CN105239962B - With brill with hydraulic control device under kill-job - Google Patents

Abstract

One kind is with brill with hydraulic control device under kill-job.Main purpose is to provide a kind of downhole hardware, the problem of needing to change tubing string when can be solved using the device and be carried out drilling well and pressure break at present, it is possible to achieve pressure break is carried out while drilling well.It is characterized in that：The device is made up of several parts such as outer barrel top, outer barrel bottom, inner cylinder, ball-and-seat closure member and springs；Wherein, with teeth and neck is all designed at the top of part under the bottom of part and outer barrel on outer barrel, and the tooth being engaged is designed with the outer wall of inner cylinder and inwall, there is pod apertures at upper end, and ball-and-seat closure member is arranged in the middle part of inner cylinder end face；Wherein inner cylinder and spring are arranged in outer barrel, and two parts are connected through a screw thread above and below outer barrel.The device connects inflatable packer and sanding machine, can realize connection and closure in drilling rod by controlling controlling flow direction, and then realize drilling well and the conversion of pressure break.

Description

Downhole hydraulic control device while drilling and pressing

Technical field:

The invention relates to downhole equipment used in the field of oil and gas field development engineering.

Background technique:

With the consumption of energy, the development of unconventional oil and gas has been paid more and more attention. In the process of unconventional oil and gas development, in order to increase production, multilateral wells can be drilled or hydraulic fracturing can be implemented after drilling. Although drilling multilateral wells can increase production, the effect is limited. In order to further improve the production degree of oil and gas, hydraulic fracturing can be implemented on branch wells, but it is difficult to lower the fracturing string into branch wells in current technology, so there are technical difficulties in fracturing branch wells. If hydraulic fracturing is implemented after drilling, all downhole drill strings need to be raised and replaced with fracturing strings. However, the process of replacing strings will consume a lot of time, manpower and material resources, which seriously affects the efficiency of development. If fracturing can be performed while drilling, it can solve the problem that branch wells cannot be fractured and replacement of pipe strings takes time and effort.

Invention content:

In order to solve the technical problems mentioned in the background technology, the present invention provides a pressure-while-drilling downhole hydraulic control device, which is simple in structure, ingenious in design, easy to disassemble and install The flow direction of the liquid realizes the connection and plugging in the drill pipe, and then realizes the conversion between drilling and fracturing.

The technical solution of the present invention is: the pressure-while-drilling downhole hydraulic control device includes an upper part of an outer cylinder, a lower part of an outer cylinder, an inner cylinder, a check valve closing member and a spring, and is characterized in that:

The upper part of the outer cylinder has an internal cavity and an outlet of the outer cylinder, and the inner cavity intersects with the outlet of the outer cylinder at the end face of the outlet of the outer cylinder; the inner wall of the inner cavity is provided with deep grooves and shallow grooves, between the deep groove and the outlet Between the shallow grooves are outer cylinder inner wall teeth, the outer cylinder inner wall teeth have outer cylinder inner wall tooth end surfaces, and the outer cylinder inner wall tooth end surfaces are smooth slopes; the bottom end of the upper part of the outer cylinder is used to connect with the lower part of the outer cylinder There are internal threads at the connection;

The lower part of the outer cylinder is also a hollow cylinder, and the inner side of the bottom of the lower part of the outer cylinder has lower teeth of the outer cylinder, and the lower groove of the outer cylinder is formed between the tooth wall of the lower teeth of the outer cylinder and the inner side wall of the lower part of the outer cylinder. The groove width of the lower groove of the outer cylinder matches the width of the spring to realize the installation of the spring; the lower teeth of the outer cylinder have the lower tooth end surface of the outer cylinder, and the lower tooth end surface of the outer cylinder is a smooth inclined surface; The joint used to connect with the upper part of the outer cylinder is provided with external threads;

The inner cylinder has two hollow cavities with different diameters, the upper and the lower. The upper and lower hollow cavities are separated by the installation hole of the check valve closing member, and there are several openings around the installation hole of the check valve closing member. diversion holes; the bottom end of the outer wall of the inner cylinder is provided with inner cylinder outer wall teeth, the inner cylinder outer wall teeth have inner cylinder outer wall tooth end surfaces, the inner cylinder outer wall tooth end surfaces are smooth slopes, and the inner cylinder bottom end of the inner wall is opened with inner The tooth on the end surface of the cylinder has the end surface of the tooth on the inner cylinder end surface, and the end surface of the tooth on the inner cylinder end surface is a smooth slope; the upper hollow cavity of the inner cylinder has an outlet end surface of the inner cylinder;

