CN202000969U - Anti-top self-unloading drain tool - Google Patents

Abstract

The top-up-preventing self-unloading liquid drainage tool is applied to liquid drainage and gas production in oil and gas exploitation. The outer wall of the cylindrical main body is sleeved with a connecting neck, and a slip is hung at the lower end of the connecting neck. An annular valve seat is fixed in a central hole at the lower end of the main body, and a steel ball is arranged at the upper part of the valve seat; a transverse hole is formed in the side wall of the central hole of the main body; a mandrel is fixed at the lower end of the central hole of the main body through threads; the outer wall of the mandrel is sleeved with a rubber cylinder assembly, a spring seat and a spring, and the upper end of the mandrel wall is provided with an unloading hole; a ring-shaped guide head is fixed at the lower part of the spring and the lower end of the outer wall of the mandrel in a threaded manner. The guide head compresses the spring. The effect is as follows: the slip can be fixed on the wall of the oil pipe through the slip, so that tools are prevented from being quickly stringed to cause the bending of a test wire; when the lifting liquid mass exceeds the limit lifting mass, the redundant liquid is unloaded and adjusted through the unloading holes, and drainage and gas production are realized. The tool has simple structure, easy processing and simple and convenient operation.

Description

Anti-top self-unloading drain tool

technical field

The utility model relates to the technical field of petroleum and natural gas exploitation, in particular to an operation tool in a natural gas wellbore, which is an anti-topping self-unloading liquid drainage tool.

Background technique

In the middle and later stages of natural gas production, the energy at the bottom of the well is not enough to carry the water produced in the gas layer to the surface, and fluid accumulation will occur in the wellbore. The existence of fluid accumulation will increase the back pressure on the formation and limit its production capacity, and eventually the gas formation will be completely crushed and the well will be shut down. At present, downhole chokes are widely used in production in the Sulige gas field, and some gas wells have severe liquid accumulation above the chokes, which has caused the gas wells to be completely crushed to death. Due to the existence of downhole restrictors and the low energy of gas wells, traditional physical and chemical drainage and gas recovery methods cannot be adopted for such wells, while traditional mechanical drainage and gas recovery methods (such as electric submersible pumps) have complex equipment structures, high technical difficulties, and high costs. It is not suitable for economical and effective development of gas fields.

Utility model content

The purpose of this utility model is to provide an anti-top self-unloading liquid discharge tool, which is fixed on the oil pipe wall. When the lifting liquid quality exceeds the limit lifting quality, the tool will discharge the excess liquid through the unloading hole. Realize drainage and gas recovery; overcome the deficiency that conventional drainage and gas recovery methods cannot implement gas recovery for such wells.

The technical solution adopted by the utility model is: the anti-top self-unloading liquid discharge tool, which is mainly composed of a connecting neck, a main body, a slip, a steel ball, a valve seat, a rubber tube assembly, a spring seat, a spring, a guide head, and a mandrel. composition. A connecting neck is set on the outer wall of the cylindrical main body, and a slip is suspended at the lower end of the connecting neck. The inner wall of the lower end of the slip is on the conical slope of the main body; Outward expansion, fixed on the well wall. The structure of the slips and the connecting neck is well known to those skilled in the art. It is characterized in that: there is a central hole at the lower end of the main body, an annular valve seat is fixed in the central hole of the main body, and a steel ball is arranged on the upper part of the valve seat; there are uniformly distributed transverse holes on the side wall of the central hole of the main body The position of the transverse hole is on the upper part of the steel ball; there are threads on the inner wall of the lower end of the central hole of the main body; A rubber cartridge assembly is sleeved on the outer wall of the mandrel; a spring seat is set on the lower part of the rubber cartridge assembly and on the outer wall of the mandrel, and the spring seat is circular; the lower part of the spring seat is set on the outer wall of the mandrel There is a spring; an annular guide head is threadedly fixed at the lower part of the spring and at the lower end of the outer wall of the mandrel. The guide head compresses the spring so that the rubber cartridge assembly is in close contact with the lower end surface of the main body.

