阅读说明：本技术 两步法无害资源化处理水基钻井废弃物的工艺 (Process for harmless recycling treatment of water-based drilling waste by two-step method ) 是由 邓苗 邓建雄 刘朋 谢宇风 黎小海 刘向彬 于 2021-09-08 设计创作，主要内容包括：本发明公开了一种无害资源化处理水基钻井废弃物的技术,首次将水基钻井废弃物应用在混凝土制品中。先利用破胶剂、氧化剂、固化剂和促凝剂将水基钻井废弃物中的有毒有害物质降解螯合固化,并将超细土颗粒团聚成粒径较大的颗粒；再将上述产物与水泥和砂石混合,利用增强剂的激发作用进一步激发超细土颗粒的活性,使其能与水泥和砂石匹配,制成性能良好的混凝土预制件。本发明创新地将水基钻井废弃物处理和资源化利用统一结合,节约资源,降低排放,减少污染。因此,本发明具有创新性以及很高的实际应用价值。(The invention discloses a technology for harmless recycling treatment of water-based drilling waste, which applies the water-based drilling waste to concrete products for the first time. Firstly, degrading, chelating and curing toxic and harmful substances in the water-based drilling waste by using a gel breaker, an oxidant, a curing agent and a coagulant, and agglomerating ultrafine soil particles into particles with larger particle size; and mixing the product with cement and sand stone, and further exciting the activity of the ultrafine soil particles by utilizing the excitation effect of the reinforcing agent so that the ultrafine soil particles can be matched with the cement and the sand stone to prepare the concrete prefabricated member with good performance. The invention creatively combines the water-based drilling waste treatment and resource utilization, saves resources, reduces emission and reduces pollution. Therefore, the invention has innovativeness and high practical application value.)

1. The process for harmless recycling treatment of water-based drilling waste by the two-step method is characterized by comprising the following two steps:

s1: and (4) performing harmless treatment on water-based drilling waste. The gel breaker, the oxidant, the curing agent and the coagulant are added into the water-based drilling waste to break the gel of the soil particles in the water-based drilling waste, so that the ultrafine particles are aggregated and harmful substances are rapidly cured, and the harmless treatment of the water-based drilling waste is achieved. Obtaining a primary treatment substance, and naturally airing or drying in the sun to obtain solid G1.

S2: and (5) resource utilization. Mixing cement, sand, stone and G1 according to a certain proportion, adding a proper amount of water, a coagulant and a reinforcing agent, uniformly stirring, filling into a mould for vibration molding, and then demoulding and maintaining to prepare the prefabricated member reaching the standard.

2. The two-step harmless resource treatment process for water-based drilling waste according to claim 1, which is characterized in that: breakers in step S1 include, but are not limited to, aluminum sulfate and ferrous chloride.

3. The two-step harmless resource treatment process for water-based drilling waste according to claim 1, which is characterized in that: the oxidizing agent in step S1 includes, but is not limited to, calcium hypochlorite, sodium persulfate, sodium percarbonate and the like.

4. The two-step harmless resource treatment process for water-based drilling waste according to claim 1, which is characterized in that: the curing agent in step S1 includes, but is not limited to, portland cement, aluminate cement, gypsum and lime, acrylic emulsion, epoxy resin, polyacrylamide, and the like.

5. The two-step harmless resource treatment process for water-based drilling waste according to claim 1, which is characterized in that: the coagulant in steps S1 and S2 includes but is not limited to aluminate, water glass, silicate, etc.

6. The two-step harmless resource treatment process for water-based drilling waste according to claim 1, which is characterized in that: the cement in the step S2 meets the general Portland cement (GB 175-2007).

7. The two-step harmless resource treatment process for water-based drilling waste according to claim 1, which is characterized in that: in the step S2, the sand and the stones meet the standard of quality and inspection method for the sand and the stones for common concrete (JGJ 52-2006).

