Casing packing joint sealing structure
A sealing structure and casing technology, which is applied in the direction of casing, drill pipe, drilling equipment, etc., can solve the problems of poor O-ring installation position stability, structural limitations, and poor pressure resistance, and achieve a simple double sealing structure, Reduce supporting costs, good sealing effect
Inactive Publication Date: 2013-05-08
JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD
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Problems solved by technology
Due to the small cross-sectional area of the O-ring, the groove for placing the O-ring is shallow. Although this superficial sealing structure is easy to manufacture, the stability of the O-ring installation position is poor, and the pressure resistance is poor, especially for casings. During loading and unloading, the O-ring will move along with it, and even roll over in the groove as a whole, which will easily cause the O-ring to be torn and become invalid.
In addition, this kind of superficial sealing structure is limited by the structure, and the specifications cannot be changed. Due to poor interchangeability, it will inevitably increase the supporting cost for users.
Method used
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Embodiment Construction
[0012] The present invention will be further described below according to the accompanying drawings and in conjunction with the embodiments.
[0013] figure 1 The sealing structure of the casing packing joint shown is set in the stepped inner hole of the large end face of the casing 5, and the upper pressure ring 1, the sealing ring 2, the lower pressure ring 3 and the clamping spring 4 are sequentially plugged from the inside to the outside. The sealing ring 2 is an oil-resistant rubber product, and its axial cross-section is rectangular, and the planes at both ends cooperate with the upper pressure ring 1 and the lower pressure ring 3 respectively to form a plane double-seal structure. The clamping spring 4 is embedded with the housing 5 to axially lock the lower pressure ring 3 to maintain the stability of the planar double-seal structure. The inner hole of the ring sealing ring 2 is provided with an arc groove, and the centered arc radius R is equal to the outer diameter ...
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The invention discloses a casing packing joint sealing structure. The sealing structure is arranged in a stepped inner hole with large end face and comprises an upper press ring, a sealing ring, a lower press ring and a fastening spring which are sequentially plugged from inside to outside. The sealing ring is an oil-resistant rubber product, the axial section of the sealing ring is shaped in a rectangle, and planes of two ends of the rectangle are matched with the upper press ring and the lower pressing ring respectively to form a planar double-sealing structure. An arc-shaped groove is arranged in an annular inner hole of the sealing ring, the center arc radius is equal to the outer diameter of a sleeve, and after mounting, inner convex curved surface structures of two sides of the sealing ring and elastic deformation of the outer wall of a casing form two radial sealing structures. During practical mounting, the sealing ring is axially clamped between the upper press ring and the lower press ring, the casing is inserted and mounted without changing mounting position of the sealing ring, and excellent sealing effect is always kept.
Description
technical field [0001] The invention relates to a pipeline sealing structure for oil wells, in particular, the invention relates to a casing sealing joint sealing structure for oil wells. Background technique [0002] The sealing structure of the traditional casing packing joint is a simple sealing structure composed of double O-rings, supplemented by a grease seal. The sealing structure is simple, easy to install, and can meet the sealing requirements. Due to the small cross-sectional area of the O-ring, the groove for placing the O-ring is shallow. Although this superficial sealing structure is easy to manufacture, the stability of the O-ring installation position is poor, and the pressure resistance is poor, especially for casings. During loading and unloading, the O-ring seals move along with it, and even roll over in the groove as a whole, which will easily cause the O-rings to be torn off and become invalid. In addition, this kind of superficial sealing structure is...
Claims
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IPC IPC(8): E21B17/08
Inventor 蒋家华张希平马吉山
Owner JIANGSU SHUGUANG OIL DRILLING EQUIP CO LTD