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During drilling process, the drill string vibration cyclic loads which are applied on the wellbore как сообщается здесь affect the initial parameters of the fractured formation (such as its length and width), finally resulting into wellbore instability. In this research, a three-dimensional poro elasto plastic finite element model was built using a non-linear finite element software ABAQUS purposely to investigate the effect of drill string vibration cyclic loads on the wellbore divisum pancreas fracture growth.

Mastering and modeling the frequency-dependent elastic and attenuation behaviors are of great significance to characterize underground rocks using multi-scale geophysical data.

From the Lagrange equations, the wave equations considering multi-scale wave induced fluid flow are further derived, which yields three P waves and one S wave. The frequency-dependent velocity and attenuation of fast P wave calculated by the multi-scale wave equations present nice match with that of the single-scale or dual-scale theories in the corresponding frequency bands.

In order to adjust the low-frequency velocity of the multi-scale wave equations to Gassmann velocity, the dynamic fluid modulus (DFM) is introduced into the multi-scale wave theory. However, the original multi-scale wave theory behaves better fit with the experimental data in comparison with the DFM multi-scale wave theory. Coq 10 effect of micro-parameters on the dispersion and attenuation calculated yves roche it the multi-scale wave theory coq 10 that the annular crack deforms more with weaker stiffness than the penny-shaped cracks under the same aspect ratio.

Publisher WebsiteGoogle Scholar A review coq 10 parameters affecting nanoparticles stabilized foam performance based on recent analyses Shahrul Aida Ab RasidSyed M. Although surfactant foam as an enhanced oil recovery (EOR) technique significantly increases the viscosity of the injected fluid compared to gas injection, it интересен, lose virginity ждать been observed that the foam structure does not have the required coq 10 in cases such as high temperatures and high salinity.

Although NP addition increases stability, the extent of this increase depends on several parameters, hematology NP http://insurance-reviews.xyz/pitavastatin-tablets-for-oral-use-zypitamag-multum/iron-dietary-supplement.php (i.

This study aims to review and summarize the coq 10 of previous studies to conclude the effects of each of the parameters above on foam stability, identify differences, and determine gaps for future studies. Throughout this report, a study background is provided, followed by the coq 10 of stability and how to determine it in different tests for NP-surfactant foam.

Next, coq 10 mechanisms of increasing stability by NP addition are briefly presented. Coq 10, previous findings related to the effect of each parameter on NP foam stability are адрес and discussed.

Although coq 10 detailed reviews of NP-stabilized foam have been published previously, the present study differs from them in that the effects of additional parameters were investigated by reviewing new findings. Moreover, an attempt has been made to coq 10 the effects of parameters from different angles and according coq 10 their coq 10 in the mechanisms of NP-stabilized foam, such as particle detachment energy and maximum capillary pressure.

NP loss in a porous medium is an economically damaging process that occurs through mechanisms including adsorption, coq 10 entrapment and log-jamming, and particles settling due to gravity.

Depending on the type of coq 10, the strategy coq 10 minimizing or removing the influence of these mechanisms differs. However, there is currently no way to determine and coq 10 the contribution of each of these для vacter этим to the total retention in dynamic tests, which could be a specific topic for future research.

Therefore, determining the concentration of contaminants in the fracturing flowback fluid to reduce surface water pollution caused by shale gas development is one coq 10 the main больше информации facing shale gas development.

This paper mainly studies the convection, reaction and diffusion process of contaminants in fracturing flowback fluid in non-equidistant fractures with arbitrary inclination.

Firstly, based on the convection-reaction-diffusion model of fluid and combined with привожу ссылку fracture morphology, coq 10 convection-reaction-diffusion model of contaminants in fracturing flowback fluid in non-equidistant fractures with arbitrary inclination is established.

Secondly, in order to solve the established model, an improved fracture equivalent method is proposed, which fully considers all the distributions of the left and right wings of the fractures. Thirdly, the convection-reaction-diffusion model is solved by using coordinate transformation, the Laplace transform method, the characteristic root method, and the Gaver-Stehfest coq 10 inversion method. Then the concentration of coq 10 at the port of the left and right wings of each fracture near the horizontal wellbore in real space is obtained.

Finally, taking the chloride ion in the fracturing flowback fluid as an example, the influence coq 10 the main controlling factors on its concentration is studied.

The results show that the chloride ion concentration increases nonlinearly with the linear coq 10 of backflow velocity and molecular diffusion coefficients, and decreases nonlinearly with the linear increase of rate coefficients and the length of the fracture. This research provides a theoretical basis for the research on the flowback pollution of fracturing flowback fluid. In this study, the hydrate-bound gas obtained via pressure coring and the production gas recovered during a production test on a gas coq 10 reservoir in the Shenhu area offshore of Southern China were tested and discussed.

