Oil field wellhead blowout prevention device
A blowout prevention device and oilfield technology, applied in wellbore/well parts, earthwork drilling, sealing/isolation, etc., can solve problems such as inability to meet long-term high-temperature use requirements, inability to install valve prevention devices, and lower downhole temperature , achieve reliable performance, durably seal the wellhead, and reduce pressure load
Pending Publication Date: 2019-02-12
KARAMAY SHENGLI PLATEAU MACHINERY CO LTD
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Problems solved by technology
[0003] 1. Most of the seals are made of rubber materials, which cannot meet the requirements of long-term high temperature use
[0004] 2. When replacing the lower-level seals, valve-type protective devices cannot be installed below the seal box, which is an uncontrolled operation and poses a safety hazard
However, the killing fluid will reduce the downhole temperature, pollute the oil layer, and seriously affect the recovery rate
Method used
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Embodiment Construction
[0022] An oilfield wellhead blowout preventer, such as figure 1 , figure 2 As shown, the upper and lower sealing chambers are arranged in the sealing box fixedly connected on the wellhead, and the working cylinder 10 is connected with the working cylinder 10 through the screw thread in the seat hole at the lower end of the sealing box base 8, and the upper and lower sealing chambers are passed through the upper and lower sealing chambers of the sealing box. The lower sealing packing 4, 6 cooperates with the polished rod 1, and the upper and lower end marks 2, 9 are arranged on the polished rod 1. Standby plunger 13, wherein working plunger 11 diameters are greater than polished rod 1 diameter, working plunger 11 and spare plunger 13 cooperate with working cylinder 10, and connecting rod 12 diameters are equal to polished rod 1 diameter. The structure of the sealing box has a cylindrical lower sealing box with an assembly cavity, and its lower end is provided with a disc seal...
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The invention belongs to a wellhead blowout prevention device used for an rod oil-pumping well and particularly relates to an oil field wellhead blowout prevention device. An upper sealing cavity anda lower sealing cavity are formed in a sealing box fixedly connected to a wellhead, a working cylinder is connected into a seat hole in the lower end of a sealing box base through a thread, the interiors of the upper sealing cavity and the lower sealing cavity in the sealing box are matched with a polish rod through an upper sealing filler and a lower sealing filler, an upper end marker and a lower end marker are arranged on the polish rod, the lower end of the polish rod is connected with a working plunger, and the lower end of the working plunger is connected with a standby plunger through aconnecting rod, wherein the diameter of the working plunger is greater than that of the polish rod, the working plunger and the standby plunger are matched with the working cylinder, and the diameterof the connecting rod is equal to that of the polish rod. The oil field wellhead blowout prevention device is reasonable in structure and reliable in performance and can seal the wellhead enduringly,the pressure-bearing load of the upper stage of rubber packing is reduced, the upper stage of sealing piece can be replaced or a wellhead device can be overhauled in a controllable state, sewage-discharging emptying is avoided, and safe, efficient, environment-friendly and energy-saving production is achieved.
Description
technical field [0001] The invention relates to an oilfield wellhead blowout preventer, which belongs to a wellhead blowout preventer used in rod pumping wells, in particular to an oilfield wellhead blowout preventer. Background technique [0002] With the widespread application of steam flooding and other heavy oil recovery technologies, the formation temperature gradually increases after long-term steam injection, and the production well fluid temperature rises. And there are following problems in existing wellhead polished rod sealing box: [0003] 1. Most of the seals are made of rubber materials, which cannot meet the requirements of long-term high temperature use. [0004] 2. When replacing the lower-level seals, valve-like protective devices cannot be installed below the seal box, which is an uncontrolled operation and poses a safety hazard. [0005] 3. When replacing or overhauling the polished rod sealing box, in order to ensure safety, it is necessary to use the ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E21B33/06
CPCE21B33/06
Inventor 吕向升张益民吕俊锋李昂桑玲华童玉宝
Owner KARAMAY SHENGLI PLATEAU MACHINERY CO LTD