ClassID:

135407

E21B23/02 - CPC Classification

Classification description:

Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for locking the tools or the like in landing nipples or in recesses between adjacent sections of tubing

Recent Application in this class:
#1
20260049531
2026-02-19

LATCH COLLET INCLUDING UNIQUE TORQUE BUTTONS

#2
20260009301
2026-01-08

LATCH COUPLING INCLUDING UNIQUE AXIAL ALIGNMENT SLOTS

#3
20250376902
2025-12-11

LATCH COLLET INCLUDING UNIQUE COLLET PROP BUTTONS

#4
20250277419
2025-09-04

TWO-PART DRILLING AND RUNNING TOOL INCLUDING A ONE WAY MECHANISM

#5
20250237124
2025-07-24

GAS LIFT LATCH

#6
20250179890
2025-06-05

Downhole Orienting Helix for Operations Requiring Multiple Orienting Sequences

#7
20250172049
2025-05-29

ELECTRICAL DOWNHOLE BACKDRIVABLE (EDB) ACTUATOR

#8
20250154831
2025-05-15

DOWNHOLE TOOL, METHOD, AND SYSTEM

#9
20250084731
2025-03-13

MAGNETICALLY COUPLED SUBSURFACE SAFETY VALVE

#10
20250052123
2025-02-13

DEPLOYMENT TOOL AND METHOD

#11
20250051628
2025-02-13

HTHP CORROSION RESISTANT COMPOSITE SEAL VIA RECRYSTALLIZATION OF REACTIVE COMPOSITE: FORMULATION AND DEPLOYMENT

#12
20250043648
2025-02-06

FLUID CONNECTION AND SEAL USEFUL AT WELLHEADS

#13
20250034960
2025-01-30

Method and system for suspending a drill string and isolating a wellbore

#14
20240418048
2024-12-19

SYSTEM AND METHOD FOR SEALING A TUBING STRING

#15
20240410241
2024-12-12

COMPLETION LOCATOR ASSEMBLY

#16
20240401425
2024-12-05

Swivel Sub With Intermediate Lug For Extended Rotation

#17
20240376798
2024-11-14

TUBING INSERT ISOLATION VALVE FOR USE WITH LEGACY WELLS, AND METHODS OF USE THEREOF

#18
20240318546
2024-09-26

System and Method for Orienting and Anchoring Downhole Tools

#19
20240271497
2024-08-15

METHOD AND SYSTEM FOR POSITIONING A MAGNETIC FLUID CONDITIONER

#20
20240271495
2024-08-15

RUNNING AND RETRIEVAL TOOL

#21
20240229602
2024-07-11

Wireline retrievable auto Y-tool

#22
20240229573
2024-07-11

CENTRALIZER FOR DOWNHOLE PROBES

#23
20240191585
2024-06-13

Latch assembly

#24
20240133249
2024-04-25

Centralizer for downhole probes

#25
20240117713
2024-04-11

TWO-PART DRILLING AND RUNNING TOOL INCLUDING A ONE WAY MECHANISM

#26
20240117712
2024-04-11

LATCH COLLET INCLUDING UNIQUE TORQUE BUTTONS

#27
20240117701
2024-04-11

DOWNHOLE TOOL INCLUDING A PACKER ASSEMBLY

#28
20240117693
2024-04-11

DOWNHOLE TOOL INCLUDING A BORE SENSOR

#29
20240117686
2024-04-11

LATCH COLLET INCLUDING UNIQUE COLLET PROP BUTTONS

#30
20240117685
2024-04-11

LATCH COUPLING INCLUDING UNIQUE AXIAL ALIGNMENT SLOTS

#31
20240102369
2024-03-28

DEPLOYING AN ARTIFICIAL LIFT SYSTEM ON CABLE

#32
20240084662
2024-03-14

BI-DIRECTIONAL WELLHEAD ANNULUS PACKOFF WITH INTEGRAL SEAL AND HANGER LOCKDOWN RING

#33
20240076947
2024-03-07

Washout mitigation

#34
20240060374
2024-02-22

Nipple-less well completion

#35
20240052715
2024-02-15

Asymmetric release device, method, and system

#36
20240026777
2024-01-25

SMART WELLHEAD

#37
20230399919
2023-12-14

Magnetically coupled subsurface safety valve

#38
20230399906
2023-12-14

Single trip, debris tolerant lock mandrel with equalizing prong

#39
20230399905
2023-12-14

Open hole tieback completion pressure activated backpressure valve, system, and method

