Co esponding au ho : Adewumi Chizoma Nwakego
Copy igh © 2025 Au ho (s) e ain he copy igh o his a icle. This a icle is published unde he e ms o he C ea i e Commons A ibu ion Liscense 4.0.
Modi ica ion o na u ally occu ing polyme s o enhancing d illing luid
pe o mance: A e iew
Chizoma Nwakego ADEWUMI * and Uchechukwu An hony OGWUDA
Depa men o Pu e and Applied Chemis y, Facul y o Na u al and Applied Sciences, Ve i as Uni e si y Abuja. Nige ia.
Wo ld Jou nal o Ad anced Resea ch and Re iews, 2025, 27(02), 818-831
Publica ion his o y: Recei ed on 28 June 2025; e ised on 10 Augus 2025; accep ed on 12 Augus 2025
A icle DOI: h ps://doi.o g/10.30574/wja .2025.27.2.2925
Abs ac
The pe o mance and e iciency o d illing luids in oil and gas ope a ions a e signi ican ly in luenced by he na u e and
modi ica ion o hei polyme ic addi i es. This e iew in es iga es he ole o na u ally occu ing polyme s (p ima ily
cellulose and s a ch) and he impac o hei chemical, enzyma ic, gene ic, and physical modi ica ions on d illing luid
pe o mance. Na i e o ms o cellulose and s a ch ha e he mal s abili y, solubili y, and heological pe o mance
limi a ions, which es ic hei applica ion in demanding wellbo e en i onmen s. Howe e , h ough modi ica ions such
as ca boxyme hyla ion, ace yla ion, succinyla ion (OSA), c oss-linking, and oxida ion, hese polyme s exhibi imp o ed
physicochemical p ope ies including enhanced iscosi y, educed il a ion loss, and inc eased empe a u e and sal
esis ance. Expe imen al and li e a u e-based analyses show ha c oss-linked and dual-modi ied s a ches a e
pa icula ly e ec i e in high-p essu e, high- empe a u e (HPHT) d illing condi ions. A he same ime, ace yla ed and
ca boxyme hyla ed o ms o e u ili y in mode a e en i onmen s. Despi e p omising physicochemical p o iles, oxidized
s a ch emains unde explo ed o d illing applica ions. This e iew unde sco es he impo ance o polyme selec ion
and a ge ed modi ica ion in designing e icien , en i onmen ally iendly d illing luids o a ious ope a ional
scena ios.
Keywo ds: Cellulose; D illing luid; Modi ica ion; Physicochemical p ope ies; Rheological p ope ies, S a ch.
1. In oduc ion
D illing luids, also called d illing muds, a e special luids used in d illing oil and gas wells. A d illing luid is a complex
blend o wa e , oil, clay-based ma e ials, and a ious chemical addi i es ha ci cula es wi hin a wellbo e o anspo
cu ings o he su ace [1]. I s p ope o mula ion and pe o mance a e essen ial o he success o d illing ope a ions
because hey se e a a ie y o pu poses, such as bo om-hole cleaning, lub ica ing and a cooling agen , con olling high-
p essu e zones and p essu e di e ences be ween he wellbo e and he su ounding subsu ace o ma ions, minimizing
o ma ion damages, educing ci cula ion loss, and emo ing cu ings o he su ace [2-4]. The impac s o d illing luid
canno be o e emphasized, since d illing luid knowledge is essen ial o o a y d illing ope a ions in he pe oleum
indus y. Ac i i ies such as d illing, explo a ion, and p oduc ion canno be ca ied ou wi hou d illing o comple ion
luids. These luids a e he e o e indispensable o bo h onsho e and o sho e oil and gas ope a ions.
