Available online at http://ijcpe.uobaghdad.edu.iq and www.iasj.net Iraqi Journal of Chemical and Petroleum Engineering Vol.20 No.3 (September 2019) 39 – 47 EISSN: 2618-0707, PISSN: 1997-4884 Corresponding Authors: Name: Saifalden Y. Alssafar, Email: saifpet@yahoo.com, Name: Faleh H. M. Al-Mahdawi, Email: fhmetr@yahoo.com IJCPE is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. Certain Assessment of Using MWCNT Nps in Drilling Fluid to Mitigate Stick-Slip Problem during Drilling Operation System Saifalden Y. Alssafar and Faleh H. M. Al-Mahdawi Petroleum Engineering Department, University of Baghdad Abstract Stick- slip is the continuous stopping& release of the Bit/BHA due to the irregular down-hole rotation prompted by the existing relationship between the friction torque and the torque applied from the surface to free the bit. Friction coefficient between BHA and wellbore is the main player of stick slip amount, which can be mitigated by support a good lubricators as additives in drilling mud. Mathematical (or empirical) solves should be done through adjusting all parameters which supposed to reduce stick- slip as low as possible using different models, one of the main parameters is drilling mud. As per Nanoparticles drilling fluid is a new technology that offers high performance it’s necessary to find out the relationship between the use of Nano fluid and the minimum stick- slip vibration. In this study (multiwall carbon Nano tube) will be used as a Nanoparticles in Fresh water bentonite mud and polymer mud by five tests per each one to find out the coefficient of friction and used it in a special torque and drag software as a part of drilling vertical well simulation to calculate expected bottom hole torque within five different Nano concentration per each mud type. In fresh water bentonite mud torque reduction was from 4000 ft-lb to 3500 ft-lb, while in polymer mud torque failed and didn’t reduce, so it raised from 2050.88 ft-lb to be around 2200 ft-lb. Keywords: stick – slip problem, drilling mud, Nano particles fluids, MWCNT, drill string, BHA vibrations Received on 13/01/2019, Accepted on 19/04/2019, published on 30/09/1029 https://doi.org/10.31699/IJCPE.2019.3.6 1- Introduction Big amount of vibration during drilling formation frequently occurs, where in one drilling run all three main vibrations may occur together (torsional vibration, axial vibration and lateral vibration). Solutions in both of technologies and methodologies paths can be together a useful key in order to reduce down hole vibration. Unacceptable levels of vibration can cause drill string fatigue, poor directional tendencies, premature bit failure, stalling of the top drive or rotary table, hole enlargement, MWD tool failure and Bit /Stabilizer / tool joint wear, stick-slip vibration represent the torsional type and it the biggest trouble maker between the three down hole vibrations. ‎[1], ‎[2], ‎[3] Nowadays, directional drilling models are the most preferred for many reasons, therefore there are needs of using complex bottom hole assembly design (BHA), where this BHA will be longer than the normal one and includes very thin clearance in some parts, so this drilling operation will create high torque and vibrations, hence such like these operation should comply with make vibration monitoring and controlling a key in drilling optimization. A number of operator companies have become aware of the importance of controlling vibration and have created programs to raise awareness and generate control strategies.‎[4], ‎[5] 2- Aim of this study In this Study we work to find out direct drilling mud effects on torsional vibration(stick-slip) during drilling by finding relationship between the problem of stick slip during drilling and the adding of Nanoparticle materials (using multiwall carbon Nanotubes (MWCNTs)] to the drilling fluid within different concentrations. 