CN111849430A - Preparation method of ultralow permeability agent for water-based drilling fluid - Google Patents
Preparation method of ultralow permeability agent for water-based drilling fluid Download PDFInfo
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- CN111849430A CN111849430A CN202010684897.XA CN202010684897A CN111849430A CN 111849430 A CN111849430 A CN 111849430A CN 202010684897 A CN202010684897 A CN 202010684897A CN 111849430 A CN111849430 A CN 111849430A
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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
- C09K8/03—Specific additives for general use in well-drilling compositions
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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
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
Abstract
The invention discloses a preparation method of an ultra-low permeability agent for water-based drilling fluid, which relates to the technical field of petroleum drilling and comprises the following steps: adding the unidirectional pressure sealing agent into a reactor, adding the low molecular polymer and the natural polymer, stirring and mixing, adding the superfine calcium carbonate, the resin, the modified asphalt and the mica, and stirring and mixing uniformly. The preparation method disclosed by the invention is simple and safe in process, stable in product quality and strong in plugging property.
Description
Technical Field
The invention relates to the technical field of petroleum drilling, in particular to a preparation method of an ultralow permeability agent for water-based drilling fluid.
Background
In the process of petroleum drilling, due to the complex stratum condition, when drilling a stratum with rich pore development, a large amount of drilling fluid permeates into the stratum to cause hydration expansion of the mud shale of the well wall, so that the well wall is unstable, and various downhole complications such as well wall collapse, drill sticking and the like occur. Therefore, an ultra-low permeability agent for water-based drilling fluid is needed at present, but the product produced by the prior art is unstable in quality and poor in plugging effect.
According to the ultra-low permeability agent for the water-based drilling fluid, through reasonable material types and particle size matching, when a pore stratum is drilled, the ultra-low permeability agent can effectively enter pores of the stratum, and a plug is formed at the pore throat of the pore, so that the pore is closed, and the drilling fluid is prevented from further permeating into the stratum. Because a certain amount of rigid materials such as superfine calcium carbonate and the like are added, the ultra-low permeability agent can improve the pressure bearing capacity of the well wall while entering pores of the well wall to form a plugging layer, and the stability of the well wall is facilitated.
Disclosure of Invention
In order to overcome the defects of related products in the prior art, the invention provides a preparation method of an ultralow permeability agent for water-based drilling fluid, and solves the problems of insufficient plugging property and low pressure bearing capacity in the prior art.
The invention provides a preparation method of an ultra-low permeability agent for water-based drilling fluid, which comprises the following steps:
(1) adding 50-70 parts by weight of a one-way pressure sealing agent into a reactor;
(2) adding 3-5 parts by weight of low molecular polymer into the reactor, and mixing and stirring for 30 min;
(3) adding 3-5 parts by weight of natural polymer into a reactor, and mixing and stirring for 30 min;
(4) adding 10-20 parts by weight of superfine calcium carbonate, mixing and stirring for 30 min;
(5) Adding 3-5 parts by weight of resin, mixing and stirring for 30 min;
(6) adding 20-40 parts by weight of asphalt, mixing and stirring for 30 min;
(7) adding 5-10 parts by weight of mica, mixing and stirring for 30 min;
(8) mixing, stirring, discharging, and packaging.
In some embodiments of the present invention, the reactor is a mixer, and the reactor is stirred and mixed at normal temperature and pressure.
In certain embodiments of the invention, the unidirectional pressure sealant in step (1) is bran cereal powder or sawdust powder.
In certain embodiments of the invention, the low molecular weight polymer is solid diluent XY-27.
In certain embodiments of the invention, the ultrafine calcium carbonate is 400 mesh: 600 meshes: 800 meshes: 1250 mesh is 1: 2: 2: 3.
In certain embodiments of the present invention, the resin is an acrylamide-based polymeric resin.
In certain embodiments of the invention, the asphalt is an oxidized asphalt.
In certain embodiments of the invention, the mica is a 40 mesh: 60 mesh-1: 3 mixture.
