Mitigation of Lost Circulation in Oil-Based Drilling Fluids Using Oil Absorbent Polymers

Abstract

In order to mitigate the loss circulation of oil-based drilling fluids (OBDFs), an oil-absorbent polymer (OAP) composed by methylmethacrylate (MMA), butyl acrylate (BA), and hexadecyl methacrylate (HMA) was synthesized by suspension polymerization and characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA) and scanning electronic microscopy (SEM). The oil-absorptive capacity of OAP under different solvents was measured as the function of temperature and time. The effect of the OAP on the rheological and filtration properties of OBDFs was initially evaluated, and then the sealing property of OAP particles as lost circulation materials (LCMs) was examined by a high-temperature and high-pressure (HTHP) filtration test, a sand bed filtration test, a permeable plugging test, and a fracture sealing testing. The test results indicated that the addition of OAP had relatively little influence on the rheological properties of OBDF at content lower than 1.5 w/v % but increased the fluid viscosity remarkably at content higher than 3 w/v %. It could reduce the HTHP filtration and improve the sealing capacity of OBDF significantly. In the sealing treatment, after addition into the OBDF, the OAP particles could absorb oil accompanied with volume enlargement, which led to the increase of the fluid viscosity and slowing down of the fluid loss speed. The swelled and deformable OAP particles could be squeezed into the micro-fractures with self-adoption and seal the loss channel. More important, fluid loss was dramatically reduced when OAP particles were combined with other conventional LCMs by a synergistic effect.

Investigating the efficacy of novel organoclay as a rheological additive for enhancing the performance of oil-based drilling fluids

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Synthesis and performance evaluation of water‐absorbing resin coated with polymethyl methacrylate as a lost circulation material

“…After testing, the volume of the material increased due to the oil absorption of the material, which significantly increased the rheological properties of the drilling fluid. After mixing with conventional LCM materials, the loss of the drilling fluid was significantly reduced 20 …”

“…After mixing with conventional LCM materials, the loss of the drilling fluid was significantly reduced. 20 Absorbent resin has unique advantages as an LCM for water-based drilling fluid. However, this material has a fast water absorption and expansion speed, this can cause a sharp increase in the viscosity of the drilling fluid, leading to difficulties in pumping.…”

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“…The stability, strength, and high thermal conductivity of nanomaterials is essential for the improvement of oil and gas downhole separations [8]. In this regard, nanotechnology contributes to the development and maintenance of drilling process equipment, allowing improved water and corrosion resistance, better reliability, stable rheological properties, and filtrate loss issues of wellbore instability [9,10]. The drilling industry has been revolutionized by the modifications of additives in drilling fluids to meet specific downhole and environmental requirements, as well as tunable rheological properties.…”