3- Methodology Carbon Nano tube (CNT) is one of the allotropic forms of carbon with cylindrical shape structure. It is consist of carbon atoms which are connected in hexagonal shapes. ‎[6], ‎[7], ‎[8]. The main character of CNT that is the Length of CNT can be up to 132,000,000 times greater as compared to its diameter which is very high and attractive as compared to other materials. In additional to cylindrical structure, important properties of CNT are exceptionally improved such as unique electrical characteristics, mechanical strength and thermal conductivity ‎[2]. CNT is one of the strongest materials in terms of tensile strength and elastic modulus ‎[9]. https://doi.org/10.31699/IJCPE.2019.3.6 S. Y. Alssafar and F.H. M. Al-Mahdawi / Iraqi Journal of Chemical and Petroleum Engineering 20,3 (2019) 39 - 47 04 Fig. 1. Multiwall carbon Nanotube MWCNT ‎[10] Fig. 2. Single wall carbon Nanotube swcnt ‎[10] 3.1. Diagnostic Test a. The Lubricity tester Lubricity tester is often used to assess and guess the influence made by a drilling mud additive with regards to friction force. The most common tester, the Fan or OFITE Model 212, is normally used in a laboratory setting (as shown in Fig. 3). This Extreme Pressure (EP) and Lubricity Tester is intended to simulate contact between a drill string and casing, it consists of a rotating ring and stationary block, which are submerged in the drilling fluid. Since particular load under wellbore conditions is hard to determine, classically fixed levels of contact forces are used. We can measure by this device lubricity factor or coefficient of friction (CoF), Mud torque reading and Mud cake friction (KF). Fig. 3. Ofite Lubricity Tester ‎[11] There are some features make this model device is still up to date of measuring friction factor, the following features conclude them:  The accuracy of reading data by Digital Control.  The motor automatically maintains torque as a constant speed when force is applied to the ring and block. So no need to manual speed adjustments.  Simple use instruction, makes testing quick and easy, i.e. manual speed control, pre-set speeds (60, 200, 600, and 1000 RPM) and torque zeroing.  Has the ability of recording torque reading and temperature with respect to time in simple and clear monitor. ‎[11] 3.2. Ultrasonic Actions An ultrasonic treatment is the most common solution to disperse the nanoscale particles in liquid media. It used with/ without chemical dissolving agents. In typical dispersion operations, sonication required about (12-36) hrs. to ensure influence dispersion with appropriate solvent. a. Sonication Organization There are three major stages that Ultrasonic system working on it: Generator to transfer AC power energy (high voltage), Converter works as modifier of that energy into vibration and probe (Horn) enlarges and contracts longitudinal status. By changing the amplitude setting we can get a various cavitation fields. During sonic operation the solution could get high temperatures, so it may need close observation ‎[12], [13]. b. Ultra-Sonic Device (Elma E series) ‎[14]  Sweep (cleaning): Safely clean metal, glass, electronic, and plastic parts  Degas(bubble remover): Rapidly remove gasses from liquids  Normal(dispersion): Dissolve, homogenize, disperse, mix and emulsify lab samples S. Y. Alssafar and F.H. M. Al-Mahdawi / Iraqi Journal of Chemical and Petroleum Engineering 20,3 (2019) 39 - 47 04 Fig. 4. Elma ultrasonic device E series The Elmasonic E series consists of 8 diverse unit dimensions with tank volumes alternating from 1.75 up to 28 litre. They are formed with efficient 37 kHz ultrasonic power transducers of the latest generation. It is easy to work in lab condition and safe to be left alon to automatic switch- off after 12 hours for more safety. 