초록 ▼

Implementations described herein are directed to a pressure pulse well tool, which may include an upper valve assembly configured to move between a start position and a stop position in a housing. The pressure pulse well tool may also include an activation valve subassembly disposed within the upper

Implementations described herein are directed to a pressure pulse well tool, which may include an upper valve assembly configured to move between a start position and a stop position in a housing. The pressure pulse well tool may also include an activation valve subassembly disposed within the upper valve assembly. The activation valve subassembly may be configured to restrict a fluid flow through the upper valve assembly and increase a fluid pressure across the upper valve assembly. The pressure pulse well tool may further include a lower valve assembly disposed inside the housing and configured to receive the fluid flow from the upper valve assembly. The lower valve assembly may be configured to separate from the upper valve assembly after the upper valve assembly reaches the stop position, causing the fluid flow to pass through the lower valve assembly and to decrease the fluid pressure across the upper valve assembly.

대표청구항 ▼

1. A pressure pulse well tool, comprising: an upper valve assembly configured to move between a start position and a stop position in a housing, wherein the upper valve assembly comprises an upper biasing mechanism configured to bias the upper valve assembly into the start position;an activation val

1. A pressure pulse well tool, comprising: an upper valve assembly configured to move between a start position and a stop position in a housing, wherein the upper valve assembly comprises an upper biasing mechanism configured to bias the upper valve assembly into the start position;an activation valve subassembly disposed within the upper valve assembly, wherein the activation valve subassembly is configured to move to restrict a fluid flow through the upper valve assembly and increase a fluid pressure across the upper valve assembly, thereby causing the upper valve assembly to move to the stop position in response to the increase of the fluid pressure; anda lower valve assembly disposed inside the housing and configured to receive the fluid flow from the upper valve assembly, wherein the lower valve assembly comprises a lower biasing mechanism configured to bias the lower valve assembly into contact with the upper valve assembly, and wherein the lower valve assembly is configured to separate from the upper valve assembly after the upper valve assembly reaches the stop position, thereby causing the fluid flow to pass through the lower valve assembly and to decrease the fluid pressure across the upper valve assembly. 2. The pressure pulse well tool of claim 1, wherein the upper biasing mechanism is configured to bias the upper valve assembly in an uphole direction, and wherein the lower biasing mechanism is configured to bias the lower valve assembly in the uphole direction. 3. The pressure pulse well tool of claim 1, wherein the upper valve assembly is in the start position when seated against an upper shoulder of the housing, and wherein the upper valve assembly is in the stop position when seated against a lower shoulder of the housing. 4. The pressure pulse well tool of claim 1, wherein the lower biasing mechanism is configured to bias a lower valve seat of the lower valve assembly into forming a seal with an upper valve seat of the upper valve assembly. 5. The pressure pulse well tool of claim 1, wherein the activation valve subassembly is configured to allow the fluid flow to pass through the upper valve assembly when a flow rate of the fluid flow is less than a predetermined threshold flow rate and to restrict fluid flow through the upper valve assembly when the flow rate is greater than or equal to the predetermined threshold flow rate. 6. The pressure pulse well tool of claim 5, wherein the fluid flow through the upper valve assembly passes through an annular restriction in the upper valve assembly, the annular restriction being positioned around at least a portion of the activation valve subassembly. 7. The pressure pulse well tool of claim 6, wherein the annular restriction is formed by an outer diameter of a plunger of the activation valve subassembly and a bore of the upper valve assembly. 8. The pressure pulse well tool of claim 5, wherein the lower and upper valve assemblies are configured such that the decrease of the fluid pressure across the upper valve assembly in response to separation of the lower valve assembly from the upper valve assembly causes the upper biasing member to overcome the fluid pressure across the upper valve assembly and to move the upper valve assembly toward the start position. 9. The pressure pulse well tool of claim 5, wherein the activation valve subassembly comprises: a plunger configured to form a seal within the upper valve assembly; andan activation biasing mechanism, wherein the plunger is configured to overcome a bias of the activation biasing mechanism to form the seal when the flow rate is greater than or equal to the predetermined threshold flow rate. 10. The pressure pulse well tool of claim 1, wherein the upper valve assembly is configured to overcome a bias of the upper biasing mechanism when moving from the start position to the stop position in a downhole direction. 11. The pressure pulse well tool of claim 1, wherein the lower valve assembly is configured to move in conjunction with the upper valve assembly in a downhole direction when the upper valve assembly moves from the start position to the stop position. 12. The pressure pulse well tool of claim 11, wherein the lower valve assembly is configured to maintain a seal with the upper valve assembly when the upper valve assembly moves from the start position to the stop position. 13. The pressure pulse well tool of claim 11, wherein the lower valve assembly is configured to overcome a bias of the lower biasing mechanism when moving in conjunction with the upper valve assembly. 14. The pressure pulse well tool of claim 1, wherein the upper biasing mechanism is configured to return the upper valve assembly to the start position in response to the lower valve assembly separating from the upper valve assembly. 15. The pressure pulse well tool of claim 14, wherein the lower biasing mechanism is configured to reestablish contact with the upper valve assembly in response to the upper valve assembly returning to the start position. 16. A method for generating a pressure pulse, comprising: (a) restricting a fluid flow through an upper valve assembly by moving an activation valve subassembly disposed within the upper valve assembly, the movement of the activation valve subassembly increasing a fluid pressure across the upper valve assembly;(b) moving the upper valve assembly from a start position to a stop position in response to the increase in fluid pressure across the upper valve assembly; and(c) separating a lower valve assembly from the upper valve assembly after the upper valve assembly moves to the stop position, thereby causing the fluid flow to pass through a bore within the lower valve assembly and to decrease the fluid pressure across the upper valve assembly. 17. The method of claim 16, further comprising: moving the activation valve subassembly and thereby restricting the fluid flow through the upper valve assembly when a flow rate of the fluid flow is greater than or equal to a predetermined threshold flow rate. 18. The method of claim 17, further comprising: after separating the lower valve assembly from the upper valve assembly and while maintaining the fluid flow greater than or equal to the predetermined threshold flow rate: moving the upper valve assembly to the start position using an upper biasing mechanism; andmoving the lower valve assembly into contact with the upper valve assembly using a lower biasing mechanism. 19. The method of claim 16, further comprising: maintaining a seal between the lower valve assembly and the upper valve assembly when moving the upper valve assembly from the start position to the stop position. 20. The method of claim 16, further comprising: (d) moving the upper valve assembly from the stop position to the start position in response to a decrease in fluid pressure across the upper valve assembly; and(e) moving the lower valve assembly into contact with the upper valve assembly after the upper valve assembly returns to the start position; and(f) repeating (a)-(e) while a flow rate of the fluid flow remains greater than or equal to a predetermined threshold flow rate.