CN109209299B - Method for manufacturing artificial well wall by saturated filling of cemented gravel around well hole - Google Patents
Method for manufacturing artificial well wall by saturated filling of cemented gravel around well hole Download PDFInfo
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
-
- 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
- C09K8/5755—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Abstract
The invention discloses a method for manufacturing an artificial well wall by saturated filling of cementible gravel around a well hole, which is a special sand prevention and anti-collapse novel technology for realizing saturated filling of cementible gravel around the well hole by adopting an end desanding and filling mode through large discharge and high pump pressure to support a rock wall and stabilize sand bodies. The method comprises the steps of firstly, effectively cleaning a flow guide channel by using a pre-posed fluid, removing the resistance of micro-solid phase and high-consistency fluid to construction drainage, then, sending the cemented gravel to the end part of the edge of the void zone rock by using a low-flow-resistance carrying fluid, enabling the fluid to quickly drain on the surface of the rock and the cemented gravel to be filter-pressed to form an artificial abrasive belt, and continuously filling until all the voids are filled, namely, achieving saturated filling to form an artificial sand wall. Then the strength of the artificial sand wall is improved by a heat curing mode, and the purposes of repairing and prolonging the service life of the production well are achieved.
Description
Technical Field
The invention relates to a method for exploiting or injecting oil, gas and water from a well in the industries of petroleum, natural gas, coal bed gas, geothermal water, dry hot rock and the like, belongs to the technical field of sand production prevention and collapse prevention of oil, water and gas wells, and particularly relates to a method for manufacturing an artificial well wall by filling cemented gravel around a well hole in a saturated manner.
Background
In the process of exploiting or injecting oil, gas and water from a well in the industries of petroleum, natural gas, coal bed gas, geothermal water, dry hot rock and the like, the edge end part of the well wall is washed by fluid, so that gravel is separated from a matrix and falls off from the surface of the rock, and the gravel falls off and collapses due to the fact that the rock loses support in serious conditions, so that the damage to the oil, gas and water well is great. If gravel or blocks fall to bury oil, gas and water layers, the production and injection of oil, gas and water wells are stopped, the well repair operation and equipment maintenance and equipment updating are frequent, and the operation cost is increased. The formation sand production and the block falling collapse cause the vacancy around the well hole, the ground stress transmission is discontinuous, the deformation and the damage of the casing pipe are easily caused, and even the production well is scrapped.
The prior sand prevention and collapse prevention method for oil, water and gas wells comprises a chemical method, a mechanical method, a chemical-mechanical composite method and the like, and the process measures are characterized in that: the chemical method aims at the stratum, the mechanical method aims at the shaft, and the composite method only respectively aims at the superposition of two targets, and has the defects of directly reducing or gradually reducing the production capacity in the production process. Chemical sand control, which is mainly to adopt and inject a certain amount of curable resin or chemical agent capable of fixing sand through electrical action into the internal pores of a sand production stratum, is characterized in that the chemical agent occupies the surface space of the pores and reduces the permeability, thereby causing the reduction of yield, so the method is gradually reduced in practical application. The mechanical sand control is mainly a physical method of putting a screen pipe in a sand production well section or refilling gravel outside the screen pipe to block formation sand production, and is characterized in that formation sand and cement are filtered and embedded on the surface of the screen pipe or the surface of the filled gravel, fine sand is damaged when passing through the screen pipe, fine sand and coarse sand are blocked during grading, the former causes production stop, and the latter causes low yield and low efficiency, but the method has high construction success rate, longer effective period and lower cost, so the method is one of the most widely applied measures at present, and has the biggest defects of high difficulty and high cost of screen pipe pulling in the later period and easy sidetracking caused by operation accidents. The composite sand control is an integral process which is completed by chemical sand control and mechanical sand control in the same construction, has the advantages of the chemical sand control and the mechanical sand control, has higher success rate and longer period, and is one of the fastest processes in recent years. Through search, 13 relevant patent documents are found: "a double-layer wire-wrapped packing stainless steel composite sand control screen (CN 202325435U)", "a high-strength composite sand control screen (CN 201363128Y)", "an oil-gas well composite sand control perforation completion device (CN 2564744Y)", "a fiber composite sand control material and a preparation method thereof (CN 101942296A)", "an oil well artificial well wall sand control process technology (CN 1279336A)", "an oil-water well composite sand control method (CN 1414209A)", "a well drilling device for strengthening well wall (CN 103835649A)", "an artificial sand control shaft wall of high temperature and high pressure and its process facilities (CN 1472418)", "the artificial shaft wall sand control technique of compound haydite (CN 1184085A)", "the artificial shaft wall sand control method of thickened oil gas injection hot production (CN 1046988C)", "the artificial shaft wall low-displacement double-layer sand control method of plastic apricot shell (CN 1091493A)", "the new method of forming artificial shaft wall in oil gas well by using water-absorbing resin (CN 102134979A)", "the sand control method of artificial shaft wall and its sand control material (CN 107163926A)", etc. Although these patent technologies have their advantages, they still do not solve the key problems of blockage and difficult tube drawing.
Disclosure of Invention
In order to solve the defects of the existing oil, water and gas well sand prevention and collapse prevention technology, the invention aims to provide a new artificial wall building sand prevention and collapse prevention idea and a construction method.
