CN205032471U - A individual well layering is extracted and injection device for contaminated site recovering work - Google Patents

Abstract

The utility model relates to a single-well layered extraction and injection device used in a polluted site restoration project, comprising an extraction/injection well system, an extraction/injection dropper system and a layered pneumatic sealing system. The screen of the extraction/injection well system encompasses the entire target remediation zone. The extraction/injection dropper system is connected to an external extraction or injection system, and the dropper position can be adjusted up and down. The upper and lower pneumatic sealing rings in the layered pneumatic sealing system are set on both sides of the triangular cutout of the extraction dropper, and the position and distance can be adjusted. In the inflated state, the upper and lower pneumatic sealing rings expand and cling to the wall of the well pipe, so that the airtightness between the upper and lower pneumatic sealing rings is maintained, and vacuum extraction and positive pressure injection can be performed in this area. Real-time switching between extraction wells and injection wells can be realized. In addition, by adjusting the position of the dropper and the position and interval of the upper and lower pneumatic sealing rings, the target repair layer can be adjusted to overcome the adverse effects of soil heterogeneity and reduce repair costs. and improve repair efficiency.

Description

A Single Well Layered Extraction and Injection Device for Contaminated Site Restoration Project

technical field

The technology of the utility model is a set of devices which can be applied to the restoration project of the polluted site and can realize the functions of layered extraction and injection of a single well.

Background technique

Extraction wells and injection wells are widely used in most of the in-situ remediation technologies of contaminated sites, such as bio-ventilation technology in in-situ soil bioremediation, using injection wells to ventilate and supply contaminated soil with oxygen to promote aerobic microorganisms in the soil Degradation of pollutants; soil gas extraction technology in in-situ soil physical and chemical remediation, using extraction wells to apply vacuum to the contaminated area, driving soil gas entrained pollutants to flow to the extraction wells, and finally treated on the ground; in-situ groundwater bioremediation The artificially enhanced bioremediation technology uses injection wells to inject air, nutrients, and electron acceptors into polluted groundwater to enhance the speed of microbial degradation of pollutants to achieve the purpose of remediation; multiphase extraction technology in in-situ groundwater physical and chemical remediation, Use extraction wells to apply vacuum to the contaminated area, and simultaneously extract soil gas and contaminated groundwater and non-aqueous fluids to remediate contaminated soil and groundwater; chemical oxidation technology in in-situ groundwater physical and chemical remediation, using injection wells to inject groundwater A strong oxidant is added to decompose or transform pollutants in groundwater through oxidation-reduction reactions to form environmentally harmless compounds to achieve the purpose of remediation. In short, injection wells and extraction wells are the main pathways for the removal of pollutants, and also the main means for exogenous remediation materials to enter contaminated areas, and are widely used in various remediation technologies.

The current extraction wells and injection wells have the following technical limitations in the use of various repair technologies: 1) The target repair horizons of injection wells and extraction wells are mainly the parts covered by screens. Traditional extraction wells and injection wells Once the position and length of the screen is determined, it cannot be adjusted after it is installed underground, that is, the target repair layer cannot be adjusted; Target remediation layers of the same soil type may also have preferential pathways of large pores such as soil cracks, root channels, and wormholes. The nearby polluted area will be repaired first, and the repair effect of the polluted area with a small permeability coefficient and other than the priority channel is limited, or even completely impossible to repair. 3) Some sites use extraction wells and injection wells at the same time. Traditional injection wells and extraction wells are designed and installed according to site characteristic parameters. It is impossible to ensure that one well meets the technical requirements of injection and extraction at the same time, and it is impossible to realize both extraction and extraction in a single well and injected functions.

At present, there are no patent publications on extraction wells and injection well devices that can solve the above technical limitations in China. The breakthrough of the above technical limitations is of great significance for saving the cost of the remediation project of contaminated sites and improving the remediation efficiency.

Contents of the invention

The technology of the utility model overcomes the limitations of the prior art that cannot adjust the repair target layer, cannot overcome the uneven soil layer, and cannot realize the real-time switching of the extraction and injection functions, and provides a single-well delamination that can be applied to the restoration project of the contaminated site. Equipment for extraction and injection.

The utility model technology is realized through the following technical solutions:

A set of devices used in contaminated site remediation projects that can realize single-well layered extraction and injection functions, including extraction/injection well system, extraction/injection dropper system and layered pneumatic sealing system.

