ◽  
pp. 466-474
Author(s):  
Khalil Rehman Memon ◽  
Aftab Ahmed Mahesar ◽  
Shahzad Ali Baladi ◽  
Muhannad Talib Sukar
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Rheological Properties ◽  
Silica Fume ◽  
Gel Strength ◽  
Water Quantity ◽  
Fluid Loss ◽  
Cement Slurry ◽  
Three Samples ◽  
Loss Control

The experimental study was conducted on rheological properties in laboratory to measure the integrity of cement slurry. Three samples were used and analyzed at different parameters to check the elasticity of cement slurry. Additives with various concentrations, i.e. silica fume % BWOC (Present by Weight on Cement) (15, 17, 19 and 21), dispersant % Wt (Percent Weight) (0.21, 0.26 and 0.31) and additional 1; % Wt of fluid losscontrol were used to improve the performance of the cement slurry at the temperature of 123oC. The results have shown that increase in the concentration of dispersants that have caused to decrease in the Plastic Viscosity (PV), Yield Point (YP) and GS (Gel Strength). The rheological properties of cement were improved with the addition of fluid loss control additive in 21 % BWOC (Present by Weight on Cement) silica fume increase the water quantity in cement slurry that improve its durability and to reduce the strength retrogression in High Temperature High Pressure (HTHP) environment. Results were achieved through HTHP OFITE Viscometer (Model 1100).

scholarly journals Effect of bacterial cellulose nanofibers incorporation on acid-induced casein gels: microstructures and rheological properties

2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Kai Yuan ◽  
Xiaofei Li ◽  
Xudong Yang ◽  
Shuai Luo ◽  
Xi Yang ◽  
...  
Keyword(s):  
Phase Separation ◽  
Rheological Properties ◽  
Bacterial Cellulose ◽  
Structural Properties ◽  
Gluconic Acid ◽  
Cellulose Nanofibers ◽  
Gel Strength ◽  
Structural Homogeneity ◽  
Mechanical And Structural Properties ◽  
Addition Amount

Abstract In this study, the effect of bacterial cellulose nanofibers (BCNF) incorporation on the structural and rheological properties of casein gels was investigated, where the mixed BCNF and casein gels were prepared by adding gluconic acid δ-lactone (GDL) to acidify the mixed polymer solutions at 3.0% casein concentration (w/v) and varying BCNF concentrations (0–0.5%, w/v). By changing the addition amount of GDL, the mechanical and structural properties of the mixed gels were studied at above, near and below the electric point (pI) of the casein. At pH above the pI of the casein, the introduction of BCNF initially increased the gel strength, but further addition of BCNF weakened the mixed gels. At near and below the pI of the casein, the incorporation of BCNF continuously increased the gel strength. Besides, all gels showed good structural homogeneity, without macroscopic phase separation occurring, which indicated good compatibility of BCNF with the casein gels.

scholarly journals The application of MWCNT to enhance the rheological behavior of drilling fluids at high temperature

2017 ◽  
Vol 12 (3) ◽  
Author(s):  
Abdul Razak Ismail ◽  
W. R. W Sulaiman ◽  
M. Z. Jaafar ◽  
A. Aftab ◽  
A. A. Razi ◽  
...  
Keyword(s):  
High Temperature ◽  
Rheological Properties ◽  
Rheological Behavior ◽  
Oil And Gas ◽  
Drilling Fluid ◽  
Gel Strength ◽  
Drilling Fluids ◽  
Deep Wells ◽  
Multi Walled Carbon Nanotube ◽  
Filtrate Loss

Drilling fluid is the key component to drill oil and gas wells. The rheological behavior of drilling fluid will be affected when drilling deep wells especially at high temperature and high pressure reservoir. This research was conducted to study the effect of the nanoparticles over the rheological properties of the drilling fluid when aging at high temperature condition. Several drilling fluids were prepared using synthetic based fluids (Sarapar and Saraline) to study the effect of multi-walled carbon nanotube (MWCNT) at different concentrations. The rheological properties of drilling fluid were analyzed after aging at 250 °F and 350 °F for 16 hours. The results revealed that the addition of MWCNT improved the 10-sec gel strength by 33% and filtrate loss volume was reduced to 10% after aging at 250°F in Saraline drilling fluid. Moreover, the plastic viscosity of Saraline and Sarapar drilling fluid after addition of MWCNT was enhanced by 6% and 27% at 350 °F. Filtrate loss volume of Sarapar drilling fluid was reduced by 19 % after aging at 250 °F for 16 hours. The overall results showed that the addition of MWCNT into the drilling fluid have slightly improved the rheological properties of drilling fluids under high temperature conditions.

scholarly journals Enhancement of the rheological properties of bentonite mud using natural polymers

