Double-layer coiled tube sand pumping device and double-layer coiled tube sand pumping technology

Abstract

The invention discloses a double-layer coiled tube sand pumping device. The double-layer coiled tube sand pumping device comprises a coiled tube roller, a driving device, a coiled tube, a water pump, an injection head, a pit shaft arranged in a wellhead and a blowout preventer; the double-layer coiled tube sand pumping device is characterized in that the coiled tube comprises an inner tube and an outer tube, an annular space is formed between the inner tube and the outer tube, and the rear end of the annular space is sealed; a de-plugging spray head is arranged on the front end of the coiled tube; the outer tube which is higher than the wellhead is connected with a sand discharging tube which is communicated with the annular space, and the sand discharging tube is provided with a valve. The invention also discloses a double-layer coiled tube sand pumping technology. According to the double-layer coiled tube sand pumping device and the double-layer coiled tube sand pumping technology, disclosed by the invention, sand liquid is enabled to enter the annular space by pumping high-pressure water into the inner tube and opening a sand inlet in the de-plugging spray head during a sand blasting, and discharging the sand liquid by utilizing a high-pressure gas in a well; the double-layer coiled tube sand pumping device and the double-layer coiled tube sand pumping technology have the advantages that the damage to the stratum is small, the follow-up production is facilitated, the sand discharging efficiency is high, and the energy consumption is low.

Description

technical field [0001] The invention relates to a double-layer coiled tubing sand pumping device and technology for gas wells. Background technique [0002] After a period of use of gas wells for natural gas production, the sand in the wells is easy to deposit and block the well passage. At this time, it is necessary to pump out the sand to ensure the smooth progress of gas production. At present, the sand pumping methods used for gas wells mainly include gas lift pumping. There are two types of sand pumping and bubble pumping. The former injects liquid nitrogen and compressed gas into the well through the choke manifold, and the gas expands to bring out the sand from the tubing; the latter pumps sand through the coiled tubing drum and driving device, coiled tubing, water pump, The first class sends the coiled tubing into the well, injects the foam discharge agent into the well, and after the foam is formed, the foam is blown out by the air compressor to achieve the purpose ...

AI Technical Summary

Problems solved by technology

[0002] After a period of use of gas wells for natural gas production, the sand in the wells is easy to deposit and block the well passage. At this time, it is necessary to pump out the sand to ensure the smooth progress of gas production. At present, the sand pumping methods used for gas wells mainly include gas lift pumping. There are two types of sand pumping and bubble pumping. The former injects liquid nitrogen and compressed gas into the well through the choke manifold, and the gas expands to bring out the sand from the tubing; the latter pumps sand through the coiled tubing drum and driving device, coiled tubing, water pump, The first class sends the coiled tubing into the well, injects the foam discharge agent into the well, and after the foam is formed, the foam is blown out by the air compressor to achieve the purpose of sand removal; both methods have medium expansion, which will damage the formation and is not conducive to the follow-up production, and the amount of sand discharge is uncontrollable, sand discharge efficiency is limited, and energy consumption is high

Images