The extraction/injection well system includes a quick joint at the lower end (without a union end), a white pipe, a screen pipe, a bottom cover, cement slurry, bentonite and quartz sand. The quick connector at the lower end (without the reel end) has an external thread and is connected to the upper end of the white pipe. The lower end of the white tube is connected to the upper end of the screen tube, and the lower end of the screen tube is equipped with a bottom cover. The space between the outer wall of the well pipe and the installation soil hole is filled with quartz sand, bentonite and cement slurry in sequence from bottom to top.

The extraction/injection dropper system includes a transparent high-pressure hose, a ball valve, a pressure vacuum gauge, a three-hole top cover, a quick connector on the upper end (with a ream end), a dropper and a triangular cutout on the lower part of the dropper. Both ends of the transparent high-pressure hose are inserted into the dropper and fixed by stainless steel hoops. The three-hole top cover is distributed with 3 small holes of different diameters, which are respectively the outlets of 2 compressed air pipes and 1 dropper. The lower part of the three-hole top cover is the upper quick connector (with ream end), which is matched with the lower end quick connector (without ream end) of the extraction/injection well system, which can be quickly connected and disassembled. The top angle of the triangular cut at the lower part of the dropper is 120°, and the span of the top angle cut is 13mm. The depth of the dropper inserted into the extraction/injection well is determined according to the characteristic parameters of the site, and the upper part passes through the three-hole top cover and is connected to the external vacuum extraction or injection system.

The layered pneumatic sealing system includes a compressed air pipe, an upper pneumatic sealing ring and a lower pneumatic sealing ring. The compressed air pipe and the upper and lower end pneumatic sealing rings are connected through a pneumatic quick connection. The upper and lower end pneumatic sealing rings are both sleeved on the dropper, respectively located at the upper and lower ends of the triangular cutout of the dropper, separated by a certain distance, and supplied by a compressed air pipe connected to an external compressed air source. The upper and lower pneumatic sealing rings are ring-shaped hollow structures, made of acid, alkali and high pressure resistant silicone, fixed on the dropper through the stainless steel quick clamps on the upper and lower sides, and the position can be adjusted according to needs. In the inflated state, the upper and lower pneumatic sealing rings expand to the periphery, and the outer wall is close to the inner wall of the extraction/injection well pipe, ensuring a good seal between the outer wall of the sealing ring and the inner wall of the well pipe during extraction and injection.

Preferably, the outer diameter of the upper and lower pneumatic sealing rings sleeved on the dropper in the uninflated state is smaller than the inner diameter of the extraction/injection well, so that the position of the dropper in the well can be flexibly adjusted.

Preferably, the upper and lower pneumatic sealing rings are connected to an external compressed air source through a compressed air tube, and can expand and cling to the wall of the well pipe in an inflated state, so that the airtightness between the upper and lower pneumatic sealing rings can be maintained, and vacuum pumping can be carried out for this area Elevate and inject with positive pressure.

The triangular incision set at the lower part of the dropper has a vertex angle of 120° and a notch span of 13mm, which can effectively avoid the violent shaking caused by the frequent fluctuation of the groundwater level at the incision position during the vacuum extraction process of the traditional flat-mouthed dropper, making the system The operation is more stable.

Preferably, the dropper behind the ball valve is connected to a 30cm long transparent high-pressure hose, so that the internal fluid state of the dropper can be observed in real time.

Preferably, the sieve of the extraction/injection well system screen is 0.02mm, the distance between the sieves is 3mm, and the length of the screen covers the entire target repair layer, and the target layer or layered injection can be adjusted later as required.

Preferably, single-well layered extraction and injection can be realized by adjusting the position of the dropper and the position and spacing of the upper and lower pneumatic sealing rings.

When in use, first install the upper and lower pneumatic sealing rings in the layered pneumatic sealing system at the designated position of the dropper, then insert the extraction/injection dropper system into the extraction/injection well to the specified depth and tighten the upper and lower quick connectors, and then open ball valve. Then open the external compressed air source, so that the upper and lower pneumatic sealing rings expand to ensure the airtightness of the space between the upper and lower pneumatic sealing rings. Cooperating with external extraction or injection system, single well layered injection or extraction can be realized.