#40
20230374893
2023-11-23

COLLET BAFFLE, A TOOL INCORPORATING SAME, AND A SYSTEM AND METHOD INCORPORATING SAME, FOR PERFORATING AND FRACKING A WELLBORE NOT HAVING INITIAL PORTS OR SLIDING SLEEVES

#41
20230358110
2023-11-09

Method for isolation of borehole pressure while performing a borehole operation in a pressure isolated borehole zone

#42
20230340851
2023-10-26

Locking fluid connection with seal

#43
20230323752
2023-10-12

INDEXING INJECTION VALVE, METHOD, AND SYSTEM

#44
20230304381
2023-09-28

Snub friendly wellhead hanger

#45
20230304369
2023-09-28

Method and system for multilateral quick access in oil and gas industry

#46
20230272687
2023-08-31

Fluid connection assembly with adapter release

#47
20230272681
2023-08-31

REMOVING WELLBORE COMPLETION COMPONENTS IN A WELLBORE

#48
20230265738
2023-08-24

Safety plug

#49
20230250707
2023-08-10

Object carrier, tool, method, and system

#50
20230235647
2023-07-27

MULTILATERAL JUNCTION WITH TWISTED MAINBORE AND LATERAL BORE LEGS

#51
20230220746
2023-07-13

Liquid spring communication sub

#52
20230160273
2023-05-25

Oil field tool latch system and method

#53
20230151713
2023-05-18

Lock tool for a subsurface safety valve

#54
20230146842
2023-05-11

Bi-directional wellhead annulus packoff with integral seal and hanger lockdown ring

#55
20230146814
2023-05-11

Debris resistant alignment system and method

#56
20230116845
2023-04-13

Lock mechanism for bit run tool and replaceable blades

#57
20230088389
2023-03-23

Wash tool

#58
20230066849
2023-03-02

Methods and apparatuses for gaining reentry below abandoned packers

#59
20230017192
2023-01-19

Expandable metal packing stacks

#60
20220412178
2022-12-29

Actively controlled bailer

#61
20220364436
2022-11-17

Universal wireless actuator for surface-controlled subsurface safety valve

#62
20220333453
2022-10-20

Downhole core plug apparatuses and related methods

#63
20220298877
2022-09-22

Coupling mechanism

#64
20220290505
2022-09-15

Transmission line retention sleeve for drill string components

#65
20220243546
2022-08-04

Releasable locking assembly, system, and method

#66
20220213739
2022-07-07

Drilling mechanism of coring drilling rig

#67
20220170334
2022-06-02

Apparatuses and methods for locating and shifting a downhole flow control member

#68
20220145715
2022-05-12

Pump down pipe severing tool

#69
20220098944
2022-03-31

Hydraulic landing nipple

#70
20220065100
2022-03-03

Smart wellhead

#71
20220065060
2022-03-03

Method and apparatus of smart landing nipple system

#72
20220049562
2022-02-17

Inward biased tubing hanger

#73
20220034196
2022-02-03

Snub friendly wellhead hanger

#74
20220003061
2022-01-06

Method and system for positioning a magnetic fluid conditioner

#75
20210404291
2021-12-30

Pump down intervention tool and assembly

#76
20210381324
2021-12-09

Tubular for downhole use, a downhole tubular system and method of forming a fluid passageway at a tubular for downhole use

#77
20210317716
2021-10-14

Lock mandrel with spring-loaded locking collar

#78
20210317715
2021-10-14

Self-orienting selective lockable assembly to regulate subsurface depth and positioning