3.3. (Stick-Slip) Software Assumption Using some parameters of the real rig and by input the variable values of friction factors that got from the experimental work for 10 samples, this software will calculate a new torque values (ft-lb) per each sample result. In this research Rig IDC-56 is used to simulate drilling a vertical well, 12 1/4” section hole, WOB=(25 - 30 Klb. for polymer mud, and WOB =12 - 14 Klb. for FWB mud where it commonly used on shallow depth), RPM= 45 with fixed friction factor of 0.25 ft-lb between drilling string and 13 3/8” casing. The drilling Bit& BHA designed as follow: Table 1. BHA design in software Item Description (OD) ID (Weight) Length Cum. Length # a (in) (in) (lbpf) (m) (m) 1 PDC a 8.000 3.500 138.52 0.44 0.44 2 Near-Bit Stabilizer with FV a 8.000 3.000 147.22 2.31 2.75 3 MWD Directional + Gamma a 8.000 4.000 128.48 9.90 12.65 4 1 x 8" Drill Collar a 8.000 2.750 150.70 9.14 21.79 9 1 x 8" Drill Collar a 8.000 2.750 150.70 9.14 87.45 10 X-Over Sub a 8.000 2.875 149.18 0.78 88.23 11 2 x 6 3/4" Drill Collar a 6.750 2.750 101.50 18.28 106.51 12 [15 x 5"]Heavy wall drill pipe(HWDP) 5.000 3.000 49.30 140.70 247.21 13 5" DP a 5.000 4.276 21.92 9.00 256.21 4- Experimental Work This workshop is prepared to develop the rheological characterize of drilling fluid. The increase of some rheological parameters above the desired limit can cause some issues such as stuck pipe, lost circulation etc. For example, the preferred drilling fluid has minimum plastic viscosity, and gel strength with a flat curve in order to reduce the required pump pressure to start circulation again. To reach these aims of the study, ten experiments tests were directed in bottom hole conditions, where hot roll was used in order to heat and rotate the mud samples for four hours in around 250 degree Fahrenheit, Viscometer Model 800 was used to measure mud rheology, Benchtop meter to get PH, Filter press device to determine the water loss Multi-mixer Model 9B Fan to ensure mix mud in high efficient and quick minor, sonication system with solvent to disperse Nanoparticle in mud and Mud Lubricity Tester to catch the friction factor for each test sample. 4.1. Sample preparation To insure good Nano-MWCNT Dispersion the following Procedure was conducted: a. Mixing MWCNT powder in Distilled water and put it into Ultrasonic Bath. b. Mixing Surfactant in water type Distilled to raise the efficiency of nanoparticles dispersion and put it into Ultrasonic Bath too. c. Merge the two solutions were prepared in above and put them again in the Ultrasonic Bath for 7-8 hours. d. Five samples (cups) were made, as per the first sample was blank then adding 0.35, 0.7, 1.05, 1.75 gm of MWCNT consequently to FWB and adding 0.1, 0.2, 0.3, 0.5 gm to polymer mud. e. Nano-colloidal solution added to fluid system in Different concentrations as follow: 1- 280.5 CC of polymer mud. 2- 350 CC of FWB. S. Y. Alssafar and F.H. M. Al-Mahdawi / Iraqi Journal of Chemical and Petroleum Engineering 20,3 (2019) 39 - 47 04 4.2. Mixing Mud a. Preparing polymer mud Preparing was made based on Table 2, the materials were mixed by multi mixer Fann (9B) Table 2. polymer mud composition Composition Unit Blank Mixing Time Distilled Water CC 280.5 - Sodium Chloride gm 61.35 10 min Potassium Chloride gm 11.66 12 min Caustic Soda gm 1.05 12 min Soda Ash gm 1.55 12 min Starch gm 12.5 12 min PAC LV gm 1.04 12 min Xanthan gm 0.55 12 min Limestone (50-75 μ) gm 87.65 12 min 1- Using five individual samples of blank polymer mud Nano material were added in different concentration and mixed for 20 min. 2- By using Rotational Viscometer Model OFITE 800, viscosity Measured by at 120 ο F 3- Put arranged mud in hotroll for assessing rheological properties in downhole circumstance at 250 ο F amid 4 hrs. 4- Calculate the viscosity and gel strength at 120 ο F by rotational viscometer type (OFITE 800) 5- Measure mud filtrate volume through API Filter Press type (Fan 300series) at laboratory temperature and pressure of 100 psi. 6- Appraise lubricity factor by using (EP/ Lubricity) tester b. Prepare Bentonite Mud Table 3. FWB mud composition Composition Unit Blank Sample Mixing Time Distilled Water CC 350.0 - Bentonite gm 22.50 25 min The mud prepared based on Table 3 as follow: 1- Aging arranged mud in lab. Temperature within 16 hrs. to ensure 2- Nano material added to mud sample cups in certain concentrations and mixed at 20 min. 3- Viscosity & gel strength measured at 120 ο F using rotational viscometer Model (OFITE 800). 