CN110317594B - Sand control agent for realizing sand auto-agglutination - Google Patents
Sand control agent for realizing sand auto-agglutination Download PDFInfo
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- CN110317594B CN110317594B CN201910744572.3A CN201910744572A CN110317594B CN 110317594 B CN110317594 B CN 110317594B CN 201910744572 A CN201910744572 A CN 201910744572A CN 110317594 B CN110317594 B CN 110317594B
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- 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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
- C09K8/57—Compositions based on water or polar solvents
- C09K8/572—Compositions based on water or polar solvents containing inorganic compounds
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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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
- C09K8/57—Compositions based on water or polar solvents
- C09K8/575—Compositions based on water or polar solvents containing organic compounds
- C09K8/5751—Macromolecular compounds
- C09K8/5758—Macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
Abstract
The invention belongs to the technical field of petroleum development, and particularly relates to a sand control agent for realizing sand auto-agglutination. The sand control agent comprises three parts of self-aggregation liquid, self-aggregation auxiliary agent and sand consolidation agent; wherein the main ingredient of the self-polymerization liquid is natural polysaccharide compound, and the main ingredient of the self-polymerization auxiliary agent is inorganic salt. The sand control agent realizes sand grain self-aggregation through the synergistic effect of chemical agents, can wrap stratum sand grains into clusters to be fixed at corresponding positions of a stratum, obviously improves the consolidation effect, enlarges the action range, and can also play a good sand consolidation effect on fine silt.
Description
Technical Field
The invention belongs to the technical field of petroleum development, and particularly relates to a sand control agent for realizing sand auto-agglutination.
Background
In recent years, the exploitation degree of most of domestic oil fields is continuously deepened, so that the formation energy is rapidly reduced, the sand production of the oil well is serious, the daily normal production of the oil field is seriously restricted, and the sand prevention work is urgent. At present, composite sand control is mainly adopted, wherein chemical sand control is mainly carried out by coating sand, and a certain effect is achieved in field application, for example, the high-strength high-permeability chemical sand control agent described in CN104650840B is used in a large scale in an oil field, and meanwhile, a plurality of novel materials and sand control technologies are gradually popularized and used in a construction field.
However, the existing chemical sand control method has certain problems: (1) the cementing agent adopted by the traditional chemical sand control is to cement loose sand only at a contact point, so that an effective sand control surface cannot be formed, the formed cementing form has low strength, the formed consolidation effect is poor, and the sand control failure is caused because the sand is very easy to break under the action of the pressure of the ground; the injected cementing agent needs high viscosity to achieve the cementing effect of the form, but the injection of the high-viscosity cementing agent increases the construction burden, so that the safety is greatly reduced; (2) the sand control is carried out in an adhesion mode, the solidification effect can not be achieved for silt and even silt basically, the sand control range is small, the sand control effect can be greatly reduced, and the ideal sand control effect cannot be achieved.
Therefore, a chemical sand control system with good consolidation effect and wide action range is urgently needed to be developed, and becomes a key for improving the sand control success rate, prolonging the sand control validity period and ensuring the sand control effect of the oil field.
Disclosure of Invention
The invention aims to provide a sand control agent for realizing sand particle self-aggregation aiming at the problems of poor consolidation effect and small action range of a sand control agent used in the traditional chemical sand control.
The technical scheme of the invention is as follows: a sand control agent for realizing sand auto-aggregation comprises an auto-aggregation liquid, an auto-aggregation auxiliary agent and a sand consolidation agent; wherein the main ingredient of the self-polymerization liquid is natural polysaccharide compound, and the main ingredient of the self-polymerization auxiliary agent is inorganic salt.
The mass ratio of the self-polymerization liquid to the self-polymerization auxiliary agent is 1: 1-10; the mass ratio of the self-aggregation liquid to the sand consolidation agent is 1-6: 1.
The self-polymerization liquid is a natural polysaccharide compound aqueous solution, and the mass concentration is 0.1-5%; the self-polymerization auxiliary agent is an inorganic salt aqueous solution, and the mass concentration is 0.05-10%.
The mass concentration of the self-polymerization liquid is 3.0-5%; the mass concentration of the self-polymerization auxiliary agent is 1.2-10%.
The natural polysaccharide compound is at least one of sodium metasilicate, agar, gelatin, carrageenan, xanthan gum, sodium alginate and chitosan.
The inorganic salt contains Pb as the ion2+、Cu2+、Cd2+、Ba2+、Sr2+、Co2+、Ni2+、Zn2+、Mn2+、Al3+And H+At least one of them.
The sand consolidation agent is one of epoxy resin and a curing agent system thereof, unsaturated polyester resin and a curing agent system thereof, phenolic resin and a curing agent system thereof, and furan resin and a curing agent system thereof.