Compared with the prior art, the invention has the following advantages:
1. the selected one-way pressure sealing agent, superfine calcium carbonate, micromolecule solid diluent, resin, asphalt, natural polymer and mica material have reasonable material type collocation and scientific particle grading;
2. The production method of the product is safe and simple, and has no pollution and no by-product;
3. in the prior art, a plurality of materials are simply mixed, and the novel technology considers the interaction and collocation among various materials, so that the plugging capability of the plugging agent can be greatly improved;
4. the invention solves the problems of insufficient plugging capability of the commonly used plugging agent on site, collapse of well wall on site and the like;
5. the problem of serious drilling fluid viscosity increase caused by a common plugging agent on site is solved.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present disclosure is set forth in order to provide a more thorough understanding thereof. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Example 1
The added raw materials comprise the following components in Table 1: 1) adding 50 parts by weight of unidirectional pressure sealing agent into a reactor; 2) then adding the low molecular polymer with the weight portion of 4 into the reactor for mixing and stirring; 3) adding 5 parts by weight of natural polymer into a reactor, mixing and stirring; 4) adding 15 parts by weight of superfine calcium carbonate, mixing and stirring; 5) adding 3 parts by weight of resin into a reactor, mixing and stirring; 6) adding 20 parts by weight of asphalt into a reactor, and mixing and stirring; 7) adding 10 parts by weight of mica into a reactor, mixing and stirring; 8) after mixing and stirring evenly, discharging and bagging.
Example 2
The added raw materials comprise the following components in Table 1: 1) adding 70 parts by weight of unidirectional pressure sealing agent into a reactor; 2) then adding the low molecular polymer with the weight part of 5 into the reactor for mixing and stirring; 3) adding 3 parts by weight of natural polymer into a reactor, mixing and stirring; 4) adding 10 parts by weight of superfine calcium carbonate, mixing and stirring; 5) adding 5 parts by weight of resin into a reactor, mixing and stirring; 6) adding 40 parts by weight of asphalt into a reactor, and mixing and stirring; 7) adding mica with the weight part of 5 into a reactor, mixing and stirring; 8) after mixing and stirring evenly, discharging and bagging.
Example 3
The added raw materials comprise the following components in Table 1: 1) adding 60 parts by weight of unidirectional pressure sealing agent into a reactor; 2) then adding the low molecular polymer with the weight portion of 3 into the reactor for mixing and stirring; 3) adding 4 parts by weight of natural polymer into a reactor, mixing and stirring; 4) adding 10 parts by weight of superfine calcium carbonate, mixing and stirring; 5) adding 4 parts by weight of resin into a reactor, mixing and stirring; 6) adding 30 parts by weight of asphalt into a reactor, and mixing and stirring; 7) adding mica with the weight part of 5 into a reactor, mixing and stirring; 8) after mixing and stirring evenly, discharging and bagging.
Example 4
The added raw materials comprise the following components in Table 1: 1) adding 50 parts by weight of unidirectional pressure sealing agent into a reactor; 2) then adding the low molecular polymer with the weight part of 5 into the reactor for mixing and stirring; 3) adding 3 parts by weight of natural polymer into a reactor, mixing and stirring; 4) adding 20 parts by weight of superfine calcium carbonate, mixing and stirring; 5) adding 5 parts by weight of resin into a reactor, mixing and stirring; 6) adding 40 parts by weight of asphalt into a reactor, and mixing and stirring; 7) adding 8 parts by weight of mica into a reactor, mixing and stirring; 8) after mixing and stirring evenly, discharging and bagging.
Example 5
The added raw materials comprise the following components in Table 1: 1) adding 60 parts by weight of unidirectional pressure sealing agent into a reactor; 2) then adding the low molecular polymer with the weight portion of 4 into the reactor for mixing and stirring; 3) adding 4 parts by weight of natural polymer into a reactor, mixing and stirring; 4) adding 20 parts by weight of superfine calcium carbonate, mixing and stirring; 5) adding 3 parts by weight of resin into a reactor, mixing and stirring; 6) adding 30 parts by weight of asphalt into a reactor, and mixing and stirring; 7) adding 10 parts by weight of mica into a reactor, mixing and stirring; 8) after mixing and stirring evenly, discharging and bagging.