2021 ◽  
Vol 7 (1) ◽  
pp. 047-059
Author(s):  
Muhammed Rufai ◽  
Koyejo Oduola
Keyword(s):  
Rheological Properties ◽  
Corn Starch ◽  
Potato Starch ◽  
Drilling Fluid ◽  
Research Work ◽  
Cassava Starch ◽  
Gel Strength ◽  
Natural Polymers ◽  
Saw Dust ◽  
Before And After

This research work focuses on finding more effective polymers that can improve the rheological properties of bentonite mud. Various mud samples were formulated with natural polymers obtained from corn starch, cassava starch, purple potato starch, yellow potato starch and saw dust consisting of different masses which were not treated or purified by any chemical method before and after preparation along with the control mud. Rheology tests were carried out to determine the plastic viscosity, apparent viscosity, yield point, gel strength among others. API standards were followed throughout the experimental study and the result from this investigation showed that increasing the concentration of polymers enhances the mud rheological properties studied at ambient condition, wherein thermal stability was exhibited up till 100°C. Thus, environmental friendly alternatives have been discovered for drilling fluid additives which are cheap, organic, bio-degradable, non-toxic and easily available

scholarly journals Rheology of Yanang solution: Effect of temperature, pH and divalent cation

2014 ◽  
Vol 17 (1) ◽  
pp. 87-93
Author(s):  
Vi Ngoc Ha Vu ◽  
Viet Bao Nguyen ◽  
Long Tien Vu
Keyword(s):  
Low Temperature ◽  
East Asia ◽  
Rheological Properties ◽  
Divalent Cation ◽  
Shear Thinning ◽  
Gel Strength ◽  
Effect Of Temperature ◽  
South East Asia ◽  
The Impact

The main objective of this work was to study rheological properties of Yanang (Tiliacora triandra) solution; a kind of food that derived from plants is being widely used in many countries in South East Asia and East Asia. Experiments were conducted to evaluate the impact of temperature on the viscosity and then build rheological curves of products. The results showed that viscosity of Yanang solutions changes with temperature in the shear - thinning models. These solutions formed gel at low temperature and gel strength can be improved by adjusting pH and adding Ca2+ due to the presence of uronic axit residues on the backbone of Yanang gums.

scholarly journals Rheological Studies of Physical Soy Protein Gels

2016 ◽  
Vol 4 (Special-Issue-October) ◽  
pp. 18-25 ◽  
Author(s):  
A.E Labropoulos ◽  
T. H Varzakas
Keyword(s):  
Rheological Properties ◽  
Soy Protein ◽  
Strength Function ◽  
Sol Gel ◽  
Viscoelastic Behavior ◽  
Testing Procedure ◽  
Gel Strength ◽  
Gel Point ◽  
Protein Isolates ◽  
Soy Protein Isolates

Many naturally-occuring gels exists in the biological systems such as foods. Because of their biodiversibily and delicate nature, their properties can be used by the food industry to achieve a variety of physicochemical functions. The gel utilized in this study, soy protein isolates (SPI) and concentrates (SPC), all have unique rheological properties which play an important role in their strength function of foods. The objective of this study is to gain insights as to how the rheological properties of these bio-gels are designed to control the gel-strength of these materials. The concentration dependence of dynamic moduli G’ and G” of soy protein isolates (SPI) and soy protein concentrates were studied in solutions prepared under different conditions. Three-level preliminary fractional experiments were undertaken to study effects of temperature, pH, and concentration on the gel-strength of these products. Protein concentration, pH and temperature appear to have an impact on the strength of these bio-gels. An investigation of the viscoelastic behavior of SPI solution at the sol-gel transition point was mainly considered by applying a rheological testing procedure. The data demonstrated a power law frequency dependence of the viscoelastic functions G΄(ω) and n*(ω) at the gel point. At low temperatures and high concentrations we get weaker gel-strengths than at high temperatures and low concentrations. Lowering the concentration and keeping the temperature constant seem to have little effect on the gel strength but points towards to becoming stronger gels.

scholarly journals Improvement of Locally Available Raw Bentonite for Use as Drilling Mud

2017 ◽  
Vol 11 (1) ◽  
pp. 274-284
Author(s):  
Kaffayatullah Khan ◽  
Shaukat Ali Khan ◽  
Muhammad Umair Saleem ◽  
Muhammad Ashraf
Keyword(s):  
Rheological Properties ◽  
Yield Point ◽  
Carboxymethyl Cellulose ◽  
Drilling Fluid ◽  
Gel Strength ◽  
Plastic Viscosity ◽  
Drilling Process ◽  
Drilling Operation ◽  
Bentonite Clays ◽  
Filtrate Loss

