| 摘要 |
FIELD: oil and gas production. ^ SUBSTANCE: expandable well filter consists of bearing pipe expanded with expandable cone and equipped with slots. The bearing pipe is solid, while slots are cut as cross slits arranged in rows along axis of the bearing pipe. On top the bearing pipe is equipped with an anchor in form of a lengthwise corrugated pipe with expandable cone pressure tight secured on top. The cone is connected with a string and is equipped with a fishing tool. An extractable relief valve with a fishing head on top for the fishing tool is installed inside between the bearing pipe and the anchor. ^ EFFECT: increased service life of filter, reduced material expenditures for fabrication. ^ 3 dwg |