Compared with the current prior art, the utility model technology has the following advantages:

(1): By adjusting the position of the dropper and the interval between the upper and lower pneumatic sealing rings, the target repair layer can be adjusted in real time, thereby optimizing the repair process and improving repair efficiency. However, the target repair horizon of traditional extraction/injection wells is determined by the length and position of the screen, which cannot be adjusted in real time once installed.

(2): By adjusting the position of the dropper and the interval between the upper and lower pneumatic sealing rings, the target repair layer can be divided into several small interval layers for layered repair, so as to overcome the uneven soil when repairing the entire target repair layer. The repair caused by quality is uneven and incomplete.

(3): By adjusting the position of the dropper and the distance between the upper and lower pneumatic sealing rings, the real-time switching of single well extraction and injection functions can be realized. However, traditional injection wells and extraction wells are designed and installed according to the characteristic parameters of the site, which cannot ensure that one well meets the technical requirements of injection and extraction at the same time, and cannot realize the functions of both extraction and injection in a single well.

Description of drawings

Fig.1 Schematic diagram of single-well layered extraction and injection device

Fig. 2 Schematic diagram of the gas-filled state structure of the single-well layered extraction and injection device

Figure 3 Schematic diagram of the cross-sectional structure of the pneumatic sealing ring

detailed description

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figures 1 to 3, the technology of this utility model is a set of devices that can realize the functions of single-well layered extraction and injection, which are applied to the restoration project of contaminated sites, including extraction/injection well system, extraction/injection drip Tube system and layered pneumatic sealing system.

The extraction/injection well system includes a quick connector at the lower end (without a ream end) (1), a white pipe (2), a screen (3), a bottom cover (4), cement slurry (5), bentonite (6 ) and quartz sand (7). The quick connector at the lower end (without the threaded end) (1) has an external thread and is connected to the upper end of the white pipe (2). The lower end of the white pipe (2) is connected to the upper end of the screen pipe (3), and the lower end of the screen pipe (3) is equipped with a bottom cover (4). The pipes and joints mentioned above are all made of De63 UPVC. The screen pipe (3) sieve gap width is 0.2 mm, and the screen gap spacing is 3 mm. The space between the outer wall of the well pipe and the installation soil hole is sequentially filled with quartz sand (7), bentonite (6) and cement slurry (5) from bottom to top. The length of the extraction/injection well screen (3) of the utility model needs to cover the entire target repair layer, so as to realize layered extraction and injection as required during the repair process.

Extraction/injection dropper system includes transparent high-pressure hose (8), ball valve (9), pressure vacuum gauge (10), three-hole top cover (11), upper quick connector (with reel end) (12), dropper Triangular cutout (14) on the lower part of the tube (13) and dropper. The transparent high-pressure hose (8) of PVC material is 30cm in length, and the dropper (13) of De25UPVC material is inserted in both ends, and is fixed by stainless steel hoop. Ball valve (9) is the UPVC material of De25 specification. The range of the pressure vacuum gauge (10) is -0.1 to 1.5Mpa, and both meet the range requirements during vacuum extraction and positive pressure injection. Three-hole top cover (11) is the UPVC material of De63 specification, is distributed with 2 diameters 6mm and 1 diameter and is the aperture of 25mm, is respectively 2 compressed air pipes (15) and dropper outlet. The lower part of the three-hole top cover (11) is a De63 specification UPVC upper quick connector (with a ream end) (12), with a female thread, and the lower end quick connector of the extraction/injection well system (without a ream end) ( 1) Matching, can be quickly connected and disassembled. The triangular notch (14) apex angle of dropper bottom is 120 °, and the span of apex angle incision is 13mm. The depth of the dropper (13) inserted into the extraction/injection well is determined according to the characteristic parameters of the site, and the upper part passes through the three-hole roof (11) and is connected to the external vacuum extraction or injection system.