Example 6
The added raw materials comprise the following components in Table 1: 1) adding 70 parts by weight of unidirectional pressure sealing agent into a reactor; 2) then adding the low molecular polymer with the weight portion of 3 into the reactor for mixing and stirring; 3) adding 5 parts by weight of natural polymer into a reactor, mixing and stirring; 4) adding 15 parts by weight of superfine calcium carbonate, mixing and stirring; 5) adding 4 parts by weight of resin into a reactor, mixing and stirring; 6) adding 20 parts by weight of asphalt into a reactor, and mixing and stirring; 7) adding 8 parts by weight of mica into a reactor, mixing and stirring; 8) after mixing and stirring evenly, discharging and bagging.
TABLE 1 preparation of ultra-low permeant-free component content
The performance in a 6% loading slurry of several types of blocking agents commonly used on site was evaluated in an indoor comparison and the results are shown in table 2.
TABLE 2 comparison of the Properties of several blocking Agents
The plugging property evaluation is carried out according to the requirements of the standard Q/SYCQZ 686-2013 by respectively measuring the moisture content of each sample; the apparent viscosity is that 6 percent of bentonite-based slurry is prepared, after curing for 16h at 25 ℃, 4 percent of plugging agent samples are added, and after stirring at high speed for 20min at the rotating speed of 12000r/min, the apparent viscosity is measured; the sand bed invasion depth test comprises the steps of adding 600g of 20-40-mesh cleaned and dried river sand into a visible sand bed, compacting, adding a drilling fluid sample slurry with measured apparent viscosity, pressurizing to 0.69MPa, testing for 30min, measuring the invasion depth of the drilling fluid on the surface of the sand bed by using a scale, measuring 4 points, and taking the arithmetic mean value as an experimental value.
The bearing capacity is evaluated by a 71-type high-temperature high-pressure filtration loss instrument, 200g of river sand which is cleaned and dried by 20-40 meshes is poured on the surface of a filter screen of the instrument and is compacted, drilling fluid sample slurry with measured apparent viscosity is added, the pressure is increased to 0.69MPa firstly, the pressure is gradually increased after the pressure is maintained for 30min, and the experimental pressure at the moment is recorded until the drilling fluid flows out linearly from a lower valve rod, so that the maximum bearing capacity of the sample is obtained.
The preparation method of the ultralow permeability agent for the water-based drilling fluid comprises the following steps of using raw materials comprising a one-way pressure sealing agent, a low-molecular polymer, a natural polymer, superfine calcium carbonate, resin, oxidized asphalt and mica, wherein the quality of a plugging effect depends on the selection of material types and the grading of particle sizes, and when various types of materials are selected, the one-way pressure sealing agent is used as a main material and has a plugging effect on pores, so that a plugging layer can be quickly formed, and the filtration loss of the drilling fluid is reduced; the mica sheet is of a sheet structure, and can be covered and clamped on the surface of a larger pore, so that a large pore is changed into a small pore, and then other fine particle materials are further filled and blocked; rigid material superfine calcium carbonate with different meshes is selected, the material is hard and can not deform, and after the calcium carbonate enters the pores of the stratum, the pressure bearing capacity of the stratum can be effectively improved; the polymer and the like have a connecting effect and can strengthen the action effect among solid-phase particles; the resin is used as a deformable material and can enter the pores to expand, so that the pores are blocked more compactly; the selected asphalt also has the effects of reducing viscosity and water loss.
Those not described in detail in this specification are within the skill of the art. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments. All equivalents that can be substituted by the contents of the specification of the present invention and applied directly or indirectly to other related technical fields are within the scope of the present invention.
