CN113355078A - High-temperature-resistant potassium formate weighted fracturing fluid, and preparation method and application thereof - Google Patents
High-temperature-resistant potassium formate weighted fracturing fluid, and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a high-temperature-resistant potassium formate weighted fracturing fluid, and a preparation method and application thereof. The high-temperature resistant potassium formate weighted fracturing fluid comprises the following components in percentage by weight: 0.28-0.37 wt% of guanidine gum; 0.05-0.10 wt% of borax; 33.3 to 81.3 wt% of potassium formate; 0.02-0.04 wt% of organic acid; 0.01-0.03 wt% of deoxidant; 0.3-0.5 wt% of a cleanup additive; 0.3-0.5 wt% of organic boron crosslinking agent; 0.07-0.15 wt% of sodium hydroxide; the balance of water, wherein the guar gum is modified hydroxypropyl guar gum or carboxymethyl hydroxypropyl guar gum. The high-temperature resistant potassium formate weighted fracturing fluid has the weighted density of up to 1.60g/cm3The method can ensure the safe construction of high-temperature deep wells and high-fracture pressure reservoirs, improve the effective weighting capability and reduce the cost of the organic salt weighted fracturing fluid.
Description
Technical Field
The invention relates to the technical field of oil and gas field reservoir transformation, in particular to a high-temperature-resistant potassium formate weighted fracturing fluid, and a preparation method and application thereof.
Background
Along with the progress of drilling and completion technology, deep wells and ultra-deep wells of various large oil fields at home and abroad are gradually increased, reservoirs of the deep wells and the ultra-deep wells mostly have the characteristics of buried depth (larger than 5000m), high temperature (larger than 120 ℃), high formation pressure coefficient (larger than 1.8), high closed stress (larger than 130MPa) and the like, and complex working conditions such as sand production, high pump pressure and the like easily occur in oil testing operation. The well mouth construction pressure exceeds the upper pressure limit of the existing equipment during the fracturing operation of partial deep wells and ultra-deep wells, and the weighted fracturing fluid is one of the most effective measures for improving the fracturing construction success rate and guaranteeing safe construction.
When insoluble solid-phase particles are used as a weighting agent in the fracturing fluid, the risk that the weighting agent cannot be discharged from the stratum is increased; using salts of divalent metals, e.g. Ca2+、Mg2+When the weight is increased, it will react with NaCO3The type formation water reacts and precipitates to block the formation; the weight density of the monovalent inorganic salt is lower or the use cost is too high, such as the composite weight of potassium chloride and sodium nitrate, and the weight density is not more than 1.33g/cm3And KBr and NaBr are expensive as weighting agents and have low cost performance. Therefore, in the practical process, organic salt weighting fracturing fluid systems such as potassium formate and the like are developed, the system density can meet the construction requirement, and meanwhile, the cost of the weighting fracturing fluid is effectively reduced. However, in the field application process, it is difficult to find that the potassium formate aggravates the gel breaking of the fracturing fluid system, and the system needs to be optimized to improve the performance.
For example, CN201910464347 discloses a high temperature resistant weighting fracturing fluid and a preparation method thereof, the formulation is 0.15 wt% -0.6 wt% of a thickening agent, 0-0.05 wt% of an acidic pH regulator, 10 wt% -70 wt% of a weighting agent, 0.4 wt% -1.0 wt% of a cross-linking agent, 0.01 wt% -0.2 wt% of a cleanup additive, 0.01 wt% -0.2 wt% of a bactericide, 0.01 wt% -2.0 wt% of a temperature stabilizer, 0.1 wt% -1.0 wt% of an acidic gel breaker, and the balance of water. However, in the technical scheme, alkali metal halide, alkali metal formate and the like are used for weighting, and hydroxypropyl modified guar gum, an organic boron crosslinking agent and the like are used for forming a fracturing fluid system, so that the fracturing fluid is high in cost.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant potassium formate weighted fracturing fluid, and a preparation method and application thereof, so as to improve the temperature resistance of the potassium formate weighted fracturing fluid.
In order to achieve the above object, according to one aspect of the present invention, there is provided a high temperature resistant potassium formate weighted fracturing fluid. The high-temperature resistant potassium formate weighted fracturing fluid comprises the following components in percentage by weight: 0.28-0.37 wt% of guanidine gum; 0.05-0.10 wt% of borax; 33.3 to 81.3 wt% of potassium formate; 0.02-0.04 wt% of organic acid; 0.01-0.03 wt% of deoxidant; 0.3-0.5 wt% of a cleanup additive; 0.3-0.5 wt% of organic boron crosslinking agent; 0.07-0.15 wt% of sodium hydroxide; the balance of water, wherein the guar gum is modified hydroxypropyl guar gum or carboxymethyl hydroxypropyl guar gum.
