Downhole safety valve for subterranean well and method

Apparatus for effecting the downhole severing of a radially, inwardly directed hollow protuberance on the tubular wall of a valve housing, said tubular wall also defining a no-go shoulder above said protuberance comprising, in combination:

• a tool sleeve axially slidably mounted within said tubular wall above said hollow protuberance;
• a cutting tool mounted on said tool sleeve in axial alignment with said hollow protuberance;
• an outer sleeve assembly having an external shoulder engagable with said no-go shoulder;
• an inner sleeve assembly telescopically traversing said outer sleeve;
• means on the top end of said inner sleeve for rigid connection to a wireline incorporating a jar mechanism;
• a mandrel telescopically inserted through said inner sleeve assembly;
• a collet having a ring portion and peripherally spaced, axially extending collet arms terminating in enlarged head portions;
• means for securing said collet ring portion to said mandrel with said enlarged head portions disposed above and adjacent to said tool sleeve;
• means including an axially extending slot in said inner sleeve for rigidly connecting said outer sleeve and said mandrel;
• shearable means for securing said inner sleeve relative to said mandrel and outer sleeve during run-in;
• and
• means on said inner sleeve assembly for radially expanding said collet heads into operative engagement with said tool sleeve, whereby downward jarring movement imparted to said inner sleeve by said wireline shears said shearable means, engages said collet heads with said tool sleeve and moves said cutting tool through said protuberance.

In a full bore downhole safety valve for a subterranean well having a tubular upper sub defining in its wall a downwardly extending fluid conduit for transmitting control fluid to a fluid pressure cylinder for shifting a valve actuator sleeve within the bore of the upper sub to its valve opening position, said valve actuator sleeve having a bore sized to permit passage of wireline tools through the bore opening of the full bore safety valve, the improvement comprising:

• an annular recess in the inner wall of said upper sub above the uppermost position of the valve actuator sleeve;
• an integral hollow protuberance projecting radially into said annular recess but terminating short of the bore diameter of said valve actuator sleeve, thereby eliminating interference with wireline tools to be passed through the full bore safety valve;
• said hollow portion of said protuberance communicating with said control fluid conduit;
• a cutting tool sleeve mounted in said annular recess for axial movement;
• said cutting tool sleeve having an inner bore diameter not less than said valve actuator sleeve;
• a cutting tool fixedly mounted on said cutting tool sleeve and engagable with said protuberance in cutting relation by downward movement of said cutting tool sleeve;
• and
• wireline carried means for imparting downward jarring forces to said cutting tool sleeve for severing said protuberance and establishing fluid communication between the bore of the upper sub and said control fluid conduit.

The method of providing communication with a fluid passage disposed in the tubular wall of an installed downhole well tool comprising the steps of:

• (1) prior to installation of the downhole tool;
• (a) providing integral annular internal shoulder on the tubular wall of the downhole tool adjacent said fluid passage;
• (b) drilling a hole through said tubular wall to communicate with said fluid passage and extend into, but not through said annular internal shoulder;
• (2) installing said downhole tool in the well;
• and
• (3) axially cutting a slot in said annular shoulder, said slots traversing the inner end of said hole to provide fluid communication with said axial passage.

The method of providing communication with a fluid passage disposed in the tubular wall of an installed downhole well tool comprising the steps of:

• (1) prior to installation of the downhole tool;
• (a) providing integral annular internal shoulder on the tubular wall of the downhole tool adjacent said fluid passage;
• (b) drilling a hole through said tubular wall to communicate with said fluid passage and extend into, but not through said annular internal shoulder;
• (c) mounting a cutting tool in said down hole tool axially adjacent the inner end of said hole;
• (2) installing said downhole tool in the well;
• and
• (3) axially moving said cutting tool by wireline into cutting engagement with said shoulder to cut a slot therethrough to expose the inner end of said hole.

The method of establishing communication with a control fluid conduit provided in the tubular wall of a fluid pressure operated downhole tool comprising the steps of:

• providing an internally projecting integral protuberance on the inner surface of said tubular wall;
• extending a portion of said control fluid conduit into, but not through said protuberance so that the inner end of said extension portion is disposed within the bore of said tubular wall;
• removing said protuberance in its downhole location by an auxiliary tool to expose the bore of said extension portion of said control fluid conduit;
• mounting the cutting tool on a sleeve;
• inserting said sleeve in the bore of said tubular wall of said well tool at the wall surface;
• actuating said sleeve in its downhole location to move said cutting tool through said protuberance;
• providing a no-go shoulder on the inner surface of said tubular wall at a location vertically adjacent said sleeve;
• providing a wireline tool comprising an outer sleeve having an external shoulder engagable with said no-go shoulder, an inner sleeve telescoped within said outer sleeve and having an upper end rigidly connected to a wireline having serially connected jars therein, and a mandrel traversing the bore of said inner sleeve but secured to said outer sleeve by a pin traversing an axial slot in said inner sleeve, said mandrel carrying a collet having spring biased heads disposed adjacent said cutting tool sleeve in a radially retracted position when said wireline tool engages said no-go shoulder;
• shearably securing said inner sleeve to said mandrel;
• lowering said wireline tool into the well to engage said outer sleeve with said no-go shoulder;
• imparting downward jarring forces by said wireline to said inner sleeve to release the shearable securement of said inner sleeve and said mandrel;
• and
• moving said inner sleeve into engagement with said collet heads to radially expand said collet heads into abutting engagement with said cutting tool sleeve, whereby further downward jarring movements of said wireline effects the cutting off of said protuberance by said cutting tool.