CN116063992A - Plugging composition utilizing oil-based drilling cuttings and application method thereof - Google Patents
Plugging composition utilizing oil-based drilling cuttings and application method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 claims abstract description 44
- 239000013305 flexible fiber Substances 0.000 claims abstract description 19
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- 239000002783 friction material Substances 0.000 claims abstract description 16
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- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 16
- 238000005086 pumping Methods 0.000 claims description 16
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- 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The application provides a plugging composition utilizing oil-based drilling cuttings and an application method thereof, wherein a plugging formula comprises the following components in parts by weight: 40-50 parts of oil-based drill cuttings; 15-25 parts of lipophilic deformation material; 5-10 parts of flexible fiber; 25-35 parts of irregular high friction material. The oil-based drilling cuttings are crushed, the grain diameter is smaller than 3mm, and the 1mm screen residue is not more than 50%; the oil-based drilling fluid has good matching property with stratum physical properties, excellent compatibility with oil-based drilling fluid and good plugging property. The invention utilizes the characteristics of good matching property between the oil-based drilling cuttings and stratum physical properties, strong lipophilicity, good structural strength and the like, and takes the oil-based drilling cuttings as a main plugging material, thereby forming a plugging formula with good compatibility with oil-based drilling fluid and good adaptation of a plugging layer. The plugging application of the invention not only saves plugging materials, but also reduces the environmental protection pressure of oil-based drilling cuttings treatment, solves the problem of oil-based drilling fluid leakage, and can realize the purposes of recycling and harmless utilization of the oil-based drilling cuttings.
Description
Technical Field
The application belongs to the technical field of well drilling plugging, relates to a plugging composition utilizing oil-based drilling cuttings and an application method thereof, and in particular relates to a plugging formula for recycling oil-based drilling cuttings and an application method thereof.
Background
With the continuous deep development of the shale gas exploration in the southwest industrial area, the problem of oil-based drilling fluid leakage of complex stratum is increasingly outstanding, lost circulation treatment efficiency is low, a large amount of plugging materials and drilling fluid are wasted, and the comprehensive drilling cost is increased. When the lost circulation is serious, even drilling can not be performed, the casing pipe is forced to be put down in advance or the side drilling is forced to be performed in a filling way, and the speed and the efficiency of drilling in the southwest work area are seriously restricted.
Aiming at the problem of oil-based drilling fluid leakage, the on-site treatment means is limited, and the main materials for conventional leakage blocking are calcium carbonate particles, walnut shells, cotton fibers, hydrophilic plugging agents while drilling and the like. Because of the strong leakage of oil-based drilling fluid, the conventional plugging material cannot form a compact plugging layer in a crack, is easily influenced by the fluctuation pressure of a well bore and is easily damaged by the cyclic erosion of the drilling fluid, and repeated leakage occurs. In addition, a large amount of oil-based drilling cuttings are generated in the drilling process of the oil-based drilling fluid, the oil-based drilling cuttings belong to dangerous wastes (national hazardous waste catalogue, HW 08), the local ecological environment and human health can be influenced in the transportation, transfer and treatment processes, the treatment conditions are harsh, and the environmental protection treatment cost is high.
Although the domestic research on the treatment of the oil-based drilling cuttings is more, the treatment is mainly stopped at an indoor experimental stage, the harmless treatment and recycling application of the oil-based drilling cuttings are less or the cost is high, and the method is not suitable for popularization in a drilling site.
Disclosure of Invention
In order to solve the problem of oil-based drilling fluid leakage and the problem of oil-based drilling cuttings environmental protection treatment, the application provides a plugging composition utilizing oil-based drilling cuttings and an application method thereof.
The invention provides a plugging composition utilizing oil-based drilling cuttings, which comprises the following components in parts by weight:
40-50 parts of oil-based drilling cuttings;
15-25 parts of lipophilic deformation material;
5-10 parts of flexible fiber;
25-35 parts of irregular high friction material;
the oil-based drilling cuttings are crushed particles, the particle size is smaller than 3mm, and the 1mm screen residue is not more than 50%.
In a preferred embodiment of the present invention, the oleophilic deformable material is asphalt powder with a particle size of 0.5-1 mm and a softening point of 60-80 ℃.
In a preferred embodiment of the invention, the flexible fibers are silicate fibers or polymer fibers, with a length of 1-3 mm.