In order to improve the sealing performance, there is a ○-shaped sealing ring between the rubber cartridge assembly and the mandrel.

The rubber sleeve assembly is composed of a rubber bowl and a sleeve, and the rubber bowl is fixed on the outer wall of the sleeve.

The spring is a compression spring.

Beneficial effects of the utility model: the utility model anti-upper self-unloading liquid discharge tool can be fixed on the oil pipe wall through slips, so as to prevent the tool from being fastened on the string to make the well test steel wire discounted; when the lifting liquid quality exceeds the limit When the quality is increased, the excess liquid is discharged through the unloading hole to realize drainage and gas recovery; this tool has simple structure, easy processing, low cost and easy operation.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the structure of the utility model anti-top self-unloading liquid drainage tool.

In the figure, 1-connecting neck, 2-main body, 3-slips, 4-steel ball, 5-Valle seat, 6-O-shaped sealing ring, 7-rubber cartridge assembly, 8-spring seat, 9-spring, 10-guide head, 11-mandrel.

Detailed ways

Embodiment 1: Taking an anti-top self-unloading liquid drainage tool as an example, the utility model is further described in detail.

See Figure 1. The utility model anti-upper self-unloading liquid discharge tool is composed of a connecting neck 1, a main body 2, a slip 3, a steel ball 4, a valve seat 5, a ○-shaped sealing ring 6, a rubber cylinder assembly 7, a spring seat 8, a spring 9. It is composed of guide head 10 and mandrel 11. A connecting neck 1 is sleeved on the outer wall of the cylindrical main body 2, and three slips 3 are suspended at the lower end of the connecting neck 1, and the inner wall of the lower end of the slips 3 is on the tapered slope of the main body 2.

There is a central hole at the lower end of the main body 2, and an annular valve seat 5 is fixed in the central hole of the main body 2, and a steel ball 4 is arranged on the top of the valve seat 5. There are four unloading holes evenly distributed on the side wall of the center hole of the main body 2; the position of the transverse hole is on the upper part of the steel ball 4; there are threads on the inner wall of the lower end of the center hole of the main body 2, and the lower end of the center hole of the main body 2 is threaded. A mandrel 11, the mandrel 11 is cylindrical and has a central hole, and an unloading hole is arranged at the upper end of the mandrel 11 wall; three rubber cartridge assemblies 7 are sheathed on the outer wall of the mandrel 11. The rubber cartridge assembly 7 is made up of a rubber bowl and a sleeve, and the rubber bowl is fixed on the outer wall of the sleeve. There are two O-shaped sealing rings 6 between each rubber cartridge assembly 7 and the mandrel 11 . In the lower part of the rubber cartridge assembly 7 and on the outer wall of the mandrel 11, a spring seat 8 is sheathed, and the spring seat 8 is circular; It is a cylindrical compression spring. At the bottom of the spring 9 and at the lower end of the outer wall of the mandrel 11, an annular guide head 10 is screwed. The guide head 10 presses the spring 9 so that the rubber cartridge assembly 7 is in close contact with the lower end surface of the main body 2 .

Briefly describe the use process of the anti-top self-unloading drainage tool. See Figure 1. Connect the liquid lifting tool string before use. The order of tools from top to bottom is: rope cap + weight bar + jar + connection tool + anti-top self-unloading and draining tool. The working process is completed in three steps: taking liquid and lifting, unloading and anti-topping.

