APPLICATION ADVANTAGES连续循环钻井技术应用特点及优势

What continuous circulation changes downhole 连续循环，为井下带来四重改变

Extended-Reach Drilling大位移钻井 Managed Pressure Drilling控压钻井 Underbalanced Drilling欠平衡钻井 Air Drilling空气钻井 Deepwater & Ultra-Deepwater深水 / 超深水钻井 Loss- & Kick-Prone, Pressure-Sensitive Wells易喷易漏 · 地层压力敏感井

01CLEAN清洁

Continuous cuttings transport — a cleaner hole连续返屑带砂，井眼更清洁

Prevents cuttings-bed build-up, reducing drag, stuck pipe and related complications防止和减少岩屑床形成，减少阻卡等复杂情况
No pump-off cuttings settlement and re-grinding — solids control works better避免开停泵造成岩屑反复沉降挤磨，提高固控效果
Lower friction and torque — less load on top drive and pump systems, safer operations降低摩阻与扭矩，减轻顶驱和泵系统负荷，提升作业安全性
Fewer and shorter wiper trips — more productive rig hours减少短起下钻次数与段长，提高作业效率

Torque fluctuation 2.86 vs 7.40 kN·m · zero wiper trips扭矩波动 2.86 对比 7.40 kN·m · 零通井 PY10-5-A1H — liner ran straight to bottom, eliminating a 41 h trip; Bohai wells cut cuttings 3.8% → 0.4%.PY10-5-A1H 井 — 尾管直接下到底、省去一趟 41 小时通井；渤海井岩屑浓度由 3.8% 降至 0.4%。

02STABLE稳压

Eliminates pressure surges — stable wellbore pressure有效消除压力激动，井眼系统压力稳定

Steady wellbore pressure prevents collapse and keeps the hole smooth and in gauge保持井内压力稳定，防止井壁坍塌，保持井眼光滑
Effective ECD control prevents surge-induced losses and influx, and eases mud conditioning有效控制 ECD 值，防止压力激动引起的井漏与溢流，利于泥浆性能调整
A steady bottomhole pressure allows a lower ECD — faster drilling, better reservoir protection井底压力平稳，可适当降低 ECD 值，提高钻速、保护储层

ECD fluctuation < 5% — vs 17.6–21% conventionalECD 波动 < 5% — 常规接立柱为 17.6–21% EP21-4-A1H held ECD steady through three fault zones; PY10-5-A1H kept ECD within 2.3% across a fault that collapsed the window to 1.20–1.32 g/cm³ — no losses, no influx.EP21-4-A1H 井穿越三条断层 ECD 平稳；PY10-5-A1H 井在密度窗口骤缩至 1.20–1.32 g/cm³ 的断层段 ECD 波动控制在 2.3% 以内 — 无井漏、无溢流。

03SAVE增效

Higher drilling efficiency, lower well cost提高钻井时效，降低钻井成本

Fewer downhole incidents — more on-bottom drilling time降低井下复杂情况发生概率，提高钻井时效
No hole-cleaning circulation needed before each connection — total connection time across the well drops sharply省去接立柱前停泵循环返砂的等待，全井接立柱总时大幅缩短

Average ROP 19.30 vs 7.66 m/h — about 2.5×平均机械钻速 19.30 对比 7.66 m/h — 约 2.5 倍 PY10-5-A1H vs an offset well without continuous circulation — saving 39 rig-hours against plan; back-reaming trips up 71% faster on EP21-4-A1H.PY10-5-A1H 井对比未用连续循环的邻井 — 较计划节省 39 钻机小时；EP21-4-A1H 井倒划眼起钻提速 71%。

04SMOOTH平稳

Steady borehole conditions — better wellbore quality保障井筒压力平稳，井身质量更优

Less interference with directional and steering tools — tighter trajectory control减少对定向与导向仪器的干扰，提高井眼轨迹控制能力
Good wellbore quality eases casing running and cementing operations良好的井身质量，利于下套管与固井作业

9,508 m through three faults — no losses, no collapse, no stuck pipe9,508 m 穿越三条断层 — 无井漏、无坍塌、无卡钻 EP21-4-A1H, China's deepest offshore well — longest single run 1,744 m; on PY10-5-A1H the φ177.8 mm liner ran straight to bottom with normal cementing returns.EP21-4-A1H 井（中国海上第一深井）单趟最长进尺 1,744 m；PY10-5-A1H 井φ177.8 mm 尾管直接下到底、固井返出正常。

