Systems and methods for producing forced axial vibration of a drillstring
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-004/10
E21B-028/00
E21B-004/02
E21B-017/03
출원번호
US-0497569
(2014-09-26)
등록번호
US-9644440
(2017-05-09)
발명자
/ 주소
Kerstetter, Scott
출원인 / 주소
LAGUNA OIL TOOLS, LLC
대리인 / 주소
Wendt, Jeffrey L.
인용정보
피인용 횟수 :
0인용 특허 :
44
초록▼
Systems and methods for producing forced axial vibration of a drillstring. Systems include a cam housing positioned above a drill bit in a drillstring, a rotatable cam positioned internal of the cam housing, the rotatable cam having at least one cam surface exhibiting reciprocating axial movement up
Systems and methods for producing forced axial vibration of a drillstring. Systems include a cam housing positioned above a drill bit in a drillstring, a rotatable cam positioned internal of the cam housing, the rotatable cam having at least one cam surface exhibiting reciprocating axial movement upon rotation of the rotatable cam, and a non-rotatable cam follower positioned internal surface of the cam housing and having at least one cam follower surface engaging the cam surface. The cam follower transfers the reciprocating axial movement to the drill bit. The rotatable cam is rotated by a fluid-powered positive displacement power section positioned above and mechanically attached to the rotatable cam in the drillstring to effect the rotation of the rotatable cam, and thus effect the reciprocating axial movement of the drill bit.
대표청구항▼
1. A system for producing forced axial vibration of a drillstring comprising: a cam housing positioned above a drill bit in a drillstring;a rotatable cam positioned internal of the cam housing; the rotatable cam having at least one cam surface exhibiting reciprocating axial movement upon rotation of
1. A system for producing forced axial vibration of a drillstring comprising: a cam housing positioned above a drill bit in a drillstring;a rotatable cam positioned internal of the cam housing; the rotatable cam having at least one cam surface exhibiting reciprocating axial movement upon rotation of the rotatable cam, the rotatable cam comprising a generally cylindrical body defining a central longitudinal throughbore, the body having first and second ends, the first end defining the at least one cam surface;a non-rotatable cam follower positioned internal of the cam housing and having at least one cam follower surface engaging the at least one cam surface, the non-rotatable cam follower comprising a generally cylindrical body having a central longitudinal throughbore substantially equal in diameter to that of the rotatable cam body, the cam follower body having first and second ends, the second end defining the at least one cam follower surface;the first end of the non-rotatable cam follower includes a threaded connection to a hollow, generally cylindrical mandrel, the mandrel in turn threadedly connected to the drillstring, the cam housing threadedly connected to a spline housing, the mandrel and spline housing connected through a spring-biased spline connection;the cam follower transferring the reciprocating axial movement to the drillstring producing an axial vibratory frequency to the drill string during drilling;a fluid-powered positive displacement power section positioned above and mechanically attached to the rotatable cam in the drillstring to effect the rotation of the rotatable cam, and thus effect the reciprocating axial movement of the drillstring;wherein the second end of the rotatable cam includes a connection to a first end of a solid flexible rod, the solid flexible rod contained within a pin sub, the first end of the solid flexible rod including passages extending from an external surface of the solid flexible rod to the central longitudinal throughbore of the rotatable cam, the solid flexible rod having a second end connected to a lower end of a solid rotatable rotor of the fluid-powered positive displacement power section. 2. The system according to claim 1 wherein the at least one cam housing, and fluid-powered positive displacement power section are generally cylindrical. 3. The system according to claim 1 wherein: the at least one cam surface comprises at least one cam feature for reciprocating the cam follower axially upon rotational movement of the rotatable cam. 4. The system according to claim 3 wherein: the at least one cam surface comprises at least one portion of a circumferential gradually rising slope followed by an abrupt cliff; andthe at least one cam follower surface mirrors the at least one cam surface. 5. The system according to claim 1 wherein the pin sub is threadedly connected to the cam housing and a housing of the fluid-powered positive displacement power section. 6. A system for producing forced axial vibration of a drillstring comprising: a generally cylindrical cam housing positioned above a drill bit in a drillstring;a generally cylindrical rotatable cam body positioned internal of the cam housing, the rotatable cam body defining a central longitudinal throughbore and first and second ends, the first end defining at least one cam surface exhibiting reciprocating axial movement upon rotation of the rotatable cam, the at least one cam surface comprising at least one portion of a circumferential gradually rising slope followed by an abrupt cliff;a generally cylindrical non-rotatable cam follower body fixed to an internal surface of the cam housing and having an external diameter and central longitudinal throughbore substantially equal to those of the rotatable cam body, the cam follower body having first and second ends, the first end abutting a spring positioned in the cam housing, the second end defining at least one cam follower surface configured to engage the at least one cam surface, the at least one cam follower surface configured to mirror the at least one cam surface;the rotatable cam and cam follower producing an axial vibratory frequency to the drillstring during drilling;a fluid-powered positive displacement power section positioned above and mechanically attached to the second end of the rotatable cam in the drillstring via a solid flexible rod to effect the rotation of the rotatable cam, and thus effect the axial vibratory frequency to the drillstring;the second end of the rotatable cam connected to a first end of the solid flexible rod, the solid flexible rod contained within a pin sub, the first end of the solid flexible rod including passages extending from an external surface of the solid flexible rod to the central longitudinal throughbore of the rotatable cam, the solid flexible rod having a second end connected to a lower end of a solid rotatable rotor of the fluid-powered positive displacement power section;the pin sub is threadedly connected to the cam housing and a housing of the fluid-powered positive displacement power section;the first end of cam follower includes a threaded connection to a hollow, generally cylindrical mandrel, the mandrel in turn threadedly connected to the drillstring; and wherein the cam housing is threadedly connected to a spline housing, and the mandrel and spline housing are connected through a spring-biased spline connection. 7. A method of producing forced axial vibration of a drillstring, comprising: a) in no specific order, connecting a cam housing above a drill bit in a drill string;connecting a rotatable cam to a solid flexible rod output shaft of a positive displacement power section having a solid rotatable rotor and a stationary stator external of the rotor, the solid flexible rod in turn connected to a lower end of the solid rotatable rotor of the power section;positioning the rotatable cam internal of the cam housing, the rotatable cam having at least one cam surface exhibiting reciprocating axial movement upon rotation of the rotatable cam;positioning a non-rotatable cam follower having first and second ends internal of the cam housing, the cam follower having at least one cam follower surface on its second end engaging the at least one cam surface;positioning a spring in the cam housing abutting the first end of the non-rotatable cam follower,threading the first end of the non-rotatable cam follower to a hollow, generally cylindrical mandrel, the mandrel in turn threadedly connected to the drillstring the cam housing threadedly connected to a spline housing, the mandrel and spline housing connected through a spring-biased spline connection;b) forcing drilling fluid through the positive displacement power section outside of the solid rotatable rotor and solid flexible rod, and through passages in the first end of the solid flexible rod extending from an external surface of the solid flexible rod to the central longitudinal throughbore of the rotatable cam, rotating the solid rotatable rotor, the solid flexible rod, and the rotatable cam, and causing reciprocating axial movement of the cam follower;c) transferring the reciprocating axial movement of the cam follower to drillstring causing forced axial vibration of the drillstring. 8. The method of claim 7 wherein the rotating is sufficient to produce a vibration frequency of the drillstring ranging from about 1 hit per 20 seconds up to about 10 hits per second. 9. The method of claim 8 wherein the frequency ranges from about 1 hit per 10 seconds up to about 5 hits per second. 10. The method of claim 9 wherein the frequency is about two hits per second.
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