The principle of the invention is as follows: the artificial cementable sand is filled in the empty space of the well hole, the artificially filled cementable sand can be completely in full contact with and cemented with the surface of the rock in the empty space of the stratum, no residual space exists when the artificial cementable sand is in contact with the edge end face of the stratum, and an artificial sand wall is formed after solidification. The invention discloses a method for manufacturing an artificial well wall by saturated filling of cementible gravel around a well hole, which is a special sand prevention and anti-collapse novel technology for realizing saturated filling of cementible gravel around the well hole by adopting an end desanding and filling mode through large discharge and high pump pressure to support a rock wall and stabilize sand bodies. The method comprises the steps of firstly, effectively cleaning a flow guide channel by using a pre-posed fluid, removing the resistance of micro-solid phase and high-consistency fluid to construction drainage, then, sending the cemented gravel to the end part of the edge of the void zone rock by using a low-flow-resistance carrying fluid, enabling the fluid to quickly drain on the surface of the rock and the cemented gravel to be filter-pressed to form an artificial abrasive belt, and continuously filling until all the voids are filled, namely, achieving saturated filling to form an artificial sand wall. Then the strength of the artificial sand wall is improved by a heat curing mode, and the purposes of repairing and prolonging the service life of the production well are achieved. The invention mainly solves the technical problems that the horizontal well screen pipe is difficult to prevent sand again after being damaged, a sand prevention tool is difficult to put into a sidetracking slim hole, a stable well wall is difficult to establish due to collapse of an open hole, precise water injection cannot be realized after sand prevention of the horizontal well screen pipe, the sand prevention tool cannot be put into a casing pipe after deformation, and the like, and provides a new technical approach for recovery and stable production of the well in future.
The invention realizes the purpose through the following technical scheme:
a method for manufacturing an artificial well wall by saturated filling of cemented gravel around a well hole comprises the following steps:
(1) firstly, squeezing and injecting a preposed cemented sand guide fluid into a well hole by adopting large discharge capacity, pressing open or acidizing or flushing a target void stratum, flushing a directly manufactured filling space or a filling space formed under high pressure difference and an existing filling space in the production process, and pushing away pollutants to a far well zone so as to achieve the effect that the pollutants are not carried by low-speed fluid enough to move after recovery production; the weight percentage of each component in the cemented sand guiding liquid is as follows:
0.5 to 5.0 percent of chelating agent,
2.0 to 10.0 percent of surfactant,
4 to 15 percent of acid,
2.0 to 5.0 percent of anti-swelling agent or clay stabilizer,
the balance of water;
wherein:
the chelating agent is EDTA series or amino methylene phosphate series;
the surfactant polyoxyethylene series, the amino carboxylic acid and the salt series thereof, the amino alkyl sulfonic acid and the salt series thereof or the amphoteric active agent series;
the acid is one or a combination of more of HCl, HF, acetic acid, lactic acid, amino alkyl phosphoric acid and amino alkyl sulfonic acid;
the anti-swelling agent or clay stabilizer is NH4Cl, KCl, quaternary ammonium salt series or quaternary phosphonium salt series;
(2) then, cementing sand coupling reinforcing liquid which is added with cementing gravel is squeezed into the well hole, pollutants are carried and retained in a far well zone, the pollutants are prevented from being transported and stacked to a near well zone after production, and the sand ratio in the cementing sand coupling reinforcing liquid is controlled to be 3-10%; the weight percentage of each component in the consolidated sand coupling reinforcing liquid is as follows:
2.0 to 10.0 percent of surfactant,
2.0 to 6.0 percent of retention agent (sand inhibitor),
KCl 2.0-3.0%
the balance of water;
wherein:
the surfactant is a distyryl polyoxyethylene ether series, an alkylphenol polyoxyethylene ether series, a high-carbon fatty alcohol polyoxyethylene ether series or an ethylene oxide addition product series of polypropylene glycol;
the retention agent (sand inhibitor) is a copolymer series of dimethyl diallyl ammonium chloride and acrylamide and acrylic acid water-soluble monomers, a copolymer series of dimethyl diallyl ammonium chloride and acrylic acid and styrene amphiphilic monomers, a polycondensate series of epichlorohydrin and organic amine or a polycondensate series of alkyl halide and organic amine;
(3) secondly, adding the cementable gravel into the cementable sand coupling reinforcing liquid and then continuously squeezing and injecting the cementable gravel into the well hole, wherein the sand ratio in the cementable sand coupling reinforcing liquid is controlled to be 8-30%, so that spaces with different bearing capacities are sequentially filled according to the rise of pressure, and the bearing capacity of the filled spaces is gradually improved;
(4) then, continuously filling the cementing and pore-forming cementing liquid added with the cementing sand, wherein the sand ratio in the cementing sand and pore-forming cementing liquid is controlled to be 15-40%, the space is sequentially saturated, the cementing sand is filtered to a shaft, and the filling construction is finished when the sand is buried to a non-sand-suction well section; the cementing sand pore-forming cementing liquid comprises the following components in percentage by weight:
1 to 10 percent of curing agent,
2.0 to 10.0 percent of surfactant,
acid 1.0-3.0%, except HF and HBF4，
1.0 to 3.0 percent of anti-swelling agent or clay stabilizer,
the balance of water;
wherein:
the curing agent is hexamethylenetetramine, formaldehyde, furfural, urea resin series, thermosetting phenolic resin series or epoxy resin series;
the surfactant is a distyryl polyoxyethylene series, an alkylphenol polyoxyethylene ether series, a high-carbon fatty alcohol polyoxyethylene ether series, and an ethylene oxide addition product series of polypropylene glycol;
the acid is one or a combination of more of HCl, acetic acid, lactic acid, amino alkyl phosphoric acid or amino alkyl sulfonic acid;
the anti-swelling agent or clay stabilizer is NH4CL, KCl, quaternary ammonium salt series or quaternary phosphonium salt series;
the cementable gravel in the steps (2), (3) and (4) consists of a supporting matrix and a cementing agent, and the addition amount of the cementing agent is 7-12% of the total weight of the cementable gravel; the supporting matrix comprises one or more of quartz sand, ceramsite sand and hardened cement particles, and the cementing agent is one or more of phenolic resin, epoxy resin, furfural resin, amino resin and unsaturated resin;
(5) then, squeezing and injecting displacement fluid into the well hole to ensure that sand can be cemented and the tubing shoe can be discharged;
(6) then, drilling a flushing plug to the bottom of the well by using a drilling and flushing tool, and fully and circularly flushing the well until the returned liquid is free of pollutants;
(7) and finally, closing the well and waiting for coagulation or circularly heating or chemically heating and thermally curing to finish the artificial well wall.