Further, the organic acid is one or two of citric acid, malic acid, tartaric acid and succinic acid; citric acid is preferred.
Further, the oxygen scavenger is sodium thiosulfate and/or sodium sulfite; sodium thiosulfate is preferred.
Further, the organic boron crosslinking agent is an organic boron crosslinking agent DY-1.
Further, the cleanup additive is cleanup additive MJ-1.
Furthermore, the weighting density of the high-temperature resistant potassium formate weighted fracturing fluid is 1.20-1.60 g/cm3。
Further, the temperature resistance of the high-temperature resistant potassium formate weighted fracturing fluid is 170 ℃.
According to another aspect of the invention, a preparation method of the high-temperature-resistant potassium formate weighted fracturing fluid is provided. The preparation method comprises the following steps: mixing potassium formate with water, stirring and dissolving to obtain a potassium formate solution; adding guanidine gum, organic acid and borax into the potassium formate solution under stirring, and stirring until the guanidine gum is completely swelled to obtain potassium formate aggravated guanidine gum base solution; sequentially adding a deoxidant and a cleanup additive into the potassium formate weighted guanidine gum base fluid, and stirring to obtain a high-temperature resistant potassium formate weighted fracturing fluid base fluid; mixing an organic boron crosslinking agent with water, adding sodium hydroxide, and stirring to obtain a crosslinking agent of the potassium formate weighted fracturing fluid; the high-temperature resistant potassium formate weighted fracturing fluid can be prepared by mixing the base fluid of the potassium formate weighted fracturing fluid with a cross-linking agent of the potassium formate weighted fracturing fluid.
Furthermore, the weight ratio of the crosslinking agent of the potassium formate weighted fracturing fluid base fluid to the potassium formate weighted fracturing fluid is (100:0.8) - (100: 1.2).
According to a further aspect of the invention, the high-temperature resistant potassium formate weighted fracturing fluid is applied to reservoir reconstruction of oil and gas fields.
The high-temperature resistant potassium formate weighted fracturing fluid has the weighted density of up to 1.60g/cm3The weight density can be adjusted to 1.20-1.60 g/cm by adjusting the addition amount of potassium formate3The range is adjustable; the temperature resistance of the potassium formate weighted fracturing fluid gel reaches 170 ℃, the safe construction of a high-temperature deep well and a high-fracture pressure reservoir can be guaranteed, the effective weighting capability is improved, and the cost of the organic salt weighted fracturing fluid is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows the temperature and shear resistance curves of the high temperature resistant potassium formate weighted fracturing fluid of example 1;
FIG. 2 shows the temperature and shear resistance curves of the high temperature resistant potassium formate weighted fracturing fluid of example 2; and
figure 3 shows the temperature and shear resistance curves of the high temperature resistant potassium formate weighted fracturing fluid of example 3.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
According to an exemplary embodiment of the present invention, a high temperature resistant potassium formate weighted fracturing fluid is provided. The high-temperature resistant potassium formate weighted fracturing fluid comprises the following components in percentage by weight: 0.28-0.37 wt% of guanidine gum; 0.05-0.10 wt% of borax; 33.3 to 81.3 wt% of potassium formate; 0.02-0.04 wt% of organic acid; 0.01-0.03 wt% of deoxidant; 0.3-0.5 wt% of a cleanup additive; 0.3-0.5 wt% of organic boron crosslinking agent; 0.07-0.15 wt% of sodium hydroxide; the balance of water, wherein the guar gum is modified hydroxypropyl guar gum or carboxymethyl hydroxypropyl guar gum.
The high-temperature resistant potassium formate weighted fracturing fluid has the weighted density of up to 1.60g/cm3The weight density can be adjusted to 1.20-1.60 g/cm by adjusting the addition amount of potassium formate3The range is adjustable; the temperature resistance of the potassium formate weighted fracturing fluid gel reaches 170 ℃, the safe construction of a high-temperature deep well and a high-fracture pressure reservoir can be guaranteed, the effective weighting capability is improved, and the cost of the organic salt weighted fracturing fluid is reduced.
