Unlimited-grade well cementation sliding sleeve for preventing cement solidification and assembling and operating method thereof

Abstract

The invention discloses an unlimited-grade well cementation sliding sleeve for preventing cement solidification and an assembling and operating method thereof. The sliding sleeve comprises a central pipe, an upper positioning ring, a lower positioning ring, a piston sleeve and an outer sleeve. The sliding sleeve and a casing pipe are put down together, each section corresponds to one well cementation sliding sleeve, limitation of the number of layers is avoided, and multi-section fracturing can be achieved through one-time pipe column; a locking mechanism is simple and convenient to assemble, once the well cementation sliding sleeve is opened, a locking ring is limited by a straight step and cannot continue to move, and therefore the sliding sleeve is prevented from being closed by mistake; after fracturing construction is completed, the drift diameter in a well is the same as that of the casing pipe, hole shrinkage is avoided, full drift diameter is achieved, and secondary fracturing can be conducted; a certain inclination exists between an inclined long narrow seam on the outermost side and a put-down track, and therefore the risk that solid grease is scraped out of the wall of an open hole well can be reduced; and the contact area between cement and the outer side of the piston sleeve is small, and solidification is not likely to be firm. The piston sleeve for opening the sliding sleeve is not located on the inner side of the central pipe, and the sliding sleeve is prevented from being opened by mistake when the pipe column is put down in the sliding sleeve.

Description

Technical field[0001]The present invention belongs to the field of oilfield development and production, and in particular, the present invention relates to an unlimited grade cementing slip sleeper and its assembly and operation methods.Background technique[0002]In order to meet the needs of the subdivision layer, the infinite grade ceiling segment fracturing technology is carried out. The cementing slide in the technology needs to be connected to the casing, and the solid well slip is opened by mechanical or hydraulic effect. Thereby reducing the shooting operation, and can achieve an infinite grade fracturing, for such a solid well slide, each company has its own related products, in order to prevent the ceasefen slide, it is not closed during the construction process, generally will be in the well A locking mechanism is designed on a slider. The current mainstream product is to lock the blending between the sawtooth threads. The locking mechanism also has more applications on the...

AI Technical Summary

Problems solved by technology

[0002] In order to meet the needs of subdivided formations, the infinite stage cementing sleeve segmental fracturing technology research has been carried out. In this technology, the cementing sleeve needs to be connected with the casing, and the cementing sleeve is opened by mechanical or hydraulic action. In this way, the perforation operation is reduced, and infinite fracturing can be realized. For this type of cementing sleeve, each company has its own related products. In order to prevent the cementing sleeve from being closed by mistake during construction, it is generally A locking mechanism is designed on the sliding sleeve. The current mainstream product is locked through the cooperation between the serrated threads. This kind of locking mechanism is also widely used in the locking mechanism of the packer, but this kind of locking mechanism needs to construct a groove , the split lock ring is assembled in the groove, the inside of the lock ring needs to have serrated threads, and at the same time, a shaft with external serrated threads needs to be added inside the lock ring, and the serrated threads on the outside of the shaft need to match the serrations inside the lock ring. Realize the locking function. In the existing products, the lock ring is generally fixed in the cementing sleeve, and the shaft that cooperates with the inside of the lock ring moves and locks with the lock ring to prevent the cementing sleeve from being closed by mistake. Although the locking mechanism is more commonly used, it is relatively cumbersome

During the construction process, the cement can be consolidated on the outside of the sliding sleeve during the cementing process, so that the sliding sleeve cannot be opened, and the occurrence rate of such accidents is high, so the number of cementing sliding sleeves has decreased sharply.

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