CN112010413A - Gel breaking treatment method and cyclic utilization method of drilling waste liquid and gel breaker - Google Patents
Gel breaking treatment method and cyclic utilization method of drilling waste liquid and gel breaker Download PDFInfo
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- 239000007788 liquid Substances 0.000 title claims abstract description 147
- 239000002699 waste material Substances 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 62
- 125000004122 cyclic group Chemical group 0.000 title abstract description 6
- 239000012530 fluid Substances 0.000 claims abstract description 113
- 238000004064 recycling Methods 0.000 claims abstract description 25
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
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- 239000000084 colloidal system Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
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- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 239000004117 Lignosulphonate Substances 0.000 description 1
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- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a gel breaker, a gel breaking treatment method of drilling waste liquid and a cyclic utilization method of the drilling waste liquid. The gel breaker can be prepared from CaO, PAC, and FeSO4The composition and the combination proportion are selected according to the type of the drilling fluid system corresponding to the treated drilling waste liquid. The treatment method can comprise the step of carrying out gel breaking treatment on the drilling waste liquid by adopting the gel breaker. The recycling method can comprise the step of carrying out gel breaking treatment on the drilling waste liquid by adopting the gel breaking treatment method to obtain the blending liquid. And mixing the back-mixed liquid with the mud material to obtain the base slurry of the drilling fluid. The beneficial effects of the invention can include: can effectively improve the treatment efficiency of the drilling waste liquid, save water resources and reduce the drilling timeThe well waste liquid treatment cost and the use cost of the drilling fluid can solve the problem of drilling waste liquid pollution, and an important method and an important approach can be provided for green drilling.
Description
Technical Field
The invention relates to the technical field of drilling waste liquid treatment, in particular to waste liquid treatment of a drilling operation site by using polymer drilling fluid, polysulfonate drilling fluid and potassium-polysulfonate drilling fluid as circulating media.
Background
In recent years, petroleum and natural gas are used as important energy and strategic resources, and play a vital role in the rapid development of economy in China. Shale gas has become a global exploitation focus as a low-carbon and clean energy source. China has abundant shale gas resources, and with increasing mining intensity, while improving the energy supply mode, environmental problems such as water resource consumption, large environmental risk, land destruction and the like are caused due to energy input and resource consumption in the drilling operation process.
The drilling waste liquid is one of representative wastes in the drilling process, has large production amount, complex components and high treatment cost, and is a stable colloidal system with high chroma, high mineralization, oil content and solid suspension. The drilling waste liquid is mainly generated in the petroleum and natural gas exploration and drilling process, and the main sources of the drilling waste liquid are liquid phase in drilling waste, waste drilling fluid, sewage and rainwater collected in a sewage collection pit at the periphery of well site equipment facilities and the like.
The drilling waste liquid contains organic treating agents such as humic acids, tannins, lignosulphonates, celluloses, green-making agents, polymers, surfactants and the like besides fine clay suspended particles, heavy metal ions, oil, sulfides and inorganic salts. The drilling waste liquid and the waste mud are collected and stored in a waste water tank in a clean production area, and soil and water pollution can be caused by leakage, overflow and the like caused by improper storage, poor container sealing performance and the like. The drilling waste liquid also has the risks of supervision, environmental hazard, public health safety and the like in the transportation process.
The treatment method of the drilling waste liquid is mainly divided into physical method, chemical method, biological method, physical and chemical method and the like according to the principle. The main process includes pre-treatment, first-stage treatment and second-stage (deep) treatment. The pretreatment mainly comprises oil removal, acidification neutralization and the like; the first-stage treatment mainly comprises coagulating sedimentation, air floatation, electric air floatation and the like; the secondary (deep) treatment mainly comprises catalytic oxidation, micro-electrolysis, biological treatment, adsorption, membrane treatment and the like.
At present, although various treatment technologies of drilling waste liquid are mature, and the treatment effect also reaches a quite high standard, the waste liquid is generally collected in a unified way on a drilling operation site, and the waste liquid is treated indiscriminately according to the receiving standard of a local sewage plant, so that the treatment cost is high. The treated drilling waste liquid is transported to a local sewage plant for advanced treatment, the reuse rate is low, and the requirement of 'resource' treatment is not met.