Wherein, the outer wall teeth of the inner cylinder are meshed with the inner wall teeth of the outer cylinder, so that relative sliding can occur between the end faces of the outer wall teeth of the inner cylinder and the end faces of the inner wall teeth of the outer cylinder under the action of one end pressure, so as to realize that the inner cylinder is on the upper part of the outer cylinder. Rotation in the center; the teeth on the end face of the inner cylinder mesh with the teeth on the lower part of the outer cylinder, so that relative sliding can occur between the end faces of the teeth on the lower part of the outer cylinder and the end faces of the teeth on the inner cylinder under the action of one end pressure, so as to realize that the inner cylinder is in the lower part of the outer cylinder rotation in

The closing part of the check valve is composed of the lower end face of the check valve, the upper end face of the check valve and a cylindrical rod; the lower end face of the check valve is matched with the outlet end face of the inner cylinder to set and seal the end face; The end face matches the outlet end face of the outer cylinder and is used to set the end face;

The upper part of the outer cylinder, the lower part of the outer cylinder, the inner cylinder, the closing part of the check valve and the spring are connected as follows. The cylinder is installed in the upper part of the outer cylinder, and the outer wall teeth of the inner cylinder can enter deep grooves or shallow grooves. When the outer wall teeth of the inner cylinder alternate between deep grooves and shallow grooves, the inner cylinder can rotate, and the spring is placed in the lower groove of the outer cylinder; The upper part is closely connected with the lower part of the outer cylinder through threads, and the end face of the inner cylinder compresses the spring in the lower groove of the outer cylinder.

The invention has the following beneficial effects: the device can be threadedly connected to the drill pipe without large-scale modification of the drill pipe, and only needs to connect a sand blaster and an expansion packer to the drill pipe during use, which is convenient and practical; The device can realize the connection and blockage in the drill pipe by controlling the flow direction of the liquid. When in use, it only needs to control the flow of the liquid on the ground to make the inner cylinder rotate, and then realize the switch of the valve. When the valve is in the open state, the liquid can circulate inside and outside the drill pipe through the diversion hole, and the well can be drilled normally. When the valve is in the closed state, the inside of the drill pipe is not connected, and the pressure can be suppressed in the drill pipe to set the packer. The blaster is turned on and the formation is fractured. This device skillfully combines drilling and fracturing, so that it can realize pressure while drilling. A set of pipe strings is used for drilling and fracturing, which solves the problems of frequent replacement of pipe strings and fracturing of multi-branch wells, and saves drilling equipment. and fracturing equipment relocation time, reducing the cost of oil and gas extraction.

Description of drawings:

Fig. 1 is a schematic diagram of a three-dimensional structure of the present invention.

Fig. 2 is a structural sectional view of the present invention.

Fig. 3 is a three-dimensional structure diagram of the inner cylinder of the present invention.

Fig. 4 is a structural sectional view of the inner cylinder of the present invention.

Fig. 5 is a three-dimensional structure diagram from another perspective of Fig. 3 .

Fig. 6 is a three-dimensional structural diagram of the upper part of the outer cylinder of the present invention.

Fig. 7 is a three-dimensional structure diagram of the one-way valve closing member of the present invention.

Fig. 8 is a three-dimensional structural view of the lower part of the outer cylinder of the present invention.

