Supercritical CO2 (SC-CO2) fracturing technology in unconventional reservoirs attracts attention for ensuring reservoir cleanliness, conserving water, and promoting sequestration. Addressing concerns over constrained fracture paths inadequate consideration of simulating SC-CO2 fracturing, this study integrates triaxial testing rock parameters HY oilfield. A compiled program Abaqus, assigning global cohesive elements to rocks, was developed comparing the mechanisms hydraulic fracturing....

China is rich in low-permeability oil and gas resources, offering significant potential for exploration development. However, reservoirs are characterized by poor reservoir properties, high seepage resistance, limited effectiveness of enhancement measures. Therefore, understanding the key factors affecting capacity during stimulation crucial. This study focuses on core samples from South Sea investigates mechanisms damage fractures under three conditions: fracturing fluid systems, solid...

A novel 2D porous Zr(IV)-based metal–organic framework (USTS-7) was assembled from 2,5-bis[2-(methylthio)ethylthio]terephthalic acid and ZrCl4. USTS-7 retains its stability in water, strong acid, base; moreover, it is highly luminescent displays a remarkable selective sensing property toward Cr2O72– aqueous solution with very low detection limit.

The oil and gas resources in the deep Paleogene system of South China Sea are abundant. However, due to its poor reservoir physical properties strong heterogeneity, needs be commercially exploited by hydraulic fracturing technology. In view challenges offshore low-permeability reservoirs, large-scale is not allowed because limited operation sites complex string structure. Taking H oilfield as target, based on concept integration geologic engineering techniques, parameters such number stages...

After hydraulic fracturing, unconventional reservoirs frequently encounter challenges related to limited effective proppant support distance and suboptimal placement. Due the strong heterogeneity of offshore reservoirs, which causes varying fracture roughnesses depending on different lithologies, a systematic study relationship between roughness transport could optimize operational parameters. This incorporates box dimension method for fractal analysis quantify in auto-correlated Gaussian...

Abstract Multistage fracturing technology is the primary means of reservoir stimulation in shale gas wells. However, productivity contribution each stage varies greatly. It essential to evaluate effect order make an optimized treatment design. In this study, we adopted integrated workflow assess main control factors geological and engineering parameters a novel approach was proposed for post-fracturing evaluation. For purpose, H block Zhaotong demonstration zone Sichuan, China, has been...

Reservoir rocks of the Pearl River Mouth Basin’s Lufeng Sag have low porosity (average 12.6%) and permeability 16.5 mD), requiring hydraulic fracturing to obtain economic production oil gas. To contribute understanding these reservoirs, promote successful in region, we analyzed mechanical properties tight sandstone. Moreover, introduced shear/tensile strength factor, combination with fracture toughness horizontal stress difference coefficient, as an innovative approach characterize ease...

Abstract Hydraulic fracturing is the key technology in development of shale gas reservoirs, and it mainly adopts volume to communicate hydraulic fractures with natural increase drainage area. In view difficulty characterizing complex created by multistaged horizontal wells immaturity optimization design methods, this study first evaluated stimulation effect based on treatment data microseismic data. Then, fracture characteristics after frac were considered, a post-frac simulation was studied...

Fracability characterizes the effectiveness of hydraulic fracturing. The existing assessment methods cannot reflect actual value due to a lack comprehensive consideration and neglect influences engineering factors. This study aims solve this problem by implementing geological static data production dynamic in multivariate analysis Zhaotong shale gas demonstration zone. First, reservoir quality index (RQI) was introduced evaluate exploration potential integrating parameters with gray...

Abstract Tight gas reservoirs have rich potential resources, which are hot spots in unconventional oil and exploration development. Due to their strong heterogeneity complex pore structures, the conventional approaches of productivity evaluation always difficulty predicting content. This study aims devise a new method interpret LX Block Ordos Basin using morphological theory fuzzy mathematics. First, core test results were used investigate reservoir quality physical properties. Then, change...

<title>Abstract</title> The LX tight gas reservoir displays significant heterogeneity, with a lack of alignment between engineering treatment and geological evaluation, leading to an unsatisfactory development outcome. Focusing on the Shihezi Formation LX, new comprehensive evaluation method is proposed for identifying sweet spots, taking into consideration both factors. objective function utilized post-frac production, grey correlation was employed quantitatively characterize weight...

This paper presents a comprehensive study of the dynamic response analysis vehicle–bridge coupled systems, with detailed simulation methods for vehicles, bridges, and wheel–road coupling relationships. The entire system is carried out using open-source finite element platform OpenSees. A novel three-dimensional introduced to model interactions between wheel road nodes. facilitates precise computation responses within system, including both vehicle bridge behaviors, along interaction forces...

Brittleness index (BI) is a key parameter used for reservoir fracability evaluation and "sweet spot" search in shale gas exploration. The existing assessment methods cannot guide the fracturing design field treatment due to their insufficient theoretical foundation neglect on influences of engineering factors. This study aims solve this problem by using thermodynamics criterion nonlinear fracture mechanics. First, quantitative relationship between energy loss rock brittleness was...

To accurately characterize the proppant transport pattern in rough and complex fracture elucidate interaction mechanism between fractures, study reconstructs a numerical model of identical size after fracturing rock samples from field. Based on Matlab, different auto-correlation Gaussian models were established to precisely evaluate roughness cracks by using fractal dimension method. The article, innovatively combines Boolean operations establish 3D model, which incorporates CFD-DEM with...