Underground filter capable of being thrown-in and pulled for water injection well

• Main Authors: WANG WEI, YAO BIN, HU GAIXING, YANG LINGZHI, HE RUXIAN, LU XIAOBING, SHEN XIAOLI, WANG SHOUHU, WANG XIAO'E, CHEN LIHAI, WANG JUNTAO
• Format: Patent
• Language: Chinese; English
• Published: 24.05.2017
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention relates to the technical field of water-injection matching tools of oil fields, in particular to an underground filter capable of being thrown-in and pulled for a water injection well. The underground filter capable of being thrown-in and pulled comprises a fishing head, wherein the lower end of the fishing head is sequentially connected with a filter base, a filter barrel and a choke plug from top to bottom; a liquid inlet is formed in the upper end of the filter base; the lower end of the filter base communicates with the filter barrel; the filter barrel is in the shape of a circular barrel, and is composed of an inner coarse filter screen and an outer fine filter screen which are arranged from inside to outside in a sleeved mode; a transverse coarse filter screen is further arranged in a hollow cavity in the lower end of the inner coarse filter screen; and a filter material is arranged on the lower part of the transverse coarse filter screen. A method of adding the filter material and perform