Choosing he igh d illing luid in ol es conside ing mul iple ac o s, such as he loca ion and na u e o he o ma ion,
a ia ions in wellbo e p essu e and empe a u e, and he p ope ies o o ma ion luids, s eng h, po osi y, and
pe meabili y. Addi ional conside a ions include p oduc ion equi emen s, en i onmen al impac , and sa e y conce ns
[5]. D illing luids a e gene ally ca ego ized acco ding o hei base luid in o h ee main ypes: wa e -based d illing
luids (WBDFs), oil-based d illing luids (OBDFs), and syn he ic-based d illing luids (SDFs). Each ype o e s dis inc
p ope ies and ad an ages, and he choice o a speci ic d illing ope a ion depends on ac o s such as he o ma ion
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ype, d illing dep h, and applicable en i onmen al egula ions [6,7]. The abili y o d illing luid o ul ill i s mul iple
unc ions is la gely de e mined by i s heological p ope ies, which di ec ly in luence d illing e iciency, sa e y, and
o e all success. Key heological pa ame e s include densi y, iscosi y, gel s eng h, and luid loss. The use o d illing
luid addi i es, such as iscosi ie s, luid loss con ol agen s, weigh ing agen s, hinne s, and los ci cula ion ma e ials
(LCMs), is also de e mined by he d illing condi ions, o ma ion cha ac e is ics, and egula o y equi emen s. [8]. The
pa icula unc ion o be ca ied ou by a d illing luid in a speci ic si e de e mines i s composi ion and he luid o be
used.
Common addi i es used in d illing luid o mula ions include weigh ing agen s such as ba ium sulpha e (ba i e), calcium
ca bona e (chalk), and hema i e. Viscosi y is adjus ed using hickene s like xan han gum, gua gum, glycol,
ca boxyme hylcellulose, polyanionic cellulose (PAC), nanopa icles, o s a ch [9]. An e ec i e d illing luid should
main ain s able heological p ope ies o e a wide ange o p essu es and empe a u es while minimizing luid loss
h ough he o ma ion o a hin, low-pe meabili y il e cake [10]. Ca e ul selec ion and applica ion o hese addi i es
can enhance d illing luid pe o mance, educe o ma ion damage, and help p e en ope a ional challenges du ing
d illing.
1.1. Na u ally occu ing polyme s o d illing luid o mula ions
Polyme s a e a di e se g oup o d illing luid addi i es cha ac e ized by s ong hyd ophilici y and high hyd odynamic
olume, making hem aluable o enhancing heological p ope ies and imp o ing d illing luid pe o mance [11].
Thei p ima y ole is o upg ade he unc ionali y o simple sys ems, such as clay-based muds, and o p e en ben oni e
loccula ion.
Polyme s used in d illing luids can be classi ied by hei chemical composi ion, unc ion in d illing luids, and o igin.
F om a chemical s andpoin , hey may be anionic, nonionic, o ca ionic [12]. S uc u ally, polyme s can be g ouped in o
linea , b anched-chain, and c osslinked (ne wo ked) ypes.
• Linea polyme s consis o monome chains and include ma e ials such as na u al ubbe , elas ome s,
ca boxyme hyl cellulose, pa ially hyd olyzed polyac ylamide, hyd oxye hyl cellulose, and o he high-elas ici y
polyme s [13–15].
• B anched-chain polyme s con ain side b anches along he main chain, wi h examples including amylopec in,
s a ch, and xan han gum.
• C osslinked polyme s ea u e bonds be ween adjacen mac omolecules, esul ing in insoluble and inelas ic
s uc u es. Examples include epoxy esins in hei cu ing s age and c osslinked xan han gum, a polysaccha ide
p oduced by Xan homonas campes is [13].
Figu e 1 Polyme s o D illing Fluid Fo mula ion
Today, na u ally occu ing polyme s a e modi ied wi h condi ions ha a e speci ically ma ched o enhance he
heological cha ac e is ics o d illing luids. In addi ion, polyme s se e a ious unc ions, such as ac ing as iscosi ie s,
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il a ion con ol agen s, locculan s, and de locculan s. Wi hin d illing luids, hey a e inco po a ed as addi i es o
mi iga e s icking o pipes, co osion inhibi o s, emulsi ie s, oaming agen s, lub ican s, and su ac an s [16]. Na u ally
occu ing polyme s include Cellulose (including CMC and HEC), gua gum, polysaccha ides (Chi osan), queb acho,
s a ch, Tannins, Xan han gum, e c. This e iew will, howe e , ocus mainly on cellulose and s a ch as polyme s o
enhancing d illing luid p ope ies.
