A viscosity-reducing collection well
A technology for viscosity reduction and oil wells, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems that oil wells cannot maintain normal production, flow difficulties in low temperature areas, and loss of fluidity, etc., and achieve improved viscosity reduction effect , Conducive to collection, ensuring efficiency and effectiveness
Inactive Publication Date: 2017-12-22
ZHEJIANG SCI-TECH UNIV
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[0003] However, the water depth of deep-water oil fields is generally between 500 and 2,500 meters. Due to factors such as its deep depth, a low-temperature area will be formed on the seabed. In addition, the temperature sensitivity of heavy oil and its own high viscosity, so in the low-temperature area. Difficulty flowing, or even gradually losing fluidity, so that the oil well cannot maintain normal production
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[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0027] like figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 , Figure 8 In the shown embodiment, a viscosity-reducing collection well includes a main oil pipe 1, a hollow sucker rod 2 with an open upper end, and an oil well shaft 4 extending below the seabed mud line 3, and the oil well shaft is provided with a A riser 5 with an inner cavity, the top of the riser protrudes from the sea surface 6, the wall of the oil wellbore and the pipe wall of the riser are sealed and connected, the main oil pipe passes through the inner cavity of the riser, and the lower end of the main oil pipe extends into In the oil wellbore, the main oil pipe is provided with a screw pump 7, the upper end of the main working screw of the screw pump is connected with the lower end of the sucker rod, and the screw pump is located at th...
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The invention discloses a viscosity-reducing collection well, which aims to provide a viscosity-reducing treatment for heavy oil with high viscosity during the oil recovery process, thereby improving the fluidity of heavy oil and ensuring smooth collection of heavy oil reservoirs. Viscosity reduction collection well. It includes a main oil pipe, a hollow sucker rod, and an oil well shaft. There is a water riser on the oil well shaft. The lower end of the main oil pipe extends into the oil well shaft. There is a screw pump inside the main oil pipe. , The lower part of the oil well bore is provided with a sand control screen, the top of the sand control screen has a screen oil outlet, the screen oil outlet is connected to the oil inlet of the screw pump, a cable is installed in the sucker rod, and one end of the cable is connected to the power supply. The beneficial effects of the present invention are: the heavy oil can be reasonably heated to reduce its viscosity, which is beneficial to collection; carbon dioxide gas and water vapor can be introduced to reduce the viscosity of the crude oil that is about to rise and in the process of rising.
Description
technical field [0001] The invention belongs to the technical field of oil reservoir exploitation, and in particular relates to a viscosity-reducing collection well. Background technique [0002] Heavy oil reservoirs are widely distributed in the world. According to statistics, the geological reserves of heavy oil (including bitumen) reservoirs are at least four times that of proven conventional crude oil reserves, and optimistic estimates can even exceed six times. With the exploration of deep water, deep water heavy oil has received more and more attention, and its exploitation and development activities have also been carried out all over the world. [0003] However, the water depth of deep-water oil fields is generally between 500 and 2,500 meters. Due to factors such as its deep depth, a low-temperature area will be formed on the seabed. In addition, the temperature sensitivity of heavy oil and its own high viscosity, so in the low-temperature area. The flow is difficu...
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IPC IPC(8): E21B43/24
Inventor 孙永剑万昌江刘东升
Owner ZHEJIANG SCI-TECH UNIV