Disclosure of Invention
In view of the deficiencies in the prior art, it is an object of the present invention to address one or more of the problems in the prior art as set forth above. For example, one of the objects of the present invention is to realize the recycling of drilling waste liquid in a drilling operation site.
In order to achieve the purpose, the invention provides a drilling waste liquid recycling method, a drilling waste liquid gel breaking treatment method and a gel breaker.
The invention provides a method for recycling drilling waste liquid.
The method may comprise the steps of: according to the type of a drilling fluid system, carrying out gel breaking treatment on the generated drilling waste liquid to obtain a blending liquid; mixing the back-mixed liquid with a slurry material to obtain base slurry of the drilling fluid; wherein, for a polymer drilling fluid system, the gel breaking treatment comprises: well drilling waste liquid and a first gel breaker are uniformly mixed, wherein the first gel breaker comprises CaO and PAC, and the proportion relation among the well drilling waste liquid, the CaO and the PAC is as follows: 150m3: (0.05-0.12) g: (0.3-0.7) g; for a polysulfonate drilling fluid system or a potassium-polysulfonate drilling fluid system, the gel breaking treatment comprises the following steps: mixing the drilling waste liquid and a second gel breaker uniformly, wherein the second gel breaker comprises CaO and FeSO4And PAC, drilling waste liquid, CaO, FeSO4And the PAC is in a proportional relationship: 150m3：(0.1～0.18)g：(0.1～0.18)g：(0.05～0.08)g。
According to one or more exemplary embodiments of the drilling waste recycling method of the present invention, the method may further include the steps of: after the return fluid is obtained, detecting whether the return fluid meets the preset requirement, and mixing the return fluid with a mud material under the condition that the preset requirement is met, wherein the polymer drilling fluid system is pre-mixedThe requirements are determined to comprise: the hardness of the back-mixed liquid is less than or equal to 1.00g/L, Al3+The content is less than or equal to 4.80g/L, Fe3+The content is less than or equal to 0.20g/L, and the pH value is 7-10; for the polysulfonate drilling fluid system, predetermined requirements include: the hardness of the reconstituted liquid is less than or equal to 3.35g/L, and Al3+Content is less than or equal to 10g/L, Fe3+The content is less than or equal to 2.8g/L, SO4 2-The content is less than or equal to 20.00g/L, and the pH value is 7-10; for the potassium-polysulfonate drilling fluid system, predetermined requirements include: the hardness of the back-mixed liquid is less than or equal to 96g/L, and Al3+Content is less than or equal to 1.85g/L, Fe3+The content is less than or equal to 1.65g/L, SO4 2-The content is less than or equal to 50.00g/L, and the pH value is 7-10.
According to one or more exemplary embodiments of the drilling waste fluid recycling method of the present invention, for the polysulfonate drilling fluid system, the second breaker may include a first breaker and a second breaker, wherein the first breaker and the second breaker are in a mass ratio of 0.1-0.18: 0.1-0.15: 0.05-0.08 of CaO and FeSO4And a PAC.
According to one or more exemplary embodiments of the drilling waste fluid recycling method, the gel breaker may include, for the potassium-polysulfonate drilling fluid system, a mixture of at least 0.13 to 0.18: 0.15 to 0.18: 0.06-0.08 of CaO and FeSO4And a PAC.
According to one or more exemplary embodiments of the drilling waste recycling method of the present invention, the method may further include the steps of: the drilling fluid base slurry is mixed with a second mud material to formulate a drilling fluid.
According to one or more exemplary embodiments of the method for recycling drilling fluid waste, for the polymer drilling fluid system, after the well drilling fluid waste is uniformly mixed with the first gel breaker, the gel breaking treatment further comprises: standing; for the polysulfonate drilling fluid system or the potassium-polysulfonate drilling fluid system, after the drilling waste liquid and the second gel breaker are uniformly mixed, the gel breaking treatment further comprises the following steps: and (5) standing.
