Multi-layer multi-size fraction composite prefilling sieve tube suitable for sand prevention of silty-fine sand

• Main Authors: LIU YONGHONG, XU HONGZHI, WANG YUBIN, ZHONG YIXIN, DONG CHANGYIN, LI ZHIFEN, ZHOU YUGANG, YAN QIEHAI
• Format: Patent
• Language: Chinese; English
• Published: 28.08.2018
• 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

The invention relates to a multi-layer multi-size fraction composite prefilling sieve tube suitable for sand prevention of silty-fine sand. The multi-size fraction composite prefilling sieve tube suitable for the sand prevention of the silty-fine sand comprises a base tube, an internal wire winding layer, a multi-size fraction composite filling layer, an external wire winding layer and an externalprotection cover in sequence from inside to outside, wherein the outer surface of the base tube is sleeved with the internal wire winding layer, the outer portion of the internal wire winding layer is sleeved with the multi-size fraction composite filling layer, the multi-size fraction composite filling layer is composed of three layers, gravels fill the gaps between the layers, the thickness ofeach layer is different from that of other layers, and the grain sizes of the gravels of different gaps between different layers are different; the outer portion of the multi-size fraction composite filling layer is sleeved wi