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Development of oil field injection well scaling Analysis and Prevention


15m3 for cleaning. After injection of detergents,[link widoczny dla zalogowanych], shut response 2h, back flushing of residual acid and scale in exclusion. When the back drain pn> 5, the end of the construction, start a normal injection. January 2000 ,6-603 injection wells for the first time the scaling of successful experiment by subsequent 3-182 and 5-11 well and other wells 20 carbonate scale water injection wells were blocked by injection cleaning step-down experiments have achieved varying degrees of pressure and increase the effect of injection. Water reduced by an average starting pressure 2.78MPa, water absorption index rose by an average 4.1m3/MPa, the average lower injection pressure 4.6MPa, increasing the average single well injection of water 735m3, the average period of 91d, effectively supplement the formation energy. Corresponding to 37 wells, 23 oil wells to meet the increasing effect, the cumulative increase in liquid 1.35xlo4m3, cumulative oil 2988.5t. 2.2 Well pump oil anti-scaling technology Pucheng wells is 27.7% of the pump wells. General pump wells into production within six months, the body,[link widoczny dla zalogowanych], into the liquid outlet, the impeller spline bushing link Department, screens, and other parts to serious fouling shot hole, causing the pump card, stop sampling and analysis showed that the carbonate content in the scale by 68 .8%. A typical 7-2o wells in January 1999 to begin production under the pump, using the 100m3 unit, daily fluid production 41.6m3, daily oil production l6lt, pump displacement efficiency of 50.3%, fluid level 1155m, six months were found inside the pump three times, the average operating cycle 56d. Pump inspection found that the multi-stage impeller pump scaling serious and cause for the unbalanced schedule, affecting pump efficiency improved. 7-20 wells pH 5.5 ~ 7.5, is the use of disodium EDTA in chelating the metal ion cleaning of the ideal conditions for the reaction. In order to achieve good cleaning results, the pump from the displacement of 10 (hn3 to 50, and then implement measures to prevent cleaning measures after the implementation of Jing ,[link widoczny dla zalogowanych], a remarkable improvement in the work of the pump, pump current stability, the current card into a smooth curve, daily fluid production up to 558m3, daily oil production rose to 2o.1t, increased the efficiency of the pump displacement to ll1.6 %, fluid level 1387m. Currently, the wells have been normal production 240d, the cumulative increase of crude oil 960t. In addition, 3-358,7-15,90-21 wells 7 wells to take anti-scaling technology, the cumulative oil 7742t2.3 injection well scaling properties of organic phosphorus and inorganic phosphate of Taiwan, compared with the chemical stability, hard to be hydrolyzed and advantages of low consumption. ATMP is a typical scale inhibitor organophosphorus compounds on carbonate scaling a good inhibitory effect. For Pu city block formation of individual injection well bore and severe scaling,[link widoczny dla zalogowanych], resulting in water elevated pressure conditions, design and installation of the injected water filters, and regularly add 5 ~ 10mg / L of ATIgP, six months, no further increase in injection pressure, filters the sediment is also minimized. the pilot in two phases. The first phase of a continuous dosing two months, each day ATNP Pharmacy 25kg, dosing concentration of lOmg / L; the second phase of extension of dosing time in the case of gradually reducing the dosage, pharmacy each day ATNP 5kg, plus drug concentration of 5mg / L. while in the water hanging on the trunk patch test to measure fouling rate of speed and scale control. According to the statistics of the 8El well test data show that the average normal injection pump reduces the pressure 3.5MPa, scaling rate increased 65.5%, scale speed from 5.4g / (m2 ・ d) reduced to 0.15e. / (m2-d). 2.4 Pucheng elevated oil collection tank scaling well as some scattered away from the remote metering station and other reasons to be temporary storage tank will be produced fluid. To facilitate drainage, electric heaters installed inside the tank. In general, electric heaters use 2-3 months after a serious scale, the heat can not be rapid dissemination, and so many accidents caused by fire, affecting production, resulting in losses. from regularly joining 3-4me ~ / L of ATMP scale inhibitor,[link widoczny dla zalogowanych], the effective control of the scale, and did not cause an accident. 3 Conclusion and understanding Pucheng Oilfield chemical scale control, cleaning measures to increase production by injection technology with high economic and social benefits, the input-output ratio of l: 7.45 main features is the use of safe, low-corrosive, no secondary precipitation; In dealing with the wellbore, formation time scale has a unique role; in dealing with ground equipment or the time scale gathering lines, no damage to the workpiece on the scale, labor intensity of small-scale removal cleaning process is the step-down injection wells by injection of conventional acidification alternative processes, acidification with the traditional measures, compared with the provincial workers, save time, expense and other provincial features, applications should be promoted. References: 1 Zhao Fulin Bian adopted by the use of agents, Dongying: Petroleum University Press. 1997 Edit this high rock
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