TECHNICAL HIGHLIGHTS技术亮点

Why FECCS — and only FECCS — for HPHT and ERD wells 高温高压与超大位移井的 FECCS 不二之选

Only Domestic Valve-Type CCS国内唯一阀式连续循环系统

The only domestically developed valve-type continuous circulation drilling system in China. One of the few providers globally to offer HPV + PLC + Manifold intelligent control for valve-type CCS systems.国内唯一自主研发的阀式连续循环钻井系统。全球少数几家掌握 HPV + PLC + Manifold 智能控制阀式连续循环系统的提供商之一。

Anti-Drop Valve Plate Design阀板防脱安全设计

Failure-safe valve plate design — if the plate detaches, it falls into the circulation sub interior rather than into the wellbore, eliminating downhole fishing risk.失效安全阀板设计 — 阀板若脱落，落入循环短节内部而非井筒，杜绝井下打捞风险。

Eliminates ECD Fluctuations消除 ECD 跳变

Continuous mud circulation through connection make-up keeps ECD steady — preventing differential sticking, lost circulation, and formation damage in narrow drilling windows.接立柱过程中持续循环维持 ECD 稳定 — 防止差压卡钻、漏失和窄密度窗口井段的储层伤害。

Proven ROP & Cost Benefits验证的提速与降本效益

Across field applications, FECCS has delivered an average 18% acceleration in drilling rate of penetration and around 12% reduction in per-well cost — directly improving project economics.在现场应用中，FECCS 平均提速约 18%，单井降本约 12% — 直接改善项目经济性。

THE SCIENCE BEHIND A STEADY ECD稳住 ECD 背后的科学

Theory and field data, validating each other 理论与现场数据，彼此印证

FECCS isn't only a piece of hardware — it rests on a complete, quantitative model of equivalent circulating density. The model is built on standard well-hydraulics theory, and it has been checked against real bottom-hole measurements. The two agree to within 1%. FECCS 不只是一台设备——它背后是一套完整、可量化的当量循环密度（ECD）模型。该模型建立在标准钻井水力学理论之上，并已用真实井底实测数据校核，二者吻合度优于 1%。

Built on API RP 13D power-law hydraulics基于 API RP 13D 幂律水力学模型

The governing equation控制方程

ECD=ESD+ P_annulusg · H

ESD — static mud density静态泥浆密度 P_annulus — annular friction pressure loss环空摩擦压耗 g·H — gravity × true vertical depth重力 × 垂直井深

Power-law rheology幂律流变

Flow-behaviour index and consistency are derived from Fann viscometer readings, exactly as specified in API RP 13D — capturing how the mud thins under shear in the annulus.流性指数与稠度系数由范氏粘度计读数按 API RP 13D 推导，精确刻画泥浆在环空剪切下的剪切稀化行为。

n_a = 0.5 · log(θ₃₀₀/θ₃)

Cuttings loading岩屑加载

Drilled cuttings raise the effective density of the annular fluid. Transport efficiency and a volumetric balance give the in-situ concentration and the true circulating density.钻屑提高环空流体的有效密度。由携岩效率与体积平衡求得井内岩屑浓度与真实循环密度。

ρ_eff = ρ(1−C_a) + ρ_c·C_a

Annular pressure loss环空压耗

Flow regime is determined from the critical velocity, then the laminar or turbulent annular friction loss is integrated section by section — collar and pipe — to the bit.由临界流速判定流态，再分段（钻铤、钻杆）积分层流或紊流环空摩擦压耗至钻头。

P_a = f(PV, YP, V, D_h−D_p, L)

THEORY ✕ FIELD — A WORKED WELL理论 ✕ 现场 — 一口实井

10.31ppg

Model ECD模型计算 ECD

≈

10.39ppg

Field mud-log ECD现场录井实测 ECD

A 12¼″ hole at 3,750 m, 60 L/s, oil-based mud. The model reproduces the measured circulating density almost exactly — the small offset is the lumped bottom-hole assembly, and it is conservative. 12¼″ 井眼、3,750 m、排量 60 L/s、油基泥浆。模型几乎精确复现实测循环密度——微小偏差源于钻具组合的合并简化，且偏保守。

0.8%

deviation between calculated and field-measured ECD — the model is trustworthy.计算值与现场实测 ECD 的偏差——模型可信。

