الفهرس 
Experimental and MaterialsOnly 14 pages are availabe for public view
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Abstract
Drilling fluid (mud) is an important element in the drillmg of oil and natural g’is
wells in the whole world The principle function of the mud is to clein the bottom
of the wells from the cuttings, to cool the rig bits, to reduce the drill pipes stuck and
to control the formation and the hydrostatic pressures One of the most important
characteristics of the drilling fluids is to prevent leaking in the well foi mations
Also, the lost cuculation is one of the biggest contributors to drilling non
productive timc and ruins the specification olthe drilling process
This woik includes thiee chapters which aie the introduction, the expeiimental the
results and discussions followed by the deducted conclusions In this work, six
copolymers were prepaied fiom sodium and potassium aciylates Both salts
individually were copolymerized with acryl amide, methacrylic acid and acrylic
acid at different ratios The monomer reactivity ratios foi the copolymei ization
reactions of both of acrylate salts with acryl amide methacrylic acid and acrylic
acid, in solution with azobisisobutyronitrile (AIBN) as initiator, were estimated by
atomic adsorption analyzer The chemical structure was confu med by atomic
adsorption spectroscopy and FT-JR spectroscopy and the molecular weights of the
produced copolymers were determined by Gel Permeation Chromatography.
The prepared copolymers were investigated as loss circulation control materials by
measuring different filtration parameters such as spurt loss, fluid loss and
permeability plugging tester value accoiding to the Ameiican Petroleum Institute
(API) standard from the obtained data, it was found that the 0 6% of the poly [PA
co AlvI) (04 06) exhibited the best results of the filtration parameters among the othei
copolymers At the same time all the studied copolymeis enhanced the rheologicil
properties of the di illing mud These results wei e discussed on the light of the
swelling capacity of the copolymers.
The main conclusions of this svoI It nn be di awn in the followinij points
o The lost circulation control materials performance depended largely on the
rheological behavior of the mud.
• The filtiation characteristics weie enhanced by increasing the molar ratio