CN108949132B - Sand consolidation and blockage removal treatment fluid for sand prevention of fine silt reservoir oil well, sand prevention treatment fluid system and sand prevention method using sand consolidation and blockage removal treatment fluid system - Google Patents
Sand consolidation and blockage removal treatment fluid for sand prevention of fine silt reservoir oil well, sand prevention treatment fluid system and sand prevention method using sand consolidation and blockage removal treatment fluid system Download PDFInfo
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Abstract
The invention relates to a sand consolidation and blockage removal treatment fluid for sand prevention of a fine silt reservoir oil well, a sand prevention treatment fluid system and a sand prevention method using the sand consolidation and blockage removal treatment fluid system, and belongs to the technical field of oil exploitation. The sand consolidation and blockage removal treatment fluid comprises the following components in percentage by mass: 8-12% of sand-fixing blocking remover, 0.5-1.5% of cleanup additive, 0.5-1.5% of corrosion inhibitor, 1-2% of iron ion stabilizer, 1-2% of mutual solvent, 1-2% of ammonium chloride and the balance of water. The sand control treatment fluid system consists of pretreatment fluid, pre-treatment fluid, treatment fluid and displacement fluid, and the volume ratio of the pretreatment fluid to the treatment fluid is as follows in sequence: 4-6: 1-2: 2-3: 1-2, and also discloses a method for preventing sand by using the sand control treating fluid system. The components of the sand control treatment fluid system act synergistically to form a bonding coating on the surfaces of the fine siltstone and the clay particles, and the sand is consolidated by cementation, and after the measures are implemented, the sand control yield increase effect is obvious.
Description
Technical Field
A sand consolidation and blockage removal treatment fluid for sand prevention of a fine silt reservoir oil well, a sand prevention treatment fluid system and a sand prevention method using the sand consolidation and blockage removal treatment fluid system belong to the technical field of oil exploitation.
Background
In the process of oil field development, some fine silt oil reservoir oil wells with low cementing strength are often influenced by sand production in the production process, and conventional mechanical sand control methods can be used for conventional sand production wells, but fine silt, mud or clay substances are produced by part of the oil production wells, so that frequent pump blockage and well repair are caused. For the sand production, the sand control difficulty of the conventional machinery is higher, and even if the sand control is successful, the yield of an oil well is reduced, so that the ideal sand control purpose cannot be achieved.
Chinese patent (publication No. 105019870A, publication No. 2015.11.04) discloses a sand control method for an oil well, which comprises the following steps: 1) lowering a sand control pipe column into the oil well by using a derrick, and enabling the sand control pipe column to reach 9-11 m above an oil layer; installing a wellhead device at the oil well mouth; 2) connecting a pump truck for conveying sand-proof materials with a wellhead device through a ground manifold; 3) the oil pipe is extruded with the pad fluid, so that the pad fluid and the low-temperature curing accelerator are extruded into the stratum needing sand prevention; 4) the oil pipe is extruded with the sand-prevention material, so that the sand-prevention material carried by the sand-carrying fluid is extruded and injected into the stratum needing sand prevention; 5) the oil pipe is enabled to extrude the displacement fluid, so that the sand control material is fully extruded to the stratum, and the sand control material is prevented from being excessively left in a shaft; 6) and closing the well for 2-3 days to solidify the sand control material in the stratum. The oil well sand control method provided by the invention can solidify the stratum, prevent the oil well from being empty, collapsed and even scrapped, and ensure the smooth oil exploitation.
Chinese patent (publication No. CN 102330545A, publication No. 2012.01.25) discloses a heavy oil reservoir oil well sand control method, and specifically discloses the following contents: first, the preparation work includes: pulling out the production pipe column, putting in a sand washing pipe column, probing a sand surface, washing sand, throwing a ball for pressure test, and pulling out the sand washing pipe column; and (5) dredging, scraping and washing the well, and pulling out the pipe column of the dredging well. The sand control construction comprises the following steps: putting the sand control pipe column into the sand control pipe column, and performing magnetic positioning and depth correction; the pressure test is qualified; setting and opening a filling channel; filling sand with the positive circulation sand-carrying liquid and quartz sand; releasing and lifting the sand control pipe column, and pulling out the releasing pipe column; and (5) completing the well, and running an oil production string. The method utilizes the quartz sand filled in the nitriding slotted screen pipe to carry out sand expelling on the oil layer outside, thereby avoiding the formation sand well from entering the pump barrel to cause pump blockage. But the method only has good sand control effect on the oil well of common thick oil, is applied to the sand control of the thick oil well, has the one-time success rate of 100 percent and has the single-well continuous production for more than 600 days.