WHY CONTINUOUS CIRCULATION — IN NUMBERS为什么要连续循环 — 用数字说话

The connection surge that breaks narrow-window wells 压垮窄窗口井的，正是接单根那一下激动

Conventional · pump stops every connection常规作业 · 每次接单根都停泵

Restart surge spikes the ECD开泵激动，ECD 瞬间跳高

ECD 10.3

5 min · 10.9

10 min · 11.1

Pore孔隙压力Drilling window钻井窗口Fracture破裂压力

After a 5–10 min connection, mud gel structure sets. Restarting the pump must break that gel — a pressure surge of ΔP = 4τ₀H/(D_h−D_p). At 5 min the bottom-hole ECD jumps +0.8 ppg (3.71 MPa); at 10 min +1.0 ppg (4.45 MPa) — enough to fracture the formation and lose returns in a tight window. 停泵接单根 5–10 分钟后，泥浆静胶凝结构形成。再开泵须先破胶，产生激动压力 ΔP = 4τ₀H/(D_h−D_p)。停泵 5 分钟井底 ECD 突增 +0.8 ppg（3.71 MPa），10 分钟 +1.0 ppg（4.45 MPa）——在窄窗口足以压裂地层、井漏失返。

FECCS · circulation never stopsFECCS · 循环永不停止

No gel, no surge — ECD stays flat不结胶、无激动 — ECD 始终平稳

ECD 10.3

ESD 10.1

Pore孔隙压力Drilling window钻井窗口Fracture破裂压力

By circulating continuously through every connection, FECCS never lets the gel set — so there is no break-gel surge at all. The bottom-hole ECD holds steady inside the window. This is the physics behind the field result: ECD fluctuation cut from ~17–21% to under 5%. FECCS 在每次接单根全程持续循环，泥浆从不结胶——因此根本不存在破胶激动。井底 ECD 稳稳保持在窗口内。这正是现场结果的物理本质：ECD 波动从约 17–21% 降到 5% 以下。

Run the numbers on your own well用您自己的井跑一遍

Enter geometry, mud rheology and flow rate — get ECD, flow regime, cuttings loading and the connection-surge risk, computed with the same validated model.输入井身结构、泥浆流变与排量，即得 ECD、流态、岩屑加载与接单根激动风险——由上述同一套验证过的模型计算。

Open the ECD Calculator打开 ECD 计算器

SYSTEM SPECIFICATIONS系统技术参数

Engineered for HPHT environments & long-duration runs 为高温高压环境与长时间连续作业而设计

FECCS Main Unit FECCS 主机参数

Dimensions外形尺寸1,700 × 1,300 × 2,300 mm

Power Supply电源380V · 3φ4W

Motor电机4 kW · Explosion-proof

Frequency Converter变频器Siemens 7.5 kW · 0–650 Hz

Input / Output Coupling输入/输出接口3″–1502 Hammer Union · 70 MPa

Side Circ. Coupling侧循环接口2″–1502 Hammer Union · 70 MPa

High-Pressure Hose高压软管2″–1502 · OD ⌀73 · 52 MPa

Hose Length Options软管长度选配1.5 / 3 / 3.5 / 5 / 7.5 / 10 / 25 m

Plug Valve Grease Pressure旋塞阀注脂压力8,500–10,000 psi

System Test系统试压52 MPa, ΔP ≤ 2 MPa / 15 min

7″ Continuous Circulation Sub 7″ 连续循环短节

Internal Pressure Rating抗内压75 MPa

Side Valve Tension侧阀孔抗拉≥ 500 T

Side Valve Torsion侧阀孔抗扭≥ 135 kN·m

Torsional Strength抗扭强度> 110,000 ft·lb

Tensile Strength抗拉强度> 1,102 klb

Temperature Range耐温范围−30 °C ~ 150 °C

Main Valve Min. Bore主阀最小通径⌀72 mm

Main Valve Max. Flow主阀最大流量4.2 m³/min

Side Valve Min. Bore侧阀最小通径⌀46 mm

Side Valve Max. Flow侧阀最大流量3 m³/min

Internal Blowout Prevention内防喷功能Yes — on abnormal well pressure井下异常压力时可实现

Connection Type扣型Customised to client requirement根据客户需求

Max. Continuous In-Hole Time最长连续入井时间240 hours

Circulation Sub — Sizing Matrix 连续循环短节 — 分尺寸规格表

The 7″ circulation sub is supplied matched to the drill-pipe size in service. Every unit is proof-tested to 1,102 klb tension and 100,000 ft·lb torque before dispatch. 7″ 连续循环短节按在用钻杆尺寸配套供货。每支出厂前均经 1,102 klb 拉伸与 100,000 ft·lb 扭转试验验证。

