Sand prevention and filling system of large casing well

Abstract

The invention relates to a sand prevention and filling system of a large casing well. The sand prevention and filling system of the large cased well comprises a big tank, a main pump vehicle, an auxiliary pump vehicle, a sand-filling funnel and a well-head center part. The upper end of an oil pipe penetrates through the center of the center part, casing gates are connected to the left side and theright side of the center part correspondingly, oil pipe gates are connected to the two sides of the upper part of the oil pipe correspondingly, at least two hooks are welded to the periphery of a horn mouth of the sand-filling funnel, the hooks are hung on supporting rods, all the supporting rods stretch across the upper end of the big tank, a sand-filling adjustment door is installed at a throatof the sand-filling funnel, a plurality of funnel permeable holes are formed in the funnel vertical pipe, and a funnel cross pipe is connected to the lower end of the funnel vertical pipe; an outletof the funnel cross pipe is connected with a water inlet of the main pump vehicle, and a water outlet of the main pump vehicle is connected with one of the oil pipe gate; a water inlet of the auxiliary pump vehicle is connected with an water absorption pipe of the auxiliary pump vehicle and is inserted in the position below the water line of the big tank, a water outlet of the auxiliary pump vehicle is connected with the other oil pipe gate, and the casing pipe gate is connected with the big tank through a reflux rubber pipe. According to the sand prevention and filling system of the large cased well, sand blockage can be avoided, the labor strength is low, and the success rate is high.

Description

technical field [0001] The invention relates to a sand control and sand filling system, in particular to a sand control and sand filling system for large cased wells, belonging to the technical field of oil production facilities. Background technique [0002] Affected by comprehensive factors such as reservoir physical properties, production, and operation, some oil wells have different degrees of sand production problems, mainly distributed in typical unconsolidated sandstone reservoirs. Compared with other blocks, the sand production period is shorter and the sand production is more serious. Governance is more difficult. At present, the mature and applied sand control technologies are mainly mechanical composite sand control and chemical sand control technologies. [0003] For oil wells with serious sand production, mechanical composite sand control is the main method. The lower part of the tubing is equipped with a sand-wrapped screen, and the top of the screen is connec...

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Problems solved by technology

It is precisely because of the threaded connection, and the applied torque is opposite to the direction of the thread of the pipe string, there is often a phenomenon that it cannot be undone

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