Sand production in oil and gas Wells has always been a headache in the process of exploitation of loose sandstone reservoirs. The existing sand control technology and tools can not solve the need of sand control in the middle and late stage of serious sand production and fine sand Wells.High sand control costs, short life and low recovery rates have been a problem for field developers. In order to effectively prevent and control the sand production of oil and gas Wells, the oil producing countries are stepping up research on this problem.
In view of the problems such as rectangle seam screen is easy to produce sand blockage, trapezoidal seam screen is easy to be worn and enlarged, which affects the sand control effect and service life, a new type of composite cavity slotted screen is developed by using the theory and latest research results of fluid mechanics and mechanical sand control technology.By using fluid simulation software, the flow resistance of rectangular joint, trapezoidal joint and new composite joint under different conditions is analyzed, and the corresponding law relationship is summarized.The structure shape of the new composite joint cavity is optimized. The new joint has the advantages of low flow resistance and strong anti-wear ability. The corresponding slotted screens have been popularized and applied in Shengli and Zhongyuan oil fields, and good sand control technology results have been obtained.
The corrosion resistance of the slit surface has a great impact on the sand control effect and the service life of the screen. Many technicians mainly use the corrosion theory of oil casing to evaluate the corrosion resistance of the slit, because the physical and chemical properties of the slit surface usually change greatly after cutting.So the evaluation results often have a large deviation.To solve this problem, it is necessary for technicians to find out the corresponding process law relationship and improve the corrosion resistance of the slotted surface.
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