NRCS  Non- rotating casing scraper
 
 

Size	Body OD	Kits One set	Stab Kits
4-1/2	92	One set  with availability of blades to scrap	Spiral or straightening centralizer.
5	94
5-1/2	110
6-5/8	136
7	136
9-5/8	203
10-3/4	228
13-3/8	286
20	286

 
             
 
 
 
KWCS Model Non- rotating casing scraper
 
 
1. Overview
KWCS casing scraper is an internal tool used for removing the obstructions or foreign material from inside the walls of casing, such as residual cement, clay lump, and the burr, scales coming from casing rolling, the perforating charge which is set on the wall during sand preventing perforating inside, as well as rust, scale, hard paraffin on the production casings.
 
2. Structure of Scraper Part
KWCS Scraper is made up of mandrel, centering sleeve, upper support seat, hoop scraper, semi-annular plate, lower support seat, fixing sleeve, lower scraper, wearing ring, adjusting ring, spline body, gland nut, lower joint as well as other components. The hoop scraper and lower scraper can be stretched out and drew back to removing the dirt layer-by-layer according to the thickness of obstructions on the inner wall of casing; Meantime, the scraper and mandrel can mutually rotate. Mandrel and spline body are connected by spline pair connection, it can achieve the torque transmission, transfer the upper torque to the lower tools.
 
 
 3.Technical Data:
 

Model	Max. OD (inch)	Max. OD. of Blade (inch)	Casing Weight	ID (inch)	Overall Length (inch)	Connection(API) UP X DOWN	Suitable casing (inch)
KWCS103	4 1/16	4 5/8	15-18#	1 3/16	60	2 7/8REG×2 7/8REG	5
KWCS148	5 13/16	6 5/8	23-32#	1 9/16	82	NC38×NC38	7
KWCS210	8 1/4	9 1/16	40-47#	2 13/16	93	NC50×NC50	9 5/8
KWCS346	11 1/4	127/8	71.43#-107.15#	2 13/16	100	65/8REG×65/8REG	13 5/8

 
 

 
COMBO Type Casing Scraper
 
COMBO type casing scraper and GGQM/QC are used in conjunction, the annular scraper and the lower scraper can be internal and external expansion automatically according to the thickness of the casing wall dirt, to scrape dirt layer-by-layer. At the same time between scraper and spindle to turn to each other. The mandrel and the outer tube by using spline connection, can realize the torque transmission.
 

type	Maximum outside diameter of body    mm(in)	Max diameter of scraper mm(in)	Hydrophthalmia mm(in)	Total Length mm(in)	connection thread
COMBO5	105(4.13)	127(5)	25(1)	2000(78.7)	NC31
COMBO6.5	138(5.43)	158(6.22)	40(1.61)	2798(110)	NC38
COMBO7	148(5.82)	170(6.69)	40(1.61)	2798(110)	NC38
COMBO9.5	210(8.26)	229(9)	70(2.76)	2821(111)	NC50

 
 
 
 
 
            KWXZ Model Casing Scraper
 
KWXZ casing scraper is one of auxiliary tools in well completion, testing and downhole working, It is mainly used for cleaning cement, sand, residual bullets, rag, and otherobjects on casing inner surface, in order to keep casing inner surface cleaning and the drilling tools working normally. KW XZ casing scraper can't be used in drilling operation. 
      It is one kind of new type casing scraper, not only as general fixed casing scraper, but also used as a rotating type structure casing scraper. If as a fixed casing scraper, as long as increase adjustable pad locates in upper sub to make it non-rotate, otherwise decrease adjustable pad. It will be used as a rotating casing scraper.
Technical Data:

