Study on Environment Friendly Descaling and Formation Unblocking Technique for Injection Wells

Corrosion and scale formation of near well-bore zone are common reasons that affect the effectiveness of injection wells. Although conventional stimulation treatments can remove the blockage, many disadvantages occur such as short-term effectiveness, long occupation period, large amount of waste fluid, big environmental impact and limited transportation procurement. In this paper, an environment friendly descaling and formation unblocking technique was found which includes two kinds of treatments. One is called neutral descaling, anti-swelling, liquid circulation cleaning technique(NALC) and the other is called slow release anti-scaling solid acid treatment(SASA). The environment impacts of well stimulation treatments are significantly reduced which would meet the requirements of the “Green Mine” needs.

Download Full-text

A New Method of Fall-Off Test in Water Injection Well in Tahe Oilfield

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.807-809.2508 ◽

2013 ◽

Vol 807-809 ◽

pp. 2508-2513

Author(s):

Qiang Wang ◽

Wan Long Huang ◽

Hai Min Xu

Keyword(s):

Water Injection ◽

Injection Well ◽

Well Test ◽

Well Bore ◽

Residual Oil ◽

Injection Wells ◽

Oil Saturation ◽

Tahe Oilfield ◽

Fitting Method ◽

Front Radius

In pressure drop well test of the clasolite water injection well of Tahe oilfield, through nonlinear automatic fitting method in the multi-complex reservoir mode for water injection wells, we got layer permeability, skin factor, well bore storage coefficient and flood front radius, and then we calculated the residual oil saturation distribution. Through the examples of the four wells of Tahe oilfield analyzed by our software, we found that the method is one of the most powerful analysis tools.

Download Full-text

Well stimulation features considering skin-factors as a means of productivity stabilization

Azerbaijan Oil Industry ◽

10.37474/0365-8554/2020-5-35-39 ◽

2020 ◽

pp. 35-39

Author(s):

T.Sh. Salavatov ◽

◽

M.A. Dadash-zade ◽

T.S. Babaeva ◽

◽

...

Keyword(s):

Acid Treatment ◽

Skin Effect ◽

Field Studies ◽

Major Purpose ◽

Skin Factor ◽

Well Stimulation ◽

Productivity Increase ◽

Additional Resistance ◽

Stimulation Method ◽

Scientific Practical

Numerous research surveys justified that the major purpose of well stimulation is the productivity increase by means of elimination of bottomhole damages in formation and well. This process appears directly by creating a certain structure in formation. Thus, in field conditions as a stimulation method the fracturing, acid treatment of reservoirs, as well as acid treatment of cracks (acid fracturing) are generally applied. Field studies showed that due to the radial nature of the flow the pressure decrease is basically occurs near the well and in the bottomhole. The analysis justifies that any damage in this area significantly increases the pressure reduction and the effect of such damages may be presented by means of “skin-factor”. The authors present more generalized concept of “skin factor” combining the most important aspects of bottomhole zone damages of production well. These processes create additional resistance decreasing production. From our perspective, the well stimulation is the productivity increase. In this case there is scientific-practical sense to consider the stimulation as a method for “skin-effect” value reduction. The paper offers a new parameter of “generalized skin-effect” or “generalized skin-factor” showing positive results with negative values, i.e. increases performance and productivity.

Download Full-text

Efficacy and Rate of Release of EPTC and Butylate from Starch Encapsulated Formulations Under Greenhouse Conditions

Weed Science ◽

10.1017/s0043174500064821 ◽

1978 ◽

Vol 26 (6) ◽

pp. 679-686 ◽

Cited By ~ 33

Author(s):

M. M. Schreiber ◽

B. S. Shasha ◽

M. A. Ross ◽

P. L. Orwick ◽

D. W. Edgecomb

Keyword(s):

Controlled Release ◽

Slow Release ◽

Residual Activity ◽

Biological Evaluation ◽

Soil Conditions ◽

Short Term ◽

Rapid Release ◽

Initial Release ◽

Wet Chemical ◽

Selection Of

Four starch-encapsulated formulations of EPTC(S-ethyl dipropylthiocarbamate) and of butylate(S-ethyl diisobutylthiocarbamate) were prepared and evaluated by comparison with their respective emulsifiable concentrate formulations for their slow-release capabilities and efficacies. Chemical and biological evaluation indicated that difference in controlled-release could be achieved by the selection of the starch xanthate and oxidant used in the formualtion process. EPTC and butylate released slower when formulated as starch-encapsulated granules than when formulated as emulsifiable concentrates under soil conditions that favored rapid release. The initial release was adequate for weed control and slow enough for desired residual activity. Repeated seeding and harvesting the treated soils and bioassays of treated soils generally produced release rate anticipated from short term dry and wet chemical tests.

