CN115140962A - Time-delay coagulant, preparation method and application thereof - Google Patents
Time-delay coagulant, preparation method and application thereof Download PDFInfo
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- CN115140962A CN115140962A CN202110348811.0A CN202110348811A CN115140962A CN 115140962 A CN115140962 A CN 115140962A CN 202110348811 A CN202110348811 A CN 202110348811A CN 115140962 A CN115140962 A CN 115140962A
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- 239000000701 coagulant Substances 0.000 title claims abstract description 66
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 59
- 239000002002 slurry Substances 0.000 claims abstract description 40
- 239000000725 suspension Substances 0.000 claims abstract description 30
- 238000002844 melting Methods 0.000 claims abstract description 25
- 230000008018 melting Effects 0.000 claims abstract description 25
- 238000005553 drilling Methods 0.000 claims abstract description 13
- 239000006185 dispersion Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 38
- 230000003111 delayed effect Effects 0.000 claims description 31
- 239000012188 paraffin wax Substances 0.000 claims description 23
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 13
- 239000001103 potassium chloride Substances 0.000 claims description 11
- 235000011164 potassium chloride Nutrition 0.000 claims description 11
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000004115 Sodium Silicate Substances 0.000 claims description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 239000004281 calcium formate Substances 0.000 claims description 3
- 229940044172 calcium formate Drugs 0.000 claims description 3
- 235000019255 calcium formate Nutrition 0.000 claims description 3
- 235000006408 oxalic acid Nutrition 0.000 claims description 3
- 235000011148 calcium chloride Nutrition 0.000 claims description 2
- 238000010309 melting process Methods 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims description 2
- 238000007711 solidification Methods 0.000 abstract description 6
- 230000008023 solidification Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract description 3
- 230000015271 coagulation Effects 0.000 description 20
- 238000005345 coagulation Methods 0.000 description 20
- 239000006187 pill Substances 0.000 description 18
- 230000000694 effects Effects 0.000 description 15
- 238000012360 testing method Methods 0.000 description 8
- 230000001804 emulsifying effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 6
- 229940057995 liquid paraffin Drugs 0.000 description 6
- 238000013268 sustained release Methods 0.000 description 5
- 239000012730 sustained-release form Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
-
- 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
- C09K8/467—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 containing additives for specific purposes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Colloid Chemistry (AREA)
Abstract
The invention discloses a time-delay coagulant, a preparation method and application thereof. The preparation method comprises the following steps: step A, mixing 40-60 parts by weight of coagulant with 100 parts by weight of slow release layer, and performing dispersion treatment to obtain suspension; and step B, dripping the turbid liquid into cold water at a temperature 5-10 ℃ higher than the melting point of the slow release layer to obtain the pill-shaped time-delay coagulant. The time-delay coagulant is convenient to use, only needs to be mixed with cement slurry according to actual requirements, when the plugging cement slurry mixed with the time-delay coagulant reaches a certain underground stratum, due to the rise of the environmental temperature, a slow-release layer of the time-delay coagulant is melted, so that the coagulant is fully released, the solidification of the plugging cement slurry is further promoted, and even when the cement slurry in a leaking stratum is diluted by drilling fluid or stratum water, the cement slurry can be quickly solidified, so that the success rate of plugging is greatly improved.
Description
Technical Field
The invention relates to the field of oil and gas well drilling, in particular to a time-delay coagulant, a preparation method and application of the time-delay coagulant, and especially relates to application of the time-delay coagulant in plugging cement slurry.
Background
In the cementing operation of an oil-gas well, cement slurry is pumped into the well through a cement truck pump, and the cement slurry can be replaced into an annular space between the casing and the well through the slurry replacing process, so that the purposes of sealing and isolating oil, gas and water layers are achieved, and the effects of protecting a production layer and supporting a protective casing are achieved. And, in the drilling process, the leakage occurs, and under the condition, a cement truck is usually adopted to pump the cement slurry to the leakage layer. The differences between well cementation and well drilling plugging pumping cement slurry are as follows: the well cementation needs to replace cement slurry to the annulus from the well bottom, and the well drilling plugging only needs to send the cement slurry to the well bottom leakage position.