2. Cellulose
Cellulose (Figu e 2), a majo s uc u al componen o plan cell walls, is composed o long, unb anched chains o glucose
uni s linked by β-(1→4) glycosidic bonds. Each chain con ains app oxima ely en housand glucose esidues (Ca pi a &
Gibeau , 1993). Hyd oxyl g oups (-OH) p o ude om he chains, allowing hyd ogen bonding wi h adjacen chains. This
ex ensi e hyd ogen bonding esul s in a igid, c oss-linked s uc u e ha p o ides high mechanical s eng h and
ende s cellulose insoluble in wa e . Due o he p esence o β-(1→4) linkages, humans a e unable o diges cellulose, as
i equi es he enzyme β-glycosidase, which is absen in he human diges i e sys em.
Figu e 2 S uc u e o cellulose [16]
3. S a ch
S a ch, ob ained om ce eals, oo s, ube s, and s ems o a ious plan s, exhibi s physicochemical p ope ies ha a y
wi h i s bo anical sou ce. I is a polysaccha ide composed o glucose uni s linked by glycosidic bonds and con ains wo
main polyme s, amylose and amylopec in, whose p opo ions di e depending on he s a ch sou ce. Owing o i s
abundance, low cos , and biodeg adabili y, s a ch has been widely employed in i s na i e and modi ied o ms as a
il a ion con ol agen in d illing muds [17–20]. As he second mos abundan biomass in na u e a e cellulose, s a ch
consis s p ima ily o amylose and amylopec in (Figu e 3). Amylose in luences he gelling beha io o s a ch, as gela ion
esul s om he e-associa ion o i s linea molecula chains. In con as , amylopec in is gene ally la ge and highly
b anched, which limi s polyme mobili y and molecula o ien a ion in aqueous sys ems. The high densi y o hyd oxyl (-
OH) g oups in s a ch molecules impa s s ong hyd ophilic p ope ies, enabling e ec i e dispe sion in wa e [21]. In
d illing applica ions, s a ch ac s as an e icien p o ec i e colloid, educing il a ion loss and enhancing luid iscosi y.
I o e s empe a u e s abili y up o app oxima ely 225 °F, causes minimal iscosi y inc ease, and e ec i ely con ols
luid loss. This unc ionali y is p ima ily a ibu ed o i s abili y o swell and expand h ough he abso p ion o ee wa e
[22].
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Figu e 3 S a ch co-polyme chain wi h amylase and amylopec in componen (16).
3.1. Func ional p ope ies o s a ch
S a ch is a highly e sa ile ma e ial wi h di e se applica ions, la gely a ibu ed o i s compac molecula s uc u e. I s
polyme ic and b anched con igu a ion esul s in ela i ely low solubili y in wa e and a educed capaci y o abso b
wa e and oil. Ne e heless, s a ch possesses excellen swelling powe , s ong gela iniza ion cha ac e is ics, and he
abili y o p oduce ela i ely high iscosi y. I can also o m hin, uni o m ilms and demons a es desi able pas ing
p ope ies, including consis ency, smoo hness, and cla i y [23]. Fu he mo e, s a ch eadily o ms complexes wi h
iodine and o e s ad an ageous eeze– haw and cold s o age s abili y, making i sui able o a wide ange o ood and
indus ial o mula ions. While s a ch is ulne able o hyd olysis by acids and enzymes, i is esis an o mode a e
p essu e and empe a u e. None heless, he enzyma ic diges ibili y alues o na i e s a ches a e compa a i ely lowe
[24].