8. The two-step harmless resource treatment process for water-based drilling waste according to claim 1, which is characterized in that: the grain size of G1 in step S2 is 1-10 mm.

9. The two-step process for efficiently recycling water-based drilling waste according to claim 1, wherein: the enhancing agent in step S2 includes, but is not limited to, calcium oxide, sodium hydroxide, aluminum sulfate, and the like.

Technical Field

The invention belongs to the technical field of harmless and recycling treatment of water-based drilling waste, and particularly relates to treatment of slurry (wastewater and ultrafine particles) in the water-based drilling waste and an application process of the slurry in concrete.

Background

During drilling, a large amount of water-based drilling waste, including drill cuttings and mud (waste water and ultra-fine particles), is generated, the amount of mud being about 3 times the volume drilled. In order to maintain the stability of the drilling well wall, a large amount of chemical agents are added into the drilling mud, so that the mud has high colloid rate and good stability, and is not easy to dehydrate and dry. After the drilling engineering is completed, a large amount of waste mud is left, which causes the problem of environmental pollution and needs to be treated on site, thus becoming a great problem. At present, the traditional pit digging and discharging method is still adopted for treating the drilling waste, the occupied area is large, and the surrounding ecological environment is seriously influenced. Therefore, the harmless and recycling treatment of the waste slurry becomes a problem to be solved urgently.

At present, the water-based mud is treated by solid-liquid separation and then step treatment at home, and the technical process is complicated, high in cost, long in period and capable of generating secondary pollution. The solid particles after solid-liquid separation are relatively small, the particle size is basically between several microns and dozens of microns, and the particles are called as ultrafine particles. In the prior art, solid phase is mostly treated and then buried or utilized, and direct resource utilization is not realized, wherein the main reason is that the particle size is too small to be added into various materials, such as concrete, firebrick, ceramic and the like. When the ultrafine particles are applied to concrete, the bonding between cement paste and sand is hindered due to the large specific surface area of the ultrafine particles, and the use amount of water and cement is increased under the condition of keeping the same fluidity, so that the strength and durability of the concrete are reduced, the concrete is shrunk by drying, creep is increased, and chromatography is generated in severe cases. Therefore, the prior art is difficult to directly utilize the ultrafine particles as resources.

At present, drilling waste is mainly treated by adopting stacking and solid-liquid separation technologies, but the process is complex, the occupied area is wide, the treatment cost is high, and the large-scale application is difficult. The prior treatment technology needs to treat a liquid phase and a solid phase after solid-liquid separation respectively, wherein the liquid phase needs further advanced treatment. Although the treatment method can make the slurry harmless, the step-by-step treatment is required, and secondary pollution is inevitably generated in the treatment process, so the prior art has the defects of more treatment steps, high resource consumption, secondary pollution and the like. Therefore, the invention provides a process for harmless recycling treatment of water-based drilling waste.

Disclosure of Invention

The invention aims to provide an integrated treatment method and application of water-based drilling waste. The treatment method provided by the invention treats the water-based drilling waste, harmlessly treats the wastewater and the ultrafine particles in the slurry and recycles the wastewater and the ultrafine particles, does not need solid-liquid separation, has simple treatment steps and low cost, and can utilize the harmlessly treated substances to manufacture the concrete prefabricated member.

In order to achieve the technical purpose, the invention adopts the following technical scheme:

the two-step harmless resource treatment process of water-based drilling waste comprises the following two steps,

s1: and (4) performing harmless treatment on water-based drilling waste. The water-based drilling waste is added with a gel breaker, an oxidant, a curing agent and a coagulant. The process breaks the slurry to agglomerate the superfine particles, reduces COD and quickly solidifies toxic and harmful substances, thereby achieving the harmless treatment of the water-based drilling waste. Air drying or sun drying the treated product, and crushing into 1-10mm to obtain solid G1.

