CN-122014229-A - High-precision dynamic continuous inclinometer while drilling

CN122014229ACN 122014229 ACN122014229 ACN 122014229ACN-122014229-A

Abstract

The invention belongs to the technical field of measurement while drilling, and discloses a high-precision dynamic continuous inclinometer while drilling. The device comprises a drill collar, a runner joint assembly, a probe assembly and a hard connection assembly, wherein the runner joint assembly, the probe assembly and the hard connection assembly are sequentially arranged in the drill collar and are sequentially connected. The probe assembly comprises a probe shell, a probe skeleton assembly and a quick-rotation structure assembly which are sequentially arranged in the probe shell, and the probe skeleton assembly and the quick-rotation structure assembly are connected in an opposite-insertion manner through a half-buckling structure. The probe skeleton assembly is provided with a main control power supply circuit board, an acquisition circuit board, three quartz flexible accelerometers which are orthogonal in pairs, a fluxgate processing circuit and a fluxgate sensor. The quick-rotation structure assembly comprises a shaft, a quick-rotation nut and a spiral shock absorber, wherein the upper end of the shaft is connected with the half-buckle adapter through the spiral shock absorber, the lower end of the shaft is sleeved with the quick-rotation nut, the nut is in threaded fit with the probe shell, and the shoulder of the shaft is pushed during rotation to drive the probe skeleton assembly to linearly move in the probe shell. The invention can realize high-precision and high-reliability dynamic continuous measurement under the complex drilling working condition.

Inventors

JIANG TIANJIE
Guan Guangxiao
GAO MINGHAO
LU HUATAO
WANG JIAOJIAO
QIN LU
ZHANG JIAWEI
LIU BAOSHENG

Assignees

中海油田服务股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (8)

1. A high-precision dynamic continuous inclinometer while drilling is characterized by comprising a drill collar (17), a runner joint assembly (300), a probe tube assembly and a hard connection assembly (400) which are sequentially arranged in the drill collar (17) and are sequentially connected, wherein the probe tube assembly comprises a probe tube shell (5) connected between the runner joint assembly (300) and the hard connection assembly (400), a probe tube skeleton assembly (100) sequentially arranged in the probe tube shell (5) and a quick rotation structure assembly (200) which is in opposite insertion connection with the probe tube skeleton assembly (100) through a half-buckling structure, the half-buckling structure comprises a half-buckling connection half-buckle (15) arranged at the rear end of the probe tube skeleton assembly (100) and a half-buckling adapter (25) arranged at the front end of the quick rotation structure assembly (200), wherein the quick rotation structure assembly comprises a plurality of grooves, The probe tube skeleton assembly (100) comprises a skeleton, a main control power supply circuit board (9) fixedly arranged on the skeleton, an acquisition circuit board (10), three quartz flexible accelerometers (11) which are arranged in a pairwise orthogonal mode, a fluxgate sensor (13) and a fluxgate processing circuit (12), the connecting half buckle (15) is arranged at the rear end of the skeleton, The quick-rotation structure assembly (200) comprises a shaft (1), a quick-rotation nut (2) and a spiral shock absorber (20), wherein the upper end of the shaft (1) is connected with the spiral shock absorber (20), the spiral shock absorber (20) is connected with the half-buckling adapter (25), the lower end of the shaft (1) is sleeved with the quick-rotation nut (2), the quick-rotation nut (2) is in threaded fit with the probe shell (5), and when the quick-rotation nut (2) is screwed, a shoulder of the shaft (1) is pushed to drive the probe skeleton assembly (100) to do linear motion in the probe shell (5); the drill collar (17) is characterized in that an anti-rotation ring (18) is fixedly arranged on the inner wall of the drill collar (17), a guide key is arranged on the anti-rotation ring (18), the runner joint assembly (300) comprises a runner joint body (36), the runner joint body (36) is provided with a key groove, and the guide key and the key groove are matched to form an opposite-plug structure, so that the probe tube assembly is circumferentially fixed in the drill collar (17); The runner joint assembly (300) further comprises a runner joint transition piece (37) which is in plug-in fit with the runner joint body (36), a lock nut (19) is arranged at one end, far away from the probe tube assembly, of the runner joint assembly (300), the lock nut (19) is in threaded connection with the inner wall of the drill collar (17) and is used for compressing the runner joint body (36) and realizing axial fixation of the probe tube assembly in the drill collar (17).
2. The high-precision dynamic continuous inclinometer while drilling as claimed in claim 1, wherein a grounding bead assembly (40) is mounted on the peripheral wall of the flow joint body (36), and the grounding bead assembly (40) is used for achieving shock absorption and electrical grounding of the flow joint assembly (300).
3. The high-precision dynamic continuous inclinometer while drilling as claimed in claim 1 or 2, wherein the fast rotation structure assembly (200) further comprises a gyro circuit board (23) fixedly mounted on the half-buckle adapter (25) and a gyro gland (22) for compacting the gyro circuit board (23), and the gyro circuit board (23) is a single-shaft MEMS gyro for measuring the rotation speed of a drill rod in a magnetically disturbed environment.
4. A high-precision dynamic continuous inclinometer according to claim 3, characterized in that the half-buckle adaptor (25) is further provided with an MDM15 core female plug (24), and the connecting half-buckle (15) is further provided with an MDM15 core male plug (14) for being inserted with the MDM15 core female plug (24) to realize electrical connection.
5. A high precision dynamic continuous inclinometer while drilling according to claim 3, wherein the quick-rotation structure assembly (200) further comprises a spacer (3) and a tightening screw (4), the spacer (3) being sleeved at the end of the shaft (1) and locked by the tightening screw (4) for limiting the axial displacement of the quick-rotation nut (2) when it is screwed.
6. The high-precision dynamic continuous inclinometer while drilling according to claim 1 or 2, wherein an anti-surge circuit (16) is connected between the probe skeleton assembly (100) and the runner joint assembly (300), and the anti-surge circuit (16) is electrically connected with the main control power supply circuit board (9) and is used for preventing transient voltage from damaging the circuit.
7. The high-precision dynamic continuous inclinometer while drilling as claimed in claim 1 or 2, wherein the probe assembly further comprises a plurality of centralizers (33) axially spaced around the periphery of the probe housing (5), the centralizers (33) being in contact with the inner wall of the drill collar (17) for supporting the probe assembly.
8. The high-precision dynamic continuous inclinometer while drilling according to claim 1 or 2, wherein a plurality of damping O-ring groups (48) are sleeved on the outer circumference of the probe skeleton assembly (100) at intervals in the axial direction, the damping O-ring groups (48) are elastically contacted with the inner wall of the probe shell (5) and are used for realizing radial damping of the probe skeleton assembly (100), a locking nut (6) and a locking O-ring (7) are arranged at one end, close to the flow passage joint assembly, of the probe shell, the locking O-ring (7) is sleeved at the end part of the probe skeleton assembly (100), and the locking O-ring (7) is protruded under the extrusion of the locking nut (6) and is contacted with the probe shell (5) by tightening a screw on the locking nut (6) to enable the locking O-ring (100) to be locked with the end part of the probe skeleton assembly (100) in the probe shell (5).

