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51. 发明专利

BG48574A3 MULTISTEP METHOD FOR TREATMENT OF COAL LAYERS 未知
公开(公告)号：BG48574A3
公开(公告)日：1991-03-15
申请号：BG8000187
申请日：1987-06-03
申请人： PERLMAN WILLIAM
发明人： PERLMAN WILLIAM
IPC分类号： C09K8/72 , E21B43/00 , E21B43/26 , E21B43/267 , E21B43/27
摘要： An improved method of multiple-stage hydraulic fracturing of coal seams to improve the rate and total recovery of gas therefrom. In one aspect, the improvement comprises completing the well with 7-inch or larger casing and 31/2 inch or larger tubing. In another aspect, the stagewise fracturing is continued until the following quantity of 60-140 mesh proppants has been deposited in the formation: -for 5 /= 500,000; -for 10 /= 750,000; -for 15 /= 1,000,000; -for 20 /= 2,000,000; and -for h >/= 25, m >/= 3,000,000; - wherein h is the vertical thickness of the coal seam in feet and m is the minimum quantity of the fine proppants in pounds deposited therein. In another aspect, a coal seam fractured by the multiple-stage method is refractured after producing or shutting in the well for a period of time to permit closure of the fractures on the proppant placed therein in the earlier multiple-stage fracturing of the coal seam.

52. 发明专利

IE55829B1 COAL SEAM FRACING METHOD 未知
公开(公告)号：IE55829B1
公开(公告)日：1991-01-30
申请号：IE289884
申请日：1984-11-12
申请人： PERLMAN WILLIAM
IPC分类号： E21B43/00 , E21B43/26
摘要： A method of hydraulically fracturing subterranean coal seams to improve the rate and total recovery of gas therefrom. The coal seam is fractured with acid and a proppant-laden fracing fluid in alternating injection stages. The initial injection stage of the fracturing fluid contains from about 0 to about 4 pounds of a spherical proppant having a particle size distribution substantially between 60 and 140 mesh. The subsequent fracing fluid injection stages are alternated with injection stages of a smaller volume of acid. The proppant loading in the fracing fluid is increased with each injection stage until the loading is from about 8 to about 12 pounds of proppant per gallon of fluid. The subsequent and terminal fracing fluid injection stages are with the higher proppant loading. Preferably, the volume of the fracing fluid injection stages is increased in successive stages from about 2000 to about 4000 gallons per stage initially to from about 6000 to about 8000 gallons per stage in the subsequent and terminal stages. The terminal fracing fluid injection stage is followed by a flushing of the well with a proppant-free fluid.

53. 发明专利

GB2184470B IMPROVED MULTIPLE-STAGE COAL SEAM FRACING METHOD 未知
公开(公告)号：GB2184470B
公开(公告)日：1988-06-22
申请号：GB8703893
申请日：1987-02-19
申请人： PERLMAN WILLIAM
发明人： PERLMAN WILLIAM
IPC分类号： C09K8/72 , E21B43/00 , E21B43/26 , E21B43/267 , E21B43/27
摘要： An improved method of multiple-stage hydraulic fracturing of coal seams to improve the rate and total recovery of gas therefrom. In one aspect, the improvement comprises completing the well with 7-inch or larger casing and 31/2 inch or larger tubing. In another aspect, the stagewise fracturing is continued until the following quantity of 60-140 mesh proppants has been deposited in the formation: -for 5 /= 500,000; -for 10 /= 750,000; -for 15 /= 1,000,000; -for 20 /= 2,000,000; and -for h >/= 25, m >/= 3,000,000; - wherein h is the vertical thickness of the coal seam in feet and m is the minimum quantity of the fine proppants in pounds deposited therein. In another aspect, a coal seam fractured by the multiple-stage method is refractured after producing or shutting in the well for a period of time to permit closure of the fractures on the proppant placed therein in the earlier multiple-stage fracturing of the coal seam.

54. 发明专利

FR2595753A1 未知
公开(公告)号：FR2595753A1
公开(公告)日：1987-09-18
申请号：FR8519296
申请日：1985-12-27
申请人： PERLMAN WILLIAM
IPC分类号： C09K8/72 , E21B43/00 , E21B43/26 , E21B43/267 , E21B43/27
摘要： An improved method of multiple-stage hydraulic fracturing of coal seams to improve the rate and total recovery of gas therefrom. In one aspect, the improvement comprises completing the well with 7-inch or larger casing and 31/2 inch or larger tubing. In another aspect, the stagewise fracturing is continued until the following quantity of 60-140 mesh proppants has been deposited in the formation: -for 5 /= 500,000; -for 10 /= 750,000; -for 15 /= 1,000,000; -for 20 /= 2,000,000; and -for h >/= 25, m >/= 3,000,000; - wherein h is the vertical thickness of the coal seam in feet and m is the minimum quantity of the fine proppants in pounds deposited therein. In another aspect, a coal seam fractured by the multiple-stage method is refractured after producing or shutting in the well for a period of time to permit closure of the fractures on the proppant placed therein in the earlier multiple-stage fracturing of the coal seam.

