Lost circulation prevention technology
Overview：
Through appropriate drilling fluid density selection, fine ECD control and "heavy mud pumping" process measures, combined with four sets of technologies, including plugging while drilling, one-way pressure plugging, wall pressure enhancement and wall enhanced leakage prevention, the risk of leakage can be greatly reduced, the formation pressure bearing capacity can be effectively improved, and the problem of on-site leakage prevention can be solved.
Leak stoppage while drilling technology
The representative product of plugging while drilling technology is PF-SZDL, which is composed of rigid materials and fiber materials, and has good filling and plugging effect. On the premise of ensuring normal drilling, it can effectively solve the formation leakage and small fracture leakage, and effectively improve the formation pressure bearing capacity.
Applicability：
Applicable to permeable formation; Applicable to water-based drilling fluid; Temperature: ≤150 ℃
Characteristics：
Little influence on drilling fluid rheology; Effectively improve the formation pressure bearing capacity; Add while drilling with circulation, no tool limitation
One way pressure plugging technology
概述：
The representative product of unidirectional pressure plugging technology is PF-SEAL, which is mainly composed of plant fiber. It is suitable for permeable and microfissure leakage formation and can play a role of shielding temporary plugging.
Applicability：
Applicable to permeable formation; Applicable to water-based drilling fluid; Temperature: ≤150 ℃
Characteristics：
It does not block oil and gas channels, which is conducive to reservoir protection; Good compatibility with common drilling fluid treatment agents; It has little effect on mud performance; Stabilize the borehole wall.
Wellbore pressure enhancement technology
概述：
The representative product of sidewall pressure enhancement technology is PF-STRH/PF-MOSTRH, which can reduce the risk of differential sticking and leakage through plugging, reduce friction and improve the lubrication of drilling fluid.
Applicability:
It is applicable to permeability, micro fracture development, narrow safety density window and weak formation; Applicable to water-based and non water-based drilling fluids respectively; Temperature: ≤200 ℃
Characteristics:
Effectively seal the leakage formation; Obviously improve the bearing capacity of the formation; Good compatibility.
Wall enhancement loss-proof technology
概述：
PF-RG is the representative product.Wall enhancement loss-proof technology has special high elastic properties. When the downhole pressure increases, the product is compressed and deformed into the formation fracture. When the pressure is released, the material will return to its original shape, so as to enhance the stability of wellbore and plug the formation fracture.
Applicability：
High Permeability and micro fractures formation、narrow drilling margin wells and weak formation；Water, non-aqueous drilling fluid；Temperature: ≤260 ℃
Characteristics：
Excellent compatibility with drilling fluids；Improved formation pressure-bearing capacity；Highly resilient.
