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CN-121993024-A - Screw drilling tool motor stator, screw drilling tool motor and forming method

CN121993024ACN 121993024 ACN121993024 ACN 121993024ACN-121993024-A

Abstract

The invention relates to the field of petroleum and natural gas drilling tools, in particular to a screw drilling tool motor stator, a screw drilling tool motor and a forming method, wherein the screw drilling tool motor stator comprises a stator body, a rubber bushing is arranged on the inner wall of the stator body, a first spiral structure is arranged on the inner surface of the rubber bushing, a sheath is arranged at two ends of the rubber bushing in the stator body, the outer surface of the sheath is fixedly connected with the stator body, and a second spiral structure is arranged on the inner surface of the sheath, wherein the spiral line type of the first spiral structure is identical to the spiral line type of the second spiral structure. The motor stator is provided with the second thread surface on the inner surface of the sheath, so that the speed and the flow of drilling fluid passing through the motor stator can be increased on the basis of protecting the rubber bushing, and the motor stator has the advantage of improving the descending efficiency of the drilling fluid.

Inventors

  • ZHAO YUJUN
  • SONG JIAN
  • MI KAIFU
  • LUO XICHAO
  • YU XINGSHENG
  • GUO TIANMING
  • SUN XIAOLIANG
  • WANG XINGKUN
  • LI MINGYIN

Assignees

  • 中国石油天然气集团有限公司
  • 北京石油机械有限公司
  • 中国石油集团昆仑制造有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (10)

  1. 1. The screw drill motor stator comprises a stator body (10), wherein a rubber bushing (20) is arranged on the inner wall of the stator body (10), and a first spiral structure is arranged on the inner surface of the rubber bushing (20), and the screw drill motor stator is characterized in that in the stator body (10), jackets (30) are arranged at two ends of the rubber bushing (20), the outer surface of the jacket (30) is fixedly connected with the stator body (10), and a second spiral structure is arranged on the inner surface of the jacket (30); wherein the helix of the first helix is the same as the helix of the second helix.
  2. 2. The progressive cavity drilling tool motor stator according to claim 1, wherein the axial length of the sheath (30) is 50-150 mm, and the radial thickness difference between the sheath (30) and the rubber bushing (20) is-0.2-0 mm.
  3. 3. A progressive cavity drill motor stator according to claim 2, characterized in that the end of the inner surface of the rubber bushing (20) is provided with a chamfer.
  4. 4. The progressive cavity drilling tool motor stator according to claim 1, wherein the sheath (30) is made of a temperature-resistant wear-resistant high-elastic modulus material; The highest temperature resistance of the temperature-resistant wear-resistant high-elastic modulus material is 250 ℃, the friction coefficient range is 0.1-0.4, and the elastic modulus range is 3 GPa-150 GPa.
  5. 5. The progressive cavity drilling tool motor stator of claim 4 wherein the temperature and wear resistant high modulus of elasticity material comprises polyimide, polyetheretherketone or metal rings.
  6. 6. A progressive cavity drill motor stator according to claim 1, wherein the surface of the sheath (30) is spray coated.
  7. 7. A progressive cavity drill motor comprising a rotor and a progressive cavity drill motor stator as claimed in any one of claims 1 to 6, the outer surface of the rotor being provided with a helical surface, the rotor being interposed within the progressive cavity drill motor stator.
  8. 8. A method of forming a stator for a progressive cavity drilling tool motor, the method comprising the steps of: Obtaining a preformed stator body (10), a rubber bushing (20) and a sheath (30); -fixing said rubber bushing (20) and said sheath (30) inside said stator body (10) obtaining a progressive cavity drilling motor stator according to any one of claims 1-6.
  9. 9. The method of forming a progressive cavity drilling tool motor stator according to claim 8, wherein the pre-forming process of the jacket (30) comprises: Preparing, namely selecting a machine tool, preparing a cutter, preparing a bar blank of a sheath (30), and finishing the relative position and fixation of the cutter and the blank; Programming and inputting, namely programming and processing programs and parameters of the sheath (30) according to the inner cavity size of the stator body (10) and the spiral line type of the first spiral structure of the rubber bushing (20), and inputting the programs and parameters into a machine tool system; Machining the spiral surface, namely finishing the second spiral structure machining of the sheath (30) by adopting rough machining, semi-finishing and finishing; and (3) processing the outer circle to finish the outer circle size, surface roughening and activation processing of the sheath (30).
  10. 10. A method of forming a progressive cavity drilling tool motor stator according to claim 8, characterized in that the sheath (30) is connected to the stator body (10) by means of an adhesive or mechanical fastening.

