In-log trap

Abstract

The invention belongs to the technical field of petroleum, and particularly relates to a catcher used in the well logging process. The catcher is used for preventing instruments from dropping into a well in the process of measuring high-low pressure of an oil and gas well site in the petroleum industry and in the operation process of lifting and dropping steel wires and cables. According to the technical scheme, the catcher used in the well logging process comprises a catcher outer cover which is cylindrical in shape. The inner diameter of the lower end of the catcher outer cover is smaller than the inner diameter of the upper end, an external thread which is arranged on the outer upper portion of the catcher outer cover is connected with a blowout prevention box, a thread on the inner upper portion of the catcher outer cover is connected with an adjusting elastic piece, a slip is arranged on the inner lower portion of the catcher outer cover, and a control spring is arranged between the slip and the adjusting elastic piece. According to the technical scheme, the catcher is simple in structure and small in size, the catcher is installed inside a blowout prevention pipe, a sealing device does not need to be additionally arranged, and the catcher has the catching function of preventing the instruments from accidentally dropping into the well.

Description

technical field [0001] The invention belongs to the technical field of petroleum, and in particular relates to a logging internal catcher which is used for on-site high and low pressure testing of oil and gas wells in the petroleum industry and prevents instruments from falling into the well during operation of lifting and lowering steel wires and cables. Background technique [0002] At present, in the field of high and low pressure testing of oil and gas wells in the petroleum industry, accidents sometimes occur, causing steel wires or cables to break at the wellhead, resulting in accidents of instruments falling into the well. At present, the traps used to prevent the accidental fall of the instrument are all external integrated equipment, which are divided into the upper trap installed on the upper part of the blowout tube and the lower trap installed on the lower part of the blowout tube. Both of them must be connected with the blowout tube when in use. A part of the no...

AI Technical Summary

Problems solved by technology

[0002] At present, in the field of high and low pressure testing of oil and gas wells in the petroleum industry, accidents sometimes occur, causing steel wires or cables to break at the wellhead, resulting in instrument fall accidents

At present, the traps used to prevent the accidental fall of the instrument are all external integrated equipment, which are divided into the upper trap installed on the upper part of the blowout tube and the lower trap installed on the lower part of the blowout tube. Both of them must be connected with the blowout tube when in use. A part of the nozzle column needs to bear the function of sealing high pressure. The disadvantages of this test trap are the complex process structure, high manufacturing cost, and the labor intensity of the operator during use. Disadvantage of leaks, especially against high-pressure well testing

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