When implementing the SWAG technology, the degree of stability of the water-gas mixture plays a key role. A many factors of various nature is known to the suppression of the coalescence of gas bubbles is facilitated. This article presents the results of studies of the effect of surfactants of various compositions and concentrations on the operation of a multistage centrifugal pump when pumping water-gas mixtures. The foaming agent disolvan 4411 is determined to the degree of negative influence of free gas on the characteristics of the pump is significantly reduced. The reagent Neftenol VVD provides operating parameters very close to the characteristics of the pump when using disolvan 4411. The concentration of Neftenol VVD, recommended for addition to the water-gas mixture, has been determined. The expediency of choosing this surfactant is also due to the fact that the use of this reagent improves the injection capacity of wells. Keywords: multistage centrifugal pump; ejector; water-gas mixture; foaming surfactants.
Nowadays one of the most actual issues in oil & gas production on the fields is increasing of workover interval, especially in conditions of underdeveloped infrastructure of petroleum objects. In this paper the gas-jet technologies of the well reactivation and the well operation in abnormal operational conditions are proposed to solve actual problems of hydrocarbons (HC) production. This method is proposed as alternative of traditional jet pump (JP) technology. Analysis of current theories and practices of jet device (JD) application illustrated that today the least researched JD are JD for ejection passive fluid by power high pressure gas. They are named gas-jet devices (GJD). In this connection experimental studies of GJD were carried out. In this paper the results of complex experimental studies of gas-jet gas devices (GJGD) and two-phase gas-jet liquid devices (GJLD) and summarized characteristics of their work are described. As result of theoretical analysis and experimental studies optimal design of sonic GJD with the cylindrical throat depending on the type of passive stream was determined. Also influence of passive and power fluid on characteristics of GJD work was studied. Based on high volume of experimental studies results the procedure of GJD calculation for specific technological conditions was created. Moreover the technological schemes of optimization of gaslift wells on the Eastern Area of Orenburg Oil-Gas Condensate Field (EA OOGCF) and reactivation and operation of water-flooded gas wells by using wellhead and downhole GJD were proposed.
High mechanical impurities content in production fluid is one of the main causes high mechanical impurities content in production fluid. In the field practice there are many technologies to minimize solid phase flow from reservoir to the bottomhole and various technique units to protect submersible pumping equipment. However, currently there is no detailed study of technical and technological efficiency parameters. Different methods and technologies to solve the problems of oil (water) well production, complicated by solid phase flow, are used. In this paper the study results of the submersible sand centrifugal separation for artificial lift are presented, with consideration of the abnormal well conditions. In Gubkin University at Reservoir and Production Petroleum Engineering Department (RPPED) experimental stand unit to complex study of submersible sand separator (model “PSM") with hydraulic gate was constructed. Experimental stand unit allows determining submersible sand separator (SSS) efficiency. The submersible sand separator experimental stand studies have been conducted on model mixtures “water – solid particles (suspended solids content up to below 2 g/l)" and “water – gas (flow gas content up to 60%) – solid particles". The influence patterns of suspended solids content, inlet flow gas content and granulometric on “PSM" separation efficiency are determined. The “PSM" efficiency was experimentally confirmed and the separation coefficient values were obtained, which exceeded the performance of the similar devices. The workflow to select candidate-wells for this protective device application was developed. A new technological scheme to lift separated impurities bypassing submersible pumping equipment on the day surface is proposed.
Waterflooding -is currently the most popular method of oilfield development, but very often it does not guarantee high development effectiveness. This fact is the significant problem taking into account that the amount of hard to recover reserves is being increased constantly. The combined water and gas injection to the layer enables us to essentially increase the oil recovery ratio. Use of associated gas for water-gas influence also enables us to solve a problem of its utilization.About 100 field applications of WGI are known since this technology was used in North Pembina (Canada 1957 year) for the first time, and only single cases failed.Today, different technologies of WGI are applied that can be classified in two ways: alternate or simultaneous injection of water and gas (WAG or SWAG Injection).However, traditional ways of applying WGI were not widespread in Russian oil fields, but instead significant amounts of associated gas were flared. WAG compressor technology requires the purchasing of import equipment, essential investments in the initial stage, and high operating costs. Besides compressor stations, the construction of gas treatment plants is required.The separation of rich fraction from associated gas is required for the proper work functioning of compressors. These fractions are not always utilized and than the usage of dry gas for WGI it is less effective in terms of increasing oil recovery.
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