Bi-or multi-modal particle size distribution to improve dragreduction polymer dissolution

A particle size distribution, polymer technology for lubricating compositions, drilling compositions, gas/liquid distribution and storage, which can solve problems that are not fully satisfactory

Inactive Publication Date: 2009-07-15
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these existing metho

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  • Bi-or multi-modal particle size distribution to improve dragreduction polymer dissolution
  • Bi-or multi-modal particle size distribution to improve dragreduction polymer dissolution

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[0018] Preparation of Slurries Containing Multimodal Particle Distributions

[0019] There are many different methods that can be used to prepare drag reducing polyolefin slurries. The multimodal particle size distribution compositions of the present invention are not necessarily limited to those discussed herein, but may include others. It should be understood that within the context of the present invention "multimodal" includes "bimodal". Some of the main methods and average particle size distributions for the preparation of DRA that will be discussed are given in Table I.

[0020] Table I

[0021] Average particle size distribution (microns) of some DRA prepared by different methods

[0022] A-precipitation / slurry B-Body / Ambient Grinding C-Body / homogenization D-Body / Cryogenic Grinding E-encapsulation 100-150

350-550

250-350

100-200

Microcapsules

150-5000

large capsule

>5000-15,000

[002...

Embodiment 1

[0059] Field trials were carried out on three different drag reducing formulations with different particle sizes. One product was a commercial sample prepared by the method of the precipitation technique described above (available from Baker Petrolite XLec drag reducing additive). The particle size or distribution of the product is 100-150 microns. The second commercial product tested was MXC drag reducing additive (available from Baker Petrolite), which is prepared by bulk polymerization followed by grinding technique on a Ross Mega-Shear homogenizer. The particle size of MXC products is 250-300 microns. The third formulation tested was XLec and A mixture of MXC products, combined at a polymer weight ratio of 2:3 (40wt% XLec Polymer: 60wt% MXC polymer), hereinafter referred to as MXA drag reducing additive. The resistance properties of the three products were tested in a 60 mile (97 km) long, 20" (51 cm) diameter pipeline carrying a specific gravity of ...

Embodiment 2

[0063] A second field trial was conducted using three of the above formulations in a 300 mile (482 km) long, 40" (102 cm) diameter pipeline carrying a specific gravity of 0.8 and a viscosity of 2.0 centistokes (2.0 x 10 -6 m 2 / s) crude oil. The temperature of crude oil is 75°F (24°C). The oil flow rate is 22,000 barrels per hour (about 3,500m 3per hour), corresponding to a Reynolds number of 570,000 and a line filling time of the pipeline of 5 days. The dose rates of the drag reducing composition injected into the pipeline are also qualitatively comparable. In the absence of frequent pressure sensors along the pipeline, the information gathered allows the generation of information related to overall performance relative to drag reducer content, rather than as figure 1 Performance with respect to distance as in . The actual performance in terms of drag reduction is: MXC is 43%, 46% for XLec, XA is 54%. XLec, MXC and The performance curves for MXA products ...

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Abstract

Drag reduction of hydrocarbon fluids flowing through pipelines of various lengths is improved by polyolefin drag reducer dispersions or dispersions using bi- or multi-modal particle size distributions. Drag reducers having larger particle sizes dissolve more slowly than drag reducers having smaller particle sizes. By using at least bi-modal particle size distributions drag reduction can be distributed more uniformly over the length of the pipeline where smaller sized particles dissolve sooner or earlier in the pipeline and larger sized particles dissolve later or further along the pipeline.

Description

technical field [0001] The present invention relates to methods of making and using polymeric drag reducers, and most particularly to methods of providing and using polymeric drag reducers that are more uniformly effective over time and / or distance. Background of the invention [0002] The use of poly(alpha-olefins) or copolymers thereof to reduce the resistance of hydrocarbons to flow through conduits and thus the energy requirements of such fluid hydrocarbon transport is well known. These drag reducing agents or DRAs have taken various forms in the past, including slurries or dispersions of ground polymers to form free flowing and pumpable mixtures in liquid media. The problem commonly experienced with simply grinding poly(alpha-olefin) (PAO) is that the particles will "cold flow" or stick together over time, thus making it impossible to grind poly(alpha-olefin) (PAO) in the form of The PAO is placed in the hydrocarbon where drag is to be reduced: with a suitable surface ...

Claims

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Application Information

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IPC IPC(8): C10M143/00F17D1/16C10M171/06C08J3/12
CPCF17D1/17F17D1/16C10L10/08C10N2230/00C10L1/1857C10L1/1973C10L1/1616C10L1/1641C10L1/1963C10L1/19C10L1/165C09K8/035C10L1/1826C10L1/1824C10L10/14C10L1/1852C10L1/207C10M143/00C10L1/10C10M171/06C10L2300/20C10N2030/00
Inventor J·R·哈里斯周陆建G·G·拉姆齐J·F·莫蒂尔N·S·科马雷迪T·马修
Owner BAKER HUGHES INC
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