Lost circulation is one of the more common downhole complications in drilling and cementing processes. Once the well leakage occurs, the well drilling time is consumed, drilling fluid and cement slurry are leaked, the problems of drill sticking, blowout, well collapse, poor well cementation quality and the like can be caused, and even the well hole scrapping accident can be caused, so that the serious economic loss is caused.
Therefore, how to solve the problem of leakage of oil and gas wells is always a difficult problem concerned by various large oil and gas fields. In petroleum engineering, cement slurry is a relatively common plugging system. However, the conventional cement slurry has poor plugging capability under certain conditions, mainly because the well cementation cement truck can only pump cement slurry with certain viscosity, so that water quantity which is more than that required by normal hydration of cement is added when the cement slurry is prepared, so that the cement slurry has over-good fluidity, is not easy to be retained in a leaking layer, is leaked away after the cement slurry is solidified, and cannot play a plugging role.
In the process of well cementation construction of shallow wells or surface casing pipes, although the performance of cement slurry can meet the pumping requirement, the problems of long thickening time and slow strength development exist, and the drilling footage and the well cementation quality are seriously influenced. In addition, the cement paste is added with other additives, such as a dispersing agent, a fluid loss additive and the like, so that the over-retarding of the cement paste is caused.
The setting accelerator acts as a chemical agent and can be used to shorten the thickening time of the cement paste. The hydration reaction of cement can be accelerated and the early strength of cement can be improved by adding an accelerator to cement paste. The coagulant is mainly suitable for engineering construction requiring rapid solidification of cement slurry, such as leakage well cementing, gas well cementing, shallow well cementing, well drilling engineering plugging and the like.
Therefore, how to provide a coagulant which can simultaneously meet the pumping requirement of a cement truck and promote the solidification effect of a plugging agent is one of the problems to be solved in the field.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a time-delay coagulant, a preparation method and application thereof.
In a first aspect, the present invention provides a process for the preparation of a delayed coagulant, comprising the steps of:
step A, mixing 40-60 parts by weight of coagulant with 100 parts by weight of slow release layer, and performing dispersion treatment to obtain suspension;
and step B, dripping the turbid liquid into cold water at a temperature 5-10 ℃ higher than the melting point of the slow release layer to obtain the pill-shaped time-delay coagulant.
The preparation method of the time-delay coagulant provided by the invention is characterized in that a slow-release layer is wrapped outside the coagulant in a dropping pill mode, so that the coagulant is conveniently mixed into the plugging cement slurry and is further conveniently transported to a target layer. In the target layer, when the environmental temperature reaches a certain temperature, the slow release layer of the time-delay coagulant is melted, and the coagulant is released, so that the effect of promoting the solidification of the plugging cement paste is achieved, and the solidification time of the plugging cement paste is greatly shortened. In addition, even if the plugging cement slurry is diluted by drilling fluid or formation water when in a leaking layer, the plugging cement slurry can be solidified due to the existence of the time-delay coagulant, so that the success rate of plugging is greatly improved.
According to some embodiments of the method of preparing a delayed time accelerator according to the present invention, the accelerator is selected from at least one of potassium chloride, sodium silicate, triethanolamine, oxalic acid, calcium formate, and calcium chloride.
According to some embodiments of the method of preparing a delayed setting accelerator according to the invention, the setting accelerator has a solid particle size of 300 to 400 mesh. In the present invention, by controlling the particle size range of the coagulant, the coagulant and the sustained-release layer can be uniformly dispersed when mixed.
According to some embodiments of the method of preparing a delayed coagulant of the present invention, the slow release layer is paraffin wax. Preferably, the paraffin wax is at least one selected from the group consisting of number 70 to 90 paraffin wax.
In a preferred embodiment of the present invention, the paraffin wax is at least one of a number 70 paraffin wax having a melting point of 70 to 72 ℃, a number 80 paraffin wax having a melting point of 80 to 82 ℃, and a number 90 paraffin wax having a melting point of 90 to 92 ℃.