In the figure 1- the upper part of the outer cylinder, 2- the lower part of the outer cylinder, 3- the inner cylinder, 4- the closing part of the check valve, 5- the upper end surface of the check valve, 6- the spring, 7- the outer wall teeth of the inner cylinder, 8- the outer wall teeth End face, 9-outlet of outer cylinder, 10-end face of outlet of outer cylinder, 11-deep groove, 12-shallow groove, 13-guiding hole, 14-installation hole of check valve closing part, 15-end tooth of inner cylinder, 16- Outer cylinder lower teeth, 17-outer cylinder lower groove, 18-inner cylinder end face tooth end face, 19-inner cylinder outlet end face, 20-outer cylinder inner wall teeth, 21-check valve lower end face, 22-outer cylinder lower tooth end face, 23-the tooth end surface of the inner wall of the outer cylinder.

detailed description:

The present invention will be further described below in conjunction with accompanying drawing:

The device is used in conjunction with other components when working, that is, it is used after being connected with the drill string, sand blaster and packer. The upper part 1 of the outer cylinder is connected to the drill string near the drill bit end through threads, the upper part 1 of the outer cylinder is connected with the lower part 2 of the outer cylinder through threads, and the lower part 2 of the outer cylinder is connected with a section of drill string through threads and then connected to the sand blaster, and the other end of the sand blaster The packer is connected, and the other end of the packer is connected to the drill string near the surface. The device is connected to the drill string through the above connection relationship.

As shown in Figure 1, this kind of downhole hydraulic control device while drilling and pressure includes: the upper part of the outer cylinder 1, the lower part of the outer cylinder 2, the inner cylinder 3, the check valve closing part 4 and the spring 6, and its unique features are: As shown in Fig. 6 in conjunction with Fig. 1 and Fig. 2, the upper part 1 of the outer cylinder is a hollow cylinder, and the upper part 1 of the outer cylinder has an outlet 9 and a cavity, both of which intersect at the end face 10 of the outlet of the outer cylinder; the inner wall of the cavity There are deep grooves 11 and shallow grooves 12; between the deep grooves 11 and the shallow grooves 12, there are outer cylinder inner wall teeth 20 and outer cylinder inner wall tooth end faces 23; there are threads at the connection between the upper part 1 of the outer cylinder and the lower part 2 of the outer cylinder;

As shown in Fig. 8 in conjunction with Fig. 1 and Fig. 2, the lower part of the outer cylinder 2 is composed of the tooth end surface 22 of the lower part of the outer cylinder, the lower groove 17 of the outer cylinder and the cavity; wherein the spring 6 is installed in the lower groove of the outer cylinder; There are threads at the connection of the upper part 1 of the outer cylinder;

As shown in Figures 3, 4, and 5 in conjunction with Figures 1 and 2, the inner cylinder 3 is composed of two hollow cylinders up and down; there are several diversion holes 13 at the junction of the hollow cylinders, and a check valve is closed in the middle. Parts mounting holes 14; the outer wall of the inner cylinder has inner cylinder outer wall teeth 7; the inner cylinder inner wall has inner cylinder end face teeth 15; the inner cylinder outer wall teeth 7 are meshed with the outer cylinder inner wall teeth 20, because the inner cylinder outer wall tooth end surface 8 and the outer The tooth end surfaces 23 of the inner wall of the cylinder are all smooth slopes, and the two tooth end surfaces slide relative to each other under the pressure of one end, so that the inner cylinder 3 rotates in the upper part 1 of the outer cylinder; the teeth 15 on the end surface of the inner cylinder mesh with the lower teeth 16 of the outer cylinder, Since the tooth end surface 18 of the end surface of the inner cylinder and the tooth end surface 22 of the lower part of the outer cylinder are both smooth inclined surfaces, the two tooth end surfaces slide relative to each other under the pressure of one end, thereby realizing the rotation of the inner cylinder 3 in the lower part 2 of the outer cylinder;

As shown in Fig. 7 in conjunction with Fig. 1 and Fig. 2, the check valve closing member 4 is composed of a check valve lower end surface 21, a check valve upper end face 5 and a cylindrical rod; wherein the check valve lower end face 21 is set The outlet end face 19 of the inner cylinder and the upper end face 5 of the check valve are set to seal the outlet end face 10 of the outer cylinder.

The connection relationship of the above-mentioned components is: the check valve closing member 4 is installed in the check valve closing member installation hole 14 on the inner cylinder 3 and can move freely therein, the inner cylinder 3 is installed in the upper part 1 of the outer cylinder, and the outer wall of the inner cylinder The teeth 7 can enter deep grooves 11 or shallow grooves 12. When the teeth 7 on the outer wall of the inner cylinder alternate between the deep grooves 11 and the shallow grooves 12, the inner cylinder 3 can rotate, and the spring 6 is placed in the lower groove 17 of the outer cylinder. 1 is closely connected with the lower part of the outer cylinder 2 through threads, and the end surface of the inner cylinder 3 can compress the spring 6 in the groove 17 at the lower part of the outer cylinder, and at the same time, the teeth 15 on the end surface of the inner cylinder and the teeth 16 on the lower part of the outer cylinder mesh with each other.

