Technical features

• Cementing cement is used to realize fracturing interlayer isolation without additional perforation and open hole packer, which greatly reduces the construction cost and is safe and reliable;
• Tools enter the well at one time to realize integration of well completion and modification.The construction process is simple and the operation efficiency is high；
• The well completion fracturing pipe string has a simple structure. Fracturing stages are not limited；
• After fracturing operation, there is full drift diameter in the wellbore, which is favorable for later liquid flowback and subsequent tool running；
• It is beneficial to the later transformation and maintenance of the well. In case of water production in the production layer, the sliding sleeve can be closed by lowering the cementing sliding sleeve switch tool to achieve the purpose of plugging the bottom water.。

Technical principles

A sliding sleeve and a casing pipe column are run into a well in series, and after conventional well cementation is carried out, the cement used in the cementing process is relied upon to achieve the isolation between the fracturing layers. The switch tool is run in through the tubing or coiled tubing. The protruding lock block on the switch tool cooperates with the shoulder of the sliding sleeve. By pulling up the tubing string, the flow hole of the sliding sleeve is opened for the fracturing operation. After the first stage of fracturing is completed, the sliding sleeve is closed with the switch tool and the next stage sliding sleeve is opened until the operation is finished. The sliding sleeve is opened for production.

Infinite staged fracturing technology with switchable cementing sliding sleeve Tubular string

 

 

A core component of that pipe column string is as follows:Cementing sliding sleeve capable of being opened and closed, sliding sleeve opening and closing tool, float collar and guide shoe. And the match tool has stable performance and simple operation.

Cementing sliding sleeve capable of opening and closing

Product features

• Up-going opening mode is adopted to ensure that the sliding sleeve will not be opened in advance when the rubber plug goes down during cementing;
• The number of fracturing stages is not limited, and there is no need for drilling operation because of the full drift diameter in the string.；
• The inner surface of the sliding sleeve is coated with a special protective layer, so that the sliding sleeve is in quarantine with the cementing cement.；
• The sliding sleeve is provided with a positioning mechanism, so that the switching tool can accurately position the sliding sleeve。
• The sliding sleeve has a self-locking function in an opening or closing state, and the function is stable and reliable.。

Technical parameters

Model	Total length/mm	*Large outside diameter/mm	*Small diameter/mm	Operating temperature/℃	Operating differential pressure/MPa	On/off load /kN	Both ends are connected with buckle type/in
4 ½″	900	φ151	φ101.6	150	70	40	4 ½ ″  LTC
5 ½″	970	φ171.5	φ124.3	150	70	40	5 ½ ″  LTC

Outline structure drawing

Sliding sleeve switch tool

Product features

• The sliding sleeve switch tool is in the normally open state, the pressure is withdrawn, and the sliding sleeve can be selectively opened and closed;
• It has a special sand prevention function to prevent the possible sand jamming problems that may occur during operation.

Technical parameters

 

Model	Total length/mm	* Large outside diameter/mm	* Small diameter/mm	Operating temperature/℃	Withdraw pressure/MPa	Tensile load/kN	Suitable for sliding sleeve/in	Both ends are connected with buckle type/in
HTKG-60	530	φ60.3	φ20	150	4	>300	4 1/2 ″	2 3/8 ″ TBG
HTKG-90	780	φ90	φ30	150	5	>400	5 1/2 ″	2 7/8 ″ UP TBG

Outline structure drawing