阅读说明：本技术 一种泡沫钻井液产生装置 (Foam drilling fluid produces device ) 是由 李东元 罗平亚 游艳平 张群双 蔡为立 张雅博 李涪芳 于 2019-09-20 设计创作，主要内容包括：本发明涉及一种泡沫钻井液产生装置。泡沫钻井液产生装置具体包括泡沫产生装置和泡沫混合装置,泡沫产生装置的发泡腔室中设置有带有螺旋搅拌叶片的搅拌杆,泡沫产生装置连接有增压系统以保证发泡腔室内部处于高压状态。混合装置包括混合腔室和混合杆,混合杆空心结构,混合杆上设置有螺旋叶片和搅拌叶片,螺旋叶片之间设计有泡沫出口小孔。泡沫从泡沫产生装置的泡沫出口经过混合装置混合杆上的泡沫出口小孔逐渐进入混合腔室,与钻井液均匀混合。相比现有技术,本发明中产生的钻井液泡沫发泡倍数高、泡沫形状均匀、在井下稳定性好、且与钻井液基液混合效果较好。(The invention relates to a foam drilling fluid generating device. The foam drilling fluid generating device specifically comprises a foam generating device and a foam mixing device, a stirring rod with spiral stirring blades is arranged in a foaming cavity of the foam generating device, and the foam generating device is connected with a pressurization system to ensure that the interior of the foaming cavity is in a high-pressure state. Mixing arrangement includes mixing chamber and mixing rod, mixing rod hollow structure is provided with helical blade and stirring vane on the mixing rod, and the design has the foam outlet aperture between the helical blade. The foam gradually enters the mixing chamber from the foam outlet of the foam generating device through the foam outlet small holes on the mixing rod of the mixing device and is uniformly mixed with the drilling fluid. Compared with the prior art, the drilling fluid produced by the invention has the advantages of high foam expansion, uniform foam shape, good stability in the underground and better mixing effect with the drilling fluid base fluid.)

1. A foam drilling fluid generating device is characterized by comprising a foam generating device and a mixing device;

the foam generating device is of a cylindrical structure and is provided with two inlets and an outlet, wherein the two inlets are respectively a liquid inlet and a gas inlet, and the outlet is a foam outlet; the liquid inlet and the gas inlet are both connected with a pressurization system, the liquid inlet and the gas inlet are in a contraction cone shape, and the liquid inlet and the gas inlet are arranged adjacently at the end part of the inlet of the cylindrical structure; the foam generating device is provided with a foaming cavity, a stirring rod is arranged in the foaming cavity, and stirring blades are arranged on the stirring rod; the foam generating device is connected with the pressurization system;

mixing arrangement is including mixing chamber and mixing arm, mixing chamber is hollow cylinder structure, mixing arm is hollow structure, mixing arm one end is the entry of foam, and the other end is the plug structure, be provided with helical blade and stirring vane on the mixing arm, equidistant design has the foam outlet aperture between the helical blade on the mixing arm, the foam outlet intercommunication mixing arm of foam production device, the foam gets into mixing chamber gradually through the foam outlet aperture on the mixing arm, and well drilling base fluid passes through well drilling base fluid entry entering mixing chamber, and foam and well drilling base fluid produce through helical blade and stirring vane's effect in mixing chamber and mix, and mixing arrangement connects the turbocharging system.

2. The foam drilling fluid generation device of claim 1, wherein the foam generation device further comprises a constant diameter chamber and a diffusion chamber; after entering the foam generating device, the pressurized gas and the pressurized liquid sequentially pass through the constant-diameter chamber, the diffusion chamber and the foaming chamber.

3. The foam drilling fluid generating device according to claim 1, wherein the stirring blade is a helical stirring blade.

4. The foam drilling fluid generation device of claim 3, wherein the helical mixing blades are distributed with circular small holes.

5. The foam drilling fluid generation device of claim 1, wherein a temperature system is further connected to the foam generation device.