Sharp-Razor™ Series  Non Rotating Casing Scraper  DIMENSIONAL DATA
Nominal OD(in)	Weight (ppf)	Connection	Centralizer OD(mm)	Scraper Cage OD (mm)	ID(in)	Length (in)
4-1/2”	11.6-15.1 PPF	2-3/8 REG B*P	96  3.78’’）	4.05’’	20	65
5”	11-24.1 PPF	2-3/8 REG B*P	9.94’’	4.56’’	20	65
5-1/2”	14-43.1 PPF	2-3/8 REG B*P	4.33’’	5.03’’	1	69
6-5/8”	20-32ppf	3-1/2 REG B*P	5.31’’	5.86	1	70
7”	26-35 lb/ft	3-1/2 REG B*P	5.83’’	6.3’’	1.18’’	74
9-5/8”	43-53.5 lb/ft	NC50 B*P	8.07’’	8.77’’	2.81’’	86
10-3/4”	32.75--85.3	6-5/8 REG B*P	9.17’’	9.76’’	2.81’’	98
13-3/8”	48-54.5-61-68-72	6-5/8 REG B*P	12.32’’	12.83’’	2.81’’	110

 
 
 
 
 
 
 
 
 
 
 
 
Cleaning Casing Scraper
 
 
 
The Casing scraper is used to clean the cement, mud, embedded bullets, rust, mill scale, paraffin, perforation burrs and other substances from the inside walls of casing. Maintaining a clean casing ID is important to the operation of all tools used in drilling the well. Adhesive materials on casing walls will frequently cause these tools to become difficult to operation.

Sharp-Razor™ Series  Non Rotating Casing Scraper  DIMENSIONAL DATA
Nominal OD(in)	Weight (ppf)	Connection	Centralizer OD(mm)	Scraper Cage OD (mm)	ID(in)	Length (in)
4-1/2”	11.6-15.1 PPF	2-3/8 REG B*P	96  3.78’’）	4.05’’	20	65
5”	11-24.1 PPF	2-3/8 REG B*P	9.94’’	4.56’’	20	65
5-1/2”	14-43.1 PPF	2-3/8 REG B*P	4.33’’	5.03’’	1	69
6-5/8”	20-32ppf	3-1/2 REG B*P	5.31’’	5.86	1	70
7”	26-35 lb/ft	3-1/2 REG B*P	5.83’’	6.3’’	1.18’’	74
9-5/8”	43-53.5 lb/ft	NC50 B*P	8.07’’	8.77’’	2.81’’	86
10-3/4”	32.75--85.3	6-5/8 REG B*P	9.17’’	9.76’’	2.81’’	98
13-3/8”	48-54.5-61-68-72	6-5/8 REG B*P	12.32’’	12.83’’	2.81’’	110

 
Technical Data:
 
 
  HC Hydraulic Scraper      
 
The new HC is composed of centralizers, device and sleeve combination switch in series, with a drill pipe connection at both ends of the thread. It workshop in conjunction with the drilling, grinding, milling, through wells and other working tools, so that a downhole tool to complete a variety of different jobs, reduce the number of the drill string from the next, greatly improve operational efficiency and reduce mining casts. After drilling, milling, grinding, through wells job is completed by pitching from wellhead pressure, the scraper blade play. Hydraulic scraper device can work the same as a conventional scraper device. And loop holes connected to scrape beneath the sleeve wall switch is also open at this time can carried out reverse circulation flushing.
HC – Hydraulic scraper
The new hydraulic scraper has the following characteristics: in drilling, milling, grinding and other operations, scraper device of the blade is limited in the body’s groove, in the role of the upper centralizer, stretched out less scraper not to scratch on the inner wall of the casing, thus will not affect to normal operation of other tools.
 

specification	Gauge outside diameter (mm)	Gauge in casing flow area (mm2)	drift diameter (mm)	Gauge length (mm)	Total Length (mm)
5＂	Φ102	990	Φ25	500	650
5 1/2＂	Φ115	1110	Φ30	500	650
7＂	Φ148	2155	Φ50	750	900
7 5/8＂	Φ160	2060	Φ50	750	900
7 7/8＂	Φ170	2185	Φ50	750	900
10 3/4＂	Φ232	3855	Φ70	750	1050

 
 
 
1. This tool can be used alone, also can be combined with drilling, completion and other tools to become a new more functional tool.
2. In the multi joint operation, this tool should be used in conjunction with the sliding sleeve switch and the stabilizer, so as to ensure its normal operation.
 
