Exploring deep and ultradeep wells has rapidly become more significant to meet the global demand for oil gas. The study of rheological filtration-loss properties is essential designing drilling muds determining their performance under operational conditions. Rheological were found have a negative impact when exposed elevated temperatures in wells. In this study, an amphoteric polymer (abbreviated PEX) was synthesized characterized using combination analyses: FTIR, SEM,

It is difficult to seal oil-based drilling fluids in the large pore and micro-fracture formation, there are few suitable materials for oil phase with good sealing ability at present. In order solve problem of lack fluids, acrylamide, 2-acrylamido-2-methylpropane sulfonic acid, acryloyl morpholine were used as monomers, N'N-methylenebisacrylamide was a cross-linking agent, Span-80 Tween-60 emulsifiers, 2,2′-azobis(2-methylpropionamidine) dihydrochloride an initiator. Polymer microsphere...

Pressure waves possess many significant applications in the oil and gas drilling engineering field, such as mud pulse telemetry (MPT) measurement while (MWD). The focus of this research is to study pressure wave propagation attenuation characteristics wellbore liquid-phase flow managed (MPD) by fast switching throttle valve (FSTV). First, a mathematical model transient along both upstream downstream directions proposed MPD FSTV based on one-dimensional theory. considering frictional shear...

As an indispensable part of cement slurry for high temperature and pressure oil gas wells, weighting materials have a significant impact on the carbon dioxide corrosion well cement-based composites.This paper studied carbonation process with three agents, evaluated compressive strength depth at 150 ℃. XRD, SEM MIP were used to study mechanism cement. When 21 days carbonation, growth rate hausmannite was 0.21 mm/d, hematite 0.24 barite 0.31 mm/d. The decreased after carbonation,and had minor...

Oil-well cement-based materials have inherent brittleness; therefore, they cannot be directly used to seal oil and gas wells for a long time. To improve the elasticity of oil-well composites, flexible epoxy resin system was developed. The flexibility, TG, SEM cured were evaluated. At same time, added its elasticity. compressive strength elastic modulus cement stone tested, microstructure analyzed by XRD, SEM/EDS. results showed that structure is compact, thermal decomposition temperature...

Foam fluids are widely used in petroleum engineering, but long-standing foam stability problems have limited the effectiveness of their use. The study explores synergistic effects and influencing factors SiO2 nanoparticles (SiO2-NPs) with different wettability properties three surfactants. paper investigates foaming performance types surfactants analyzes compares after adding hydrophilic hydrophobic SiO2-NPs from macroscopic as well microscopic perspectives, temperature inorganic salts on...

The integrity of oil well cement sheaths is closely related to the long-term production safety and gas wells. primary material used form a sheath brittle. In order reduce brittleness improve its flexibility resistance stress damage, nano-silica was modify polymer elastic particles, their properties were analyzed. influence modified particles on cement-based composite materials studied, microstructure particle sample results showed that effectively encapsulates improves hydrophilicity,...

The loss of drilling fluids often occurs during reservoir extraction in fractured formations, and the prediction natural fracture rate is vital for controlling loss. However, coupling model to wellbore flow has rarely been considered. Based on non-Newtonian fluid dynamics theory, this study considers Herschel–Buckley develops an updated numerical couple with flow. roughness characterized using continuous random accumulation method. verified by field data, its simulated results show average...

We present here a bibliometric analysis of publications on photosynthesis research from 1992 to 2009 in the Science Citation Index Expanded (SCI-Expanded) Web Science. This has allowed us examine growing trends and key topics this subject. have assessed document type, language publications, publication output, subject category, journal distribution, countries territories these institutions involved, hot highly cited papers. The top 30 countries/territories were ranked according their total...

Nanoparticles (NPs) have great potential for a variety of applications in several industries including oil and gas industry. The addition to the drilling fluids may benefit performance fluid properties. production, use, discharge NPs been raising concerns among environmentalists as they adverse effects on their ecology. Therefore, industry requires new ways enhance properties water-based fluids. In this study, low cost, high environmentally friendly mud was developed using sugarcane-bagasse...

The poor lubrication performance of water-based drilling mud hinders its application in the process extended, reach horizontal wells. To overcome this shortcoming, polyaspartate (PA) and poly(ethylene glycol) (PEG) were used to improve mud. conventional performances, performance, micro-image antiwear steel balls modified analyzed. results show that coefficient friction (COF) mixed with 10% PA 5% PEG was lowest, reaching 0.094, reduction rate COF 63.1%, cake stuck factor also lowest. addition...

The application of fiber in the completion fluid can improve rheological properties and plugging quality production layer by reduce damage filtrate to reservoir formation. However, there are few studies on influence fibers fluids flow behavior pores. In this paper, plant fiber, mineral synthetic discussed. Carbon bamboo polypropylene polyester selected as research objects. dependence property polymer solution type, concentration, temperature, shear rate is evaluated. evaluation carried out...

This study established a full-size coupling model of unsteady flow and heat transfer between U-tube ground considering the insulation layer, which was solved by finite volume method. The model's reliability validated through experimental data geothermal in Xi'an. maximum relative error this 6.46% 2–6 h, average 0.51% 7–72 h. performed better than other two models published. According to outlet temperature, thermal power, quantity heat, temperature distribution at different depths, optimal...