According to some embodiments of the process for the preparation of a delayed action coagulant according to the invention, in step a, the conditions of the dispersion treatment process comprise: the rotating speed is 2000-2500 rpm, the temperature is 25-35 ℃, and the time is 20-40 minutes. For example, the rotational speed of the dispersion process may be 2000 rpm, 2100 rpm, 2200 rpm, 2300 rpm, 2400 rpm, 2500 rpm, and any value therebetween. The temperature during the dispersion process may be 25 ℃, 26 ℃, 27 ℃, 28 ℃, 29 ℃,30 ℃, 31 ℃, 32 ℃, 33 ℃, 34 ℃, 35 ℃ and any value therebetween. The time for the dispersion process may be 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, and any value therebetween.
According to some embodiments of the method for preparing a time-delay coagulant of the present invention, in the step B, when the suspension is dropped into cold water, the dropping speed of the suspension is 1 to 12 drops/second. In different embodiments of the invention, the dropping speed of the suspension is controlled by controlling the number of the dropping heads according to different production requirements.
According to some embodiments of the process for the preparation of a delayed setting accelerator according to the invention, the drop-pill shaped delayed setting accelerator has a particle size of 0.5mm or less.
According to some embodiments of the process for the preparation of a delayed action coagulant according to the invention, before step a, the process further comprises: melting the slow release layer into a liquid state. Preferably, the temperature of the melting process is 5-10 ℃ higher than the melting point temperature of the slow release layer.
According to a particular embodiment of the process for the preparation of a delayed coagulant according to the invention, the process comprises: the paraffin wax is melted into liquid at a temperature 5-10 ℃ higher than the melting point of the paraffin wax. Pouring the coagulant into the melted liquid paraffin according to the weight ratio, and dispersing the mixed material by using a kettle bottom emulsifying machine to obtain suspension after 30 minutes. Injecting the suspension into a pill dropping machine, and keeping the temperature of the suspension to be 5-10 ℃ higher than the melting point temperature of the solid paraffin. The dripping speed of the dripping pill machine is controlled to be 1-12 drops/second, the suspension is dripped into a cooling water bath to obtain a dripping pill-shaped time-delay coagulant with the particle size of less than 0.5mm, and the dripping pill-shaped time-delay coagulant is dried.
The preparation method of the delayed coagulant provided by the invention is to prepare the delayed coagulant in the form of dropping pills, so that the delayed coagulant is wrapped by the sustained release layer, and the reaction conditions of temperature, dispersion conditions, dropping speed of a dropping pill machine and the like in each stage are strictly controlled in the preparation process, so that the dropping pill-shaped delayed coagulant with the particle size meeting the requirement and the sustained release layer uniformly wrapped outside can be obtained.
According to a second aspect of the invention, there is provided a delayed action coagulant obtained according to the above-mentioned process.
According to some embodiments of the delayed setting accelerator according to the invention, the delayed setting accelerator has a particle size of 0.5mm or less.
The time-delay coagulant prepared by the method is convenient to use, and can be used only by mixing drop pill-shaped time-delay coagulant particles into cement according to actual requirements. And the water-cement ratio of the cement paste can be controlled by measuring the density of the mixed material. When the plugging cement slurry mixed with the time-delay coagulant reaches a certain underground stratum, due to the rise of the environmental temperature, the slow-release layer of the time-delay coagulant is melted, so that the coagulant is fully released, and then the solidification of the plugging cement slurry is promoted.
In a third aspect, the invention provides a method of preparing a time-delay accelerator as defined above or the use of a time-delay accelerator as defined above in the field of drilling oil and gas wells. Preferably applied to plugging cement slurry, and can shorten the setting time of the plugging cement slurry. But is not limited thereto.