In the preferred embodiment of the invention, the irregular high friction material is oyster shell powder or shell powder, and the standard sample separation sieve is 40-120 meshes.
The embodiment of the invention provides an application method of a plugging composition, which comprises the following steps:
preparing a plugging slurry by adopting the plugging composition;
mainly aims at the leakage speed of not more than 20m 3 And (3) carrying out crack leakage at/h, drilling to 50-100 m above a leakage layer, and pumping the leakage blocking slurry to block leakage.
In some embodiments of the invention, the leakage rate is not more than 10m 3 Per h of the fractured slurryThe concentration is 15% -20%.
In a preferred embodiment of the present invention, the plugging slurry further comprises, prior to being pumped in: and (3) drilling down to 25-50 m below the leakage layer, and cleaning the leakage layer by adopting 15L/s circulation of discharge capacity.
In other embodiments of the invention, the leakage rate is between 10 and 20m 3 And/h of crack leakage, wherein the concentration of the plugging slurry is 30-35%.
Some existing methods for treating oil-based drill cuttings burn the oil-based drill cuttings, but the burning method can cause certain environmental pollution because the oil-based drill cuttings contain volatile, toxic and other complex components; still other prior art techniques require complex procedures for environmentally friendly treatment of oil-based drill cuttings prior to their use.
Compared with the prior art, the invention introduces a plugging formula for recycling oil-based drilling cuttings and an application method thereof, and the plugging formula composition comprises the following components in parts by weight: 40-50 parts of oil-based drilling cuttings; 15-25 parts of lipophilic deformation material; 5-10 parts of flexible fiber; 25-35 parts of irregular high friction resistance material. In the invention, the oil-based drilling cuttings are processed by returning and crushing a vibrating screen in the drilling process of oil-based drilling fluid, the grain diameter is smaller than 3mm, and the screen residue of 1mm is not more than 50%; the oil-based drilling fluid has good matching property with stratum physical properties, excellent compatibility with oil-based drilling fluid and good plugging property. The invention utilizes the characteristics of good matching property between the oil-based drilling cuttings and stratum physical properties, strong lipophilicity, good structural strength and the like, and takes the oil-based drilling cuttings as a main plugging material, thereby forming a plugging formula with good compatibility with oil-based drilling fluid and good adaptation of a plugging layer. The invention utilizes the plugging composition of the oil-based drilling cuttings to perform plugging application, not only saves plugging materials, but also reduces the environmental protection pressure of oil-based drilling cuttings treatment, solves the problem of oil-based drilling fluid leakage, can realize the purposes of recycling and harmless utilization of the oil-based drilling cuttings, and has wide popularization and application prospects.
Drawings
FIG. 1 is a schematic diagram of the experimental apparatus used for performing the plugging in the indoor simulation of examples 1-4.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully, and it is apparent that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The application provides a plugging composition utilizing oil-based drilling cuttings, which comprises the following components in parts by weight:
40-50 parts of oil-based drilling cuttings;
15-25 parts of lipophilic deformation material;
5-10 parts of flexible fiber;
25-35 parts of irregular high friction material;
the oil-based drilling cuttings are crushed particles, the particle size is smaller than 3mm, and the 1mm screen residue is not more than 50%.
The plugging formula for recycling the oil-based drilling cuttings has the advantages of good compatibility with oil-based drilling fluid, high bearing pressure, stable plugging layer and the like, and the application method is safe and efficient, and effectively solves the problems of oil-based drilling cuttings treatment and the like.
According to parts by weight, the plugging formula (which can be called plugging agent and plugging composition) disclosed by the embodiment of the invention comprises 40-50 parts of oil-based drilling cuttings, such as 40 parts, 45 parts and 50 parts; the oil-based drilling fluid is subjected to return of a vibrating screen and crushing treatment in the drilling process of the oil-based drilling fluid, the particle size of oil-based drilling fluid particles is smaller than 3mm, and the screen residue of 1mm is not more than 50%. The particle size is too large, so that the particles are easy to settle and accumulate in the plugging process, and risks such as water hole plugging and drill sticking are caused, particularly in inclined shaft sections and horizontal sections; on the other hand, the oil-based drilling fluid is applied to development of micro-cracks of stratum micropores, the size of the cracks measured by an instrument under static state is generally smaller than 1mm, the size of the cracks is difficult to exceed 2mm even under dynamic state, and the particle size is too large to enter a leakage layer resident plugging.
