CN113845891A - Sand washing temporary plugging agent for well repair of oil and gas well - Google Patents
Sand washing temporary plugging agent for well repair of oil and gas well Download PDFInfo
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- CN113845891A CN113845891A CN202111303185.XA CN202111303185A CN113845891A CN 113845891 A CN113845891 A CN 113845891A CN 202111303185 A CN202111303185 A CN 202111303185A CN 113845891 A CN113845891 A CN 113845891A
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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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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Abstract
The invention belongs to a sand washing temporary plugging agent for oil-gas well workover; the feed is prepared from the following raw materials in parts by mass: water-absorbent resin: 75-90 parts of biopolymer: 9.9-24 parts of short fibers: 0.1-1.0 part; the water-absorbent resin is selected from water-absorbent resins with absorption capacity and water retention capacity meeting the standard requirements of GB/T22905-2008 'high-absorptivity resin for paper diapers'; the biopolymer is selected from one or a mixture of xanthan gum, guar gum, fenugreek gum and other natural plant gum powder; the short fiber is selected from one or a mixture of cellulose, cotton fiber and asbestos fiber, and the length of the short fiber is between 1 mu m and 1 mm; has the advantages of small leakage, good bearing strength, automatic release and small formation damage.
Description
Technical Field
The invention belongs to the field of oilfield chemicals, and particularly relates to a sand washing temporary plugging agent for well workover of an oil-gas well.
Background
In the process of oil and gas exploitation, along with the deepening of oil field development, part of oil and gas layers generate sand due to factors such as reservoir stratum lithology looseness and production fluctuation, and wells with serious sand generation often bury the well bottom production layers, so that the oil and gas wells have reduced production or no production. Therefore, the sand carrying liquid is pumped in through workover operation, sand is flushed to the ground from the production pipe column, the problem that the yield is influenced due to sand burying of a production zone is solved, in the workover and sand flushing process, when the pressure of a liquid column in a shaft of the production zone is higher than the pressure of the production zone, the leakage of the workover liquid in different degrees can be caused, the normal process of the workover operation is seriously influenced, the sand flushing liquid is wasted, and the damage is brought to the production zone. Especially, when the well is washed and the sand is washed in the field operation, the leakage phenomenon can occur at any time, and if the rapid and effective plugging measure can not be taken, a lot of troubles can be brought to the operation. Therefore, the adoption of the leaking stoppage shielding technology is an effective method in the well repairing operation process.
The temporary plugging sand washing medicament in the current market mainly comprises technical products such as polymer jelly, gel, oil-soluble resin particles, water-absorbing particles and the like. In the field application process, the oil-soluble resin particles are independently used, so that the measures are not very effective when the leakage condition is serious, and the gel and jelly are used, and the conventional polymer is slowly dissolved in the preparation process, so that the gel and jelly generally need to be prepared for a long time, and need to be carried out in a preparation station, and in addition, the problems of transportation and the like are solved when the problems occur on the field, so that the problems generally cannot be solved quickly, and the operation process has to be stopped to influence the construction efficiency; the water-absorbent resin is used independently, and due to the influence of water absorption capacity, the bearing capacity is reduced when the water absorption capacity is too large, the plugging effect is influenced, the water absorption capacity is too small, the leakage loss is large, the leakage control effect is reduced, the consumption needs to be increased for compensation, and the cost is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sand washing temporary plugging agent for well repair with good pressure-bearing strength and small leakage and a preparation method thereof.
The purpose of the invention is realized as follows: the feed is prepared from the following raw materials in parts by mass: water-absorbent resin: 75-90 parts of biopolymer: 9.9-24 parts of short fibers: 0.1-1.0 part; the water-absorbent resin is selected from water-absorbent resins with absorption capacity and water retention capacity meeting the standard requirements of GB/T22905-2008 'high-absorptivity resin for paper diapers'; the biopolymer is selected from one or a mixture of xanthan gum, guar gum, fenugreek gum and other natural plant gum powder; the short fiber is selected from one or a mixture of cellulose, cotton fiber and asbestos fiber, and the length of the short fiber is 1 mu m-1 mm.