3.2. Polyme (cellulose and s a ch) modi ica ion
S a ch and cellulose a e usually used in modi ied o ms o d illing luids such as ca boxyme hylcellulose (CMC) o
ca boxyme hyl s a ch (CMS) due o hei solubili y in wa e . These modi ied polyme s and S a ch and i s a ian s a e
among he mos common en i onmen ally benign d illing luid addi i es used o educe il a ion loss and condi ion
d illing luid heology [25]. Modi ied polyme s a e o en used in he pe oleum indus y as wa e plugging and
edi ec ion agen s wi hin ese oi s, c ude oil emulsion b eake s, and d illing luid ea men agen s. When used o
enhance he heological p ope ies o a d illing luid, modi ied s a ch gene ally pe o ms well in educing il a ion loss,
inc easing iscosi y, and s abilizing wellbo es du ing d illing [26]. Mos luid-loss con olling agen s used in d illing
luid o mula ion a e modi ied s a ches. [25]
S a ch in i s na u al o m aces se e al limi a ions ha es ic i s p ac ical use. I ends o ha e poo esis ance o shea
s ess, deg ades when exposed o hea , and su e s om issues like e og ada ion and syne esis. Addi ionally, i s
p ocessabili y and solubili y in common o ganic sol en s a e qui e limi ed. To o e come hese challenges and mee
mode n echnological equi emen s, s a ch unde goes di e en modi ica ion echniques. These modi ica ions a e
designed o imp o e one o mo e o hese d awbacks, he eby inc easing s a ch’s adap abili y and be e aligning i
wi h consume expec a ions [27,28].
S a ch has been modi ied h ough a ious me hods in he las ew decades o p oduce unc ionali ies ele an o
mul iple indus ial applica ions. These modi ica ions include:
• Chemical Modi ica ion
• Enzyma ic Modi ica ion
• Gene ic Modi ica ion
• Physical Modi ica ion
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Chemical Modi ica ion
Chemical modi ica ion deals wi h subs i u ing he unc ional g oups in he s a ch g anules. This depends on he ype o
subs i uen , dis ibu ion o subs i uen , deg ee o subs i u ion, sou ce o s a ch, and he eac ion pa ame e s such as he
ype o ca alys , eac ion ime, concen a ion, and pH. The di e en ypes o chemical modi ica ion include:
Ace yla ion
Chemical modi ica ion by ace yla ion is he mos widely employed me hod, whe e unc ional ace yl g oups a e
in oduced by eac ing wi h he ee hyd oxyl g oups loca ed on he s a ch polyme ’s b anch chains o o m speci ic
es e s. This p ocess ypically in ol es eac i e eagen s such as anhyd ous ace ic acid, inyl ace a e, o oc enyl succinic
anhyd ide (OSA), wi h na i e s a ch unde going es e i ica ion in he p esence o alkaline ca alys s like NaOH, Na₂CO₃,
KOH, o Ca (OH)₂ [29]. The inco po a ion o ace yl g oups dec eases he in e molecula con ac esis ance among s a ch
molecules, he eby enhancing he solubili y and swelling abili y o ace yla ed s a ch ela i e o i s na i e coun e pa .
Due o elec os a ic epulsion o ces, he o ma ion o hyd ogen bonds in ace yla ed s a ch is limi ed as hyd oxyl g oups
and glucose anhyd ous uni s a e con e ed in o ace yla ed g oups. Ace yla ed s a ch wi h low deg ees o subs i u ion
(0.01–0.2) inds applica ions in hickene s, ilm o me s, encapsula ion agen s, adhesi es, ex u ize s, and s abilize s
[30].
C oss Linking
C oss-linking is he mos commonly applied chemical modi ica ion echnique, whe e na i e s a ch eac s wi h a ious
eagen s including phospho yl chlo ide (POCl₃), sodium ime aphospha e (STMP), sodium ipolyphospha e (STPP),
and epichlo ohyd in (ECH). POCl₃ ac s as an e icien c osslinking agen unde alkaline condi ions (pH > 11) and in he
p esence o neu al sal s. Among hese eagen s, STMP is pa icula ly e ec i e and widely used as a ood-g ade addi i e.
Because ECH has limi ed wa e solubili y and pa ially deg ades in o glyce ol, wa e -soluble agen s like POCl₃ and STMP
a e o en a o ed. Addi ionally, c oss-links o med by ECH end o be less uni o mly dis ibu ed compa ed o hose
o med by STMP [31]. C oss-linked s a ch inds b oad applica ions as a iscosi ie and ex u ize , owing o i s enhanced
g anule s abili y agains swelling, ele a ed empe a u es, shea o ces, and acidic en i onmen s. On he o he hand,
oxidized s a ch is cha ac e ized by low iscosi y, high cla i y, and poo empe a u e s abili y, while acid-hyd olyzed
s a ch exhibi s low pas e iscosi y, s ong gel o ma ion, and good wa e solubili y [32]. Figu e 4 p o ides an o e iew
o some ypical c oss-linking eac ions.
