A cage connection device suitable for sand control or well wall support in fishbone branch wells and its application method

Abstract

The invention discloses a cage connection device suitable for sand control or well wall support of fishbone branch wells and its application method. The structure of the cage connection device is as follows: the boom passing through the drill bit is fixed on the suspension ring; the two sides of the lower end of the boom passing through the drill bit are respectively provided with rod bodies; the top end surface of the suspension joint forms a number of grooves I, and each groove I Blind hole Ⅰ and blind hole Ⅱ are respectively provided on the two inner walls of the shaft. The inner diameter of blind hole Ⅰ and blind hole Ⅱ is slightly larger than the outer diameter of the rod body, and the depth of blind hole Ⅱ is greater than that of blind hole Ⅰ; ;By the cooperation between the rod body and the blind hole I and blind hole II, the connection between the boom of the drill bit and the suspension joint is realized; when the spring is compressed, the rod body can escape from the blind hole I; the lower part of the suspension joint is connected to the easy-drilling pipe . All the components of the cage connection device of the present invention are composed of easy-to-drill materials. On the premise that the strength meets the requirements for safely hanging the sand control pipe string, the screen pipe can be easily released after it is put in place, and can be quickly drilled through and broken by the PDC drill bit to continue drilling.

Description

technical field [0001] The invention relates to a cage connection device suitable for sand control or well wall support in fishbone branch wells and a method for using the same, belonging to the technical field of drilling and completion. Background technique [0002] Fishbone branch well is a technology that uses one main wellbore to drill multiple fishbone-shaped branch holes in the reservoir section, which can effectively improve the connectivity between oil and gas wells and reservoirs, and expand the drainage area of ​​a single well. An effective means to increase single well productivity. [0003] Sand production is a problem that must be solved during the development of oil and gas wells. If it is not handled properly, it will force the oil and gas well to reduce production, and even lead to the scrapping of the oil and gas well. The current sand control method is to build a mechanical or chemical sand retaining barrier in the wellbore. After the sand-containing flui...

AI Technical Summary

Problems solved by technology

As a result, the sand-containing fluid in the branch wellbore can only filter sand through the sand retaining barrier of the main branch wellbore, which increases the risk of blockage of the sand retaining barrier in the main branch wellbore

For unconsolidated reservoirs, the lateral wellbore without mechanical support will collapse after a period of production, resulting in the loss of productivity of the lateral wellbore

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