The scheme is that the selection of the cementing sand guiding liquid, the cementing sand coupling reinforcing liquid and the cementing sand pore-forming cementing liquid is based on the following principles:
the sand guide fluid can be cemented by using a chemical agent with the functions of dissolving, corrosion, chelating, desorption, cleaning and the like as a pre-solution, and pollutants in a near-wellbore zone are removed, such as: asphaltenes, oil scale, wax scale, organic salt scale, high-valence metal ion precipitate scale, fine sand, shale cement, drilling mud, well workover and downhole insolubles, and the like. The construction discharge capacity of 3.0-500.0 times of the production speed is adopted to squeeze and inject the pad fluid (capable of cementing sand guide fluid), preferably 5.0-100.0 times of the discharge capacity is adopted to push the removed object away to a far well zone, and the effect that the low-speed fluid is not enough to carry pollutants to move after the recovery production is achieved. The guide fluid for the cemented sand consists of chemical agents such as a surfactant, an acid, a chelating agent, a clay stabilizer and the like, and is a formation cleaning fluid and a protection fluid. Wherein: any surfactant which does not cause emulsification or precipitation effect can be used, such as polyoxyethylene series, aminocarboxylic acid and its salt series, aminoalkylsulfonic acid and its salt series, amphoteric surfactant series, and the like. Acids which are controlled to avoid precipitates and which are non-oxidizing can be used, such as HCl, HF, hydrogen fluoride,Acetic acid, lactic acid, aminoalkylphosphoric acid, aminoalkylsulfonic acid, and the like. Any chelating agent that is capable of converting insoluble metal ions to soluble and stable under formation water conditions may be used, such as the EDTA series, the amino methylene phosphate series, and the like. All clay stabilizers with clay lattice mosaicism and clay electrical properties can be used, such as NH4Cl, KCl, quaternary ammonium salt series, quaternary phosphonium salt series, and the like.
The chemical agent containing the surfactant and the zwitterionic polymer is used as a carrier fluid, namely, the cemented sand coupling reinforcing fluid can be used for cementing the sand, so that pollutants can be retained in a far well zone, such as: copolymers of dimethyldiallylammonium chloride with acrylamide and acrylic acid, among others, and whatever method is capable of forming zwitterionic compounds, prevent the migration and accumulation of contaminants to the near wellbore area. Controlling the discharge capacity to be above the critical flow rate of the cemented sand at the filling part in the well hole and below the critical flow rate of the cemented sand at the filling part outside the well hole, so that the cemented sand is retained in the filling space, and the carrier fluid is drained smoothly by the stratum. The cementing sand coupling strengthening liquid consists of a surfactant, a sand consolidating agent serving as a retention agent and a chemical agent for adsorbing negative electric substances, and is a dispersing liquid for cementing sand, a promoting liquid for accelerating the adhesion of a sand filtering belt and a retention liquid for retaining the negative electric substances. Wherein: all surfactants capable of enhancing the surface hydrophilicity of the cemented sand and accelerating the bonding speed of the filter sand belt can be used, such as distyryl polyoxyethylene ether series, alkylphenol polyoxyethylene ether series, high-carbon fatty alcohol polyoxyethylene ether series, ethylene oxide addition compound series of polypropylene glycol and the like. All chemical agents capable of adsorbing the surface of stratum rock and generating multi-point adsorption on fine insoluble substances such as argillaceous substances, asphaltene, inorganic salt scale, organic salt scale and the like can be used as retention agents, such as a copolymer series of dimethyl diallyl ammonium chloride, acrylamide, acrylic acid and other water-soluble monomers, a copolymer series of dimethyl diallyl ammonium chloride, acrylic acid, styrene and other amphiphilic monomers, a polycondensate series of epoxy chloropropane and organic amine, a polycondensate series of alkyl halide and organic amine and the like.
