SU821681A1

SU821681A1 - Guiding device for ptpe string bottom

Info

Publication number: SU821681A1
Application number: SU792725372A
Authority: SU
Inventors: Марат Давлетшинович Еникеев
Original assignee: Всесоюзный Научно-Исследовательскийинститут Нефтепромысловой Геофизики
Priority date: 1979-02-19
Filing date: 1979-02-19
Publication date: 1981-04-15

Description

Изобретение относитс к скважинным устройствам нефтегазодобывающей промышленности и может быть применено при работе с испытателем пластов в процессе бурени скважин.The invention relates to downhole devices of the oil and gas industry and can be applied when working with a formation tester during the drilling of wells.

Дл улучшени проходимости колонны труб хвостовой опоры испытател пластов в скважине с резкими перегибами ствола, уступами и кавернами примен ют направл ющие устройства, которые устанавливают на нижнем конце колонны труб хвостовой опоры.In order to improve the permeability of the column of test tube tail support in the well with sharp bends, ledges and cavities, guide devices are used which are mounted on the lower end of the tail support string.

Известно направл ющее устройство, предетавл пощее наконечник с конической поверхностью A guiding device is known, which is a pre-tip tip with a conical surface.

Однако в. сильно искривленных скважинах при применении хвостовых опор с большой жесткостью направл ющие устройства с коническим наконечником не обеспечивеиот успешность спуска испытателей пластов, так как они не исключают возникновение дополнительных сил сопротивлени за счет упора конца хвостовой опоры в стенку скважины и сил упругости из-за его изгиба .However c. highly curved wells when using tailings with high rigidity, guide devices with a conical tip do not ensure successful descent of formation testers, since they do not exclude the occurrence of additional resistance forces due to the stop of the end of the tail support in the borehole wall and elastic forces due to its bending.

Известно направл ющее устройство дл низа колонны труб, включак цее корпус с опорным уступом а :нижнейA guide device for the bottom of the pipe string is known, including a body with a support step a:

части, подпружиненный стабилизатор с коническим наконечником, на котором с двух противоположных сторонparts, spring-loaded stabilizer with a conical tip, on which from two opposite sides

5 выполнены срезы, а корпус и стабилизатор соединены между собой посредством черв чной пары. Когда стабилизатор встречает преп тствие в виде уступа, то с помощью черв чной пары5 cuts are made, and the housing and the stabilizer are interconnected by means of a worm pair. When the stabilizer encounters an obstacle in the form of a ledge, then with the help of a screw pair

10 поворачиваетс вокруг своей оси стороной с боковым срезом и сходит с уступа 2j ,10 rotates around its axis with a side cut and leaves the ledge 2j,

Однако это устройство имеет низкую направл ющую способность, т.е.However, this device has a low guiding ability, i.e.

5 не позвол ет свободно отклон тьс 5 does not allow free deviation

Claims

on the lower part of the device, when meeting, with an obstacle, since the stabilizer has a telescopic junction with the body with an axial gesture of bone 2Q. This is the reason for the emergence of additional forces of resistance to the movement of the tail support under the action of the elastic forces of the pipes and due to the stop of the lower end of the tail support. borehole wall, especially in the wellbore with significant kinks, ledges and cavities, which reduces the success of the descent of test formations in a well with a complex pro. jQ curvature. The purpose of the invention is to improve the reliability of the device due to the free radial deviation of the lower part of the stabilizer with a directional tip when it encounters an obstacle in the process of lowering the tool into the well. This goal is achieved by the fact that the surface of the upper part of the stabilizer and the inner surface of the lower part of the body have a frusto-conical shape with a large base on the side of the tip. FIG. 1 shows a guide device for a bottom pipe string in its initial position; FIG. 2 shows section A-A in FIG. 1, in FIG. 3 - device when changing the direction of the well. The device consists of an upper locking sub 1, a cylindrical body 2 spring-loaded with a spring 3 of the stabilizer 4, a lower locking sub 5 and a tip 6 to enable the stabilizer to deflect the guide tip when it encounters an obstacle in the form of ledges, cavities and sharp bends The outer surface of the stabilizer in the upper part has the shape of a truncated cone with longitudinal grooves 7 and the inner surface of the body in the lower part has the shape of a truncated cone with a protrusion 8, moreover Chiyah base truncated cones facing towards the nozzle used. The protrusion of the upper stage of the stabilizer 4 rests on the protrusion of the lower stage of the body 2. Such a constructive design and connection of the stabilizer with the body ensures that the stabilizer is deflected in any radial direction. The presence of longitudinal slots in the stabilizer and protrusions in the housing ensures the possibility of torque transmission. The guiding device is mounted on the lower end of the column string of the tester's tail support. In the process of lowering the tool in a bent hole, when encountering an obstacle, the guide tip with the Stabilizer deflects (Fig. 3 and slides down. This prevents the creation of additional resistance forces due to the elasticity of the pipes and the stop of the tip in the barrel wall with When the tool is unloaded onto the bottom, the spring is pressed and the casing is supported on the end of the lower locking guide, which ensures the normal operation of the components of the test tester. The design of the proposed device allows It is also possible to install between the locking joints of the tail support elements in order to distort the assembly and cause it to penetrate into highly curved parts of the barrel. Therefore, when the tool is lowered into the well with significant distortions of the trunk, the device with the removed tip 6 can be additionally installed with lock holes connections of the elements of the tail support. This improves the permeability of the tail support by reducing the resistance forces from the contact pressure under the action of elastic forces from mentioned pipe string, especially when using tail support with considerable rigidity. The use of a guide device in conjunction with the formation testers prevents the tool from landing when the complicated part of the trunk passes and eliminates the possibility of the early testing of the formation tester - closing the balancing valve and opening the intake valves. Thus, the proposed guide device for the bottom of the tubing ensures the successful descent of formation testers in wells with sharp bends, cavities, ledges and constrictions, which eliminates the cost of additional development of the reservoir into the well. The invention of the guide device for the bottom of the pipe string, including a housing with a support ledge at the bottom, installed with the ability to interact with it a spring-loaded stabilizer and a tip, so that, in order to improve reliability The devices, the outer surface of the upper part of the stabilizer and the inner surface of the lower part of the body have the shape of a truncated cone with a large base on the side of the tip. Sources of information taken into account in the examination 1.Karaev AK and others. Casing strings for deep wells. M., Nedra, 1971, p. 93.

2. USSR author's certificate number 470586, cl. E 21 17/14, 1974.