Acid fracturing and water controlling integrated device, acid fracturing and water controlling tubular column and acid fracturing and water controlling method

Abstract

The invention provides an acid fracturing and water controlling integrated device which comprises an acid fracturing unit and a water control short section. The acid fracturing unit comprises an acidfracturing base pipe, an outer cylinder and an acid fracturing sliding sleeve. an acid fracturing inner hole is formed in the outer wall of the acid fracturing base pipe, the outer cylinder is mountedoutside the acid fracturing base pipe, an acid injection hole is formed in the outer wall of the outer cylinder, the acid fracturing sliding sleeve is arranged in an annular space between the acid fracturing base pipe and the outer cylinder, and the acid fracturing sliding sleeve is configured to cover the acid injection hole in an initial state and move in an acid injection state to open the acid injection hole, the water control short section is connected with the acid fracturing unit and comprises a water control base pipe and a water control mechanism installed on the water control base pipe, and the water control mechanism only allows fluid in a shaft to flow towards the water control base pipe in a one-way mode. The invention further provides an acid fracturing and water controllingtubular column and an acid fracturing and water controlling method.

Description

technical field [0001] The invention relates to the technical field of oil and gas well completion, in particular to an acid pressure water control integrated device for an acid pressure water control string. The invention also relates to an acid pressure water control column and an acid pressure water control method. Background technique [0002] In recent years, with the rapid development of science and technology in our country, the demand for new energy has increased continuously, and the output of old oil fields in the central and eastern parts of my country has declined. Therefore, in order to ensure my country's energy security, the focus of my country's oil exploration and development has gradually shifted to the deep sea and Northwest and other deep and ultra-deep well reservoirs. [0003] In order to develop deep wells and ultra-deep well reservoirs more efficiently, especially Northwest ultra-deep well carbonate fracture-cavity reservoirs and ultra-deep well frac...

AI Technical Summary

Problems solved by technology

[0005] However, there are many problems in conventional segmented acid fracturing

For example, for the staged fracturing method of the open hole packer with a ball seat sliding sleeve, it is necessary to throw a ball to open the sliding sleeve, so there is a problem of extreme difference in the different diameters of the ball seat and the ball

Moreover, the sliding sleeve with a ball seat cannot achieve a full bore. In this case, if a full bore is to be achieved, the ball seat needs to be drilled out with the help of coiled tubing or drill pipe.

For ultra-deep horizontal wells, due to the limitation of the inner diameter of the coiled tubing and the influence of fluid friction, it is difficult to remove the ball seat by coiled tubing, and it is difficult to select a small drill under the multi-stage casing structure to remove the ball seat by using a drill pipe. Rod problems, and the problem of torque values ​​for small drill pipes

At the same time, if the operation of drilling and removing the ball seat is carried out, the pipe string needs to be lifted three times, and the time and operation cost are large.

For the casing cementing and bridge plug staged fracturing method, there are problems in cementing the horizontal section of ultra-deep horizontal wells, pumping bridge plugs in ultra-deep wells, and drilling and removing bridge plugs, and it also requires three trips. trip string

However, for the staged fracturing method of sliding sleeves opened by coiled tubing, there is a problem of cementing in the horizontal section of ultra-deep horizontal wells.

Moreover, this method also requires at least two trips of the pipe string

In addition, the above three staged acid fracturing methods are only simple acid fracturing completion methods, and do not take into account the problem of flow control and water control after staged acid fracturing in horizontal wells

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