FILTER FOR WATER INJECTION INTO WELLS Russian patent published in 2015 - IPC B01D29/11 E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to devices for filtration of liquid injected into wells. The filter contains rigidly and tightly interconnected sections from filtering elements joined by end faces with an axial pre-load cylindrical thin-walled and two supports on which also with axial pre-load the first and the last filtering section elements. The filtering elements of each section are made of mesh layers weaved the wire spirals stretched up to the pitch equal to the spiral diameter. The mesh layers weaved from the right twist spirals alternate with the layers weaved from the left twist spirals. Axes of spirals of all layers are parallel to the filtering element axis. The filtering elements are implemented in three modifications: the filtering elements with one flat end face and another conic one and the intermediate filtering elements with different conic end faces. Outside of each section the spiral compression spring is installed. The spring length is selected so that at each assembled section during working process between the filtering elements and the section supports the axial pre-load remains. The section of filtering elements is aligned in supports. Springs are aligned by fillets of support. Section supports are made with a partition where the through central hole and three or four throatings, equally spaced along a circle are made. The first support of the first section of the filter is made with a shank with a thread, where against the stop into a sealing gasket an intermediate spacer with the stud bolts screwed in it for fastening to a submersible pump. The hollow cylindrical rod with through holes is rigidly fixed in the intermediate spacer of the first section.

EFFECT: filter capacity increase.

2 cl, 5 dwg