Inverse squeezing tie-back sealing plug
A sealing plug and oil well cementing technology, which is applied in the field of oil well drilling and cementing, and achieves the effects of strong economic benefits, simple structure and convenient construction.
Active Publication Date: 2012-08-22
ANTON OILFIELD SERVICES (GRP) LTD
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Problems solved by technology
[0004] In order to overcome the problems of long cementing time and high cost in the prior art to solve oil well leakage, the present invention provides a back squeeze back for oil well cementing Connecting the sealing plug can not only realize the positive circulation cementing operation when the liner hanger fails, but also perform the annulus reverse extrusion cementing operation when the liner cementing cementing leakage occurs
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[0011] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0012] see figure 1 , the present invention is a back-extrusion tie-back sealing plug for oil well cementing, including a back-extrusion joint 1, a reducing nipple 2, and a tie-back plug 3, and the reducing nipple 2 connects the back-extrusion joint 1 and the tie-back plug 3 Get up; the reverse extrusion joint 1 is provided with a through hole 4; the tie-back plug is provided with a sealing groove 5, and an O-shaped sealing ring is arranged in the sealing groove.
[0013] The specific implementation mode of the present invention divides two kinds of situations:
[0014] 1. When there is no leakage in the well and the liner hanger fails, if the seal of the tie-back device fails, unscrew the back-extrusion joint, and insert the rest of the plug into the tie-back barrel of the liner hanger to realize tie-back and seal...
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The invention relates to the technical field of oil well drilling and cementing, in particular to a backward extrusion tied-back sealing plug used for oil well cementing. To overcome the problems of long well cementing time and high cost produced by oil well leakage in the prior art, the invention provides a backward extrusion tied-back sealing plug used for oil well cementing which comprises a backward extrusion plug, a tapered sub and a tied-back plug; the tapered sub connects the backward extrusion plug and the tied-back plug; the backward extrusion plug is provided with a through hole; the tied-back plug is provided with a seal groove; the seal groove is provided with an O-shaped gasket. The invention realize two processes with one device, i.e. the invention can be taken as a remedialmeasure after the cement injected into a stern tube for well cementing is leaked for backward extrusion of the cement so as to cement the leakage wells; and when a tail tube hanger fails to work, thebackward extrusion plug can be taken out to realize the positive circulation cement injection process; in addition, the plug has simple structure, is convenient in construction and has very good economic benefit.
Description
technical field [0001] The invention relates to the technical field of oil well drilling and cementing, in particular to an anti-squeeze back joint sealing plug for oil well cementing. Background technique [0002] In the process of exploration and development of oil and gas fields, one of the biggest problems often encountered is the problem of downhole leakage. When the leakage well is cemented, if the technical measures are not appropriate, cement slurry leakage will occur during the cementing construction process, causing the cement slurry to return to low level. If the geological engineering requirements are not met, the oil, gas, and water layers cannot be effectively isolated, and the interlayer fluids can flow into each other, making it impossible to carry out normal oil and gas extraction and acid fracturing and other production stimulation measures. What is more serious is that a large amount of cement slurry enters the production layer, which will block (or perma...
Claims
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IPC IPC(8): E21B33/13
Inventor 曹雪洪陈蔚鸿
Owner ANTON OILFIELD SERVICES (GRP) LTD