DST(Drill Stem Testing) Tools 5"Repetitious Circulating Valve
Product model: Repetitious Circulating Valve
Size:3 7/8", 5",7"
Type: Petroleum Drilling Tool & Accessory
Operate: annulus pressure operated
Standard: API
Service:H2S, CO2
Usage: drill stem tests
Working condition: High pressure high temperature(HPHT)
Working pressure: 10000psi ~ 15000psi
Condition: New
Briefly Introduction
The Repetitious circulating valve is an annulus pressure operated, recloseable circulating valve. Throughout the operation, the tool is repeatedly cycled up to a predetermined annulus pressure and then released.
The Repetitious valve consists of a nitrogen section, an oil system, a circulating valve, and a ball valve. The nitrogen section contains the nitrogen gas that counterbalances the hydrostatic and annulus pressures. The amount of nitrogen in the tool depends on well hydrostatic (mud weight and depth) and downhole temperature. This information must be known to properly prepare the tool for running in.
Note: With certain completion fluids, the mud weight at the surface can be significantly different from the actual mud weight downhole.
The operating and control mechanisms are contained in a closed oil system activated by annulus pressure acting on the nitrogen chamber, allowing an unlimited number of pressure cycles.
The circulating valve and the ball valve work together to keep circulating pressure off the formation. The ball valve will close before the circulating valve opens. The ball valve closes off the workstring.
Features and Benefits
• Permits well testing, pressure testing, and fluid circulation
• Allows unlimited number of pressure cycles
Operation
The well can be flow tested when the valve is in the well test position. When in this position, the circulating ports are closed and the ball valve is opened. During a downhole closure drillstem test, the Repetitious valve is in the well test position during flow and shut-in periods. The workstring can be pressure-tested in the blank position because the ball valve closes before the circulating valve opens. Fluid can be pumped in either direction through the tool in the circulating position. In this position, the circulating ports are open and the ball valve is closed.
Note: Before the tool is run, the hydrostatic pressure at the specified tool depth must be known. This information is required to obtain the proper nitrogen charging pressure.
Specifications:
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: 
Meets NACE-0175 requirements (>175°F) Maximum Differential Operating Pressure:
• From bottom of ball when opening—1,000 PSI (69 bar)
• From top of the ball when opening—5,000 PSI (345 bar)
• For operating the circulating ports—6,000 PSI OD to ID (annulus to tubing) (413 bar)
—0 PSI ID to OD (tubing to annulus)
*Service temperature up to 450°F (dressed with 600 series o-rings and PEEK backup seals)
**The values of tensile, burst, and collapse strength are calculated with new tool conditions,
Lame's formulas with Von-Mise's Distortion Energy Theory for burst and collapse strength, and
stress area calculations for tensile strength.
***Pressure rating is defined as the differential pressure at the tool. (Differential pressure is the
difference in pressure between the casing annulus and the tool ID.)
Xi'an KINGWELL OILFIELD MACHINERY Co., Ltd. (KINGWELL), is a highly reputable supplier for oilfield equipment and services to Oil & Gas industries and provide 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.
Accordingly most innovative and reliable toolsKingwell set up a long-term science and technology cooperation, with xi'an petroleum University, daqing/ changqing oil&gas institute and jianghan machinery Research institute.
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 Middle East.
The followings are some pictures about our Workshops & Equipments
Product delivery
- Payment : TT/LC
- Delivery : 30 days
- Origin : China
- Minimum Order : 1 set
- Packaging :wood case or steel carton
-Delivery Date:within 1-2 month(s) after receiving prepayment
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