SU684132A1

SU684132A1 - Method of removing filters from wells

Info

Publication number: SU684132A1
Application number: SU782626041A
Authority: SU
Inventors: Александр Федорович Мосев; Иван Андреевич Сергиенко
Original assignee: Московский Ордена Трудового Красного Знамени Геологоразведочный Институт Им. С.Орджоникидзе
Priority date: 1978-06-09
Filing date: 1978-06-09
Publication date: 1979-09-05

Description

(54) СПОСОБ ИЗВЛЕЧЕНИЯ ФИЛЬТРОВ ИЗ СКВАЖИН(54) METHOD OF EXTRACTING FILTERS FROM WELLS

Изобретение относитс к буровой технике и может быть использовано при замене фильтровых колонн вод ных и технологических скважин подземного выщелачивани .The invention relates to a drilling technique and can be used when replacing filter columns of water and process wells of an underground leach.

Известен способ извлечени труб и фильтров из скважин, включающий подъем их гидродомкратами с лебедкой и одновременную подачу раствора под давлением в полость поднимаемой колонны труб 1.There is a known method for extracting pipes and filters from wells, including lifting them with hydraulic jacks with a winch and simultaneously supplying the solution under pressure into the cavity of the lifting string of pipes 1.

Недостатком известного способа вл етс то, что при подъеме фильтров из-за плотного бокового.обжати фильтра породой затрачиваютс большие усили . Дл этого требуютс т говые средства большой грузоподъемности (лебедки, дс краты и т. п.), что повышает стоимость работ при извлечении фильтров и зачастую приводит к их повреждени м.The disadvantage of this method is that when lifting the filters due to the dense lateral compression of the filter, large forces are expended. This requires heavy-duty traction facilities (winches, ds crates, etc.), which increases the cost of work when extracting filters and often leads to damage to them.

Наиболее близким к описываемому изобретению по технической сущности вл етс способ извлечени фильтров из скважин путем подъема их с применением т говых средств (лебедок, буровых станков, домкратов) и одновременным воздействием на них вибрационнь 1х нагрузок 2J.The closest to the described invention to the technical essence is a method of extracting filters from wells by lifting them with the use of traction means (winches, drilling rigs, jacks) and the simultaneous action on them of vibration 1x loads 2J.

Недостаток способа заключаетс в том, что при воздействии вибрации на фильтровую колонну обжимающий ее грунт находитс на месте с некоторым перераспределением частиц грунта, однако усилие обжати от бокового давлени остаетс неизменным. При этом недостаточно снижаютс усили подъема фильтра из скважин.The disadvantage of the method lies in the fact that when a filter is subjected to vibration on the filter column, the soil is compressed in place with a certain redistribution of soil particles, however, the lateral pressure reduction force remains unchanged. At the same time, the filter lifting forces are not sufficiently reduced.

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Цель изобретени - снижение усилий , затрачиваемых при извлечении фильтров.The purpose of the invention is to reduce the effort involved in removing the filters.

Поставленна цель достигаетс тем, что перед подъемом под фильтром The goal is achieved by the fact that before climbing under the filter

5 образуют полость.5 form a cavity.

Способ заключаетс в следующемThe method is as follows.

Claims

Before removing the filter string, the drill string is lowered into it, drill its shoe and form a cavity under the filter. The cavity is formed by drilling a certain interval of the well below the filter. To improve the shear behind the filter, the drilled interval widened 5 to a diameter greater than the diameter of the filter. Then, using a lifting device, such as a winch of a drilling machine, while simultaneously transmitting vibration loads to the column, begin lifting the filter. Under the action of vibration loads on the filter, the rock adjacent to its lateral surface is crumbling into the cavity formed under the filter, which promotes the release of the filter column from the soil. My side pressure on the column at the same time decreases sharply, which also leads to a decrease in filter lifting forces. Example. A filter with a diameter of 100 mm and a length of 10 m must be removed from the well. Depth of installation of the filter is 180 m. Breeds of the productive horizon - fine-grained sands. Before removing the filter, a drill shell of 76 mm with a reamer up to a diameter of 115 mm is lowered into it and the well is recessed up to 181 m. Then, drill pipes are connected to the filter and connected to the machine winch. Using vibrara, located at the wellhead, create shock loads on the drill string. When striking a filter, vibratory forces are transmitted, while compressing its soil falls on the cavity under the filter. As the lift accelerates, the shock (vibration) loads cease. Claims The method of extracting filters from wells by lifting them with the use of traction means and simultaneously exposing them to vibration loads, characterized in that, in order to reduce the effort expended in removing the filters, they form a cavity before lifting under the filter. Sources of information taken into account in the examination 1. The author's certificate of the USSR W 599042, cl. E 21 at 23/00, 1977.

2. Anatolievsky P, A. and others. Design and construction of wells for water supply. M., Stroyizdat, 1970, p. 185-186.