scholarly journals Optimization of injection parameters for temperature time response gel plugging agent

2021 ◽  
Vol 2109 (1) ◽  
pp. 012020
Author(s):  
Wei Yan ◽  
Ruibo Cao ◽  
Yingxue Ma
Keyword(s):  
Water Injection ◽  
Experimental Results ◽  
Time Response ◽  
Low Permeability ◽  
High Permeability ◽  
Injection Volume ◽  
Injection Speed ◽  
Injection Parameters ◽  
Medium Permeability ◽  
Temperature Time

Abstract Aiming at the temperature time response gel plugging agent developed by Daqing exploration and development institute. In this paper, the injection volume, injection speed and injection concentration are optimized. The experimental results show that: the temperature time response gel can achieve the best plugging effect under the injection volume 0.1PV, injection concentration 1000mg/L and injection speed 0.6ml/min. In the subsequent water injection stage, the conductivity of high permeability layer decreases from 72.7% to 0.7%, that of low permeability layer increases from 4.1% to 14.3%, and that of medium permeability layer increases from 23.2% to 85%.

An Experimental Study on Adaptability of a Novel Living Polymer Used in Low Permeability Fractured Reservoir

2013 ◽  
Vol 631-632 ◽  
pp. 140-144
Author(s):  
Li Li
Keyword(s):  
Oil Recovery ◽  
Volume Expansion ◽  
Concentration Ratio ◽  
Produced Water ◽  
Water Injection ◽  
Low Permeability ◽  
Fractured Reservoir ◽  
Injection Volume ◽  
Swelling Rate ◽  
Injection Property

In this paper, the produced water in Daqing oilfield was detected, includes the viscosity and concentration ratio of living polymer (LH-1), interfacial tension and swelling rate of particle polymer (LHP-1). And its adaptability in low permeable fracture core was also tested. The results show that the injection property is good if the living polymer (LH-1) and the particle polymer (LHP-1) are used together, the volume-expansion particle polymer can effectively plugging the high permeable layer in bottom of the reservoir and improve water injection profile. The best injection volume of LH-1is 0.32 PV, and enhances oil recovery rate is 18.4%.

Swelling and Deswelling Kinetics of Superabsorbent Polymer

2016 ◽  
Author(s):  
Cody Chancellor ◽  
Mahmoud Elsharafi
Keyword(s):  
Water Injection ◽  
Oil Industry ◽  
Deionized Water ◽  
Effect Of Temperature ◽  
Low Permeability ◽  
Superabsorbent Polymer ◽  
Water Production ◽  
High Permeability ◽  
Kinetics Of ◽  
Oil Formation

In the oil industry, techniques that decrease unwanted water production have drawn large amounts of interest from many companies. During water injection operations, water is injected into the reservoir in order to extract oil remaining in the formation. Due to the heterogeneity in the reservoir formation, oil production will decline and water production will increase as the injected water sweeps the high permeability zones. In order to flush out the oil remaining in the low permeability zones, many treatments have been used. One such treatment involves the injection of a superabsorbent polymer (SAP) into the high permeability zones. The swelled polymer will decrease heterogeneity in the reservoir’s permeability, thus forcing injected water into the oil rich, unswept zones/areas of the formation. Proper application of an SAP can have a dramatic impact on both the production and lifespan of mature oil wells. Understanding the swelling and deswelling kinetics of the SAP is crucial to its application. The following work focused on the use of AT-O3S polymer, a Sodium salt of crosslinked polyacrylic acid purchased from Emerging Technologies®. The polymer had a particle size of 35 to 60 meshes, or 250 to 500 microns. The swelling and deswelling ratio of such a polymer is heavily influenced by salinity, temperature, and pH. In order to study the polymer’s kinetics, 1% (for swelling) or 0.1% (for deswelling) by solution weight of polymer was allowed to swell and deswell over time in various brines. These brines were made up of deionized water, 1% to 20% (by wt.) Sodium Chloride, and/or 1% to 10% (by wt.) Calcium Chloride. The effect of temperature on the final swelling ratio was afterwards tested. Understanding the reaction of SAPs to conditions similar to those found in an oil formation can help the oil industry to utilize this tool with greater efficiency.