The invention has the beneficial effects that:
the preparation method of the delayed coagulant provided by the invention enables the sustained-release layer to wrap the coagulant by preparing the form of the dropping pill. The time-delay coagulant prepared by the invention is convenient to use, and can be used only by mixing drop pill-shaped time-delay coagulant particles into cement according to actual requirements. When the plugging cement slurry mixed with the time-delay coagulant reaches a certain underground stratum, due to the rise of the environmental temperature, the slow-release layer of the time-delay coagulant is melted, so that the coagulant is fully released, and then the solidification of the plugging cement slurry is promoted.
According to the time-delay coagulant provided by the invention, the delayed release layers with different melting points can be selected to wrap the coagulant according to different temperatures of the stratum positions of a target well, and when the temperature of the leakage layer is higher than the melting point of the delayed release layer by 3-10 ℃, the delayed release layer can be melted. In practical application, different sustained-release layers can be selected according to different formation temperatures.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description of the invention is given by way of example only, and is not intended to limit the scope of the invention.
The test equipment and part of the reagents used in the present invention are as follows:
(1) The pill machine is available from Beijing Zhongtianhuitong science and technology Co., ltd, and is a HTYZJ-B type full-automatic pellet machine.
(2) The kettle bottom emulsifying machine is purchased from Shanghai full simple electro mechanical Co., ltd, and is model DME115.
(3) The retarder was purchased from Texas continental shelf oil engineering technology, inc. and was model retarder SCR.
The remaining reagents used in the present invention are commercially available.
[ example 1 ]
Taking 100 parts by weight of No. 70 solid paraffin with the melting point of 70 ℃, melting the solid paraffin at the temperature of 75 ℃, taking 60 parts by weight of potassium chloride with the grain diameter of 300 meshes to 350 meshes, pouring the potassium chloride into the melted liquid paraffin, and dispersing the mixed material by using a kettle bottom emulsifying machine at the temperature of 30 ℃ at 2000 r/min to obtain suspension.
Injecting the obtained suspension into a pill dropping machine, and keeping the temperature of the suspension at 75 ℃.
The dropping speed of the pill dropping machine is controlled to be 1 drop/second, the suspension is dropped into a cooling water bath to obtain the pill-shaped delayed coagulation accelerator 1# with the particle size of less than 0.5mm, and the coagulation accelerating effect test is shown in table 1.
[ example 2 ] A method for producing a polycarbonate
Taking 100 parts by weight of No. 80 solid paraffin with the melting point of 80 ℃, melting the solid paraffin at the temperature of 88 ℃, taking 50 parts by weight of sodium silicate with the particle size of 300-400 meshes, pouring the sodium silicate into the melted liquid paraffin, dispersing the mixed material by using a kettle bottom emulsifying machine at the conditions of 2200 rpm and 25 ℃ for 30 minutes to obtain suspension.
Injecting the obtained suspension into a pill dropping machine, and keeping the temperature of the suspension at 88 ℃.
The dropping speed of the pill dropping machine is controlled to be 2 drops/second, the suspension is dropped into a cooling water bath, and the pill-shaped delayed coagulation accelerator 2# with the particle size of less than 0.5mm is obtained, and the coagulation accelerating effect test is shown in table 1.
[ example 3 ] A method for producing a polycarbonate
Taking 100 parts by weight of No. 90 solid paraffin with the melting point of 90 ℃, melting the solid paraffin at the temperature of 100 ℃, taking 40 parts by weight of triethanolamine, pouring the triethanolamine into the melted liquid paraffin, dispersing the mixed material by using a kettle bottom emulsifying machine at the conditions of 2500 rpm and 35 ℃, and obtaining suspension after 30 minutes.
Injecting the obtained suspension into a pill dropping machine, and keeping the temperature of the suspension at 100 ℃.
The dropping speed of the pill dropping machine is controlled to be 5 drops/second, the turbid liquid is dropped into a cooling water bath to obtain the pill-shaped time-delay coagulant 3# with the particle diameter smaller than 0.5mm, and the coagulation accelerating effect is shown in table 1.
[ example 4 ] A method for producing a polycarbonate
The same procedure as in example 1, except that: the coagulant is oxalic acid instead of potassium chloride. The prepared dripping pill-shaped time-delay coagulant 4# with the particle size less than 0.5mm has the coagulation accelerating effect shown in the table 1.
