DST Tools 3"Tubing String Testing (TST) Valve
Size: 3 7/8", 5"
Type: Tubing String Testing Valve
Service: H2S, CO2
Working condition: High pressure high temperature(HPHT)
Working pressure: 10000psi ~ 15000psi
Condition: New
Application: Oil well testing
Briefly Introduction
The tubing string testing (TST) valve is a full-opening valve used to pressure-test the workstring while running in the hole. The valve is operated after it is stung into a permanent packer or after a retrievable packer is set. The TST valve requires a differential pressure between the annulus and the tubing to shear. The TST valve can also be used for pipe flexing if it is run below an annulus pressure-responsive circulating valve.
The TST valve consists of:
• flapper valve and spring
• shear pin section
• locking dogs
Features and Benefits
• Flapper valve requires only 4 psi to open.
• Testing string can be pressure-tested as many times as required as it is run in the hole.
• Valve shear rating can be pre-determined at 500 psi increments.
• Valve can also be used for pipe flexing.
Operation
When the TST flapper valve opens, it allows the workstring to fill up. The shear pins hold the mandrel in place. The workstring can be pressure-tested as many times as required as it is run in the hole. While the workstring is stationary, a spring keeps the flapper valve closed. After the workstring pressure test is complete, the tool is sheared when annulus pressure is applied to the predetermined shear pin rating. (The shear rating can be adjusted in 500 psi increments to shear from 500 to 6,000 psi differential.) When the pins shear, the mandrel moves up and pushes the flapper open,allowing the locking dogs to engage. The tool is then fully open. The tool works on differential pressure between annulus and tubing. Failure to shear initially on application of annulus pressure is not critical. The process of drawing the well down also creates a pressure differential that helps the tool shear. When used for pipe flexing, the TST valve is run below an annulus pressure-responsive circulating valve, such as the RD circulating valve. The string is pressured up against the flapper valve as many times as required. The circulating valve is sheared after flexing operations are complete, and the workstring is pulled out dry.
Specifications:
1.Halliburton type, all could change with Halliburton parts.
2.All equipments are produced according to API standard.
Below are spec for you reference: 
Company Introduction
Xi'an Kingwell Oilfield Machinery Co.,Ltd is a professional supplier for oilfield products according to the API standard.
Our products have exported to USA, Canada, Egypt, India and UEA, etc with 40 FCL containers per month. Now, with high quality and short supply and good service, our products have got good reputation home and abroad .
Here we got some prise as follows.
Certifications
Kingwell is a CNPC & SINOPEC & BV certified company, having all the Quality Systems in place for design, planning, manufacturing and quality monitoring & traceability to ensure our products match the highest quality standards.
We test our products strictly according to the NACE MR 0175-2002 Standard and our quality assurance period is 12 months.
Certificates endorsed by DNV/BV/ABS and Documents we can supply with the shipments:
1. Pressure Test Certificate with Graph and time recorded.
2. Function Test
3. Rubber Products NACE Compliance
4. Material Mill Certificate and treatment characteristics
5. H2S Compliance
6. Service Manual
7. Parts Manual
8. Testing Procedures.
9. Open up type tool drawing for dressing purpose– if any.
Manufacturing Facility
Equipped with latest machining facilities like CNC 3-axis Turning centers, CNC 4-axis milling centre, high temperature heat treatment furnaces, Centre lathe machines, Deep Hole Drilling, Boring & Honing machines, our company could meet long term production target and be governed efficiently by well-qualified and experienced Board of Directors and Engineers.
Training and Field Supports
We have a team of well qualified and experienced field support personnel for Training. According to customer's requirements, we provide operation training service for our customers who purchase our products.
Generally speaking, our customer training mainly includes followings:
1) To know the basic knowledge of the products, such as the usage, the working environments, the working principles, the structure, ect.
2) To learn the operation and use of products.
3) To master the basic requirement of designs of tool strings and of testing operation.
Related products
We also provide accessories and other related products, which you can find in this website.
The following is the pictures about products accessories and some other related products
Product delivery
Payment:TT/LC:30% advance payment.70%before shipment
Warranty: Warranty period is 1 year after installation.
Origin: China- Minimum
Order: 1 set
Packaging: wood case or steel carton
Delivery Date: within 1-2 month(s) after receiving prepayment
Logo: KW, we can produce according to customer requirements.
Technical Documents: We can provide technical documents according to your requirements.
The followings are some pictures about product packaging
Service
We believe in Customer delight, achieved by the supply of Quality Products & Services and Continual Improvement in our Manufacturing Processes for timely delivery at competitive prices. We work in a professional, competitive, and cost-effective manner consistent with the Customer requirement.
Kindly let me know if you have any interest or enquiry about our products. You are also always welcomed to come to our factory for a visit at your convenient time.
We will offer you a good price and show you our best service.
