Horizontal well mechanical layering and hydraulic jet fracture acidizing compound technique pipe

Abstract

The invention relates to a horizontal well mechanical layering and hydraulic jet fracture acidizing compound technique pipe in the field of oil field horizontal well operation tools. The horizontal well mechanical layering and hydraulic jet fracture acidizing compound technique pipe comprises a casing and an oil pipe, wherein the lower end of the oil pipe is connected with a safe joint; the oil pipe below the safe joint is provided with a plurality of levels of sliding sleeve sand blowers and hydraulic ejectors in a crossing way; packers are respectively arranged on two sides of each level of sliding sleeve sand blower; centering guides are respectively arranged on two sides of each level of hydraulic ejector; the oil pipe connected with the last sand blower is provided with a ball seat, a sieve tube and a guiding shoe in sequence; except for the last ejector, a sliding sleeve I used for packing a sand ejection hole is arranged in each hydraulic ejector; a sliding sleeve II is arranged in each sliding sleeve sand blower; the upper opening of each sliding sleeve is provided with a ball seat in a matching way; a limit seat corresponding to the lower opening of each sliding sleeve is correspondingly arranged in the oil pipe; the inner drift diameter size of each level of sliding sleeve and the diameter of a low-density ball matched with each level of sliding sleeve are decreased in sequence from the near wellhead to the far wellhead, and the inner diameter of the previous level of sliding sleeve is larger than the diameter of the later level of low-density ball.

Description

technical field [0001] The invention relates to the field of oilfield horizontal well operation tools, in particular to a horizontal well mechanical delamination and hydraulic jet fracturing acidification composite process string. Background technique [0002] Although the horizontal well can increase the contact area between the wellbore and the oil layer, increase the production of oil and gas and the ultimate recovery factor, due to the low permeability, large seepage resistance and poor connectivity of the low-permeability reservoir, sometimes the single-well productivity of the horizontal well is also relatively low. Low, can not meet the requirements of economic development, but also to stimulate production of horizontal wells to increase the productivity of horizontal wells. The focus of fracturing in the horizontal section of a horizontal well is different from that of a vertical well. In the 1980s, domestic and foreign researches on the fracturing and stimulation t...

AI Technical Summary

Problems solved by technology

[0012] 1) Large frictional resistance, high wellhead pressure during construction, large casing damage caused by annular fracturing, and deep well application are limited;

[0013] 2) Due to the large wear and limited life of the nozzle, the amount of sandblasting in each section is less than that of mechanical layering;

[0015] 4) It is not suitable for fracturing and re-exploitation of strata that have been exploited for a period of time

Existing problems: Horizontal well packers are often hydraulically set, but it is easy to cause sand stuck in the packer and cannot be unsealed, causing downhole accidents

[0018] 1) It is difficult to deal with sand plugging;

[0019] 2) The temperature resistance and pressure resistance of the packer are limited by the well depth

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