scholarly journals Optimization Technique and Practice of Stratified Injection in Low and Medium Permeability Thin Interlayer Reservoirs

2021 ◽  
Vol 8 (5) ◽  
pp. 8-11
Author(s):  
Fen He ◽  
Tao Li ◽  
Yang Li
Keyword(s):  
Recovery Rate ◽  
Optimization Technique ◽  
Water Injection ◽  
Low Permeability ◽  
Longitudinal Splitting ◽  
Research Technology ◽  
Medium Permeability ◽  
Thin Interlayer ◽  
Injection Effect ◽  
The Impact

Reservoir S is a typical medium and low permeability thin interlayer reservoir. It is developed by co-production of directional Wells and separate injection of directional Wells. The comprehensive water content of the oilfield is 54%. Therefore, it is urgent to optimize the injection method of stratified injection distribution in this reservoir, so as to improve the degree of water driving and recovery. In this paper, the reservoir engineering and numerical simulation methods are adopted to introduce the impact factor of injection-production correspondence rate, modify the previously used fine injection matching model, and use the model to quantitatively analyze the sensitivity of key parameters such as longitudinal splitting coefficient, pressure recovery rate and injection-production correspondence rate. The results show that it is very important to select the influencing factors for the injection and production response ratio of medium and low permeability thin interlayer reservoirs, which directly affects the effect of stratified water injection. At present, this research technology has been widely applied in S oilfield, and the water injection effect is very significant, effectively improving the recovery rate of the implementation area by 2%, which provides experience for the water injection development of similar reservoirs.

Factors affecting water injection in the ultra-low permeability sandstone oil reservoirs

2021 ◽  
Author(s):  
Xuefen Liu ◽  
Fei Chen ◽  
Hongwu Xu ◽  
Yazhou Li ◽  
Siyang Wang ◽  
...  
Keyword(s):  
Water Injection ◽  
Oil Reservoirs ◽  
Low Permeability ◽  
Factors Affecting

Modeling of filtration processes in periodic porous media

2021 ◽  
pp. 90-93
Author(s):  
Gennadiy Sandrakov ◽  
Andrii Hulianytskyi ◽  
Vladimir Semenov
Keyword(s):  
Porous Media ◽  
Parabolic Equations ◽  
Initial Boundary ◽  
Dynamic Processes ◽  
Low Permeability ◽  
Initial Boundary Value Problems ◽  
High Permeability ◽  
Guaranteed Accuracy ◽  
The Media ◽  
Initial Boundary Value

Modeling of dynamic processes of diffusion and filtration of liquids in porous media are discussed. The media are formed by a large number of blocks with low permeability, and separated by a connected system of faults with high permeability. The modeling is based on solving initial boundary value problems for parabolic equations of diffusion and filtration in porous media. The structure of the media leads to the dependence of the equations on a small parameter. Assertions on the solvability and regularity of such problems and the corresponding homogenized convolution problems are considered. The statements are actual for the numerical solution of this problem with guaranteed accuracy that is necessary to model the considered processes.

A Novel Coreflood Test to Evaluate EOR Potential of Wettability-Altering Surfactants in Oil-Wet Heterogeneous Carbonate Reservoirs

2021 ◽  
Author(s):  
Yue Shi ◽  
Kishore Mohanty ◽  
Manmath Panda
Keyword(s):  
Oil Recovery ◽  
Carbonate Reservoirs ◽  
Wettability Alteration ◽  
Low Permeability ◽  
High Permeability ◽  
Matrix Permeability ◽  
Rock Heterogeneity ◽  
The Matrix ◽  
Flow Through ◽  
Main Factors

