| Customization: | Available |
|---|---|
| Type: | Core Drill |
| Usage: | Coring |
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Here are some more details about diamond reamers:
Reamer selection for wellbore enlargement: Diamond reamers are commonly used for wellbore enlargement purposes, such as in the process of underreaming. Underreaming involves enlarging the wellbore diameter beyond the original drill bit size to accommodate casing or other downhole equipment. Diamond reamers designed for underreaming applications typically have a larger diameter than the initial drill bit and may feature adjustable cutter arrangements to achieve the desired wellbore size.
Reamer design for hole cleaning: Effective hole cleaning is crucial during drilling operations to remove cuttings and maintain a clear wellbore. Diamond reamers can be designed with features that enhance hole cleaning, such as large junk slots, spiral blades, or strategically placed nozzles for fluid circulation. These design elements help prevent cuttings accumulation and ensure efficient cuttings transport to the surface.
Reamer customization for specific drilling methods: Diamond reamers can be customized to suit specific drilling methods. For example, in rotary drilling, where the bit rotates to create the borehole, reamers can be designed to work in conjunction with the rotary bit, optimizing drilling efficiency and hole quality. In contrast, in hammer drilling, where the bit pounds the rock to create the borehole, reamers can be tailored to handle the unique challenges of this drilling method, such as high impact forces and vibration.
Reamer compatibility with managed pressure drilling (MPD): Managed pressure drilling is a technique used to precisely control the downhole pressure during drilling, particularly in challenging formations or wellbore conditions. Diamond reamers can be designed to be compatible with MPD systems, allowing for accurate pressure management while maintaining efficient cutting performance.
Reamer selection for geothermal drilling: Geothermal drilling involves drilling wells to tap into geothermal energy reservoirs. Diamond reamers used in geothermal drilling must be capable of withstanding high temperatures and harsh downhole conditions. Additionally, the reamers should be designed to handle the specific geological formations encountered in geothermal reservoirs, which may differ from traditional oil and gas drilling formations.
Reamer design for wellbore stability: Maintaining wellbore stability is critical during drilling operations to prevent issues such as wellbore collapse or formation damage. Diamond reamers can be designed with stabilizer blades or features that help stabilize the wellbore by reducing vibration, minimizing hole deviation, and providing support to the wellbore walls.
Reamer selection for extended reach wells: Extended reach wells, also known as long-reach wells, involve drilling horizontally or at high angles over long distances. Diamond reamers used in extended reach drilling should be designed to handle the challenges associated with extended lateral sections, such as torque and drag, hole cleaning, and maintaining wellbore integrity.
Reamer customization for specific rock types: Different rock types have varying hardness, abrasiveness, and cutting characteristics. Diamond reamers can be customized to address the specific challenges posed by different rock types encountered during drilling. This customization may involve selecting the appropriate cutter materials, cutter configurations, or cutter densities to optimize cutting efficiency and tool longevity.
Reamer compatibility with casing running operations: Casing running involves the installation of casing strings into the wellbore. Diamond reamers should be compatible with casing running operations, enabling smooth passage through the casing and providing adequate clearance for the casing to be run to the desired depth.
Reamer design for reduced bit balling: Bit balling occurs when soft or sticky formations adhere to the drill bit, reducing drilling efficiency and potentially causing bit damage. Diamond reamers can be designed with features to minimize bit balling, such as specialized cutters or coatings that prevent the build-up of sticky materials on the bit.
These additional details shed light on the diverse applications, customization options, and compatibility considerations associated with diamond reamers in drilling operations. By tailoring the design and selection of diamond reamers to specific drilling challenges, operators can enhance drilling performance, improve wellbore quality, and maximize overall operational efficiency.
Q&A
Q1: Why is core drilling typically done before reaming?
A1: Core samples are taken first to analyze lithology, structures before enlarging the hole size. This ensures the proper reamer design, parameters and geologic targeting for subsequent operations.
Q2: What is back-reaming and when is it applied?
A2: Back-reaming involves using a reamer to slightly enlarge the lower section of the hole while withdrawing the drill string. It's used to ensure a smooth casing installation path when hole sizes fluctuate due to changing lithology.
Q3: How are multiple reaming runs staged for a single borehole?
A3: Reaming is often done in stages with sequentially larger reamers to gradually increase the hole diameter. Each reamer run cleans and clears cuttings while laying the path for the next larger size.
Q4: Why is borehole cleaning crucial for reaming?
A4: Cuttings must be efficiently flushed away to prevent re-cutting and premature bit balling/wear. Also critical for maintaining holestability and collecting representative cuttings/fluids samples.
Q5: What is the significance of bit balling during reaming?
A5: Bit balling occurs when cuttings adhere to the bit, clogging fluid ports and abrading the cutting structure prematurely. It dramatically reduces rate of penetration and requires cleaning the bit to resume operations. Certain lithologies and insufficient mud properties promote balling.
Model or type:
Specifications
| ITEM | DIAMOND BIT | Reaming shell | |||||
| "Q" Series Wireline assembly |
Size | Bit Outer Diameter | Bit Inner Diameter | ||||
| mm | inch | mm | inch | mm | inch | ||
| AQ | 47.60 | 1.88 | 26.97 | 1.06 | 48.00 | 1.89 | |
| BQ | 59.50 | 2.35 | 36.40 | 1.43 | 59.90 | 2.36 | |
| NQ | 75.30 | 2.97 | 47.60 | 1.88 | 75.70 | 2.98 | |
| HQ | 95.58 | 3.77 | 63.50 | 2.50 | 96.00 | 3.78 | |
| PQ | 122.00 | 4.80 | 84.96 | 3.35 | 122.60 | 4.83 | |
| Metric T2 Series | 36 | 36.0 | 1.417 | 22.0 | 0.866 | 36.3 | 1.429 |
| 46 | 46.0 | 1.811 | 32.0 | 1.260 | 46.3 | 1.823 | |
| 56 | 56.0 | 2.205 | 42.0 | 1.654 | 56.3 | 2.217 | |
| 66 | 66.0 | 2.598 | 52.0 | 2.047 | 66.3 | 2.610 | |
| 76 | 76.0 | 2.992 | 62.0 | 2.441 | 76.3 | 3.004 | |
| 86 | 86.0 | 3.386 | 72.0 | 2.835 | 86.3 | 3.398 | |
| 101 | 101.0 | 3.976 | 84.0 | 3.307 | 101.3 | 3.988 | |
T Series |
TAW | 47.6 | 1.875 | 23.2 | 1.31 | 48.0 | 1.89 |
| TBW | 59.5 | 2.345 | 44.9 | 1.77 | 59.9 | 2.36 | |
| TNW | 75.3 | 2.965 | 60.5 | 2.38 | 75.7 | 2.98 |
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| Reaming classification | |
| T series | T36,T46,T56,T66,T76,T86 |
| Cable series | AWL,BWL,NWL,HWL,PWL(Front end,rear end) |
| WT series | RWT,EWT,AWT,BWT,NWT,HWT(single tube/double tube) |
| T2/T series | T256,T266,T276,T286,T2101,T676,T686,T6101,T6116,T6131,T6146,T6H |
| WF series | HWF,PWF,SWF,UWF,ZWF |
| WG series | EWG,AWG,BWG,NWG,HWG(single tube/double tube) |
| WM series | EWM,AWM,BWM,NWM |
| Others | NMLC,HMLC,LTK48,LTK60,TBW,TNW,ATW,BTW,NTW,AQTK NXD3,NXC,T6H,SK6L146,TT46,TB56,TS116,CHD101 |
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