[ example 5 ]
The same procedure as in example 1, except that: calcium formate is used to replace potassium chloride as coagulant. The prepared dripping pill-shaped delayed coagulant 5# with the particle size less than 0.5mm has the coagulation accelerating effect shown in the table 1.
[ example 6 ]
The same procedure as in example 1, except that: the coagulant is calcium chloride instead of potassium chloride. The prepared dripping pill-shaped delayed coagulant 6# with the particle size less than 0.5mm has the coagulation accelerating effect shown in the table 1.
Comparative example 1
Taking 90 parts by weight of No. 70 solid paraffin with the melting point of 70 ℃, melting the solid paraffin at the temperature of 75 ℃, taking 65 parts by weight of potassium chloride with the grain diameter of 300 meshes-350 meshes, pouring the potassium chloride into the melted liquid paraffin, dispersing the mixed material by using a kettle bottom emulsifying machine at 2000 r/min and 30 ℃, and obtaining suspension after 30 minutes.
Injecting the obtained suspension into a pill dropping machine, and keeping the temperature of the suspension at 75 ℃.
The dropping speed of the pill dropping machine is controlled to be 1 drop/second, the suspension is dropped into a cooling water bath to obtain the pill-shaped delayed coagulation accelerator 7# with the particle size of less than 0.5mm, and the coagulation accelerating effect test is shown in table 1.
Comparative example 2
Taking 110 parts by weight of No. 70 solid paraffin with the melting point of 70 ℃, melting the solid paraffin at the temperature of 75 ℃, taking 35 parts by weight of potassium chloride with the grain diameter of 300 meshes-350 meshes, pouring the potassium chloride into the melted liquid paraffin, dispersing the mixed material by using a kettle bottom emulsifying machine at 2000 r/min and 30 ℃, and obtaining suspension after 30 minutes.
Injecting the obtained suspension into a pill dropping machine, and keeping the temperature of the suspension at 75 ℃.
The dropping speed of the pill dropping machine is controlled to be 1 drop/second, the suspension is dropped into a cooling water bath to obtain the pill-shaped delayed coagulation accelerator No. 8 with the particle size of less than 0.5mm, and the coagulation accelerating effect test is shown in Table 1.
[ test examples ]
In the invention, the testing process of the coagulation promoting effect comprises the following steps:
800g of cement, 350g of water and 4g of retarder (retarder SCR available from Texas continental shelf oil engineering Co., ltd.) were mixed uniformly to obtain a base cement slurry. The setting conditions of the basic cement slurry are as follows: at a temperature of 98 deg.C, it takes 3 hours and 30 minutes to solidify.
The retardation setting accelerators 1# -8# obtained in the above examples and comparative examples were added to the base cement slurry, respectively, and the respective samples were observed for their setting accelerating effect on the base cement slurry at different temperatures with time, and the test results are shown in table 1.
Wherein the weight of the time delay coagulant 1# -8# is 15% of the weight of the base cement paste.
TABLE 1
As can be seen from table 1, the delayed coagulation accelerator provided in the embodiment of the present invention is mixed into the basic cement slurry, and can accelerate the coagulation of the basic cement slurry, and after the melting temperature of the slow release layer is reached, the delayed coagulation accelerator cannot achieve a good coagulation accelerating effect in the first 15 minutes, the basic cement slurry can flow, and can achieve complete coagulation in 40 minutes, the transition time is short, and the rapid coagulation of the cement slurry can be accelerated, and the delayed coagulation accelerating effect is very beneficial to the field plugging application. However, the time-delay setting accelerator prepared in the comparative example cannot achieve the effect of time-delay setting acceleration or even set cement paste due to different weight ratios of the setting accelerator and the slow-release layer.
In the practical application process, the slow release layer with proper temperature is selected only according to the temperatures of different stratums, and the construction process and the construction time are adjusted to be applied to different environments.
What has been described above is merely a preferred example of the present invention. It should be noted that other equivalent variations and modifications can be made by those skilled in the art based on the technical teaching provided by the present invention, and the protection scope of the present invention should be considered.