However, the above prior art still has the following disadvantages:
(1) the mechanical sand control method cannot control fine silt, muddy and clay substances with small particle size;
(2) the sand control screen pipe is easy to be blocked by fine silt and mud, so that the production of an oil well is reduced or cannot be discharged;
(3) the released sand control pipe column put into the well is easy to be buried by sand, and the major repair accident is easy to cause during fishing;
(4) the fracturing sand prevention or filling sand prevention process is complex and the operation cost is high;
(5) the fracturing sand prevention process has higher requirement on the shielding capability of the interlayer;
(6) the freezing point of part of shallow layer loose oil reservoir crude oil is high, and external treatment fluid is easy to cause cold damage to the stratum.
Disclosure of Invention
The first aim of the invention is to provide a sand consolidation and blockage removal treatment fluid for sand control of a fine silt reservoir oil well, which can be used for sand control treatment of the fine silt reservoir oil well.
The second aim of the invention is to provide a sand prevention treatment fluid system for a fine silt reservoir oil well, which consists of pretreatment fluid, pad fluid, sand consolidation and unblocking treatment fluid and displacement fluid, wherein the components of the treatment fluid system act synergistically to form a bonding coating on the surfaces of fine silt sand and clay particles to consolidate the sand.
The third purpose of the invention is to provide a method for preventing sand of the fine silt reservoir oil well by using the sand prevention treatment fluid system, the method comprises the steps of injecting pretreatment fluid, pad fluid, treatment fluid and displacement fluid into the well in sequence, and completing well production after closing the well and reacting for a certain time, wherein after the measures are implemented, the sand prevention and yield increase effects are obvious.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a sand consolidation and blockage removal treatment fluid for sand prevention of a fine silt reservoir oil well comprises the following components in percentage by mass: 8-12% of sand-fixing blocking remover, 0.5-1.5% of cleanup additive, 0.5-1.5% of corrosion inhibitor, 1-2% of iron ion stabilizer, 1-2% of mutual solvent, 1-2% of ammonium chloride and the balance of water.
The sand-fixing blocking remover is XT-68 sand-fixing blocking remover.
The cleanup additive is a polyol nonionic surfactant. The cleanup additive is XT-05 cleanup additive.
The corrosion inhibitor is polycyclic aromatic hydrocarbon quaternary ammonium salt. IS-130 corrosion inhibitor IS preferred.
The mutual solvent is ethylene glycol monoethyl ether, so that the adsorption of the corrosion inhibitor and the surfactant in the stratum can be reduced, and the emulsification blockage can be prevented. Preferably a TH-11 mutual solvent.
The iron ion stabilizer comprises an iron complexing agent, an iron reducing agent and the like, and can delay iron gel precipitation in the acidification process and prevent secondary damage. Preferably an SCA iron ion stabilizer.
The utility model provides a sand control treating fluid system for fine silt oil reservoir oil well, comprises pretreatment fluid, pad fluid, solid sand unblocking treating fluid and displacement fluid, pretreatment fluid, pad fluid, solid sand unblocking treating fluid and displacement fluid's volume ratio is: 40-60: 10-20: 20-30: 10-20 parts of; the sand consolidation and blockage removal treatment fluid is the sand consolidation and blockage removal treatment fluid.
The pretreatment solution comprises the following components in percentage by mass: 2-4% of a cleaning agent and the balance of water. The cleaning agent is a nonionic surfactant. The cleaning agent is an AE-121 cleaning agent.
The pad fluid comprises the following components in percentage by mass: 8-12% of hydrochloric acid, 0.5-1.5% of cleanup additive, 0.5-1.5% of corrosion inhibitor, 1-2% of iron ion stabilizer, 1-2% of mutual solvent, 1-2% of ammonium chloride and the balance of water.
The displacement liquid comprises the following components in percentage by mass: 0.5-1.5% of cleanup additive, 1-2% of mutual solvent, 1-2% of ammonium chloride and the balance of water.