The invention also provides a gel breaking treatment method of the drilling waste liquid.
The method may comprise the steps of: performing gel breaking on the generated drilling waste liquid according to the type of the drilling fluid systemAnd obtaining a back-up fluid which can be used for preparing the drilling fluid, wherein the gel breaking treatment comprises the following steps of: well drilling waste liquid and a first gel breaker are uniformly mixed, wherein the first gel breaker comprises CaO and PAC, and the proportion relation among the well drilling waste liquid, the CaO and the PAC is as follows: 150m3: (0.05-0.12) g: (0.3-0.7) g; for a polysulfonate drilling fluid system or a potassium-polysulfonate drilling fluid system, the gel breaking treatment comprises: mixing the drilling waste liquid and a second gel breaker uniformly, wherein the second gel breaker comprises CaO and FeSO4And PAC, drilling waste liquid, CaO, FeSO4And the PAC is in a proportional relationship: 150m3：(0.1～0.18)g：(0.1～0.18)g：(0.05～0.08)g。
According to an exemplary embodiment of the method for gel breaking treatment of drilling waste liquid, the hardness of the reconstituted liquid is less than or equal to 1.00g/L and Al is less than or equal to 1.00g/L for the polymer drilling fluid system3+The content is less than or equal to 4.80g/L, Fe3+The content is less than or equal to 0.20g/L, and the pH value is 7-10; for the polysulfonate drilling fluid system, the hardness of the back matching liquid is less than or equal to 3.35g/L, and Al3+Content is less than or equal to 10g/L, Fe3+The content is less than or equal to 2.8g/L, SO4 2-The content is less than or equal to 20.00g/L, and the pH value is 7-10; for the potassium-polysulfonate drilling fluid system, the hardness of the back-mixed liquid is less than or equal to 96g/L, and Al3+Content is less than or equal to 1.85g/L, Fe3+The content is less than or equal to 1.65g/L, SO4 2-The content is less than or equal to 50.00g/L, and the pH value is 7-10.
In another aspect, the invention provides a gel breaker for recycling drilling waste liquid. The gel breaker is suitable for drilling waste liquid corresponding to a polymer drilling fluid system, and can comprise the following components in a mass ratio of 0.05-0.12: 0.3 to 0.7 of CaO and PAC.
The invention also provides a gel breaker for recycling drilling waste liquid. The gel breaker is suitable for drilling waste liquid corresponding to a polysulfonate drilling fluid system or a potassium-polysulfonate drilling fluid system, and comprises the following components in a mass ratio of 0.1-0.18: 0.1 to 0.18: 0.05-0.08 of CaO and FeSO4And a PAC.
Compared with the prior art, the beneficial effects of the invention can include: the method is simple and convenient, can solve the technical problem and blank of the cyclic utilization of the drilling waste liquid in the drilling operation field, and can reduce the treatment cost of the drilling waste liquid and the use cost of the drilling fluid.
Detailed Description
Hereinafter, the gel breaker, the gel breaking treatment method of drilling waste liquid, and the drilling waste liquid recycling method of the present invention will be described in detail with reference to the exemplary embodiments.
The invention specifically pretreats the drilling waste liquid by formulating the control index of the cyclic utilization of the drilling waste liquid, thereby solving the problem of pollution of the drilling waste liquid, reducing the cost of the drilling waste liquid treatment and the use of the drilling fluid and providing an important method and approach for green drilling.
The invention provides a gel breaker for recycling drilling waste liquid.
The gel breaker can be prepared from CaO, PAC and FeSO4The composition and the combination proportion are selected according to the treated drilling waste liquid, and the gel breaker can be divided into a first gel breaker and a second gel breaker according to the type of the drilling waste liquid corresponding to a drilling fluid system.
The first gel breaker corresponds to drilling waste liquid generated by a polymer drilling fluid system, and the first gel breaker can comprise the following components in a mass ratio of 0.05-0.12: CaO and PAC of 0.3 to 0.7, for example (0.08. + -. 0.02): (0.5. + -. 0.15).
