SU817203A2

SU817203A2 - Arrangement for effecting reverse circulation in well

Info

Publication number: SU817203A2
Application number: SU782640521A
Authority: SU
Inventors: Леонид Григорьевич Шолохов; Виктор Иванович Еркалов; Виктор Алексеевич Клипов
Original assignee: Свердловский Ордена Трудового Красно-Го Знамени Горный Институт Им.B.B.Bax-Рушева
Priority date: 1978-07-10
Filing date: 1978-07-10
Publication date: 1981-03-30

Description

Изобретение относитс к горному делу, предназначенному дл бурени разведочных скважин.The invention relates to mining intended for the drilling of exploration wells.

По основному авт. св. № 623954 известно устройство, включающее переходник , сопло, сообщающеес с диффузором , и корпус с центральным каналом дл обратного потока. При этом сопло выполнено кольцевым, а диффузор образован наружной поверхностью корпуса, выполненной конусообразной , и стенками скважины, причем центральный канал корпуса сообщаетс со скважинным пространством выше соплаСfj.According to the main author. St. No. 623954, a device is known that includes an adapter, a nozzle communicating with a diffuser, and a housing with a central channel for reverse flow. In this case, the nozzle is made annular, and the diffuser is formed by the outer surface of the body, made conical, and the walls of the well, the central channel of the body communicating with the well space above the nozzle Cfj.

При эксплуатации данного устройства при бурении скважин в сильно рассланцованных и кавернозных горных породах обратна циркул ци .мож прекратитьс из-за значительной разработки стенок скважины и уреличени зазора между корпусом устройства и стенками скважины. Это отрицательно сказываетс на эффективности бурени и может привести к прижогу коронки и аварийной ситуации.During operation of this device when drilling wells in highly dissected and cavernous rocks, the reverse circulation can stop due to the significant development of the borehole walls and the increased gap between the device casing and the borehole walls. This adversely affects the drilling performance and may cause the crown to burn out and an emergency situation.

Цель изобретени -- повышение эффективности бурени за счет обеспечени непрерывности, обратной циркулции при разработке ствола сквадины.The purpose of the invention is to increase drilling efficiency by ensuring continuity, reverse circulation in the development of a squadron trunk.

Поставленна цель достигаетс тем, что устройство снабжено эжектором, который расположен в кольцевом канале сопла и имеет спиральный канал со ступенчато-расшир ющимс сечением , сообщающийс с центральным каналом корпуса в зоне расширени сечени .The goal is achieved by the fact that the device is equipped with an ejector, which is located in the annular channel of the nozzle and has a spiral channel with a stepped-widening section, which communicates with the central channel of the housing in the expansion zone of the section.

На фиг. 1 дано устройство во взаo имосв зи его с верхней и нижней част ми бурового снар да, общий вид, на фиг. 2 - сечение А-А на фиг. 1; на фиг. 3 - сечение Б-Б на фиг. 1.FIG. 1, a device is given in conjunction with its upper and lower parts of the drill bit, a general view, FIG. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one.

Устройство состоит из переходни5 ка 1 с обратным клапаном2, кольцевого сопла 3, внутри которого размещен эжектор 4, со спиральным каналом 5. Корпус 6 соединен с -колонковым породоразрушающим инстру0 ментом 7. Кольцевое сопло выходит скважинное пространство под острым углом к оси скважины, корпус 6 устройства плавно сужаетс вниз и образует со стенками скважины диффу5 зор 8. В корпусе выполнен центральный канал 9, снабженный фильтром 10 и обратным клапаном 2 и соедин ющий внутреннюю полость колонковой трубы 7 с затрубным пространством The device consists of an adapter 1 with a check valve2, an annular nozzle 3, inside of which an ejector 4 is placed, with a spiral channel 5. Case 6 is connected to a column-type rock-breaking tool 7. The annular nozzle leaves the borehole space at an acute angle to the axis of the well, body 6 the device gradually tapers down and forms a diffuser 8 with the borehole walls. The body has a central channel 9 equipped with a filter 10 and a check valve 2 and connecting the internal cavity of the core pipe 7 with the annular space

Claims

0 above the nozzle 3 through a radial channel 11 with a suction chamber 12 equipped with a non-return valve 13. The spiral channel 5 is made with a step-expanding section. In the expansion zone of the cross section, the spiral channel is connected by a radial opening 11 to the suction chamber 12. The device works as follows. The flushing fluid from the drill pipe is injected through the spiral channel 5 of the ejector 4 into the annular nozzle 3 and into the borehole space of the diffuser 8. At the same time, passing through the spiral channel, the liquid acquires a circular motion, which results in centripetal forces of its flow. Due to the joint action of the centripetal flow force and its expansion in the zone of change of the cross section, an increased ejection discharge occurs which causes suction of fluid from the cavity of the core tube 7 through the central canal 9 and the radial hole 11. The ejected fluid together with the injected flow increases the kinetic energy of the ring jet of ejection fluids into the well space of the diffuser 8 due to the summation of their masses and a decrease in the speeds of the circular and translational motion of the flow. An increase in wellbore development in complex geological conditions causes a drop in the pressure of the injected fluid in the diffuser 8 while simultaneously increasing the effect of the kinetic energy of the flow in the spiral channel of the ejector on the creation of increased suction in the suction chamber and chamber. Due to this, the reverse circulation of the liquid does not stop, but is maintained by increasing the efficiency of the ejector. The use of this device will allow to increase the yield of core and increase the speed of drilling. The invention The device for creating a reverse circulation in the well auth. St. No. 623954, characterized in that, in order to increase drilling efficiency by ensuring continuity of reverse circulation in the development of a well bore, it is provided with an ejector, which is located in the annular channel of the nozzle and has a spiral channel with a step-widened section, communicating with the central channel of the housing in the expansion zone of the cross section Sources of information taken into account in the examination of li USSR author's certificate No. 623954, cl. E 21 B 21/00, 1978.