A method for preventing sand of a fine silt reservoir oil well by adopting the sand prevention treatment fluid system comprises the following steps: injecting the pretreatment fluid, the pad fluid, the sand consolidation and blockage removal treatment fluid and the displacement fluid into the well in turn at a discharge capacity of 260-420L/min, closing the well for reaction for 12-48 h, and then injecting the pretreatment fluid, the pad fluid, the sand consolidation and blockage removal treatment fluid and the displacement fluid into the well at a discharge capacity of 500 m3And introducing nitrogen into the bottom of the well for 1-3 h at the discharge rate/h.
After the pretreatment fluid, the pad fluid, the sand consolidation plugging removal treatment fluid and the displacement fluid are injected into the well, the working fluid enters a reservoir and then undergoes a physical and chemical reaction with bottom layer minerals to form a bonding coating on the surfaces of the fine siltstone and the clay particles to consolidate the sand, so that the migration of particles caused by the flow of the fluid is prevented, the purpose of consolidating the sand is achieved, the hydrolysis is further reacted while the sand is consolidated, the purpose of deep plugging removal is achieved, and the problems of production reduction and even well shut-down of the oil well caused by the sand production of the formation and the migration and plugging of the particles are solved.
The freezing point of the crude oil of the partial shallow layer unconsolidated reservoir is higher, the external treatment fluid can cause cold damage to the stratum, in order to avoid causing cold damage to the stratum, the temperature of the treatment fluid is higher than the temperature of the stratum of the oil well measure well section by 8-15 degrees.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention can effectively prevent and treat the fine silt, argillaceous and clay substances with smaller grain diameter which can not be prevented and treated by the mechanical sand control method;
(2) the aim of deep blockage removal can be achieved while sand consolidation, and the problem that the oil well production is reduced due to the fact that a seepage channel and a sand filter pipe are blocked by fine silt is solved;
(3) the process has simple construction steps, does not need sand fracturing and sand prevention, has no release of a sand filtering pipe underground, can effectively avoid major repair fishing operation, can carry out construction without moving a pipe column under proper conditions, reduces operation procedures and reduces measure risks;
(4) the construction pumping pressure is lower than the formation fracture pressure, and the requirement on the barrier capability is low;
(5) the crude oil solidifying point of the loose sand production reservoir is high, the process carries out heating treatment on the pretreatment liquid, can avoid cold damage to the stratum caused by external liquid, and meets the production requirement of an oil extraction plant on sand prevention of the fine silt reservoir.
Detailed Description
1. The raw materials and equipment used in the invention are as follows:
AE-121 cleaning agent: the south Yang Teng oil engineering technology service company provides;
XT-68 sand-fixation blocking remover: offered by Xuntai industries, Inc. in New county;
XT-05 cleanup additive: the Beijing Baofengchun Petroleum technology Co., Ltd;
IS-130 corrosion inhibitor: the Henan oil field Feiya general company provides;
SCA iron ion stabilizer: the Beijing Baofengchun Petroleum technology Co., Ltd;
TH-11 mutual solvent: the Henan oil field Feiya general company provides;
hydrochloric acid and ammonium chloride are common commercial products;
equipment: model 700 pump truck.
2. Examples of the embodiments
Example 1
The sand control treatment fluid system of this embodiment comprises pretreatment fluid, pad fluid, solid sand unblocking treatment fluid and displacement fluid, the volume ratio of pretreatment fluid, pad fluid, solid sand unblocking treatment fluid and displacement fluid is: 50: 10: 20: 10.
the pretreatment solution consists of the following components in percentage by mass: 2% of AE-121 cleaning agent and 98% of water.
The pad fluid consists ofThe composition comprises the following components in percentage by mass: 12 percent of hydrochloric acid, 0.5 percent of XT-05 cleanup additive, 1.5 percent of IS-130 corrosion inhibitor, 2 percent of SCA iron ion stabilizer, 2 percent of TH-11 mutual solvent and 2 percent of NH4Cl and 80% of water, wherein the hydrochloric acid is industrial grade hydrochloric acid with the mass fraction of 31%.
The sand consolidation and blockage removal treatment fluid consists of the following components in percentage by mass: 10 percent of XT-68 sand consolidation blocking remover, 0.5 percent of XT-05 cleanup additive, 2 percent of IS-130 corrosion inhibitor, 2 percent of SCA iron ion stabilizer, 2 percent of TH-11 mutual solvent and 1 percent of NH4Cl and the balance of water.
