Christmas tree device suitable for permanent suspension coiled tubing production
A technology for a Christmas tree and an oil pipe, applied in the field of the Christmas tree device, can solve the problems of unreliable sealing of the coiled tubing, hindering the realization of the functions of the main valve and the wax cleaning valve of the Christmas tree, etc.
Active Publication Date: 2019-03-12
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
[0005] For downhole ultrasonic permanent tool plugging removal, small-diameter pipe drainage and gas production, and coiled tubing fishing electric pump operations, it is necessary to hang coiled tubing at the wellhead for a long time for production. During the production process, the coiled tubing crosses the oil production channel and hinders the main valve of the conventional Christmas tree. and the function of the wax removal valve are realized, and there are problems of long-term suspension of the coiled tubing suspension wellhead and unreliable sealing
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[0017] In order to make the technical solution of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The specific embodiment of the present invention is as follows.
[0018] As shown in the accompanying drawings, the suspended coiled tubing production Christmas tree device of the present invention includes a Christmas tree body 5 with a stepped through hole in the middle, and the stepped through hole has two steps, including the upper part arranged in sequence from top to bottom The through hole, the middle through hole and the lower through hole, the diameters of the upper through hole, the middle through hole and the lower through hole decrease in order. A Christmas tree cap 3 is fixed on the top of the Christmas tree body 5 by bolts, and a mounting hole is opened in the middle of the Christmas tree cap 3 .
[0019] The bottom wall of a top plug upper body 12-1 with a U-shaped longitu...
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The invention discloses a christmas tree device suitable for permanent suspension coiled tubing production. The device comprises a christmas tree body, a side hole is formed in the middle of the bodyand externally connected with a main valve and wing valve combination device, a large-drift-diameter tubing hanger is suspended in the body, and a side hole of the large-drift-diameter tubing hanger is communicated with the side hole of the body; the upper portion of the middle of the body is provided with a top plugging device, the top plugging device is locked by a locking block, the lower portion of the top plugging device is connected with a coiled tubing suspension sealing device, the top of the christmas tree body is provided with a christmas tree cap to ensure top sealing and protection, and a coiled tubing penetrates out of a middle hole of the christmas tree cap. The normal production after the coiled tubing is suspended is ensured through the christmas tree body and the side holeof the large-drift-diameter tubing hanger, inner and outer multi-layer sealing structures of the top plugging device meet the sealing requirements of the production process, and the coiled tubing suspension sealing device ensures the suspension stability and sealing reliability of the coiled tubing.
Description
technical field [0001] The invention relates to a Christmas tree device, in particular to a Christmas tree device suitable for the production of permanently suspended coiled tubing. Background technique [0002] Coiled tubing, as an important tool in oilfield production, has been widely used in oilfield sidetracking, testing, workover, oil and gas production, etc., among which, in the downhole Coiled tubing on the well rig platform, electric pumps, etc. need to be permanently suspended at the wellhead. [0003] The main means of operation of platforms without workover rigs is to implement workover by relocation of workover ships, drilling ships or workover rigs. The relocation of workover ships, drilling ships and workover rigs for pump inspection on platforms without workover rigs has high risks. Frequent relocation of workover rigs requires long preparation time, high cost, and high equipment loss. The lifting and lowering of the pipe string often causes the performance d...
Claims
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Login to View More IPC IPC(8): E21B33/04
CPCE21B33/04E21B33/0422
Inventor 崔国亮李登祖健郭雯霖田发超李康刘全刚朱橙
Owner CHINA NAT OFFSHORE OIL CORP