Figu e 4 Reac ions o Some Commonly Used C oss-Linking Reagen s (35)
Es e i ica ion
S a ch Es e i ica ion con e s he h ee hyd oxyl g oups on glucosyl esidues in o alkyl o a yl de i a i es. A common
chemical es e i ica ion me hod is ace yla ion, whe e hyd oxyl g oups a e eplaced by inyl ace a e o ace ic anhyd ide
in he p esence o alkaline ca alys s such as NaOH, Ca (OH)₂, o Na₂CO₃ [33,34]. Based on he deg ee o subs i u ion
(DS), ace yla ed s a ches a e classi ied in o h ee ca ego ies. Low DS s a ch es e s (0.01–0.2) a e he mos p e alen and
dissol e eadily in cold wa e . Typically, by eac ing ace a e anhyd ide in an alkaline en i onmen , s a ch ace a es wi h
low DS a e gene a ed, whe e alkali ac i a es na i e s a ch o o m a eac i e in e media e called s a ch alkoxide, which
subsequen ly eac s wi h ace ic anhyd ide [33]. Acco ding o [35], s a ch es e s wi h medium DS (0.1–0.3) exhibi lowe
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wa e solubili y compa ed o hose wi h low DS, while high DS s a ch es e s (2–3) a e soluble in o ganic sol en s bu
insoluble in wa e . Ace yla ion p ima ily a ge s he amo phous egions and he ou e lamellae o c ys alline s a ch
s uc u es [34]. The in oduc ion o bulky ace yl g oups causes s e ic hind ance and s uc u al ea angemen s along
he s a ch chains, which in u n weakens in e molecula in e ac ions and acili a es wa e pene a ion in o he g anules’
amo phous egions, inc easing hei swelling capaci y. Consequen ly, ace yla ion signi ican ly enhances he swelling
powe and solubili y o s a ches de i ed om ice, po a oes, and co n [36]. These changes a e in luenced no only by
DS alues bu also by ac o s such as g anule size dis ibu ion, physicochemical composi ion, and g anule igidi y. Waxy
s a ch, which con ains amylopec in wi h a mo e open s uc u e han non-waxy s a ch, allows as e wa e in il a ion,
esul ing in a mo e p onounced inc ease in swelling powe a e ace yla ion [37].
Ano he es e i ica ion app oach in ol es modi ying s a ch wi h dica boxylic acid anhyd ides like oc enyl succinic
anhyd ide (OSA). The eac ion be ween OSA and s a ch p oduces amphiphilic OSA s a ches possessing bo h hyd ophilic
and hyd ophobic g oups, hese OSA-modi ied s a ches ind wide- anging indus ial uses, including in gels, ilms,
coa ings, encapsula ion, and emulsi ica ion. Thei desi able s abili y, encapsula ion e iciency, in e acial ac i i y, hea
esis ance, nu i ional bene i s, and heological p ope ies ha e ecen ly made OSA s a ch a ocus o conside able
esea ch in e es [38].
Figu e 5 Mechanism o ace yla ion o s a ch.
E he i ica ion
When hyd oxyp opyl g oups a e added o s a ch, hyd ogen bonds in and be ween s a ch chains a e b oken, weakening
he g anula amewo k o he s a ch and inc easing he s a ch chains' eedom o mo emen in amo phous egions.
P opylene oxide and na i e s a ch a e ypically e he i ied wi h an alkaline ca alys o p oduce hyd oxyp opyla ed
s a ches (HPS) [39]. E he i ica ion dec eases syne esis while boos ing iscosi y in s a ch and imp o ing he cla i y in
s a ch pas e. Consequen ly, i is equen ly used in ecipes like puddings, sauces, dipping g a ies, and mo e. The p ocess
o es e i ica ion helps he s a ch o be used as an emulsion s abilize because he s a ch exhibi s a lowe gela iniza ion
empe a u e, diminished e og ada ion, and less p opensi y o gel o ma ion [40].