The displacement liquid consists of the following components in percentage by mass: 0.5 percent of XT-05 cleanup additive, 2 percent of TH-11 mutual solvent, 1 percent of ammonium chloride and the balance of water.
The pretreatment liquid, the pad fluid, the sand consolidation and blockage removal treatment liquid and the displacement liquid are respectively and uniformly stirred in a liquid preparation pool to prepare the sand consolidation and blockage removal treatment liquid.
Example 2
The sand control treatment fluid system of this embodiment comprises pretreatment fluid, pad fluid, solid sand unblocking treatment fluid and displacement fluid, the volume ratio of pretreatment fluid, pad fluid, solid sand unblocking treatment fluid and displacement fluid is: 45: 12: 30: 15.
the pretreatment solution consists of the following components in percentage by mass: the cleaning agent is prepared by stirring and mixing 2 percent of AE-121 cleaning agent and 98 percent of water in a liquid preparation pool.
The pad fluid consists of the following components in percentage by mass: 10 percent of hydrochloric acid, 0.5 percent of XT-05 cleanup additive, 1.5 percent of IS-130 corrosion inhibitor, 2 percent of SCA iron ion stabilizer, 2 percent of TH-11 mutual solvent and 2 percent of NH4Cl and the balance of water are evenly stirred in the liquid preparation tank.
The sand consolidation and blockage removal treatment fluid consists of the following components in percentage by mass: 12 percent of XT-68 sand consolidation blocking remover, 0.5 percent of XT-05 cleanup additive, 2 percent of IS-130 corrosion inhibitor, 2 percent of SCA iron ion stabilizer, 2 percent of TH-11 mutual solvent and 1 percent of NH4Cl and the balance of water are evenly stirred in the liquid preparation tank.
The displacement liquid consists of the following components in percentage by mass: 0.5 percent of XT-05 cleanup additive, 2 percent of TH-11 mutual solvent, 1 percent of ammonium chloride and the balance of water are evenly stirred in a liquid preparation tank.
The pretreatment liquid, the pad fluid, the sand consolidation and blockage removal treatment liquid and the displacement liquid are respectively and uniformly stirred in a liquid preparation pool to prepare the sand consolidation and blockage removal treatment liquid.
Example 3
The sand control treatment fluid system of this embodiment comprises pretreatment fluid, pad fluid, solid sand unblocking treatment fluid and displacement fluid, the volume ratio of pretreatment fluid, pad fluid, solid sand unblocking treatment fluid and displacement fluid is: 60: 20: 25: 20.
the pretreatment solution consists of the following components in percentage by mass: 3.5 percent of AE-121 type cleaning agent and 96.5 percent of water are mixed in a liquid preparation pool.
The pad fluid consists of the following components in percentage by mass: 8.0 percent of hydrochloric acid, 1.0 percent of XT-05 cleanup additive, 0.5 percent of IS-130 corrosion inhibitor, 1.0 percent of SCA iron ion stabilizer, 1.8 percent of TH-11 mutual solvent and 1.0 percent of NH4Cl and the balance of water are evenly stirred in the liquid preparation tank.
The sand consolidation and blockage removal treatment fluid consists of the following components in percentage by mass: 8 percent of XT-68 sand consolidation blocking remover, 1.0 percent of XT-05 cleanup additive, 1.5 percent of IS-130 corrosion inhibitor, 1.2 percent of SCA iron ion stabilizer, 1.0 percent of TH-11 mutual solvent and 1.7 percent of NH4Cl and the balance of water are evenly stirred in the liquid preparation tank.
The displacement liquid consists of the following components in percentage by mass: 1.5 percent of XT-05 cleanup additive, 1.2 percent of TH-11 mutual solvent, 2.0 percent of ammonium chloride and the balance of water are evenly stirred in a liquid preparation pool.
The pretreatment liquid, the pad fluid, the sand consolidation and blockage removal treatment liquid and the displacement liquid are respectively and uniformly stirred in a liquid preparation pool to prepare the sand consolidation and blockage removal treatment liquid.