4- Measure filtrate volume by API Filter Press model Fan 300series at room temperature and 100 psi pressure work. 5- Determine lubricity factor (CoF) by the use (EP/ Lubricity) tester. c. Preparation of Nano Material The following steps are concluding Preparing of MWCNT Nano Material for all tests: 5- Results and Discussion 5.1. Polymer Mud Test with MWCNT Additives Table 4 is demonstrations the changes in Mud Rheology when we added MWCNT to 280.5 cc of polymer Mud by various concentrations respectively. Table 4. Polymer mud rheology with mwcnt additives in two conditions Rheology (120 °F) Cup 1 Cup 2 Cup 3 Cup 4 Cup 5 BHR AHR BHR AHR BHR AHR BHR AHR BHR BHR AV 25 21.5 31.5 20.5 30 23.5 35.5 26.5 45 32.5 RPM 600 50 43 63 41 60 47 71 53 90 65 RPM 300 30 26 42 28 39 31 47 33 59 40 PV CP 20 17 21 13 21 16 24 20 39 25 YP lb/100 ft 2 10 9 21 15 18 15 23 13 20 15 RPM 200 22 19 32 21 30 23 32 25 46 30 RPM 100 14 12.5 22 13 21 14 24 15 30 19 RPM 6 3 3.5 5 3 5 3 5 4 7 4 RPM 3 2 2.5 4 2.5 4 2.5 4 2.5 6 3.5 GEL 10 s 3 3 6 2.5 4 3 5 3 7 4 GEL 10 min 4 4 8 4 7 5 7 5 9 5 pH 12.46 12.21 12.80 10.34 12.73 10.52 12.79 10.41 12.77 10.61 API FL, cc - 2.2 - 3.8 - 3.5 - 3.2 - 3 Settlement No yes No No No No No No No No Filter cake - 1/32 - 1/32 - 1/32 - 1/32 - 1/32 Foam No No No No No No No No No No Water Torque Reading - 33.7 - 36.0 - 36.1 - 33.9 - 36.2 Mud Torque Reading - 20.1 - 22.8 - 22.8 - 23 - 23.5 Lubricity Factor - 0.2028 - 0.2153 - 0.215 4 - 0.2306 - 0.230 7 Torque Reduction - - - - - - - - - - Mud Cake Friction (KF) - 0.2046 - 0.1302 8 - 0.1302 8 - 0.1357 8 - 0.1396 0 S. Y. Alssafar and F.H. M. Al-Mahdawi / Iraqi Journal of Chemical and Petroleum Engineering 20,3 (2019) 39 - 47 04 Table 5. Polymer mud rheology with MWCNT additives Rheology (120 °F) Blank 0.1 gm 0.2 gm 0.3 gm 0.4 gm AV 21.5 20.5 23. 5 26.5 32.5 RPM 600 43 41 47 53 65 RPM 300 26 28 31 33 40 PV 17 13 16 20 25 YP 9 15 15 13 15 RPM 200 19 21 23 25 30 RPM 100 12.5 13 14 15 19 RPM 6 3.5 3 3 4 4 RPM 3 2.5 2.5 2.5 2.5 3.5 GEL 10 s 3 2.5 3 3 4 GEL 10 min 4 4 5 5 5 pH 12.21 10.34 10.5 2 10.4 1 10.61 API FL, cc 2.2 3.8 3.5 3.2 3 Settlement yes No No No No Filter cake 1/32 1/32 1/3 2 1/32 1/32 Foam No No No No No Water Torque Reading 33.7 36.0 36. 1 33.9 36.2 Mud Torque Reading 20.1 22.8 22. 8 23 23.5 Lubricity Factor 0.202 8 0.2153 0.21 54 0.230 6 0.230 7 Torque Reduction - - - - - Mud Cake Friction (KF) 0.204 6 0.13028 0.130 28 0.135 78 0.1396 0 Fig. 5. plymer mud parametes with MWCNT (Lubricity Factor & Mudcake Friction*10) In the graph 5 noticed that no big change in CoF with increasing Nano grams gradually per each test, with a little increase of CoF to improve that MWCNT doesn’t enhance friction resistance when we add it to polymer mud and we have to try another Nanomaterial. It’s also clear that MWCNT makes the problem of mud filtrate is bigger which leads to some other issues like formation damage or wall problems. We can find that MWCNT is optimized lifting cutting and hole cleaning by increasing YP and 10 min gel, so this type of Nano material is valuable in fast drilling purpose especially in vertical wells, however we should avoid adding NWCNT to Polymer mud if stick- slip is the major expected problem. It’s also clear that MWCNT makes mud filtrate somewhat bigger than blank test which could leads to some other issues like formation contamination or wall problems. We can find that MWCNT is optimized lifting cutting and hole cleaning by increasing YP and 10 min gel, so this type of Nano material is valuable in fast drilling purpose especially in vertical wells; however we may avoid adding MWCNT to Polymer mud if stick- slip is not the major expected problem. Table 6. CoF & Torque and drag software reading with MWCNT Rheology -------- gm 0.1 gm 0.2 gm 0.3 gm 0.4 gm Lubricity Factor 0.2028 0.2153 0.2154 0.2306 0.2307 Torque reading 2050.88 2201.79 2201.79 2303.02 2303.02 Fig. 6. Torque reading (polymer mud + MWCNT Fig. 6 show that there is a little increase in Torque reading occurs in the test sample since MWCNT was added and it proportionally sensed to that Nanomaterial. Fig. 7. (Polymer mud + MWCNT) torque reading with trend line As shown in Fig. 7, the relationship between Torque reading and MWCNT additives in polymer has acceptable trend line with (R 2 =0.8579) within linear equation Y= 605.51X +2091 as shown in Fig. 7 That means using MWCNT as Nano material is purely a proportional relationship toward torque increasing, so to reduce downhole friction is unsuccessful in case we used mud type “polymer”. S. Y. Alssafar and F.H. M. Al-Mahdawi / Iraqi Journal of Chemical and Petroleum Engineering 20,3 (2019) 39 - 47 00 Polymer mud has lower CoF than FWB mud in wide range then polymer would certainly reduce friction positively, however in drilling high angle wells or horizontal well there is extra requirement of reducing torque as much as possible therefore we have to keep looking for another Nanomaterial to cover drilling requirements. a. Fresh Water Bentonite Mud Test with MWCNT Additives In this job’s package, FWB mud was used with 350 ml. and adding MWCNT as (0.35, 0.70, 1.05, 1.75) gm. MWCNT per each test’s cup respectively, in ratio configuration: (o%, 0.1%, 0.2%, 0.3%, 0.5%) % wt. The mud parameters recorded in table (7) for each amount of MWCNT individually in. Table 7. Fwb mud rheology with mwcnt additives Rheology (120 °F) ------- 0.35 0.70 1.05 1.75 AV 18.5 26. 5 30 36.5 43. 5 RPM 600 37 53 60 73 8 7 RPM 300 34 49 56 69 8 5 PV 3 4 4 4 2 YP 31 45 52 65 8 3 RPM 200 32 47 54 63 8 4 RPM 100 31 43 51 62 8 1 RPM 6 24 38 46 57 7 7 RPM 3 24 37 45 54 7 6 GEL 10 s 24 38 45 57 7 2 GEL 10 min 25 43 48 63 7 6 pH 9.18 9.2 4 9.19 9.38 9.4 1 API FL, cc 14.2 10. 5 8.2 7.8 6. 8 Settlement No No No No N o Filter cake 5/32 ” 4/3 2” 4/32” 3/32 ” 3/3 2” Foam No No No No N o Water Torque Reading 35.5 32. 0 35.8 36.0 35. 4 Mud Torque Reading 45.9 40. 1 43.8 39.8 36. 0 Lubricity Factor 0.424 2 0.42 60 0.415 9 0.375 8 0.34 47 Torque Reduction - 12. 6 4.57 13.2 9 21. 36 Mud Lubricity Cake (Kf) 0.69 0.06 9 0.073 0.06 9 0.0 61 Fig. 8. FWB + MWCNT rheology with MWCNT (CoF & KF *10) Table 8. CoF & Torque and drag software reading with MWCNT +FWB Rheology -------- gm 0.35 gm 0.7 gm 1.05 gm 1.75 gm Lubricity Factor 0.4242 0.4260 0.4159 0.3758 0.3447 Torque reading 4068.67 4068.67 4018.17 3764.55 3400 Fig. 9. (FWB + MWCNT) torque reading with trend line By Fig. 9 MWCNT concentration of 1.75 gm is the lowest torque reading but it combined with too much high (YP=83), where the growth of yield point is come from high surface areas to the volume unite this will surge the interaction of the nanoparticles with the medium of the base fluid. YP is sensitive to MWCNT more than other Nano materials due to tubular structure of MWCNT, therefor the 0.105 gm has (YP=65) where it is acceptable. Also in same concentration (1.75 gm) found high gel strength comes from the high intensity of electrostatic force between nanoparticles which leads to the linkage between nanoparticles and base fluids to arrange like a rigid structure. We can also see that in low Nano concentration there is no change in Torque until 0.6 gm, then there is dramatically drop in Torque 0.6 -1 gm to be slightly lower dropping after1 gm, so adding MWCNT more than 1.05 gm to the test sample is cost effective with relatively a little torque reduction so high amount of Nanoparticles economically failed to gain our goals. In this test good results of less filtration, where the amount of filtrate was decreases a touch with increasing the concentration on nanoparticles of MWCNT. Figure 9 shows also that the best linear equation is: Y = -406.46X + 4177 (1) This equation ensures that MWCNT fraction reading have inversely relationship with torque, however this mixture does not match the optimum required for other mud rheology. S. Y. Alssafar and F.H. M. Al-Mahdawi / Iraqi Journal of Chemical and Petroleum Engineering 20,3 (2019) 39 - 47 04 6- Conclusion and Recommendation The following conclusions are captured from the research results:  No big changes in CoF when we added MWCNT to polymer but there was CoF increasing from 0.2 to be 0.23 (which is bad indication) but without any side effect to other mud rheology.  