The preparation method comprises the following steps:
step 1, adding water-absorbent resin, biopolymer and short fiber into a mixing stirrer;
and 2, stirring and mixing uniformly.
According to the invention, the water absorption, water retention, water control, thickening and pressure bearing capacities of the sand washing temporary plugging agent are realized by adding the water absorption resin, and the auxiliary water control, salt resistance and pressure bearing effects are realized by adding the biopolymer, on one hand, the biopolymer is used for carrying out secondary absorption on the water filtered by the water absorption resin to reduce water loss, on the other hand, the rapid water absorption of the biopolymer forms a filtering membrane on the surface layer of the resin to reduce the influence of salt in water entering the water absorption resin to the water absorption and water retention performances of the water absorption resin, and meanwhile, the biopolymer has strong salt resistance due to the natural high molecular structure of the biopolymer, so that the influence of the salt on the performances of the biopolymer is reduced, and on the fourth, the water insoluble substance contained in the biopolymer can also form a filtration layer on the wall surface of a rock stratum to reduce the permeation capacity of filtrate and improve the pressure bearing capacity of the temporary plugging agent; the effect of assisting in enhancing the pressure bearing capacity of the sand washing temporary plugging agent is achieved by adding the short fibers, on one hand, the short fibers are deposited on the interface of the filtration rock stratum, the permeability of the rock stratum is reduced, the osmotic pressure difference of viscous liquid permeating into the rock stratum is improved, the pressure bearing capacity is enhanced, the binding force of the biopolymer self water insoluble substance and the interface of the rock stratum can also be reduced by depositing the short fibers on the interface of the rock stratum, the backflow relief of the water insoluble substance is facilitated, on the other hand, the risks of shot holes and retention of production tools during backflow and discharge of the short fibers are reduced by controlling the length, the discharge rate of the short fibers is improved, and the recovery of the productivity of a reservoir is achieved.
Compared with the prior art, the sand washing temporary plugging agent has the advantages that the sand washing temporary plugging agent is a multifunctional complex formed by combining water-absorbing resin, biopolymer and short fibers, the water-absorbing resin is mainly used for absorbing water, retaining water and increasing viscosity, the biopolymer is used for assisting water control and has salt resistance and pressure bearing, the short fibers are used for assisting pressure bearing, and the interaction of the water-absorbing resin, the biopolymer and the short fibers enables the sand washing temporary plugging agent to have good water absorbing and controlling capacity and good pressure bearing capacity and good removing capacity, various components are matched with each other and cooperate with each other, sand carrying, water retaining, filtration reducing and pressure bearing temporary plugging capacity of the sand washing temporary plugging agent is provided, and the purposes of sand washing temporary plugging agent sand carrying well repairing liquid and reservoir protection liquid are achieved.
Detailed Description
The invention relates to a sand washing temporary plugging agent for well repair and a preparation method thereof, wherein the temporary plugging agent comprises the following raw materials in parts by weight: water-absorbent resin: 75-90 parts of biopolymer: 9.9-24 parts of short fibers: 0.1-1.0 part; the water-absorbent resin is selected from water-absorbent resins with absorption capacity and water retention capacity meeting the standard requirements of GB/T22905-2008 'high-absorptivity resin for paper diapers'; the biopolymer is selected from one or a mixture of xanthan gum, guar gum, fenugreek gum and other natural plant gum powder; the short fiber is selected from one or a mixture of cellulose, cotton fiber and asbestos fiber, and the length of the short fiber is 1 mu m-1 mm.
The preparation method comprises the following steps:
step 1, adding water-absorbent resin, biopolymer and short fiber into a mixing stirrer;
and 2, stirring and mixing uniformly.