#79
20210246753
2021-08-12

Fluid connection with lock and seal

#80
20210222511
2021-07-22

Method and apparatus for diverting load within a cut-to-release packer

#81
20210207443
2021-07-08

Centralizer for downhole probes

#82
20210189823
2021-06-24

Rotational Lock for Mating Wellhead Components

#83
20210172306
2021-06-10

Downhole tool with a releasable shroud at a downhole tip thereof

#84
20210172293
2021-06-10

HIGH-PRESSURE MULTILATERAL JUNCTION WITH MAINBORE AND LATERAL ACCESS AND CONTROL

#85
20210172292
2021-06-10

Multilateral junction with twisted mainbore and lateral bore legs

#86
20210172266
2021-06-10

Helical alignment sleeve

#87
20210172265
2021-06-10

Unitary lateral leg with three or more openings

#88
20210140278
2021-05-13

Mechanical barriers for downhole degradation and debris control

#89
20210131233
2021-05-06

Remotely operated isolation valve

#90
20210123328
2021-04-29

Intelligent landing profile

#91
20210102436
2021-04-08

Fluid connection assembly

#92
20210079765
2021-03-18

Systems and methods for opening screen joints

#93
20210079746
2021-03-18

Locking collar stop

#94
20210032946
2021-02-04

Liner hanger system

#95
20210025261
2021-01-28

Insert safety valve (variants)

#96
20210017826
2021-01-21

Tubing hanger running tool systems and methods

#97
20210010340
2021-01-14

One trip lockdown sleeve and running tool

#98
20200408053
2020-12-31

Latching apparatus and method

#99
20200392806
2020-12-17

Hanger running tool and hanger

#100
20200370386
2020-11-26

Rotating hanger system with ratchet mechanism

#101
20200292016
2020-09-17

Pumpjack lock

#102
20200270961
2020-08-27

Well tool device comprising a ratchet system

#103
20200248520
2020-08-06

Fishing tool with electric release

#104
20200232293
2020-07-23

Method and apparatus for preventing premature set of liner top packer

#105
20200224504
2020-07-16

Downhole Release Mechanism

#106
20200182046
2020-06-11

Subsea well equipment landing indicator and locking indicator

#107
20200182017
2020-06-11

Profile-selective sleeves for subsurface multi-stage valve actuation

#108
20200123864
2020-04-23

Fluid lock pin apparatus

#109
20200072010
2020-03-05

Fluid connection and seal

#110
20200063513
2020-02-27

Apparatuses and methods for locating and shifting a downhole flow control member

#111
20200040690
2020-02-06

Rotating control device having locking pins for locking a bearing assembly

#112
20200040689
2020-02-06

Rotating control device having a locking block system

#113
20200040688
2020-02-06

Rotating control device having an anti-rotation locking system

#114
20200024912
2020-01-23

Downhole location indication system

#115
20200011172
2020-01-09

Sensor nipple and port for downhole production tubing

#116
20200003044
2020-01-02

Tool for measuring corrosion in oil wells and method for measuring corrosion

#117
20200003019
2020-01-02

Liner hanger system

#118
20190390528
2019-12-26

Containment systems for sealing a pass-through in a well, and methods therefore

#119
20190390526
2019-12-26

Self-orienting selective lockable assembly to regulate subsurface depth and positioning

#120
20190360287
2019-11-28

Latch mechanism and system for downhole applications

#121
20190353006
2019-11-21

TOOLS AND METHODS FOR USE IN COMPLETION OF A WELLBORE

#122
20190352989
2019-11-21

System for acquisition of wellbore parameters and short distance data transfer

#123
20190323310
2019-10-24

Downhole positioning and anchoring device

#124
20190316441
2019-10-17

TOOLS AND METHODS FOR USE IN COMPLETION OF A WELLBORE

#125
20190301260
2019-10-03

REMOTELY OPERATED FLUID CONNECTION

#126
20190284898
2019-09-19

Tandem releasable bridge plug system and method for setting such tandem releasable plugs

#127
20190284888
2019-09-19

System for acquisition of wellbore parameters and short distance data transfer

#128
20190257177
2019-08-22

Systems and methods for opening screen joints

#129
20190249506
2019-08-15

Assembly and method for performing aligned operation with tool oriented in downhole tubular

#130
20190234175
2019-08-01

Treatment apparatus with flowback feature

#131
20190234174
2019-08-01

Treatment apparatus with movable seat for flowback

#132
20190234164
2019-08-01

Selective test tool

#133
20190226301
2019-07-25

Reverse circulation debris removal tool for setting isolation seal assembly

#134
20190203545
2019-07-04

Centralizer for downhole probes

#135
20190178077
2019-06-13

Subsea well equipment landing indicator and locking indicator

#136
20190178049
2019-06-13

Plug and plug and abandonment system

#137
20190169942
2019-06-06

Systems and methods for pipe concentricity, zonal isolation, and stuck pipe prevention