6. The apparatus of claim 1, wherein a motor is connected to the stirring rod, the motor driving the stirring rod to rotate.

7. The foam drilling fluid generation device of claim 1, wherein the foam outlet of the foam generation device is provided with a filter screen which is of a cylindrical structure, and circular filter holes are distributed on the filter screen.

Technical Field

The invention relates to the field of petroleum exploration and development drilling engineering, in particular to a foam drilling fluid generating device.

Background

In the drilling engineering, the foam drilling fluid is a gas-liquid-solid three-phase system, and because of the existence of foam in the foam drilling fluid, the viscosity, the dynamic and static shearing force and the rock carrying capacity of the foam drilling fluid are higher than those of water-based drilling fluid. Meanwhile, compared with water-based drilling fluid, the foam drilling fluid also has the characteristics of low hydrostatic column pressure and small loss, so that the foam drilling fluid is widely applied to exploration and development of low-pressure fractured oil-gas reservoirs, heavy oil reservoirs, low-pressure and low-permeability oil-gas layers, oil-gas reservoirs with serious loss and oil reservoirs with energy depletion.

In the foam drilling fluid, uniform foam with good stability and high foaming multiple needs to be generated, so that the foam can adapt to the underground high-temperature and high-pressure environment. In addition, when the foam and the drilling fluid are mixed, the foam is easy to break and has poor stability in the mixing process because the physical properties such as density and the like between the foam and the drilling fluid are greatly different. However, the existing foam drilling fluid generation device cannot meet the above requirements, and therefore, a foam drilling fluid generation device capable of solving the above problems is needed.

Disclosure of Invention

In order to achieve the aim, the invention provides a device for generating foam drilling fluid, which adopts the following technical scheme:

a foam drilling fluid generating device comprises a foam generating device and a mixing device;

the foam generating device is of a cylindrical structure and is provided with two inlets and an outlet, wherein the two inlets are respectively a liquid inlet and a gas inlet, and the outlet is a foam outlet; the liquid inlet and the gas inlet are both connected with a pressurization system, the liquid inlet and the gas inlet are in a contraction cone shape, and the liquid inlet and the gas inlet are arranged adjacently at the end part of the inlet of the cylindrical structure; the foam generating device is provided with a foaming chamber, and a stirring rod is arranged in the foaming chamber. The stirring rod is provided with stirring blades; the foam generating device is connected with a pressurization system, and the pressurization system is used for ensuring that the interior of the foaming chamber is in a high-pressure state;

mixing arrangement is including mixing chamber and mixing arm, mixing chamber is hollow cylinder structure, mixing arm is hollow structure, mixing arm one end is the entry of foam, and the other end is the plug structure, be provided with helical blade and stirring vane on the mixing arm, equidistant design has the foam export aperture between the helical blade on the mixing arm, the foam export intercommunication mixing arm of foam production device, the foam gets into mixing chamber gradually through the foam export aperture on the mixing arm, and well drilling base fluid passes through well drilling base fluid entry entering mixing chamber, and foam and well drilling base fluid produce through helical blade and stirring vane's effect in mixing chamber and mix, and mixing arrangement also is connected with the turbocharging system.

Optionally, the foam generating device further comprises a constant diameter chamber and a diffusion chamber;

after entering the foam generating device, the pressurized gas and the pressurized liquid sequentially pass through the constant-diameter chamber, the diffusion chamber and the foaming chamber.

Optionally, the stirring blade is a helical stirring blade.

Optionally, circular small holes are distributed on the spiral stirring blade.

Optionally, the foam generating device is further connected with a temperature system.

Optionally, a motor is connected to the stirring rod, and the motor drives the stirring rod to rotate.

Optionally, the foam outlet of the foam generating device is provided with a filter screen, the filter screen is of a cylindrical structure, and circular filter holes are distributed in the filter screen.

