High-temperature-resistant and high-pressure-resistant packer

Abstract

The invention relates to the technical field of oil field natural gas extraction, in particular to a high-temperature-resistant and high-pressure-resistant packer which is firm in installation, good in sealing performance, resistant to high temperature and high pressure and capable of improving use reliability. The high-temperature-resistant and high-pressure-resistant packer comprises an upper joint, a sealing mechanism, a seat clamping mechanism, a locking mechanism, a central pipe, a lower piston, a thrust piston and a lower joint. Two groups of pressure-transmitting holes are arranged on the lower joint in a communicated manner. The central pipe is in threaded connection with the lower part of the upper joint. The lower piston is in threaded connection with the thrust piston. The lowerjoint is in threaded connection with the central pipe. The middle of the upper connector is sleeved with the upper half area of the sealing mechanism and the upper half area of the seat clamping mechanism. An upper seat clamp comprises a positioning key, an upper slip and a first shear pin, a lower seat clamp comprises a lower slip, and a second shear pin is arranged on the lower slip. The sealing mechanism comprises two sets of rubber sleeve fixing rings, two sets of fixing rubber sleeves, two sets of rubber blocking pieces and two sets of protective covers.

Description

technical field [0001] The invention relates to the technical field of oil field natural gas exploitation, in particular to a high temperature and high pressure resistant packer. Background technique [0002] As we all know, it is very difficult for major oil fields in the country to exploit deep oil wells (3000 meters deep underground crude oil), and it is even more difficult to exploit natural gas (natural gas is generally more than 7000 meters deep wells). The temperature is as high as about 200℃ and contains various corrosive and toxic gases. This kind of high-pressure and high-temperature wells are self-flowing wells. The packers currently used cannot withstand such high pressures. After the packers are set, the rubber tubes are not tightly sealed. And high-pressure gas directly erodes the rubber sleeve, resulting in the phenomenon that the annulus of tubing and casing cannot be isolated. The annulus of tubing and casing generates high pressure, and the corrosive gas co...

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Problems solved by technology

[0002] As we all know, it is very difficult for major oil fields in the country to exploit deep oil wells (3000 meters deep underground crude oil), and it is even more difficult to exploit natural gas (natural gas is generally more than 7000 meters deep wells). The temperature is as high as about 200℃ and contains various corrosive and toxic gases. This kind of high-pressure and high-temperature wells are self-flowing wells. The packers currently used cannot withstand such high pressures. After the packers are set, the rubber tubes are not tightly sealed. And high-pressure gas directly erodes the rubber sleeve, resulting in the phenomenon that the annulus of tubing and casing cannot be isolated. The annulus of tubing and casing generates high pressure, and the corrosive gas corrodes the upper casing of the packer and affects the well control A great potential safety hazard is generated, and blowout accidents may occur in severe cases

[0003] The packers of the existing technology on the market are generally ordinary rubber tubes. The rubber tubes are generally made of fluorine rubber, which can only withstand pressures within 10,000 PSI or lower. If the pressure exceeds 10,000 PSI, the rubber tubes will be deformed. Or be eroded by gas, and will cause leakage, unable to maintain the sealing state, and the slips of the existing packers on the market are annular, and the ring outer diameter milling strip groove is easy to crack when setting the seal, and the slips are installed in the The upper and lower sets of rubber cartridges are designed with this structure. When the packer is set, the upper and lower sets of slips are pushed down by the vertebral body and cracked one after another. They are stuck on the inner wall of the casing, and the upper slips will not move and get stuck. The lower slips need to move a certain position in the direction of the upward slips to squeeze the rubber sleeve, so that the rubber sleeve is deformed and tightly adhered to the inner wall of the casing to seal the oil pipe and casing annulus, and the lower annular slip is in the rubber When the rubber tube is not completely deformed, it will be split into four pieces and attached to the inner wall of the casing under the push of the vertebral body, and the rubber tube will not be deformed and slip in place and cannot be pushed, resulting in the packer not being set tightly and working When the pressure is close to 10,000PSI, the rubber tube will be deformed and the gas will directly erode the rubber tube, causing the packer to leak and finally fail

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