New Type Piston Balanced Pulse Generator

SG-48 The piston balanced new pulse generator is developed based on the on-site conditions and requirements of domestic drilling, and is an upgraded product of the commonly used mud positive pulse signal generator. It can be directly exchanged with QDT and YST-48R MWD pulse generators to improve the performance of existing instruments. The schematic diagram of the structure is shown in the figure:

1. Designed a new screening cylinder. Replacing the commonly used screening cylinder, compensating outer cylinder, and outer cylinder, the overcurrent mode of the three screening screens has been eliminated, making the structure of the new pulse integrated. A new titanium steel cylinder grate screen has been designed, using a circular sieve tube for flow passage, making the outer surface of the new pulse generator streamlined, effectively controlling the generation of mud eddies, improving mud channels, making mud flow more reasonable, and reducing mud erosion on the instrument. Enhanced wear resistance, extended service life, and reduced maintenance costs.
2. Designed a built-in balance piston. Replacing commonly used compensation membranes and bellows, using a piston for pressure compensation which improves the reliability of the pulse generator. Extended the maintenance cycle from 600 hours to 800-1000 hours, making it more suitable for deep well operations.
3. Power saving. We have designed new driving (excitation) and fully electronic driving power supply modes, which have extended the battery power supply time. The single battery has increased from 160 hours to 260 hours.
4. A new valve stem return mechanism has been designed, simplifying the original spring rod mechanism. Make the new pulse generator work more stably.
5. Through the above design improvements, the length of the pulse generator has been shortened, making the gamma probe closer to the drill bit, simplifying the structure, reducing the number of vulnerable parts, improving the service life, extending the working time and maintenance time, and reducing production costs.

The first step involves six steps, including inspection and basic cleaning of the underground section. After each assignment, these six steps must be checked first.

1. Main components

2. Check the silicone oil

3. Disassembly

4. Cleaning

5. Debugging

6. Assembly

1. Main components

2. Check the silicone oil:

2.1

Remove the external thread protector from the connecting sleeve

Insert the adjuster into the connecting sleeve

Rotate counterclockwise until completely removed

2.2

Adjustment rod, adjuster is used to lock the inside of the adjustment rod

Twist in the adjustment rod by turning the rolling handle

Pull out the adjustment rod

2.3

Insert the compensating piston rod into the sieve cylinder

Twist to fixed position

Insert the compensating piston rod into the pulse to the 0.00 position. If it is lower than this position, replenish the oil and replace the sealing gasket in a timely manner.

3. Disassembly

3.1

Remove the O-ring from the adjustment rod.

Loosen the connecting sleeve on the screen sieve with friction pliers or pipe pliers

Remove the connecting sleeve

Remove the first O-ring

Remove the second O-ring

Remove the screen sieve pad

Remove the screen sieve

4.Cleaning

4.1 Clean all areas with a brush and clean water

Brush the outer surface part of the sieving cylinder

Flush the outer surface of the sieving cylinder

Flush the inside of the sieving cylinder with water

Observe the inside of the sieve cylinder to ensure that there are no gravel left

Note: The above figure shows a clearly visible compensating piston at the bottom of a clean sieve cylinder.

5. Debugging

Insert the adjustment rod into the sieve cylinder

Screw in the adjustment lever clockwise, feel a slight resistance, and then reverse counterclockwise for two turns.

Connect to the signal generator and turn the knob to the HOLD position.

Turn the knob to the poloase position

Measure the depth with a vernier caliper and record the data

Measure the depth data again with a vernier caliper. The value obtained by subtracting the second data from the first data is equal to 2.5mm.

Note: Adjust the adjustment rod repeatedly and measure it repeatedly. Make the gap reach 2.5mm.

6. Assembly

6.1 

Put the screen sieve outside the sieve cylinder

Install the screen sieve pad

6.2 

Install the first O-ring

 

Install the second O-ring

6.3 

Tighten the connecting sleeve with an extension rod and friction pliers

6.4 

Put the rubber O-ring on the thread protector

 

Apply silicone grease on the O-ring

 

Tighten the external thread protective cap and connect it to the sleeve

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