The invention has the beneficial effects that:

(1) the foam is generated in a foam generating device under the condition of simulating the temperature and the pressure of the stratum, so that the formed foam is foam with internal pressure. Thereby overcoming the defect that the foam is easy to break because the temperature and pressure difference between the environment generating the foam on the ground and the underground environment is large in the prior art.

(2) According to the foam generating device, the liquid inlet and the gas inlet are arranged adjacently, so that the mixing effect of the pressurized gas and the pressurized liquid is better, and the foaming times are improved; on the other hand, set up the helical mixing paddle piece that has the round hole in the puddler among the foam produces the device, helical mixing paddle piece can increase the mixed effect of gas and liquid, and the round hole is favorable to improving into bubble efficiency.

(3) In order to guarantee the uniformity and the stability of the foam, a filter screen is arranged at the position of a foam outlet, and the diameter of the foam can be adjusted by a filter screen mesh, so that the uniformity of the foam shape passing through the filter screen mesh can be guaranteed, and the stability of the whole foam is further guaranteed.

(4) The foam is gradually added in the mixing device through the hollow spiral stirring shaft, so that the generated foam and the base fluid of the drilling fluid are uniformly mixed, and the defect of poor foam stability in the mixing process is overcome.

Drawings

FIG. 1 is a schematic view of the structure of a foam-generating apparatus according to the present invention;

FIG. 2 is a schematic structural view of a foam mixing apparatus of the present invention;

wherein, 1, a foam generating device; 2. a liquid inlet; 3. a gas inlet; 4. a foam outlet; 5. a constant diameter chamber; 6. a diffusion chamber; 7. a foaming chamber; 8. a stirring rod; 9. a helical mixing blade; 10. filtering with a screen; 11. a mixing device; 12. a mixing chamber; 13. a mixing rod; 14. an inlet end of the mixing chamber; 15. a mixing chamber outlet end; 16. a helical blade; 17. a foam outlet orifice; 18. a stirring blade; 19. a drilling base fluid inlet; 20. and a foam drilling fluid outlet.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely means consistent with certain aspects of the invention, as detailed in the following claims.

A foam drilling fluid generating device comprises a foam generating device 1 and a mixing device 11.

The foam generating device 1 is used for generating foam, and the mixing device 11 is used for mixing the base fluid of the drilling fluid and the foam generated by the foam generating device 1 to obtain the foam drilling fluid.

The foam-generating device 1 is of a cylindrical configuration having two inlets, respectively a liquid inlet 2 and a gas inlet 3, and one outlet, a foam outlet 4. Wherein, the liquid inlet 2 and the gas inlet 3 are both connected with a pressurizing system, and the liquid inlet 2 and the gas inlet 3 are in a contracting cone shape. Liquid inlet 2 and gas inlet 3 are adjacent setting at tubular structure entry tip, and this kind of mode of setting can guarantee to take pressure gas and area to press liquid to get into foaming chamber 7 with the direction of parallel to make and take pressure gas and area to press liquid can the intensive mixing in the chamber, improve the liquid and form the membrane parcel and live the efficiency of pressing gas, can improve the foaming multiple promptly. After entering the foam generating device 1, the pressurized gas and the pressurized liquid sequentially pass through the constant diameter chamber 5, the diffusion chamber 6 and the foaming chamber 7, and the stirring rod 8 is arranged in the foaming chamber 7. The stirring rod 8 is also provided with a spiral stirring blade 18, and round small holes are distributed on the spiral stirring blade 18. The liquid and the gas generate turbulence and foam under the action of the stirring rod 8. The disturbance effect of the helical stirring blades 18 increases the probability of mixing, collision and extrusion between the pressurized gas and the pressurized liquid.

The foam generating device 1 is connected with a pressurization system and a temperature system, wherein the pressurization system is used for ensuring that the interior of the chamber is in a high-pressure state, so that the environment for forming foam is a high-pressure environment, the formed foam is foam with pressure in an inner cavity, and the stability of the foam in a shaft under the pressure condition of the shaft can be ensured. The temperature system is used for ensuring that the foam generating environment is a high-temperature environment, so that the generated foam has better adaptability in the well.