Cutaway of the FEODE FECCS circulating sub showing the internal blowout-prevention main valve and side circulation port / FECCS 循环短节纵剖结构图，含内防喷主阀与侧向循环通道

Sectional view of the circulation sub — full-bore main valve with internal blowout-prevention capability, and the side port that keeps mud flowing while the connection is broken. 连续循环短节纵剖图——全通径主阀具备内防喷能力，侧向循环通道在卸扣期间维持泥浆流动。

Item项目	For 5″ DP	For 5-1/2″ DP	For 5-7/8″ DP
Sub weight接头重量	115 kg	126 kg	124 kg
External size接头外部尺寸	7″ × 0.85 m	7″ × 0.85 m	7″ × 0.85 m
External thread tensile strength外螺纹抗拉强度	1,265 klb	1,184 klb	1,200 klb
Thread torsional resistance螺纹抗扭强度	81,102 ft·lb	77,200 ft·lb	94,300 ft·lb
Make-up torque上扣扭矩	43,800 ft·lb	42,000 ft·lb	56,600 ft·lb
Rated internal pressure额定内压强度	10,000 psi	10,000 psi	10,000 psi
Inner main valve min. bore内主阀最小通径	⌀72 mm	⌀72 mm	⌀72 mm
Max. tensile test接头最大拉伸试验	1,102 klb	1,102 klb	1,102 klb
Max. torsion test接头最大扭转试验	100,000 ft·lb	100,000 ft·lb	100,000 ft·lb

✳ Other sizes and connections can be customised to client requirement. ✳ 可根据客户要求定制其他尺寸与扣型。

COMPONENTS & ANCILLARY SYSTEMS系统组成与配套

Everything that goes to the rig floor with it 随系统一并交付的全套配套

FECCS is delivered as a complete package — main unit, circulation sub, sealing elements, connection manifold and the ancillary hardware needed to rig it up. Every pressure-containing component is rated to the same 10,000 psi working envelope. FECCS 以完整成套形式交付——主机、连续循环短节、密封件、连接管汇，以及现场安装所需的辅助装备。所有承压部件按同一 10,000 psi 工作压力等级配置。

FEODE FECCS connecting manifold system with high-pressure union valves and accumulator assemblies / FECCS 连接管汇系统，高压由壬阀组与蓄能器组件

FECCS connection manifold — high-pressure union valve stack and accumulator assemblies, skid-mounted. FECCS 连接管汇系统——橇装高压由壬阀组与蓄能器组件。

Rubber Sealing Elements橡胶密封件

Material: HNBR rubber材料：HNBR 橡胶
Tensile strength: 25 MPa (3,625 psi)抗拉强度：25 MPa（3,625 PSI）
Temperature resistance: −45 °C to 150 °C耐温范围：−45 ℃ ～ 150 ℃
Oil resistance: volume change under 5 % after 7 hours immersion in No. 3 standard diesel at 120 °C耐油性能：标准 3# 柴油 120 ℃ 高温煮泡 7 小时，体积变化率小于 5%

Connection Manifold System连接管汇系统

Rigid high-pressure lines: union pup joints, union crossovers, 90° union elbows, flanged unions, and J-type / U-type swivel elbows高压硬管线：高压由壬短节、由壬转换接头、90° 弯头、法兰由壬，以及 J 型与 U 型活动弯头
Connections: 2″–3″ 1502 unions with matching flanges — rated 10,000 psi接口规格：2″～3″-1502 由壬接头，配套法兰——额定工作压力 10,000 psi
Flexible high-pressure hose: 2″–1502 union, rated 7,500 psi高压软管：2″-1502 由壬接头，额定工作压力 7,500 psi
Hose lengths available: 1.5 / 3 / 3.5 / 5 / 7.5 / 10 / 25 m可提供长度规格：1.5 / 3 / 3.5 / 5 / 7.5 / 10 / 25 米

Ancillary Systems辅助系统

Extended Links加长吊环

350 t (350 T) capacity — 3.75 m long350 吨（350T）——3.75 米长
500 t (500 T) capacity — 3.75 m long500 吨（500T）——3.75 米长

