Small Diameter Measurement While Drilling

ER-MWD38 (0–180°/±0.1° MWD-Φ38mm);
3.Tool Face Angle:0–360°/±2;

Product Details

Small Diameter Measurement While Drilling (MWD-Φ38mm)

ER-MWD38S Measurement While Drilling (MWD)

Introduction :

Small Diameter Measurement While Drilling (MWD-Φ38mm) is a kind of small-path mud pulse wireless in-drilling inclinometer. This is a new product developed following the ER-MWD48 Measurement While Drilling . This product not only inherited the characteristics of high precision, high stability and high vibration resistance of the ER-MWD48inclinometer, but also more extensive applications.


1.ER-MWD38S Measurement While Drilling can be used for the construction of conventional wellbore like the ER-MWD48 Measurement While Drilling . Different diameters can be selected according to the conditions of on-site drilling tools (diameter of the drill collar Ф50.8mm, Ф71.4mm) Rubber wings to suit different drilling tools.
2.The external diameter of the instrument is Ф38mm. In the construction of small wellbore, the hole of the non-magnetic drilling tool may not be reamed (diameter of the drill collar is Ф50.8mm), which reduces the erosion of the drilling tool and enhances the safety of the downhole drilling tool.
3.When used in conventional large borehole construction, the muddy water circulation area of the non-magnetic drill collar is relatively increased, erosion of the drilling equipment and drilling tool is reduced, and the safety construction of the well team is facilitated.
4.It is more suitable for the second and third development of oil wells and small hole operations such as window sidetrack drilling. Also suitable for use with coiled tubing to connect MWD.
5.The underground electrical connection adopts self-locking air plug + cord connection, which makes the instrument connection convenient and reliable, and improves the reliability of the instrument.
6.The electronic chamber of the pulse generator and the gamma probe share a compression cylinder. The user can select conventional gamma or orientation gamma. Became one of the first manufacturers in China to use the Ф38mm outer diameter directional gamma wireless MWD system.
7.ER-MWD48 and ER-MWD38S are compatible with ground equipment, reducing the cost of using.
8.Ground equipment can be selected for wireless or wired transmission.



Measuring range & accuracy


0   – 180°/±0.1°


0   – 360°/±1°

Tool Face Angle

0   – 360°/±2°

Pulse Type

Positive   pulse


The gamma probe is integrated in the  pulsar and is approximately

1500mm closer to the drill than the conventional   gamma short 

section (optional gamma orientation)

Operating Temperature


Mud Displacement


Outside Diameter

38.1mm/1.5”(Pulse   section-48mm/1.875”)

Downhole Power Supply

Lithium battery 21-28.8V DC(Can   connect two battery segments)

Battery Life

Single   battery more than 1300 hours

Impact Resistance

1000g,   0.5msec(Half shaft sine wave)                 


20g   RMS 15-500Hz

Pressure Tube

100   MPa

Temperature Limit

0℃ - 125℃

Total Length of Downhole Tool String 

6.0m(No gamma) ; 6.7m(With gamma)

Instrument Pressure Drop                 


Mud Sediment Content


Mud Weight

≤2.2   g/cm3

Mud Viscosity (Funnel Viscosity)


Mud Signal Strength


Adaptable to DrillCollar



1. What is your quotation condition?

If you have DHL or Fedex account ,we can quote EXW price ,otherwise CIF or FOB price.

2.Do you have any discount when procurement? 

We will quote sample price at first and we will quote volume price if you need more quantity.

3.How long is the delivery time?

For sensors,parts,modules : in stock-one week;no stock-2-4weeks; For systems,generally ,8-12 weeks.

4.How to deal with the quality problems?

If confirmation of product quality problem we can replace it freely for customer in the shortest period.

If interested in Small Diameter Measurement While Drilling (MWD-Φ38mm), pls contact us :

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