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Volume 2 - Issue 3 (November-December 2019)

Title Effect of Cashew Nut Shell Liquid Esters on KCL/Polymer/Glycol Drilling Fluid Flow Property
Author Dike, H. N. || Dosunmu, A. || Akaranta, O. || Kinigoma, B.
Source International Journal of Technical & Scientific Research Engineering pp 01 - 11,  Vol. 02. Issue. 03. November-December 2019
Abstract
Drilling to target depth at minimal cost with less environmental impact mud systems have been the major issues during drilling operation. Especially with the advent of novel technologies and techniques such as deviated well, high-pressure-high-temperature (HPHT) and extended reach wells. The uses of more complex additives in formulating mud systems for such operations have shown successes but have inherent environmental issues. They are often petroleum based sources, thus, are toxic, non-biodegradable and costly. Within the formation, flow and property of the mud is affected by changing temperatures thereby weakening their active ingredients and distorting their ability to perform effectively. Most of these additives are phenolic compound with low carbon chain structure and molecular weight hence they degrade at slight changes in temperatures. This study investigates the effects of composition of novel additives (esters) synthesized from Cashew nut shell liquid (CNSL) on the flow properties of drilling fluid. The results obtained shows that the esters were compatible with other mud additives utilized in the formulation. The plastic viscosity values obtained for all samples ranges from 14-17cp with sample E having the highest value with reference to based mud. All the samples had PV values within API range (8-35cp). Yield point for samples were between 15 and 24 (Ib/100ft2), sample F was highest with 24(Ib/100ft2) while D and G values 16 and 15 (Ib/100ft2) respectively were lower compared to the standard mud value. The gel strength values for all mud samples were between 3and 4(Ib/100ft2) for10sec and 10minrespectively except sample D with 1Ib/100ft210 seconds gel. However, YP and Gel values for all samples were within API acceptable range ((YP=5 and ≤ 3(PV); Gel: 10sec (2-5) and 10 min (2-35))except sample D with lower10 seconds gel value. The results proved that the formulation can actually sustain the cuttings with minimal pump pressure required to further initiate flow after circulation is stopped. It is therefore proposed that the esters could serve as potential multi-purpose additives in water based mud formulations. This will help to reduce the cost and environmental toxic impacts of using synthetic oilfield additives.
Keywords CNSL, Natural Esters, Drilling Fluid, Additives, Properties
 

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Title New record of a wood-boring isopod damaged Sonneratia albaJ. Sm. in Thi Nai lagoon, Binh Dinh province, Vietnam
Author Van Hanh Trinh || Quoc Huy Nguyen || Van Tuat Le || Thi Loi Tran || Ngoc Bich Dang
Source International Journal of Technical & Scientific Research Engineering pp 12 - 18,  Vol. 02. Issue. 03. November-December 2019
Abstract
Thi Nai is the biggest lagoon in Binh Dinh province. Mangroves in Thi Nai havean important role in environment and local socio-economic development. However, their survival is threatened due to pests and diseases. Our study focused on wood-boring isopods, Sphaeroma terebrans. This species was first recorded in Vietnam. This isopod may have negative impacts for mangrove growth and it should be considered in planning and developing mangroves.
Keywords Mangrove, Wood-boring isopod, Thi Nai lagoon, Binh Dinh province
 

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