Wherein the organic acid is one or two of citric acid, malic acid, tartaric acid and succinic acid; preferably citric acid, to promote the dispersion and stickiness of guar gum in saline. In a typical embodiment of the present invention, the oxygen scavenger is sodium thiosulfate and/or sodium sulfite; sodium thiosulfate is preferred. According to an exemplary embodiment of the present invention, the organoboron crosslinker is organoboron crosslinker DY-1 and according to an exemplary embodiment of the present invention, the cleanup additive is cleanup additive MJ-1.
The high-temperature resistant potassium formate weighted fracturing fluid has the weighted density of up to 1.60g/cm3The weight density can be adjusted to 1.20-1.60 g/cm by adjusting the addition amount of potassium formate3The range is adjustable; the temperature resistance of the potassium formate aggravated fracturing fluid gel reaches 170 ℃.
According to a typical embodiment of the invention, a preparation method of the high-temperature resistant potassium formate weighted fracturing fluid is provided. The preparation method comprises the following steps: mixing potassium formate with water, stirring and dissolving to obtain a potassium formate solution; adding guar gum, organic acid and borax into the potassium formate solution under stirring, and stirring until the guar gum is fully swelled (the full swelling means that the liquid viscosity does not increase along with the time) to obtain potassium formate-weighted guar gum base solution; sequentially adding a deoxidant and a cleanup additive into the potassium formate weighted guanidine gum base fluid, and stirring to obtain a high-temperature resistant potassium formate weighted fracturing fluid base fluid; mixing an organic boron crosslinking agent with water, adding sodium hydroxide, and stirring to obtain a crosslinking agent of the potassium formate weighted fracturing fluid; the high-temperature resistant potassium formate weighted fracturing fluid can be prepared by mixing the base fluid of the potassium formate weighted fracturing fluid with a cross-linking agent of the potassium formate weighted fracturing fluid.
Preferably, the weight ratio of the crosslinking agent of the potassium formate weighted fracturing fluid base fluid to the potassium formate weighted fracturing fluid is (100:0.8) - (100: 1.2).
According to a typical embodiment of the invention, the application of the high-temperature-resistant potassium formate weighted fracturing fluid in oil and gas field reservoir reconstruction is provided.
The following examples are provided to further illustrate the advantageous effects of the present invention.
Example 1
The high-temperature resistant potassium formate weighted fracturing fluid comprises the following components in percentage by weight:
0.28 wt% of guanidine collagen powder
0.05 percent by weight of borax
33.3% by weight of potassium formate
Citric acid 0.02 wt%
Sodium thiosulfate 0.01 wt%
MJ-1 0.3wt％
DY-1 0.3wt％
0.07 wt% of sodium hydroxide
The balance being water
Wherein the product name of the organic boron crosslinking agent is DY-1, belongs to the organic boron crosslinking agent and is provided by pilot plant of engineering and technology research institute of Xinjiang oil field company; the product name of the cleanup additive is MJ-1, belongs to fluorocarbon surfactants, and is provided by Conn, Inc., of Miquan.
The preparation method of the high-temperature resistant potassium formate weighted fracturing fluid comprises the following steps: weighing 333g of potassium formate, adding the potassium formate into 660.4g of water, and stirring to completely dissolve the potassium formate to obtain a potassium formate solution; adding 0.5g of borax and 0.2g of citric acid into the potassium formate solution under stirring, dissolving, adding 2.8g of guar gum powder, and stirring until the guar gum powder is completely swelled to obtain potassium formate weighted guar gum base solution; and sequentially adding 0.1g of sodium thiosulfate and MJ-13 g of MJ-13 g into the potassium formate weighted guanidine gum base solution, and stirring for 20min to obtain the potassium formate weighted fracturing fluid base solution.
And sequentially adding 30gDY-1 g and 7g of sodium hydroxide into 63g of water, and fully and uniformly stirring to obtain the potassium formate weighted fracturing fluid crosslinking agent.
100g of the potassium formate weighted fracturing fluid base fluid and 1g of the potassium formate weighted fracturing fluid cross-linking agent are mixed to prepare the potassium formate weighted fracturing fluid gel.
The formula of the high-temperature resistant potassium formate weighted fracturing fluid and the weighted density of a weighted fracturing fluid system prepared by the preparation method thereof are 1.20g/cm3The temperature resistance can reach 150 ℃.
