US 2013/0153796 A1Published application

Underground Annular Blowout Preventer and Assembly Process Thereof

AssigneeSouthwest Petroleum University

InventorsQingyou Liu, Wei Li

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Abstract

An underground annular blowout preventer, which belongs to the technical field of underground blowout prevention, includes an upper joint and a lower joint are sleeved outside a central barrel. The lower end of the central barrel is fixedly connected with the lower joint. The lower end of the upper joint is sleeved on the inner side of the upper end of the lower joint. The upper joint is matched with the lower joint through a spline. The lower end of the upper joint can freely move relative to the lower joint along a spline pair. At least one rubber barrel is sleeved on the outer side of the upper joint. The rubber barrel can be extruded and expanded by the upper joint and the lower joint. The underground annular blowout preventer of the present invention can transmit large torque, has a simple structure, long service life, is convenient to use, and can be repeatedly used. The underground annular blowout preventer is used in coordination with a check valve of a near drill in the well drilling process, so that quick sealing of a well can be ensured, and well blowout accidents can be effectively prevented. A pipe column is lowered to seal the well and is lifted to open the well, and the inside of the drill rod is in communication with an annular space after the well is sealed, which facilitates replacement for heavy mud lubrication operations.

Claims9

Dependent claims

An underground annular blowout preventer, comprising an upper joint, a lower joint, a central barrel, and a rubber barrel, wherein said upper joint and said lower joint are sleeved outside said central barrel, wherein the lower end of said central barrel is fixedly connected with said lower joint, wherein the lower end of said upper joint is sleeved on the inner side of the upper end of said lower joint, wherein said upper joint is matched with said lower joint through a spline, wherein at least one rubber barrel is sleeved on the outer side of said upper joint and said rubber barrel can be extruded and expanded by said upper joint and said lower joint;

a first flow guiding hole is set on said central barrel and a second flow guiding hole is set on said upper joint, a sealing member is set between inner wall of said upper joint and outer wall of said central barrel, periphery of said first flow guiding hole and periphery of said second flow guiding hole are sealed by said sealing member, and said first flow guiding hole and said second flow guiding hole are in butt joined with each other when said upper joint moves downwards, Is wherein a first check valve is set inside said first flow guiding hole, and/or a second check valve is set inside said second flow guiding hole, wherein a spring ejector is set on the inner side of the upper end of said upper joint, wherein outer side of said central barrel is close to said upper joint is provided with multiple moving grooves which are matched with said spring ejector, wherein the ejector on said spring ejector is in sliding cooperation with each of said moving grooves, wherein the inner wall of said central barrel is provided with an installation auxiliary hole.

An assembly method of an underground annular blowout preventer, comprising the following steps:

S701, fixing the inner sleeve, embedding multiple spacer rings and the rubber barrel outside of the inner sleeve along the thread direction at the upper end of the inner sleeve, such that said spacer rings and said rubber barrel are limited at the upper right side of the convex shoulder at the middle of said inner sleeve;
S702, embedding the thrust bearing inside the upper external sleeve from the lower end thereof, and fixedly connecting the lower end of said upper external sleeve and said upper end of said inner sleeve;
S703, embedding the first check valve and the second check valve separately on the side walls of the central barrel and said upper external sleeve and tightening to a predetermined torque, embedding the sealing member to the relevant position of said central barrel and mounting said central barrel from top of said upper external sleeve and said inner sleeve;
S704, embedding the lower joint to the outside of said central barrel and said inner sleeve, stretching the outward expanding tool to the inner side of said central barrel and blocking the tool in the installation auxiliary hole, and fixing said lower joint while rotating said central barrel, or fixing said central barrel while rotating said lower joint so as to tighten the thread pair between the lower end of said central barrel and said lower joint to the predetermined torque;
and
S705, embedding the spring ejector inside the upper connector, inserting said upper connector into said central barrel along the outer wall thereof, fixing said upper external sleeve while rotating said upper connector, or fixing said upper connector while rotating said upper external sleeve so as to tighten the thread pair between said upper connector and said upper external sleeve to the predetermined torque, such that the ejector on said spring ejector slides into the upper moving groove of said central barrel during the downward movement process of said upper connector.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/818,092Filed 21 Feb 2012
Priority: CN 201110138301.726 May 2011
Published: 20 Jun 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

E21B 33/06
Well heads; Setting-up thereof: blow-out preventers , i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
E21B 21/10
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor: valve arrangements in drilling-fluid circulation systems
E21B 33/10
Sealing or packing boreholes or wells: in the borehole
E21B 34/10
In wells: operated by control fluid supplied from outside the borehole

Family

US 9,206,662 B2Related patent
US 2013/0153796 A1This patent

From the US filing history. Foreign family members aren’t listed.

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