Abstract Oil-wetness and heterogeneity (i.e., existence of low and high permeability regions) are two main factors that result in low oil recovery by waterflood in carbonate reservoirs. The injected water is likely to flow through high permeability regions and bypass the oil in low permeability matrix. In this study, systematic coreflood tests were carried out in both "homogeneous" cores and "heterogeneous" cores. The heterogeneous coreflood test was proposed to model the heterogeneity of carbonate reservoirs, bypassing in low-permeability matrix during waterfloods, and dynamic imbibition of surfactant into the low-permeability matrix. The results of homogeneous coreflood tests showed that both secondary-waterflood and secondary-surfactant flood can achieve high oil recovery (>50%) from relatively homogenous cores. A shut-in phase after the surfactant injection resulted in an additional oil recovery, which suggests enough time should be allowed while using surfactants for wettability alteration. The core with a higher extent of heterogeneity produced lower oil recovery to waterflood in the coreflood tests. Final oil recovery from the matrix depends on matrix permeability as well as the rock heterogeneity. The results of heterogeneous coreflood tests showed that a slow surfactant injection (dynamic imbibition) can significantly improve the oil recovery if the oil-wet reservoir is not well-swept.

The Research and Evaluation of Finely Layered Water Injection Standard in Low-Permeability Reservoirs - A Case from Block A in one Low-Permeability Reservoir

2014 ◽  
Vol 1073-1076 ◽  
pp. 2310-2315 ◽  
Author(s):  
Ming Xian Wang ◽  
Wan Jing Luo ◽  
Jie Ding
Keyword(s):  
Oil Recovery ◽  
Water Injection ◽  
Injection Pressure ◽  
Injection Rate ◽  
Low Permeability ◽  
Reservoir Permeability ◽  
Engineering Parameters ◽  
The Common ◽  
Common Problems ◽  
Low Permeability Reservoirs

Due to the common problems of waterflood in low-permeability reservoirs, the reasearch of finely layered water injection is carried out. This paper established the finely layered water injection standard in low-permeability reservoirs and analysed the sensitivity of engineering parameters as well as evaluated the effect of the finely layered water injection standard in Block A with the semi-quantitative to quantitative method. The results show that: according to the finely layered water injection standard, it can be divided into three types: layered water injection between the layers, layered water injection in inner layer, layered water injection between fracture segment and no-fracture segment. Under the guidance of the standard, it sloved the problem of uneven absorption profile in Block A in some degree and could improve the oil recovery by 3.5%. The sensitivity analysis shows that good performance of finely layered water injection in Block A requires the reservoir permeability ratio should be less than 10, the perforation thickness should not exceed 10 m, the amount of layered injection layers should be less than 3, the surface injection pressure should be below 14 MPa and the injection rate shuold be controlled at about 35 m3/d.

scholarly journals The possibility of the application of the zeolyte powders for the construction of the membranes for the carbon dioxide separation

2015 ◽  
Vol 21 (2) ◽  
pp. 277-284
Author(s):  
Dragutin Nedeljkovic ◽  
Marija Stevanovic ◽  
Mirko Stijepovic ◽  
Aleksandar Stajcic ◽  
Aleksandar Grujic ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Diffusion Mechanism ◽  
Composite Membranes ◽  
Polymer Chains ◽  
Mixed Matrix Membrane ◽  
Low Permeability ◽  
High Permeability ◽  
Mixed Matrix ◽  
Carbon Dioxide Separation ◽  
Inorganic Particles

The task of this work was to construct the mixed matrix membrane based on polymer that could be used for the treatment of the waste gases. Therefore, high permeability for the carbon dioxide and low permeability for other gases commonly present in the industrial combustion waste gases (nitrogen, oxygen, hydrogen, methane) are essential. Those membranes belong to the group of dense composite membranes, and mechanism for separation is based on the solution-diffusion mechanism. In this paper, feasibility of the application of poly(ethyleneoxid)-copoly(phtalamide) was tested. In order to enchase the permeability of carbon dioxide, three different zeolites were incorporated, and in order to improve compatibility between the inorganic particles and polymer chains, n-tetradecyldimethylamonium bromide (NTAB).was added. Three zeolites were with the 2-dimensional pores (IHW, NSI and TER). The best results in carbon dioxide/hydrogen selectivity were obtained with the membrane constructed with PEBAX 1657 and surface treated zeolites, while the better results concerning selectivity were gained with membranes based on the Polyactive.

Sign in / Sign up

Export Citation Format

Share Document