Dedicated Mud Bucket专用泥浆防喷盒

Top bore sizes 5″, 5-1/2″ and 5-7/8″ — matched to the drill pipe in service顶孔尺寸 5″、5-1/2″、5-7/8″ 等，适配不同尺寸钻杆

PRODUCT GENERATIONS产品迭代历程

Five generations of in-house R&D 五代完全自主研发

2011

1st Generation第一代

2013

2nd Generation第二代

2016

3rd Generation第三代

2018

4th Generation第四代

2024

5th Generation第五代

SELECTED CASE STUDIES典型作业案例

Validated across the South China Sea & Bohai basins 南海与渤海全海域实战验证

FLAGSHIP · CHINA'S DEEPEST OFFSHORE WELL 旗舰案例 · 中国海上第一深井

EP21-4-A1H

9,508 m

Measured Depth · Dual National Record井深 · 双项全国纪录

Enping 21-X field, Hailong 9 platform — China's deepest offshore well, setting national records for both depth and horizontal reach (HD/TVD 4.43). 12-1/4″ section drilled 4,594–8,131m + 8-1/2″ section 8,131–9,508m. 164 XT57 circulation subs deployed; single-run distance 1,744m — record-setting. ECD held steady at 1.34–1.45 sg through three fault crossings; connection time reduced to 8–9 min. 恩平 21-X 油田，招商海龙九平台 — 中国海上第一深井，创井深与水平位移双项全国纪录（水垂比 4.43）。12-1/4″ 井段钻进 4,594–8,131m + 8-1/2″ 井段 8,131–9,508m。投运 XT57 循环短节 164 个；单趟钻进 1,744m — 创纪录。穿越三条断层段 ECD 稳定在 1.34–1.45 sg；接立柱时间提效至 8–9 分钟。

BOHAI FIRST DEPLOYMENT 渤海首次应用

JZ25-1-B7 / B22P1

88%

Cuttings Cleaning Efficiency岩屑净化效率

July–August 2021. First FECCS deployment in the Bohai Basin. 8-1/2″ hole section 3,906–5,001m (length 1,095m). Cuttings concentration reduced from 3.8% to 0.5%, delivering 88% cleaning efficiency and stable hole conditions through highly faulted sections. 2021年7-8月。渤海盆地首次部署 FECCS。8-1/2″ 井眼 3,906–5,001m（段长 1,095m）。岩屑浓度由 3.8% 降至 0.5%，净化效率达 88%，复杂断裂带井段井况保持稳定。

ERD APPLICATION · 2.5× ROP 大位移井应用 · 机械钻速2.5倍

PY10-5-A1H

19.30 m/h

Average ROP — vs 7.66 without CC平均机械钻速 — 未用连续循环仅 7.66

Panyu Oilfield's hardest ERD well (7,646 m MD, HD/TVD 2.76, full-section oil-based mud, a fault collapsing the window to 1.20–1.32 g/cm³). Continuous-circulation-valve drilling over the φ215.9 mm section held ECD within 2.3% and capped torque fluctuation at 2.86 kN·m — versus an offset well, ROP rose 2.5× and the φ177.8 mm liner ran straight to bottom, eliminating a 41-hour wiper trip. 番禺油田难度最高的大位移井（井深 7,646m、水垂比 2.76、全井段油基钻井液、断层使密度窗口收窄至 1.20–1.32 g/cm³）。连续循环阀钻井应用于 φ215.9mm 井段，ECD 波动控制在 2.3% 以内、扭矩波动仅 2.86 kN·m — 对比邻井机械钻速提升 2.5 倍，φ177.8mm 尾管直接下到底、省去一趟 41 小时通井。

Peer-reviewed. Documented in China Offshore Oil and Gas (2025) and the Journal of Southwest Petroleum University (2018). 同行评审佐证。相关应用发表于《中国海上油气》（2025）与《西南石油大学学报》（2018）。

Read the full case studies →查看完整案例 → Technical white paper →技术白皮书 →

System系统	FECCS continuous circulation, 5th gen
Control控制	One-key flow-path + PLC
Circulation sub rated pressure循环短节额定压力	10,000 psi
High-pressure hose rating高压软管额定压力	7,500 psi
Drill pipe sizes supported适配钻杆尺寸	5″ · 5-1/2″ · 5-7/8″
Temperature range耐温范围	−30 °C ~ 150 °C
ERD case measured depth大位移案例井深	9,508 m
ECD fluctuation reduced toECD 波动降至	under 5% (from ~17–21%)
Back-reaming improvement倒划眼提升	~71%