초록 ▼

Storable water-microsphere suspensions for use in well cements and methods of cementing well bores are provided. The storable water-microsphere suspensions are basically comprised of water, microspheres and an effective amount of a suspending agent selected from the group consisting of microfine or

Storable water-microsphere suspensions for use in well cements and methods of cementing well bores are provided. The storable water-microsphere suspensions are basically comprised of water, microspheres and an effective amount of a suspending agent selected from the group consisting of microfine or colloidal materials and gel forming polymers.

대표청구항 ▼

Storable water-microsphere suspensions for use in well cements and methods of cementing well bores are provided. The storable water-microsphere suspensions are basically comprised of water, microspheres and an effective amount of a suspending agent selected from the group consisting of microfine or

Storable water-microsphere suspensions for use in well cements and methods of cementing well bores are provided. The storable water-microsphere suspensions are basically comprised of water, microspheres and an effective amount of a suspending agent selected from the group consisting of microfine or colloidal materials and gel forming polymers. ections is prevented, to thereby divert the gravel slurry directly to the wellbore section associated with the open valve and open well screen. 14. A method of progressively gravel packing a subterranean wellbore, the method comprising the steps of: positioning multiple well screens in the wellbore, each of the well screens having a filtering material; isolating a continuous portion of the wellbore having the well screens disposed therein; flowing a gravel slurry into the wellbore portion; and opening successive ones of the well screens for fluid flow through the filtering material of the respective well screens. 15. The method according to claim 14, wherein the isolating step is performed by setting at least one packer in the wellbore. 16. The method according to claim 14, wherein the opening step further comprises successively providing fluid communication from the filtering material of the respective successively opened well screens to a fluid path for return circulation of a liquid portion of the gravel slurry. 17. The method according to claim 14, wherein the positioning step further comprises associating each of the well screens with a preselected corresponding one of multiple sections of the wellbore portion, and wherein the opening step further comprises individually gravel packing the sections of the wellbore portion in response to opening respective corresponding ones of the well screens. 18. The method according to claim 14, wherein the opening step further comprises opening successive ones of multiple fluid barriers in a gravel slurry delivery passage, each of the well screens being opened for fluid flow therethrough in response to opening of a corresponding respective one of the fluid barriers. 19. The method according to claim 18, wherein in the opening step, the barriers comprise frangible members which break in response to at least one predetermined pressure in the gravel slurry delivery passage. 20. The method according to claim 19, wherein in the opening step, the frangible members break in succession in response to repeated attaining of the predetermined pressure in the gravel slurry delivery passage. 21. The method according to claim 14, wherein the positioning step further comprises positioning multiple valves in the wellbore, each of the valves being associated with a corresponding one of the well screens, and wherein the opening step further comprises opening successive ones of the valves, thereby providing fluid communication between the filtering material of the respective well screens and a slurry fluid return circulation flow passage. 22. The method according to claim 21, wherein the valve opening step is performed by creating a predetermined pressure differential across successive ones of multiple frangible members. 23. The method according to claim 21, wherein the valve opening step is performed by gradually displacing a member connected to each of the valves, displacement of the member causing successive operation of the valves. 24. The method according to claim 23, wherein the gradually displacing step further comprises hydraulically metering the member displacement. 25. The method according to claim 24, wherein the hydraulically metering step is performed in response to differential pressure between a gravel slurry delivery flow passage and the slurry fluid return circulation flow passage. 26. The method according to claim 14, wherein the positioning step further comprises positioning in the wellbore a gravel slurry delivery passage having multiple openings to the wellbore, each of the openings being associated with a corresponding one of the well screens, and further comprising the step of diverting a gravel slurry from the delivery passage, through successive ones of the openings, and into the wellbore portion. 27. The method according to claim 26, wherein the diverting step further comprises displacing a plugging device through the delivery passage. 28. The method according to claim 2