Downhole equipment

Technical Specifications – Our Downhole Equipment Range

As a leading downhole equipment manufacturer, we produce a comprehensive range of tools in various sizes, connection types, and material grades. Below are some of our core products’ specifications:

Hydraulic Drilling Jars

Parameter	SJY121	SJY165	SJY203
Outer Diameter (mm/in)	121 (4 3/4")	165 (6 1/2")	203 (8")
Inner Diameter (mm/in)	44.5 (1 3/4")	57 (2 1/4")	70 (2 3/4")
API Connection	NC38	NC50	6 5/8 REG
Max. Tensile Load (KN)	350	700	1000
Max. Upward Jarring Force (KN)	350	700	1000
Max. Downward Jarring Force (KN)	180	350	500
Full Open Length (mm)	8950	9260	9786

Our SJY double-acting mechanical-hydraulic drilling jar integrates upward and downward jarring action with mechanical interlocking, suitable for all drilling operations and H₂S-resistant applications.

Mechanical Fishing Jars

Parameter	ZSJ80B	ZSJ70B	ZSJ56B
Outer Diameter (mm)	203	178	146
Inner Diameter (mm)	71.4	70	57
API Connection	6 5/8 REG	NC50	4 1/2 FH
Max. Tensile Load (KN)	2500	2300	2000
Max. Up Jarring Release Force (KN)	750	550	450
Max. Down Jarring Release Force (KN)	600	550	400
Weight (kg)	2124	1350	870

These drilling jars are connected with drill string as downhole stuck-freeing tools — the first choice for directional wells, complicated wells, and deep wells.

Releasing & Circulating Overshots (External Fishing Tools)

API Model	Outer Diameter (mm)	Max. Catch Size (mm)	Connection
LT-T89	89	60.3	NC26
LT-T102	102	73	NC26
LT-T114	114	89	NC31
LT-T127	127	95	NC38
LT-T152	152	128	NC38
LT-T168	168	127	NC50
LT-T194	194	159	NC50
LT-T206	206	178	NC50
LT-T219	219	178	NC50
LT-T232	232	203	NC50
LT-T273	273	241.3	6 5/8 REG
LT-T340	340	286	6 5/8 REG

Our Series 150 releasing and circulating overshot engages, packs off, and retrieves tubular fish — especially for drill collars and drill pipe. One overshot can be dressed with different grapple components to fish different sizes of fish.

Reverse Circulation Junk Baskets

Model	Barrel O.D. (mm)	Max. Fish O.D. (mm)	Thread Connection	Hole Size Range (mm)
LL-381	381	282	7 5/8 REG	406–444
LL-318	318	248	6 5/8 REG	349–406
LL-F286	286	217	6 5/8 REG	320–346
LL-F254	254	195	6 5/8 REG	275–295
LL-F200	200	154	NC50	223–241
LL-F178	178	130	NC50	198–209
LL-F130	130	94	NC31	155–165
LL-F121	121	90	NC31	142–152

*Designed and manufactured according to API Spec 7-1. The reverse circulation junk basket catches small junk objects such as cones, cutters, and hand tools from bottomhole. It produces local reverse circulation at the well core for complete junk recovery.*

Releasable Reversing Fishing Spears (Internal Fishing Tools)

Model	O.D. (mm)	Thread Connection (LH)	Catch Size Range (mm)
DLM-T48	95	NC26	39.7–41.9
DLM-T60	105	NC31	49.7–51.9
DLM-T73	105	NC31	61.5–78
DLM-T89	121	NC38	75–91
DLM-T102	121	NC38	88.2–102.8
DLM-T114	121	NC38	99.8–103
DLM-T127	127	NC38	107–116
DLM-T140	140	NC38	118–128
DLM-T178	178	NC50	153–166

These internal fishing tools are used for fishing drill pipe, tubing, and casing from fish holes. They can be used with internal cutters, bumper jars, and other accessory tools.

Note: All specifications can be customized based on your specific downhole conditions. Non-standard connections, special materials (including H₂S-resistant and low-temperature grades), and custom dimensions are available upon request.

Product Types – Complete Downhole Tool Portfolio

As a full-service downhole equipment manufacturer, we produce the following product categories:

1. Fishing Tools (External/Internal) – Releasing and circulating overshots, fishing spears, taper taps, junk baskets, mill‑over tools, and washover pipes. All built to API 7‑1 standards.

2. Jarring Tools – Mechanical drilling jars, hydraulic drilling jars, double‑acting mechanical‑hydraulic jars, jar intensifiers, and bumper jars. Designed to free stuck drill string components and minimize NPT.

3. Drill String Components – Drill collars, heavy weight drill pipe, crossovers, saver subs, kellys, and kelly saver subs.

4. Stabilizers – Integral blade stabilizers, non-magnetic stabilizers, roller reamers, sleeve stabilizers, and near‑bit stabilizers. Made from AISI 4145H Mod alloy steel or non-magnetic steel.