The layered pneumatic sealing system mainly includes a compressed air pipe (15), an upper pneumatic sealing ring (16) and a lower pneumatic sealing ring (17). Compressed air pipe (15) is PU6mm*4mm specification, and upper and lower end pneumatic sealing rings (16,17) are connected by pneumatic fast connection. The upper and lower end pneumatic sealing rings (16, 17) are all enclosed within the dropper (13), and are positioned at the upper and lower ends of the dropper triangular otch (14) respectively, with a certain distance apart. The compressed air pipe (15) of the upper pneumatic sealing ring (16) comes out from the inflation port (18), extends along the outer wall of the dropper (13), and goes out from the three-hole top cover (11), and then connects to the external compressed air source; the compressed air pipe (15) of the lower end pneumatic sealing ring (17) extends along the inner wall of the dropper (13), passes through the position of the upper end pneumatic sealing ring (16), and goes out from the wall of the dropper (13), and then Pass through the three-hole top cover (11) along the outer wall of the dropper (13) and connect to an external compressed air source. The perforation position of the dropper (13) wall is sealed with sealing silica gel to ensure airtightness. The upper and lower end pneumatic sealing rings (16, 17) are annular hollow structures, made of acid, alkali and high pressure resistant silica gel, fixed on the dropper (13) by the stainless steel quick clamps (19) on the upper and lower sides of the ring, and as required Adjust the position. Under the non-inflated state, the inner diameter of the pneumatic sealing ring (16, 17) is 25mm, the outer diameter is 45mm, and the height is 16mm. In the inflated state, the upper and lower pneumatic sealing rings (16, 17) expand to the periphery, and the outer wall is close to the inner wall of the extraction/injection well pipe, ensuring good airtightness between the outer wall of the sealing ring and the inner wall of the well pipe during extraction and injection. The inflation port (18) of the upper pneumatic sealing ring (16) is installed vertically on the top of the sealing ring, while the inflation port (18) of the lower pneumatic sealing ring (17) is installed horizontally on the cylinder between the sealing ring and the dropper (13). The cut surface extends inwards and passes through the wall of the dropper (13), and then vertically upwards, with a shape similar to an "L" shape.

When performing extraction operation, the dropper (13) is connected to an external vacuum extraction system; when performing injection operation, the dropper (13) is connected to an external injection system. Before the extraction and injection operations, first determine the target repair horizon, adjust the depth of the dropper (13) inserted into the well and the interval between the upper and lower pneumatic sealing rings (16, 17) according to the repair horizon. In general, the interval between the upper and lower pneumatic sealing rings (16, 17) should include the repair target layer or be slightly larger than the repair target layer, and the triangular cutout (14) of the dropper is located between the upper and lower pneumatic sealing rings (16, 17). middle part. Simultaneously, the position of the dropper (13) and the interval of the upper and lower end pneumatic sealing rings (16, 17) can also be flexibly adjusted according to the site characteristics during the restoration engineering design.

Install the upper and lower pneumatic sealing rings (16, 17) in the layered pneumatic sealing system on the specified position of the dropper (13), then insert the extraction/injection dropper system into the extraction/injection well to the specified depth, and quickly insert the upper and lower ends into the extraction/injection well. The joints (12, 1) are tightened and the ball valve (9) is opened. Open the external compressed air source to make the upper and lower pneumatic sealing rings (16, 17) expand, and the outer wall of the sealing ring is close to the inner wall of the extraction/injection well pipe. Within the working pressure range of -0.1Mpa to 0.3Mpa, the layered pneumatic sealing system can maintain good airtightness and meet the requirements for extraction and injection pressure in various restoration technologies.

During the implementation of remediation engineering, it is often necessary to adjust process parameters, such as the target remediation horizons of extraction and injection wells. However, the target repair horizon of traditional extraction and injection wells is determined by the length and position of the screen, which cannot be adjusted in real time once installed. The technology of the utility model can adjust the target repair layer in real time by adjusting the position of the dropper (13) and the distance between the upper and lower pneumatic sealing rings (16, 17), thereby optimizing the repair process and improving the repair efficiency.

When the soil layer types in the target remediation layer are different and there are preferential channels, the remediation effect of traditional extraction and injection wells will mainly focus on the soil layer in the target layer with a higher permeability coefficient and preferential channel areas, because When extracting the underground polluted medium and injecting remediation agent in the soil layer in the large and preferential channel area, the resistance to be overcome is small; while the remediation effect has a remedial effect on the soil layer with a small permeability coefficient in the target remediation layer and the remediation area outside the priority channel Limited, or even no repair effect at all. The utility model can divide the target repair layer into several small intervals for repair by adjusting the position of the dropper (13) and the interval (16, 17) of the upper and lower pneumatic sealing rings, so that the soil layers in each small interval are relatively Uniformity, to overcome the adverse effects of soil heterogeneity.

