Due to the significant differences in development modes and operation rules of underground gas storage (UGS) reservoir, design UGS construction has its own particularity complexity. Key evaluation techniques process reservoir being converted into were proposed field application was analyzed. The experience first batch commercial China summarized, mechanisms multi-cycle injection production with large flux short-term examined some concepts such as dynamic sealing traps, effective pore volume...

To investigate the substitutability of simulation results using single-dome combustor as computational domain to triple-dome combustor, three-dimensional numerical simulations were conducted on both models and differences in various performances between two combustors compared analyzed. The findings reveal that obtained can effectively substitute for those terms critical performance metrics, including velocity distribution central cross-section, morphology size back-flow regions, total...

Abstract In the process of oil and gas production, reservoir pressure depletion leads to changes in pore in-situ stress caprock, which may reactivate closed faults break sealing make depleted reservoirs unsuitable for storage. order effectively evaluate caprock above provide a basis reasonable selection injection time location storage, this paper comprehensively considers fault slip potential (FSP) tensile (FTP), establishes evaluation model reservoir. The influences distance from top,...

In view of the gap between inflow-performance forecasted by traditional equation and actual inflow-performance, experiments gas-gas alternating seepage flow gas-water were carried out, a modified relationship considering gas permeability change due to water invasion was established. This verified example analysis. The experimental results show that: net pay, when water-invaded reservoirs are converted into underground storage, is different from that during field development, in value...

Rock damage appears in brittle shale even prior to peak stress (i.e., before failure) due the occurrence of microcracks these rocks. In this work, a coupled hydromechanical model was built by incorporating mechanical and fluid seepage induced stresses around wellbore during drilling. The borehole instability mechanism hard-brittle studied. results show that if well is simply drilled into formation, formation can be subjected rock damage. maximum failure ratio increases with drilling time. A...

To improve the operational efficiency of a hammer mill and delve into high-efficiency, energy-saving grinding mechanism, crucial parameters influencing corn straw were identified as spindle speed, hammer–sieve gap, sieve pore diameter. According to force analysis kinematics analysis, key factors affecting The process was studied using computational fluid dynamics (CFDs) discrete element method (DEM) gas–solid coupling numerical simulation experiment. results showed that with growth time,...

Abstract Fracture pressure is the key parameter both for horizontal drilling and hydraulic fracturing in shale gas reservoir. Reservoir depletion will push change of fracture pressure. Previous studies showed that be decreased with reservoir depletion, which not suitable anisotropic Aiming at resolving this problem, a novel evaluation was established, can used to evaluate influence on anisotropy, well inclination. The results increased strongly has tiny difference between various reservoirs...

The intersection behavior of hydraulic fractures and single natural has been studied in detail; however, fractured reservoirs, are numerous interlaced the multiple occurs during fracturing process. This is more complex there a lack research on this topic at present. In study, numerical simulation model interaction between series was established, main factors that affect formation scale fracture network reservoir were using method, parameters also studied. results showed trend, situ stress...

The regulation of the seasonal energy supply for natural gas and storage fossil are important to society. To achieve it, storing a large amount in porous underground media is one government’s choices. Due successful lesson learned from oil industry, has been regarded as most potential long−term method. In this paper, we developed new workflow evaluate performance reservoir−type (UGS). theoretical background includes correction average formation pressure (AFP) deviation factor by error theory...

The bottom hole fluctuating pressure has a large influence on the wellbore instability. To address this problem, firstly, according to principle of seepage mechanics, we established calculation model change in pore around radius under pressure; then, through laboratory rock mechanics test and damage theory analysis, law formation strength action static hydration dynamic are determined; finally, based porous media, quantitative evaluation method for risk instability is changing pattern...

Abstract To meet the development needs of aeroengines for high thrust-to-weight ratios and fuel-air ratios, a temperature rise triple-swirler main combustor was designed with total ratio 0.037, utilising advanced technologies including staged combustion, multi-point injection multi-inclined hole cooling. Fluent software used to conduct numerical simulations under both takeoff idle conditions, thereby obtaining distribution characteristics velocity fields within combustor, as well generation...

Abstract This work addresses the ongoing challenge of optimizing sand control screens, attributed to a limited understanding screen blocking. A novel one‐way computational fluid dynamics and discrete element method (CFD–DEM) coupling technique is presented analyze structural parameters unconsolidated prepacked gravel screens (PPGS). CFD–DEM involves systematically investigating width punched slot on outer protective screen, size gravel, efficiency packing improve antiblocking capability...

Long‐term oil and gas exploitation in reservoir will lead to pore pressure depletion. The depletion result changes of horizontal in‐situ stresses both reservoirs caprock formations. Using the geophysics logging data, magnitude orientation are studied. Furthermore, borehole stability can be affected by changes. To address this issue, dehydration from roof effect performed. Based on that, influence scope reduction above depleted estimated. effects development studied step with geomechanical model.

Abstract This paper presents a regional scale 3D geomechanical modeling study of the HB large produced gas field located in northwest China, which was converted to UGS facility June 2013. The reservoir is approximately 3500m deep and there are three faults completely penetrate caprock. potential caprock failure reservoir-bounding leakage after 14 years depleted production their dynamic containment during operations must be comprehensively evaluated. In this study, multi-disciplinary approach...

The dynamic displacement ductility and ultimate load-carrying capability of three partially-prestressed concrete (PPC) beams which were unbonded, experimentally obtained by applying impact load to their middle with dropping hammers, the typical measurement wave curves given. Influences a hammers gravitational potential energy on properties PPC beam analyzed. Based analog simulation theory, impact-load-carrying real unbonded span 12 m was gained. Results show that anti-impact are good,...

Shale reservoirs are characterized by extremely low porosity and permeability, poor connectivity, high content of clay minerals. This leads to the reservoir being vulnerable imbibition damage caused foaming agent solutions during foam drainage gas recovery. It results in decrease permeability reduction well production ultimate Therefore, as most commonly used production, it is particularly important. study structured follows. First, we analyze evaluate characteristics shale within target...

Due to the nature of hot dry rock resources and particularity development methods, fault activation induced by injection production rocks involves a complex multifield coupling mechanism. Traditional methods cannot effectively evaluate behavior in production. Aiming at above-mentioned problems, thermal-hydraulic-mechanical mathematical model is established solved finite element method. At same time, slip potential (FSP) introduced quantitatively risk under different conditions geological...

Abstract The enhanced geothermal system (EGS) is the key to improving heat production efficiency of hot dry rock (HDR). Due existence EGS, reservoir produces significant heterogeneity, so optimal design well location and injection rate has an important influence on recovery effect EGS. To solve this problem, a calculation model for output EGS under multifield coupling established in paper, different scales deeply analyzed. results show that displacement have great fracture‐network scales....

Summary Fault reactivation caused by reservoir depletion has been an important issue faced the oil and gas industry. Traditional views suggest that with depletion, only normal faults can be activated fault stability either monotonically decreases or increases, which are not consistent field observations. In this paper, a fault–sliding–potential (FSP) model was developed to analyze during for different types of faults. The evolution trend corresponding judging criteria were obtained...