Compositionally, oil-based drill cuttings mainly comprise diesel oil, a small amount of water, rock particles, drilling fluid treatments, etc., with oil content typically 10% -20%. According to the research, as the oil-based drilling cuttings come from the stratum and have good matching property with physical properties of the stratum, and secondly, the oil-based drilling cuttings and the oil-based drilling fluid are excellent in compatibility, the oil-based drilling fluid can be used as an oil-based drilling fluid plugging material, and the plugging performance is good. In addition, the source is wide, and special treatment is not needed for preparing the plugging slurry.
In the embodiment of the invention, the plugging formula comprises 25-35 parts by weight of irregular high friction material, which can be 25 parts, 30 parts, 35 parts and the like. The irregular high friction material is in a granular or flaky shape, generally has a wide range of various particle sizes and multiple forms (particles, flakes and the like on the macro scale), has a rough surface, has high flow resistance in drilling fluid and is easy to reside in a leakage layer. The irregular high-friction material is preferably shell powder or oyster shell powder with 40-120 meshes of a standard sample separation sieve, has good dispersibility in plugging slurry and stable physicochemical property, is easy to turn over and clamp throat along with the flowing of drilling fluid in a leakage channel, and has excellent residence property.
The plugging agent provided by the embodiment of the invention comprises 15-25 parts by weight of lipophilic deformation material, preferably 18-25 parts by weight; the component material is lipophilic and can generate certain morphological change according to temperature. In the preferred embodiment of the invention, the oleophilic deformation material is asphalt powder with the particle size of 0.5 mm-1 mm and the softening point of 60 ℃ or 80 ℃; before the softening point is reached, the asphalt particles can be developed into particles with certain elasticity, the deformation blocking capability is strong, and gaps or pores formed by bridging blocking can be filled, so that the asphalt particles are densely blocked. When applied on site, the lipophilic deforming material belongs to asphalt powder with best effect, economy and wide sources. At a certain temperature, the non-softened part of the asphalt powder has the same function as rigid particles with the same particle size; the softened part has cohesiveness and deformability, and can squeeze into micropore microcracks or further reduce the permeability of the plugging layer by deformation, so that the plugging layer and the well wall are adhered into a whole, and the bearing capacity of the stratum of the leakage layer is improved.
The plugging agent provided by the embodiment of the invention comprises 5-10 parts by weight of flexible fibers, wherein the flexibility of the flexible fiber material is relative to rigid particles such as calcium carbonate, and the length of the fibers is 1-3 mm. In a specific embodiment of the invention, the flexible fibers are silicate fibers or polymer fibers, preferably silicate fibers, having a length of 1-3 mm; the polymer fibers include, but are not limited to, polyester fibers and the like. In the formula system, the flexible fiber material is formed into clusters after being wound and captured by forming a net, so that the residence capacity of the plugging slurry is improved, the plugging layer is participated in forming, the toughness of the plugging layer is improved, and the structural strength of the plugging layer is improved.
The invention has no special limitation on sources such as flexible fiber, lipophilic deformation material and the like, and can be used by adopting commercial products. The plugging formula based on the oil-based drilling cuttings provided by the embodiment of the invention has good compatibility with the oil-based drilling fluid, strong adaptability to a leakage layer and synergistic effect of various materials, can effectively reside and accumulate in cracks soaked by the oil-based drilling fluid, forms a compact plugging layer with low permeability and high strength, and reduces the occurrence rate of repeated leakage.
The plugging agent disclosed by the embodiment of the invention has good compatibility with oil-based drilling fluid and stable performance. According to the invention, the oil-based drilling cuttings generated in the drilling process of the oil-based drilling fluid can be subjected to crushing treatment, so that the oil-based drilling fluid can be recycled, and the section plugging slurry based on the oil-based drilling cuttings is prepared for plugging cracks, so that the cracks can be timely plugged, the leakage of the oil-based drilling fluid is reduced, the plugging material and the environmental-friendly treatment cost of the oil-based drilling fluid are saved, the leakage problem of the oil-based drilling fluid is safely and efficiently solved, and the green development of oil-gas exploration and development is ensured.
Accordingly, the embodiment of the invention provides an application method of the plugging composition, which comprises the following steps:
preparing a plugging slurry by adopting the plugging composition;
mainly aims at the leakage speed of not more than 20m 3 And (3) carrying out crack leakage at/h, drilling to 50-100 m above a leakage layer, and pumping the leakage blocking slurry to block leakage.