Chemical agents which can promote solidification and ensure effective permeability are adopted as desanding liquid,the pore-forming cementing liquid is continuously filled, the space is sequentially saturated, the cemented gravel is filtered to a shaft, the pressure is quickly increased when the sand is buried to a non-sand-suction well section, the highest pressure can reach the construction pressure limit, and the filling construction can be immediately finished at the moment. The pore-forming cementing liquid for the cemented sand consists of a surfactant, an anti-swelling agent, an acid, a curing agent and the like. Wherein: all the surfactants capable of accelerating the bonding speed of the artificial well wall can be used, such as distyryl polyoxyethylene series, alkylphenol polyoxyethylene series, high-carbon fatty alcohol polyoxyethylene ether series, ethylene oxide addition product series of polypropylene glycol and the like. Any acidic water-soluble compound that does not corrode and can consolidate the sand and promote the phenolic resin dehydroxylation reaction can be used, such as HCl, acetic acid, lactic acid, aminoalkylphosphoric acid, aminoalkylsulfonic acid, and the like. HF. HBF4Etc. are not available. Any compound capable of crosslinking phenolic resins can be used, such as hexamethylenetetramine, formaldehyde, furfural, urea-formaldehyde resins, thermosetting phenolic resins, epoxy resins, and the like.
Adding the cemented sand with the short-term steering function, such as: and the effective steering time Tx = 5 or 8 or 10 (min) and the like, and the spaces with different pressure bearing capacities are filled in sequence according to the pressure rise. The pressure bearing capacity of the filled space is gradually improved. The cemented sand consists of a supporting matrix and a cementing agent. Wherein: any solid particles that can maintain a fixed physical dimension under oil, water, or gas conditions can be used, such as quartz sand, ceramsite sand, hardened cement particles, and the like. Any cross-linking compound that can bind the support matrix to the desired strength can be used, such as phenolic resins, epoxy resins, furfural resins, amine-based resins, unsaturated resins, and the like.
Based on the above principle, the present invention can be optimized as follows:
further preferably, in the condensable sand guiding liquid of the step (1):
the chelating agent is ethylenediamine tetraacetic acid or diethylenetriamine pentamethylene phosphonic acid;
the surfactant includes: 1.0-5.0% of alkyl polyoxyethylene ether with cloud point less than or equal to 30 ℃ and 1.0-5.0% of alkyl polyoxyethylene ether with cloud point more than or equal to 100 ℃;
the acid comprises: 0.5-3.0% of HF, 3.0-10.0% of HCl and 0.5-2.0% of lactic acid.
Further preferably, in the curable sand coupling reinforcing liquid of the step (2):
the surfactant includes: 1.0-5.0% of alkyl polyoxyethylene ether with cloud point less than or equal to 30 ℃ and 1.0-5.0% of alkyl polyoxyethylene ether with cloud point more than or equal to 100 ℃;
the retention agent (inhibitor) is a homopolymer or copolymer of dimethyldiallylammonium chloride with acrylamide and acrylic acid.
Further preferably, the cemented sand is cemented sand containing a short-acting diverting agent which is pyromellitic dianhydride or naphthalene formate, and the diverting effective time Tx = 5 or 8 or 10 (min).
Further preferably, in the cementable sand pore-forming cementing solution of the step (4):
the curing agent is hexamethylenetetramine;
the surfactant includes: 1.0-5.0% of alkyl polyoxyethylene ether with cloud point less than or equal to 30 ℃ and 1.0-5.0% of alkyl polyoxyethylene ether with cloud point more than or equal to 100 ℃;
the acid is HCl.
Further preferably, the guide liquid for the cemented sand in the step (1) is 1.5-3.0m3Construction displacement squeeze at/min (preferably 5.0-100.0 times production speed).
Further preferably, the displacement liquid in the step (5) is oil field purification reinjection sewage, purified seawater or anti-swelling liquid.
Further preferably, the drilling and punching tool in the step (6) comprises a roller cone bit, a PDC bit or a scraper mill shoe.
More preferably, the thermal curing in the step (7) is performed at a temperature of not less than 60 ℃ for 96 hours or more.
Further preferably, the permeability of the artificial well wall obtained in the step (7) is 8 × 103-28×103mdc。
Based on the technical scheme, the specific construction process and procedures established by the invention are as follows:
(1) the sand washing well is circularly washed by a washing pipe or a drilling and grinding tool, and the well is continuously and circularly washed after reaching the bottom of the well until the well mouth returns and liquid is qualified without sand. If the positive circulation return speed can not ensure the sand washing cleanness, the reverse circulation well washing is changed to ensure no sand setting at the bottom of the well.
(2) And (4) drifting the drifting and scraping pipe to the bottom of the well by using a drifting gauge, and if the drifting is not completed, also drifting to the top boundary of the production zone or 250m above the top boundary of the production zone. And scraping any section of the well section 50-250 m above the top boundary of the production zone by using a pipe scraper, and preparing for setting the packer.
(3) Setting and testing the lower packer of the sleeve, setting and testing the sleeve, and pressing the testing sleeve to determine that the pressure bearing of the sleeve can meet the pressure required by balanced pressure and reverse circulation well washing in the sand prevention construction process.
(4) And determining whether to put in the packer according to the design construction pressure and the pressure bearing capacity of the sleeve by the lower sand control tubular column, wherein the putting-in depth is preferably 50-250 m above the top boundary of the production zone.