At high MWCNT Ratio in mud type FWB we got very low FF but we lost other important mud rheology like (YP= 74, Gel 0 sec= 61).  Using MWCNT with polymer mud gives negative effect on torque reduction, however MWCNT is enhanced lifting cutting and hole cleaning.  High MWCNT Ratio in mud type FWB gives very low CoF but lost other important mud rheology like (YP= 74, Gel 0 sec= 61).  The best MWCNT ratio to be really used in drilling field was 0.3% (1.05 gm in the test)[ torque drop is (4068 – 3764) ft-lb ] because if we add more a high shear rate and shear stress is required, thus more drilling risk expected.  In general, Nano materials is very important enhances in mud rheology, therefor the petroleum Iraqi company need to ask all drilling contractors to use these technology to drill our wells with high performance and less problems. And some points are recommended for future research:  Using MWCNT with polymer mud is not recommended with respect to torque reduction, however MWCNT is enhanced lifting cutting and hole cleaning where YP & Gel10 min. are increased proportionally, thus this brand of Nano material is valued in fast drilling purpose particularly in vertical wells.  Economically and for shallow depth using FWB with this Nano material is recommended.  Re-assess the stability of the same Nanomaterials that we used, in HPHT circumstance, with taking in consideration keeping appropriate mud rheology.  Start using Nanoparticle in the mud of oil fields to inspect the outcomes of stick-slip performance in wellbore conditions, in conventional well plan to clearly find out the torque reduction, when we compare that with offset well data. Although MWCNT is still expensive, we used very low ratio, whereas average of 2.5 Kg of MWCNT is required to mix one cubic meter of mud, that’s mean Nano is cheaper and safer even from using gas oil to increase lubrication, in additional of small amount is easy to handle and cheap transportation. Acknowledgement I am grateful to all of those with whom I have had the pleasure to work during this and other related projects, starting from my parents, my wife, my children, my supervisor and PDF Company staff, those people help me and guide me to get ideas, solution methods, resources and analyses aids. I appreciate all my friends and well- wishers. For their words of motivation and words of comfort that come in just in time. God bless you all. Nomenclatures and Abbreviations MWCNT: multiwall carbon Nanotube AV: Apparent Viscosity cp. 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Al-Mahdawi / Iraqi Journal of Chemical and Petroleum Engineering 20,3 (2019) 39 - 47 04 الى سائل الحفر لغرض التخفيف من مشكمة MWCNTتقييم خاص لتقنية اضافة االلتصاق واالنزالق التي تحدث اثناء عممية الحفر سيف الدين الصفار و فالح المهداوي قسم هندسة النفط, جامعة بغداد الخالصة توقف ثم انزالق متعاقبين يحدثان بشكل ترددي في منظومة قاع البئر ظاهرة االلتصاق واالنزالق تعرف بانها اثناء عمميةالحفر نتيجة لمتباين في قيمتي جهد االحتكاك الحاصل اثناء حفر القطع الصخرية وين الجهد المسمط في المنضدةالدوارة اورأس التدوير. العامل الرئيسي لتقميل او منع حدوث هذه تقميل معامل االحتكاك بين منظومة قعر لبئر وجدار البئر يمثل الظاهرة والتي تتم عمميا عن طريق توفير اضافات لسائل الحفر تزيد من انزالقية الطين. كال التقنيات النظرية والتطبيقية تعمل سوية لتقميل تمك االهتزازات وذلك الن تخطي الحد المسموح من , احد اهم مفاتيح الحمول هو تطوير طين الحفر وكما هومعموم االهتزازات سيؤدي الى العديد من مشكال الحفر فان استخدام المواد النانوية في اطيان الحفر تعد من التقنيات الحديثة حيث نجحت في تقديم نتائج مختبرية ( FWB & polymerفي نوعين من الطين ) MWCNTالطيان ذات مواصفات عالية لذا تم استخدام مادة ومن ثم تحميل النتائج مختبريًا بعدها ادخمنا نتائجمعامل االحتكاك لكل عينة في برنامج ذكي بتراكيز مختمفة يعمل تمثيل لحفر بئر عمودي ليحتسب مقدار االحتكاك المتوقع في قاع البئر. مع طين 0044ft-lbالى ft-lb 0444قي تقميل مقدار االحتكاك من MWCNTنجحت المادة النانوية ft-lb( 0044 – 0404, بينما سببت ارتفاع طفيف في االحتكاك ) Fresh Water Bentoniteالحفر نوع في حالة الطين من نوع البوليمر. , سمسمة الحفريئات النانوية, سائل الجز الدالة: مشكمة النزالق, طين الحفرالكممات