SU909114A1 - Method of repairing casings - Google Patents
Method of repairing casings Download PDFInfo
- Publication number
- SU909114A1 SU909114A1 SU792773784A SU2773784A SU909114A1 SU 909114 A1 SU909114 A1 SU 909114A1 SU 792773784 A SU792773784 A SU 792773784A SU 2773784 A SU2773784 A SU 2773784A SU 909114 A1 SU909114 A1 SU 909114A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- casing
- patch
- damage
- interval
- radial loads
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 14
- 239000011505 plaster Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Description
(S) СПОСОБ РЕМОНТА ОБСАДНЫХ КОЛОНН(S) METHOD OF REPAIR OF COLUMN COLUMNS
1one
Изобретение относитс к технологии ремонта обсадных колонн и может быть использовано в нефт ной и газовой промышленности при ремонте оПсадных колонн методом установки расшир емых заготовок пластырей на ремонтируемом участке обсадной колонны.The invention relates to casing repair technology and can be used in the oil and gas industry in repairing casing strings by installing expandable pre-fabrication patches in the repaired section of the casing.
Известны методы ремонта обсадных колонн методом цементировани , спуска обсадной колонны меньшего диаметра с последукм-чим ее цементированием П.Casing repair methods are known using the method of cementing, lowering a casing string of smaller diameter followed by its cementing P.
Однако эти способы дорогосто щие и трудоемкие. Цементирование приносит успех только в 40 и недолговечно,а спуск обсадной колонны меньшего диаметра снижает дебит и затрудн ет последующие работы по ремонту.However, these methods are expensive and time consuming. Cementing brings success only in 40 and short-lived, and the launch of a smaller diameter casing reduces the flow rate and complicates subsequent repair work.
Известен способ ремонта обсадных колонн, включающий спуск в скважину пластыр длиной, большей интервала повреждени обсадной колонны, его расширение и прижатие к обсадной колонне путем создани радиальных нагрузок . Дл обеспечени полной герметич ности ремонтируемого участка на наружную поверхность заготовки пЛастыр перед спуском наноситс уплотн ющий слой.There is a known method for repairing casing strings, including the release into the well of a patch of a length longer than the damage interval of the casing, its expansion and pressing against the casing by creating radial loads. In order to ensure complete tightness of the repaired area, a sealing layer is applied to the outer surface of the workpiece.
Технологи работы по указанному способу заключаетс в следующем.The technology for this method is as follows.
Заготовка пластыр устанавливаетс на устройство дл ее расширет и спускаетс в скважину в заданный интервал , В процессе спуска расширитель A blank patch is installed on the device to expand it and descend into the well at a predetermined interval. During the descent process, the expander
10. имеет диаметр, соответствующий свободному прохох дению его в колонне (.транспортный). По достижении заданной глубины расширитель раздвигают до такого диаметра, чтобы в процессе т гивани его через заготовку пластыр создать радиальные нагрузки, необходимые дл расширени заготовки пластыр до создани напр женного состо ни пластыр с колонной. Рас1иири20 тель прот гиваетс с посто нными радиальными нагрузками мерез заготовку пластыр , котора , прин в круглую фоформу и получив напр женное состо ние10. has a diameter corresponding to its free breathing in the column (.transport). Upon reaching a predetermined depth, the expander is pushed up to such a diameter that, in the process of pulling it through the workpiece patch, create the radial loads necessary to expand the workpiece patch to create a stress state of the patch with a column. The rider extends with constant radial loads through a pre-fabricated patch, which, having taken a circular shape and having received a stress state
39093909
в обсадной трубе, превращаетсл в пластырь . Затем устройство с расширителем поднимаетс из скважины 2.in the casing, turns into a plaster. The expander device then rises from well 2.
Недостатком способа вл етс создание напр женного состо ни пластыр с колонной по всей его длине, что в случае повреждений в виде щелевой перфорации, трещин, износа и коррозии приводит к дополнительным повреждени м обсадной колонны или к увеличению старых (фиг. 1).The disadvantage of this method is the creation of a stressed state of a patch with a column along its entire length, which, in the case of damage in the form of perforations, cracks, wear and corrosion, leads to additional damage to the casing or to an increase in the old ones (Fig. 1).
Цель изобретени - уменьшение напр жений , возникающих в теле обсадной трубы в интервале повреждени .The purpose of the invention is to reduce the stresses arising in the casing body in the damage interval.
Указанна цель достигаетс тем, что на пластырь выше и. ниже интервала повреждени обсадной колонны создают радиальные нагрузки большие, чем радиальные нагрузки на пластырь, соответствующие интервалу повреждени обсадной колонны.This goal is achieved by having a patch above and. below the casing damage interval, the radial loads are larger than the radial loads on the patch corresponding to the casing damage interval.