1. Liquid extraction and lifting: During operation, the anti-top self-unloading liquid discharge tool is slowly lowered above the position of the restrictor with a well test steel wire. During the process of the tool from entering the liquid level to the position of the restrictor, due to the impact of the liquid on the steel Due to the resistance of the ball 4, there is a gap between the steel ball 4 and the valve seat 5, and the liquid in the wellbore enters from the center hole of the mandrel 11, passes through the gap between the steel ball 4 and the valve seat 5 and the liquid passage hole of the main body 2, and reaches the tool and the well The wall gap is due to the seal between the rubber cartridge assembly 7 and the well wall, the spring 9 pushes the rubber cartridge assembly 7 upward through the spring seat 8 to completely cover the unloading hole of the mandrel 11, and the ○-shaped sealing ring 6 seals the rubber cartridge assembly 7 and the mandrel 11 , so as the tool goes deeper, the amount of liquid above the rubber cartridge assembly 7 increases; at this time, as the well test wire is lifted up and the wellhead needle valve is adjusted, the liquid above the rubber cartridge assembly 7 is lifted to the ground.

2. Unloading: During the upward lifting process, when the fluid pressure above the rubber cartridge assembly 7 exceeds the preset compression tension of the spring 9, the rubber cartridge assembly 7 compresses the spring 9 downward along with the spring seat 8, and at this time the rubber cartridge assembly 7 is relatively As the mandrel 11 moves downward, the unloading hole of the mandrel 11 is exposed and contacts the lifting liquid above the rubber cartridge assembly 7, and the liquid above the rubber cartridge assembly 7 flows into the wellbore through the unloading hole of the mandrel 11. When the rubber cartridge assembly 7 above When the effusion pressure is equal to the preset compression tension of the spring 9, the spring 9 makes the rubber cartridge assembly 7 completely cover the unloading hole of the mandrel 11 through the spring seat 8.

3. Anti-topping: During the upward lifting process, when the wellbore airflow increases intermittently and suddenly, and at the same time, the pressure difference between the upper and lower sides of the tool increases, the tool body 2 will be fastened, because the connecting neck 1, slip 3 and the main body 2 Relative movement, the connecting neck 1 and slips 3 still maintain the original lifting speed due to inertia, and the slips 3 are blocked by the cone surface of the main body 2 and supported on the well wall, so that the entire tool seat is sealed on the well wall to avoid The tool is put on the string quickly so that the well test steel wire is discounted, causing downhole accidents.

Claims (4)

1. the anti-top of going up mainly is made up of connection neck (1), main body (2), slips (3), steel ball (4), valve seat (5), packing element assembly (7), spring base (8), spring (9), guide head (10), mandrel (11) from off-load discharge opeing instrument; Be with one and connect neck (1) on the outer wall of cylindrical bodily form main body (2), be hung with slips (3) in the lower end that connects neck (1), the lower end inwall of slips (3) is on the tapered slope of main body (2); It is characterized in that: there is centre bore the lower end in main body (2), is fixed with annular valve seat (5) in the centre bore of main body (2), on the top of valve seat (5) steel ball (4) is arranged; On the centre bore sidewall of main body (2), be evenly distributed with transverse holes; The position of transverse holes is on the top of steel ball (4); On the lower end inwall of main body (2) centre bore screw thread is arranged, main body (2) centre bore lower end screw thread is fixed with mandrel (11), and mandrel (11) has centre bore for the cylinder bodily form, and there is unloading hole mandrel (11) wall upper end; On the outer wall of mandrel (11), be with packing element assembly (7); In the bottom of packing element assembly (7) and be with spring base (8) on the outer wall of mandrel (11), spring base (8) is an annular; In the bottom of spring base (8) and on the outer wall of mandrel (11), be with spring (9); Be fixed with annular guide head (10) in the bottom of spring (9) and at the outer wall lower end of mandrel (11) screw thread; Guide head (10) holddown spring (9) makes packing element assembly (7) closely contact with main body (2) lower surface.

2. the anti-top of going up according to claim 1 is characterized in that: between packing element assembly (7) and mandrel (11) zero RunddichtringO (6) is arranged from off-load discharge opeing instrument.

3. the anti-top of going up according to claim 1 is from off-load discharge opeing instrument, and it is characterized in that: described packing element assembly (7) is made up of rubber bowl and sleeve, and the rubber bowl is fixed on the outer wall of sleeve.

4. the anti-top of going up according to claim 1 is characterized in that from off-load discharge opeing instrument: described spring (9) is the compression spring.

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