Setting ball seat with secondary opening function

Abstract

The invention discloses a setting ball seat with a secondary opening function, which is used for modifying the mud displacement before string setting of sectional modification of an open hole packet in an oil gas field, and the setting of the open hole packer. The setting ball seat consists of a main body, a sealing ring, a setting slide sleeve, a shear nail of the setting slide sleeve, a communicating slide sleeve, a circulation port, a shear nail of the communicating slide sleeve, a fracturing port, a lock ring and a lock buckle. The setting ball seat has the advantages that the setting ballseat is connected with the lower end of a differential pressure slide sleeve in a completion string of the open hole packer and the upper end of a float collar, so as to realize the function of providing a liquid circulation passage and a setting packer before setting, and providing a standby fracturing passage; the defect of discard of the whole well due to failure to fracture the first sectioncaused by accidently failure to open the differential pressure slide sleeve after packer setting is overcome; when the shear nail of the setting slide sleeve is sheared, the setting slide sleeve is moved down, the circulation passage is closed, the entering of liquid in the well into the oil pipe due to the failure of the float collar is prevented, and the well control risk in the drill lifting and lowering process is avoided.

Description

technical field [0001] The invention belongs to the technical field of fracturing and acidizing of oil and gas wells, and in particular relates to a setting ball seat with a secondary opening function. Background technique [0002] In order to increase the single-well production of oil and gas wells, horizontal wells have become an effective means for the development of low-permeability oil and gas fields in recent years. Among them, the open-hole horizontal well has become an important horizontal well completion method because of its large contact area with the formation. Open-hole horizontal well segmental reconstruction is mostly carried out with open-hole packers, among which compression-type open-hole packers are widely used because of their high tool pressure, small length, and low running risk. Since the compression-type open-hole packer needs to suppress the internal pressure of the pipe string to complete the setting, the setting ball seat can provide the setting p...

AI Technical Summary

Problems solved by technology

If the pressure relief hole of the differential pressure sliding sleeve body is blocked by mud or cannot be opened normally due to other accidental reasons, the first stage cannot be fractured normally, and at the same time, since the circulation channel of the setting ball seat has been closed, the liquid circulation channel cannot be established , resulting in the inability to pump the fracturing balls in the subsequent section. Under the condition that the inner diameter of the upper ball seat allows, the channel can only be established by perforating the coiled tubing, which increases the construction risk. At the same time, it may be necessary to abandon some sections, thus affecting the single well production; and for wells that cannot meet the requirements of coiled tubing perforation, it may even directly cause the entire well to be scrapped, resulting in huge economic losses

Images