RU181351U1 - Core receiver - Google Patents

Abstract

The utility model relates to drilling equipment and is intended for core sampling using the rotary method or downhole motor when drilling oil and gas wells. A core receiver for inclined and horizontal wells includes a housing with upper and lower sub and centering elements, a core receiver installed in the housing on the suspension unit, a core drill assembly with an adapter mounted on the lower end of the core receiver, with centering elements mounted on the lower and upper parts of the housing with the possibility of rotation around the longitudinal axis, and the core receiver is connected to the suspension unit by means of a bearing with the possibility of rotation around the longitudinal axis. The projectile contains an automatic valve isolating composition, as well as a pressure relief valve, and the valve of the isolating composition is located in the lower part of the core receiver, is installed on the sub layout of core cutters with two shear screws and includes a housing with a stem with seals located along its axis, two automatic bypass valves, transversely equal located to the axis of the valve body of the insulating composition in its upper part opposite each other and regulating the bypass channel connected to the Central channel, p In this case, the bypass channel is made with the possibility of overlapping with a ball, pressed by the end of the bypass spring to the locking screw, and a pocket is formed between the rod and the body wall in the upper part, and core channels along the periphery with an angle to the axis of the housing are located at the same time as the valve a pressure relief valve is located in the upper part of the core receiving shell and includes a housing on which there are two automatic overpressure relief valves and two manual residual pressure relief valves, transversely equal to about located to the axis of the body, while the automatic and manual valves are located in the same plane and border between the core sampling cavity and the annulus of the drilling fluid, and in the valve body of the pressure relief valve there are also a bleed screw, a shut-off screw, a spring and a ball, while the relief valve the pressure is connected by a thread with a core receiver pipe and a sleeve mounted with an automatic mechanism to the ball suspension, the projectile comprising a core spell prevention system including a core spell signaling device and a sleeve, in this case, the core assembly layout adapter has through threaded holes located in two transverse planes at an equal distance, four in the first plane and four in the second plane, transverse to the axis of the sub, which is connected to the core structure of the core cutters with a lower end and an upper end with a core receiving pipe connected by a thread to a pressure relief valve, while a core of the core jam prevention system with shear screws with the possibility of cutting is installed on the core-tapping assembly sub and in the case of a core spell in the liner cavity. An increase in core permeability is achieved by eliminating core pistoning in the core receiver. 3 ill.

Description

MPC E21B 25/00

The utility model relates to drilling equipment and is intended for core sampling using the rotary method or downhole motor when drilling oil and gas wells.

A UCS-D / D ART core receiver device is known comprising an outer part including a connecting sub, an upper stabilizer connected to the connecting sub through an upper adapter, a housing connected to the upper stabilizer, and a lower stabilizer, an inner part including a core receiving pipe mounted on a suspension with the possibility of rotation, adjustment and fixation of its axial position relative to the drill head, and the node capture and retention of the core, while the body and the core pipe are made with possible zhnosti increase its length by incorporation of additional sections, and stabilizers are threaded nipple at both ends (RU117 964 patent, IPC E21B 25/00, publ. 10.07.2012 g).

Known core receiver for inclined and horizontal wells, comprising a housing with upper and lower sub and centering elements, a core receiver installed in the housing on the suspension unit, a core assembly installed at the lower end of the core receiver. The centering elements are made elastic and mounted on the lower and upper parts of the housing with the possibility of rotation around the longitudinal axis (patent RU18419, IPC E21B 25/00, publ. June 20, 2001). Taken as a prototype.

The disadvantages of the known device are as follows: low wear resistance of the elastic centralizer blades; difficulty in manufacturing and assembly; the need for a welded joint, creating a zone of thermal influence; zero elasticity when clogging the centralizer with sludge (breaking the centering elements of one of the elastic centralizers will complicate the drilling process).

The objective of the utility model is to provide continuous sampling of an isolated core in complex fractured rock sections with the possibility of visual tracking.

EFFECT: increased core permeability due to elimination of core pistoning in the core receiver.