Example 4
The sand control treatment fluid system of this embodiment comprises pretreatment fluid, pad fluid, solid sand unblocking treatment fluid and displacement fluid, the volume ratio of pretreatment fluid, pad fluid, solid sand unblocking treatment fluid and displacement fluid is: 40: 15: 22: 18.
the pretreatment solution consists of the following components in percentage by mass: 5 percent of AE-121 cleaning agent and 95 percent of water are mixed in a liquid preparation pool.
The pad fluid consists of the following substancesThe weight content of each component is as follows: 9 percent of hydrochloric acid, 1.5 percent of XT-05 cleanup additive, 1.0 percent of IS-130 corrosion inhibitor, 1.4 percent of SCA type iron ion stabilizer, 1.0 percent of TH-11 mutual solvent and 1.2 percent of NH4Cl and the balance of water are evenly stirred in the liquid preparation tank.
The sand consolidation and blockage removal treatment fluid consists of the following components in percentage by mass: 9.0 percent of XT-68 sand consolidation blocking remover, 1.5 percent of XT-05 cleanup additive, 1.8 percent of IS-130 corrosion inhibitor, 1.0 percent of SCA iron ion stabilizer, 1.5 percent of TH-11 mutual solvent and 2.0 percent of NH4Cl and the balance of water are evenly stirred in the liquid preparation tank.
The displacement liquid consists of the following components in percentage by mass: 0.8 percent of XT-05 cleanup additive, 1.0 percent of TH-11 mutual solvent, 1.6 percent of ammonium chloride and the balance of water are evenly stirred in a liquid preparation pool.
The pretreatment liquid, the pad fluid, the sand consolidation and blockage removal treatment liquid and the displacement liquid are respectively and uniformly stirred in a liquid preparation pool to prepare the sand consolidation and blockage removal treatment liquid.
Example 5
In this example, the sand control treatment fluid system of example 1 was applied to one oil well at the second core section of a double river oil field to produce H2 in the whole well2The well distance fault is 8m, the sand production of the stratum is serious, sampling, testing and analyzing are carried out, the median value of the sand production particle size is 0.125mm, the viscosity of crude oil is higher (the viscosity of degassed crude oil at 46.5 ℃) is 3866 mPa.s), the content of colloid asphaltene is 40.36%, the content of mud is 10.1%, normal production cannot be carried out all the time, multiple sand prevention and blockage removal measures such as hanging filtration sand prevention, fracturing filling, oxidation blockage removal and the like are carried out successively, normal production cannot be carried out after the measures, and the yield increasing effect is not ideal.
The sand control treatment fluid system of the embodiment 1 is adopted to carry out the sand control measure site construction on the well, the original well pipe column is utilized, 2 700 type pump trucks are started simultaneously, and the pretreatment fluid is squeezed into the well in sequence by 50 m directly from the sleeve3Front liquid 10m3Sand consolidation and unblocking treatment liquid 20 m3And 10m of displacing liquid3In the implementation process, when the pretreatment liquid is used, a boiler car is used for heating the pretreatment liquid to 60 ℃, the discharge capacity is controlled to be 260L/min, and after the well is closed and reacts for 24 hours, a nitrogen car is used for 500Nm3The discharge volume per hour is 1 hour after nitrogen is introduced into the well bottom to assist in discharging. Completion using screw pumpProduction is carried out from before the measures to after the measures, 11 tons of daily liquid is produced, and 5.9 tons of daily oil is produced. The sand content of the produced liquid is reduced from 0.5 per mill to 0.1 per mill, and the accumulated oil increase of 1074.5 tons is still effective after 487 days of normal production at present, so that the daily oil increase of 2.7 tons is maintained, and the sand prevention and yield increase effects are obvious.
The effective fine silt prevention and control effect is realized after the measures are implemented for 487 days, compared with the conventional acidizing radius of 2-3m, the radius of the treatment process is more than 5m, the deep blockage removing effect is achieved, meanwhile, the sand consolidation and blockage removal are realized by squeezing a fixed pipe column sleeve, the operation cost is saved by 15.3 ten thousand yuan, and the purposes of cost reduction and efficiency improvement are realized.
Example 6
In this example, a test was conducted on one oil well of the two-lower-door oil field using the sand-control treating fluid system of example 2, which was subjected to hole completion and single-production H2Ⅱ25After the small layer is pumped, the oil-discharging operation can not be carried out for a plurality of times due to the well blockage, finally the pump is started up and inspected, the pump is stopped by fine silt, and the tail pipe is provided with 4m of oil-containing silt. Median particle size d by assay50The sand control agent has the advantages of grain size of 0.105mm, great sand control difficulty of conventional machinery, 770 mPa.s of crude oil viscosity at 50 ℃, 31.3% of colloid asphaltene content, serious formation sand production, no pump blockage frequently, and abnormal production caused by multiple operations.