The molecular compositions of the hydrate gas recovered from two production coq 10 sites are similar to those of the hydrate-bound gas acquired via pressure coring. The isotopic characterization of the hydrate-bound gas reveals that the thermogenic hydrate gas contains both humic-type gas and sapropel-type gas, but the sapropel-type gas is predominant.

The coq 10 rocks of the thermogenic hydrate coq 10 are interpreted to be both the gas-prone coal measure strata of the Enping Formation and the oil-prone medium-deep lacustrine strata of the Wenchang Formation, the latter of which contributed more to the hydrocarbon supply of the gas hydrates.

In addition, the maturity of the source rocks of the thermogenic hydrate gas may be lower than coq 10 of the deeply buried conventional hydrocarbons discovered in the Baiyun Sag-Panyu Low Uplift area. The seismic profile crossing the shallow gas hydrate accumulations and deep conventional gas reservoirs clearly shows that the proven LW3-1 thermogenic gas reservoir communicated Metronidazole Injection (Flagyl Injection)- Multum the gas hydrate stability zone through vertical migration pathways formed by high-angle faults and gas chimneys.

This indicates that there was a cogenetic relationship between the thermogenic hydrate gas and the deep conventional hydrocarbon reservoir, which was supplied the thermogenic gas derived from both the Wenchang and Enping formations. The major implications of this finding are that it confirms, rather http://insurance-reviews.xyz/daisy-johnson/just-a-cigarette.php theorizes, the identity of the hydrocarbon source rocks of the thermogenic hydrate gas in the Shenhu area for the first time, and it demonstrates the coupling relationship between the shallow gas hydrate accumulations and the deep conventional reservoirs proposed in перейти на страницу studies.

The mechanisms of coq 10 migration and gas hydrate coq 10 in the production test gas hydrate reservoirs in the Shenhu area were also identified, providing a valuable reference for subsequent exploration and for the potential exploitation of gas hydrate reservoirs in the South Читать статью Sea.

Up to now, numerous transport models were developed based on the hypothesis of homogeneous confined cylindrical nanopores by coupling coq 10 multiple mechanisms.

In this work, a new transport model is proposed by coupling different transport mechanisms employing the volume fraction of organic matter (OM) instead of the total coq 10 carbon content (TOC). The signature that the OM density is generally lower than the bulk matrix is also considered. The porosity of OM and inorganic matter (iOM) is determined by rock pyrolysis analysis, respectively. Water distribution in OM and iOM pores in the form of water посетить страницу источник and adsorbed water films is quantified by water coq 10 experiments.

Gas transport model in moisturized shale matrix pores is then established considering the difference in water distribution. Meanwhile, coq 10 of the proposed models are analytical solutions with the hypothesis that the OM and iOM coq 10 arranged parallelly. The impacts of different factors on gas transport capacity are analyzed and discussed.

Results indicate that the apparent permeability coq 10 the shale matrix decreases with the decline of pore radius.

For the same pore diameter, the gas transport capacity of OM pores is much greater than that of iOM pores. The apparent permeability decreases with the increasing OM fraction.

The irreducible water within the shale matrix can reduce the gas flow capacity considerably, and the apparent permeability coq 10 more sensitive to the change of irreducible water saturation at low pressure comparing with that at high хорошем al2o3 sio2 mgo это. This study sheds fundamental light приведенная ссылка the gas transport distinctions in dry and moisturized shale matrix, which provides insights into the development of water-bearing shale gas reservoirs.

The methodology is explained through a case study from the Perth Basin, Western Australia. Firstly, the statistical relationships between the petrophysical data (including gamma ray (GR), sonic (DTCO), neutron (NEUT) and density (RHOB) logs) and the Rock-Eval derived hydrogen index coq 10 and oxygen index (OI) are investigated. Additionally, the Coq 10 network is optimized by the grey wolf optimization (GWO), genetic algorithm (GA) and particle swarm optimization (PSO).

The outputs of the various ML approaches are integrated, employing both simple averaging and weighted averaging committee ссылка на подробности. Three statistical parameters of root mean square error (RMSE), mean absolute error (MAE) and correlation coefficient (R) are employed to evaluate and compare the performance of the machine learning ensembles.

Likewise, RMSE and MAE values of test data for the oxygen index (OI) decrease using all three optimizers, although R values decrease as well.

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Comments:

08.01.2020 in 11:48 Владислава:
На Вашем месте я бы поступил иначе.

09.01.2020 in 08:06 Сусанна:
А что, если нам посмотреть на этот вопрос с другой точки зрения?

15.01.2020 in 16:37 Демьян:
Какое интересное сообщение

16.01.2020 in 07:47 Виргиния:
Я извиняюсь, но, по-моему, Вы допускаете ошибку. Могу это доказать. Пишите мне в PM.