Water injection for oil displacement is one of the most effective ways to develop fractured-vuggy carbonate reservoirs. With increase in number rounds water injection, development effect gradually fails. The emergence high-pressure capacity expansion and technology allows increased production from old wells. Although has been implemented practice nearly 10 years reservoirs, its mechanism remains unclear, curve not apparent. In past, evaluating could only be done by measuring...

As the demands of tight-oil Enhanced Oil Recovery (EOR) and controlling anthropogenic carbon emission have become global challenges, Carbon Capture Utilization Sequestration (CCUS) has been recognized as an effective solution to resolve both needs. However, influential factors dioxide (CO2) geological storage in low permeability reservoirs not fully studied. Based on core samples from Huang-3 area Ordos Basin, feasibility CO2 sequestration are analyzed through caprock breakthrough tests a...

Tight sandstone reservoirs are ideal locations for CO2 storage. To evaluate the oil displacement efficiency and storage potential of in tight reservoir Huang 3 area Changqing Oilfield, four kinds experiments were conducted on core samples from Chang 8 Formation area. These performed using micro-displacement equipment, digital technology, an online CT scanning system; different processes recorded as three-dimensional images. The results show that flooding alternated with water scheme can...

Carbon neutrality has become the long-term development strategy of many countries worldwide, and widespread implementation CCUS (carbon capture, utilization, storage) is critical for achieving this goal. Ultralow permeability reservoirs have good storage shielding properties, making them ideal CO2 geological storage. into these dual purpose improving crude oil recovery protecting environment. However, physical properties ultralow are poor. Furthermore, distribution fractures often complex....

From the experience of CO2 storage in past, leakage part may be wellbore, fractures, faults, and cap rocks formation. Once leaks from it will pose a serious threat to life safety workers near well pad short time. Therefore, perspective single process storage, this paper studies risk injection Changqing Oilfield, Ordos Basin, simulates with diffusion model after toxic gas leakage, so as obtain concentration at different distances point. The range affected area is determined by critical value...

Abstract In order to limit the increase in global average temperature 1.5°C, it is necessary reduce carbon dioxide (CO 2 ) emissions by 45% 2030. CO capture, utilization and storage (CCUS) one of effective ways emissions. Geological provides a solution with lowest economic cost fastest effect for reducing This article proposes regional division method based on characteristics low‐permeability reservoirs Yanchang W oilfield China. The space divided into four regions: gas phase region,...

Aimed at the multi-scale fractures for stimulated reservoir volume (SRV)-fractured horizontal wells in shale gas reservoirs, a mathematical model of unsteady seepage is established, which considers characteristics dual media matrix and natural as well flow large-scale hydraulic fractures, based on discrete-fracture model. Multi-scale mechanisms, such desorption, Klinkenberg effect, diffusion are taken into consideration. A three-dimensional numerical finite method includes construction...

The fluids in horizontal wells can exhibit complicated flow behaviors with wall mass transfer, partly due to the interaction between main and radial influx along wellbore completion parameters used. This paper presents a novel regression model established based on experiment data retrieved from available literatures determine apparent friction factor for single phase flow. proposed has potential be readily applicable different perforation parameters, such as shot phasing density. Compared...

In this study, the pressure drop obtained from physical experiments and theoretical approaches of a single horizontal wellbore is reviewed comprehensive pressure-drop model derived for multibranch well. We propose new coupling fluid flow in wells reservoirs. Based on model, we introduce approach calculation well with variable mass transfer. To facilitate understanding entire was divided into three parts: (1) wellbore, (2) reservoir inflow (3) model. By incorporating acceleration, friction,...

The spontaneous ignition behavior is considered as one of the most important factors to success air injection process (AIP) application. Although theory crude oil easy understand, this phenomenon turned out be difficult capture in lab. In study, Frank–Kamenetskii method was applied investigate sample both theoretically and experimentally. thermal experiments were performed study oxidative characteristics samples obtain their kinetic data. data typical reservoir properties used predict...

Abstract Nowadays, different types of complex production wells are applied in challenging reservoirs order to maximize oil recovery. A representative application is the fishbone multilateral horizontal wells, which have advantages expanding drainage area information and reducing pressure loss long single lateral wellbore. This paper investigated performance derived a wellbore reservoir flow coupling model for bottom water reservoirs. The new considered plenty parameters that may significant...

The aim of this paper is to describe the pressure dynamic behaviour around a multilateral horizontal well in bottom water reservoir and get productivity by establishing an analytical transient flow model. An exact solution model derived means orthogonal transformation, method mirror images theory potential superimposition. For reservoirs, there supplementary boundary for aquifer. Given enough time, will change steady gradually. Correspondingly, index wells drive reservoirs can be calculated....

The coalbed methane (CBM) resources in the Qinshui Basin are abundant with exceptional production potential. Coalbed wells usually need to be hydraulically fractured build economical production. However, exploration and experiences have shown that penetration distances of hydraulic fractures vertical direction coal seams uncertain, which may lead fracture communication layers above beneath aquifer layers, resulting divergent dynamics among producers. It has been observed some CBM Block M...

The Longwangmiao Formation gas reservoir in the Moxi block of Sichuan Basin is a complex carbonate characterized by low porosity and permeability, strong heterogeneity, developed natural fractures, active water bodies. existence fractures allows bodies to easily channel along these resulting more complicated mechanism dynamic law gas-well production, which seriously impacts development. Therefore, core-based simulation experiment was designed for oil–water two-phase flow. Three main factors...