Sand-blocking-preventing oil-extraction production tubular column

A technology for producing pipe strings and production pipes, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of pipe string stuck, oil well overhaul, immobility, etc., and achieves a simple structure of pipe string. Effect

CN102383764AInactive Publication Date: 2012-03-21DAGANG OIL FIELD GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-03-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a sand-blocking-preventing oil-extraction production tubular column, aiming at overcoming the defects that in the existing oil-extraction production tubular column can not be lifted after being blocked by sand and is difficult to deblock so as to cause overhauling of the oil well and the like. The sand-blocking-preventing oil-extraction production tubular column is characterized in that a sealing tube, a hollow bridge plug and a release of a hollow release tubular column are fixedly connected in sequence from bottom to top; the hollow release tubular column is positioned between a production layer and a control layer; the hollow bridge plug is set and is clamped on a sleeve wall; a plug, a screening tube, a core tube, a safety joint, a pressure-difference type safety valve, a release device, a self-sealing-examining packer, a pressure-difference type oil sleeve communicating valve, an oil pump and an oil tube of a plug-in type oil-extraction tubular column are fixedly connected in sequence from bottom to top; the core tube penetrates through the sealing tube of the hollow release tubular column, and a radial sealing device is arranged between the core tube and the sealing tube; the screening tube connected at the lower end of the core tube is positioned on the production layer; and the self-sealing-examining packer is positioned above the control layer. The sand-blocking-preventing oil-extraction production tubular column has the beneficial effects of having simple and convenient structure, not only meeting the production needs, but also being beneficial to deblocking of the tubular column and the later-stage tubular column measure treatment.
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Description

Technical field

[0001] The invention relates to an oil recovery production string, in particular to an oil recovery production string for sand prevention. Background technique

[0002] With the continuous deepening of oilfield development, the formation is more and more complex, and the difference between layers is large. The joint production can no longer meet the production demand. Mechanical layered mining has become the most effective technical means to tap the potential of the interlayer.

[0003] At present, the mechanical separation production string commonly used in oilfields has poor adaptability in sand production wells due to the imperfect structure of the process string, and the stuck packer is often buried in the sand production layer, and the string is stuck when the pump is checked. If it is dead but unable to lift, it will lead to overhaul of the oil well and increase the operating cost. In order to solve this problem, when the separate production string is ...

Examples

no. 1 example

[0012] The first embodiment of the present invention is: the oil recovery production string for sand prevention includes a hollow throw-away string 20 and a plug-in oil recovery string 18 . The hollow drop string 20 is composed of a sealing tube 11, a hollow bridge plug 9, and a drop 8 which are sequentially fixedly connected from bottom to top. Plug 13, screen pipe 12, core pipe 10, safety joint 7, differential pressure normally open valve 6, release device 5, self-inspection seal packer 4, differential pressure oil sleeve connecting valve of plug-in production string 18 3. Oil well pump 2 and oil pipe 1 are fixedly connected sequentially from bottom to top.

[0013] The second embodiment of the present invention is: the oil recovery production string for preventing sand jam includes a hollow hands-off string 20 and a hands-off oil production string 19 . The hollow drop string 20 is composed of a sealing tube 11, a hollow bridge plug 9, and a drop 8 which are sequentially fi...