55. 发明专利

GB2184471A MULTIPLE-STAGE COAL SEAM FRACING METHOD 未知
公开(公告)号：GB2184471A
公开(公告)日：1987-06-24
申请号：GB8703894
申请日：1987-02-19
申请人： PERLMAN WILLIAM
发明人： PERLMAN WILLIAM
IPC分类号： C09K8/72 , E21B43/00 , E21B43/26 , E21B43/267 , E21B43/27
摘要： An improved method of multiple-stage hydraulic fracturing of coal seams to improve the rate and total recovery of gas therefrom. In one aspect, the improvement comprises completing the well with 7-inch or larger casing and 31/2 inch or larger tubing. In another aspect, the stagewise fracturing is continued until the following quantity of 60-140 mesh proppants has been deposited in the formation: -for 5 /= 500,000; -for 10 /= 750,000; -for 15 /= 1,000,000; -for 20 /= 2,000,000; and -for h >/= 25, m >/= 3,000,000; - wherein h is the vertical thickness of the coal seam in feet and m is the minimum quantity of the fine proppants in pounds deposited therein. In another aspect, a coal seam fractured by the multiple-stage method is refractured after producing or shutting in the well for a period of time to permit closure of the fractures on the proppant placed therein in the earlier multiple-stage fracturing of the coal seam.

56. 发明专利

SE8702542D0 未知
公开(公告)号：SE8702542D0
公开(公告)日：1987-06-17
申请号：SE8702542
申请日：1987-06-17
申请人： PERLMAN WILLIAM
发明人： PERLMAN WILLIAM
IPC分类号： C09K8/72 , E21B43/00 , E21B43/26 , E21B43/267 , E21B43/27
摘要： An improved method of multiple-stage hydraulic fracturing of coal seams to improve the rate and total recovery of gas therefrom. In one aspect, the improvement comprises completing the well with 7-inch or larger casing and 31/2 inch or larger tubing. In another aspect, the stagewise fracturing is continued until the following quantity of 60-140 mesh proppants has been deposited in the formation: -for 5 /= 500,000; -for 10 /= 750,000; -for 15 /= 1,000,000; -for 20 /= 2,000,000; and -for h >/= 25, m >/= 3,000,000; - wherein h is the vertical thickness of the coal seam in feet and m is the minimum quantity of the fine proppants in pounds deposited therein. In another aspect, a coal seam fractured by the multiple-stage method is refractured after producing or shutting in the well for a period of time to permit closure of the fractures on the proppant placed therein in the earlier multiple-stage fracturing of the coal seam.

57. 发明专利

NO872472D0 未知
公开(公告)号：NO872472D0
公开(公告)日：1987-06-15
申请号：NO872472
申请日：1987-06-15
申请人： PERLMAN WILLIAM
发明人： PERLMAN WILLIAM
IPC分类号： E21B43/00 , E21B43/267 , E21B43/27

58. 发明专利

ZA8607547B MULTIPLE-STAGE COAL SEAM FRACING METHOD 未知
公开(公告)号：ZA8607547B
公开(公告)日：1987-05-27
申请号：ZA8607547
申请日：1986-10-02
申请人： PERLMAN WILLIAM
发明人： PERLMAN WILLIAM
IPC分类号： C09K8/72 , E21B43/00 , E21B43/26 , E21B43/267 , E21B
CPC分类号： C09K8/72 , E21B43/006 , E21B43/26 , E21B43/267

59. 发明专利

LU85677A1 未知
公开(公告)号：LU85677A1
公开(公告)日：1986-07-17
申请号：LU85677
申请日：1984-12-11
申请人： PERLMAN WILLIAM
发明人： PERLMAN WILLIAM
IPC分类号： E21B43/00 , E21B43/26 , E21C
摘要： A method of hydraulically fracturing subterranean coal seams to improve the rate and total recovery of gas therefrom. The coal seam is fractured with acid and a proppant-laden fracing fluid in alternating injection stages. The initial injection stage of the fracturing fluid contains from about 0 to about 4 pounds of a spherical proppant having a particle size distribution substantially between 60 and 140 mesh. The subsequent fracing fluid injection stages are alternated with injection stages of a smaller volume of acid. The proppant loading in the fracing fluid is increased with each injection stage until the loading is from about 8 to about 12 pounds of proppant per gallon of fluid. The subsequent and terminal fracing fluid injection stages are with the higher proppant loading. Preferably, the volume of the fracing fluid injection stages is increased in successive stages from about 2000 to about 4000 gallons per stage initially to from about 6000 to about 8000 gallons per stage in the subsequent and terminal stages. The terminal fracing fluid injection stage is followed by a flushing of the well with a proppant-free fluid.

60. 发明专利

DE3445692A1 未知
公开(公告)号：DE3445692A1
公开(公告)日：1986-01-23
申请号：DE3445692
申请日：1984-12-14
申请人： PERLMAN WILLIAM
发明人： PERLMAN WILLIAM
IPC分类号： E21B43/00 , E21B43/26 , E21F7/00
摘要： A method of hydraulically fracturing subterranean coal seams to improve the rate and total recovery of gas therefrom. The coal seam is fractured with acid and a proppant-laden fracing fluid in alternating injection stages. The initial injection stage of the fracturing fluid contains from about 0 to about 4 pounds of a spherical proppant having a particle size distribution substantially between 60 and 140 mesh. The subsequent fracing fluid injection stages are alternated with injection stages of a smaller volume of acid. The proppant loading in the fracing fluid is increased with each injection stage until the loading is from about 8 to about 12 pounds of proppant per gallon of fluid. The subsequent and terminal fracing fluid injection stages are with the higher proppant loading. Preferably, the volume of the fracing fluid injection stages is increased in successive stages from about 2000 to about 4000 gallons per stage initially to from about 6000 to about 8000 gallons per stage in the subsequent and terminal stages. The terminal fracing fluid injection stage is followed by a flushing of the well with a proppant-free fluid.

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