Carbon dioxide from carbon oxide gas fields often includes methane and other gases, which increases the risk of phase changes during pipeline transport. Such can pose significant challenges in designing transport systems for stable efficient flow. Understanding physical properties these mixtures, such as density, specific heat, viscosity, compressibility factor, is essential safe, economic This paper focuses on both pure CO a high-CO mixture (90% CO, 10% CH) working fluids. Using extensive...

The geological reserves of ordinary heavy oil suitable for thermal injection development in Bohai Oilfield are about 450 million tons. traditional recovery process uses a two trip injection-production string method, which frequently starts and stops operations, resulting additional cold damage high costs. efficiency the jet pump integrated system is also low, production control difficult. Therefore, based on results an field test electric submersible production, this article optimizes its...

Active substances such as asphaltene and resin in heavy oil tend to absorb on the oil–water interface. Thus, water would easily emulsify into water-in-oil (W/O) emulsion under shared action of formation porous media. Emulsification produced fluid during recovery is important for accurately calculating recovery. Studies properties can effectively forecast reservoir production dynamics. Therefore, water/steam flooding experiments at different permeabilities, viscosity, varying temperature were...

Heavy oil emulsions such as water in (W/O), (O/W), and (W/O/W) would be formed during the development of heavy reservoirs. The key to efficient reservoirs is clarify fluidity formation pores medium. In this study, main factors that determine emulsion were analyzed under condition simulating reasons for difference between viscosity medium measured by laboratory rheometer analyzed. Then, experiments have confirmed shortcomings current screening evaluation method emulsified reducer. Finally,...

Abstract Profile modification of injection wells or water plugging production are the most common ways to improve oil recovery with continuous development reservoirs. For high temperature and high‐salt gas reservoirs, agent is required have certain stability under conditions. Polymer gel one commonly used agents in fields. This article conducted detailed experimental research mechanism analysis on six systems composed by two types polymer (hydrolyzed polyacrylamide [HPAM] terpolymer L‐1)...

According to numerous laboratory experiments and field applications, polymer flooding can effectively modify the liquid absorption profile increase sweep efficiency, thereby enhancing oil recovery. However, long-term injection of polymers decreases effective permeability reservoir plugs formation pores, resulting in irreversible damage. In development process, types concentrations must be selected according avoid problems such as plugging pores. This study was aimed at clarifying degree...

Abstract Affected by the surrounding injection and production wells, formation near infill adjustment well is in an abnormal pressure state, drilling completion operations are prone to complex situations accidents such as leakage overflow. The conventional shut-in method close all water wells around ensure safety of operation, but at same time reduce oil field production. This paper proposes a design for based on injection-production data mining. uses index liquid productivity target...

Abstract In the process of oil and gas field development, pore characteristics reservoir are main factors that affect capacity production efficiency. The physical property parameters pressure distribution layers have changed greatly, system multi-pressure layer is formed underground multi-layer heterogeneous sandstone after water injection chemical injection. Accurate prediction properties formation changes significance for efficient safe operation reservoirs. this paper, based on...

Abstract Adjustment wells need to be deployed in the middle and late stages of oilfield development improve efficiency. However, multiple pressure systems would happened fault block oilfields due geological faults are developed multi-layer joint water injection. The well kick leakage happen during drilling completion operations adjustment because large dynamic changes such as high-pressure or low-pressure. A prediction method established base on seepage theory fluid mechanics order ensure...

Abstract It is helpful to better understand the flow state of produced fluid in different stages by studying characteristics cycle steam stimulation (CSS short) heavy oil reservoirs from reservoir wellhead, and provide more research for CSS replacement technologies a clear direction. However, there are few studies on fluids, mechanism understanding not very clear. This article starts with laboratory experiments study factors that affect fluidity Bohai Oilfield. found temperature, water...

Abstract Multi-thermal fluid simulation was conducted for offshore heavy oil reservoir such as Nanbu 35-2 in Bohai Bay Oilfield since 2008. Field well integrity testing result shows that Insulated tubing corrosion is found many multi-thermal injection wells. has become one of the largest problems project. It will negatively affect development performance and also indeed a risky operation under high temperature pressure. In order to effectively prevent problem insulated tubing, principles...

Abstract Affected by the surrounding injection and production wells, formation near infill adjustment well is in an abnormal pressure state, drilling completion operations are prone to complex situations accidents such as leakage overflow. The conventional shut down method close all water wells within 500 meters from ensure safety of operation, but at same time reduce oil field production. This paper proposes a design for shut-in around based on injection-production data mining. influence...

Abstract The hollow rod electric heating (HREH) technology can greatly increase the temperature of fluid in wellbore and improve its fluidity, which is widely used pump wells. Bohai offshore oilfields also have urgent application requirements for HREH due to wide distribution heavy oil high waxy crude oil. However, more than 90% wells there are produced by submersible pumps (ESPs). None these christmas trees use suitable ESP using technology. Based on conventional tree with only one main...

Abstract Hydraulic fracturing has a significant effect on increasing production and injection of oil water wells in low-permeability tight reservoirs. Hydrogen sulfide (H2S) was generated after hydraulic Longxi Block Daqing Oilfield. The maximum hydrogen content casing gas reached 232 ppm, far exceeding the safety critical concentration value (20 ppm), which increased risk difficulty construction operation. In order to reveal influence mechanism H2S generation oilfield, experimental...