The reservoir in the Anyue gas field, located Sichuan basin of China, belongs to second member Dengying formation and has distinctive geological features. It is characterized by strong heterogeneity, low porosity, permeability, locally developed natural fractures. space consists primarily corrosion holes, fractures, similar voids. Moreover, lower exhibits high water saturation a homogeneous bottom-water interface. Since it carbonate-based hydrocarbon with porosity deep acid fracturing proven...

Unconventional reservoirs have strong heterogeneity, with significant differences in the distribution of porosity and permeability. Fracturing is an important technology for increasing natural gas production unconventional oil reservoirs. For high temperature low permeability, rapid increase acid rock reaction rate leads to a decrease effective distance acidic fluids fracture conductivity, especially inability obtain support at tip, which restricts high-temperature To address above issues,...

The limestone reservoir of the Da’anzhai section is main production layer Jurassic tight oil in central Sichuan, with and strongly heterogeneous rocks. In early stages, small-scale plug removal acidification techniques were mainly applied to dacite reservoir. However, using a single conversion method was not suitable for reservoirs underdeveloped fractures. To address this challenge, we conducted large-scale real-world triaxial simulation test system experiments on hydraulic fracture...

Permian formation reservoir in the Sichuan Basin has characteristics of high temperature(153 °C), strong heterogeneity, thin thickness, low porosity and permeability(0.8 mD). In early stage, gelling acid fracturing was mainly used to increase gas production, but effect not good, average daily production wells after 20000–30000 m3. The operation is faced with problems fast rock reaction speed under temperature conductivity etching fracture closing pressure. view above technical problems, we...

The ultradeep carbonate reservoir in Sichuan Basin is characterized by deep burial depth, high temperature, and strong heterogeneity. In the early stage of production, vertical well acid fracturing main stimulation method, horizontal technology not mature enough to release production capacity gas wells. Segmented wells currently faces following problems: heterogeneity leads difficulty fine segmentation; temperature requires higher performance working fluid; reaction rate between rock fast...

Carbonate gas reservoirs in Sichuan are deeply buried, high temperature and strong heterogeneity. Staged acid fracturing is an effective means to improve production. acidizing of ultra-deep horizontal wells faces the following problems: 1. Strong reservoir heterogeneity leads difficulty fine segmentation; 2. The well section long running too many packers increases completion risk; 3. Under temperatures, reaction speed between rock rapid action distance short; 4. fracture conductivity low...

An organic ester p-nitrobenzyl acetate (PNBA) was synthesized and used to establish a kind of autogenic acid system through the hydrolysis acetic in situ. The can form homogeneous solution by adding an solvent. possesses desired characteristic which generate small amount below 120 °C large above 140 2 h. acid-generated ability at different time temperature studied detail. dissolution solid calcium carbonate rocks investigated. displayed lower on rock weak corrosion N80 steel sheet 150 °C. is...

For unconventional oil and gas reservoirs deep carbonate reservoirs, temporary plugging fracturing is an important technology to improve production. At present, the research of mainly focused on development high-performance agent, simulation fracture growth morphology test ability agent. There limited migration law agents in fractures, which affects optimization processes parameters. Through a crack sealing experimental device, taking into account influence rough cracks width, agent pressure...

The Shuangyu gas reservoirs in China has a reservoir depth of more than 7000 m and temperature 160 °C. It is fractured porous carbonate reservoir, the wells mainly establish production by acid fracturing. In early stage, was developed with vertical wells. After fracturing, natural low declined rapidly. To obtain higher production, large number highly deviated have been deployed reservoirs. Because diameter well small, subsection tool cannot be operated inside it, so it can only adopt...

Conventional fracture closure models typically assume homogeneous formation. This assumption renders complex pressure analysis during shut-in insufficient at present. In this paper, we use a cohesive zone method (CZM)-based finite element model to obtain the and minimum horizontal principal stress of major branch based on fall-off analysis. Key factors including leak-off rate, injection time, anisotropy are discussed in detail. A quantitative relationship between these is plotted reduce or...

Abstract Tahe, one of the largest scale oilfields which are discovered in western China recently, Ordovician carbonate as main storage, characterized with deeply embedding and various storage type, mainly cavities fractures. It is difficult to describe its serious heterogeneity there rare technical reference regarding reservoir modeling methodology. Commonly, geology based on well logging seismic data, stochastic method reasonable applied. However, Tahe oilfield has very limited data poor...

Shale oil reservoirs in the Daanzhai section of central Sichuan are mainly developed Daer subsection, with a rich resource base and great exploration development potential. However, shale reservoir is characterized by limestone interactions, poor physical properties, undeveloped fractures, large differences fracture pressure interactive reservoirs. Therefore, it necessary to use temporary plugging diverting fracturing technology improve complexity fractures reconstruction. To this end, an...

The burial depth of Penglai gas field reservoir in the Sichuan Basin China exceeds 7,000 m, and temperature is 160°C. belongs to fractured reservoir, there are many natural fractures distributed reservoir. Natural not only storage place gas, but also transportation channel gas. Gas wells mainly increase production through acid fracturing. In early stage, Field used gelled fracturing technology create an artificial fracture by injecting a large amount fluid. However, stimulation range very...

Abstract The Shuangyu gas reservoir in Southwest China is a fracture ultra deep carbonate reservoir. Its buried depth more than 7000m, and the temperature about 160°C. In early stage, vertical well acid fracturing method was used to obtain natural production, but production decreased rapidly after fracturing, which difficult achieve economic efficient development. Segmented of horizontal wells an effective way greatly increase production. However, segmented faces following problems: (1)High...

Solid oxide fuel cells can directly convert chemical energy of into electricity, not limited by Carnot cycle, greatly improve efficiency.GT-Kalina combined cycle system driven SOFC realize the cascade utilization exhaust heat, this way to efficiency.This paper based on SOFC-GT-Kalina as research object, using Aspen Plus establish process simulation, also analyzed effects main parameters performance system, in provide guidance for optimization and economic operation.By analysis, integrated...

This paper studies the influence of stone dust on adaptability polycarboxylate superplasticizer and cement by experiment paste slump mortar flow. The results indicate that mixed in increases with because large specific surface water demand dust. There is little effect fluidity loss when dosage below 18%, it will increase significantly more than 18%. be bad content manufactured sand over 10%. can evaluated method

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Abstract Nanoparticles can be adsorbed at the gas-liquid interface to improve stability of foam. However, homogeneous nanoparticles exhibit low surface activity, and their migration requires significant energy input. This leads harsh foaming conditions severely limits application in foam stability. A microfluidic visualisation model for study Janus nanoparticle complex systems was used investigate formation behaviour trapped bubbles a single connected pore-throat model. The generated pore...