The pressurizing system provides pressure for gas, liquid and the chamber, pressurized gas and liquid enter the foam generating device 1, and the gas inlet 3 and the liquid inlet 2 are arranged oppositely to ensure that the pressurized gas can enter the liquid in the tangential direction. Under the action of the stirring rod 8, the gas and the liquid are selected and fully mixed, so that the liquid is promoted to form a film to wrap the gas under pressure.

It should be noted that, in order to ensure that the pressurized gas and the pressurized liquid are sufficiently mixed in the chamber and provide sufficient kinetic energy for the gas and the liquid, it should be ensured that the inlet pressure of the gas and the liquid is greater than the pressure inside the chamber when the gas and the liquid enter the chamber from the inlet, and the process of the gas and the liquid entering the chamber from the inlet is a decompression volume expansion process.

It should be noted that, in the design and test of the present invention, the inventors found that the influence of the pressure on the foam stability is larger and the influence of the temperature on the foam stability is smaller than the influence of the temperature and the pressure on the foam. Therefore, when the foam generating device is designed, only the pressurization system can be arranged, and the temperature system can be selectively arranged.

The stirring rod 8 in the foam generating device 1 is connected with a motor, and the motor drives the stirring rod 8 to rotate in the cylinder body.

The foam outlet 4 of the foam generating device 1 is provided with a filter screen 10, the filter screen 10 is of a cylindrical structure, and circular filter holes in the filter screen 10 can screen and shape the foam passing through the filter screen 10, so that the uniformity of the generated foam is ensured.

The stirring rod 8 is provided with a spiral stirring blade 18, and the spiral stirring blade 18 is provided with a small hole, and the size of the small hole can be adjusted according to the size of required foam.

The foam-generating device 1 further comprises a mixing device 11. The foam generated by the foam generating means 1 passes through the post-outlet foam mixing means 11. Likewise, in order to maintain the stability of the foam, the mixing device 11 is also connected to a pressurization system, so that the foam does not collapse in the mixing device due to the expansion of the bubbles caused by the pressure difference.

The mixing device 11 comprises a mixing chamber 12 and a mixing rod 13, wherein the mixing chamber 12 is of a hollow cylindrical structure, the mixing rod 13 is of a hollow structure, one end of the mixing rod 13 is an inlet of foam, and the other end of the mixing rod 13 is of a plug structure. The mixing rod 13 is provided with a helical blade 16 and a stirring blade 18.

The helical blades 16 on the mixing rod 13 are designed with foam outlet apertures 17 at equal distances. The foam outlet 4 of the foam-generating device 1 communicates with the mixing rod 13, and the foam gradually enters the mixing chamber 12 through the foam outlet orifice 17 of the hollow mixing rod 13. Meanwhile, the drilling base fluid enters the mixing chamber 12 through the drilling base fluid inlet 19, and the foam and the drilling base fluid are mixed in the mixing chamber 12 under the action of the helical blades 16 and the stirring blades 18, so that the drilling fluid and the foam are fully mixed. The stirring blade 18 may be a double helical blade with staggered windings.

When the mixing rod 13 rotates, the thrust of the helical blades 16 on the drilling base fluid can be decomposed into radial and axial acting forces, the radial acting force causes the drilling base fluid to turn upwards, and the axial acting force pushes the drilling fluid in the horizontal axial direction. The drilling base fluid can form a complex motion track, the motion track of the drilling base fluid becomes more complex due to the shearing action of the helical blades 16 on the drilling base fluid, so that strong convection and shearing mixing actions are generated, the turbulence degree of the drilling base fluid is enhanced, the omnibearing dead-angle-free deep mixing is realized, and the drilling base fluid and the foam are quickly and uniformly mixed in a short time.

In summary, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can propose other embodiments within the technical teaching of the present invention, but the embodiments are included in the scope of the present invention.