Sand-out returning fluid stop valve for oil well and application method of stop valve

Abstract

The invention belongs to the technical field of tools for the oil and gas field and particularly provides a sand-out returning fluid stop valve for an oil well and an application method of the stop valve. The stop valve comprises an upper connector, a baffle, a pressure balance spring, a stop valve body, a setting ball, a ball seat, an upper oil pipe male buckle and a lower oil pipe female buckle.The problems are solved that in the prior art, during sand-out of the oil well, in the process of replacing a joint, there is still full of water in the well field, the requirement of the environmental protection act cannot be met, in the reverse-circulation sand-out process, the flow direction of pumped fluid is identical to that of returning fluid during sand-out and joint replacement, a checkvalve cannot be installed on an in-well pipe column, if the project is complex in the sand-out process, forward sand-out and reverse sand-out are needed, and installation of the check valve cannot meet the construction demand. According to the stop valve, overflowing of the returning fluid in the sand-out operation joint replacement process can be effectively blocked, the environmental pollution is avoided, site construction is effectively guided, the sand-out operation efficiency of a common oil pipe is improved, and the safety and environment protection risks are reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field tools, and in particular relates to an oil well sand flushing return liquid shut-off valve and a use method thereof. Background technique [0002] At present, the sand flushing of oil wells is basically reverse circulation and open operation. After the return fluid is collected at the wellhead, it directly enters the sewage pit through the drainage channel, and is sprinkled on the well site. With the promulgation of the new "Environmental Protection Law", this sand washing mode is no longer suitable for the job site, and open operation is not advisable. In the absence of new technology to replace it, the site can only connect high-pressure elbows to a single oil pipe. And the high-pressure water hose, which connects a large amount of return liquid to the grit chamber for recovery. However, in the process of replacing a single pipe, due to the exciting pressure of the liquid in the well,...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides an oil well sand flushing return liquid cut-off valve and its use method. The first purpose is to overcome the problem that in the prior art, during the oil well sand flushing, in the process of replacing a single root, due to the excited pressure of the liquid in the well, some of them also contain When a small amount of gas is connected to a single pipe, the oil pipe coupling is at a height of 10 meters, and the return fluid will be lifted 10 meters high and then sprinkled. The well site is still full of water, which cannot meet the requirements of the "Environmental Protection Law"; the second purpose It is to overcome that in the process of reverse circulation sand washing in the prior art, the flow direction of the pumped liquid is consistent with the flow direction of the return liquid when the sand washing is replaced with a single one. The project is complex and needs to be flushed and recoiled, and the installation of check valves cannot meet the construction requirements

Images