#138
20190153822
2019-05-23

Remotely operated isolation valve

#139
20190153813
2019-05-23

Profile-selective sleeves for subsurface multi-stage valve actuation

#140
20190128109
2019-05-02

Intelligent well system

#141
20190093459
2019-03-28

Inner and outer downhole structures having downlink activation

#142
20190085653
2019-03-21

Retrievable cement bushing system and methodology

#143
20190055791
2019-02-21

Subsea rotating control device apparatus having debris barrier

#144
20190048681
2019-02-14

Safety plug

#145
20190010772
2019-01-10

Adjustable and redressable collet

#146
20190003287
2019-01-03

Low load collet with multi-angle profile

#147
20180371848
2018-12-27

Centralizer for downhole probes

#148
20180371840
2018-12-27

Methods for drilling and producing a surface wellbore

#149
20180355688
2018-12-13

Actuation devices for well tools

#150
20180347303
2018-12-06

Side door hanger system for sealing a pass-through in a wellhead, and method therefore

#151
20180334870
2018-11-22

Dissolvable protector sleeve

#152
20180320469
2018-11-08

Tubing hanger orientation system and techniques

#153
20180313180
2018-11-01

FRICTION LOCK ASSEMBLY AND RETAINING RING FOR WELLHEAD

#154
20180283140
2018-10-04

Junction isolation tool for fracking of wells with multiple laterals

#155
20180274316
2018-09-27

SYSTEM AND METHOD FOR INTELLIGENT LATCH SECUREMENT

#156
20180274314
2018-09-27

Latch mechanism and system for downhole applications

#157
20180266191
2018-09-20

Collet device with an adjustable snap value

#158
20180258726
2018-09-13

Hanger running tool and hanger

#159
20180252060
2018-09-06

ROD LOCKING APPARATUS

#160
20180230764
2018-08-16

Tool positioning and latching system

#161
20180216430
2018-08-02

Deployment of downhole sensing devices

#162
20180209230
2018-07-26

Load shoulder system

#163
20180195356
2018-07-12

High flow downhole lock

#164
20180187532
2018-07-05

Retrievable pump systems for wells and methods of use

#165
20180187527
2018-07-05

METHOD AND SYSTEM FOR SWITCHING A FUNCTIONALITY OF A LINER EXPANSION TOOL

#166
20180187524
2018-07-05

Expansion cone with rotational lock

#167
20180179839
2018-06-28

Tubing hanger running tool systems and methods

#168
20180179832
2018-06-28

Expandable drillable shoe

#169
20180171734
2018-06-21

Apparatuses and methods for locating and shifting a downhole flow control member

#170
20180163494
2018-06-14

Installation and retrieval of pressure control device releasable assembly

#171
20180163493
2018-06-14

Installation and retrieval of pressure control device releasable assembly

#172
20180156000
2018-06-07

Positioning system

#173
20180155999
2018-06-07

Systems and methods for reducing bit damage in a landing tool

#174
20180135370
2018-05-17

Drillable latching plug

#175
20180135358
2018-05-17

Selective seal stem anchor

#176
20180112488
2018-04-26

Casing floatation system with latch-in-plugs

#177
20180106128
2018-04-19

Back pressure valve

#178
20180100368
2018-04-12

System and method for landing equipment with retractable shoulder assembly

#179
20180080289
2018-03-22

Universal downhole probe system

#180
20180073579
2018-03-15

Pumpjack lock

#181
20180073335
2018-03-15

Completion assembly

#182
20180066487
2018-03-08

Locking mandrel and running tool combination

#183
20180058162
2018-03-01

Passively motion compensated tubing hanger running tool assembly

#184
20180058156
2018-03-01

Method of running a passively motion compensated tubing hanger running tool assembly

#185
20180058155
2018-03-01

Passively motion compensated subsea well system

#186
20180045037
2018-02-15

Position indicator through acoustics

#187
20180045005
2018-02-15

Hydraulic disconnect tool

#188
20180038221
2018-02-08

Apparatus and method for locating and setting a tool in a profile

#189
20180038207
2018-02-08

Jet perforating and cutting method

#190
20180038172
2018-02-08

POLYMER-BASED CENTRALIZER FOR DOWNHOLE DRILLING APPARATUS

#191
20180023365
2018-01-25

Positive locating feature of OptiPort

#192
20170362907
2017-12-21

System and method to install velocity string

#193
20170328168
2017-11-16

Releasable ratchet device

#194
20170321514
2017-11-09

Wellbore isolation method for sequential treatment of zone sections with and without milling