Claims (10)
1. A method of preparing a time-delayed coagulant, said method comprising the steps of:
step A, mixing 40-60 parts by weight of coagulant with 100 parts by weight of slow release layer, and performing dispersion treatment to obtain suspension;
and step B, dripping the turbid liquid into cold water at the temperature of 5-10 ℃ higher than the melting point of the slow release layer to obtain the pill-shaped time delay coagulant.
2. The method of claim 1, wherein the accelerator is at least one selected from the group consisting of potassium chloride, sodium silicate, triethanolamine, oxalic acid, calcium formate, and calcium chloride.
3. The method according to claim 1 or 2, characterized in that the solid particle size of the setting accelerator is 300 to 400 mesh.
4. The preparation method according to any one of claims 1 to 3, wherein the slow release layer is paraffin wax, and preferably the paraffin wax is at least one selected from paraffin wax Nos. 70 to 90.
5. The production method according to any one of claims 1 to 4, wherein in the step A, the conditions of the dispersion treatment process include: the rotating speed is 2000-2500 rpm, the temperature is 25-35 ℃, and the time is 20-40 minutes.
6. The production method according to any one of claims 1 to 5, wherein in the step B, the suspension is dropped into cold water at a rate of 1 to 12 drops/sec.
7. The method according to any one of claims 1 to 6, wherein the particle size of the delay coagulant in the form of pellets is 0.5mm or less.
8. The method of any one of claims 1-7, wherein prior to step a, the method further comprises: melting the slow release layer into a liquid state, preferably, the temperature of the melting process is 5-10 ℃ higher than the melting point temperature of the slow release layer.
9. A time-delayed coagulant obtainable by the process according to any one of claims 1 to 8.
10. A method of preparing the delayed time setting accelerator of any of claims 1 to 8 or the use of the delayed time setting accelerator of claim 9 in the field of oil and gas well drilling, preferably in a lost circulation cement slurry.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110348811.0A CN115140962A (en) | 2021-03-31 | 2021-03-31 | Time-delay coagulant, preparation method and application thereof |
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| CN202110348811.0A CN115140962A (en) | 2021-03-31 | 2021-03-31 | Time-delay coagulant, preparation method and application thereof |
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| CN (1) | CN115140962A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116445143A (en) * | 2023-04-27 | 2023-07-18 | 中国石油大学(华东) | Single-liquid plugging system and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036301A (en) * | 1974-10-29 | 1977-07-19 | Standard Oil Company (Indiana) | Process and composition for cementing casing in a well |
| GB0517179D0 (en) * | 2001-08-29 | 2005-09-28 | Baker Hughes Inc | Lost circulation materials (LCM's) effective to maintain emulsion stability of drilling fluids |
| CN106916577A (en) * | 2017-03-20 | 2017-07-04 | 西南石油大学 | A kind of oil-well cement temperature sensitive sustained-release coagulant |
-
2021
- 2021-03-31 CN CN202110348811.0A patent/CN115140962A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4036301A (en) * | 1974-10-29 | 1977-07-19 | Standard Oil Company (Indiana) | Process and composition for cementing casing in a well |
| GB0517179D0 (en) * | 2001-08-29 | 2005-09-28 | Baker Hughes Inc | Lost circulation materials (LCM's) effective to maintain emulsion stability of drilling fluids |
| CN106916577A (en) * | 2017-03-20 | 2017-07-04 | 西南石油大学 | A kind of oil-well cement temperature sensitive sustained-release coagulant |
Non-Patent Citations (1)
| Title |
|---|
| 盛华刚: "《中药药剂学课堂笔记》", 31 October 2018, 同济大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116445143A (en) * | 2023-04-27 | 2023-07-18 | 中国石油大学(华东) | Single-liquid plugging system and preparation method thereof |
| CN116445143B (en) * | 2023-04-27 | 2024-04-26 | 中国石油大学(华东) | Single-liquid plugging system and preparation method thereof |
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Application publication date: 20221004 |