18-07-2019 дата публикации
Номер: US20190218443A1
Friction forces pose a danger to wellbore formation integrity, equipment stress, and success of the drilling operation. Friction forces in the wellbore can be managed by adding lubricants into drilling fluids. Lubricants reduce torque and drag friction forces on the drillstring, and improve the rate of penetration (ROP) during operation of the wellbore. Polyalkylene glycol lubricant with structure R—(OCHCH)—(OCH(CH)CH)—OH can be used for water-based drilling fluids. Polyalkylene glycol coats metal surfaces and creates a lubricating layer to reduce torque and drag. Adding polyalkylene glycol to high density water-based drilling fluids is an effective method for reducing frictional forces during HPHT and high salinity drilling applications. 1. A method of increasing lubricity of a water-based drilling fluid comprising adding 1-3% polyalkylene glycol to the water-based drilling fluid to form a water-based drilling fluid composition.2. The method of wherein the polyalkylene glycol is of a structure R—(OCHCH)—(OCH(CH)CH)—OH wherein:R is a saturated alkyl group with up to six carbon atoms;m and n are integers the ratio of m over n (m/n) is 0.2-5, preferably 0.5-2 andthe molecular weight is 1000-5000 g/mol.3. The method of wherein the polyalkylene glycol is of the structure wherein:R is a saturated alkyl group with 4-6 carbon atoms;m and n are integers the ratio of m over n (m/n) is 0.2-5, preferably 0.5-2; andthe molecular weight is 2000-5000 g/mol.4. The method of wherein the water-based drilling fluid further comprises at least 150 claim 2 ,000 mg/L Cl.5. The method of wherein density of the water-based drilling fluid is at least 15 ppg.6. The method of wherein the water-based drilling fluid composition has a coefficient of friction that is decreased by up to 32% after addition of the polyethylene glycol.7. The method of wherein the torque is decreased by up to 32% after addition of the polyethylene glycol.8. The method of wherein the water-based drilling fluid ...
Подробнее