(5) The type and installation mode of the wellhead device are determined according to site conditions such as design construction pressure, sleeve pressure-bearing capacity, communication mode of a sand control pipe column and a sleeve and the like, the wellhead device is generally divided into installation of an oil production tree or a well plugging device (less adopted), the wellhead is usually fixed by a ground anchor, and the pressure test is qualified according to industrial regulations.
(6) The sand control ground installation process and the pressure test installation sand control construction process require that the bending degree of all joints is not less than 120 degrees, the pressure test is more than the construction pressure limit of 5.0MPa, and the pressure test is qualified according to the industrial regulations.
(7) The ground flow of installing and striking the balanced reverse circulation well washing and the technological flow of pressure test and installing the reverse circulation well washing require that the supplied liquid does not contain solid-phase impurities, the pressure test is added by 5.0MPa according to the construction pressure required to be designed for the sleeve pressure bearing and sand prevention protection oil pipe and the downhole tool, and the pressure test is qualified according to the industrial regulations.
(8) The sand control construction method is sequentially constructed according to the following 9 working procedures. Namely: 1) and (3) squeezing and injecting a cementing sand guide fluid (a pre-pretreatment near-well zone) at a high discharge and high speed. 2) Large-discharge high-speed extrusion injection of low-concentration cemented sand coupling reinforcing liquid (dispersion)Filling). 3) The sand-cementing coupling reinforcing liquid (gradient filling) with proper concentration is controlled and adjusted to be injected. 4) And controlling, adjusting and extruding a cementing liquid (sand-removing filling and sealing) with higher concentration capable of cementing sand and forming pores. 5) The displacement is controlled to squeeze the displacement liquid, so that sand can be cemented and discharged from the tubing shoes (oil field purification reinjection sewage or seawater purification or anti-swelling liquid). 6) Drilling sand flushing plug, drilling plug with PDC or roller or scraper drill grinding tool (to prevent pollution of artificial well wall). 7) And (3) finishing the artificial well wall by thermal curing, closing the well, waiting for solidification, or performing cyclic heating or chemical heat generation, wherein the temperature is not lower than 60 ℃ and is more than 96 hours. 8) And putting the production string as required. 9) Controlling the liquid discharge strength to gradually recover normal production, and controlling the liquid collection strength to be 1.0-2.0 m within 1-10 days of the initial liquid discharge period3D.m, controlling the liquid collecting strength to be 2.0-4.0 m within 11-20 days3/d.m, normal production after 20 days.
The construction process of the invention requires the following equipment: the special equipment for fracturing oil, water and gas wells in the petroleum industry executes industrial standards such as use methods, operating regulations, safety, environmental protection and the like.
It is generally required that: the discharge capacity is 0-5 m3The/min can be adjusted, and the pressure can be set to be limited within 0-100 MPa, so that the pump can be automatically stopped.
The high-permeability artificial well wall established by saturated filling overcomes the action of scouring and dragging force of production fluid on the surface of the rock edge end part, supports the rock edge end part gravel and the cementing material not to fall off from the matrix, and achieves the aim of stabilizing the well wall without sand production and collapse. The process route of passive repeated treatment of sand production and blocking and collapse blocking at present is changed, and a new technical approach is provided for solving similar problems of sand production and collapse in the future; compared with the prior art, the method mainly has the following advantages:
1. the artificial well wall is arranged outside the well (comprising a casing, a screen pipe, a fracturing pipe string and the like), no tool is left in the well after production recovery, the problem of re-salvaging the tool after mechanical sand control is avoided, and the subsequent maintenance cost is low.
2. The artificial well wall is arranged outside the well (comprising a casing, a screen pipe, a fracturing pipe string and the like), no tool is left in the well after production is recovered, sidetracking or well abandonment caused by failure of a fishing tool can be avoided, and the subsequent operation risk is low.
3. The artificial well wall can stabilize the stratum of the rock matrix and prevent sand from being produced, and the mechanical sand blocking can prevent the stratum from being unstable and continue to produce sand, and then the sand is blocked outside the barrier. The prior sand control technology is sand blocking, and the invention is used for stabilizing bedrock without producing sand. The standard of the prior art (including chemical sand control) is that the recovery capacity is more than or equal to 80 percent, and the invention achieves more than or equal to 100 percent.
4. The artificial well wall is used for stabilizing the stratum of the rock matrix without sand production, so the artificial well wall is suitable for coarse sand, medium sand, fine sand and silt sand, but the sand blocking particle size is very difficult to be smaller than 50 mu m.
5. For casing change wells, the method can be suitable as long as sand washing drift diameter can be achieved, but mechanical tools are difficult to put in place.
6. For sidetrack slim holes, the corresponding sand washing pipe column is adopted, but the running risk of mechanical tools is too large.
7. The period is long and can reach 3-10 years. The prior art generally takes 1-3 years.
8. The use temperature of the resin type cementable sand is 30-270 ℃, and the use temperature of the aluminosilicate cementable sand is 30-500 ℃. Covering substantially all of the production well temperature range.
