External releasable overshot (ERO)

The external releasing overshot is designed to grip and retrieve tubing strings by engaging their external cylindrical surface during fishing operations in oil, gas, and geological exploration wells. Design features The external releasing overshot is designed to grip and retrieve tubing strings by engaging their external cylindrical surface during fishing operations in oil, gas, and geological exploration wells. The releasable overshot consists of a body, a sub, a bowl and a set of replaceable grapples (collet-type and spiral-type) to grip fish of various diameters. The collet-type overshot is used to retrieve fish with smaller diameters. The spiral-type overshot is used to retrieve fish with an OD approximately equal to the overshot OD. The fishing process is achieved by tapered spiral surfaces on the internal bore of the overshot body, which engage with the external surface of the spiral-type or collet-type grapple. To seal the connection between the overshot and the fish, cup packers can be installed as needed: – type A for use with spiral-type grapples; – type R for use with collet-type grapples. The sizes of the milling guide and packers must match the size of the selected grapple. The primary difference between the ERO and EROt overshots is the higher load capacity of the EROt. Overshots can be equipped with the following optional components: - extenders, installed between the body and the overshot sub, to enable retrieval of the fish significantly lower than the upper face; - oversized bowls, used during fishing operations in wells or drill strings whose internal diameter is substantially larger than the overshot OD; - milling guides for collet-type grapples, featuring case-hardened and tempered cutting teeth; - stop rings for drill pipe recovery by engaging the coupling or tool joint.

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Characteristics:

Designation	OD, mm	Max. size of spiral-type grapple, mm	Max. size of collet-type grapple, mm	Acceptable axial load, kN	Connection*
ERO-82	82.0	65.9	54	490	Z-44 (NC-16)
ERO-83	82.6	60.3	47.6	520	Z-44 (NC-16)
ERO-86	85.7	63.5	50.8	520	Z-44 (NC-16)
EROt-89	88.9	60.3	47.6	800	Z-44 (NC-16)
ERO-90	90.6	73.0	60.3	600	Z-44 (NC-16)
EROt-90	90.6	69.9	60.3	800	Z-44 (NC-16)
EROt-92	92.1	63.5	50.8	800	Z-44 (NC-16)
ERO-95	95.3	76.2	65.9	600	Z-44 (NC-16)
EROt-95	95.3	73.0	60.3	800	Z-44 (NC-16)
ERO-98	98.4	79.4	66.7	690	Z-65 (NC-23)
ERO-100	100.0	77.8	65.9	930	Z-65 (NC-23)
ERO-102	101.6	79.4	66.7	950	Z-65 (NC-23)
EROt-102	101.6	73.0	60.3	1600	Z-65 (NC-23)
ERO-104	104.0	76.2	65.9	1300	Z-65 (NC-23)
ERO-105	104.8	82.6	69.9	950	Z-65 (NC-23)
EROt-105	104.8	79.4	66.7	1380	Z-65 (NC-23)
ERO-108	108.0	85.7	73.0	960	Z-65 (NC-23)
EROt-108	108.0	79.4	66.7	1600	Z-65 (NC-23)
ERO-111	111.1	88.9	73.0	950	Z-73 (NC-26)
EROt-111	111.1	85.7	73.0	1380	Z-73 (NC-26)
ERO-112	112.0	88.9	81.8	950	Z-73 (NC-26)
EROt-112	112.0	85.7	73.0	1400	Z-73 (NC-26)
