Downhole pulsation system and method

A valve system utilizable with a downhole pulsation assembly, said valve system comprising:

• a mandrel cap at least partially receivable in a sub bore of a valve sub housing that is operably associated with a drill string and configured to receive a fluid from the drill string, said mandrel cap including a cap bore extending along a longitudinal axis therethrough;
• a valve assembly comprising:
• a first unit receivable in said cap bore, said first unit including a first end section, a first unit bore along a longitudinal axis therethrough, and a second end section defining one or more cavity sections in communication with said first unit bore, said cavity sections of said first unit being configured between an open position allowing fluid to pass therethrough and a closed position preventing fluid to pass therethrough;
• and
• a second unit being at least partially receivable in said cap bore, said second unit including a first end section, a second unit bore defined along a longitudinal axis therethrough, one or more ports defined laterally through a sidewall of said second unit and in communication with said second unit bore, and a second end section;
• and
• a pulsation assembly comprising:
• a rotor operably linked to said mandrel cap, said rotor having at least one rotor lobe;
• and
• a stator including a stator bore axially extending along a longitudinal axis therethrough and configured to allow fluid to pass therethrough, and at least one stator lobe, said stator bore being configured to receive said rotor;
• wherein said second end section includes a ring wall separating said cavity sections into an outer cavity and a central bore interiorly concentric with said outer cavity, said outer cavity and said central bore being in communication with said valve bore, said ring wall being configured to seat against a first object traveling from the drill string to prevent fluid flow entering said central bore.

A method of using a valve system, said method comprising the steps of:

• a) providing a valve system comprising:
• a mandrel cap at least partially receivable in a sub bore of a valve sub housing that is operably associated with a drill string, said mandrel cap including a cap bore extending along a longitudinal axis therethrough;
• and
• a valve including a first end section, a valve bore defined along a longitudinal axis therethrough, one or more ports defined laterally through a sidewall of said valve and in communication with said valve bore, and a second end section defining one or more cavity sections in communication with said valve bore, wherein at least a portion of said valve being receivable in said cap bore, wherein said second end section including a ring wall separating said cavity sections into an outer cavity and a central bore interiorly concentric with said outer cavity, said outer cavity and said central bore being in communication with said valve bore;
• b) receiving a working fluid from the drill string to said valve bore defined through said valve associated with said valve sub housing that is connected to the drill string;
• c) providing said valve in a configuration selected from the group consisting of:
• a full by-pass configuration where the working fluid is allowed to flow through said valve into said cap bore defined in said mandrel cap that is attachable to said valve;
• a partial by-pass configuration where a first object is receivable from the drill string into said valve bore to contact said ring wall defining said central bore in said valve that is in communication with said valve bore, so that the first object prevents the working fluid from exiting said central bore while allowing a portion of the working fluid to pass around said central bore by way of said outer cavity defined in said valve and in communication with said valve bore;
• and
• a no by-pass configuration where said first object is in contact with said ring wall, and where a second object is receivable from the drill string into said valve bore to prevent the working fluid from entering said outer cavity;
• and
• d) flowing at least a portion of the working fluid through said one or more ports defined laterally through said sidewall of said valve and in communication with said valve bore to an annulus defined exterior of said valve.