Offshore thickened oil steam huff-puff injection-production integrated device

Abstract

The invention provides an offshore thickened oil steam huff-puff injection-production integrated device. The offshore thickened oil steam huff-puff injection-production integrated device comprises a high-temperature wellhead, a downhole safety control system and an aerogel heat insulation oil pipe located in a production casing pipe. The aerogel heat insulation oil pipe is provided with an aerogelheat insulation coupling, a downhole safety valve, a cable passing packer, a hydraulic control pipeline and a Y-shaped connector. The improvement lies in that the aerogel heat insulation oil pipe isfurther provided with an injection-production conversion valve and connected with a common oil pipe through a penetrating device, and a bottom fixing device is arranged at the bottom of a perforated oil pipe connected with the common oil pipe; a high-temperature optical fiber enters the perforated oil pipe and then is connected with the bottom fixing device; a downhole safety control system hydraulic control pipeline and a high-temperature cable are arranged on the outer side of the aerogel heat insulation oil pipe; the downhole safety control system hydraulic control pipeline is connected with an exhaust valve and a ground hydraulic control system; and the high-temperature cable is connected with a high-temperature electric pump and a ground electric pump control cabinet, and a check valve is arranged at an outlet of the high-temperature electric pump and connected with the Y-shaped connector. The offshore thickened oil steam huff-puff injection-production integrated device can be simply converted between steam injection and periodic production, and has the function of online monitoring of well bottom high-temperature parameters.

Description

technical field [0001] The invention belongs to the technical field of offshore heavy oil development and thermal recovery, and in particular relates to an integrated device for steam huffing, puffing, injection and production of offshore heavy oil. Background technique [0002] my country's offshore reserves are rich in heavy oil resources, and more than 60% of its proven reserves are heavy oil reserves. After more than ten years of continuous exploration and testing, the development of heavy oil thermal recovery on offshore platforms has established a pilot test area for multivariate thermal fluid huff and puff and steam huff and puff. The thermal fluid huff and puff technology has a large content of non-condensable gas, and gas channeling between wells is difficult to control after multiple rounds of huff and puff, and there are technical limitations in its large-scale promotion and application at sea; the steam huff and puff technology is the main heavy oil recovery techno...

AI Technical Summary

Problems solved by technology

[0003] The offshore platform has a small space, and the temperature and pressure of the steam huff and puff construction operation are high. At present, there is no injection-production integrated string mode suitable for the development of heavy oil steam huff and puff on the offshore platform at home and abroad. The offshore pilot test area generally adopts the separation of the heat injection string and the production string. The operation mode is: replace the heat injection string in the workover operation of the heavy oil well before the steam injection, and replace the production string in the workover operation after the blowout of the brine well. This method has the following disadvantages: ①Frequent operation to wash and kill the well The precious heat energy is consumed by the cold fluid, the steam heat utilization rate is greatly reduced, and the thermal recovery and development effect is greatly reduced; ②Drilling and workover rig operation resources are occupied for a long time, which affects the number of heavy oil wells on the platform, and new oilfields The production of reserves is limited; ③ Offshore workover operations are expensive, and frequent operations have significantly increased the cost of offshore heavy oil development; ④ Long-term tripping and running of strings also affects the integrity of casings in heavy oil wells on platforms, bringing safety development risks

Problems in this integrated pipe string: the movable plug has been washed by steam and fluid for a long time, and the sealing performance is poor; there is a safety risk in the pipe string, and the high temperature downhole safety control system is not considered to prevent special working conditions; the wellbore and horizontal Monitoring function of section high temperature parameters

The disadvantages of this integrated pipe string: the Y-shaped plug is greatly affected by the well deviation during steel wire operation, and it is more difficult to operate when the well deviation exceeds 60 degrees. During the production period, the well deviation at the pump hanging position is mostly close to 70-80 degrees, or even in a horizontal state; there is a risk of the pipe string falling into the well during the steel wire operation, and the well cleaning and killing process must still be performed during the operation; the overall temperature resistance of the pipe string and key downhole tools is suitable for 250 The application of ℃ multi-component thermal fluid stimulation technology is not suitable for the injection of high-temperature steam at 350 ℃; the pipe string does not consider the monitoring of high-temperature and high-pressure data in the wellbore and horizontal section, and cannot dynamically adjust the steam injection profile in the horizontal section; the high-temperature and high-pressure conditions of the compensator in the pipe string There is a risk of leakage due to poor sealing, and the inner diameter is not consistent with the inner diameter of the heat-insulated pipe, and the risk of high-temperature steam erosion is likely to be formed at both ends; the packer is sealed by pressing the ball seat, and there is a cycle when pressing or pulling out the ball valve Fluid leakage risk and high temperature steam erosion risk during heating process

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