Bow spring Casing centralizers
Bow spring centralizers, both welded and non-welded is to help center the casing in the wellbore, allowing even distribution of the cement around the casing during cementing operations according to API10D standard size from 4-1/2" to 20".
Feature :
A) Designed for high restoring force and low starting& running force.
B) End collars are designed with self-locking action,which are easy to assemble.
C) Undergo special coating process to prevent from rust.
D) Can be shipped in half assemble condition for economy in shipping and storage costs.
E) Specification:4-1/2" to 20". any special size or combination available on request.
Technical parameters:
| No | Specification | Bow type | ID(mm) | Length(mm) | Max OD (mm) | Bow spring |
| 1 | 5-1/2"*8-1/2" | I .Ⅱ | 142-148 | 600±50 | 225±5 | 5 |
| 2 | 7"*8-1/2 | I .Ⅱ | 181-186 | 600±50 | 235±5 | 6 |
| 3 | 9-5/8"*12-1/4" | I .Ⅱ | 250-255 | 600±50 | 330±5 | 8 |
| 4 | 10-3/4"*12-1/4" | I .Ⅱ | 274-276 | 600±50 | 330±5 | 9 |
| 5 | 13-3/8"*17-1/2" | I .Ⅱ | 342-347 | 600±50 | 450±5 | 11 |
| 6 | 20"*26" | I .Ⅱ | 510±1 | 600±50 | 660±5 | 12 |
Note :Ⅰ(single bow),Ⅱ(double)
Cementing plugs:
Cementing plugs from high performance material such as rubbers and phenolic resins.our cementing plugs are specially designed with a positive wiping action to ensure that the casing is clean, we have both conventional standard plugs and non-rotating plugs.
Top plugs
The top cementing plug is designed to exert continuous pressure on the casing wall. The core is made of aluminum or phenolic depending on the application and well conditions, the tapered base fits the cavity of the bottom plug initiating a positive seal. A solid rubber top plug is also available.
Bottom plugs:
Like the top cementing plug,the fins and tail section provide positive wiping action. Fins also serve as a seal while cementing. The core of bottom plug is alao made of special material such as aluminium or phenolic resins depend on the application and well conditions, a rubber diaphragm at the top bottom plugs ruptures after the plug is seated allowing cement to flow through
TECHNICAL PARAMENTERS
| Type | Sizes | Working temperature | Working pressure | Burst pressure | hardness |
| Top plug&bottom plug | 4-1/2",5-1/2",6-5/8",7",8-5/8",9-5/8" standard/ non rotating | -30℃ to 150℃ | ≥15MP | 1MP-2MP | 75-95 |
| 13-3/8",20"standard/ non rotating | -30℃ to 150℃ | ≥10MP | 1MP-2MP | 75-95 |
Float collar and float shoe
Float equipment serves the backbone of casing equipment used during primary cementing operations, float equipment guides the casing to total depth and prevents contaminated mud from entering the casing. Also,it provides a landing point for casing wiper plugs, reinforces the lower end of the casing string, and ensures greater accuracy of cement slurry displacement.
FEATURES:
API 5CT,API 5B,API RP 10F rating,china petroleum department standarc SY/T5618-2000.
Rounded nose profile helps guide the casing string(only for float shoe).
The valve is made with phenolic material and molded with high strength concrete. Both the calve and concrete are easily drillable with PDC or rock bits.
High strength design ensure excellent performance for flow endurance and back pressure holding.
Automatically non-rotational groove design ensures corresponding cementing plugs drilled out quickly(only for non-rotating float collar).
Single valve and double valve versions are available. Spring structure and bal structure valve are available: insret type and normal type are available.
Material and size:
API CASING GRADE: J55,K55,N80,P110,L80,etc.
SIZE VARY FROM 4"TO 20"
AVAILABLE CONNECTIONS:
API5RD CONNECTIONS:LTC,STC,BTC
Solid rigid casing centralizers
Rigid centralizers are an integral part of the cementing process. They provide the mechanism that centers the casing in the hole and allows uniform cement flow around the casing to help protect it at all point. Several styles of centralizers are available for matching different well specification and hole size,including turbulence generating designs that help clean the annulus and distribute the cement more evenly and uniformly. All models offer ample clearance for fluid passage and are extra effective in centering the casing, even in highly deviated hole and improve cement flow by reducing the effects of channeling.
