Well wall mud cake scraping tool and method for open hole well

Abstract

The invention relates to a well wall mud cake scraping tool and method for an open hole well. According to the technical scheme, a rigid centralizer body short joint, a mud cake scraping steel wire short joint and a ball centralizer body short joint are of independent structures and can be freely combined and connected through screw threads; the inner drift diameter of the tool is consistent with the inner diameter of a well completion sleeve, and an upper connector and a lower connector are connected with the sleeve; the mud cake scraping steel wire short joint is in interference fit with a well hole, steel wires are linearly arranged, and circulating fluid can flow through channels between all the rows of the steel wires. The well wall mud cake scraping device and method have the advantages that the steel wires and the well hole are in interference fit, and a mud cake structure can be effectively damaged; a rigid centralizer and a ball centralizer on the upper portion and the lower portion of the tool cooperate, so that the centralizing degree of the sleeve of the tool is guaranteed; by means of the passageway structure of the tool, circulating flowing of the fluid is guaranteed. In a word, the tool can achieve effective removal of irregular well hole mud cakes and guarantee normal circulation of mud, flushing liquid, cement slurry and other well entering liquid, and therefore the mud cake flushing efficiency and the well cementation two-interface cementing strength are improved.

Description

technical field [0001] The invention relates to a petroleum well completion tool and method, in particular to a well wall mud cake scraping tool and method for open hole wells. Background technique [0002] Mud cake is a solid phase deposit deposited on the well wall or formation during the drilling fluid filtration process. This deposit is conducive to balancing the bottom hole pressure during the drilling process, has certain lubricity, and can play a safe and fast The role of drilling. However, when the casing or open hole is completed, the formed mud cake not only blocks the oil and gas pore channels in the formation, but also forms a barrier inside the wellbore, thereby reducing the bonding strength between the cement stone and the formation, which is not conducive to the improvement of cementing quality . [0003] Clearing the drilling fluid mud cake of oil and water wells is an important work related to displacement efficiency and cementing quality. At present, the...

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Problems solved by technology

[0008] ② Due to the need to apply extended reach wells and horizontal wells, it must have the function of casing straightening;

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