Description

Screw drilling tool motor stator, screw drilling tool motor and forming method Technical Field The invention belongs to the field of petroleum and natural gas drilling tools, and particularly relates to a screw drilling tool motor stator, a screw drilling tool motor and a forming method. Background The screw drilling tool is a volumetric underground power tool which uses drilling fluid as a power source and converts hydraulic energy into mechanical energy, and has the advantages of simple structure, reliable operation, wide rotating speed and torque application range, high drilling efficiency and the like, thereby being widely applied to drilling engineering of petroleum, natural gas and the like. As the power core of the screw drilling tool, the motor stator plays a leading role in the aspects of performance, efficiency, adaptability, innovation, reliability and the like, and with the complex and changeable market environment, oilfield clients put forward higher requirements on the aspects of stator optimal design, rubber performance improvement, reliability improvement and the like, so that the rapid omnibearing development of stator innovation is promoted. The Chinese patent application CN116181221A discloses a screw drilling tool resistant to erosion of sand-containing slurry, which comprises a motor assembly and a transmission shaft assembly, wherein the motor assembly comprises a stator and a rotor, a rubber bushing is fixedly arranged on the inner wall of the stator, the rotor is of an axial hollow structure, the inner surface of the rubber bushing and the outer surface of the rotor are spiral surfaces, and centralizing sleeves are arranged on the inner walls of the stators at the two ends of the rubber bushing, so that the erosion resistance of the motor stator and the transmission shaft is improved, and the service life of the motor stator and the transmission shaft can be kept longer under severe drilling working conditions. However, the structure has low efficiency of descending drilling fluid in the screw drilling tool due to the fact that the sleeves are arranged and righted at the two ends of the rubber bushing. In view of this, the present invention has been made. Disclosure of Invention In order to solve the technical problems in the prior art, the invention provides a screw drilling tool motor stator, a screw drilling tool motor and a forming method, wherein the motor stator is provided with a second thread surface on the inner surface of a sheath, and the speed and the flow of drilling fluid passing through the motor stator can be increased on the basis of protecting a rubber bushing, so that the invention has the advantage of improving the descending efficiency of the drilling fluid. The invention comprises the following technical scheme: The invention provides a screw drill motor stator, which comprises a stator body, wherein a rubber bushing is arranged on the inner wall of the stator body, a first spiral structure is arranged on the inner surface of the rubber bushing, a sheath is arranged at two ends of the rubber bushing in the stator body, the outer surface of the sheath is fixedly connected with the stator body, and a second spiral structure is arranged on the inner surface of the sheath; wherein the helix of the first helix is the same as the helix of the second helix. Further, the axial length of the sheath is 50 mm-150 mm, and the difference value between the radial thickness of the sheath and the radial thickness of the rubber bushing is-0.2 mm-0 mm. Further the end of the inner surface of the rubber bushing is provided with a chamfer. The sheath is made of a temperature-resistant wear-resistant high-elasticity modulus material; The highest temperature resistance of the temperature-resistant wear-resistant high-elastic modulus material is 250 ℃, the friction coefficient range is 0.1-0.4, and the elastic modulus range is 3 GPa-150 GPa. Further, the high elastic modulus material with temperature resistance and wear resistance comprises polyimide, polyether-ether-ketone or metal rings. Further, the surface of the sheath is subjected to spray coating treatment. The invention provides a screw drill motor, which comprises a rotor and the screw drill motor stator, wherein the outer surface of the rotor is provided with a spiral surface, and the rotor is inserted into the screw drill motor stator. The third aspect of the invention provides a molding method of a screw drilling tool motor stator, comprising the following steps: obtaining a preformed stator body, a rubber bushing and a sheath; the screw drill motor stator as described above is obtained by fixing the rubber bushing and the sheath in the stator body. Further, the preforming process of the sheath comprises the following steps: preparing, namely selecting a machine tool, preparing a cutter, preparing a bar blank of the sheath, and finishing the relative position and fixation of the cutter and the blank; Programming and inputt