Latest Technology Equidistant Power Section Increases Overall Performance of a Workover Motor

Hazenberg, Frans; Regener, Thorsten

doi:10.2118/74825-ms

Cited by 4 publications

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“…The technology increases the sealing pressure from the original 0.8MPa by 50% to 100% at each level, in the same torques it can shorten the length of the stator and increase its life expectancy as well [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

FEA of Stator of the Equal Wall Thickness of the Multi-thread Screw Drilling Tool

Wang

Chen

Sun

2010

2010 International Conference on Measuring Technology and Mechatronics Automation

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Two-dimensional planar modeling of stator of both traditional Screw drilling tool and the equal wall thickness of rubber of Screw drilling tool is set up with the 3D design software. Finite element analyzing modeling is set up as well, at uniformity pressure of inner surface of the stator rubber, regularities of distribution of the stress, the strain and the displacement are analyzed. And the results show that in the same pressure the equal wall thickness bush has a better antideformation capacity than traditional bush, in the same amount of interference, the equal wall thickness bush have a better sealed capacity. In the same torque, the length of equal wall thickness stator of screw drill can be shortened, the changes of the relative displacement of equal wall thickness of rubber bush inner surface is small, which makes uniformity interference fit between the rotor and the stator, and enhances screw drill's working performance.

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Section: Introductionmentioning

confidence: 99%

FEA of Stator of the Equal Wall Thickness of the Multi-thread Screw Drilling Tool

Wang

Chen

Sun

2010

2010 International Conference on Measuring Technology and Mechatronics Automation

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Coiled-Tubing-Conveyed Hydromechanical Pipe Cutting Enables Removable Packer Completions

et al. 2003

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Traditionally, completion engineers have faced a dilemma when deciding whether to run a large-bore, hydraulically set, permanent or retrievable packer completion. Thanks to advances in cutting technology, this decision is no longer an either/or proposition. The innovative alternative which has been enabled by through-tubing cutting technology is the removable packer completion. Combining a through-tubing-conveyed hydromechanical cutter with a "cut-to-retrieve" packer had never previously been attempted. In addition to providing an innovative solution for difficult service environments, the new capabilities gained by combining these technologies has led to the development of a work-string-conveyed method of cutting and retrieving the packer, thus enlarging the scope of viable applications for the removable packer completion. This paper will review the removable packer completion and the coiled-tubing-conveyed hydromechanical pipe cutting system and describe in detail how the technology was proven, both in the laboratory and at the rig, and how it is being used to design and complete wells in Alaska and Kazakhstan. Introduction The increased use of coiled tubing in the last twenty years has led to many technological advances in through-tubing workover operations such as fishing, impact services, milling, underreaming and hydromechanical pipe cutting systems. Because these operations are often performed to solve unforeseen problems, traditionally they have not been planned for during the completion design phase. As a result, challenges and restrictions placed on through-tubing tools and equipment can complicate through-tubing workover operations and add to their cost. Although the "cut-to-retrieve" feature of the removable packer may still be considered a contingency application, the due consideration and planning afforded the hydromechanical pipe cutting system at the completion design stage has effectively repositioned this through-tubing workover application from an "afterthought" to an extremely reliable and effective enabling technology. Removable Packer The removable packer was developed to offer large inside diameter, high performance and design simplicity missing from retrievable packers. The removable packer is retrieved by cutting the packer mandrel and picking up on the tubing. The packer and its tailpipe can then be removed from the well without the need to mill over the packer. (It should be noted, however, that since the mandrel is cut, redressing and re-running the packer will, in all likelihood, be uneconomical.) The cut-to-remove concept is based on the premise that the cross-section of the packer's cut zone is similar to that of the production tubing. Thus, existing through-tubing cutting technology can be used to cut the mandrel of the removable packer. The primary challenges were to establish a method of locating the cut region and optimizing the original hydromechanical pipe cutter design for this application. Existing location methods were established and are described in this paper. Optimizing the cutter design included controlling the depth of the cut, which was deemed a critical issue. If the cutter severs the mandrel and the outer housing, the removable packer will not be capable of removing the lower half of the packer and the tailpipe. (Figure 1) For the removable packer concept to be viable, operators requested multiple retrieving scenarios. Four were developed:Coiled-tubing conveyed hydromechanical cutterWorkstring-conveyed hydromechanical cutterStandard milling methodChemical cut method All four systems were designed and validated for use. (Figure 2)

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New Performance Motors Set New Benchmarks in Drilling Performance

et al. 2003

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The elastomer and its bonding system has always been the one of the most critical areas in downhole motor design. The elastomer's physical properties change due to temperature or from reactions with certain chemicals commonly used in drilling applications. This limits both the motor's operational temperature range and the chemicals that can be used in the mud system. While drilling with a conventional motor, heat is concentrated in a regular elastomer power section's lobes forming hot spots which contribute to a premature heat aging of the elastomer. Today, however, a new manufacturing process for stator tubes permits the forging of a pre-contoured lobe configuration - significantly reducing the elastomer content in the power section. This new design broadens motor capabilities by allowing heat to radiate faster from the thin elastomer and significantly improving the motor's mechanical and volumetric efficiency. The power output of all sizes of positive displacement downhole motors has more than tripled during the past fifteen years. For example, today's 4–3/4" motors are significantly stronger than the 9–1/2" motors built in the 1980's. The latest step change in motor power was achieved in the manufacturing processes that eliminated 60%–80% of the elastomer used in the power section's stator. These latest generation downhole motors are used as performance motors - delivering over 50% more power output compared to the previous generation motors of the same length and diameter and permitting the operator to select more aggressive bit designs. As a result, operators have experienced Rates of Penetration (ROP) improvements of 100%–300%. In addition, high speed configurations with bit speeds up to 1200 RPM are used in hard and abrasive formations with temperatures up to 160°C (320°F). These configurations outperform previously used turbines where the motors have greater torque capabilities while maintaining full steerability throughout the entire run. Typical performance drilling applications cover re-entry, deepwater and extended reach wells in all parts of the world. This paper describes the technical features of the latest generation downhole motors in detail and documents their capabilities with case histories from various worldwide applications. Introduction Since the commercial introduction of hydrostatic downhole motors to the oil and gas industry in the 1970's, development engineers have worked on the increase of reliability and power output of these systems. Today downhole motors are among the most reliable components in the BHA - providing rotary power to the bit and keeping the well on the desired wellpath. Due to the development of improved manufacturing processes, better materials, and the application of latest design and simulation software, the power output of these downhole motors has increased steadily. Figure 1 shows the development in power output for three typical tool sizes during the past 20 years. Power sections are available asHigh-speed power sections for applications with impregnated bits,High-torque power sections for PDC bit applicationsLow-speed power sections for roller cone bit applications The latest generation of high-performance motors delivers up to twice the power of previous generation motors and was developed specifically for challenging performance drilling applications. The rugged design reduces the number of thread connections and includes strengthened thread connections to prevent tool failures, high load axial and radial bearings for the use of greater weight-on-bit and faster penetration rates and an improved steering head for more precise directional control.

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Latest Technology Equidistant Power Section Increases Overall Performance of a Workover Motor

Cited by 4 publications

References 0 publications

FEA of Stator of the Equal Wall Thickness of the Multi-thread Screw Drilling Tool

FEA of Stator of the Equal Wall Thickness of the Multi-thread Screw Drilling Tool

Coiled-Tubing-Conveyed Hydromechanical Pipe Cutting Enables Removable Packer Completions

New Performance Motors Set New Benchmarks in Drilling Performance

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