Product Details

Pressure-Bearing Lost Circulation Material

1. Product Overview

Pressure-Bearing Lost Circulation Material is a broad-spectrum lost circulation material developed for formations with different permeability. It significantly improves the anti-permeability performance in brine and seawater-based drilling fluids, forming a low-permeability dense sealing film on the wellbore. This effectively seals the pores and fractures on the rock surface, preventing drilling fluid and filtrate from deep formation invasion. It is widely used in onshore drilling, offshore drilling, vertical/directional/horizontal wells, with excellent performance in maintaining wellbore stability, improving formation bearing capacity, eliminating differential pressure stuck pipe, preventing fluid loss, and protecting reservoirs.

2. Composition & Key Features

Composition: Composite additives, cellulose, anti-sloughing agents and other multi-component synergistic formulations.

2.1 Core Performance Advantages

Good compatibility with drilling fluids, no adverse impact on rheological properties; High pressure resistance, significantly improving formation and fracture bearing capacity; Broad adaptability, suitable for multiple formations with different permeability; Excellent reservoir protection, reducing differential pressure stuck pipe and improving core permeability recovery.

3. Technical Specifications

4. Usage Instructions & Recommendations

4.1 Recommended Dosage

Recommended dosage: 1.5%–2% by mass concentration (or adjusted according to design requirements).

4.2 Application Method

Mix the product evenly with drilling fluid and inject into the system.

4.3 Dosage Adjustment

Adjust the dosage according to formation properties (porosity, permeability, fracture development). Increase the dosage or use in combination with other lost circulation materials for severe lost circulation zones.

5. Packaging, Transportation & Storage

Packaging: 25kg/bag in composite paper bags or customized packaging as per customer requirements.
Storage: Store in a cool, dry, well-ventilated place, protected from moisture, rain, high temperature and direct sunlight.
Transportation: Avoid violent collision, rain and direct sunlight during transportation to prevent package damage.

6. Safety Precautions

Wear protective gloves and dust masks during operation to avoid dust inhalation and skin contact. In case of accidental contact with skin or eyes, rinse immediately with plenty of clean water and seek medical attention if necessary.

7. Disclaimer & Technical Support

All specifications and descriptions in this document are for reference only. The product shall be used in accordance with the customer’s actual working conditions and technical requirements. Customized formulations and solutions are available upon request.

Application Cases of Pressure-Bearing Lost Circulation Material for Drilling Fluids

1.  High-pressure Bearing Plugging Case for Offshore Gas Storage Wells in Bohai Oilfield

Case Background: Offshore gas storage wells are featured with strict formation bearing capacity requirements, developed micro-fractures and weak cementation intervals. Conventional plugging materials have low compression resistance, poor pressure-bearing stability, and are easy to re-leak after pressure testing, failing to meet the high-standard pressure bearing and wellbore sealing requirements for gas storage well completion.

Application Formula & Dosage: On the basis of seawater-based drilling fluid system, 1.5%–2.0% pressure-bearing lost circulation material was added independently, matched with graded fine particle plugging components to build a high-strength pressure-resistant sealing system.

Application Effect: The product forms a dense high-strength sealing film on fracture and pore throats, which significantly improves formation pressure-bearing capacity. The formation pressure bearing value is stably increased to 3.0MPa–5.0MPa with no re-leakage after repeated pressure tests. It effectively solves the problem of insufficient pressure bearing of fractured formations, meets the sealing standard of offshore gas storage wells, and ensures smooth completion and cementing operations.

2. Lost Circulation Control Case for High-temperature Deep Wells in Shizigou Block, Qinghai Oilfield

Case Background: The deep formation of Shizigou block in Qinghai Oilfield has a high ground temperature of 140–160℃, low fracture pressure, developed fault fractures, and severe non-return lost circulation during drilling. Conventional plugging agents are prone to high-temperature failure and low plugging strength, resulting in repeated leakage and prolonged drilling cycle.

Application Method & Dosage: The product was added at 1.8%–2.2% to the high-density brine drilling fluid system, adopted centralized plugging and circulating curing process to ensure full filling and sealing of fracture channels.

Application Effect: The product retains stable high-temperature pressure resistance and excellent film-forming sealing performance under 160℃ high-temperature working conditions. The one-time plugging success rate is 100%, no repeated leakage occurs during subsequent drilling and tripping. The wellbore stability is significantly improved, and the single-well comprehensive drilling cycle is shortened by more than 25%.

3.  Pressure-bearing Stabilization Case for Severe Fractured Lost Circulation in Missan Oilfield, Iraq

Case Background: The formations of Missan Oilfield in Iraq are dominated by fractured carbonate rocks, with large fracture openings and severe dynamic leakage during drilling. The differential pressure between wellbore and formation is high, conventional plugging materials cannot withstand long-term downhole pressure, and leakage easily recurs after resuming drilling, resulting in high drilling fluid loss and high construction cost.

Application Dosage: 1.5%–2.0% pressure-bearing lost circulation material was added to the on-site water-based drilling fluid system, which was used alone for pressure-bearing plugging construction.

Application Effect: The product forms a tough and pressure-resistant integrated sealing layer inside fractures, which can effectively resist long-term downhole differential pressure erosion. It completely eliminates dynamic leakage and repeated leakage problems. The drilling fluid consumption is reduced by 50%, the downhole complex handling time is greatly shortened, and the drilling efficiency of difficult leakage wells in overseas blocks is significantly improved.

4.  Leakage Prevention & Pressure Improvement Case for Low-pressure Permeable Formations in Ordos Basin

Case Background: The low-pressure and low-permeability formations in Ordos Basin are featured with loose rock structure, developed pore permeability, frequent slight leakage and percolation during drilling. The formation bearing capacity is low, which cannot meet the requirements of subsequent density adjustment and well pressure testing, restricting safe and efficient drilling and cementing operations.

Application Effect: The product has excellent adaptive plugging performance for porous and fractured low-pressure formations. It forms a low-permeability dense sealing film on the wellbore surface, which effectively blocks pore-throat percolation channels, reduces drilling fluid filtration and micro-leakage, and significantly improves formation comprehensive bearing capacity. The whole drilling fluid system has stable rheology, good wellbore stability, and effectively avoids differential pressure stuck pipe and formation damage.

5.  General Wellbore Stabilization and Leakage Prevention Application for Multi-type Wells

Case Background: Conventional vertical wells, directional wells and horizontal wells often face common problems such as permeability leakage, micro-fracture leakage and insufficient formation bearing capacity during drilling. Single plugging materials have single function, which cannot balance plugging, pressure bearing and wellbore stabilization, resulting in poor comprehensive drilling effect.

Application Method & Effect: The product is applied at a conventional dosage of 1.5%–2.0%, suitable for fresh water, salt water and seawater drilling fluid systems. It can simultaneously realize efficient plugging, formation pressure improvement and wellbore stabilization, without affecting drilling fluid rheological properties. It features wide adaptability, simple on-site operation and stable performance, and can effectively reduce downhole complex risks and improve overall drilling benefits.