A large amount of organic matters are added in the drilling process, so that the surface activity of soil particles in water-based drilling waste is increased, the self-destabilization difficulty is high, and a gel breaker needs to be added. The principle of the gel breaker is mainly to change the physical and chemical properties of drilling waste, destroy the colloid system on the surface of soil particles and promote the suspended fine particles to flocculate into larger floccules. The oxidant is added to oxidize and decompose organic matters in the drilling waste into small molecules by utilizing the oxidation effect so as to reduce COD. The curing agent is added to promote the soil particles in the drilling waste to be further connected together and fix toxic and harmful substances in the soil particles. The curing principle mainly utilizes the long chain of the macromolecule, the surface of which is provided with the long chain of the hydrophilic group, the hydrophilic group acts on the soil particles through hydrogen bonds and cation exchange to form a tight connection structure, the hydrophobic long chain on the main chain is wound on the surface of the soil particles and in the gaps to form a reticular membrane structure, toxic and harmful substances are further wound into the reticular structure to enhance the connection of the soil particles, and the soil particles and the toxic and harmful substances are cured into a whole by combining cementing materials such as cement and the like, thereby reducing the dispersion of fine soil particles and reducing COD. The coagulation accelerator is added to accelerate the solidification time of the drilling waste, and the mechanism is mainly that the addition of the coagulation accelerator causes a series of physical and chemical reactions, so that the mud structure is more compact, and the solidification time is shorter.

S2: and (5) resource utilization. Mixing cement, sand, stone and G1 according to a certain proportion, adding a proper amount of water, a reinforcing agent and a coagulant, uniformly stirring, filling into a mould for vibration molding, and then demoulding and maintaining to prepare the prefabricated member reaching the standard.

The reinforcing agent is added to increase the strength of the concrete, and can excite the activity of soil particles and react with cement to form a needle-shaped network structure so as to increase the strength.

In step S1, the gel breaker includes but is not limited to aluminum sulfate and ferrous chloride, and is added in an amount of 1% -8%.

In step S1, the oxidant includes but is not limited to calcium hypochlorite, sodium persulfate, sodium percarbonate and the like, and is added in an amount of 1-5%.

In the step S1, the curing agent includes but is not limited to portland cement, aluminate cement, gypsum, lime, etc. with the addition amount of 5-20%, and acrylic emulsion, epoxy resin and polyacrylamide with the addition amount of 1 per mill-1%.

The setting accelerators in steps S1 and S2 include but are not limited to aluminates, water glass, silicates, etc., and are added in an amount of 1% -10%.

In the step S1, the water-based drilling waste is cured and then aired or dried to be hardened, the superfine particles are reduced, and the water-based drilling waste is crushed into small particles with the particle size of 1-10mm, so that the water-based drilling waste can be added into concrete without causing adverse reaction.

The enhancing agent in step S2 includes, but is not limited to, calcium oxide, sodium hydroxide, aluminum sulfate, and the like. The adding amount is 1 to 5 percent

In the step S2, the cement is general portland cement with the proportion of 10-30%.

In the step S2, the sand is common building sand, and the proportion is 0-10%.

In the step S2, the stones are ordinary stones for construction, and the proportion is 40-60%.

In the step S2, the proportion of G1 is 10-40%.

In the step S2, the water adding amount is 50-90% of the mass of the cement.

In the step S2, a hexagonal prism prefabricated part mould with the side length of 120mm and the depth of 30mm is adopted as the mould, before forming, a layer of release agent (mineral oil) is uniformly coated on the inner wall of the mould, the frequency of a vibration table is 45-55Hz, and the vibration time is 5-20 min.

Compared with the prior art, the invention has the beneficial technical effects that:

1. the invention adopts a two-step method to treat the water-based drilling waste efficiently and harmlessly for the first time, and does not need solid-liquid separation. Toxic and harmful substances in the slurry are degraded, chelated and adsorbed by means of gel breaking, oxidation, curing and gluing to form a stable cured body, and meanwhile, ultrafine particles can be agglomerated to increase the particle size. The invention has simple treatment process and low cost, reduces secondary pollution and belongs to the green and environment-friendly technology.

