CT Energy钻进提速杀手锏 SRD负向脉冲水力振荡器

The CT Energy’s SRD-Ratler is a downhole mechanical device that is used during drilling to reduce static friction and increase ROP. The axial vibration generated through a negative pressure pulse reduces drag and enables a more efficient transfer of weight onto bit.

The SRD-Ratler tool is located in the horizontal section of the drill string and induces a negative square pressure wave that excites the drill string reducing static friction and enabling a more efficient transfer of weight onto the bit. With the integration of a Shock-Sub this negative pulse generates an axial force at a low frequency continuously exciting the drill sting reducing drag.

HOW IT WORKS

As the pumping pressure acts to expand the shock sub, the localized compression at the tool (WOB transfer) acts to compress the tool. Once the stand pipe pressure is vented to the annulus, the shock sub spring energy and change in stand pipe pressure work together to contract the tool causing an axial force that effectively breaks static drill string friction.

1.Integrated shock tool assembly reacts to negative pressure pulse, transmitting it to mechanical axial oscillation and further reducing friction.
2.Negative pressure pulse, produces fluid hammer effect with less standpipe pressure. (Tunable for high and low flow environments).
3.Short stage PDM defines pressure pulse frequency.
High flow configurations available.
4.Connections available.
NC38, NC40, NC50 – inquire with sales for other connection availability.

KEY POINTS

• Increases sliding ROP
• Efficiently transfers WOB
• Compatible with any MWD/LWD vendor
• Reduces static friction
• Negative pressure pulse requires less standpipe pressure

Pulse Characterization

Tool generates a low frequency negative pressure pulse at 3.3hZ. The nature of the negative pressure pulse does not damage MWD equipment; Allowing tool placement to be much closer to the bit, effectively breaking friction on the lateral section of the drill string.

In the graph bellow you can see that with the negative pulse and low frequency we are able to achieve a larger differential pressure pulse with less stand pipe pressure increase.

Experience

Drilled over 800 runs in North America to date

Clients include: Talisman, Progress/Petronas, Encana, Pengrowth, Husky Energy, ect.

Features & Benefits

Negative pulse does not interfere with or damage MWD equipment, therefor placement in string can be optimized

Axial oscillations effectively transfers weight on bit improving ROP

Oscillation of drill string breaks static friction and reduces stick slip and increase sliding ROP

Sizes & Specs

5” SRD Ratler

Flow Rate Range:800 to 1400 LPM；
Pressure drop Target: 1375 to 2750 kPa；
Pulse Frequency: 3 to 4 Hz；
Total Length: 5.8 m；
Connections: 3 ½” IF or 4”FH (NC38 or NC40)；

6.75” SRD Ratler

Flow Rate Range: 1,500 to 2,000 LPM；
Pressure drop Target: 1375 to 2400 kPa；
Pulse Frequency: 3 to 5 Hz；
Total Length: 6.0 m；
Connections: 4 ½” IF (NC50).

Case Studies

SRD Ratler Friction Reduction

The SRD Ratler Friction Breaking Tool reduces axial drag in the horizontal section, improving weight transfer to the bit and reducing sliding time.

Two wells drilled on the same pad using the same design and equipment were compared

Well A used a SRD Ratler to break friction and improve slide drilling Well B did not use a friction breaking tool

Well Name ：Well A;
Friction Breaking Technology：SRD Ratler;
Drill pipe：4”;
BHA：Mud Motor;
Mud Type：Water Based 10.3 ppg;
Spud to TD：20 days.

Well Name ：Well B;
Friction Breaking Technology：No Tool;
Drill pipe：4”;
BHA：Water Based 10.3 ppg;
Mud Type：Water Based 10.3 ppg;
Spud to TD：26 days.

Results

The Slack off weights when slide drilling was compared with rotary drilling slack off weights to quantify the sliding drag.

The amount of 5” SRD Ratler Friction reduction ranged from 20,000 lbs to 40,000 lbs.

Toe Tapper allowed coiled tubing to reach beyond predicted lock-up depth and reach Target Depth

Toe Tapper provided effective WOB, 321 composite plugs were milled with an average of 5.3 min/plug

Fluid hammer effects provided 17% reduction is coefficient of friction

About CT Energy

As a privately owned and operated Canadian company, CT Energy provides innovative drilling solutions for the global oil & gas market. We pride ourselves on being a leading edge service provider that works together with clients to optimize their drilling programs.