LPR-N Tester Valve DST(Drill stem testing)

Model: KW-DST-LPR-N Valve-002
Place of Origin: Shaanxi,China (Mainland)
Power: Hydraulic
Standard or Nonstandard: Standard
Pressure: High Pressure
Structure: Safety
Material: Alloy
Temperature of Media: High Temperature
Media: Oil
Brand Name: KINGWELL -5" LPR-N Valve-02
Size: Size 3 7/8", 5"
Working pressure: Pressure 10000psi ~ 15000psi
Service:: H2S, CO2
Working condition: High pressure high temperature(HPHT)
Type:: LPR-N Valve
Certification:: API, ISO
Operate: Opening,annulus pressure-operated
Application:: Drill stem testing
Package: Wood case or steel carton Condition
Condition:: New


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Product Description

Payment & Shipping Terms Supply Capacity
Unit Price:1.0 USDProduction Capacity:100 sets per month
Trade Term:FOB,CFR,CIF,DDP,DAP,CIP,CPT,FCA,EXW,DDUPacking:wood case or steel...
Payment Terms:L/C, D/P, D/A, T/TDelivery Date:within 1-2 month(s)...
Min. Order:1 Set/Sets
Means of Transport:EXPRESS, Ocean, Air, Land

DST Tools 5" LPR-N Valve

Size:3",3 7/8", 5" , 7"

Service:H2S, CO2

Working pressure: 10000psi ~ 15000psi

Working condition:High pressure high temperature (HPHT)

Type:LPR-N Valve

Usage:Drill stem testing

Package:Wood case or steel carton

Condition: New

Standard: API, ISO, NACE, MRO175-2002

Briefly Introduce  

The LPR-N tester valve is a full opening,annulus pressure-operated valve. It measures multiple closed-in

pressures in cased holes where pipe manipulation is restricted and a full-opening string is required. The

nitrogen chamber is charged at the surface to a selected pressure determined by surface temperature,

bottomhole temperature, and bottomhole pressure. If the intended test requires a permanent packer that

uses a stinger mandrel or seal nipple, a variety of Halliburton bypass tools are available, depending on field

application, to help ensure that the formations and downhole equipment are protected from excessive pressure buildup.


The LPR-N tester valve is composed of a ball valve section, a power section,and a metering section. The ball valve section provides multiple downhole closures. It is turned by operating arms. The power section has a floating piston that is exposed to the hydrostatic pressure on one side and pressurized nitrogen on the other side. With the packer set, pump pressure applied to the annulus moves the piston downward, activates the operating arms, and opens the ball valve. When the annulus pressure is released, pressurized nitrogen returns the piston upward, closing the ball. After the surface equipment is properly installed, the packer is set, and the rams are closed, pressure is applied to the annulus, using rig pumps to operate the LPR-N tester.

Features and Benefits:
• The ball valve operates independently of internal pressure changes, such as with acidizing or fracturing operations.

• Advanced materials and processes provide a unique metal-to-metal seat for exceptional gas-holding capabilities.

• The Pressure Poerated tester valve (LPR-N valve) has been through an extensive five-day qualification testing at 400°F and15,000 psi burst and collapse pressures.

• An open-in feature allows the operator to run the Pressure Poerated tester in the hole with the ball valve opened or closed.

• Fluids can be spotted or circulated through the PRESSURE POERATED tester (LPR-N valve)with the packer unseated.

A double nitrogen chamber can be added to the Pressure Poerated tester for use in deep, hot, high-pressure wells to reduce the operating pressure.

A double nitrogen chamber can be added to the LPR-N tester for use in deep, hot, high-pressure wells to

reduce the operating pressure.

To begin testing, quickly apply pump pressure to the annulus to a predetermined pressure, and hold for 10 minutes to pressurize the nitrogen chamber. After pressure has been metered through the metering cartridge, pressure in the nitrogen chamber will be slightly less than combined hydrostatic and pump pressure in the annulus. This helps ensure that the ball valve stays open during testing or treating operations.

The closing force may be increased on wells with an extremely high flow rate and wells producing a large amount of sand. Before the tool is closed, the annulus pressure isincreased to a predetermined safe pressure below the operating pressure of the circulating valve and held for 10 minutes. This procedure creates additional closing force when the annulus pressure is released.

Releasing the annulus pressure as quickly as possible closes the ball valve. A minimum of 10 minutes is needed to allow excess closing pressure in the nitrogen chamber to equalize before annulus pressure is reapplied. It is best to use the highest safe operating pressure to obtain maximum closing force.

1. Halliburton type, all could change with Halliburton parts.
2. All equipments are produced according to API standard NACE MRO175-2002

Below are specfor you reference:   
DST Tools 5LPR-N Valve

There is draft of LPR-N Valve for your reference
DST Tools 5LPR-N Valve











Total Length



Working pressure

15000 PSI(105MPa)


Ball unseal differential pressure

5000 PSI(35MPa)


Differential pressure of Ballvalve top and bottom

10000 PSI (70MPa)


Internal yield Pressure Strength

20300 PSI(140MPa)


Outer yield Pressure Strength



Tensile Strength (yield)

438000 LB(1947KN)


Torsional yield Strength

540261 LB*IN.(61 KN*M)


Service surroundings

above 175℉ defend sulfur


Service Temperature



Connection Thread

3 1/2 IF.BXP



7IN\7 1/2IN


Xi'an KINGWELL OILFIELD MACHINERY Co., Ltd. (KINGWELL) is a highly reputable supplier for oilfield equipment and services to Oil & Gas industries and provides complete solutions.

With over 10 years developing, we were developed from the beginning drilling service to manufacture factory who produce OCTG, DST tools and Solid control products.

KINGWELL have experienced team, stronger enough to meet any challenge, we do believe honest is the base of business and cooperation; our aim is to build solid relationship with any part of honest. kingwell can provide highly efficient services to its clients resulting in accurate and timely deliveries at the best prices. Our products have been exported to Europe, American and MiddleEast.


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.

Design & Development

Kingwell has an ongoing relationship with Xi'an Petroleum University and built up long term cooperation with China Aerospace Group for more than 10 years. Design Department is familiar with CAD and Pro-E facilities and has on rolls qualified & experienced engineers. Now, they are engaged in development of new products as required in the market place. Kingwell' products are validated in-house in a Test Well, a Sub-surface Type Test Facility with simulated well conditions up to 15000 psi Differential pressure , 400°F and Max 450°F

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.

Related product

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
DST Tools 5LPR-N Valve

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.

Additional service: Customers are served to test our products in our factory upon request.

The followings are some pictures about product packaging
DST Tools 3 7/8Rupture Disk Sampler


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
Any enquiry of above products or relative parts, PLS feel free contact back, and we will offer you a good price and show you our best service..

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