The second gel breaker corresponds to drilling waste liquid generated by a polysulfonate drilling fluid system or a potassium-polysulfonate drilling fluid system, and the second gel breaker can comprise the components in mass ratio of 0.1-0.18: 0.1 to 0.18: 0.05-0.08 of CaO and FeSO4And a PAC.
Further, for the drilling waste liquid generated by the polysulfonate drilling fluid system, the second gel breaker can comprise the components in a mass ratio of 0.1-0.18: 0.1-0.15: 0.05-0.08 of CaO and FeSO4And PAC, e.g., (0.14 ± 0.02): (0.13 ± 0.01): (0.065. + -. 0.01).
Further, for drilling waste liquid generated by the potassium-polysulfonate drilling fluid system, the second gel breaker can comprise the components in a mass ratio of 0.13-0.18: 0.15 to 0.18: 0.06-0.08 of CaO and FeSO4And PAC, e.g., (0.15 ± 0.01): (0.165 ± 0.01): (0.07. + -. 0.005).
The invention also provides a gel breaking treatment method of the drilling waste liquid. The treatment method can comprise the step of carrying out gel breaking treatment on the drilling waste liquid by adopting the gel breaker.
Wherein, for polymer drilling fluid systems, the gel breaking treatment may comprise: well drilling waste liquid and a first gel breaker are uniformly mixed, wherein the proportion relation among the well drilling waste liquid, CaO and PAC is as follows: 150m3：(0.05～0.12)g：(0.3～0.7)g。
For a polysulfonate drilling fluid system or a potassium-polysulfonate drilling fluid system, the gel breaking treatment comprises: mixing the drilling waste liquid and a second gel breaker uniformly, wherein the drilling waste liquid, CaO and FeSO4And the PAC is in a proportional relationship: 150m3：(0.1～0.18)g：(0.1～0.18)g：(0.05～0.08)g。
In another aspect, the invention provides a method for recycling drilling waste liquid.
In one exemplary embodiment of the drilling waste recycling method of the present invention, the method may include:
the drilling waste liquid gel breaking treatment method is adopted to carry out gel breaking treatment on the drilling waste liquid, and the blending liquid is obtained.
And mixing the back-mixed liquid with the mud material to obtain the base slurry of the drilling fluid.
In another exemplary embodiment of the method for recycling drilling waste liquid, after the drilling waste liquid is subjected to gel breaking treatment and the treated waste liquid is detected to meet the receiving index of the prepared drilling liquid, the drilling waste liquid can be used as clear water to prepare the base slurry of the drilling liquid, and then a slurry material is added to prepare the drilling liquid.
In particular, the method may comprise the steps of:
(1) on-site collection and treatment: and classifying and collecting the drilling waste liquid according to the type of the corresponding drilling fluid, and standing. Wherein the drilling waste fluid comprises waste drilling fluid, and the drilling fluid system generates drilling waste fluid in the drilling waste. Types of drilling fluids include polymer drilling fluids, polysulfonate drilling fluids, and potassium-polysulfonate drilling fluids.
(2) Adding a gel breaker into the waste liquid obtained in the step (1) in proportion, stirring and standing to obtain a waste liquid A; wherein, after the gel is broken, the particle substances in the gel liquid can be wrapped and gathered, and the standing purpose is to make the particle substances precipitate by using gravity, so as to achieve the effect of removing the particle substances.
(3) And (3) performance detection: and (3) detecting main indexes of the drilling waste liquid A obtained in the step (2) to ensure that the receiving indexes of the prepared drilling fluid are met.
(4) Preparing the drilling fluid: and (4) adding a slurry material into the wastewater A obtained in the step (3) to prepare a base slurry of the drilling fluid, and adding the slurry material to prepare the drilling fluid.