Drawings
FIG. 1 is a schematic diagram of a sand control construction process and procedure established in accordance with the present invention;
FIG. 2 is a schematic illustration of a saturated packing of a formation in accordance with the present invention;
FIG. 3 is a schematic view of a drill plug-based artificial borehole wall according to the present invention;
FIG. 4 is a graph of sand control application in example 1;
FIG. 5 is a graph of sand control application in example 2;
in the figure: A. pump pressure curve, B discharge capacity curve, C discharge total curve, D sand ratio curve.
Detailed Description
The present invention is described in detail below by way of examples, it being understood that these examples are for illustrative purposes only and in no way limit the scope of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be within the scope of the invention.
For different complex well conditions, two well field wells are introduced, for example:
example 1
Construction well example 1: BZ34-1-A18H well (oil zone in middle oil Bohai of middle sea oil-sandstone screen horizontal well)
Referring to fig. 4, the well is initially constructed by gradually increasing the displacement to 2.6m3Min, raising the pump pressure to 13.3MPa, and cleaning pollutants by using a cemented sand guiding liquid, namely a pad fluid with large discharge capacity, wherein the cemented sand guiding liquid comprises the following components: 2.0 percent of chelating agent, 3.0 percent of surfactant, 5.0 percent of hydrochloric acid and 5.0 percent of anti-swelling agent. Wherein the chelating agent is selected from ethylenediamine tetraacetic acid or diethylenetriamine pentamethylene phosphonic acid;
the surfactant includes: 1.5% of alkyl polyoxyethylene ether with a cloud point less than or equal to 30 ℃ and 1.5% of alkyl polyoxyethylene ether with a cloud point more than or equal to 100 ℃; the anti-swelling agent is NH4 CL.
Then, coupling strengthening liquid, namely sand carrying liquid, is used for carrying cemented gravel to squeeze into a depletion zone of the stratum, and the sand ratio is controlled to be 3.0 percent, wherein the surfactant is 5.0 percent, the retention agent (sand inhibiting agent) is 5.0 percent, and the KCl is 3.0 percent. Wherein the surfactant comprises: 2.0% of alkyl polyoxyethylene ether with the cloud point less than or equal to 30 ℃ and 3.0% of alkyl polyoxyethylene ether with the cloud point more than or equal to 100 ℃; the retention agent (inhibitor) is a homopolymer or copolymer of dimethyldiallylammonium chloride with acrylamide and acrylic acid. The cementitable gravel consists of a supporting matrix and a cementing agent, and the addition amount of the cementing agent is 10% of the total weight of the cementitable gravel; the supporting substrate is made of quartz sand, and the cementing agent is made of phenolic resin.
Continuously controlling the discharge capacity to be 2.0m3And/min, adjusting the concentration of the cemented gravel to ensure that the sand ratio is gradually increased to cause the injection pressure to fluctuate in a saw-tooth shape, and when the sand ratio is continuously increased and the injection pressure is not obviously reduced, indicating that the end desanding is started and the filter-pressing artificial abrasive belt is formed, wherein the sand ratio is increased to 14 percent. Finally controlling the discharge capacity to be 1.8m3Min, carrying high concentration with pore-forming cementing liquidAnd (3) cementing gravel, wherein the sand ratio is improved to 20 percent, the curing agent is 5.0 percent (hexamethylene tetramine), the surfactant is 6.0 percent (the surfactant comprises 3.0 percent of alkyl polyoxyethylene ether with the cloud point less than or equal to 30 ℃ and 3.0 percent of alkyl polyoxyethylene ether with the cloud point more than or equal to 100 ℃), the hydrochloric acid is 1.0 percent, the lactic acid is 0.5 percent, and the anti-swelling agent is 3.0 percent, and the extrusion filling pressure is rapidly increased from 7.7MPa to 16MPa under the condition of continuously keeping high-pressure extrusion filling, so that the filling is completed in a saturated construction manner. And then the artificial well wall is finished through squeezing and injecting displacement liquid, drilling and flushing a sand plug and thermocuring.
The well is put into operation by electric pumping in 2018, 7 and 24 days later, the production is gradually recovered for early drainage, and the daily production liquid reaches 261.09m356.77 m of daily oil3(ii) a Before operation, the sand production and the production stop of the stratum are carried out, and the daily production fluid 121.32 m before the production stop314.56 m of daily oil3The technical measure exceeds the expected construction purpose.
According to the current liquid discharge condition, the liquid yield after the technical measures is greatly increased and continues to increase, and the daily oil yield reaches 56.77 m in the liquid discharge stage3And the rising trend is continuously maintained, thereby showing that the method can really solve the problem that the oil-water well stops production due to the breakage of the screen pipe of the middle sea oil horizontal well.
Example 2
Construction well example 2: YM2-22 well (Medium petroleum Tarim oil-Yili oil district-limestone open hole vertical well)
Referring to FIG. 5, the well was initially constructed by gradually increasing the displacement to 2.7m3And/min, raising the pump pressure to 25MPa, and cleaning pollutants by using a cementing sand guide liquid, namely a pad liquid with large discharge capacity, wherein the chelating agent is 1.5 percent, the surfactant is 3.0 percent, the hydrochloric acid is 7.0 percent, and the anti-swelling agent is 2.50 percent. Wherein the chelating agent is selected from ethylenediamine tetraacetic acid or diethylenetriamine pentamethylene phosphonic acid; the surfactant includes: 1.5% of alkyl polyoxyethylene ether with a cloud point less than or equal to 30 ℃ and 1.5% of alkyl polyoxyethylene ether with a cloud point more than or equal to 100 ℃; the anti-swelling agent is NH4 CL.
