Technological method for offshore platform shipborne circulating well washing and return liquid purification treatment

Abstract

The invention relates to the technical field of offshore oilfield water injection well washing, and in particular relates to a technological method for offshore platform shipborne circulating well washing and return liquid purification treatment. According to the technical scheme, an outlet in the upper side of a Christmas tree is connected with an inlet of a forward and reverse washing skid through a high-pressure rubber pipe, an outlet of the Christmas tree is connected with a first-stage buffer tank, the first-stage buffer tank is connected with a settling tank through a first lifting pump, the settling tank is connected to an oil-water separator, a water outlet of the oil-water separator is connected with a second-stage buffer tank, an outlet of the second-stage buffer tank is connected to a fine filter, a lower-end outlet of the fine filter is connected to a dirty liquid tank, an upper-side outlet of the fine filter is connected to a clear water tank, the clear water tank is connected to a marine well washing pump skid, an outlet of the marine well washing pump skid is connected to the forward and reverse washing skid, and the forward and reverse washing skid is connected to a lower-side circulating inlet of the Christmas tree through a first outlet plug valve. The method has the beneficial effects that the amount of dirty liquid generated by well washing of an offshore water injection well is reduced, the production efficiency is improved, the construction safety is improved, and the environmental protection effect is improved.

Description

technical field [0001] The invention relates to the technical field of well flushing of water injection wells in offshore oil fields, in particular to a process method for circulating well flushing and return liquid purification treatment on board an offshore platform. Background technique [0002] At present, the flushing of water injection wells is an effective means of water injection maintenance in oilfields, and it is also a very important daily work. The existing water injection well flushing process needs to pump clean water into the wellbore through the plunger pump, and replace the original water in the wellbore to the ground, so as to achieve the purpose of cleaning the wellbore. The well flushing process requires a large amount of water resources. At the same time, the returned well flushing fluid contains impurities such as crude oil and sediment, which is easy to pollute the environment and waste a lot of water resources, and there is a certain risk of well cont...

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Problems solved by technology

[0004] In the past, the well-washing process of ship-borne equipment was relatively simple. Referring to the well-washing mode of water injection wells in land oilfields, a simple process of clean water tank-pump skid-water injection well-sewage liquid tank was adopted. The existing problem is that the well-washing fluid cannot be circulated The amount of waste liquid produced is huge; the well control measures are not perfect, and cannot adapt to the actual situation of changing offshore weather and inconvenient transportation, so the efficiency of well cleaning is low and the cost of well cleaning is high.

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