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Website: http://www.rlpacker.com Tester valve is used with safety sealing and open hole packer, which is suitable for open hole well testing. The tester valve is controlled by drilling string’s vertical motion, the main parts: main by-pass, secondary by-pass and metering valve. It can make mud go through the by-pass hole on packer’s upper part when descent down hole and encounter tight hole section during ascent. While applying drilling string weight, it can close quickly to release drilling string’s pressure, and the by-pass valve will open after being applied 88.9 KN (20000Psi) pulling power(bigger than free point) for 1-2 minutes delay, also can open by super addition pulling power instead of time delay. Open tester valve after testing can balance the pressure on upper and lower part of packer. It can provide safety insurance for the closing and opening of tester valve if open the time delay function of by-pass valve. Hydraulic oil can flow through the interspace between valve mandrel and valve during descent down period, with the result that the main by-pass hole will be closed while going through tight hole section if must by using crown drill, so we need equip a secondary by-pass under any condition in order to let mud through when descent down hole.

Website: http://www.rlpacker.com The safety joint is a kind of RH safety joint that used in DST, it connect to the upper end of packer to keep the tool left in hole is the list while need decoupling the safety joint if jam releasing failed, but the tools and drill string on the upper side of safety joint still can obtain formation data. Then release jam by adopting other methods, and thread safety joint after releasing jam to tripping out the lower drilling string. The safety joint also can be used in various fishing work, drilling and workover operation.1. Structure character and working principle

Website: http://www.rlpacker.com Pressure recorder sub is composed of an upper joint, a cylinder body, a manometer joint and a lower joint. The pressure gauge is installed on the pressure gauge joint. When measuring the internal pressure, the two oil inlet holes on the upper joint need to be blocked with drain plug, and the drain plug on the pressure gauge joint can be removed. When measuring the external pressure, it is only necessary to remove the drain plug on the upper joint and plug the two oil inlet holes on the manometer joint with the drain plug.

Website: http://www.rlpacker.com RTTS safety joint is mainly composed of upper joint, J groove sleeve, mandrel, valve body, lower joint and other parts. To release the safety joint, a pull is first applied to the string to break the pull sleeve. This does not, however, release the safety joint; it is necessary to move the string up and down and maintain torque to release the safety joint. The RTTS multi-function safety connector can be screwed on the RTTS circulating valve or used between the RTTS circulating valve and the RTTS packer. When the safety connector is screwed on the upper end of the RTTS circulating valve, it can be screwed directly into the upper end of the circulating valve.

Website: http://www.rlpacker.com The round mandrel slip joint is designed and manufactured according to NACE MR0175, and suitable for working in H2S abouve 175oC and full H2S working condition.The round mandrel slip joint likes other slip joints, accepts the movement associated with ocean heave or temperature change without allowing the movement to disturb the placement of downhole tools. The slip joint can also accommodate any changes in string length caused by temperature and pressure during a downhole test. The round mandrel slip joint is composed of two distinct parts: an outer housing and a moving inner mandrel.

Website: http://www.rlpacker.com The rupture disk (RD) safety circulating valve is the component of the DST toolstring, with the functions of both a safety valve and circulating valve. The RD safety circulating valve workes as a safety valve when the annulus pressure reaches a predetermined value. At that pressure, the valve isolates the workstring below the tool and establishes communication between the annulus and the workstring above the tool. The Rupture Disk Circulating Valve can be converted into a circulating valve when the ball valve section is removed and attach a lower adapter called RD Circulating Valve. The valve can not be open when closed in downhole operation. RD Circulating valve is the same as RD Safety circulating valve except short of ball valve section, the annulus pressure made RD burst and the pressure goes into RD hole and push circulating mandrel forward, then open the circulating ports.

Website: http://www.rlpacker.com The casing wall scraper is used to remove mud or cement sheath, rust, mill scale, paraffin, and similar substances from the casing inner diameter (ID). This is especially important in precompletion stages where tight tolerance equipment will be run. The casing wall scraper's standard operating mode is in the nonrotating position. The 360° coverage blades and stabilizers remain stationary while the drillpipe can be rotated for long periods during circulation to clean the wellbore. The casing wall scraper is designed with ample circulation area to allow for high-rate circulation and bypass of debris.

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