#195
20170321513
2017-11-09

Tubular recess or support mounted isolation support for an object for formation pressure treatment

#196
20170314364
2017-11-02

TOOLS AND METHODS FOR USE IN COMPLETION OF A WELLBORE

#197
20170268299
2017-09-21

Stabilizer assembly

#198
20170247966
2017-08-31

Damaged seal bore repair device

#199
20170247964
2017-08-31

Latchable casing while drilling systems and methods

#200
20170234105
2017-08-17

Downhole valve system

#201
20170226837
2017-08-10

Downhole device and downhole system

#202
20170198561
2017-07-13

Apparatus and method for perforating a wellbore casing, and method and apparatus for fracturing a formation

#203
20170183929
2017-06-29

Apparatuses and methods for locating within a wellbore

#204
20170175469
2017-06-22

Downhole service tool employing a tool body with a latching profile and a shifting key with multiple profiles

#205
20170167218
2017-06-15

Rotating hanger and running tool

#206
20170089162
2017-03-30

External locking mechanism for seal energizing ring

#207
20170081927
2017-03-23

Relockable shearing swivel tool apparatus and method

#208
20170044862
2017-02-16

Retrievable cement bushing system and methodology

#209
20170044861
2017-02-16

Wellhead port plug assembly

#210
20170037692
2017-02-09

Setting a downhole tool in a wellbore

#211
20170022785
2017-01-26

Safety device for a fluid production well, associated installation and method

#212
20170016284
2017-01-19

Centralizer for downhole probes

#213
20170009533
2017-01-12

Connection apparatus

#214
20170002619
2017-01-05

Method and device for activating and deactivating a GS-tool

#215
20160369582
2016-12-22

Expandable ball seat for use in fracturing geologic formations

#216
20160356150
2016-12-08

System for acquisition of wellbore parameters and short distance data transfer

#217
20160356109
2016-12-08

Well system with settable shoulder

#218
20160348474
2016-12-01

Resistor actuator release system and methodology

#219
20160348453
2016-12-01

Tool positioning and latching system

#220
20160340992
2016-11-24

System and methodology for coupling tubing

#221
20160340991
2016-11-24

Method and system for positioning a magnetic fluid conditioner

#222
20160326835
2016-11-10

Wellbore stimulation tool, assembly and method

#223
20160326825
2016-11-10

Systems and methods to reduce break-out torque

#224
20160298442
2016-10-13

Instrument line for insertion in a drill string of a drilling system

#225
20160298404
2016-10-13

Positive locating feature of optiport

#226
20160281457
2016-09-29

Test packer and method for use

#227
20160273349
2016-09-22

Position indicator through acoustics

#228
20160273302
2016-09-22

Back pressure valve

#229
20160273290
2016-09-22

Downhole latch assembly

#230
20160273288
2016-09-22

Expandable latch coupling assembly

#231
20160265294
2016-09-15

Downhole positioning and anchoring device

#232
20160245029
2016-08-25

COMPOUND BEAM MECHANICAL CASING COLLAR LOCATOR

#233
20160237805
2016-08-18

Methods and systems for orienting a tool in a wellbore

#234
20160230486
2016-08-11

Latching assembly

#235
20160208581
2016-07-21

Sleeve shifting tool

#236
20160201428
2016-07-14

Non-rotating connector for wellbore cementing tool

#237
20160194935
2016-07-07

Adjustable choke device for a production tube

#238
20160168947
2016-06-16

Packer plug with retractable latch, downhole system, and method of retracting packer plug from packer