In the embodiment, in the step (2), the gel breaker is prepared from CaO, PAC and FeSO4The composition and the ratio of the combination are preferably selected according to the treated drilling waste liquid. Wherein, CaO is dissolved in water to generate calcium hydroxide, and releases a large amount of heat, thereby improving the pH value of the solution and being beneficial to reducing the colloid aggregation resistance. At the same time, due to Ca2+The positive charge can play the roles of neutralizing negative charges and compressing an electric double layer, can reduce repulsive force among colloids, and is favorable for aggregation, enlargement and sedimentation of colloid particles.
In this embodiment, in the drilling operation, different drilling fluid systems are usually adopted as the drilling medium due to different formations, working conditions, and the like, so the drilling process may include a plurality of stages (i.e., different drilling stages), each stage being a period of time in which a certain drilling fluid system is adopted as the drilling medium.
Preferably, in the drilling waste liquid in the step (2), in the stage of adopting a polymer drilling fluid system, the adding proportion of the gel breaker is that the drilling waste liquid: CaO: PAC (the name of Chinese is polyaluminium chloride) ═ 150m3：(0.05～0.12)g：(0.3～0.7)g。
Preferably, in the drilling waste liquid in the step (2), in the stage of adopting a polysulfonate drilling fluid system, the adding proportion of the gel breaker is that the drilling waste liquid: CaO: FeSO4：PAC＝150m3：(0.10～0.18)g：(0.10～0.15)g：(0.05～0.08)g。
Preferably, the drilling waste liquid in the step (2) is obtained by mixing the drilling waste, CaO: FeSO4：PAC＝150m3：(0.13～0.18)g：(0.15～0.18)g：(0.06～0.08)g。
In this embodiment, the receiving index of the drilling waste liquid a in the step (3) is detected according to different drilling fluid systems.
And (3) when the waste liquid A is used for preparing a polymer drilling fluid system, the main receiving indexes are as follows: hardness less than or equal to 1.00g/L, Al3+≤4.80g/L，Fe3+≤0.20g/L，pH＝7～10。
More preferably, when the waste liquid a in the step (3) is used for preparing a polysulfonate drilling fluid system, the main receiving indexes are as follows: hardness less than or equal to 3.35g/L, Al3+≤10.00g/L，Fe3+≤2.80g/L，SO4 2-≤20.00g/L，pH＝7～10；
More preferably, when the waste liquid a in the step (3) is used for preparing a potassium-polysulfonate drilling fluid, the main receiving indexes are as follows: hardness not more than 96.00g/L, Al3+≤1.85g/L，Fe3+≤1.65g/L，SO4 2-≤50.00g/L，pH＝7～10。
And for the drilling waste liquid A which does not meet the receiving index in the field application process, a certain amount of clear water can be added for dilution or further treatment, so that the drilling waste liquid A meets the receiving index and is recycled.
In this embodiment, the polymer drilling fluid prepared from the drilling waste liquid corresponding to the polymer drilling fluid of the present invention can satisfy the following indexes: the funnel viscosity is 35 to 45s, e.g. 38s, API water loss ≦ 5mL, e.g. 4mL, mud cake ≦ 0.5mm, e.g. 0.3mm, pH 8 to 9, e.g. 8.5, initial shear of 1 to 3, e.g. 2, final shear of 2 to 6, e.g. 5, plastic viscosity 5 to 18 mPas, e.g. 10 mPas, dynamic shear of 2 to 6Pa, e.g. 4.
The performance of the polysulfonate drilling fluid prepared from drilling waste liquid corresponding to the polysulfonate drilling fluid can meet the following indexes: the funnel viscosity is 40 to 50s, e.g. 43s, API water loss ≦ 5mL, e.g. 3mL, mud cake ≦ 0.5mm, e.g. 0.4mm, pH 9 to 10, e.g. 9.5, sand content ≦ 0.5%, e.g. 0.4%, static shear initial cut 1 to 4, e.g. 3, final cut 2 to 8, e.g. 6, plastic viscosity 5 to 16 mPas, e.g. 6 mPas, dynamic shear 1 to 5Pa, e.g. 1.5.