5. Cementing Accessories – Float collars, float shoes, stage collars (mechanical and hydraulic), centralizers, guide shoes, and cementing plugs.

6. BHA Components – Crossovers, subs (circulation, landing, orienting), non-magnetic drill collars, and downhole test tools.

Applications – Where Our Downhole Equipment Works

Our downhole tools have been deployed in:

• Offshore drilling operations – South China Sea platforms, Southeast Asia, Middle East Gulf. Our corrosion-resistant and API-certified tools withstand marine environments.

• Onshore conventional fields – Russia (Rosneft’s 11 low-temperature rigs), Kazakhstan, Middle East, North Africa, and China’s major oilfields.

• Shale oil & gas plays – Horizontal wells requiring high-torque tools and reliable fishing equipment.

• Workover and completion operations – For retrieving stuck tubing, packers, and downhole completion accessories.

• Deep and ultra-deep wells – Tools engineered for high-pressure, high-temperature conditions.

• Sour gas fields – H₂S‑resistant materials are available upon request.

Why Choose SJ Petro as Your Downhole Equipment Manufacturer?

• Sinopec‑backed engineering – As a direct Sinopec subsidiary, we combine state‑owned resources with proven manufacturing capabilities. Over 3,100 export shipments to 30+ countries.

• API, ISO & HSE certified – Our management systems hold API, ISO 9001:2015, and HSE certifications. API monogram available for qualified product categories.

• Over 2,100 precision equipment sets – A complete production facility including CNC machining, heat‑treatment, forging, casting, and assembly lines. Seven dedicated production lines for key components.

• 314 in‑house R&D engineers – We design our own tools — no copied or outsourced designs. Technical center authorized to set up a post‑doctoral research station.

• Complete quality control – Full traceability from raw material to finished product. Serial numbers die‑stamped on each workpiece. Every tool is individually tested.

• Short lead times – 45–60 days for standard fishing tools and jars. Emergency rush orders can be expedited.

• OEM/ODM welcome – Custom dimensions, special connections, non‑standard materials, and branded packaging. Just send us your specifications.

• Global export & after‑sales support – English‑speaking sales engineers. On‑site commissioning and training available. Spare parts stocked for major tool types.

• Competitive pricing from a direct manufacturer – No middleman markups. You deal directly with the factory.

Frequently Asked Questions (FAQ)

Q1: What API specifications do your downhole tools meet?
Our tools are manufactured according to API Spec 7, API 7‑1, API 5CT, and ISO 9001:2015 standards. Specific product categories can be API monogrammed. We can also provide third‑party certification (BV, DNV, SGS) upon request.

Q2: Do you offer H₂S‑resistant (sour service) downhole tools?
Yes. We produce H₂S‑resistant jars, fishing tools, and stabilizers using high‑quality imported sulfur‑resistant materials. Our H₂S tools are qualified for sour gas fields per NACE MR0175/ISO 15156.

Q3: What is your lead time for a standard drilling jar or overshot?
Standard lead time for most fishing tools and jars is 45–60 days from order confirmation. For large‑volume orders, lead times may be shorter due to our stocked raw materials.

Q4: Do you supply non‑magnetic drill collars and stabilizers?
Yes. We manufacture non‑magnetic drill collars and non‑magnetic stabilizers for directional drilling and MWD/LWD applications. We use premium non‑magnetic steel with full material certifications.

Q5: Can you customize tools for non‑standard API connections?
Absolutely. If your BHA requires a proprietary or non‑standard connection, we can machine custom threads and connections to your drawing or sample. Custom subs, crossovers, and adapters are also available.

Q6: Do you provide third‑party inspection?
Yes. We welcome inspection from BV, DNV, SGS, or any third party you nominate. We can provide full material test reports (MTRs), dimensional inspection reports, and performance test certificates.

Q7: What is the warranty on your downhole tools?
Standard warranty is 12 months from shipment or 6 months from first use (whichever comes first). We also offer extended warranty options for high‑usage tools.

Q8: Do you ship to my country?
We have exported downhole equipment to over 30 countries including Russia, Kazakhstan, India, Indonesia, UAE, Saudi Arabia, Canada, USA, UK, and Norway. We understand international shipping, customs clearance (HS code 843143), and LC documentation.

Q9: How can I request a quote?
Send the following details to export@sjpetro.com: tool type(s) required, preferred size and connection, quantity, material requirements (standard, H₂S‑resistant, non‑magnetic, low‑temperature), and any special dimensional requirements. We will respond within 48 hours with a detailed quotation and preliminary drawing.

Q10: Can I visit your factory?
Yes. We are located in Jingzhou, Hubei Province, China. Factory tours with our engineering team are available by appointment. We can also schedule a live video walkthrough of our manufacturing facility.