[특허]Method and apparatus for sealing pipe perforations

Method and apparatus for sealing pipe perforations 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	E21B-033/13
출원번호	US-0720044 (1991-06-24)
발명자 / 주소	Kendrick Larry N. (Lafayette LA) Savage William A. (Edmond OK)
출원인 / 주소	Conoco Inc. (Ponca City OK 02)
인용정보	피인용 횟수 : 46 인용 특허 : 0

초록 ▼

Ball sealers for flowing into casing perforation holes in a wellbore to selectively seal off those perforations receiving a disproportionately large amount of well treatment fluid being injected through the perforations. The ball sealers (22) are comprised of a spherical outer deformable shell (42) defining a central core portion filled with nondeformable particulate matter (46) which is sized small enough to flow with the shape of the deformable outer shell (42) and large enough so that as it consolidates under the force of fluid flow pressure, it will cause the outer shell to bridge over the perforation opening (18) when the force of fluid flowing into the casing (12) pushes the ball sealer (22) against and into the perforation opening (18). The particles (46) are also arranged so that when fluid flow is stopped into the casing and the fluid flow force is no longer applied to the ball seals, the particulate matter (46) will become unconsolidated to relax the bridge and permit the entrapped energy in the deformed outer shell (42) to expel the ball from the perforation opening.

대표청구항 ▼

In a well system having a wellbore with a perforated casing (12) extending into an earth formation (16), the formation and wellbore being such that during a well treatment operation in which pumpable material is pumped into the wellbore, a disproportionately large amount of material passes through certain perforations (18) in the casing, means for plugging the perforations which are receiving a disproportionate amount of materials being pumped into the wellbore, wherein said means comprises: a plurality of sealing members (22) for placement into the material being pumped into the wellbore, said sealing members being characterized by an outer shell (42) having a generally fully spherical shape when not subjected to other than gravitational forces, said shell having a diameter which is larger than the diameter of perforations (18) in the casing, said shell being constructed of a material which when subjected to forces greater than the force of gravity is deformable; and a core material (46) housed within said outer shell, said core material being flowable to follow the shape of said outer shell when said outer shell is deformed. A method of plugging perforations (18) in a casing (12) in a wellbore extending from the surface and penetrating into an earth formation (16) in conjunction with a formation treatment involving the introduction of a fluid into the wellbore at the surface, with such fluid having dispersed therein a plurality of ball sealers, and said ball sealers being sized to seal said perforations; wherein the improvement is characterized by: introducing into the fluid at the surface ball sealers being comprised of a deformable outer shell (42) having a spherical outer surface and defining an interior chamber (44) and a plurality of particles (46) within the interior chamber forming a core flowable with and capable of assuming the shape of the deformable outer shell (42); and continuing the flow of such fluid until at least a portion of the outer surface (42) of some of said ball sealers (22) has become positioned within said perforations (18) with such particles (46) flowing within the chamber (44) due to the force of the flowing fluid for forming a bridge within the outer shell across the perforations to lodge the ball sealers in the perforations.

이 특허를 인용한 특허 (46)

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Jones Lloyd G., Method and apparatus for treating long formation intervals.
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Ryan, Nicholas John, Method and compositions for delivery of a concentrated quantity of sealing elements to a leak site in a vessel.
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Trummer, Sascha; Clum, Eric; Boney, Curtis L.; Lopez de Cardenas, Jorge E.; Baser, Belgin; Swaren, Jason, Method of placing ball sealers for fluid diversion.
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Watson, Brock W.; Ferguson, Andrew M.; Schultz, Roger L.; Funkhouser, Gary P.; Robertson, Jenna N., Methods of completing a well and apparatus therefor.
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Sweatman, Ronald E.; Vargo, Jr., Richard F.; Kulakofsky, David S.; Escorcia, Alvaro; Ravi, Krishna M., Methods of discovering and correcting subterranean formation integrity problems during drilling.
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Sweatman,Ronald E.; Wang,Hong; Deeg,Wolfgang F. J., Methods of improving well bore pressure containment integrity.
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Boney, Curtis L.; Swaren, Jason; Lassek, John; Ariza, Ricardo; Rees, Desmond E.; Simon, David Ryan; Dardis, Michael A.; Davis, Darrell P., Sealing by ball sealers.
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Lynk, John M., Sliding sleeve for stimulating a horizontal wellbore, and method for completing a wellbore.
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Tolman, Randy C.; Angeles Boza, Renzo M.; Nygaard, Kris J.; Mayer, Christian S.; Entchev, Pavlin B., Systems and methods for secondary sealing of a perforation within a wellbore casing.
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Method and apparatus for sealing pipe perforations 원문보기

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