Oxida ion
S a ch oxida ion in ol es depolyme izing s a ch molecules, and oxida ion o s a ch in ol es inco po a ing ca boxyl and
ca bonyl g oups in o i s polyme chains. F equen ly used oxidizing agen s a e po assium pe mangana e, sodium
hypochlo i e, hyd ogen pe oxide, and pe sul a e. The cha ac e is ics o he esul ing oxidized s a ch de i a i es depend
la gely on he speci ic oxida ion me hod and he eagen s applied [41]. This oxida ion p edominan ly a ge s he
hyd oxyl g oups a he C-2, C-3, and C-6 posi ions o he D-glucopy anosyl uni . Compa ed o na i e s a ch, oxidized
s a ch ypically shows educed molecula weigh , enhanced pas e s abili y, and imp o ed ilm- o ming cha ac e is ics.
I also has a lowe iscosi y [42].
Enzyma ic Modi ica ion
Enzyma ic modi ica ion o s a ch p ima ily aims o educe molecula weigh and deb anch amylopec in, he eby enhancing
he p oduc ion o esis an s a ch. Common enzymes in ol ed in his p ocess include α-amylase (AM), β-amylase,
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glucoamylase, deb anching enzymes, cyclodex in glycosyl ans e ase, and glucose isome ase [43]. S a ch enzyma ic
hyd olysis can be ca ied ou h ough a ious pa hways.
This g een modi ica ion echnique has di e se applica ions in he ood indus y. Besides imp o ing esis an s a ch, u ilizing
hese enzymes o c ea e iscous and s able s a ch solu ions o ex ile sizing applica ions, cla i ying ui juices and bee by
emo ing haze, p e ea ing animal eed o inc ease diges ibili y, and acili a ing s a ch saccha i ica ion o lique ac ion [44].
Po ous s a ch can be p oduced using ungal enzymes such as amyloglucosidase (AMG) o α-amylase (AM). Pullulanase plays
a key ole in s a ch saccha i ica ion and is widely u ilized in manu ac u ing high-glucose and high-mal ose sy ups.
Figu e 6 Enzyma ic Modi ica ion o S a ch [44]
Deb anching Enzymes
Examples o deb anching enzymes include isoamylase and ype I pullulanase, bo h capable o hyd olyzing α-(1,6)
glycosidic bonds. These enzymes b eak down amylopec in in o linea glucans. Pullulanase speci ically a ge s he α-
(1,6) glucosidic linkages p esen in s a ch, amylopec in, pullulan, and ela ed oligosaccha ides, e icien ly con e ing
b anched polysaccha ides in o e men able suga s du ing saccha i ica ion. Isoamylase, in con as , hyd olyzes only he
α-(1,6) bonds wi hin amylopec in [43].
Endo- and Exo-Amylases
α-Amylase (1,4-α-D-glucan glucanohyd olase) is an endo-amylase ha clea es in e nal α-(1,4) glycosidic bonds
wi hin s a ch chains, leading o a apid educ ion in molecula size. The po e size o med on s a ch g anule su aces
depends on bo h he ype and concen a ion o α-amylase used [46]. Exo-amylases include enzymes such as
glucoamylase (also known as amyloglucosidase, AMG) and β-amylase (1,4-α-D-glucan mal ohyd olase), which con e
mal ose om he α- o he β-anome ic con igu a ion. These enzymes ei he selec i ely clea e α-(1,4) glycosidic bonds,
as β-amylase does, o clea e bo h α-(1,4) and α-(1,6) bonds om he non educing ends o s a ch chains, as seen wi h
AMG and α-glucosidase. Ac ing on he ou e glucose esidues o amylose o amylopec in, glucoamylase and α-
glucosidase elease glucose, while β-amylase p oduces mal ose and β-limi dex in [43].
