In this report the methodologies and analysis for in situ remediation of heavy organics in petroleum production, transportation and processing industries is presented. First the heavy organics which deposit from petroleum fluids are indentified and it is pointed out that the more difficult member of these compounds to deal with are asphaltenes. Six different in situ remediation methods are introduced which include: (i) production scheme alteration techniques; (ii) chemical treatment techniques; (iii) external force filed techniques; (iv) mechanical treatment techniques; (v) thermal treatment techniques; (vi) biological methods. Also eight steps that appear to be necessary and effective in prevention and moderating the severity of the deposition and remediation are introduced which include: (a) Predictive modeling and analysis; (b) dual completion of oil wells; (c) compatibility tests of injection fluids before applications; (d) consideration of the compositional gradient of heavy organics in reservoir in production scheme design; (e) application of mechanical removal technologies for deposits; (f) application of solvent for dissolution of deposits; (g) hot oil treatment of the in situ deposits; and (h) use of dispersant to stabilize the heavy organics, specially asphaltenes from deposition. Overall, a proper route to combat arterial blockage in the oil and gas industry is to consider a combination of prediction modeling, experimentation and remediation.

Keywords: asphaltene, organic deposits, oil treatment, steric colloid

Geomechanical stability plays an important role in the development of long and deep wells. Borehole collapse, circulation losses and sand production are costly problems for the petroleum production. In the study presented here, a model based on Mohr-Coulomb failure criterion is used to analyze wellbore stability for three synthetic cases with different stress regimes. For each case, the analyses are performed to select wellbore inclination and azimuth for instability minimization. After the most stable well direction is selected, the analyses are carried out to determine free-sanding bottomhole flowing pressure (BHP) associated with different values of reservoir pressure in order to predict potential of sanding in the future production process. The study shows that geomechanical stability analysis can provide valuable supports for selecting wellbore trajectory and controlling sand production.

Keywords: water flooding, optimization algorithm, well rate allocation, artificial neural network, water cut.

Non-parametric criteria of diagnosis of dynamic processes variations based on production data vibrations distribution analysis are introduced in this work. Developed criteria allow diagnosing changes in conditions of investigated process and in case of analysis of data with asymmetric of distribution, and also when other criteria are inapplicable, inexpedient or complicated. The advantage of introduced approach is that it can be used for data transformed by different trend removal methods. Applicability of diagnostic criteria has been tested on both modelled
and practical examples of oil and gas production.

Brief overview of the idea on wettability of carbonate rocks in oil fields has been done. The approaches on assessment of carbonate rocks’ wettability in subsalt oil deposits of the Pripyatskiy trough based on the analysis of their formation conditions have been defined. It is maintained that oil recovery form carbonate reservoirs of the Pripyatskiy trough by means of counterflow capillary impregnation is impossible.

A great number of methods for complications control connected with wax accumulation in tubing (string) are used in oil and gas production. Recently interest to utilizing tubing walls wax cleaning means by mechanical method of oil and gas flow energy use. That is why plunger lifts using is suggested for tubing wax accumulation prevention in wells operated by flowing and gas-lift methods. In these lift plunger moving along lift due to flow energy prevents well production wax accumulations from adherence to tubing wells and moves these accumulations to the surface. Time for plunger hoisting and running-in is strongly influenced upon servic ability of plunger lift. In presented work problem of plunger hoisting and running – in time determination is consid red depending on well – reservoir system parameters and factors of time required for one plunger cycle is studied.

In the article are given the results of workability analysis of qualitative and quantitative methods of prediction of microbiological technology effectiveness. Now it is applied in the Pirallahi oilfield. The developed method is based on interconnection detection detween a geological hydrodynamic condition of reservoir system and producing ability of well. It includes the procedure of calculation automation and visualization of the basic characteristics of filtration field allocation. For each single taken well is being estimated its position on a filtration field and is being predicted its efficiency. The obtained data is being compared with the actual data of influence results. Using a rank qualifications method is being estimated the favored conditions of fluid displacement from the layer and is being generalized its connection with efficiency variations on all wells of the experimental ground. It is possible to recommend the proposed method for a preliminary estimate of other influence methods on the
oilfields.

In practice of operation of oil wells, since a chink and finishing point of preparation of oil to transport, in many cases in pipelines meet much phase, much componental and rheologically difficult liquid and gas systems. At movement of such systems on pipelines simultaneously with change of their physicist - chemical and rheologically features there is also a number of complications. Above noted with increase in transport expenses also very negatively influence efficiency of optimum operating modes of pipelines.
In work new technologies and ways for efficiency increase are resulted some at pipeline transport of considered systems taking into account them rheologically features, and their perspectives is marked.

Today’s well drilling is a complicated engineering and technology workflow made up of many chained steps. Failure of any of them leads to drilling problems, downhole failure or well liquidation. Well drilling industry is often challenged during development of deep overpressured (over hydrostatic) reservoirs. The most valuable solution in such conditions is evaluation of well path variants for different geology and technology constraints. This article focuses on how a calibrated 3D pore-pressure volume can be used to optimize well design when pore pressure and mud weight windows are the dominant issues in drilling.

Recent experimental investigations of liquid slip have yielded highly interesting results that can be of great use to both microfluidic and nanofluidic components of lab-on-a-chip systems. Experiments indicated a large influence of wall hydrophobicity and roughness, with a possible special role for carbon nanotube membranes. These experimental data are supported by both classical and recent theoretical considerations. This paper presents a summary of these data.

The formation of nanobubbles at solid-liquid interfaces has been studied using the atomic force microscopy (AFM) imaging technique. Nanobubble formation strongly depends on both the hydrophobicity of the solid surface and the polarity of the liquid subphase. While nanobubbles do not form on flat hydrophilic (silicon oxide wafer) surfaces immersed in water, they appear spontaneously at the interface of water against smooth, hydrophobic (silanized wafer) surfaces. From the experimental observations we draw the conclusion that the features observed in the AFM images are deformable, air-filled bubbles. In addition to the hydrophobicity of the solid surface, differences in solubility of air between two miscible fluids can also lead to formation of nanobubbles. We observe that nanobubbles appear at the interface of water against hydrophilic silicon oxide surfaces after in-situ mixing of ethanol and water in the fluid-cell. The shapes of the nanobubbles are well approximated by spherical caps, with width much larger than the height of the caps. We quantify the morphological distribution of nanobubbles by evaluating several important bubble parameters including surface coverage and radii of curvature. In conjunction, with an analytical model available in the literature, we use this information to estimate that the present nanobubble morphology may give rise to slip lengths ~1–2 μm in pressure driven flows for water flowing over the hydrophobic surface. The consistency of the calculated slip length with the experimental values reported in the literature, suggests that the apparent fluid slip observed experimentally at hydrophobic surfaces may arise from the presence of nanobubbles.

The representation for wavelet-coefficients of partial derivatives from functions of many variables belonging square summable functions space have received. This representation be linear combination of function`s wavelet-coefficients with coefficients what linearly depend on matrix elements of differentiate operators relative to separate variables. Application these differentiation formules of wavelet-expansion reduce the boundary problems for partial derivatives equations to system of alqebraic equations upon look for solution`s wavelet-coefficients which has stable numerical solution. By this method in particular the approximate solution of nonstationary plane and spase problems on underground hydrodinamic will be constructed.