The device constitutes a switch that controls the valve through the flow direction of the liquid. The teeth 7 on the outer wall of the inner cylinder are in the shallow groove 12, the upper end surface 5 of the check valve cannot set the outlet end surface 10 of the outer cylinder, and the liquid can pass through in the forward direction; the liquid flows in the reverse direction, and the lower end surface 21 of the check valve sets the outlet end surface 19 of the inner cylinder, Push the inner cylinder to move, the end face teeth 15 of the inner cylinder contact the lower teeth 16 of the outer cylinder, and the inner cylinder 3 rotates; the liquid flows forward, the check valve closing part 4 opens, the spring 6 pushes the inner cylinder 3 to move, and the outer wall teeth 7 of the inner cylinder contact The teeth 20 on the inner wall of the outer cylinder enter the deep groove 11, the upper end surface 5 of the check valve sets the outlet end surface 10 of the outer cylinder, and the liquid cannot pass through; the liquid flows in the reverse direction, and the lower end surface 21 of the check valve sets the outlet end surface 19 of the inner cylinder to push the inner cylinder to move , the end face teeth 15 of the inner cylinder contact the lower teeth 16 of the outer cylinder, and the inner cylinder 3 rotates; the liquid flows forward, the check valve closing part 4 opens, the spring 6 pushes the inner cylinder 3 to move, and the outer wall teeth 7 of the inner cylinder contact the inner wall teeth of the outer cylinder 20 enters the shallow groove 12, the upper end surface 5 of the check valve cannot set the outlet end surface 10 of the outer cylinder, and the liquid can pass through.

When the teeth on the outer wall of the inner cylinder are in shallow grooves, the drilling fluid passes through normally, and the drilling proceeds normally; after the liquid is injected in the reverse circulation, the liquid is circulated normally, and the central channel of the downhole hydraulic control device is closed while drilling, and a higher pressure packer is pumped into it. When the seal is closed, the sand blaster is opened, and the formation can be fractured; after the liquid is injected into the reverse circulation, the liquid is circulated, and the central channel of the downhole hydraulic control device is opened while drilling, and the drilling fluid can circulate normally and drill normally.

The working engineering of this device is as follows:

After the drill bit is connected to a section of drill string and then to the device, after the device is connected to a section of drill string, the sand blaster and the expansion packer are connected in sequence.

During the normal drilling process, the outer wall teeth 7 of the inner cylinder are stuck in the shallow groove 12, and the liquid can pass through the diversion hole 13 and push the closing part 4 of the check valve. At this time, the upper end surface 5 of the check valve is not set at the outlet of the outer cylinder. At the end face 10, the liquid can flow to the drill bit through the outlet 9 of the outer cylinder; when the target layer needs to be fractured, the ground reverse circulation injects liquid into the annular space between the drill string and the wellbore, and the pressure of the liquid acts on the upper end face 5 of the check valve and pushes the The check valve closing part 4 moves until the check valve closing part 4 is set on the outlet end surface 19 of the inner cylinder, and the liquid cannot pass through in the opposite direction. At this time, the liquid pressure acts on the inner cylinder 3 and pushes the inner cylinder 3 to move and compress Spring 6, until the end face teeth 15 of the inner cylinder mesh with the lower teeth 16 of the outer cylinder, the inner cylinder rotates, and then the ground positively circulates to inject liquid into the drill string, and the inner cylinder 3 moves under the action of the thrust of the liquid and the elastic force of the spring 6 until The outer wall teeth 7 of the inner cylinder mesh with the inner wall teeth 20 of the outer cylinder, the inner cylinder 3 rotates, and the outer wall teeth 7 of the inner cylinder are stuck in the deep groove 11. At this time, the upper end surface 5 of the check valve is set to seal the outlet end surface 10 of the outer cylinder, and the liquid Do not pass through outlet 9 of the outer cylinder, pump pressure on the ground, set the packer, and pump in a higher pressure sand blaster to open the formation for fracturing. When needing to continue drilling, the above operations can be repeated, so that the outer wall teeth 7 of the inner cylinder are in the shallow grooves 12, and the liquid can flow to the drill bit through the outlet 9 of the outer cylinder.