T ans e ases
Func ion by hyd olyzing he α-(1,4) glycosidic bond o a dono molecule and ans e ing he eleased esidue o a
glycosidic accep o , he eby o ming a new glycosidic bond. Enzymes such as cyclodex in glycosyl ans e ase and
amylomal ase ca alyze he o ma ion o hese new α-(1,4) linkages.
3.3. Physical Modi ica ion
Physical modi ica ion e e s o he p ocesses applied o s a ch ha do no unde go a chemical eac ion o cause he
s a ch polyme ’s D-glucopy anosyl building blocks o b eak down. These me hods include he mal, mechanical o ce,
o physical ields. The h ee main ypes o physical modi ica ion o s a ch a e ea men s in ol ing hyd o he mal
Wo ld Jou nal o Ad anced Resea ch and Re iews, 2025, 27(02), 818-831
825
p ocesses, physical ield applica ions, and a ious o he physical app oaches. Depending on he deg ee o modi ica ion,
s a ch unc ionali y equen ly changes di e en ly ollowing physical al e a ion [45].
Physical modi ica ions a e known o be g een and e icien . I has been used widely o p epa e a ious oods such as
noodles, u u, biscui s, mea pies, snacks, and en i onmen ally iendly edible ilms. Ul a-high p essu e (UHP)
ea men lowe s he iscosi y and s a ch swelling, while ul asound a ec s how g anules and pas es swell. Mic owa e
modi ica ion al e s he mo phology and c ys allini y o he s a ch [46]. S a ch g anules can also be physically al e ed
h ough ex usion and milling.
Table 1 Physical Modi ica ion o S a ch
Hyd o he mal T ea men
Physical Field T ea men
O he Physical T ea men s
Annealing T ea men (ANN)
Mic owa e
Cold Plasma
I adia ion
D um D ying
Hea Mois u e T ea men (HMT)
Pulse Elec ic Field (PEF)
Ex usion
Ul a-High P essu e (UHP)
F eezing-Thawing
Ul asonic
Milling
3.4. Impac s o modi ica ion on physicochemical p ope ies o polyme s
E ec s o a ious modi ica ion me hods on he physicochemical p ope ies o s a ch a e summa ized in Table 2. This
able ou lines how di e en chemical modi ica ions o s a ch, such as ca boxyme hyla ion, ace yla ion, succinyla ion
(OSA), oxida ion, and c oss-linking, a ec key physicochemical p ope ies like c ys allini y, gela iniza ion, swelling,
pas e cla i y, and he mal s abili y. These al e a ions a ec he s a ch's he mal beha io , mo phology, hyd a ion, and
s abili y, all o which in luence hei u ili y in d illing ope a ions.
Table 2 E ec o S a ch Modi ica ions on Physicochemical P ope ies
Modi ica
ion
C ys allini
y
Mo pholo
gy
Gela iniza ion
(To, Tp, Tc,
ΔH)
Swellin
g &
Solubili
y
Pas e
Cla i y
The mal /
P ocessin
g S abili y
Re og ada
ion /
S o age
S abili y
Re e
ence
s
Ca boxy
me hyla i
on
Dec eases
c ys allini y
due o
dis up ion
o H-bonds
Rough
su ace,
pa ial
de o ma i
on
Dec eases
To/Tp, ΔH due
o inc eased
hyd a ion and
chain mobili y
inc ease
s
swelling
and
solubili
y due o
hyd oph
ilic
g oups
Inc ease
s cla i y,
anspa
en ilms
Inc eases
mic obial
and
he mal
s abili y
Enhances
educed
e og ada i
on due o
s e ic
hind ance
[17,2
3]
Ace yla i
on
Reduces
c ys allini y
due o
subs i u ion
on hyd oxyl
g oups
Sligh
ougheni
ng,
g anules
e ained
Reduces
gela iniza ion
emp and ΔH;
less ene gy
needed o
swelling
Inc ease
s
swelling
and
solubili
y
Enhance
s mo e
anspa
en
pas es
Imp o e
eeze-
haw
s abili y
and
iscosi y
con ol
Reduced
syne esis,
delayed
e og ada i
on
[47,4
8]
Succinyla
ion
(OSA)
Reduced
due o
epulsion
and
molecula
Smoo h o
sligh ly
