Dynamic oil-and-water displacement testing device of deepwater drilling well production vertical oil storage platform and method thereof

Abstract

The invention relates to a dynamic oil-and-water displacement testing device of a deepwater drilling well production vertical oil storage platform and a method thereof. The testing device comprises avertical platform oil storage system, a single-freedom swinging system, an oil tank, a water tank, an electric heating water boiler, a pipeline system and a temperature acquisition system. The vertical oil storage system is fixed on the single-freedom swinging system and is connected with the oil tank and the water tank through the pipeline system. Compared with the prior art, the dynamic oil-and-water displacement testing device and the method thereof can simulate a regular swinging movement and can simulate the irregular swinging movement of a sea platform in an actual sea condition and furthermore realize high motion stability and high reliability. In a testing process, temperature data of oil and water in the oil storage system can be obtained in real time, thereby understanding a heatconduction condition of the oil and the water. The dynamic oil-and-water displacement testing device has advantages of reasonable design, high simulation degree and convenient operation. The dynamicoil-and-water displacement testing device and the method thereof can accurately research influences of different testing conditions to an oil-and-water displacement result and can systemically verifyapplication feasibility of oil-and-water displacement technology on a floating type sea platform.

Description

technical field [0001] The invention relates to a test device and method, in particular to a dynamic oil-water displacement test device and method of a deep-water drilling production vertical oil storage platform. Background technique [0002] With the decreasing offshore oil and gas resources and the increasing total cost of oil and gas field development, the requirements for the comprehensive capability of "drilling-production-storage-transportation" of deepwater offshore platforms are constantly increasing. Chinese patent CN103912245A and US patent US9327805B2 jointly proposed a " A new type of deepwater drilling and production vertical oil storage platform", which uses oil-water displacement technology to store the crude oil produced by the Spar platform in the oil storage tank where the main body of the platform is located below the water surface. [0003] Oil-water displacement technology is also called wet oil storage technology, which has been widely used in gravity ...

AI Technical Summary

Problems solved by technology

[0004] The proposal of a new type of deepwater drilling and production vertical oil storage platform can greatly improve the flexibility of deepwater engineering technical solutions and reduce the total cost of deepwater oilfield development, but the adoption of oil-water displacement technology in the floating Spar platform will inevitably bring the following Several problems: (1) The shear action of seawater on the bulkhead oil condensate caused by the oil-water replacement operation will cause part of the condensate to break away from the sediment layer and enter the seawater. When the oil content in seawater exceeds a certain level, it may cause damage to the marine environment. Pollution; (2) During the oil-water replacement process, affected by many factors such as flow field disturbance, surfactant, temperature and pressure, an emulsified layer will be formed near the oil-water interface, which will affect the measurement accuracy of the oil-water interface monitor; (3) Platform During the oil storage operation, the temperature of the crude oil entering the oil storage tank is relatively high, and the hot oil is in direct contact with the low-temperature bulkhead and low-temperature seawater, and the heat of the crude oil will be transferred to the seawater inside and outside the tank through the bulkhead and the oil-water interface; (4) Under the joint action of marine environmental loads such as wind, waves, and currents, the vertical oil storage platform for deepwater drilling and production is always in a state of floating motion in the ocean, and the movement of the platform will cause the oil storage tank installed in its hull to also move synchronously , thus causing sloshing of the oil and water stored in the cabin, the height change of the oil-water interface caused by the sloshing may lead to the failure of the oil-water interface monitor, and the fluctuation of the oil-water interface caused by the sloshing may lead to the mixing of crude oil and seawater, increasing the production of emulsion , the sloshing will also have a scouring effect on the bulkhead, so that part of the condensed oil that has been deposited on the bulkhead will break away from the sediment layer and enter the seawater, thereby increasing the oil content in the seawater. heat transfer in sea water

However, this patent has many deficiencies: it does not consider the sloshing device, and cannot simulate the impact of the movement of the platform on the oil-water replacement process under complex marine environmental conditions; it does not consider the temperature acquisition system, and cannot study the heat transfer of oil and water in the oil storage tank ;The design of the heating system is not reasonable enough to heat the crude oil evenly from the inside and outside of the oil tank; there is no sampling port at the bottom of the oil storage tank and the water buffer tank, which is not only not conducive to sampling, but also cannot quantitatively study the oil-water displacement of the oil-containing seawater by the water buffer tank. separation effect

That is to say, the current model test equipment can neither systematically study the mass transfer and heat transfer mechanism involved in the oil-water displacement operation of deepwater drilling, production, storage and offloading platforms, nor can it fully verify the feasibility of applying oil-water displacement technology to floating platforms

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