Example one
A sand washing temporary plugging agent for well repair and a preparation method thereof are disclosed, the temporary plugging agent comprises the following raw materials in parts by weight: water-absorbent resin: 90 parts, biopolymer: 9.9 parts, short fiber: 0.1 part; the water-absorbent resin is selected from water-absorbent resins with absorption capacity and water retention capacity meeting the standard requirements of GB/T22905-2008 'high-absorptivity resin for paper diapers'; the biopolymer is selected from one or a mixture of xanthan gum, guar gum, fenugreek gum and other natural plant gum powder; the short fiber is selected from one or a mixture of cellulose, cotton fiber and asbestos fiber, and the length of the short fiber is 1 mu m-1 mm.
The preparation method comprises the following steps:
step 1, adding water-absorbent resin, biopolymer and short fiber into a mixing stirrer;
and 2, stirring and mixing uniformly.
Example two
A sand washing temporary plugging agent for well repair and a preparation method thereof are disclosed, the temporary plugging agent comprises the following raw materials in parts by weight: water-absorbent resin: 85 parts, biopolymer: 14.5 parts, short fiber: 0.5 part; the water-absorbent resin is selected from water-absorbent resins with absorption capacity and water retention capacity meeting the standard requirements of GB/T22905-2008 'high-absorptivity resin for paper diapers'; the biopolymer is selected from one or a mixture of xanthan gum, guar gum, fenugreek gum and other natural plant gum powder; the short fiber is selected from one or a mixture of cellulose, cotton fiber and asbestos fiber, and the length of the short fiber is 1 mu m-1 mm.
The preparation method comprises the following steps:
step 1, adding water-absorbent resin, biopolymer and short fiber into a mixing stirrer;
and 2, stirring and mixing uniformly.
EXAMPLE III
A sand washing temporary plugging agent for well repair and a preparation method thereof are disclosed, the temporary plugging agent comprises the following raw materials in parts by weight: water-absorbent resin: 75 parts, biopolymer: 24 parts, short fiber: 1.0 part; the water-absorbent resin is selected from water-absorbent resins with absorption capacity and water retention capacity meeting the standard requirements of GB/T22905-2008 'high-absorptivity resin for paper diapers'; the biopolymer is selected from one or a mixture of xanthan gum, guar gum, fenugreek gum and other natural plant gum powder; the short fiber is selected from one or a mixture of cellulose, cotton fiber and asbestos fiber, and the length of the short fiber is 1 mu m-1 mm.
The preparation method comprises the following steps:
step 1, adding water-absorbent resin, biopolymer and short fiber into a mixing stirrer;
and 2, stirring and mixing uniformly.
The above detailed description is only specific to possible embodiments of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments, modifications, and alterations without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Test example 1
Randomly selecting an experimental example II, measuring the plugging performance of three products by using common sand washing temporary agent oil-soluble resin and hydroxypropyl guar jelly according to SY/T5834-2014 'Low solid phase well killing fluid performance index and evaluation method', respectively preparing a measuring sample with the concentration of 1% by using clear water, and measuring the API water loss and the high-temperature high-pressure water loss of each product under the standard required pressure (see table 1).
TABLE 1 comparison of different sand-washing temporary plugging agent performances
| Name (R) | API water loss/ml | High temperature high pressure water loss/ml |
| Oil soluble resin | 32 | 86 |
| Hydroxypropyl guar jelly | 19 | 51 |
| Experimental example two | 11 | 24 |
| Standard value | 16 | 40 |
From the measurement results, the relationship of water loss amount is that oil-soluble resin is larger than hydroxypropyl guar gum substance is larger than experimental example II, and the water control and filtration loss reduction capability of the conventional temporary plugging agent cannot meet the standard requirement, so that the water control capability and the pressure bearing capability of the experimental example II sample are better than the performances of the conventional oil-soluble resin and hydroxypropyl guar gum substance.