The self-polymerizing liquid is 0.5-0.8 m3The delivery volume is injected in/min, and the self-polymerization auxiliary agent is 0.8-1.0 m3The discharge amount per minute is 0.3-0.5 m for sand consolidation agent3Displacement injection per min. The three parts are injected with respective discharge volumes sequentially, so that a better sand cluster self-gathering effect can be formed, the action range is far higher than that of the addition of a single sand control material, and the final action range can reach 20-80 m.
The invention has the beneficial effects that: the sand control agent for realizing sand particle self-polymerization comprises a self-polymerization liquid, a self-polymerization auxiliary agent and a sand consolidation agent; wherein the main ingredient of the self-polymerization liquid is natural polysaccharide compound, and the main ingredient of the self-polymerization auxiliary agent is inorganic salt.
Aiming at the sand production from the stratum, the invention firstly injects the self-aggregation liquid into the stratum to pre-soak the sand grains in the stratum, and then injects the self-aggregation auxiliary agent into the stratum, at the moment, the self-aggregation auxiliary agent and the self-aggregation liquid can generate cross-linking action instantly after meeting the stratum to form a three-dimensional cross-linking network structure, and the sand grains and the like are captured therein, thereby realizing the effect of self-aggregation and agglomeration of the sand grains. After the self-aggregation is finished, sand grains are fixed at corresponding positions of the stratum, in order to adapt to different reservoir characteristics and further improve the sand consolidation strength and the heat resistance of the self-aggregation sand clusters, a sand consolidation agent is introduced on the basis of the previous self-aggregation, the sand consolidation agent is injected into the stratum, the self-aggregation sand clusters are coated, and the sand consolidation agent can be solidified under the action of the temperature of the stratum for a certain time to form a firm cross-linked network, so that the sand consolidation strength and the heat resistance of the self-aggregation sand clusters are improved, the strength of the sand clusters can be improved to more than 5MPa, and the effective permeability is kept at 6 mu m at the same time2And the above.
In conclusion, the sand control agent comprises three parts, wherein three different chemical materials are innovatively adopted to perform combined action to realize sand particle self-aggregation, firstly, the high viscosity of self-aggregation liquid is utilized to realize the pre-soaking process of the formation sand particles, and then, after the self-aggregation liquid is contacted with a self-aggregation auxiliary agent, the formation sand particles can be fixed at corresponding positions in advance, so that a solid foundation can be laid for the subsequent sand fixation more efficiently; and then, injecting a sand consolidation agent into the stratum, and completing the cross-linking and curing process under the action of the temperature of the stratum so as to provide proper sand consolidation strength and heat resistance for the underground sand cluster. Adopt the same kind of equipment to pour into, compare in current chemical sand control agent, the effective action range can be prolonged in the injection of these three kinds of different chemical materials, and the action range can reach 20 ~ 80m to reach the sand control area of ideal.
In the proportioning range, different proportioning combinations are carried out on the three parts, and the compressive strength of the prepared sand column can be adjusted within the range of 5-16 MPa; therefore, the sand control agent can be prepared according to different stratum conditions, so that the cost is saved, a certain transformation effect is achieved, and the sand control efficiency can be improved.
Meanwhile, the three chemical materials are easy to obtain, non-toxic and environment-friendly, meet the environmental protection requirements of oilfield chemistry, are easy to prepare, can be prepared on the oilfield site and put into use immediately, and save the cost of early-stage material preparation. The sand control agent can improve the action temperature, action strength and action range of chemical sand control. The field test proves that the sand control agent has good sand control effect in a sand producing oil well of a sandstone reservoir.
Drawings
FIG. 1 is a graph showing the effect of different mass concentrations of the aggregation liquid on the aggregation effect of sand grains in comparative example 1.
FIG. 2 is a graph showing the effect of different mass concentrations of the aggregation aid on the aggregation effect of sand grains in comparative experiment example 2.
FIG. 3 is a graph showing the effect of the combination of the self-assembly liquid and the self-assembly auxiliary agent on the fine silt in comparative example 3.
Detailed Description
The present invention will be described in detail below with reference to examples.
Example 1
The sand control agent for realizing sand self-polymerization comprises a self-polymerization liquid, a self-polymerization auxiliary agent and a sand consolidation agent; wherein the self-polymerization solution is sodium alginate aqueous solution, and the mass concentration is 0.1%; the self-polymerization auxiliary agent is copper chloride aqueous solution, and the mass concentration is 0.05%; the sand consolidation agent is an epoxy resin and curing agent system thereof.