The problem is solved, and the technical result is achieved by a core receiver for inclined and horizontal wells, comprising a body with upper and lower sub and centering elements, a core receiver installed in the housing on the suspension assembly, core arrangements with an adapter mounted on the lower end of the core receiver, while centering the elements are mounted on the lower and upper parts of the housing with the possibility of rotation around the longitudinal axis, and the core receiver is connected to the suspension unit by means of a bearing with the possibility of rotation around the longitudinal axis. Unlike the prototype, the projectile contains an automatic isolating valve, as well as a pressure relief valve, the isolating valve located at the bottom of the core receiver, mounted on the core assembly rotator with two shear screws and includes a body with a rod with seals located along its axis, two automatic bypass valves valves transversally equally spaced to the axis of the valve body of the insulating composition in its upper part opposite each other and regulating the bypass channel connected to the central channel, while the bypass channel is configured to overlap with a ball, pressed by the end of the bypass spring to the locking screw, a pocket is formed between the rod and the body wall in the upper part, and core guide channels located at the periphery with an angle to the axis of the body in the lower part of the body, wherein the pressure relief valve is located in the upper part of the core receiving shell and includes a housing on which there are two automatic overpressure relief valves and two residual manual relief valves phenomena transversally equally spaced to the body axis, the automatic and manual valves being located in the same plane and bordering the core sampling cavity and the annulus of the drilling fluid, and the drain screw, locking screw, spring screw and ball are also located in the pressure relief valve body this pressure relief valve is connected by a thread with a core receiver pipe and a sleeve mounted with an automatic mechanism to the ball suspension, and the projectile contains a core spell prevention system, including an alarm core blades and a sleeve, while the core-arranger sub has threaded holes located in two transverse planes at an equal distance, four in the first plane and four in the second plane, transverse to the axis of the sub, which is connected to the core arrangement with the lower end and the top - with a core-receiving pipe connected by a thread to a pressure-relief valve, while a sleeve for the core jam prevention system with shear screws is installed on the core-tapping assembly sub possibility of cutoff in case of bridging the core in the cavity of the sleeve.

The essence of the utility model is illustrated by drawings, which show:

Figure 1 is a General view of a core receiver projectile in section;

Figure 2 - valve insulating composition (CIS) in the context;

Figure 3 - pressure relief valve (KSD) in the context.

The device includes (figure 1):

1. Ball suspension (connected to a clutch connected to the KSD)

2. Arrangement of core cutters

3. Valve insulating composition

4. Core spell prevention system sleeve

5. Upper sub

6. Core spell signaling device

7. Pressure relief valve

8. Centering element

9. Device body

10. Lower sub

11. Core Arrangement Sub

            Figure 2 shows:

12. CIS body

13. Stock CIS

14. Stem nut

15. Stem spring nut

16. Stem stop

17. KIS spring

18. Screw locking CIS

19. Spring bypass KIS

20. Screw locking CIS

21. Screw shear CIS

22. The seal of the Central channel

23. A sealant for a cavity of a core receiver pipe

24. Ball KIS

25. Input channel

26. Bypass

27. Pocket

28. Central channel

29. Guide channel

In figure 3:

30. KSD housing

31. Screw drain KSD

32. Screw locking KSD

33. KSD spring

34. KSD ball

The core receiver works as follows.

Before the descent into the well, the device is assembled, after which the drill pipes are connected and the device is lowered to the bottom of the well.

The valve of the insulating composition (CIS) 3 (Fig. 1), touching the bottom earlier than the burgole head (not shown), is activated and the liquid insulating medium envelops the core, providing minimal contact with the drilling fluid. Next, the CIS 21 screws (Fig. 2) are routinely cut off and the CIS passes up the core receiver pipe. The core spell prevention system (SPSC) is triggered by a single spell, the core sticks in the sleeve 4 (Fig. 1), the screws are cut off, and the core 4 with the core moves up the core receiver pipe. The core 6 spell signaling device signals the operation of a cut of KIS 3 screws, a cut of SPZK screws, then a repeated spell.

The activation of the CIS (Fig. 2) occurs by touching the stop 16 on the bottom and, as the axial load increases, the rod 13 starts moving. The rod 13, moving, opens the channels and the insulating liquid from the housing pocket 27 is poured through the channels 29 to the distribution holes (mainly in the amount of 8), which are evenly distributed along the contour for enveloping the core. CIS is activated and isolates the core with an insulating liquid. The design of the rod 13 has coaxial with each other four cylindrical guides for rectilinear movement inside the housing 12. On two cylindrical rod guides 13 laid channels for the passage of fluid insulating composition. From the left end of the rod in the axis there is a blind hole for access to the pocket 27 with four through holes. The housing 12 is a rotation body with two cylindrical protrusions - the upper and lower, on the upper there are grooves for the seal, the lower one is smooth to center and prevent distortion inside the core-receiving cavity. Automatic valves mounted on the KIS body open the bypass channel 26 at overpressure. When excessive pressure occurs, the insulating liquid communicates through the inlet channel 25, pocket 27, the central channel 28, the bypass channel 26, presses on the ball 24, transmitting a pressure force to the bypass spring 19, which opens the channel for bypassing the insulating liquid. When the pressure decreases, the spring 19 and the ball 24 return to their original position.