Technical Parameters:

technical parameters
Applicable casing specifications	5＂ ~ 10 3/4
Connect thread	2 3/8＂IF•BXP、2 7/8＂IF•BXP 3 1/2＂IF•BXP、4 1/2＂IF•BXP

 
 
Sliding Sleeve Switch
A sliding sleeve switch is a tool that provide differential pressure for the hydraulic packer and other tools that need to be operated by hydraulic pressure in the process of repairing well, well completion and other operations. It works by pitching the ball to the tube.

technical parameters
Applicable casing specifications	5＂ ~ 10 3/4
Connect thread	2 3/8＂IF•BXP、2 7/8＂IF•BXP、 3 1/2＂IF•BXP、4 1/2＂IF•BXP

 
 
 
 
 
 
 Other Types of Kingwell Casing Scraper 
 
 

Sharp-Razor™ Series  Non Rotating Casing Scraper  DIMENSIONAL DATA
Nominal OD(in)	Weight (ppf)	Connection	Centralizer OD(mm)	Scraper Cage OD (mm)	ID(in)	Length (in)
4-1/2”	11.6-15.1 PPF	2-3/8 REG B*P	96  3.78’’）	4.05’’	20	65
5”	11-24.1 PPF	2-3/8 REG B*P	9.94’’	4.56’’	20	65
5-1/2”	14-43.1 PPF	2-3/8 REG B*P	4.33’’	5.03’’	1	69
6-5/8”	20-32ppf	3-1/2 REG B*P	5.31’’	5.86	1	70
7”	26-35 lb/ft	3-1/2 REG B*P	5.83’’	6.3’’	1.18’’	74
9-5/8”	43-53.5 lb/ft	NC50 B*P	8.07’’	8.77’’	2.81’’	86
10-3/4”	32.75--85.3	6-5/8 REG B*P	9.17’’	9.76’’	2.81’’	98
13-3/8”	48-54.5-61-68-72	6-5/8 REG B*P	12.32’’	12.83’’	2.81’’	110

 
5 , 7 , 95/8  .
 

 
HCS type heavy casing scraper
 
Introduction
HCS type heavy casing scraper is an effective tool for scraping the inner wall of the casing. The tool is simple in structure and flexible in operation.
 
Before and after the perforation of new wells, the cement, iron, artillery shells, burr, paraffin, oil and other debris inside casing need to be removed to protect the formation from being polluted. At the same time, to ensure completion tools successfully trip in and achieve sitting requirements of packer and other seal tools. In addition, the well after long-term use, casing inside wall can cause damages, such as reducing, rupture, burrs and other issues. Need to down the through well device to check whether inner diameter is changing, also need to be down the scraper to remove the metal burrs, scale and other material on the inside of casing.
 
Basic Structure
HCStype heavy casing scraper device mainly consists of: upper joint, the righting sleeve, a centralizer body and scraper frame inner sleeve, scraper frame, right-handed scraper, disc spring seat, disc spring, left-handed scraper, positioning spacer ring, lower joints, seals and other components.
 
 
Working Principle
HCS type heavy casing scraper is mainly between the joints and the lower joints fitted with the righting sleeve, a centralizer body and scraper frame inner sleeve, scraper frame, right-handed scraper, disc spring seat, disc spring, left-handed scraper and positioning spacer ring. Right-handed scraper and left-handed scraper is located above the disc spring seat and disc spring. When the GGQX type heavy casing scraper into casing, the blade is pressed to disc spring, disc spring stick to casing wall, pull the tools up and down to scrape the inner of casing.
 

