US 10,480,270 B2Granted

Downhole impact apparatus

AssigneeImpact Selector International, LLC

InventorJames P. Massey

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Abstract

An impact apparatus operable to be coupled along and impart an impact to a downhole tool string. The impact apparatus includes a housing, a first and second chambers within the housing, and a piston shaft assembly movable with respect to the housing. The piston shaft assembly includes a first piston slidably disposed within and dividing the first chamber into a first chamber portion and a second chamber portion, a first shaft connected with the first piston and axially movable into and out of the housing, a second piston slidably disposed within the second chamber, and a second shaft connecting the first and second pistons. The first chamber portion is open to a space external to the housing. The second chamber contains a fluid operable to maintain the piston shaft assembly and the housing in a predetermined relative position.

Claims16

Dependent claims

An apparatus comprising:

an impact tool operable to be coupled between portions of a tool string conveyable within a wellbore extending into a subterranean formation, and to impart an impact force to the tool string, wherein the impact tool comprises:
a first chamber within a housing;
a second chamber within the housing;
a piston shaft assembly axially movable with respect to the housing and comprising:
a first piston slidably disposed within the first chamber and dividing the first chamber into a first chamber portion and a second chamber portion, wherein the first chamber portion is open to a space external to the housing;
a first shaft connected with the first piston and axially movable into and out of the housing;
a second piston slidably disposed within the second chamber;
and
a second shaft connecting the first and second pistons, wherein the second chamber contains a fluid operable to maintain the piston shaft assembly and the housing in a predetermined relative position;
and
a fluid control device operable to permit flow of the fluid into and out of the second chamber to permit relative movement between the piston shaft assembly and the housing, wherein the fluid control device is operable to:
block flow of the fluid contained within the second chamber to maintain the piston shaft assembly and the housing in the predetermined relative position;
and
selectively permit flow of the fluid into and out of the second chamber to permit the relative movement between the piston shaft assembly and the housing.

11 more elements

An apparatus comprising:

an impact tool operable to be coupled between portions of a tool string conveyable within a wellbore extending into a subterranean formation, and to impart an impact force to the tool string, wherein the impact tool comprises:
a first chamber within a housing;
a second chamber within the housing;
a piston shaft assembly axially movable with respect to the housing and comprising:
a first piston slidably disposed within the first chamber and dividing the first chamber into a first chamber portion and a second chamber portion, wherein the first chamber portion is open to a space external to the housing;
a first shaft connected with the first piston and axially movable into and out of the housing;
a second piston slidably disposed within the second chamber;
and
a second shaft connecting the first and second pistons, wherein the second chamber contains a fluid operable to maintain the piston shaft assembly and the housing in a predetermined relative position;
and
a fluid control device operable to permit flow of the fluid into and out of the second chamber to permit relative movement between the piston shaft assembly and the housing;
wherein the second piston divides the second chamber into a third chamber portion and a fourth chamber portion, wherein the third chamber portion contains the fluid, and wherein the fluid control device is operable to permit the fluid to flow out of the third chamber portion to permit the relative movement between the piston shaft assembly and the housing;
and
wherein the impact tool further comprises a third chamber, and wherein the fluid control device is operable to permit flow of the fluid out of the third chamber portion into the third chamber to permit the relative movement between the piston shaft assembly and the housing.

11 more elements

An apparatus comprising:

an impact tool operable to be coupled between portions of a tool string conveyable within a wellbore extending into a subterranean formation, and to impart an impact force to the tool string, wherein the impact tool comprises:
a first chamber within a housing;
a second chamber within the housing;
and
a piston shaft assembly axially movable with respect to the housing and comprising:
a first piston slidably disposed within the first chamber and dividing the first chamber into a first chamber portion and a second chamber portion, wherein the first chamber portion is open to a space external to the housing;
a first shaft connected with the first piston and axially movable into and out of the housing;
a second piston slidably disposed within the second chamber;
and
a second shaft connecting the first and second pistons, wherein the second chamber contains a fluid operable to maintain the piston shaft assembly and the housing in a predetermined relative position;
wherein, when the impact tool is conveyed within the wellbore:
a first pressure within the first chamber portion is substantially equal to hydrostatic wellbore pressure within the space external to the housing;
a second pressure within the second chamber portion is maintained substantially lower than the first pressure within the first chamber portion;
a pressure differential between the first and second pressures urges relative movement between the piston shaft assembly and the housing;
and
the relative movement between the piston shaft assembly and the housing terminates with an impact between the piston shaft assembly and the housing.

13 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/803,799Filed 5 Nov 2017 · us provisional application
Priority: 19 May 2017
Published: US 2018/0334874 A122 Nov 2018
Granted: 19 Nov 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification2 codes

E21B 31/1135
Hydraulically-operated: jars with a hydraulic impedance mechanism, i.e. a restriction, for initially delaying escape of a restraining fluid
E21B
Earth or rock drilling

Family

Application62/508,905Us provisional application · filed 19 May 2017
US 2018/0334874 A1Pre-grant publication · published 22 Nov 2018
US 10,480,270 B2This patent

From the US filing history. Foreign family members aren’t listed.

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