ERO-114	114.3	92.9	82.6	830	Z-76 (2 7/8 Reg)
EROt-114	114.3	85.7	73.0	1600	Z-76 (2 7/8 Reg)
ERO-116	115.9	95.2	85.7	750	Z-76 (2 7/8 Reg)
EROt-116	115.9	92.1	81.8	1100	Z-76 (2 7/8 Reg)
ERO-118	117.5	95.2	85.7	910	Z-76 (2 7/8 Reg)
EROt-118	117.5	88.9	79.4	1220	Z-76 (2 7/8 Reg)
ERO-119	119.1	96.8	85.7	910	Z-76 (2 7/8 Reg)
EROt-119	119.1	92.9	82.6	1450	Z-76 (2 7/8 Reg)
ERO-120	119.6	95.2	84.1	1030	Z-76 (2 7/8 Reg)
ERO-121	120.7	98.4	85.7	960	Z-76 (2 7/8 Reg)
EROt-121	120.7	87.3	74.6	2000	Z-76 (2 7/8 Reg)
ERO-122	122.2	98.4	88.9	970	Z-76 (2 7/8 Reg)
EROt-122	122.2	92.9	82.6	1670	Z-76 (2 7/8 Reg)
ERO-124	123.8	101.6	92.1	900	Z-76 (2 7/8 Reg)
EROt-124	123.8	95.2	85.7	1600	Z-76 (2 7/8 Reg)
EROo-124	124.1	104.8	92.1	610	Z-76 (2 7/8 Reg)
EROs-124	124.4	103.3	88.9	650	Z-76 (2 7/8 Reg)
ERO-127	127.0	104.8	92.1	950	Z-76 (2 7/8 Reg)
EROt-127	127.0	95.2	79.4	2000	Z-76 (2 7/8 Reg)
ERO-130	130.2	109.5	98.4	830	Z-86 (NC-31)
EROt-130	130.2	101.6	92.9	1600	Z-86 (NC-31)
ERO-132	131.8	109.5	93.7	960	Z-86 (NC-31)
EROt-132	131.8	98.4	82.6	2190	Z-86 (NC-31)
ERO-135	134.9	112.7	96.8	950	Z-86 (NC-31)
EROt-135	134.9	101.6	85.7	2180	Z-86 (NC-31)
ERO-136	136.5	114.3	98.4	970	Z-86 (NC-31)
EROt-136	136.5	103.2	87.3	2220	Z-86 (NC-31)
ERO-138	138.1	115.9	100	670	Z-86 (NC-31)
EROt-138	138.1	104.8	88.9	2220	Z-86 (NC-31)
ERO-140	139.7	117.5	101.6	1190	Z-86 (NC-31)
EROt-140	139.7	111.1	95.2	1660	Z-86 (NC-31)
ERO-143	142.9	120.7	108.0	1270	Z-102 (NC-38)
EROt-143	142.9	117.5	104.8	1390	Z-102 (NC-38)
ERO-146	146.1	122.2	110.3	1300	Z-102 (NC-38)
EROt-146	146.1	117.5	98.4	1630	Z-102 (NC-38)
ERO-148	147.6	123.8	108.0	1470	Z-102 (NC-38)
EROt-148	147.6	114.3	98.4	2220	Z-102 (NC-38)
ERO-149	149.2	127.0	114.3	1240	Z-102 (NC-38)
EROt-149	149.2	120.7	108.0	1720	Z-102 (NC-38)
ERO-151	150.8	127.0	114.3	1470	Z-102 (NC-38)
EROt-151	150.8	117.5	101.6	2220	Z-102 (NC-38)
ERO-152	152.4	130.2	114.3	1260	Z-102 (NC-38)
EROt-152	152.4	123.8	108.0	1480	Z-102 (NC-38)
ERO-154	154.0	130.2	114.3	1470	Z-102 (NC-38)
EROt-154	154.0	120.7	104.8	2220	Z-102 (NC-38)
ERO-155	155.6	130.2	114.3	1670	Z-102 (NC-38)
EROt-155	155.6	123.8	108.0	2060	Z-102 (NC-38)
ERO-156	156.2	130.2	114.3	1100	Z-102 (NC-38)
EROt-156	156.2	122.2	104.8	1500	Z-102 (NC-38)
ERO-157	157.2	130.2	114.3	1870	Z-102 (NC-38)
EROt-157	157.2	123.8	108.0	2230	Z-102 (NC-38)
ERO-162	161.9	133.4	117.5	2060	Z-102 (NC-38)
EROt-162	161.9	123.8	108.0	2500	Z-102 (NC-38)
ERO-165	165.1	142.9	127.0	1600	Z-117 (4 1/2 Reg)
EROt-165	165.1	133.4	117.5	2460	Z-117 (4 1/2 Reg)
ERO-168	168.3	141.3	125.4	1860	Z-117 (4 1/2 Reg)
EROt-168	168.3	130.2	111.1	2720	Z-117 (4 1/2 Reg)
ERO-170	169.9	141.3	122.2	2070	Z-117 (4 1/2 Reg)
EROt-170	169.9	130.2	108.0	2890	Z-117 (4 1/2 Reg)
ERO-175	174.6	146.1	127.0	2450	Z-122 (NC-46)
EROt-175	174.6	136.5	117.5	3170	Z-122 (NC-46)
ERO-176	176.2	149.2	127.0	1910	Z-122 (NC-46)
EROt-176	176.2	141.3	122.2	2860	Z-122 (NC-46)
ERO-181	181.0	152.4	136.5	2150	Z-122 (NC-46)