Способ реализуетс следующим образом .The method is implemented as follows.
Спускаетс заготовка пластыр длиной , большей интервала повреждени , с устройством дл ее расширени в заданный интервал обсадной колонны таким образом, чтобы середина заготовки пластыр приходилась против середины интервала повреждени . В устройстве создаетс давление дл привода расширител , необходимое дл создани радиальных усилий с целью получени напр женной системы пластырь-колонна . Прот гивают расширитель через заготовку пластыр , не дот гива его до начала интервала повреждени . Сбрасывают давление в расширителе с целью уменьшени радиальных усилий, передаваемых пластырем на обсадную трубу .A blank of a patch longer than the damage interval is lowered with a device for extending it into a predetermined interval of the casing so that the center of the blank patch falls against the middle of the damage interval. The device is pressurized to drive the spreader, which is required to generate radial forces in order to obtain a stressful patch-string system. Pull the spreader through the workpiece patch, not dosing it before the start of the damage interval. Relieve the pressure in the expander in order to reduce the radial forces transmitted by the patch to the casing.
Расширитель без давлени прот гивают через заготовку пластыр на длину, несколько большую интервала повреждени , с целью обеспечени проходимоети колонны, но без напр женного состо ни на этом участке.The expander without pressure is pulled through the blank by a patch for a length slightly longer than the damage interval, in order to ensure the passage of the column, but without a stress state in this area.
Вновь создают давление в расширителе , необходимое дл создани ради|4Again, the pressure in the expander is necessary to create for the sake of | 4
альных усилий, с целью полумени напр женной системы пластырь-колонна и прот гивают расширитель через осталной участок заготовки пластыр . При необходимости дожать пластырь к колонне следующими проходами расширител проход т интервал повреждени без давлени . Усили , передаваемые расширителем по длине пластыр , по известному способу можно изобразить графиком , показанным на фиг. 2, а по предлагаемому - на фиг. 3. На графике Sрадиальные усили пластыр , передаваемые на обсадную колонну; L, - длина участка обсадной колонны, где устанавливаетс пластырь; зоны I - неповрежденный участок, зоны II - участок с повреждением.for the purpose of a half-body tensioned band-column system and pulling the expander through the rest of the workpiece patch. If necessary, press the plaster to the column with the next passages of the expander to pass a damage interval without pressure. The forces transmitted by the expander along the length of the plaster can be represented by a known method by the graph shown in FIG. 2, and as proposed in FIG. 3. On the graph there are radial forces of the patch transmitted to the casing; L, is the length of the casing section where the patch is applied; Zone I - an intact area, Zone II - a damaged area.
йормула изобретени formula of invention
Способ ремонта обсадных колонн, включающий спуск в скважину пластыр длиной, большей интервала повреждени обсадной колонны, его расширение и прижатие к обсадной колонне путем создани радиальных нагрузок, о тли чающийс тем, что, с целью уменьшени напр жений, возникающих в теле обсадной колонны в интервале повре):{дени , на пластырь выше и ниже интервала повреждени обсадной колонны создают радиальные нагрузки большие, чем радиальные нагрузки на пластырь, соответствующие интервалу повреждени обсадной колонны.A method for repairing casing strings, including the release into the well of a patch of length longer than the damage interval of the casing string, its expansion and pressing against the casing string by creating radial loads, which are based on the fact that, in order to reduce the stresses arising in the casing body in the interval damage): {for the patch above and below the damage interval of the casing create radial loads greater than the radial loads on the patch corresponding to the damage interval of the casing.
Источники информации, прин тые во внимание при, экспертизеSources of information taken into account during the examination
1.Сидоров И.Л. Восстановление герметичности обсадных колонн в нефт ных и газовых скважинах. Тематические научно-технические обзоры. Сер. Бурение , М., ВНИИОЭНГ, 1972, с. 78-891.Sidorov I.L. Restoration of casing tightness in oil and gas wells. Thematic scientific and technical reviews. Ser. Drilling, M., VNIIOENG, 1972, p. 78-89
2.Качественный ремонт вкладыша. Journal of Petroleum Technology. 1962, V. U, r 17., (прототип).2. High-quality repair liner. Journal of Petroleum Technology. 1962, V. U, r 17., (prototype).
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Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU792773784A SU909114A1 (en) | 1979-05-31 | 1979-05-31 | Method of repairing casings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU792773784A SU909114A1 (en) | 1979-05-31 | 1979-05-31 | Method of repairing casings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU909114A1 true SU909114A1 (en) | 1982-02-28 |
Family
ID=20830955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU792773784A SU909114A1 (en) | 1979-05-31 | 1979-05-31 | Method of repairing casings |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU909114A1 (en) |
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