The mass ratio of the self-polymerization liquid to the self-polymerization auxiliary agent to the sand consolidation agent is 1: 2: 0.5.
wetting sand grains by using the self-aggregation liquid, introducing the sand grains soaked with the blend into the self-aggregation auxiliary agent to form self-aggregation sand clusters instantly, introducing a sand consolidation agent into the sand clusters to coat the self-aggregation sand clusters, and curing at a certain temperature to obtain the sand clusters with the temperature resistance of 140 ℃ and the compressive strength of 10 MPa.
Example 2
The sand control agent for realizing sand self-polymerization comprises a self-polymerization liquid, a self-polymerization auxiliary agent and a sand consolidation agent; wherein the self-polymerization solution is sodium metasilicate aqueous solution, and the mass concentration is 5%; the self-polymerization auxiliary agent is zinc chloride aqueous solution, and the mass concentration is 10%; the sand consolidation agent is furan resin and a curing agent system thereof.
The mass ratio of the self-polymerization liquid to the self-polymerization auxiliary agent to the sand consolidation agent is 1: 5: 0.2.
the three materials are firstly pumped and injected by 0.5-0.8 m through a pump injection procedure of on-site actual construction3Injecting self-polymerizing liquid at a discharge rate of 0.8-1.0 m3Injecting self-polymerization auxiliary agent at a discharge capacity of 0.3-0.5 m3The sand consolidation agent is injected into the displacement of/min, so that a better sand cluster self-aggregation effect can be formed, the action range is far higher than that of the addition of a single sand control material, and the final action range can reach 20-80 m.
Example 3
The sand control agent for realizing sand self-polymerization comprises a self-polymerization liquid, a self-polymerization auxiliary agent and a sand consolidation agent; wherein the self-polymerization solution is carrageenan aqueous solution with the mass concentration of 3 percent; the self-polymerization auxiliary agent is a cobalt sulfate aqueous solution with the mass concentration of 1.2 percent; the sand consolidation agent is phenolic resin and a curing agent system thereof.
The mass ratio of the self-polymerization liquid to the self-polymerization auxiliary agent to the sand consolidation agent is 1: 5: 0.3.
the sand control agent of the embodiment is applied to a vertical tight sandstone gas reservoir well, wherein the formation temperature is 120 ℃, and the sunrise sand is 1.67m3D, 2012.7.30-2012.8.3 metal cotton is subjected to sand filtration and sand control through a sand filter pipe, and water is mixed on a pump for production; 2013.10.15-11.2 high-pressure filling sand control (high-pressure filling quartz sand 15 m)3) (ii) a 2014.6.28-2014.7.20 winding plugging deviceFilling in layers, filling sieve tube ring, adding water to pump (because of mud and sand blocking of pump and tail tube, filling quartz sand 15m in ground3) (ii) a 2016.5.10-2015.5.16 pump checking, leakage finding and sealing (Y211-150 sealing rubber skin is bad, and the 42 th oil pipe body is provided with a hole); 2017.3.7-2017.6.2 pump checking, seal pulling, winding pulling and coating preventing for 4 times, and low-density sand prevention is performed once and the pump is put down (the pump is intact); 2018.4.2 Pump trip, 8: 00 under pump watering and well flushing, 15: 00, the team does work crane activity jam release, well washing is ineffective, well mouth does not return water, sand jam closing is analyzed. Determining to check the pump, filling sand in stratum and preventing sand from self-gathering well wall. Adopting the sand control agent to carry out self-polymerization sand control reconstruction:
(1) the bottom of the lower sand control pipe column is provided with a pen point to retest the sand surface;
(2) replacing a well mouth sealing ring, seating a well mouth, installing all well mouth screws, and tightly jacking diagonal jackscrews;
(3) connecting a ground pipeline, testing the pump and the pressure at 20MPa, and ensuring that the pipe is qualified after 3min without puncture and leakage;
(4) connecting pipeline clean water to wash well to casing return liquid for 5min, and extruding for 3-5m3Clear water, after the pump pressure is stable, the water absorption index is calculated, and the next step is executed after the water absorption index is qualified;
(5) and (3) replacing the pre-posed liquid, clear water, extruding self-polymerization materials and other related construction processes.
Finally, through daily sand production statistics after sand control, the well sand control reconstruction effect is better, and the daily sand production amount after fracturing reconstruction by using the sand control agent is zero.
Example 4
The sand control agent for realizing sand self-polymerization comprises a self-polymerization liquid, a self-polymerization auxiliary agent and a sand consolidation agent; wherein the self-polymerizing solution is agar water solution with mass concentration of 4%; the self-polymerization auxiliary agent is a barium chloride aqueous solution with the mass concentration of 5 percent; the sand consolidation agent is unsaturated polyester resin and a curing agent system thereof.