Description

High-precision dynamic continuous inclinometer while drilling Technical Field The invention relates to the technical field of measurement while drilling, in particular to a high-precision dynamic continuous inclinometer while drilling. Background Measurement while drilling (WHILE DRILLING, MWD) technology is one of the core technologies of modern drilling operations for measuring downhole parameters, such as well inclination, azimuth, toolface angle, etc., in real time during drilling to achieve precise control and geosteering of the wellbore trajectory. The measurement accuracy, reliability and operation efficiency of the inclinometer while drilling are key components of an MWD system, and directly influence the drilling safety, economy and final oil and gas recovery ratio. The prior art mainly adopts the following technical scheme that 1) the prior drill collar structure is that in the prior art, the drill collar is usually provided with a slotting, wire passing hole or gun drilling structure to realize the arrangement of an internal cable, and connecting wires are required to be connected through a wire protection tube or a special channel outside the drill collar, so that the structure is complex and the sealing performance is poor. 2) The probe tube supporting mode is that the existing probe tube assembly is supported in the drill collar generally by adopting a simple centralizer structure, and the probe tube easily rotates circumferentially in the drill collar, so that the measurement accuracy is affected. Part of the prior art adopts a key slot matching or pin fixing mode, but the installation is complex and the reliability is low. 3) The flow passage joint structure is characterized in that the existing flow passage joint is of an integral structure, so that the processing difficulty is high, the processing time is long, the processing cost is high, the integration level of grounding and damping functions is low, the slurry sealing performance is insufficient, and the underground slurry is easy to invade an electric connection part to cause short circuit or signal interference. 4) When the existing probe skeleton is installed into the probe shell, a direct pushing or rotating installation mode is generally adopted, and a large friction moment is generated between a damping O ring on the probe skeleton and the inner wall of the probe shell, so that the damping O ring is seriously worn, and the spiral damper bears additional torsional stress to influence the service life and the measurement reliability. 5) The sensor is configured in such a way that the conventional inclinometer mostly adopts the combination of a triaxial accelerometer and a triaxial fluxgate, the azimuth measurement precision is seriously affected in the environment with magnetic interference (such as near ferromagnetic materials such as drill collars and casings), and the conventional inclinometer can measure the rotation speed of a drill rod by using the fluxgate sensor, but has large magnetic interference in a non-measurement area, so that dynamic measurement is limited. The prior art has the main defects that firstly, the drill collar is complex in structure, the structure strength of the drill collar is weakened by a grooving, wire passing hole and gun drilling structure, external wiring is easily damaged by underground severe environment, and sealing reliability is poor. Secondly, the anti-rotation effect is poor, the existing anti-rotation structure is complex, the installation is difficult, the requirement on the matching precision of an anti-rotation ring and a drill collar is high, looseness is easy to occur in a downhole vibration environment, the circumferential movement of a probe tube is caused, and the measurement accuracy is affected. Thirdly, the slurry sealing performance is poor, the integral runner joint is difficult to simultaneously meet multiple requirements of shock absorption, grounding and sealing, and the slurry easily invades the electric connection part to cause equipment failure. Fourth, the difficulty of installing the probe tube is that the direct pushing or rotating installation mode causes the shock absorption O ring and the spiral shock absorber to bear additional friction force and torsion moment, so that abrasion is accelerated, and reliability and service life are reduced. Fifth, the traditional fluxgate sensor has weak anti-magnetic interference capability, the measurement accuracy of the traditional fluxgate sensor is reduced in the magnetic interference environment, the rotation speed of a drill rod cannot be measured, and the application of dynamic continuous measurement is limited. Sixth, the internal locking is unreliable, and the existing locking structure is easy to loosen under the high-pressure, high-temperature and strong-vibration environments in the pit, so that the probe tube axially moves, and the measurement stability is affected. Disclosure of Invention In view of the problems ex