Then, coupling strengthening liquid, namely sand carrying liquid, is used for carrying cemented gravel to squeeze into a depletion zone of the stratum, and the sand ratio is controlled to be 3.0 percent, wherein the sand ratio is 2.5 percent of surfactant, 3.0 percent of retention agent (sand inhibitor) and 2.0 percent of KCl. Wherein the surfactant comprises: 1% of alkyl polyoxyethylene ether with cloud point less than or equal to 30 ℃ and 1.5% of alkyl polyoxyethylene ether with cloud point more than or equal to 100 ℃; the retention agent (inhibitor) is a homopolymer or copolymer of dimethyldiallylammonium chloride with acrylamide and acrylic acid. The cementitable gravel consists of a supporting matrix and a cementing agent, and the addition amount of the cementing agent is 10% of the total weight of the cementitable gravel; the supporting substrate is made of quartz sand, and the cementing agent is made of phenolic resin.
Continuously controlling the discharge capacity to be 2.3m3And/min, adjusting the concentration of the cemented gravel to ensure that the sand ratio is gradually increased to cause the injection pressure to fluctuate in a saw-tooth shape, and when the sand ratio is continuously increased and the injection pressure slowly rises, indicating that the end desanding and the formation of the filter-pressing artificial abrasive belt are started, wherein the sand ratio is increased to 10 percent. Finally reducing the discharge capacity to 1.0m3And/min, carrying high-concentration cementible gravel by using pore-forming cementing liquid, wherein the sand ratio is improved to 15 percent, and 8.0 percent of curing agent (hexamethylene tetramine), 2.0 percent of surfactant, 2.5 percent of hydrochloric acid, 0.5 percent of lactic acid and 1.0 percent of anti-swelling agent are added. Under the condition of continuously keeping high-pressure extrusion and injection, the extrusion and filling pressure is quickly increased to 28MPa, namely the construction upper limit pressure, which indicates that the filling is fully completed. And then the artificial well wall is finished through squeezing and injecting displacement liquid, drilling and flushing a sand plug and thermocuring.
After the well is operated, the production is carried out by pumping by a pipe pump at 18 days 4 and 4 months in 2017, the current production is self-injection production, and the daily production liquid is 26t and the oil content is 26 t; the production of the electric pump is carried out before operation, the daily liquid production is 29t, and the oil content is 24t, which exceeds the expected construction purpose.
The successful application of the open hole well wall repairing technology has very obvious effects on open hole well sand production treatment and well wall collapse repair, and provides valuable experience for the Tarim oil field natural gas industry department and even oil field open hole well sand production treatment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and are not limited, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art are included in the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A method for manufacturing an artificial well wall by saturated filling of cemented gravel around a well hole is characterized by comprising the following steps:
(1) firstly, squeezing and injecting a preposed cemented sand guide fluid into a well hole by adopting large discharge capacity, pressing open or acidizing or flushing a target void stratum, flushing a directly manufactured filling space or a filling space formed under high pressure difference and an existing filling space in the production process, and pushing away pollutants to a far well zone so as to achieve the effect that the pollutants are not carried by low-speed fluid enough to move after recovery production; the weight percentage of each component in the cemented sand guiding liquid is as follows:
0.5 to 5.0 percent of chelating agent,
2.0 to 10.0 percent of surfactant,
4 to 15 percent of acid,
2.0 to 5.0 percent of anti-swelling agent or clay stabilizer,
the balance of water;
wherein:
the chelating agent is EDTA series or amino methylene phosphate series;
the surfactant polyoxyethylene series, the amino carboxylic acid and the salt series thereof, the amino alkyl sulfonic acid and the salt series thereof or the amphoteric active agent series;
the acid is one or a combination of more of HCl, HF, acetic acid, lactic acid, amino alkyl phosphoric acid and amino alkyl sulfonic acid;
the anti-swelling agent or clay stabilizer is NH4Cl, KCl, quaternary ammonium salt series or quaternary phosphonium salt series;
(2) then, cementing sand coupling reinforcing liquid which is added with cementing gravel is squeezed into the well hole, pollutants are carried and retained in a far well zone, the pollutants are prevented from being transported and stacked to a near well zone after production, and the sand ratio in the cementing sand coupling reinforcing liquid is controlled to be 3-10%; the weight percentage of each component in the consolidated sand coupling reinforcing liquid is as follows:
2.0 to 10.0 percent of surfactant,
2.0 to 6.0 percent of retention agent,
KCl 2.0-3.0%
the balance of water;
wherein:
the surfactant is a distyryl polyoxyethylene ether series, an alkylphenol polyoxyethylene ether series, a high-carbon fatty alcohol polyoxyethylene ether series or an ethylene oxide addition product series of polypropylene glycol;
the retention agent is a copolymer series of dimethyl diallyl ammonium chloride and acrylamide and acrylic acid water-soluble monomers, a copolymer series of dimethyl diallyl ammonium chloride and acrylic acid and styrene amphiphilic monomers, a polycondensate series of epichlorohydrin and organic amine or a polycondensate series of alkyl halide and organic amine;