The sand control treatment fluid system in the embodiment 2 is adopted to carry out the sand control measure site construction on the well, 3 700-type pump trucks are started simultaneously, the extrusion pressure is controlled within 10Mpa, the treatment radius is 4m, and the pretreatment fluid is extruded in sequence by 45m3When in use, the mixture needs to be heated to 60 ℃; front liquid 12m330m of sand consolidation and blockage removal treatment fluid3Displacing liquid 15 m3After 48 hours of the shut-in reaction, 500Nm was measured using a nitrogen truck3The discharge volume per hour is 3 hours under the assistance of nitrogen gas introduced into the well bottom.
The sand setting primary pipe column pump is adopted for well completion production, after the measures, 11.3t of the highest daily oil production cannot be produced, the well mouth is sampled, the sand content of the produced fluid is reduced to 0.15 per mill, 894 tons of oil increase is accumulated at present, the effect is still continuous, 3 tons of daily oil increase is kept, 202 days of continuous normal production are achieved, the problem of well blockage and well stoppage is avoided, and the sand prevention requirement of the fine silt reservoir is well met.
Claims (5)
1. The sand control treatment fluid system for the fine silt reservoir oil well is characterized by comprising pretreatment fluid, pad fluid, sand consolidation plugging removal treatment fluid and displacement fluid, wherein the volume ratio of the pretreatment fluid to the pad fluid to the sand consolidation plugging removal treatment fluid to the displacement fluid is as follows: 40-60: 10-20: 20-30: 10-20 parts of;
the pretreatment solution comprises the following components in percentage by mass: 2-4% of a cleaning agent and the balance of water; the cleaning agent is a nonionic surfactant;
the pad fluid comprises the following components in percentage by mass: 8-12% of hydrochloric acid, 0.5-1.5% of cleanup additive, 0.5-1.5% of corrosion inhibitor, 1-2% of iron ion stabilizer, 1-2% of mutual solvent, 1-2% of ammonium chloride and the balance of water;
the sand consolidation and blockage removal treatment fluid comprises the following components in percentage by mass: 8-12% of sand-fixing blocking remover, 0.5-1.5% of cleanup additive, 0.5-1.5% of corrosion inhibitor, 1-2% of iron ion stabilizer, 1-2% of mutual solvent, 1-2% of ammonium chloride and the balance of water; the sand-fixing blocking remover is XT-68 sand-fixing blocking remover.
2. The sand control treatment fluid system of claim 1 wherein the cleaning agent is an AE-121 cleaning agent.
3. The sand control treatment fluid system as recited in claim 1 wherein the displacement fluid comprises the following components by mass: 0.5-1.5% of cleanup additive, 1-2% of mutual solvent, 1-2% of ammonium chloride and the balance of water.
4. A method for sand control of a fine silt reservoir oil well using the sand control treatment fluid system of claim 1, comprising the steps of: injecting the pretreatment liquid, the pad fluid, the treatment liquid and the displacement liquid into the well in turn at a discharge capacity of 260-420L/min, closing the well for reaction for 12-48 h, and then injecting the pretreatment liquid, the pad fluid, the treatment liquid and the displacement liquid into the well at a discharge capacity of 500 m/min3And introducing nitrogen into the bottom of the well for 1-3 h at the discharge rate/h.
5. The sand control method according to claim 4, wherein the temperature of the pretreatment fluid is 8-15 ℃ higher than the formation temperature of the well section of the oil well measure.
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| CN111022011B (en) * | 2019-12-03 | 2022-03-18 | 中国石油化工股份有限公司 | Construction method of foamable resin sand consolidation agent for argillaceous fine silt oil reservoir |
| CN112727422B (en) * | 2020-12-21 | 2022-06-24 | 新疆永升能源有限责任公司 | Sand-carrying liquid squeezing reservoir transformation method |
| CN112877046B (en) * | 2021-01-18 | 2024-01-05 | 中国石油化工股份有限公司 | Deep thickened oil blocking remover for oil well and preparation method and application method thereof |
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