CN-224214129-U - Self-adaptive adjusting centralizer of screw drilling tool

CN224214129UCN 224214129 UCN224214129 UCN 224214129UCN-224214129-U

Abstract

The utility model discloses a self-adaptive adjusting centralizer of a screw drilling tool, which comprises a centralizer body, a connecting socket, a tail end socket and a locking screw. Through the concatenation mode of dovetail and dovetail boss, increase the connection socket, cooperation locking screw realizes the nimble regulation of centralizer external diameter. The centralizer has the advantages of simplicity and convenience in operation, strong adaptability, stable structure and the like, is suitable for wellbore operations of different sizes, and remarkably improves drilling efficiency and safety.

Inventors

WANG ZHENGSHENG
YU MINGMING
LI TAO
JIA YANJUN
Teng Rucheng
CHEN JUAN

Assignees

德州联合石油科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250630

Claims (7)

1. An adaptive adjustment centralizer of a screw drilling tool, which is characterized by comprising a centralizer body (1), at least one connecting socket (2), a tail end socket (3) and a locking screw (4); A plurality of centralizing ribs are circumferentially arranged on the centralizing body (1), dovetail bosses are arranged on the top surfaces of the centralizing ribs, an L-shaped groove (11) is formed in one side of the centralizing ribs, and a connecting hole is formed in one side wall of the L-shaped groove; The connecting sleeve joint (2) is of an arc-shaped structure, dovetail grooves and dovetail bosses are respectively arranged on the inner side and the outer side of the connecting sleeve joint, an L-shaped step (21) is arranged on the inner side of the connecting sleeve joint, an L-shaped groove is arranged on the outer side of the connecting sleeve joint, and a connecting hole matched with the L-shaped groove of the righting convex rib is formed in the L-shaped step; The tail end socket (3) is of an arc-shaped structure, a dovetail groove and an L-shaped step are formed in the inner side of the tail end socket, and a connecting hole is formed in one side wall of the L-shaped step; The centralizer body (1) is spliced between the centralizing convex edges and the connecting sleeve joints (2), between the connecting sleeve joints (2) or between the connecting sleeve joints (2) and the tail end sleeve joints (3) through the cooperation of the dovetail bosses and the dovetail grooves, and the spliced structure is fixed by screwing the locking screws (4) into the connecting holes after the L-shaped steps are positioned.
2. The self-adaptive adjusting centralizer according to claim 1, wherein the connecting hub (2) and the end hub (3) are both circular arc structures concentric with the centralizing rib of the centralizer body.
3. The self-adaptive adjusting centralizer according to claim 1, wherein the mating surfaces of the dovetail bosses and the dovetail grooves of the centralizer body (1), the connection hub (2) and the end hub (3) are provided with anti-slip patterns.
4. The adaptive adjustment centralizer of claim 3, wherein the anti-skid pattern is a zigzag or wave-like structure.
5. The self-adaptive adjusting centralizer according to claim 1, wherein at least two locking screws (4) are arranged at each joint between the centralizing lug and the connecting hub (2), between the connecting hub (2) or between the connecting hub (2) and the terminal hub (3), and the locking screws are arranged at intervals along the length direction of the centralizing lug.
6. The self-adaptive adjusting centralizer according to claim 5, characterized in that the head of the locking screw (4) is provided with a locking washer.
7. An adaptive centralizer according to claim 1, characterized in that the radial thickness of the connection hub (2) is provided with a plurality of dimensions.

Description

Self-adaptive adjusting centralizer of screw drilling tool Technical Field The utility model relates to the technical field of petroleum exploitation equipment, in particular to a self-adaptive adjusting centralizer of a screw drilling tool. Background In petroleum drilling operation, the centralizer of the screw drilling tool plays a vital role, and can ensure that the drilling tool keeps a central position in a borehole, reduce friction between the drilling tool and the borehole wall, improve drilling efficiency and ensure well quality. However, existing centralizers, such as the screw drilling tool centralizer disclosed in patent document CN201778682U, have the following significant drawbacks: The external diameter is fixed, the adaptability is poor, the external diameter of the conventional centralizer is fixed, and one centralizer can only adapt to a single borehole size. When the wellbore size changes or needs to be run in a wellbore of a different specification, the entire centralizer structure must be replaced, which not only increases the cost of the operation, but also reduces the drilling efficiency. And the replacement process of the conventional centralizer is complex, professional tools such as hoisting, dismounting and mounting, and more manpower are generally required, a great deal of time is consumed, the drilling operation progress is seriously affected, and the maintenance cost is high. Therefore, research and development of the centralizer structure with the outer diameter convenient to change has important significance for improving the applicability and the operation efficiency of the screw drilling tool. Disclosure of utility model Aiming at the problems and the defects in the prior art, the utility model provides a self-adaptive adjusting centralizer of a screw drilling tool. The technical scheme of the utility model is as follows: an adaptive adjustment centralizer for a screw drill comprises a centralizer body, at least one connecting socket, a tail end socket and a locking screw; A plurality of centralizing ribs are circumferentially arranged on the centralizing body, dovetail bosses are arranged on the top surfaces of the centralizing ribs, an L-shaped groove is formed in one side of the centralizing ribs, and a connecting hole is formed in one side wall of the L-shaped groove; the connecting sleeve joint is of an arc-shaped structure, a dovetail groove and a dovetail boss are respectively arranged on the inner side and the outer side of the connecting sleeve joint, an L-shaped step is arranged on the inner side of the connecting sleeve joint, an L-shaped groove is arranged on the outer side of the connecting sleeve joint, and a connecting hole matched with the L-shaped groove of the righting convex rib is formed in the L-shaped step; The tail end socket is of an arc-shaped structure, a dovetail groove and an L-shaped step are formed in the inner side of the tail end socket, and a connecting hole is formed in one side wall of the L-shaped step; The connection between the righting convex edge and the connection socket, the connection socket or the connection socket and the tail end socket of the righting device body are spliced through the cooperation of the dovetail boss and the dovetail groove, the spliced structure is fixed through the L-shaped step positioning and then the locking screw is screwed into the connection hole, and the self-adaptive adjustment of the outer diameter of the righting device is realized through increasing and decreasing the number of the connection sockets. Further, the connecting hub and the tail end hub are of circular arc structures with concentric centralizing ribs of the centralizer body. Further, the fit surfaces of the dovetail bosses of the centralizer body, the connecting hub and the tail end hub and the dovetail grooves are all provided with anti-skid patterns. Preferably, the anti-skid patterns are in a zigzag or wavy structure. Further, at least two locking screws are arranged at each joint between the centralizing rib and the connecting sleeve joint, between the connecting sleeve joints or between the connecting sleeve joint and the tail end sleeve joint, and the locking screws are arranged at intervals along the length direction of the centralizing rib. Preferably, the head of the locking screw is provided with a locking washer. Further, the radial thickness of the connection hub is provided with a plurality of dimensional specifications. The beneficial effects of the utility model are as follows: the number of the connecting sockets is increased or decreased, so that the outer diameter of the centralizer can be adjusted in a large range, the adaptability of the screw drilling tool to different borehole sizes is obviously improved, the centralizer is not required to be replaced frequently, and the operation cost is reduced. The splicing mode of the dovetail groove and the dovetail boss is adopted, and the quick locking mechanism is matche