Underground pulse generator

Abstract

The invention provides an underground pulse generator and relates to the technical field of oil exploration and drilling exploitation. According to the structure, the underground pulse generator comprises a pulse main valve assembly and a pulse control valve connected to the tail portion of the pulse main valve assembly. The pulse main valve assembly comprises a fish neck assembly and a supporting sleeve, and the fish neck assembly is detachably sleeved with the supporting sleeve. The distance between the fish neck assembly and the supporting sleeve is adjustable. The fish neck assembly is away from the pulse control valve. The supporting sleeve is close to the pulse control valve. The fish neck assembly comprises an inner cavity and a flow limiting ring arranged on the inner cavity wall. A main slide valve is fixed to the supporting sleeve. The main slide valve is located in the inner cavity. The main slide valve is controlled by the pulse control valve so that the main slide valve can slide into or retreat out of the flow limiting ring. The fish neck assembly comprises a first clamping part used for abutting against one end of the flow limiting ring, and a second clamping part used for abutting against the other end of the flow limiting ring. The first clamping part and the second clamping part are fixed through fixators so that the flow limiting ring can be clamped to the fish neck assembly. By the adoption of the underground pulse generator, the stability of pulse signals can be guaranteed under different mud flow conditions.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and drilling, in particular to a pulse generator for downhole use. Background technique [0002] Drilling equipment is an indispensable tool in the process of oil exploration and drilling. The core of drilling equipment is the drill bit, so it is necessary to monitor the drilling status of the drill bit at any time. However, with the deepening of drilling, the drill bit will go deep into the formation, and it is difficult for the staff on the ground to directly observe the situation of the drill bit. Therefore, it is necessary to install various monitoring devices at the drill bit, such as direction sensors and temperature sensors. The data will be transmitted to the ground through the communication line, and the staff on the ground will receive and analyze it. [0003] Because the underground environment is very harsh, it is difficult for the detection device to communicate with t...

AI Technical Summary

Problems solved by technology

[0005] Due to the structure of the parts that fix the current limiting ring, the current limiting ring of the existing pulse generator cannot move back and forth after the current limiting ring is fixed, so that the current limiting ring cannot be easily replaced according to the flow rate of the mud. To replace the current limiting ring, many structures of the pulse generator need to be changed, and the cost is relatively high

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