Background: Bentonite clays are widely used in a drilling operation and play a vital role as a drilling fluid. Bentonite clay mud performs several functions during the drilling operation and facilitates the drilling process. Objective: In this study, the locally available raw bentonite clays were investigated to evaluate its potential use as a mud for borehole drilling operation after its improvement with the additives. Method: Rheological properties such as plastic viscosity, yield point and gel strength were evaluated by using a viscometer and filtrate loss test was performed by using filter press on both locally available raw bentonite clays and the commercial bentonite named as Mill gel. Results: From the test results obtained for the up gradation of clays with the different beneficiating materials, the drastic increase in the plastic viscosity, yield point and gel strength has been observed. It shows that Xanthum gum produced better results for the improvement of rheological properties of such clays. Carboxymethyl cellulose and starch were used as additives and it has been observed that carboxymethyl cellulose has improved both viscosity and filtrate loss control, whereas starch muds have the best filtration control properties. Conclusion: Improved bentonite clays have rheological and filtration characteristics that have satisfied American Petroleum Institute specification at optimum conditions of clay. It was concluded that improved clays are the suitable material for the drilling operations and suitable to substitute commercial bentonite.

scholarly journals Improving the Rheological Properties of Water Based Mud with Moringa oleifera Leaves

2019 ◽  
pp. 1-9
Author(s):  
Tecla C. Biwott ◽  
Onyewuchi Akaranta ◽  
Ambrose K. Kiprop ◽  
Oriji Boniface
Keyword(s):  
Rheological Properties ◽  
Moringa Oleifera ◽  
Gel Strength ◽  
Fluid Loss ◽  
Drilling Mud ◽  
Isolation And Characterization ◽  
Standard Procedures ◽  
Water Based ◽  
Moringa Oleifera Leaves ◽  
Loss Control

This paper aimed at improving the water-based drilling mud using Moringa oleifera (M. Oleifera) plant leaves. The rheological properties (plastic viscosity (PV), yield point (YP), and gel strength) of the mud were measured using standard procedures. The mud weight was not affected by M. oleifera concentration (10.03-10.63 pounds per gallon (ppg)). pH of the formulated mud decreased by 28% with increasing concentration of the M. oleifera leaves. The highest PV (33cP) was recorded by mud with 1% M. oleifera leaves at 50ºC while the least value (22cP) was given by control mud at 70ºC temperature. Highest YP (57 1b/100ft2) was recorded by mud sample with 4% concentration of M. oleifera leaves while 1% gave the lowest YP value of 91b/100ft2 at 30ºC and 49ºC respectively.  Gel strength at 10 seconds showed improvement with 2% concentration of leaves by recording maximum of 5 1 b/100 ft2 at 70ºC while the lowest gel strength was recorded by 1% leaves concentration at 49ºC. A good gel strength (30.21 b/100 ft2) at 10 minutes was recorded by mud sample with 3% leaves of M. oleifera at temperature of 30ºC. The results indicated that the M. oleifera leaves significantly improved the rheological properties of the mud. It was also observed that the mud weight of formulated muds with M. oleifera leaves were not affected which leads to stability of the wellbore if the formulation is used.  These great result calls for the need to use M. oleifera leaves to improve rheological properties of the drilling mud. An investigation of M. oleifera as fluid loss control should be done as well as need to carry out isolation and characterization of the active ingredients from M. oleifera leaves so as to establish the compound (s) associated with its activity in drilling mud.

Anisotropic Nano-Platelets to Develop Gel Strength at High Temperature in Aqueous Fluids

2021 ◽  
Author(s):  
Hasmukh Patel ◽  
Gadam Myratgeldiyev
Keyword(s):  
High Temperature ◽  
Rheological Properties ◽  
Sol Gel ◽  
Aqueous Dispersion ◽  
Ionic Species ◽  
Aqueous System ◽  
Gel Strength ◽  
Drilling Fluids ◽  
Higher Temperature ◽  
Covalently Linked

Abstract Aqueous fluids also refer as water-based drilling muds (WBMs) have considered as the most favorable WBMs, owing to their inherent advantages such as economically viability and environmentally benign characteristics. The major problems WBMs encountered is thinning of drilling fluids while drilling under high pressure high temperature. The detrimental rheological properties of WBMs under HPHT result into pipe sticking, low rate of penetration of the drill bit and requirement of high torque for drilling operations. The hydrophilic clays have been employed as viscosifiers in WBMs to maintain the rheological properties, albeit, their viscosifying characteristics have hindered in the presence of ionic species in the aqueous system at high temperature. These shortcomings can be tackled by developing an additive that can exhibit neutral surface changes and ability to undergo gelation at higher temperature. We have developed an additive functionalized with polar groups on anisotropic nano-platelets (LMS) through sol-gel technique. Spectroscopic and crystallographic characterization of LMS have proved the formation of layered structures with covalently linked polar functionalities. The viscoelastic studies were conducted on aqueous dispersion of these nano-platelets at different temperature, which revealed an unprecedented phenomenon -increase in gel strength at higher temperature, a key property required for ideal WBMs. LMS nano-platelet has shown formation of network structure in aqueous medium to boost storage modulus of the fluid. This additive can overcome the demerits associated with natural hydrophilic layered silicates and improve the rheological properties under challenging well conditions.

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