All-metal screw pump heavy oil injection and production integrated control device and method

Abstract

The invention relates to a full-metal screw pump thickened oil injection-recovery integrated control device and method. According to the technical schemes of the full-metal screw pump thickened oil injection-recovery integrated control device and method, a center pipe is mounted in a casing inner cavity, a rotor connecting rod is mounted in an inner cavity of the center pipe and connected to a rotor of a full-metal screw pump through a screw pump connector, and a fixing ring is mounted in an inner cavity of the lower middle portion of the center pipe; a sliding ring is mounted on the outer wall of the rotor connecting rod, and a movable ring is mounted between the fixing ring and the sliding ring; and a cylinder sleeve is fixed to the outer side of the middle of the center pipe through a connecting protrusion, a steam injecting hole is formed in the lower side of the middle of the center pipe, a pressure relief hole is formed in the upper side of the middle of the center pipe, and thelower portion of the cylinder sleeve is matched with the steam injecting hole through a steam injecting piston to achieve opening and closing. The full-metal screw pump thickened oil injection-recovery integrated control device and method have the beneficial effects that the screw pump does not need to be lifted up and put down in steam injecting and pressure relief, the operation cost is reduced,and the occurrence probability of safety accidents caused by operation is also decreased; and steam injecting can be conducted according to the requirement of a stratum at any time, the constructioncost and time are reduced, and the thickened oil recovery efficiency is greatly improved.

Description

technical field [0001] The invention relates to an auxiliary device and method for oil production in the petroleum industry, in particular to an all-metal screw pump heavy oil injection-production integrated control device and method. Background technique [0002] In the process of oil extraction, heavy oil has special characteristics of high viscosity and high freezing point, and some technical difficulties have been encountered in various aspects of development and application. Colloids, asphaltenes and long-chain paraffins cause crude oil to accumulate in reservoirs and wellbores. Fluidity becomes poor. For rod pumping wells that are widely used, when heavy oil is exploited, due to high viscosity and high wax content, the oil flow channel of the tubing is reduced, and the upward and downward resistance of the sucker rod string Increase, donkey head "fighting" phenomenon is likely to occur during the downstroke, and the load on the donkey head increases during the upstroke...

AI Technical Summary

Problems solved by technology

However, the existing problem is that although the screw pump does not need to be completely lifted out of the wellhead, it is only lifted for a certain distance, which can reduce the working time, but it is still necessary to lift the rotor part of the screw pump, and every time the metal rotor is lifted and lowered There may be a wear and tear on the metal stator, and there will generally be errors in its lowering, which may cause a collision with the stator every time the all-metal rotor is lowered, thereby reducing the service life of the screw pump. Although the invention also uses some Technical means to reduce its collision or wear, but there is still the possibility of wear or collision, reducing the service life of the screw pump; in addition, the lifting of the rotor of the screw pump requires large-scale hoisting equipment, which also increases the operating cost and construction. the danger of

The problem with this invention is that the rotor part of the screw pump still needs to be lifted up, and every time the metal rotor is lifted and lowered, the metal stator may be worn out once, although the process of lifting and lowering it uses a motor and a injection pump. The integrated wellhead of gas production and oil production is completed, which reduces the error and the probability of collision between the rotor and the stator, but this still cannot avoid the wear and tear on the stator every time the all-metal rotor is lowered and lifted, so it will still reduce the performance of the screw pump. service life

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