A restoration project may use extraction wells and injection wells for restoration at the same time. Traditional injection wells and extraction wells are designed and installed according to site characteristic parameters. The target restoration layers of extraction wells and injection wells are often inconsistent, and it is impossible to achieve simultaneous consideration of a single well. Extraction and injection functions. The utility model can realize the real-time switching of single well extraction and injection functions by adjusting the position of the dropper (13) and the interval between the upper and lower end pneumatic sealing rings (16, 17).

Claims (6)

1. for individual well layering extracting and the injection device of contaminated site recovery project, it is characterized in that: device comprises extracting/injector well system, extracting/injection dropper system and layering pneumostop system,

Described extracting/injector well system comprises lower end snap joint (1), white pipe (2), screen casing (3), bottom (4), cement mortar (5), bentonite (6) and quartz sand (7), described lower end snap joint (1) the outer silk screw thread of band is also connected with described white pipe (2) upper end, described white pipe (2) lower end is connected with screen casing (3) upper end, screen casing (3) lower end is furnished with bottom (4), well casing outer wall and to install between native hole space filled stone sand (7) successively from bottom to up, bentonite (6) and cement mortar (5),

Extracting/injection dropper system comprises transparent high-pressure hose (8), ball valve (9), pressure vacuum meter (10), three hole top covers (11), upper end snap joint (12), three angle kerves (14) of dropper (13) and dropper bottom, transparent high-pressure hose (8) two ends are inserted in outside dropper, fixed by stainless steel anchor ear, three hole top covers (11) are for being distributed with the aperture of 3 different-diameters, be respectively 2 compressed air hoses (15) and dropper (13) outlet, three hole top cover (11) bottoms are upper end snap joint (12), band internal thread screw thread, supporting with the lower end snap joint (1) of extracting/injector well system, can connect fast and dismantle, three angle kerves (14) drift angle of dropper bottom is 120 °, three angle kerves (14) span is 13mm, dropper (13) is connected to external vacuum extracting or injecting systems through after three hole top covers (11) always,

Layering pneumostop system mainly comprises compressed air hose (15), upper end Pneumatic sealing ring (16) and lower end Pneumatic sealing ring (17), compressed air hose (15) and upper and lower side Pneumatic sealing ring (16, 17) connect in succession soon by pneumatic, upper and lower side Pneumatic sealing ring (16, 17) be all enclosed within dropper (13), lay respectively at the two ends up and down of dropper three angle kerve (14), keep at a certain distance away, by being connected to compression gas pipe (15) air feed of external compression air source of the gas, upper and lower side Pneumatic sealing ring (16, 17) annular hollow structure is, the high voltage bearing silica gel material of acid and alkali-resistance, be fixed on dropper (13) by the quick clip of the stainless steel of its upper and lower both sides (19), can adjusting position as required, under inflated condition, upper and lower side Pneumatic sealing ring (16, 17) expand to the periphery, outer wall is close to extracting/injector well inside pipe wall, guarantee that in extracting and injection process, sealing ring outer wall and well casing inner wall sealing are good.

2. according to claim 1 for individual well layering extracting and the injection device of contaminated site recovery project, it is characterized in that, unaerated state is enclosed within the pneumostop up and down (16 on dropper (13), 17) enclose external diameter and be less than extracting/injector well internal diameter, dropper (13) position in well can be adjusted flexibly.

3. according to claim 1 for individual well layering extracting and the injection device of contaminated site recovery project, it is characterized in that, upper and lower side Pneumatic sealing ring (16,17) external compression air source of the gas is connected to by compression gas pipe (15), can expand in the deflated condition and be close to well tubular wall, make to keep sealing between upper and lower side Pneumatic sealing ring (16,17), vacuum extraction and malleation injection can be carried out for this interval.

4. according to claim 1 for individual well layering extracting and the injection device of contaminated site recovery project, it is characterized in that, dropper (13) after ball valve (9) connects the long transparent high-pressure hose (8) of 30cm, can Real Time Observation dropper internal flow state.

5. according to claim 1 for individual well layering extracting and the injection device of contaminated site recovery project, it is characterized in that, the sieve seam of extracting/injector well system screen casing (3) is 0.02mm, sieve kerf spacing is 3mm, and screen casing (3) length covers whole target repair layer position, follow-up can as required adjustment aim layer position or layering injection.

6. according to claim 1 for individual well layering extracting and the injection device of contaminated site recovery project, it is characterized in that, can by adjustment dropper (13) position and upper and lower side Pneumatic sealing ring (16,17) mode at position and interval, realizes individual well layering extracting and injection.