The mass ratio of the self-polymerization liquid to the self-polymerization auxiliary agent to the sand consolidation agent is 1: 7: 0.2.
when the sand control agent is applied to a well, after the well is fractured repeatedly for 15 years, normal production cannot be carried out all the time due to serious sand production, and then the well is shut down. Before construction, the cumulative oil production of the well is 121t, after sand control is carried out by adopting an artificial well wall, steam injection and rotary pumping are carried out in 6 months, the sand content of the crude oil is measured for several times and is marked or absent, the oil well starts normal production, and within 3 months, the cumulative oil production is 798 t.
Comparative Experimental example 1
And mixing the self-polymerization liquid with different mass concentrations with sand grains, adding the mixture into the same four self-polymerization aids, and observing the aggregation effect of the sand grains. When the mass concentration of the self-aggregation liquid is lower (such as 0.3 percent), the self-aggregation liquid has poor aggregation effect on sand grains and has obvious sand removal condition. The aggregation effect of the self-aggregation liquid on sand grains is obviously improved along with the increase of the mass concentration of the self-aggregation liquid, and no desanding phenomenon is observed when the mass concentration is increased to 3.0 percent. See FIG. 1 for results.
Comparative experiment example 2
Respectively adding the self-aggregation liquid and sand grains after mixing into self-aggregation auxiliaries with different mass concentrations, and observing the aggregation effect of the sand grains: when the mass concentration of the self-aggregation auxiliary agent is lower (such as 0.3 percent), the self-aggregation effect on sand grains is poor, and the sand removal condition is obvious. The agglomeration effect on sand grains is obviously improved along with the increase of the mass concentration of the self-agglomeration auxiliary agent, and when the mass concentration is increased to 1.20 percent, the occurrence of the sand-shedding phenomenon is not observed. See figure 2 for results.
Comparative experiment example 3
The method is characterized in that quartz sand (50%), ceramsite (20-40 meshes, 25%) and ceramsite (70-90 meshes, 25%) are used as a matrix, the stratum environment is simulated by changing the mass fraction of clay (5% of clay, 10% of clay, 20% of clay and 40% of clay), and the effect of the combined action of the self-aggregation liquid and the self-aggregation auxiliary agent on the fine silt is observed. See FIG. 3 for results.
It can be known from fig. 3 that when the mass of the clay reaches 40%, the combined action of the self-aggregation liquid and the self-aggregation auxiliary agent can still achieve a good self-aggregation effect on the system, that is, the self-aggregation system can achieve a good sand consolidation effect on the fine silt, and no sand removal phenomenon occurs.
Claims (4)
1. The application of the sand control agent for realizing sand self-polymerization in the sand production of the stratum is characterized by comprising a self-polymerization liquid, a self-polymerization auxiliary agent and a sand consolidation agent; first injecting into the formationInjecting self-polymerization auxiliary agent into the stratum, and injecting sand consolidation agent into the stratum; the self-polymerization liquid is a natural polysaccharide compound aqueous solution, and the mass concentration is 0.1-5%; wherein the natural polysaccharide compound is at least one of agar, gelatin, carrageenan, xanthan gum, sodium alginate and chitosan; the self-polymerization auxiliary agent is an inorganic salt aqueous solution, and the mass concentration is 0.05-10%; wherein the inorganic salt contains Pb as ion2+、Cu2+、Cd2+、Ba2+、Sr2+、Co2+、Ni2+、Zn2+、Mn2+And Al3+At least one of (1); the sand consolidation agent is one of epoxy resin and a curing agent system thereof, unsaturated polyester resin and a curing agent system thereof, phenolic resin and a curing agent system thereof, and furan resin and a curing agent system thereof.
2. The application of the sand control agent for realizing sand particle self-polymerization in the formation sand production according to claim 1 is characterized in that the mass ratio of the self-polymerization liquid to the self-polymerization auxiliary agent is 1: 1-10; the mass ratio of the self-aggregation liquid to the sand consolidation agent is 1-6: 1.
3. The use of the sand control agent for realizing sand particle self-aggregation in the sand production of the stratum according to claim 1, wherein the mass concentration of the self-aggregation liquid is 3.0-5%; the mass concentration of the self-polymerization auxiliary agent is 1.2-10%.
4. The use of the sand control agent for realizing sand particle self-aggregation in the sand production of the stratum according to claim 1, wherein the self-aggregation liquid is 0.5-0.8 m3The delivery volume is injected in/min, and the self-polymerization auxiliary agent is 0.8-1.0 m3The discharge amount per minute is 0.3-0.5 m for sand consolidation agent3 Displacement injection per min.
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| CN111577215B (en) * | 2020-06-16 | 2022-04-05 | 青岛大地新能源技术研究院 | Sand control system combining high molecules and low-molecular polymers for fine silt |
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