#239
20160160590
2016-06-09

Single action, dual position, weight-down locating assembly

#240
20160138368
2016-05-19

Device for ensuring continuous circulation in well drilling

#241
20160138366
2016-05-19

Method and apparatus for selective injection

#242
20160108690
2016-04-21

Downhole apparatus and method of use

#243
20160102512
2016-04-14

Dual lock system

#244
20160090818
2016-03-31

Remotely operated isolation valve

#245
20160090803
2016-03-31

Hydraulic locator

#246
20160090802
2016-03-31

Load shoulder system

#247
20160084028
2016-03-24

FRACTURING PORT LOCATOR AND ISOLATION TOOL

#248
20160084027
2016-03-24

Downhole system having selective locking apparatus and method

#249
20160084009
2016-03-24

In situ pump for downhole applications

#250
20160032670
2016-02-04

Shifting tool

#251
20160010429
2016-01-14

Tools and methods for use in completion of a wellbore

#252
20160003003
2016-01-07

Tools and methods for use in completion of a wellbore

#253
20150376986
2015-12-31

Fusible, resettable lock open device

#254
20150376977
2015-12-31

Non-rotating method and system for isolating wellhead pressure

#255
20150369012
2015-12-24

Apparatus and methodology for continuous down hole sand screen fill removal

#256
20150361732
2015-12-17

INDEXABLE TUBING STABILIZER AND PROTECTOR

#257
20150354350
2015-12-10

Downhole vibratory communication system and method

#258
20150345242
2015-12-03

Hanger running tool

#259
20150322731
2015-11-12

Centralizer for downhole probes

#260
20150308225
2015-10-29

Selectively operated two way check valve for subterranean use

#261
20150300099
2015-10-22

Universal downhole probe system

#262
20150285018
2015-10-08

Casing hanger lockdown tools

#263
20150275620
2015-10-01

Semi-autonomous insert valve for well system

#264
20150275603
2015-10-01

Head assembly

#265
20150259999
2015-09-17

Selective orientation and location system

#266
20150259995
2015-09-17

Alignment assembly

#267
20150252628
2015-09-10

Wellbore strings containing expansion tools

#268
20150226034
2015-08-13

Apparatus and method for perforating a wellbore casing, and method and apparatus for fracturing a formation

#269
20150211318
2015-07-30

Signal operated drilling tools for milling, drilling, and/or fishing operations

#270
20150184476
2015-07-02

Tool positioning and latching system

#271
20150176369
2015-06-25

Autonomous selective shifting tool

#272
20150159449
2015-06-11

Downhole tool

#273
20150136407
2015-05-21

Rotating control device docking station

#274
20150129240
2015-05-14

Completion systems including an expansion joint and a wet connect

#275
20150114723
2015-04-30

Diamond core drill wire line latch assembly

#276
20150101830
2015-04-16

Lock ring and packoff for wellhead

#277
20150101801
2015-04-16

System and method for sealing a wellbore

#278
20150101791
2015-04-16

Method and apparatus for installing and removing an electric submersible pump

#279
20150075815
2015-03-19

Apparatus and methods setting a string at particular locations in a wellbore for performing a wellbore operation

#280
20150075793
2015-03-19

Apparatus and method for jet perforating and cutting tool

#281
20150075788
2015-03-19

Apparatus and methods for locating a particular location in a wellbore for performing a wellbore operation

#282
20150068737
2015-03-12

Logging tool and method of use

#283
20150053408
2015-02-26

Method and system for operating a downhole tool, for fracturing a formation and/or for completing a wellbore

#284
20150053395
2015-02-26

Seal element

#285
20150042487
2015-02-12

Latching assembly for wellbore logging tools and method of use

#286
20150027731
2015-01-29

Back pressure valve

#287
20150013971
2015-01-15

Test packer and method for use

#288
20140352944
2014-12-04

Packoff for liner deployment assembly

#289
20140345852
2014-11-27

Landing collar

#290
20140332234
2014-11-13

Setting tool

#291
20140305648
2014-10-16

Tools and methods for use in completion of a wellbore

#292
20140284064
2014-09-25

Wet connection system for downhole equipment

#293
20140262331
2014-09-18

Plug and perforate using casing profiles

#294
20140238698
2014-08-28

Method for deploying subsurface safety valve having integral pack off

#295
20140209306
2014-07-31

Wellbore treatment tool and method

#296
20140202708
2014-07-24

Downhole component having dissolvable components

#297
20140174761
2014-06-26

Downhole shifting tool

#298
20140166315
2014-06-19

Lock assembly with cageless dogs

#299
20140166314
2014-06-19

High pressure lock assembly

#300
20140166312
2014-06-19

Multi-position weight down locating tool