Liquid plunger driven type rubber bag collector for well logging

Abstract

The invention provides a liquid plunger driven type rubber bag collector for well logging. The liquid plunger driven type rubber bag collector for the well logging can improve the reliability and increase the collecting degree, and is suitable for a horizontal well with low liquid productivity and low flow speed. A bag collector jointer comprises a fluid bypass nipple and a rubber bag, wherein the rubber bag is connected onto the outer side wall of an oil pipe, the fluid bypass nipple is connected to the inner side of the oil pipe, a liquid storage channel is formed in the fluid bypass nipple and communicates the rubber bag with a liquid storage cavity in a plunger driven liquid storage cavity jointer; the plunger driven liquid storage cavity jointer comprises the liquid storage cavity with an opening in one end and a liquid pushing piston for sealing the opening end of the liquid storage cavity, and the middle part of the liquid pushing piston is in threaded connection with a lead screw in a motor driven jointer; the motor driven jointer comprises a motor and the lead screw connected onto an output shaft of the motor. The liquid plunger driven type rubber bag collector for the well logging has remarkable in effect and is convenient to operate and use and high in practicability.

Description

technical field [0001] The invention belongs to the field of oil extraction equipment and relates to a current collector, in particular to a rubber leather bag current collector driven by a self-contained liquid plunger for well logging. Background technique [0002] At present, the fluid production profile logging technology of horizontal wells in foreign countries is mainly based on non-concentrating and continuous measurement, which is suitable for high-yield and self-flowing horizontal wells, but not suitable for the absolute majority of domestic horizontal wells with medium and low fluid production. Domestic horizontal well fluid production profile logging mainly adopts the flow logging method based on tractor transportation technology, and a new modular horizontal well flow logging method based on tubing transportation technology has been proposed in recent years; domestic production logging There are two main methods of collecting current in wells: umbrella type curre...

AI Technical Summary

Problems solved by technology

Domestic horizontal well fluid production profile logging mainly adopts the flow logging method based on tractor transportation technology, and a new modular horizontal well flow logging method based on tubing transportation technology has been proposed in recent years; domestic production logging There are two main methods of collecting current in wells: umbrella type current collection method (CN 201020611183.8 ) and rubber ball type current collection method (CN201110347614.3). The umbrella type current collector has the advantage of high reliability. The collector is used in horizontal well logging methods, but due to the gap between the ribs of the collector umbrella and the casing and the impact of the instrument being not centered due to the weight of the logging instrument itself, the umbrella collector The leakage rate is too large, and it is impossible to accurately measure the fluid in various downhole sections of low-yield horizontal wells; the rubber ball collector has the advantage of high flow concentration, but its logging reliability and success rate are low, because the traditional rubber ball collector During the downhole process of the device, the ball is easy to be scratched. In addition, due to poor control of the time to pump liquid into the ball, the ball is easy to explode; the patent CN201110347614.3 (extensible ball collector) of China National Petroleum Corporation proposes a A retractable ball collector applied to vertical wells. This collector uses the pump valve installed at the bottom of the collector to pump the liquid in the well to achieve the inflation of the ball. However, this method has the following two disadvantages: One is that the liquid in the well contains a lot of impurities, and the impurity particles are easy to block the liquid inlet or the infusion pipeline; second, because the turbine speed can only be used to judge whether the ball is full, this method of human judgment is easy to be mistaken. These two factors have seriously affected the reliability of the ball collector

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