Example 2
The high-temperature resistant potassium formate weighted fracturing fluid comprises the following components in percentage by weight:
0.32 wt% of guanidine collagen powder
0.07 wt% of borax
57.1% by weight of potassium formate
Citric acid 0.03 wt%
Sodium thiosulfate 0.02 wt%
MJ-1 0.4wt％
DY-1 0.4wt％
0.10 wt% of sodium hydroxide
The balance being water
Wherein the product name of the organic boron crosslinking agent is DY-1, belongs to the organic boron crosslinking agent and is provided by pilot plant of engineering and technology research institute of Xinjiang oil field company; the product name of the cleanup additive is MJ-1, belongs to fluorocarbon surfactants, and is provided by Conn, Inc., of Miquan.
The preparation method of the high-temperature resistant potassium formate weighted fracturing fluid comprises the following steps: weighing 571g of potassium formate, adding the potassium formate into 420.6g of water, and stirring to completely dissolve the potassium formate to obtain a potassium formate solution; adding 0.7g of borax and 0.3g of citric acid into the potassium formate solution under stirring, dissolving, adding 3.2g of guar gum powder, and stirring until the guar gum powder is completely swelled to obtain potassium formate weighted guar gum base solution; and sequentially adding 0.2g of sodium thiosulfate and MJ-14 g of MJ-14 g into the potassium formate weighted guanidine gum base solution, and stirring for 20min to obtain the potassium formate weighted fracturing fluid base solution.
And (3) sequentially adding 40gDY-1 g and 10g of sodium hydroxide into 50g of water, and fully and uniformly stirring to obtain the potassium formate weighted fracturing fluid crosslinking agent.
100g of the potassium formate weighted fracturing fluid base fluid and 1g of the potassium formate weighted fracturing fluid cross-linking agent are mixed to prepare the potassium formate weighted fracturing fluid gel.
The formula of the high-temperature resistant potassium formate weighted fracturing fluid and the weighted density of a weighted fracturing fluid system prepared by the preparation method thereof are 1.40g/cm3The temperature resistance can reach 160 ℃.
Example 3
The high-temperature resistant potassium formate weighted fracturing fluid comprises the following components in percentage by weight:
0.37 wt% of guanidine collagen powder
0.10 wt% of borax
81.3% by weight of potassium formate
Citric acid 0.04 wt%
Sodium thiosulfate 0.03 wt%
MJ-1 0.5wt％
DY-1 0.5wt％
0.15 wt% of sodium hydroxide
The balance being water
Wherein the product name of the organic boron crosslinking agent is DY-1, belongs to the organic boron crosslinking agent and is provided by pilot plant of engineering and technology research institute of Xinjiang oil field company; the product name of the cleanup additive is MJ-1, belongs to fluorocarbon surfactants, and is provided by Conn, Inc., of Miquan.
The preparation method of the high-temperature resistant potassium formate weighted fracturing fluid comprises the following steps: 813g of potassium formate is weighed and added into water, and the potassium formate solution is obtained by stirring the potassium formate and the water to be completely dissolved; adding 1.0g of borax and 0.4g of citric acid into the potassium formate solution under stirring, dissolving, adding 3.7g of guanidine collagen powder, and stirring until the guanidine collagen powder is completely swelled to obtain potassium formate weighted guanidine gum base solution; and sequentially adding 0.3g of sodium thiosulfate and MJ-15 g of MJ-15 g into the potassium formate weighted guanidine gum base solution, and stirring for 20min to obtain the potassium formate weighted fracturing fluid base solution.
And (3) sequentially adding 50gDY-1 g and 15g of sodium hydroxide into 35g of water, and fully and uniformly stirring to obtain the potassium formate weighted fracturing fluid crosslinking agent.
100g of the potassium formate weighted fracturing fluid base fluid and 1g of the potassium formate weighted fracturing fluid cross-linking agent are mixed to prepare the potassium formate weighted fracturing fluid gel.
The formula of the high-temperature resistant potassium formate weighted fracturing fluid and the weighted density of a weighted fracturing fluid system prepared by the preparation method thereof are 1.60g/cm3The temperature resistance can reach 170 ℃.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the safe construction of a high-temperature deep well and a high-fracture pressure reservoir is guaranteed, the effective weighting capacity is improved, and the cost of the organic salt weighted fracturing fluid is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The high-temperature-resistant potassium formate weighted fracturing fluid is characterized by comprising the following components in percentage by weight: 0.28-0.37 wt% of guanidine gum; 0.05-0.10 wt% of borax; 33.3 to 81.3 wt% of potassium formate; 0.02-0.04 wt% of organic acid; 0.01-0.03 wt% of deoxidant; 0.3-0.5 wt% of a cleanup additive; 0.3-0.5 wt% of organic boron crosslinking agent; 0.07-0.15 wt% of sodium hydroxide; the balance of water, wherein the guar gum is modified hydroxypropyl guar gum or carboxymethyl hydroxypropyl guar gum.
