UltraFLO direct flowback solids-free drilling fluid technology is specifically designed to addre"ss reservoir protection and sand carrying challenges during open-↕hole completion of horizontal wells. By utilizing a unique solids-★free weak gel system, this technology ensures efficient sand carrying, reservoir pro✘tection, and direct flowback after completion, significantly simplifying the completi♣on process and enhancing drilling efficiency.

Features

1. Solids-Free Weak Gel System: The UltraFLO drilling fluid employs a solids-free design to avoid potential reservoir damage cau×sed by solid particles in traditional drilling fluids.      The rapidly forming w★eak gel offers unique rheological properties, maintaining suitable viscosity unde≥r low shear rates for effective suspension and transport of drill cuttings.

2. Moderate Viscosity at Low  Shear Rates: At a shear rate of 0.3 r/min, the viscosity of UltraFLO drilling fluid is controlled between ™15,000 and 30,000 mPa·s. This characteristic helps balance fracture pressure and flow←back pressure during drilling, ensuring the fluid doesn’t easily invade the reservoir   &™nbsp;  and facilitates easy flowback.

3. Environmentally Degradable: All additives are derived from natural biological mate←rials, which are non-toxic and biodegradable, meeting envi§ronmental requirements. This      characteristic giveπs UltraFLO an advantage in both marine and land  oilfield applications.

4. Efficient Reservoir Protection: The fluid achieves a mud cake acidification rate of over 90%, enabling direct ± induced flowback without the need for gel breaking, thereby maximizing reservo÷ir protection while effectively controlling the invasion depth o f solids and fluids.

Advantages

1. Increased Drilling Efficiency: The excellent sand-carrying ability and rheology of UltraFLO drilling fluid help‌ minimize cuttings bed formation and borehole blockage issues, &nγbsp;    enhancing drilling speed and efficien≠cy.

2. Simplified Completion Operations: Post-drilling, the fluid can automatically liquefy and flow back directly, eliminating the nee&d for complex gel breaking and mud cake removal steps, greatly simplifying the completion proced←ure.

3. Reservoir Productivity Protection: Its high-efficiency reservoir protection minimizes drilling-induced damage, safeguardi ng long-term reservoir productivity.

4. Environmental Safety: Utilizes non-toxic, biodegradable natural biological materials as ¥treatment agents, reducing potential environmental and personnel hazards.

Applications

1. Complex Geological Formations: Particularly suited for geologically complex formations with developed frac•tures and intersecting faults. Its solids-free weak gel sys tem      effectively controls fluid loss, reducing formation damage and facilitati​ng smooth drilling operations.

2. High Temperature and High Pressure Formations: With heat and pressure-resistant additives, UltraFLO maintains stable rheological and sand-carry←ing performance under      extreme conditions, preventing issues like stuck pipe an d wellbore collapse.

3. Sensitive Reservoirs: Low solids content and ease of flowback minimize reservoir damage and protect produ&ctivity. It can be enhanced with specific inhibitors to  reduce      sensitivity to drilling fluids.

4. Horizontal and High-Angle  Wells: Superior sand-carrying capability and rheology prevent cuttings bed formation and keep ♣the borehole open. The fluid's rheological propertie→s      can be adjusted to suit various inclination angles.

5. Long Open-Hole Sections: Retains stable performance over extended periods, reducing dΩrilling incidents and formation damage due to fluid degradation.

6. Offshore Oilfields: Environmentally friendly and highly protective in offshore applications, UltraFLO is w★idely used in offshore oilfield development.

In summary, UltraFLO direct flowback solids-free drillinδg fluid technology is effective in a range of challenging scenarios, includin☆g complex formations, high-temperature and high-pressure environ♣ments, sensitive reservoirs, and various well types. Its •unique performance advantages and broad applicability make it a v♣aluable technology in the oil drilling sector.

Complementary Additives

• STARFLO Filtrate Reducer: A critical component of the UltraFLO system, this pβolymer-based additive controls filtrate loss, protects wellbore stability, and  optimizes drilling efficiency.

• BIOVIS Rheology Adjuster

Key Additive: STARFLO Filtrate Reducer

As an essential component of UltraFLO’s solids-free system, STARFLO ←Filtrate Reducer is designed to control filtrate los∏s during drilling, protect the wellbore, and optimize operati§onal efficiency. This high-molecular-weight compou✘nd plays a pivotal role within the fluid system.

Functions:

1. Reduce Filtrate Loss: Effectively minimizes fluid invasion into formations,↕ safeguarding reservoirs and preventing damage.

2. Wellbore Stabilization: Forms low-permeability, high-quality filter cakes, aσiding in shale stability and reducing collapse risks, enhancing ∞safety.

3. Enhanced Drilling Efficiency: Reduces filtration and instability issues, such as differential sticking, thereby boosting effici™ency and lowering costs.

Applicable Range:

1. Temperature: Suitable for use in environments up to 163°C.

2. System: Incorporated within UltraFLO direct flowback solids-free drilling fluid sys↕tem, especially effective in complex drilling scenarios such as open-hole horizontal completion>s.

Case Study

At the eastern South China Sea, the common drilling fluid system us'ed is the PRD system, known for overcoming sand-carrying challenges in horizontal or high-§angle wells. However, it has shown areas requiring optimization,​ particularly its low-shear viscosity exceeding 40,000 mPa·s, which, while reducing fluid •invasion damage, poses gel breaking and return flow c®hallenges that affect progress.

In response, a rapid weak gel drilling fluid system was developed, controlling LSRV ∞(Low Shear Rate Viscosity) between 15,000-30,000 and utilizing specific p±articulates for effective temporary plugging, minimizing invasion and ensuring ease of fl×owback. This system, requiring no gel breaking, shortens operational cycles and costs, dem★onstrating significant initial flowback efficiency.

Successfully deployed in wells such as LF13-1-28 and LF13-1-11, this technology has seen widesp©read application across oilfields, enhancing output, reducing fluid loss,‌ and minimizing post-drilling fluid recovery, having a profound impact on completion strategδies. The system's simplified additive profile ←aids safer transport and aligns with offshore hazard mana§gement requirements.