Test example 2
Randomly selecting oil-soluble resin and hydroxypropyl guar gel which are common sand washing temporary agents in the second experimental examplePreparing 1% test sample with clear water, selecting artificial core with similar performance, loading into core holder, and measuring initial permeability k with standard saline water0Then adding the test samples into the core holder from the positive drive end respectively, performing displacement for 30min by using standard saline water in a constant pressure mode of 5MPa, collecting displacement fluid at the outlet end, pouring out the test sample after the displacement is finished, and performing reverse displacement test by using the standard saline water to test the permeability k of the temporarily blocked core1And calculating the permeability recovery rate of each core, and the results are shown in table 2.
TABLE 2 evaluation of rock core recovery of different sand-washing temporary plugging agents
According to the measurement result, the maximum 30-min filtrate amount of the oil-soluble resin indicates that the temporary plugging performance is poor, the permeability recovery rate of the hydroxypropyl guar jelly is the lowest, and indicates that the hydroxypropyl guar jelly is easy to damage a reservoir stratum, the 30-min filtrate amount and the permeability recovery rate of the sample of the experimental example II are superior to those of the conventional sand flushing temporary plugging agent, and the temporary plugging capability and the reservoir stratum damage recovery rate of the sample of the experimental example II are superior to those of the conventional sand flushing temporary plugging agent.
The test examples described above are some of the test examples of the present invention, and not all of them. The detailed description of the test examples of the present invention is not intended to limit the scope of the claimed invention, but merely represents selected test examples of the present invention. Based on the test examples in the present invention, all other test examples obtained by one of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
Claims (1)
1. The utility model provides an oil gas well is sand washing plugging agent for workover which characterized in that: the composition is prepared from the following raw materials in percentage by mass:
water-absorbent resin: 75-90 parts of biopolymer: 9.9-24 parts of short fibers: 0.1-1.0 part; the water-absorbent resin is selected from water-absorbent resins with absorption capacity and water retention capacity meeting the standard requirements of GB/T22905-2008 'high-absorptivity resin for paper diapers'; the biopolymer is selected from one or a mixture of xanthan gum, guar gum, fenugreek gum and other natural plant gum powder; the short fiber is selected from one or a mixture of cellulose, cotton fiber and asbestos fiber, and the length of the short fiber is 1 mu m-1 mm.
The preparation method comprises the following steps:
step 1, adding water-absorbent resin, biopolymer and short fiber into a mixing stirrer;
and 2, stirring and mixing uniformly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111303185.XA CN113845891A (en) | 2021-11-07 | 2021-11-07 | Sand washing temporary plugging agent for well repair of oil and gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111303185.XA CN113845891A (en) | 2021-11-07 | 2021-11-07 | Sand washing temporary plugging agent for well repair of oil and gas well |
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| Publication Number | Publication Date |
|---|---|
| CN113845891A true CN113845891A (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111303185.XA Pending CN113845891A (en) | 2021-11-07 | 2021-11-07 | Sand washing temporary plugging agent for well repair of oil and gas well |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120186877A1 (en) * | 2010-08-13 | 2012-07-26 | Ezell Ryan G | Modified Cellulosic Polymer for Improved Well Bore Fluids |
| CN102618234A (en) * | 2011-03-30 | 2012-08-01 | 中国石油化工集团公司 | High sulfur-containing gas well gas testing commissioning operation temporary plugging agent |
| CN104498007A (en) * | 2014-12-26 | 2015-04-08 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Low-damage temporary blocking gel for repairing low pressure gas well and preparation method of low-damage temporary blocking gel |
-
2021
- 2021-11-07 CN CN202111303185.XA patent/CN113845891A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120186877A1 (en) * | 2010-08-13 | 2012-07-26 | Ezell Ryan G | Modified Cellulosic Polymer for Improved Well Bore Fluids |
| CN102618234A (en) * | 2011-03-30 | 2012-08-01 | 中国石油化工集团公司 | High sulfur-containing gas well gas testing commissioning operation temporary plugging agent |
| CN104498007A (en) * | 2014-12-26 | 2015-04-08 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Low-damage temporary blocking gel for repairing low pressure gas well and preparation method of low-damage temporary blocking gel |
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Application publication date: 20211228 |
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