(3) secondly, adding the cementable gravel into the cementable sand coupling reinforcing liquid and then continuously squeezing and injecting the cementable gravel into the well hole, wherein the sand ratio in the cementable sand coupling reinforcing liquid is controlled to be 8-30%, so that spaces with different bearing capacities are sequentially filled according to the rise of pressure, and the bearing capacity of the filled spaces is gradually improved;
(4) then, continuously filling the pore-forming cementing liquid of the cementable sand added with the cementable sand, wherein the sand ratio in the pore-forming cementing liquid of the cementable sand is controlled to be 15-40%, the space is sequentially saturated, the cementable gravel is filtered to a shaft, and the filling construction is finished when the sand is buried to a non-sand-sucking well section; the cementing sand pore-forming cementing liquid comprises the following components in percentage by weight:
1 to 10 percent of curing agent,
2.0 to 10.0 percent of surfactant,
acid 1.0-3.0%, except HF and HBF4，
1.0 to 3.0 percent of anti-swelling agent or clay stabilizer,
the balance of water;
wherein:
the curing agent is hexamethylenetetramine, formaldehyde, furfural, urea resin series, thermosetting phenolic resin series or epoxy resin series;
the surfactant is a distyryl polyoxyethylene series, an alkylphenol polyoxyethylene ether series, a high-carbon fatty alcohol polyoxyethylene ether series, and an ethylene oxide addition product series of polypropylene glycol;
the acid is one or a combination of more of HCl, acetic acid, lactic acid, amino alkyl phosphoric acid or amino alkyl sulfonic acid;
the anti-swelling agent or clay stabilizer is NH4CL, KCl, quaternary ammonium salt series or quaternary phosphonium salt series;
the cementable gravel in the steps (2), (3) and (4) consists of a supporting matrix and a cementing agent, and the addition amount of the cementing agent is 7-12% of the total weight of the cementable gravel; the supporting matrix comprises one or more of quartz sand, ceramsite sand and hardened cement particles, and the cementing agent is one or more of phenolic resin, epoxy resin, furfural resin, amino resin and unsaturated resin;
(5) then, squeezing and injecting displacement fluid into the well hole to ensure that sand can be cemented and the tubing shoe can be discharged;
(6) then, drilling a flushing plug to the bottom of the well by using a drilling and flushing tool, and fully and circularly flushing the well until the returned liquid is free of pollutants;
(7) and finally, closing the well and waiting for coagulation or circularly heating or chemically heating and thermally curing to finish the artificial well wall.
2. The method of claim 1, wherein the step (1) of saturating the perimeter of the well with the cemented gravel produces an artificial borehole wall, wherein:
the chelating agent is ethylenediamine tetraacetic acid or diethylenetriamine pentamethylene phosphonic acid;
the surfactant includes: 1.0-5.0% of alkyl polyoxyethylene ether with cloud point less than or equal to 30 ℃ and 1.0-5.0% of alkyl polyoxyethylene ether with cloud point more than or equal to 100 ℃;
the acid comprises: 0.5-3.0% of HF, 3.0-10.0% of HCl and 0.5-2.0% of lactic acid.
3. The method for manufacturing an artificial borehole wall by saturated packing of cemented gravel around a borehole according to claim 1, wherein the step (2) of cementing sand coupling the strengthening liquid comprises the following steps:
the surfactant includes: 1.0-5.0% of alkyl polyoxyethylene ether with cloud point less than or equal to 30 ℃ and 1.0-5.0% of alkyl polyoxyethylene ether with cloud point more than or equal to 100 ℃;
the retention agent is homopolymer or copolymer of dimethyl diallyl ammonium chloride, acrylamide and acrylic acid monomer.
4. The method for manufacturing the artificial well wall by saturated packing of the cemented gravel around the well hole according to claim 1, wherein the cemented gravel is a cemented gravel containing a short-acting diverting agent which is pyromellitic dianhydride or naphthalene formate, and the diverting effective time Tx = 5 or 8 or 10 min.
5. The method for manufacturing the artificial well wall by saturated-packing the cementable gravel at the periphery of the well hole according to the claim 1, characterized in that in the cementable sand pore-forming cementing liquid of the step (4):
the curing agent is hexamethylenetetramine;
the surfactant includes: 1.0-5.0% of alkyl polyoxyethylene ether with cloud point less than or equal to 30 ℃ and 1.0-5.0% of alkyl polyoxyethylene ether with cloud point more than or equal to 100 ℃;
the acid is HCl.
6. The method for manufacturing an artificial borehole wall by saturated-packing cemented gravel around a borehole according to claim 1, wherein the cementing sand guiding fluid in the step (1) is 1.5-3.0m3And/min construction displacement extrusion.
7. The method for manufacturing the artificial well wall by saturated-packing the cementible gravel at the periphery of the well hole according to the claim 1, wherein the displacement liquid in the step (5) is oil field purification reinjection sewage, purified seawater or anti-swelling liquid.
8. The method of claim 1, wherein the drilling and percussion tool of step (6) comprises roller cone drill bit, PDC drill bit or drag shoe.
9. The method for manufacturing the artificial borehole wall by saturated-packing the cemented gravel around the borehole according to claim 1, wherein the thermal curing in the step (7) is performed at 60 ℃ or higher and for 96 hours or more.
10. The method of claim 1, wherein the step (7) results in an artificial well wall having a permeability of 8 x 103-28×103mdc。
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