Highly reinforced elastomer for use in downhole stators
a technology of elastomer and elastomer, which is applied in the direction of machines/engines, mechanical equipment, liquid fuel engines, etc., can solve the problems of prolonging the service life of the stator, and achieve the effects of improving torque output, improving efficiency, and increasing manufacturing costs
Inactive Publication Date: 2008-02-28
DYNA DRILL TECH
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Benefits of technology
[0014]Exemplary embodiments of the present invention advantageously provide several technical advantages. For example, exemplary embodiments of the invention advantageously reduce the above described tradeoffs associated with elastomer material selection (in particular in regard to resilience and processability). As such, stators in accordance with this invention may exhibit improved efficiency (and may thus provide improved torque output) as compared with conventional stators without substantially increasing manufacturing costs. Moreover, stators in accordance with this invention may provide comparable torque output with stators including rigid metallic lobes, but at significantly reduced expense. An additional benefit of exemplary embodiments of the invention is higher temperature capability due to reduced internal heat generation in the center of the lobe. Reduced heat generation also tends to reduce elastomer breakdown in the lobes and thereby prolong service life of the stator.
Problems solved by technology
Reduced heat generation also tends to reduce elastomer breakdown in the lobes and thereby prolong service life of the stator.
Method used
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Embodiment Construction
[0023]As described above, conventional Moineau drilling motors have used an elastomeric helical cavity component bonded to a steel housing. However, due to the behavior of the selected elastomer material in various competing conditions, there have been inevitable tradeoffs in the choice of a desired elastomer material. Such tradeoffs typically result in the selected elastomer having at least one less-than-optimal material property (e.g., lower-than-desired resilience, suboptimal processability, and / or inadequate dynamic properties) and as described above, these tradeoffs tend to compromise various stator fabrication and / or performance metrics.
[0024]Lower than desired elastomer resilience results in inadequate torque transmission. As described above, elastomeric materials with insufficient resilience undergo excessive deformation at high torque loads (due to the low rigidity of the elastomer), which allows drilling fluid to pass from one cavity to the next without producing any work....
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Abstract
A Moineau stator for a downhole drilling motor and a method for fabricating the stator are disclosed. The stator includes an internal helical cavity component fabricated from an improved elastomeric material formulated to provide both high resilience and good processability. For example, in one exemplary embodiment the elastomer material includes rheological parameters ML in a range from about 1.0 to about 4.0 lb·in and MH in a range from about 75 to about 110 lb·in according to ASTM D2084 at 380 degrees F. Stators in accordance with this invention may exhibit improved efficiency (and may thus provide improved torque output) as compared with conventional stators without substantially increasing manufacturing costs.
Description
RELATED APPLICATIONS[0001]None.FIELD OF THE INVENTION[0002]This invention relates generally to Moineau style power sections useful in subterranean drilling motors, and more specifically relates a drilling motor including an improved elastomer material.BACKGROUND OF THE INVENTION[0003]Moineau style hydraulic motors and pumps are conventional in subterranean drilling and artificial lift applications, such as for oil and / or gas exploration. Such motors make use of hydraulic power from drilling fluid to provide torque and rotary power, for example, to a drill bit assembly. While downhole drilling motors fall into the general category of Moineau-type motors, they are generally subject to greater working loads, temperatures, and more severe chemical and abrasive environments than Moineau motors and pumps used for other applications. As such, the demands on drilling motor components (rotor and stator components) typically far exceed the demands on the components of other Moineau-type motor...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F01C5/00F01C1/10
CPCE21B4/02F05C2225/02F04C2/1075
Inventor HOOPER, MICHAEL
Owner DYNA DRILL TECH