Sharp-Razor™ Series  Non Rotating Casing Scraper  DIMENSIONAL DATA
Nominal OD(in)	Weight (ppf)	Connection	Centralizer OD(mm)	Scraper Cage OD (mm)	ID(in)	Length (in)
4-1/2”	11.6-15.1 PPF	2-3/8 REG B*P	96  3.78’’）	4.05’’	20	65
5”	11-24.1 PPF	2-3/8 REG B*P	9.94’’	4.56’’	20	65
5-1/2”	14-43.1 PPF	2-3/8 REG B*P	4.33’’	5.03’’	1	69
6-5/8”	20-32ppf	3-1/2 REG B*P	5.31’’	5.86	1	70
7”	26-35 lb/ft	3-1/2 REG B*P	5.83’’	6.3’’	1.18’’	74
9-5/8”	43-53.5 lb/ft	NC50 B*P	8.07’’	8.77’’	2.81’’	86
10-3/4”	32.75--85.3	6-5/8 REG B*P	9.17’’	9.76’’	2.81’’	98
13-3/8”	48-54.5-61-68-72	6-5/8 REG B*P	12.32’’	12.83’’	2.81’’	110

 

Number	Total length (mm)	nozzle (mm)	Casing PPF	Centralizer OD mm	Blade OD max. (mm)	Body OD (mm)	Connection (API)	Max. Tensile (t)	Max. torque (KN.M)
HCSX50	1738	25.4	11.5-15	103	118	103	2 3/8REG	65	25
HCSX54	1738	38	14-17	103	118	103	NC31	80	30
HCSX70	1800	47	17-29	148	168	148	NC38	120	40
HCSX95	1800	70	36-58.4	210	230	210	NC50	150	50

Parameter
 
 casing scraper is a durable

  

. 

Wellbore clean up is a critical component of any new well construction. Failure to adequately clean the wellbore can cause major difficulties in running the completion resulting in large amounts of NPT with all the associated costs. Conversely, performing over-complicated clean ups to ensure success adds additional risks and unnecessary extra cost.

 

This paper examines an operator's experience with wellbore  clean ups over a wide range of assets in the UK and Norwegian sectors of the North Sea. The operator wished to reduce the time taken by developing best practice guidelines. This would provide a common approach to wellbore clean up operations over all assets.

 

Using reports from 19 offshore wells completed between 2002 and 2004, the time taken during clean up operations was split between nine categories:

 

Running Tools

Chemical Clean up / Displacement

Pit Cleaning

Waiting on Equipment

Waiting on Weather

Pressure Testing

Non clean up Ops

Safety Events

Waiting on Permits

This allowed the causes of extended time to be identified and pinpointed the areas where most time could potentially be saved. Some of these were:

 

Clean up tool failures

Over-complicated tool-strings

Becoming stuck due to over ambitious toolstrings

Rig equipment failures

Incomplete tools being sent offshore

Repeating of chemical clean up due to wellbore filters being full of mud/debris

Delays while waiting for pit cleaning to be completed

Lessons not being learned from other assets

These and other causes were further examined and discussed by operator staff in a workshop and vendor interviews. Guidelines were then developed by combining existing good practices from different assets and other industry experience.

 

Background

 

Talisman Energy is one of the largest oil and gas operators in the UK sector of the North Sea. At the time of this study, Talisman operates a wide ranging portfolio of assets in  the UK and Norway comprising of platforms, FPSOs and many Subsea developments. Talisman has acquired all of these assets from other operators, normally retaining the staff and, to an extent, the working practices of the previous operator. As a result, there can be differing ‘best practice' approaches between personnel working on different assets. For this reason as well as reviewing benchmarking data, a study was initiated with the aim of developing in-house wellbore clean up best practices to allow a common, efficient approach across all assets and operations.

 

Benefits of Guidelines

 

Will provide uniform approach across all assets.

Lessons learned across assets are captured to ensure continuous improvement.

Aid development of less experienced Engineers.

Will reduce overall time of clean ups through consistent best practice use.
 

Reduced time = Reduced costs