po ous
su aces
imp o es
gela iniza ion
emp, sligh ΔH
changes
imp o e
s
swelling,
wa e -
holding,
and
imp o e
s cla i y
Inc eases
cold-
s o age
and
eeze–
Enhances
s o age
s abili y,
lowe s
e og ada i
on
[49,5
0]
Wo ld Jou nal o Ad anced Resea ch and Re iews, 2025, 27(02), 818-831
826
ea angem
en
emulsi y
ing
abili y
haw
s abili y
Oxida ion
Dec eased
due o
depolyme i
za ion o
amylose/a
mylopec in
Pi ed,
po ous
g anules
Can go ei he
way, To/Tp,
depending on
s a ch sou ce;
ΔH may
inc ease
Inc ease
s
solubili
y; be e
cold
solubili
y
Imp o e
d
cla i y
Enhances
lexibili y
and ensile
s eng h in
ilms
Imp o ed
e og ada i
on esis ance
[51]
C oss-
linking
inc ease o
unchanged
(p ese ed
c ys allini y
)
Compac ,
oughene
d
g anules
Enhances
To/Tp/Tc,
lowe ΔH; mo e
he mally s able
g anules
Reduces
swelling
and
solubili
y
( es ic
ed
expansio
n)
Reduced
cla i y
due o
opaci y
inc eases
he mal,
acid, and
shea
esis ance
Reduce o
mixed,
depending
on c osslink
ype
[52]
Ca boxyme hyla ion:
Ca boxyme hyla ed s a ch (CMS) in oduces hyd ophilic ca boxyme hyl g oups, dis up ing in e nal hyd ogen bonding,
dec easing c ys allini y, and inc easing swelling and solubili y [17]. This enhances mic obial esis ance and imp o es pas e
cla i y. Howe e , CMS has limi ed he mal esis ance, especially unde HPHT condi ions, making i sui able only when
combined wi h c oss-linking agen s [17].
Ace yla ion:
Ace yla ion subs i u es hyd oxyl g oups wi h ace yl g oups, educing gela iniza ion empe a u e and ene gy equi emen
[47]. I p oduces a mode a ely ough mo phology while main aining g anule in eg i y. Ace yla ed s a ches o m
anspa en pas es and exhibi imp o ed eeze- haw and s o age s abili y, making hem sui able o saline and mode a ely
ho condi ions [48].
Succinyla ion (OSA):
Succinyla ed s a ches o e enhanced emulsi ying capaci y and cold s age s abili y due o inc eased molecula epulsion
and s uc u al ea angemen s [49]. Thei swelling capaci y and cla i y a e supe io , making hem sui able o dual-
unc ion addi i es in d illing luids equi ing il a ion con ol and emulsi ica ion.
Oxida ion:
Oxidized s a ches possess a lowe molecula weigh due o pa ial depolyme iza ion, enhancing solubili y and cla i y. Thei
e ec i eness in ilm applica ions is well-documen ed [51], bu da a ega ding hei d illing- luid beha io is limi ed. Fu he
explo a ion is necessa y o alida e hei use unde dynamic wellbo e condi ions.
C oss-linking:
C oss-linked s a ches main ain o inc ease c ys allini y, ein o cing g anule s uc u e and boos ing esis ance o he mal,
mechanical, and chemical s ess. This modi ica ion aises gela iniza ion empe a u es while educing swelling and
solubili y, which helps main ain iscosi y in HPHT en i onmen s [52].
4. Applica ions o modi ied polyme s as d illing luid addi i es
Modi ying polyme s is a common app oach o enhance hei unc ional p ope ies, and s a ch modi ica ion has a ac ed
signi ican a en ion o imp o e i s pe o mance ac oss a ious indus ies, including d illing luids. This s udy examines
he physicochemical cha ac e is ics and d illing luid beha io o i e chemically modi ied s a ches:
ca boxyme hyla ion, ace yla ion, succinyla ion (OSA), oxida ion, and c oss-linking. By e iewing exis ing li e a u e and
compa ing da a, i explo es how each modi ica ion impac s c i ical p ope ies such as c ys allini y, swelling,