2. The high-temperature resistant potassium formate weighted fracturing fluid of claim 1, wherein the organic acid is one or two of citric acid, malic acid, tartaric acid and succinic acid; citric acid is preferred.
3. The high temperature resistant potassium formate weighted fracturing fluid of claim 1, wherein the oxygen scavenger is sodium thiosulfate and/or sodium sulfite; sodium thiosulfate is preferred.
4. The high-temperature resistant potassium formate weighted fracturing fluid of claim 1, wherein the organic boron crosslinking agent is an organic boron crosslinking agent DY-1.
5. The high-temperature resistant potassium formate weighted fracturing fluid as claimed in claim 1, wherein the cleanup additive is cleanup additive MJ-1.
6. The high-temperature-resistant potassium formate weighted fracturing fluid as claimed in claim 1, wherein the weighted density of the high-temperature-resistant potassium formate weighted fracturing fluid is 1.20-1.60 g/cm3。
7. The high-temperature-resistant potassium formate weighted fracturing fluid as claimed in claim 1, wherein the temperature resistance of the high-temperature-resistant potassium formate weighted fracturing fluid is 170 ℃.
8. A method for preparing the high-temperature resistant potassium formate weighted fracturing fluid as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
mixing potassium formate with water, stirring and dissolving to obtain a potassium formate solution;
adding guanidine gum and organic acid and borax into the potassium formate solution under stirring, and stirring until the guanidine gum is completely swelled to obtain potassium formate aggravated guanidine gum base solution;
sequentially adding a deoxidant and a cleanup additive into the potassium formate weighted guanidine gum base fluid, and stirring to obtain the high-temperature resistant potassium formate weighted fracturing fluid base fluid;
mixing an organic boron crosslinking agent with water, adding sodium hydroxide, and stirring to obtain a crosslinking agent of the potassium formate weighted fracturing fluid;
and mixing the potassium formate weighted fracturing fluid base fluid with a cross-linking agent of the potassium formate weighted fracturing fluid to prepare the high-temperature-resistant potassium formate weighted fracturing fluid.
9. The method according to claim 8, wherein the weight ratio of the crosslinking agent of the base fluid of the potassium formate-weighted fracturing fluid to the crosslinking agent of the potassium formate-weighted fracturing fluid is (100:0.8) - (100: 1.2).
10. Use of the high temperature resistant potassium formate weighted fracturing fluid of any one of claims 1 to 7 in oil and gas field reservoir reconstruction.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353871A (en) * | 2022-09-02 | 2022-11-18 | 西南石油大学 | Low-friction saturated potassium formate aggravated fracturing fluid |
| CN115785938A (en) * | 2022-11-09 | 2023-03-14 | 中石化石油工程技术服务有限公司 | Crosslinking online controllable high-temperature-resistant guanidine gum fracturing fluid system and preparation method thereof |
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| CN102391851A (en) * | 2011-10-14 | 2012-03-28 | 中国石油天然气集团公司 | Acid carboxymethyl guargum fracturing fluid and preparation method thereof |
| CN102876314A (en) * | 2012-09-27 | 2013-01-16 | 中国石油化工股份有限公司 | Weighted fracturing fluid |
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2021
- 2021-06-04 CN CN202110627546.XA patent/CN113355078A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102391851A (en) * | 2011-10-14 | 2012-03-28 | 中国石油天然气集团公司 | Acid carboxymethyl guargum fracturing fluid and preparation method thereof |
| CN102876314A (en) * | 2012-09-27 | 2013-01-16 | 中国石油化工股份有限公司 | Weighted fracturing fluid |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115353871A (en) * | 2022-09-02 | 2022-11-18 | 西南石油大学 | Low-friction saturated potassium formate aggravated fracturing fluid |
| CN115785938A (en) * | 2022-11-09 | 2023-03-14 | 中石化石油工程技术服务有限公司 | Crosslinking online controllable high-temperature-resistant guanidine gum fracturing fluid system and preparation method thereof |
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Application publication date: 20210907 |