An adjustable perforating device for well completion

Abstract

The invention relates to the technical field of well completion perforation, in particular to an adjustable perforation device for well completion, which includes an annular shell, and the side wall of the annular shell is provided with a plurality of via holes in a helical array at equal intervals around its axis. The inner wall of the hole is coaxially sleeved with a shielding ring, and the lower end of each shielding ring is rotated to be provided with a hemispherical shell, and the outer wall of each hemispherical shell far away from the shielding ring is fixedly provided with a return spring, and the other end of the return spring is fixedly arranged on the side wall of the ring shell. The inner wall of the shielding ring slides along its axis with a supporting ring plate, which passes through the hemispherical shell and is slidably connected with the hemispherical shell; the invention solves the problem that the existing perforating equipment uses folded hoses to extend the perforation depth The expansion and contraction of the length will lead to the problem that the injection angle is not fixed during the water injection injection process. In addition, when encountering hard rock formations, the folded pipe is prone to swing, resulting in large perforations in the wellbore, and the risk of wellbore collapse.

Description

technical field [0001] The invention relates to the technical field of well completion perforation, in particular to an adjustable perforation device for well completion operations. Background technique [0002] Perforation completion: drill through the oil and gas layer, run casing and cement the well, and then run the perforator to shoot the casing and cement sheath until the oil and gas layer is opened to open the channel for oil and gas to flow into the wellbore; this method is beneficial to layered production and water injection And measures to increase production; opening up the oil flow channel is an important process. [0003] In the invention case of a perforating device for well completion disclosed in the prior art, the Chinese patent application number of the invention patent is CN110118077B. A perforating device for well completion includes a shell and a nozzle assembly. The nozzle assembly One end of one end is set in the housing, and the other end protrudes f...

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Problems solved by technology

[0006] The object of the present invention is to provide an adjustable perforating device for well completion to solve the above-mentioned invention cases proposed in the above-mentioned background technology. To a certain extent, it can effectively prolong the perforation depth. However, due to the pursuit of perforation depth, when the perforation device moves inside the wellbore initially, the hose is obliquely folded inside the perforation device. The hose stretches, and the hose itself can be bent to a certain extent, which may cause the injection angle to be unstable during the water injection injection process. When encountering a hard rock formation, the folded pipe will swing, resulting in a large perforation of the wellbore, resulting in a large hole in the wellbore. There is a risk of collapse, and secondly, due to the perforation angle inclined to the axis of the wellbore, it is very easy for the perforation equipment to move backward, resulting in the problem that the perforation position cannot be accurately controlled

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