Safety protection device for piano wire

Abstract

The invention discloses a safety protection device for a piano wire. The safety protection device comprises a blowout prevention pipe connection segment, a bearing support segment, a rotary stepwise decontamination segment, a liquid injection segment and a dirt drain hole, wherein the upper end of the blowout prevention pipe connection segment is connected with a blowout prevention pipe; the lowerend of the blowout prevention pipe connection segment is connected with a shaft gas production tree shaft mouth flange; the five parts of the safety protection device are of cylindrical structures, and are all arranged inside the blowout prevention pipe connection segment; the blowout prevention pipe connection segment, the bearing support segment and the rotary stepwise decontamination segment are sleeved sequentially from outside to inside; the rotary stepwise decontamination segment comprises a first rotating body, a second rotating body, a third rotating body and a fourth rotating body which are connected sequentially from bottom to top, and is used for removing dirt from the piano wire stepwise, and draining the removed dirt through the dirt drain hole; and the liquid injection segment is arranged on the blowout prevention pipe connection segment transversely, and is used for lubricating and cooling the piano wire after being injected with liquid. The safety protection device caneffectively remove sundries attached to the piano wire, and cool the piano wire.

Description

technical field [0001] The invention relates to the field of well testing and testing operations of oil and gas wells, in particular to a safety protection device for well testing steel wires. Background technique [0002] In the process of oil and gas field development, it is often necessary to understand the performance of oil and gas reservoirs through well testing, such as obtaining test data to evaluate the production performance of oil and gas wells, studying various physical parameters, production capacity, And the connectivity among oil layer, gas layer and water layer etc. Among them, the well test test operation mainly tests formation pressure, temperature and flow rate changes, etc. Specifically, a steel wire well test winch is usually used to operate the test equipment (electronic pressure gauge) into the high-pressure wellbore for testing. [0003] In the related technology, the well test steel wire is used as the carrier for connecting the test equipment, and ...

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Problems solved by technology

[0003] In the related technology, the well test steel wire is used as the carrier for connecting the test equipment, and its diameter is usually only 2.33mm. During the hoisting process of the well test steel wire, wax, mud, mudstone, sand, oil and water and other sundries tend to adhere to the well test steel wire. When the well test wire is moved out of the high-pressure wellbore and returned to the atmospheric pressure state and then retracted to the wire test drawworks, the well test wire with debris and the top seal of the blowout pipe will rub against each other, which may cause the well test wire to be pulled. The stress increases and the fracture occurs, which in turn causes the test equipment and well test steel wire to fall into the bottom of the well, causing huge economic losses

In addition, a dynamic sealing surface will be formed between the well test wire with debris and the top seal of the blowout preventer. Since the debris is not smooth and flat, the seal is not tight, so there will be oil and gas leakage from the wellbore to the surroundings of the well site. potential safety hazards, especially if the oil and gas contain substances such as hydrogen sulfide, there will be a risk of personnel poisoning

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