EROt-181	181.0	139.7	120.7	3670	Z-122 (NC-46)
ERO-184	184.2	155.6	139.7	2150	Z-133 (NC-50)
EROt-184	184.2	141.3	122.2	3870	Z-133 (NC-50)
ERO-188	187.3	158.8	141.3	2110	Z-133 (NC-50)
EROt-188	187.3	146.1	127.0	3620	Z-133 (NC-50)
ERO-190	190.5	161.9	146.1	2080	Z-133 (NC-50)
EROt-190	190.5	152.4	133.4	3260	Z-133 (NC-50)
ERO-194	193.7	165.1	149.2	2100	Z-133 (NC-50)
EROt-194	193.7	152.4	133.4	3800	Z-133 (NC-50)
ERO-197	196.9	168.3	152.4	2080	Z-133 (NC-50)
EROt-197	196.9	155.6	136.5	3670	Z-133 (NC-50)
ERO-200	200.0	171.4	155.6	2070	Z-133 (NC-50)
EROt-200	200.0	158.8	141.3	4120	Z-133 (NC-50)
ERO-203	203.2	174.6	158.8	2150	Z-133 (NC-50)
EROt-203	203.2	161.9	146.1	4130	Z-133 (NC-50)
ERO-206	206.4	177.8	162.7	2100	Z-133 (NC-50)
EROt-206	206.4	165.1	146.1	4200	Z-133 (NC-50)
ERO-210	209.6	181.0	161.9	2150	Z-147 (5 1/2 FH)
EROt-210	209.6	168.3	149.2	4130	Z-147 (5 1/2 FH)
ERO-213	212.7	184.2	168.3	2140	Z-147 (5 1/2 FH)
ERO-213	212.7	171.4	152.4	4130	Z-147 (5 1/2 FH)
ERO-216	215.9	187.3	171.4	2150	Z-147 (5 1/2 FH)
EROt-216	215.9	174.6	156.4	4130	Z-147 (5 1/2 FH)
ERO-219	219.1	190.5	174.6	1920	Z-147 (5 1/2 FH)
EROt-219	219.1	177.8	158.8	4130	Z-147 (5 1/2 FH)
ERO-220	219.6	190.5	174.6	2000	Z-147 (5 1/2 FH)
EROt-220	219.6	177.8	158.8	4210	Z-147 (5 1/2 FH)
ERO-222	222.3	193.7	177.8	2150	Z-147 (5 1/2 FH)
EROt-222	222.3	181.0	161.9	4130	Z-147 (5 1/2 FH)
ERO-225	225.4	196.0	181.0	2140	Z-147 (5 1/2 FH)
EROt-225	225.4	184.2	165.1	4120	Z-147 (5 1/2 FH)
ERO-228	228.6	200.0	184.2	2150	Z-152 (6 5/8 Reg)
EROt-228	228.6	187.3	168.3	4130	Z-152 (6 5/8 Reg)
ERO-232	231.8	203.2	184.2	2090	Z-152 (6 5/8 Reg)
EROt-232	231.8	190.5	171.4	4130	Z-152 (6 5/8 Reg)
ERO-235	235.0	206.4	190.5	2150	Z-152 (6 5/8 Reg)
EROt-235	235.0	193.7	174.6	4130	Z-152 (6 5/8 Reg)
ERO-238	238.1	209.6	193.7	2140	Z-152 (6 5/8 Reg)
EROt-238	238.1	196.9	177.8	4120	Z-152 (6 5/8 Reg)
ERO-241	241.3	212.7	196.9	2150	Z-171 (6 5/8 Reg)
EROt-241	241.3	200.0	181.0	4130	Z-171 (6 5/8 Reg)
ERO-245	244.5	215.9	200.0	2150	Z-171 (6 5/8 Reg)
EROt-245	244.5	203.2	184.2	4130	Z-171 (6 5/8 Reg)
ERO-256	255.6	219.1	203.2	3400	Z-171 (6 5/8 Reg)
EROt-256	255.6	212.7	193.7	4380	Z-171 (6 5/8 Reg)
ERO-257	257.2	222.3	206.4	3150	Z-171 (6 5/8 Reg)
EROt-257	257.2	215.9	196.9	4130	Z-171 (6 5/8 Reg)
ERO-260	260.4	219.1	200.0	4160	Z-171 (6 5/8 Reg)
EROt-260	260.4	215.9	196.9	4630	Z-171 (6 5/8 Reg)
EROt-267	266.7	225.4	206.4	4120	Z-171 (6 5/8 Reg)
EROt-270	269.9	228.6	212.7	4130	Z-177 (7 5/8 Reg)
EROt-280	279.4	219.1	193.7	7090	Z-177 (7 5/8 Reg)
EROt-283	282.6	242.0	222.3	4020	Z-177 (7 5/8 Reg)
EROt-286	285.8	244.5	225.4	4130	Z-177 (7 5/8 Reg)
EROt-289	288.9	228.6	203.2	7090	Z-177 (7 5/8 Reg)
EROt-298	298.5	257.2	238.1	4220	Z-177 (7 5/8 Reg)
EROt-302	301.6	254.0	235.0	5110	Z-177 (7 5/8 Reg)
EROt-324	323.9	285.8	266.7	3630	Z-177 (7 5/8 Reg)
EROt-350	349.3	304.8	285.7	4630	Z-177 (7 5/8 Reg)
EROt-406	406.4	355.6	336.6	6700	Z-177 (7 5/8 Reg)
EROt-425	425.5	374.7	355.6	6700	Z-177 (7 5/8 Reg)