The performance of the potassium-polysulfonate drilling fluid prepared from drilling waste liquid corresponding to the potassium-polysulfonate drilling fluid can meet the following indexes: the funnel viscosity is 35 to 50s, e.g. 38s, API water loss ≦ 5mL, e.g. 3mL, mud cake ≦ 0.5mm, e.g. 0.4mm, pH 9 to 10, e.g. 9.7, sand content ≦ 0.3%, e.g. 0.25%, static shear initial cut 1 to 3, e.g. 2, final cut 2 to 7, e.g. 6, plastic viscosity 6 to 20 mPas, e.g. 8 mPas, dynamic shear 2 to 6Pa, e.g. 2.5.
In the embodiment, the drilling waste liquid A can be used as the alternative of clear water for preparing the drilling fluid, and the related drilling fluid preparation scheme can be executed according to the drilling design.
In still another exemplary embodiment of the drilling waste recycling method of the present invention, the method may include the steps of:
the drilling waste liquid collected on the drilling site is uniformly collected to the sewage collecting tanks in the clean production area according to the drilling waste liquid generated by different drilling fluid systems, and the drilling waste liquid generated by different drilling fluid systems is placed in different sewage collecting tanks. Adding CaO-PAC-FeSO according to different drilling fluid systems in proportion4Performing combined gel breaking, stirring, and standing after treatment. And taking the supernatant to carry out main receiving index detection, and if the main receiving index meets the indexes, using the supernatant to prepare a drilling fluid system.
In summary, the advantages of the gel breaker, the gel breaking treatment method of drilling waste liquid and the drilling waste liquid recycling method of the invention include at least one of the following:
(1) can effectively improve the treatment efficiency of the drilling waste liquid and save water resources.
(2) The technical problem and the blank of the cyclic utilization of the drilling waste liquid in the drilling operation field can be solved, and the treatment cost of the drilling waste liquid and the use cost of the drilling fluid are reduced.
(3) The process flow of gel breaking treatment can be shortened, the investment of people, machines and materials in the deep treatment process is reduced, and the treatment cost and the energy consumption are saved.
(4) Can solve the pollution problem of the drilling waste liquid, and can provide an important method and a way for green drilling.
Although the present invention has been described above in connection with exemplary embodiments, it will be apparent to those skilled in the art that various modifications and changes may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for recycling drilling waste liquid is characterized by comprising the following steps:
according to the type of a drilling fluid system, carrying out gel breaking treatment on the generated drilling waste liquid to obtain a blending liquid;
mixing the back-mixed liquid with a slurry material to obtain base slurry of the drilling fluid;
wherein, for a polymer drilling fluid system, the gel breaking treatment comprises: well drilling waste liquid and a first gel breaker are uniformly mixed, wherein the first gel breaker comprises CaO and PAC, and the proportion relation among the well drilling waste liquid, the CaO and the PAC is as follows: 150m3：(0.05～0.12)g：(0.3～0.7)g；
For a polysulfonate drilling fluid system or a potassium-polysulfonate drilling fluid system, the gel breaking treatment comprises: mixing the drilling waste liquid and a second gel breaker uniformly, wherein the second gel breaker comprises CaO and FeSO4And PAC, drilling waste liquid, CaO, FeSO4And the PAC is in a proportional relationship: 150m3：(0.1～0.18)g：(0.1～0.18)g：(0.05～0.08)g。
2. The drilling waste recycling method of claim 1, further comprising the steps of: after the return liquid is obtained, detecting whether the return liquid meets a preset requirement, and mixing the return liquid with a slurry material under the condition that the preset requirement is met, wherein,
for the polymer drilling fluid system, predetermined requirements include: the hardness of the back-mixed liquid is less than or equal to 1.00g/L, Al3+The content is less than or equal to 4.80g/L, Fe3+The content is less than or equal to 0.20g/L, and the pH value is 7-10;
for the polysulfonate drilling fluid system, predetermined requirements include: the returnHardness of the liquid is less than or equal to 3.35g/L, Al3+Content is less than or equal to 10g/L, Fe3+The content is less than or equal to 2.8g/L, SO4 2-The content is less than or equal to 20.00g/L, and the pH value is 7-10;
for the potassium-polysulfonate drilling fluid system, predetermined requirements include: the hardness of the back-mixed liquid is less than or equal to 96g/L, and Al3+Content is less than or equal to 1.85g/L, Fe3+The content is less than or equal to 1.65g/L, SO4 2-The content is less than or equal to 50.00g/L, and the pH value is 7-10.
