Stimulation method for deep open-hole horizontal wells in carbonate fractured-cavity reservoirs with staged acid pressure and controlled water production

Abstract

The invention provides a method for increasing production of a deep open-hole horizontal well in a fractured-cavity carbonate reservoir by staged acid pressure control and water production, and belongs to the technical field of oil and gas well completion. The method comprises: determining the number of stages of the horizontal well staged acid fracturing; performing staged perforation acid fracturing on the horizontal well according to the stage number; controlling water production in each stage after the staged perforation acid fracturing. The invention realizes the determination of the segment number, the whole perforation, segmental fracturing and segmental water control, optimizes the cost-benefit ratio, improves the degree of oil recovery in the control area of ​​the horizontal well, and improves the carbonate rock as a whole. The oil production of deep open-hole horizontal wells in fractured-cavity reservoirs improves the input-output ratio of staged acid fracturing in deep open-hole horizontal wells, which is beneficial to oil production and water control, and has broad application prospects.

Description

technical field [0001] The invention belongs to the technical field of completion of oil and gas wells, and in particular relates to a method for increasing the production of deep open-hole horizontal wells in deep open-hole horizontal wells by staged acid pressure control. Background technique [0002] During the development of conventional oil and gas reservoirs, in order to carry out fracturing operations, it is usually necessary to run casing in the wellbore and cement the well, and then use the perforating gun carried by the tubing or the perforating gun carried by the cable to perforate the well section to be fractured After that, a special wellhead for fracturing is installed at the wellhead, and high-pressure liquid is pumped in to perform fracturing operations on the perforated section. As for water control in horizontal wells with casing cementing, there are relatively few methods for water control in horizontal wellbores for casing perforation and fracturing compl...

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Problems solved by technology

[0004] For the tight lithologic reservoirs of carbonate fracture-vuggy reservoirs, it is not suitable to run casing cementing, and there is a technical demand for multi-stage fracturing to improve recovery, and at the same time, due to the conventional open hole packer plus sliding sleeve The acid fracturing technology is difficult, the pressure difference of the open hole packer is small, and the ball sliding sleeve causes the pipe string to fail to be fully bored, etc., so it is not ideal for deep open hole horizontal wells in carbonate fracture-cavity reservoirs.

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