Application of a new family of organosilicon quadripolymer as a fluid loss additive for drilling fluid at high temperature

Abstract

An organosilicon quadripolymer of acrylamide (AM), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), N-vinylpyrrolidone (NVP) and a kind of organosilicon monomer was synthesized by solution free radical polymerization. The chemical structure of organosilicon quadripolymer was characterized by Fourier transform infrared (FTIR) spectroscopy, and molecular weight distribution was determinate by gel permeation chromatography (GPC) under the best optimum synthesis conditions, which were identified by orthogonal test according to filtrate volume of fresh water-based drilling fluid. The colloidal properties of the organosilicon quadripolymer drilling fluid were investigated in various media such as fresh-water, 4.0% salt-water, and saturated brine based fluid. The results showed that the filtrate volume decreased with the increase of the organosilicon quadripolymer concentration before and after the thermal aging test at 180 C for 16 h, and the filtrate volume after the thermal aging test was larger than that before the thermal aging test, but was smaller than the base fluid. The colloidal properties and the filtrate volume could be controlled effectively at aging temperatures not exceeding 200 C. The organosilicon quadripolymer drilling fluid performance was better than corresponding terpolymer without organosilicon group and shows favorable inhibitive property and was an excellent fluid loss additive for drilling fluid resisting high temperature in deep wells. A possible mechanism is proposed to explain the improvement according to the comparative adsorption experiment.

Comb‐shaped copolymer as filtrate loss reducer for water‐based drilling fluid

“…After 180 °C aging, the filtrate loss volume of APEG‐4.1 with higher APEG segment is the lowest, only 11.5 mL (Table ). The filtrate loss volume after aging process is generally larger than that before aging, because elevated temperature raises the permeability of the filter cake and lowers the clay colloidal stability . Here, the addition of copolymers helps maintain colloidal stability due to steric hindrance from the long side chains and comb‐shaped structure, thus the clay particles are protected from aggregation after hot rolling.…”

Life cycle toxicity assessment on deep-brine well drilling

“…Disposal of waste drilling fluid is considered one of the most serious environmental problems worldwide (Zou el al., 2011) because drilling fluid contains heavy metals (e.g., Cd, Hg, and Pb (Alimohammadi et al, 2013;Hong et al, 2014) and organic pollutants (e.g., acrylamide and poly vinyl pyrrolidone, Chu et al, 2013;Zhao et al, 2015). LCTA on industrial activities, including cement (Li et al, 2015), aluminum (Hong et al, 2012), copper (Memary et al, 2012), and caustic soda production (Hong et al, 2014) has been widely conducted.…”

Hydrophobic associated polymer based silica nanoparticles composite with core–shell structure as a filtrate reducer for drilling fluid at utra-high temperature

“…Secondly, Si-OH in SDFL molecules could act condensation with Si-OH on the surface of clay mineral and form firm chemical adsorption [15,41], as shown in Figure 22. This adsorption increased the treatment agent adsorption at the clay appearance under high temperature high pressure condition which made the water film at clay particle surface thicker and membrane hydration repulsion larger, thus effectively preventing the coalescence between the clay particles under high temperature and high pressure and maintaining reasonable particle size distribution which could form close mud cake and reduce loss.…”