Claims (8)
1. A preparation method of an ultra-low permeability agent for water-based drilling fluid is characterized by comprising the following steps:
(1) adding 50-70 parts by weight of a one-way pressure sealing agent into a reactor;
(2) adding 3-5 parts by weight of low molecular polymer into the reactor, and mixing and stirring for 30 min;
(3) adding 3-5 parts by weight of natural polymer into a reactor, and mixing and stirring for 30 min;
(4) adding 10-20 parts by weight of superfine calcium carbonate, mixing and stirring for 30 min;
(5) adding 3-5 parts by weight of resin, mixing and stirring for 30 min;
(6) adding 20-40 parts by weight of asphalt, mixing and stirring for 30 min;
(7) adding 5-10 parts by weight of mica, mixing and stirring for 30 min;
(8) mixing, stirring, discharging, and packaging.
2. The preparation method of the ultra-low permeability agent for the water-based drilling fluid, which is characterized by comprising the following steps of: the reactor is a mixer, and the reactor is stirred and mixed at normal temperature and normal pressure.
3. The preparation method of the ultra-low permeability agent for the water-based drilling fluid, which is characterized by comprising the following steps of: the unidirectional pressure sealant in the step (1) is bran powder or saw powder.
4. The preparation method of the ultra-low permeability agent for the water-based drilling fluid, which is characterized by comprising the following steps of: the low molecular polymer is a solid diluent XY-27.
5. The preparation method of the ultra-low permeability agent for the water-based drilling fluid, which is characterized by comprising the following steps of: the superfine calcium carbonate is 400 meshes: 600 meshes: 800 meshes: 1250 mesh is 1: 2: 2: 3.
6. The preparation method of the ultra-low permeability agent for the water-based drilling fluid, which is characterized by comprising the following steps of: the resin is acrylamide polymer resin.
7. The preparation method of the ultra-low permeability agent for the water-based drilling fluid, which is characterized by comprising the following steps of: the asphalt is oxidized asphalt.
8. The preparation method of the ultra-low permeability agent for the water-based drilling fluid, which is characterized by comprising the following steps of: the mica is 40 meshes: 60 mesh-1: 3 mixture.
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| CN202010684897.XA CN111849430A (en) | 2020-07-16 | 2020-07-16 | Preparation method of ultralow permeability agent for water-based drilling fluid |
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| CN202010684897.XA CN111849430A (en) | 2020-07-16 | 2020-07-16 | Preparation method of ultralow permeability agent for water-based drilling fluid |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1432620A (en) * | 2002-01-14 | 2003-07-30 | 中国石油化工股份有限公司 | Temporary leakage-stopping agent for well drilling shielding and its application |
| CN104046338A (en) * | 2014-06-16 | 2014-09-17 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Anti-collapse and leakproof drilling fluid and construction method thereof |
| CN104232037A (en) * | 2014-08-27 | 2014-12-24 | 克拉玛依市金鑫科技有限公司 | Crack plugging agent for oil-base drilling fluids |
| CN105199685A (en) * | 2015-09-23 | 2015-12-30 | 中国石油天然气股份有限公司 | Water-based drilling fluid for leakage protection and sealing of induced fissures |
-
2020
- 2020-07-16 CN CN202010684897.XA patent/CN111849430A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1432620A (en) * | 2002-01-14 | 2003-07-30 | 中国石油化工股份有限公司 | Temporary leakage-stopping agent for well drilling shielding and its application |
| CN104046338A (en) * | 2014-06-16 | 2014-09-17 | 中国石油集团川庆钻探工程有限公司长庆钻井总公司 | Anti-collapse and leakproof drilling fluid and construction method thereof |
| CN104232037A (en) * | 2014-08-27 | 2014-12-24 | 克拉玛依市金鑫科技有限公司 | Crack plugging agent for oil-base drilling fluids |
| CN105199685A (en) * | 2015-09-23 | 2015-12-30 | 中国石油天然气股份有限公司 | Water-based drilling fluid for leakage protection and sealing of induced fissures |
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Application publication date: 20201030 |