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Annular space continuous nitrogen injection auxiliary heat insulation method for offshore thermal recovery

An annulus, nitrogen injection technology, applied in the direction of fluid production, earthwork drilling, wellbore/well components, etc., to reduce the probability of casing damage, increase elastic energy, and improve water recovery rate

Active Publication Date: 2013-11-06
CHINA NAT OFFSHORE OIL CORP +2
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  • Description
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Problems solved by technology

Obviously, conventional wellbore insulation technology can no longer meet the technical requirements of offshore heavy oil thermal recovery, and it is necessary to find a more effective wellbore insulation technology

Method used

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  • Annular space continuous nitrogen injection auxiliary heat insulation method for offshore thermal recovery
  • Annular space continuous nitrogen injection auxiliary heat insulation method for offshore thermal recovery
  • Annular space continuous nitrogen injection auxiliary heat insulation method for offshore thermal recovery

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Embodiment Construction

[0027] The present invention is essentially different from the annular space nitrogen filling technology in the above-mentioned patents in terms of purpose and process. like figure 1 As shown, the present invention continuously injects nitrogen 2 into the annulus between the heat-insulated oil pipe 4 and the casing 3 under the premise of utilizing the heat-insulated oil pipe 4 during the thermal recovery and heat injection period, and the nitrogen 2 is in the heat-insulated oil pipe 4. The output end merges with the injected thermal fluid 1 and enters the formation.

[0028] In addition, on the output end of the casing 3, a screen 6 is installed through the top packer 5, so as to play the role of sand control.

[0029] The present invention uses high-vacuum prestressed heat-insulated oil pipes as the main heat-insulation measure. When selecting insulated tubing, first select the insulation level of the insulated tubing according to the heat injection temperature, heat inject...

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Abstract

The invention discloses an annular space continuous nitrogen injection auxiliary heat insulation method for offshore thermal recovery. The method comprises the following steps that: thermal fluid is injected into a heat-insulating oil pipe; nitrogen is continuously injected into an annular space which is formed between the heat-insulating oil pipe and a sleeve; the nitrogen is converged with the thermal fluid at an output end of the heat-insulating oil pipe; and the nitrogen and the thermal fluid are input to a stratum together. By the method, annular space heat insulation of a heat injection period can be realized, the sleeve is protected, the continuously injected nitrogen simultaneously enters the stratum, the energy of the stratum is increased, the energy increasing and pressure keeping effects are carried out, and meanwhile, the sweep range of the thermal fluid can be improved and the thermal recovery effect is improved.

Description

technical field [0001] The invention relates to an annulus continuous nitrogen injection auxiliary heat insulation technology for the exploitation of heat injection fluid in heavy oil wells. Background technique [0002] Heavy oil has high viscosity and poor fluidity, and conventional cold recovery can no longer meet the needs of efficient oilfield development. Therefore, hot fluid injection (hot water, steam or a mixture of steam and non-condensate gas) has become one of the main technologies for heavy oil production at home and abroad. In the process of huffing and puffing of heat injection fluid in heavy oil wells, if the heat insulation effect of the wellbore is not ideal, with the increase of huffing and puffing rounds, the casing will be damaged and deformed by repeated high temperature and high pressure thermal stress, which will seriously affect the normal production of the oil well; At the same time, as the temperature of the casing rises, the heat loss to the form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/24
Inventor 孙永涛林涛孙玉豹王少华张玉久唐晓旭邹剑
Owner CHINA NAT OFFSHORE OIL CORP
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