Claims (1)

1. one kind is with brill with hydraulic control device under kill-job, including outer barrel top (1), outer barrel bottom (2), inner cylinder (3), ball-and-seat Closure member (4) and spring (6), it is characterised in that：

Outer barrel top (1) has internal cavities and is provided with outer barrel outlet (9), and the internal cavities are intersected at outer barrel outlet (9) Outer barrel exit end face (10) place；The inwall of the internal cavities is provided with deep trouth (11) and shallow slot (12), in deep trouth (11) and shallow slot (12) it is outer tube inner wall tooth (20) between, outer tube inner wall tooth (20) has outer tube inner wall increment face (23), outer tube inner wall increment face (23) it is smooth bevel；The junction for being used to be connected with the outer barrel bottom in the bottom on the outer barrel top is provided with interior spiral shell Line；

Outer barrel bottom (2) is also to have outer barrel lower teeth (16), outer barrel bottom on the inside of hollow cylinder, the bottom of the outer barrel bottom Outer barrel lower channel (17), the groove width of the outer barrel lower channel are formed between the tooth wall of tooth (16) and the madial wall of the outer barrel bottom Match to realize the installation to the spring with the width of spring (6)；Outer barrel lower teeth (16) has outer barrel lower teeth end face (22), outer barrel lower teeth end face (22) is smooth bevel；It is used to be connected with the outer barrel top on the top of the outer barrel bottom The junction connect is provided with external screw thread；

Inner cylinder (3) had and closed between the different hollow cavity of upper and lower two diameters, upper and lower two hollow cavities by ball-and-seat Closing member mounting hole (14) separates, and around the ball-and-seat closure member mounting hole is provided with several pod apertures (13)；The inner cylinder Outer wall bottom be provided with inner tank theca tooth (7), inner tank theca tooth (7) has inner tank theca increment face (8), inner tank theca increment face (8) it is smooth bevel, the inwall bottom of the inner cylinder is provided with inner cylinder end-tooth (15), interior with inner cylinder end-tooth end face (18) Cylinder end-tooth end face (18) is smooth bevel；The upper hollow cavity of inner cylinder (3) has inner cylinder exit end face (19)；

Wherein, the inner tank theca tooth (7) is meshed with outer tube inner wall tooth (20) so that inner tank theca increment face (8) with Can occur relative slip under pressure effect at one end between the end face in outer tube inner wall increment face (23), to realize that inner cylinder (3) exists Rotation in outer barrel top (1)；The inner cylinder end-tooth (15) is meshed with outer barrel lower teeth (16), so that outer barrel bottom Can occur relative slip under pressure effect at one end between increment face (22) and inner cylinder end-tooth end face (18), to realize inner cylinder (3) rotation in outer barrel bottom (2)；

The ball-and-seat closure member (4) is made up of ball-and-seat lower surface (21) and ball-and-seat upper end face (5) and cylinder rod；Its Middle ball-and-seat lower surface (21) is engaged with inner cylinder exit end face (19), for setting the end face；Ball-and-seat upper end face (5) with it is outer Cylinder exit end face (10) is engaged, for setting the end face；

Outer barrel top (1), outer barrel bottom (2), inner cylinder (3), ball-and-seat closure member (4) and spring (6) connect as follows Connect, ball-and-seat closure member (4) is in the ball-and-seat closure member mounting hole (14) on inner cylinder (3) and can freely live wherein Dynamic, inner cylinder (3) is arranged in outer barrel top (1), and inner tank theca tooth (7) can enter in deep trouth (11) or shallow slot (12), inner cylinder When outer parietal tooth (7) replaces between deep trouth (11) and shallow slot (12), inner cylinder (3) can rotate, and spring (6) is placed in outer barrel bottom In groove (17)；Outer barrel top (1) and outer barrel bottom (2) are closely coupled by screw thread, and the end face of inner cylinder (3) compresses spring (6) In outer barrel lower channel (17).