3. The drilling waste liquid recycling method of claim 1, wherein for the polysulfonate drilling fluid system, the second gel breaker comprises the following components in a mass ratio of 0.1-0.18: 0.1-0.15: 0.05-0.08 of CaO and FeSO4And a PAC.
4. The method for recycling drilling waste liquid as claimed in claim 1, wherein the gel breaker comprises the following components in a mass ratio of 0.13-0.18: 0.15 to 0.18: 0.06-0.08 of CaO and FeSO4And a PAC.
5. The drilling waste recycling method of claim 1, further comprising the steps of: the drilling fluid base slurry is mixed with a second mud material to formulate a drilling fluid.
6. The method of claim 1, wherein the breaking process further comprises, for the polymer drilling fluid system, after the mixing the drilling waste with the first breaker uniformly: standing;
for the polysulfonate drilling fluid system or the potassium-polysulfonate drilling fluid system, after the drilling waste liquid and the second gel breaker are uniformly mixed, the gel breaking treatment further comprises the following steps: and (5) standing.
7. A gel breaking treatment method of drilling waste liquid is characterized by comprising the following steps:
according to the type of the drilling fluid system, the produced drilling waste liquid is subjected to gel breaking treatment to obtain a back-blending liquid which can be used for preparing the drilling fluid, wherein,
for polymer drilling fluid systems, the gel breaking treatment comprises: well drilling waste liquid and a first gel breaker are uniformly mixed, wherein the first gel breaker comprises CaO and PAC, and the proportion relation among the well drilling waste liquid, the CaO and the PAC is as follows: 150m3：(0.05～0.12)g：(0.3～0.7)g；
For a polysulfonate drilling fluid system or a potassium-polysulfonate drilling fluid system, the gel breaking treatment comprises: mixing the drilling waste liquid and a second gel breaker uniformly, wherein the second gel breaker comprises CaO and FeSO4And PAC, drilling waste liquid, CaO, FeSO4And the PAC is in a proportional relationship: 150m3：(0.1～0.18)g：(0.1～0.18)g：(0.05～0.08)g。
8. The method of claim 7, wherein the hardness of the reconstituted fluid is less than or equal to 1.00g/L and Al is present in the polymer drilling fluid system3+The content is less than or equal to 4.80g/L, Fe3+The content is less than or equal to 0.20g/L, and the pH value is 7-10;
for the polysulfonate drilling fluid system, the hardness of the back matching liquid is less than or equal to 3.35g/L, and Al3+Content is less than or equal to 10g/L, Fe3+The content is less than or equal to 2.8g/L, SO4 2-The content is less than or equal to 20.00g/L, and the pH value is 7-10;
for the potassium-polysulfonate drilling fluid system, the hardness of the back-mixed liquid is less than or equal to 96g/L, and Al3+Content is less than or equal to 1.85g/L, Fe3+The content is less than or equal to 1.65g/L, SO4 2-The content is less than or equal to 50.00g/L, and the pH value is 7-10.
9. The gel breaker for recycling the drilling waste liquid is characterized by being suitable for the drilling waste liquid corresponding to a polymer drilling fluid system and comprising the following components in a mass ratio of 0.05-0.12: 0.3 to 0.7 of CaO and PAC.
10. The gel breaker for recycling drilling waste liquid is characterized by comprising the gel breakerThe drilling fluid is suitable for drilling waste liquid corresponding to a polysulfonate drilling fluid system or a potassium-polysulfonate drilling fluid system, and comprises the following components in a mass ratio of 0.1-0.18: 0.1 to 0.18: 0.05-0.08 of CaO and FeSO4And a PAC.
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