Download Full-text

An efficient magnetic carbon-based solid acid treatment for corncob saccharification with high selectivity for xylose and enhanced enzymatic digestibility

Green Chemistry ◽

10.1039/c8gc02854k ◽

2019 ◽

Vol 21 (6) ◽

pp. 1292-1304 ◽

Cited By ~ 36

Author(s):

Wei Qi ◽

Guifeng Liu ◽

Chao He ◽

Shuna Liu ◽

Si Lu ◽

...

Keyword(s):

Acid Treatment ◽

High Selectivity ◽

Solid Acid ◽

Enzymatic Digestibility ◽

Magnetic Carbon ◽

Carbon Based

An efficient magnetic carbon-based solid acid treatment for corncob saccharification.

Download Full-text

Short-Term Well Testing to Determine Well bore Damage

Journal of Petroleum Technology ◽

10.2118/1464-pa ◽

1966 ◽

Vol 18 (10) ◽

pp. 1363-1370

Author(s):

L.R. Raymond ◽

J.L. Hudson

Keyword(s):

Well Testing ◽

Well Bore ◽

Short Term

Download Full-text

Environment-friendly short-term protection of palm wood against mould and rot fungi

Wood Material Science and Engineering ◽

10.1080/17480272.2014.981581 ◽

2014 ◽

Vol 11 (4) ◽

pp. 239-247 ◽

Cited By ~ 4

Author(s):

Mohsen Bahmani ◽

Olaf Schmidt ◽

Leila Fathi ◽

Arno Frühwald

Keyword(s):

Short Term ◽

Environment Friendly

Download Full-text

FeCl3–SiO2 as heterogeneous catalysts for the preparation of dihydropyrano[3,2-b]chromenediones

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc2011108 ◽

2011 ◽

Vol 76 (12) ◽

pp. 1791-1797 ◽

Cited By ~ 9

Author(s):

Wei-Lin Li ◽

Jin-Ying Liang ◽

Tian-Bao Wang ◽

Ya-Qin Yang

Keyword(s):

Heterogeneous Catalyst ◽

Heterogeneous Catalysts ◽

Solid Acid ◽

Kojic Acid ◽

Solid Acid Catalyst ◽

Acid Catalyst ◽

Environment Friendly ◽

Appreciable Change

FeCl3–SiO2 is environment-friendly heterogeneous catalyst for the condensation of kojic acid and aldehydes with dimedone to afford dihydropyrano[3,2-b]chromenediones. The solid acid catalyst is stable and can be easily recovered and reused without appreciable change in its efficiency.

Download Full-text

The Accounting Method of Agro-Ecological Compensation Standard of Environmental-Friendly Fertilizer in Erhai Watershed

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.600.47 ◽

2012 ◽

Vol 600 ◽

pp. 47-50

Author(s):

Feng Wang ◽

Ke Qiang Zhang ◽

Xi Yun Ni ◽

Huai Qin Yang ◽

Jun Yi Zhao

Keyword(s):

Opportunity Cost ◽

Slow Release ◽

Ecological Compensation ◽

Environment Friendly ◽

Integrated Method ◽

Ecosystem Services Value ◽

Net Profit ◽

Compensation Standard ◽

Ecological Construction ◽

Field Plots

In this paper, it reviewed the research the progress of the ecological compensation standard (ECS), and analyzed four main ECS accounting methods, including ecosystem services value, ecological construction cost, opportunity cost and willingness payment. Combined with paddy field plots experiment in Erhai watershed in China, it compared crop yield, fertilizer cost and net profit in the traditional fertilization method and slow-release fertilizer (SRF) technology. Compensation standard of the environment-friendly fertilizer was recommended as 750～1,500 yuan/hm2 in the area. After comparing different accounting processes, a integrated method which use the opportunity cost as a basis, together with farmer’s willingness and payment ability from government, is reliable to account agro-ecological compensation standard in China.

Download Full-text