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This paper puts forward a new method to screen scale inhibitors. It's an improvement to the traditional method of solid suspended objects measurement named Filter Membrane Filtration Method. The material which is extracted via filter membrane<0. 45 µm is defined as suspended scale, and the material which attaches to the surface of conical flask is defined as sedimentation scale. The content of the sum of suspended scale and sedimentation scale is called total scale quantity. We create a new method to evaluate and select scale inhibitors via measuring the change of scale in quality, observing the change of scale in morphology by polarizing microscope and scanning electron microscope, and analyzing component of scale by X-ray diffraction and energy spectrum analysis. Compared with industrial standard, this new method can estimate scale inhibitors performance so handy, quickly, effectively and reliably that we think it have the value of popularization in the oilfield. [ABSTRACT FROM AUTHOR]

Suspended solid is the main control index of oilfield injection water, the exceeded suspended solids can easily block the leakage end face and seepage pores of injection wells, which pause water injection pressure increasing and injection rate declining, in a word, the effect of water injection is worse. Through the rock ore analysis to analyze the QK 17-2 oilfield water injection suspended solids, and put forward the solution to high suspended solid content and control measures of removing the blockage. Study shows that suspended solids content increases by 1. 8 or 5. 1 mg/L after the injection of fresh water and sewage water, the main reason is that fresh water and sewage water is not compatible, and the process is dirty. By the addition of 30mg/L antiscale 95% ATMP, the concentration of Ca2+, Mg2+ in the mixing water samples as well as he increase of suspended solids can be inhibited, installation of filter at the wellhead can further stabilize the quality of injection water. The main components of suspended solids in injection water are corrosion products of iron-sulfur compounds and formation mineral based on silicon and aluminum, which contain a small amount of calcium and magnesium-based carbonate, the main particle size is from 5µ to 15µ. By strengthening the acidification efforts of iron-sulfur compounds and increasing the dosage of hydrochloric acid pre-liquid, the blockages can be dissolved well and the water injection effect can be improved. [ABSTRACT FROM AUTHOR]