2. The invention applies the solidified water-based drilling waste to concrete products for the first time. The drilling waste is hardened by adopting a curing technology, and the strength of the concrete added with the water-based drilling waste is improved by utilizing the excitation effect of the reinforcing agent, so that the cured water-based drilling waste can be added into the concrete without causing adverse reaction. The invention has high practical application value.

Drawings

FIG. 1 is a photograph of drilling waste of the present invention after soaking in water for 28 days before and after solidification. (a) No curing, (b) and (c) curing.

FIG. 2 is a photograph of the embodiment of FIG. 2.

FIG. 3 is a photograph of the second embodiment of FIG. 2.

FIG. 4 is a process flow diagram of the present invention.

Detailed description of the preferred embodiments

The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto.

The invention is further described below with reference to the following examples:

as shown in fig. 4, the process for harmless recycling water-based drilling waste by the two-step method in this embodiment comprises the following steps,

example one

S1: and (4) performing harmless treatment on water-based drilling waste. 2000g of drilling waste is taken, 3 percent of aluminum sulfate, 10 percent of Portland cement, 1 thousandth of acrylic emulsion, 3 percent of sodium aluminate and 1 percent of sodium persulfate are added, stirred uniformly, poured out, naturally dried or dried in the sun and crushed to obtain 1kg of solid A.

S2: 1kg of Portland cement, 0.5kg of sand and solid A1kg are stirred uniformly, 1kg of water and 150g of sodium aluminate are added, 2.5kg of stones are added after stirring uniformly, 0.25kg of reinforcing agent calcium oxide is added, stirring uniformly is carried out, the mixture is poured into a mould and placed on a cement oscillator to be oscillated for 10 minutes for forming. And (5) demolding and maintaining after standing for 1 day, and measuring the compressive strength for 7 days, 14 days and 28 days.

Example two

S1: and (4) performing harmless treatment on water-based drilling waste. 4000g of drilling waste is taken, 1.5 percent of aluminum sulfate and 0.5 percent of ferrous chloride, 6 percent of Portland cement and 1 percent of lime are added, 1 percent of gypsum, 5 thousandths of acrylic emulsion and 5 percent of sodium aluminate are added, stirred uniformly and then poured out to be naturally dried or dried in the sun, and crushed to obtain 2kg of solid B.

S2: 1.25kg of Portland cement and 1.5kg of solid B are uniformly stirred, 1.25kg of water and 100g of sodium aluminate are added, 2.25kg of stone and 0.15kg of sodium hydroxide are added after uniform stirring, the mixture is uniformly stirred, poured into a mould and placed on a cement oscillator to be vibrated for 10 minutes for forming. And (5) demolding and maintaining after standing for 1 day, and measuring the compressive strength for 7 days, 14 days and 28 days.

Comparative example

The formula of the comparative example is as follows: 1kg of Portland cement, 1.5kg of sand, 2.5kg of stones, 150g of sodium aluminate and 0.6kg of water, and the other steps are the same as [0033 ].

The formulation for curing the water-based drilling waste of the first and second examples and the formulation for making the concrete precast member of the first, second and comparative examples are shown in the following table 1-1.

TABLE 1-1 curing formulation and concrete ratio

The strength of the concrete preforms produced in examples one and two are shown in tables 1-2.

Tables 1-2 compressive Strength of case one and case two

In summary, the embodiment of the invention can harmlessly treat the water-based drilling waste in the water-based drilling waste treatment process and apply the water-based drilling waste to the concrete product for the first time. Compared with the existing water-based drilling waste treatment technology, the method not only can rapidly carry out harmless treatment on the water-based drilling waste, but also can utilize the treated product to manufacture the concrete prefabricated member, has simple process, saves the cost, reduces the secondary pollution, and is green and environment-friendly.

While the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that variations may be made in the embodiments without departing from the spirit of the invention, and such variations are to be considered within the scope of the invention.