Workover operation method, system and process_workover rig manufacturer
Release time:
2020-06-08
After the oil well is put into production, the casing in the oil well may be blocked and the inner diameter becomes smaller, which will cause some production tools to be unable to be lowered into the oil well through the casing, thus causing the oil well to fail to produce normally. In this case, it is necessary to carry out a workover operation, that is, to repair the well casing. In the workover operation, it is necessary to use the drilling tool to mill the casing to remove the casing blockage and expand the inner diameter of the casing, so as to ensure that the production tool can be lowered into the oil well through the casing.
In the related art, workover operations generally require the use of large workover equipment, and are equipped with special tools such as overhaul drill pipes and overhaul turntables.
In the process of realizing the present invention, the inventor found that the existing technology has at least the following problems:
Large workover equipment is often expensive, heavy and inconvenient to transport. Therefore, the economy and flexibility of workover operations using large workover equipment are poor.
One end of the drilling tool is lowered into the casing to be repaired in the oil well through the rotating blowout preventer, the rotating blowout preventer is arranged at the wellhead of the oil well, the rotating blowout preventer is used to seal the annular space between the drilling tool and the casing to be repaired, and the other end of the drilling tool is connected to the top drive;
Driven by the top drive, the drilling tool rotates to mill the casing to be repaired. Optionally, the rotating blowout preventer comprises a rotating bearing and a sealant core, the rotating bearing is connected to the sealant core, and one end of the drilling tool is lowered through the rotating blowout preventer into the casing to be repaired in the well, including:
One end of the drilling tool is lowered into the casing to be repaired in the oil well through the rotary bearing and the sealant core, the rotary bearing can be driven by the drilling tool to rotate synchronously with the drilling tool, and drive the sealant core to rotate synchronously with the drilling tool, and the sealant core is arranged on the annular space for sealing the annular space.
During the rotary milling of the drilling tool, the liquid in the annular space is withdrawn from the annular space. Optionally, extracting the liquid in the annular space from the annular space comprises:
The liquid in the annular space is pumped out from the annular space by a pump in the trinity multifunctional environmental protection device, and the pumped out liquid is stored in a liquid storage tank of the trinity multifunctional environmental protection device.
Optionally, the drilling tool is a hollow structure, and the method also includes:
During the rotary milling of the drilling tool, a flushing fluid is injected into the drilling tool through a gooseneck on the top drive, and the flushing fluid can flow from the drilling tool into the annular space to flush waste generated by the rotary milling of the drilling tool.
Optionally, the gooseneck pipe is connected with the liquid storage tank through a water pipe, and the flushing liquid injected into the drilling tool is a liquid stored in the liquid storage tank.
In another aspect, a workover operation system is provided, the workover operation system comprising: a drilling tool, a top drive and a rotary blowout preventer;
One end of the drilling tool is connected to the top drive, the rotating blowout preventer is arranged at the wellhead of the oil well, the other end of the drilling tool passes through the rotating blowout preventer into the casing to be repaired of the oil well, and the rotating blowout preventer is used to seal the annular space between the drilling tool and the casing to be repaired.
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