Technical parameters
| Model | Style | Max OD(mm) | ID(mm) | Length(mm) |
| GF4-1/2x6 | Ⅰ.Ⅱ.Ⅲ | 145 | 116.5 | 200 |
| GF5x6 | Ⅰ.Ⅱ.Ⅲ | 145 | 129 | 200 |
| GF5-1/2x8-1/2 | Ⅰ.Ⅱ.Ⅲ | 205-210 | 142 | 200/300 |
| GF6-5/8x8-1/2 | Ⅰ.Ⅱ.Ⅲ | 205-210 | 171 | 200/300 |
| GF7-8-1/2 | Ⅰ.Ⅱ.Ⅲ | 205-210 | 181 | 200/300 |
| GF7-9-1/2 | Ⅰ.Ⅱ.Ⅲ | 225-235 | 181 | 200/300 |
| GF7-9-5/8 | Ⅰ.Ⅱ.Ⅲ | 225-235 | 181 | 200/300 |
| GF9-5/8x12-1/4 | Ⅰ.Ⅱ.Ⅲ | 300-305 | 248 | 200 |
| GF13-3/8-17-1/2 | Ⅰ.Ⅱ.Ⅲ | 430-435 | 346 | 200 |
Note: GF series rigid casing centralizer, classified as straight strip type (typeⅠ),spiral(type Ⅱ),roller type(type Ⅲ).
Stop collar
Stop collar is used to hold centralizers or cement baskets on any position casing, which ensures the position of centralizers or cement basket to meet the design, the stop collars are available in two types hinges type,slip on type, the stop collars can be installed on casing to limit the axial movement of centralizers and cement baskets.
Usage
1. Fastening screw stop ring when use, first set into the casing ,and then using a wrench to tighten the screws.
2. Fixed screw type when use ,first set into the casing,and then insert screws,Type in with a hammer.
3. Snap fit stop ring, direct stop ring button on the casing,use pin lock, then knocked into the screw.
Hinged bolted stop collars
An economical collar suitable for sub-critical annular tolerances,available in the size range 4-1/2" to 20",it has a cross bolt design which makes it an efficient and user friendly device.
Hinged spiral nail stop collars
Available in the size rang 4-1/2"-20",this device can be in both upset and non-upset casing to provide maximum clearance during rotation. It has a grove in the middle into which a spiral nail can be driven for improved grip on the casing, the broader firmly grips the collar into position around the casing.
Hinged stop collars with set screw
Available in the size rang 4-1/2" to 20", this device has a high cost-utility ratio. This hinged collar with a row of set screw position easily and firmly around the casing.
Slip on stop collars with set screw
This slip-on set screw device is recommended for small hole operations,available in size rang 2-7/8" to 20"and is gripped by a row of screw, this is a heavy duty device.
1. Centralizers: These tools are used to centralize the casing within the wellbore, ensuring even distribution of cement around the casing. They come in various designs, such as bow spring centralizers and rigid centralizers.
2. Float collars and float shoes: These tools are installed at the bottom of the casing string and contain a check valve that allows cement to flow down but prevents it from flowing back up. They help in maintaining the integrity of the cement column and prevent contamination of the cement during the cementing process.
3. Cementing plugs: These are used to separate different fluids during the cementing process. They are typically made of rubber or composite materials and are inserted at specific intervals in the casing string. They help in displacing drilling mud or spacer fluids with cement and ensure a proper cement bond.
4. Cement baskets: These tools are used to prevent the cement slurry from channeling or bypassing in the annular space between the casing and the wellbore. They are typically placed above and below the zone to be cemented and act as a barrier, forcing the cement to flow through the perforations or the desired zones.
5. Squeeze tools: These tools are used in squeeze cementing operations to repair or seal off zones that are leaking or not properly cemented. They allow for the injection of cement into specific areas of the wellbore to improve well integrity.
These are just a few examples of cementing tools used in the oil and gas industry. The selection of tools depends on the specific well requirements and the objectives of the cementing operation.