When the overpressure is activated valve KSD (figure 3). The pressure exerts emphasis on the ball 34, which transfers the pressure to the spring 33, the spring 33 and the ball 34 are displaced, and when the pressure decreases, the ball and the spring return to their original position.

Using the valve manual action KSD (figure 3). On the surface of the rig, before proceeding with the dismantling of the core, it is necessary to carry out the procedure for the safety of core work as follows. Turn the key for the drain screw 31 one turn to release the residual pressure, make sure that the pressure is completely relieved, and remove the drain screw 31 completely. After depressurization, proceed to dismantle the core receiving parts to extract the core.

SZK 6 works due to the movement of the rod and the spring KIS. The core sticks in the core receiver, the core pickup, moving in the drilling mode, compresses the spring and the CIS rod, then, moving forward, it blocks the drilling fluid holes, as a result of this, the pressure increases, and the pressure gauges of the drilling pumps indicate increasing pressure, thereby visualizing the wedge.

Activation of the sub 5 (Fig.1). In the event of an emergency, for example, a sticking of the body parts of a core sampling shell, the top 5 sub with a certain moment is twisted by left rotation, disconnected from the core sampling shell and carried out together with the core receiver to the surface of the drill.

The activation of the sleeve 4 (figure 1) is as follows. When the fractured core is jammed into the liner cavity liner, the projectile continues to move in the drilling mode, creating an axial load, and at a certain load, the screws holding the liner 4 are cut off, the liner moves up with the core in drilling mode, and SZK 6 (Fig. 1) into this the moment will show the pressure change during drilling due to the overlapping of the openings of the SZK rod.

The technical result is achieved by actuating the automatic pressure relief valves KSD. Pistoning of the core in the core receiver occurs with a snug fit of the loose core with its subsequent shedding in the core receiver - a piston effect is created, i.e. bung. An enclosed space is formed with a certain pressure, the core is stopped and, as a result, the coring shell does not advance during drilling. It is necessary to relieve pressure without creating a confined space in the core-receiving cavity, i.e. open the plug in the core receiver, relieving pressure in the annular cavity of the drilling fluid. This achieves the breaking of the chain of confined space, the core passage is freed, and the core is guaranteed to pass further, filling the cavity of the core receiver.

Claims (1)

A core receiver for inclined and horizontal wells, comprising a body with upper and lower sub and centering elements, a core receiver installed in the housing on the suspension unit, a core drill assembly with an adapter mounted on the lower end of the core receiver, with centering elements mounted on the lower and upper parts housing with the possibility of rotation around the longitudinal axis, and the core receiver is connected to the suspension unit by means of a bearing with the possibility of rotation around the longitudinal axis, characterized in that contains an automatic valve of the isolating composition, as well as a pressure relief valve, the valve of the isolating composition located in the lower part of the core receiver, mounted on the sub assembly of core cutters with two shear screws and includes a body with a stem with seals located along its axis, two automatic bypass valves, transversely equally located to the axis of the valve body of the insulating composition in its upper part opposite each other and regulating the bypass channel connected to the Central channel, when In this case, the bypass channel is made with the possibility of overlapping with a ball pressed by the end of the bypass spring to the locking screw, and a pocket is formed between the rod and the body wall in the upper part, and core guide channels located at the periphery with an angle to the axis of the housing in the lower part of the body, with a relief valve pressure is located in the upper part of the core receiving projectile and includes a housing on which there are two automatic overpressure relief valves and two manual residual pressure relief valves, transversely equal to located to the axis of the housing, while the automatic and manual valves are located in the same plane and border between the core sampling cavity and the annular space of the drilling fluid, and in the housing of the pressure relief valve there are also a drain screw, a shut-off screw, a spring and a ball, while the pressure relief valve threaded to a core receiving pipe and a sleeve mounted with an automatic mechanism to the ball suspension, the projectile comprising a core spell prevention system including a core spell signaling device and a sleeve, p moreover, the core-arranger arrangement sub has through threaded holes located in two transverse planes at equal distance, four in the first plane and four in the second plane, transverse to the axis of the adapter, which is connected to the core-breaker arrangement with the lower end and the upper with a core-receiving pipe connected by a thread to a pressure-relief valve, while a core of the core jam prevention system with shear screws with the possibility of cutting is installed on the core-tapper sub in the case of a core spell in the liner cavity.

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