发明名称 |
Reciprocating rod type downhole pump |
摘要 |
There is disclosed a reciprocating rod type downhole pump for an oil well wherein a filter on the lower end of the barrel of the pump includes a solid body of filtering media having small tortuous passageways connecting its inner and outer sides and decreasing in size from its outer to its inner side.
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申请公布号 |
US4969518(A) |
申请公布日期 |
1990.11.13 |
申请号 |
US19900463166 |
申请日期 |
1990.01.10 |
申请人 |
STREN COMPANY |
发明人 |
SCHMITT, KENNETH J.;WILSON, GUY E. |
分类号 |
E21B43/08;E21B43/12;F04B47/02 |
主分类号 |
E21B43/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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