Abstract The aquathermolysis of Liaohe heavy oil is described which involves the addition catalyst and hydrogen donors under steam injection conditions. laboratory aquathermolytic experiments were carried out with oil, water, catalysts, at different temperature (160~260°C) reaction time (24~240 hours). It was found that metal species could catalyze reactions extra-heavy for example, Fe(II) led to near 60% decrease in viscosity treated 240°C till 72 hours. However, using donor (tetralin),...

Summary The determination of optimal well locations and controls in the horizontal-well steamflooding heavy-oil reservoirs is a meaningful but also challenging task for complex types complicated mechanisms. In this paper, framework that combines optimization algorithms reservoir simulator together proposed to solve problem. Two typical algorithms, particle-swarm (PSO) mesh adaptive direct search (MADS), are both used study their performance on well-placement optimization, well-control joint...

Abstract In consideration of the difficulty to setup conventional steam generator on offshore production platform, a compact and flue gas is developed thermally stimulate heavy oil reservoir, which consists water treatment injection unit, fuel air metering controlling unit. The temperature generated usually 200-350°C with 13.1-28.3wt% gas, pressure could be up 20MPa, rate 80-270 m3/day. past two years, cyclic steam-flue co-injection are applied 8 horizontal wells completed or non-thermally...

Abstract Surface steam injection is the most common enhanced oil recovery (EOR) technology used in heavy production. Nevertheless, limits exist due to heat loss for deep reservoirs. In process of injection, adding a certain amount nitrogen, which can reduce loss, maintain formation pressure and expand chamber, effectively improve development efficiency injection. this research, high-temperature-pressure pressure/volume/temperature (PVT) measurements sand pack flooding experiments have been...

Summary There are a lot of sludges produced in oil production and storage processes Liaohe Oil Field. Usually complicated chemical involved treating the sludge effectively such surface-treatment subject to high cost environmental challenges. Therefore, feasibility performance injection into steam-stimulated wells, sequestration associated heavy-oil-recovery improvement investigated on basis results laboratory research field operation. The originally from reservoir comprises mainly water,...

Abstract Gas and Electrical Heating Assisted Gravity Drainage(GEAGD in short) is a new heavy oil production technology, which, dual parallel horizontal wells or combination of vertical well are involved as electric dipole moments to heat the reservoir distributed resistive method. At same time, upper used gas (N2, CO2, flue gas, hydrocarbon etc.) injection well, lower well. GEAGD applicable potential enhance rate recovery for reservoirs produced by cold steam because it has many advantages...

Summary Horizontal wells are widely drilled to produce heavy oil because of their large reservoir contact. For example, there more than 500 horizontal operated in cyclic-steam-stimulation (CSS) or steam-assisted gravity-drainage (SAGD) processes Liaohe field. The length these usually ranges from 100 m. But it is challenging recover along a well proportionally by conventional steam-injection poor steam conformance the well, which derived heterogeneity, horizontal-well length, and properties....

Weak gel is a kind of three-dimensional cross-linking system with low polymer concentration and appropriate agents, dominated by intermolecular cross-linking, supplemented intramolecular weak degree. In this paper, the microstructure properties were observed evaluated under different conditions. Seepage behavior experiments parallel core displacement carried out to evaluate profile control flooding performance gel. Under certain concentration, increase in cross-linker reticular structure...

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 A modular multiple thermal fluid generator is introduced to enhance heavy oil production, which consists of water treatment system, fuel injection air compressor, central burning and heat exchanging measuring controlling system. All the components are mounted in three separated light shelters, easy be lifted installed, especially on offshore production platform. It could operated under 350 ℃ 20 MPa, temperature GWR (ratio volume gas equivalent steam standard conditions) adjusted by...

Abstract Horizontal wells are widely drilled to produce heavy oil for its large reservoir contact, and the length of horizontal well usually ranges from 100m longer than 1000m. Up now, limited attention attached flow in wellbore vicinity influence on production performance. In fact, resistance should not be ignored cold production, even thermal processes such as CSS. order investigate well, rheological characteristic water mixture measured at different temperature cut, according improvement...

Abstract In consideration of the challenges SAGD process such as high watercut, elevated temperature produced fluid, and heat loss to overburden layer, combined CO2 sequestration electrical heating assisted gravity drainage (CSEAGD in short) is taken into enhance heavy oil production, especially for water sensitive reservoirs well, condition short offshore desert. a typical CSEAGD process, two parallel horizontal wells are drilled injection well production respectively, both serve electrodes...

Abstract Horizontal well steam injection is effective to recover heavy oil for its large reservoir contact. To date, more than 150 horizontal wells have been drilled in Shuguang region, most of them are operated stimulation and SAGD processes, completed with slotted liner at length from 100 m 500 m. But it much challenging along proportionally because characteristics, heterogeneity. Results simulation field temperature testing show that only about half wellbore recovered well, average OSR...

Abstract The steam and flue gas co-injection technology is proposed applied to NN Oilfield whose oil viscosity ranges from 413 741mPa.s for field pilot since 2008. With increase of the stimulation cycles, channeling problem had bad influence on production performance, rate declined rapidly. To further improve recovery, research carried out optimization replacement method. First, reasons breakthrough are analyzed. Potential methods all analyzed compared by reservoir simulation physical...

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 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...

This paper proposes a method for the ship target azimuth offset correction on Synthetic Aperture Radar (SAR) image using Automatic Identification System (AIS) data. Traditional AIS and SAR matching usually use position, size, other information. uses continuous position sequence around acquisition time, that is, complete trajectory, to calculate slant range between space-borne platform. By deriving range, radial velocity can be obtained. According velocity, of moving is estimated correct ship's image.

Abstract As a new potential mean of artificial lift production, production using progressive cavity pump (PCP) has many advantages such as energy saving, lower first investment, and convenient in management. However, it is more challenging to implement this lifting method thermal heavy oil for the temperature limitation elastomer stator bonding agent, hostile vibration wellbore environment, result, up date, there no application PCP Liaohe Oilfield which largest field China. An applicable...

Synergistic flooding and gravity drainage by steam gas (SFGD) is an innovative alternative to SAGD SAGP, considering its potential enhance oil recovery improve production rate. This research presents 3D physical experiments of numerical simulations SFGD in offshore heavy reservoir Bohai Oilfield, China. SAGP synergistic are carrird out. The expanding process the chamber performance different stages compared between SFGD. And mechanism analyzed. Then, through detailed SFGD, reasonable...