The Dengying Formation within Pengtan 1 well area in the Sichuan Basin is a vital gas reservoir for exploration and development. situated complex fault block structure characterized by multistage evolution, leading to complicated distribution of tectonic fractures crucial accumulation migration oil gas. This study establishes geological model describe patterns observed region conducts numerical simulations paleotectonic stress field. Moreover, we combine rock fracture criteria strain surface...

The accelerating industrialization process of China expanded coal consumption and induced the depletion resource reserves. Meanwhile, vast amounts resources are “trapped” since they located beneath buildings, railways, water bodies, which is termed “three-limitation” problem in China. In order to minimize damage extraction two villages Weibei Coalfield, China, a modified room-and-pillar method integrated with backfilling. This work conducted series numerical tests determine optimal design...

Abstract The reconstruction from the measured visibilities to signal in radio interferometry is an ill-posed inverse problem. compressed sensing technology represented by sparsity averaging reweighted analysis (SARA) has been successfully applied radio-interferometric imaging. However, traditional SARA algorithm solves L 1 norm minimization problem instead of 0 one, which a bias In this paper, q proximal gradient with < proposed ameliorate and obtain accurate solution interferometry....

Existing research rarely considers the rough surface morphology of natural fractures and radial migration particles within along with their plugging behavior simultaneously. This study innovatively establishes a wedge-shaped flow space model using numerical fracture synthesis techniques. The computational fluid dynamics-discrete element method was used to simulate migration, bridging, processes under different factors. results show that size rock samples does not constrain high-precision...

Abstract In most harmonic reducers, wear failure mainly occurs in the flex-spline and flexible bearing. However, models like LHD-I-25, unique tooth profile shifts primary issue to circular spline contact. Since reducers LHD-I-25 are crucial robotic joints prone wear, understanding their mechanisms is essential for mitigating failure. This article takes reducer as research object, explores surface lubrication of its spline. Considering working environment reducer, we derived Reynolds equation...

Borehole instability was frequently encountered during shale gas drilling. Most conventional models are not applicable to layered formation's wellbore stability analysis on account of anisotropic strength characteristic. In this study, an empirical equation for predicting implemented in the Mogi–Coulomb criterion describe variations cohesive and friction angle formations. A collapse pressure model its appropriate solution method formations were proposed. The impact different criteria rock...

Fracture conductivity decline is a concern in the Tuscaloosa Marine Shale (TMS) wells due to high content of clay shale. An analytical well productivity model was developed this study considering pressure-dependent hydraulic fractures. The log-log diagnostic approach used identify boundary-dominated flow regime rather than linear regime. Case studies seven TMS indicated that proposed allows approximation field data with good accuracy. Production analyses revealed fracture Mississippi section...

An analytical model for predicting the productivity of Radial-lateral wells (RLW) drilled using radial jet drilling technology was developed in this work. The assumes uniformly distributed equal-geometry laterals draining oil or gas under pseudo-steady state flow conditions within lateral-reached drainage area. A numerical simulation and production data from three field cases RLW were used to compare validate model. result indicates that overestimates well rates by 7.7%, 3.25%, 8.8%,...

Abstract Hydraulic fracturing is one of the most critical techniques to enhance oil and gas recovery in unconventional reservoirs. Screen-out considered as serious problems against a safe, effective cost-saving hydraulic treatment A simple method for predicting probability screen-out highly desirable. semi-analytical model derived this paper describe configuration proppant pile within fracture predict time screen-out. Case study demonstrates good consistency between calculation result field...

Summary The low productivity of the oil wells in Tuscaloosa Marine Shale (TMS) Trend, located Louisiana and Mississippi, is a mystery. Production data from 55 TMS Trend were analyzed to identify possible means enhancing well productivity. −1/2 slope log–log plot for reservoir linear flow (RLF) was observed some wells, but not all, −1 boundary–dominated (BDF) has been seen past 5 years production. behavior attributed ultralow permeability matrix decline fracture conductivity, both which delay...

Abstract The use of multifractured horizontal wells has improved the efficiency hydrocarbon extraction from shale gas and oil plays. It is highly desirable to estimate characteristics reservoir well fracturing through production data analysis. Production rate transient 16 in Mississippi sections were analyzed local permeability hydraulic fracture parameters. Key factors affecting productivity have been identified for optimizing future completion. Based on theory distance investigation during...