Specifically, the application method of the embodiment of the invention comprises the following steps:
(1) The leak speed is 0-10 m 3 /h；
(1) Preparing a plugging slurry: the concentration is 15-20%, the slurry quantity is 15-20 m 3 . According to the requirements, sequentially adding oil-based drill cuttings, irregular high-friction material, flexible fiber and oleophilic deformation material with preset amounts, and stirring for 30min to obtain the oil-based drillPlug plugging slurry of scraps;
the oil-based drilling fluid generally comprises diesel oil, 20% calcium chloride aqueous solution, organic soil, main and auxiliary emulsion, filtrate reducer and the like, and is prepared by adopting the common method in the field.
The on-site calculation mode of the concentration is 20m 3 The concentration of the plugging material added into the drilling fluid is 25%, so that the on-site operation is convenient, and the working efficiency is improved.
(2) A simplified drilling tool assembly (a roller bit and a conventional drilling tool) is drilled, the drilling tool assembly is drilled down to 25-50 m below a leakage layer, the leakage layer is cleaned by adopting 15L/s circulation of displacement, and favorable conditions are provided for plugging materials to enter the leakage layer;
(3) pumping 50-100 m above the leakage layer, pumping leakage blocking slurry into a 10L/s displacement pump, increasing the discharge capacity to 15L/s after the leakage blocking slurry is discharged out of a water hole, pumping 200-300 m above the theoretical leakage blocking slurry surface after the internal and external theory of a leakage blocking slurry drilling tool is leveled, and pumping on, wherein the discharge capacity is 20L/s, and circulating for 1-2 weeks;
(4) stopping the pump, stopping the leakage for 8-10 h, drilling to the bottom, starting the pump at the discharge capacity of 10L/s, gradually increasing to the normal drilling discharge capacity, and after cleaning the shaft leakage stopping material, circulating for 1 week, and if the leakage stopping is successful.
(2) The leakage speed is 10-20 m 3 /h；
(1) Preparing a plugging slurry: the concentration is 30-35%, the slurry amount is 25-30 m 3 . According to the requirements, sequentially adding oil-based drilling cuttings, irregular high-friction materials, flexible fibers and lipophilic deformation materials in preset quantities, and stirring for 30min to obtain section plugging slurry based on the oil-based drilling cuttings;
(2) a simplified drilling tool assembly (optical drill rod) is drilled, and the drilling tool assembly is drilled down to 50-100 m above the leakage layer;
(3) pumping the plugging slurry into a 10L/s displacement pump, after the plugging slurry is completely discharged out of the drilling tool, drilling to a safe well section above the surface of the plugging slurry, continuously extruding the plugging slurry by adopting 10L/s, recording the relation between the casing pressure and the extrusion quantity, controlling the extrusion quantity not to exceed 1/2 of the plugging slurry quantity, and starting the well and drilling until the inside of the casing is stopped and plugged for 24 hours after the extrusion is finished;
(4) and drilling to the bottom, starting a pump at the discharge capacity of 10L/s, gradually increasing the normal drilling discharge capacity, cleaning the plugging material of the shaft, and then circulating for 1 week, wherein plugging is successful if the plugging is not leaked.
According to stratum physical properties and leakage characteristics, the embodiment of the invention establishes a matched plugging application method, ensures underground safety through scientific guidance and fine construction, effectively ensures the plugging success rate, and is favorable for popularization in a work area.
For further understanding of the present application, a plugging formulation for recycling oil-based drill cuttings and a method for applying the same provided herein are specifically described below with reference to examples.
Oil-based drilling fluid properties: density 1.29g/cm 3 Viscosity 74s, apparent viscosity 37.5MPa.s, plastic viscosity 31MPa.s; dynamic shearing force is 6.5Pa, initial shearing force is 3/5Pa, high temperature and high pressure are 1mL (120 ℃), and demulsification voltage is high: 515V, 20% solids, 80% oil/water: 20.
the following experimental examples 1-4 were carried out in an indoor simulation, and the experimental apparatus is shown in fig. 1, and the application method is combined with practice and amplified equally for better fitting to the site. If the field is 50m below the leakage layer, the room is 5cm below the simulated shaft leakage layer.
In fig. 1: 1-an infinitely variable pump; 2-a pressure sensor; 3-a pump flush regulator; 4-a pressure release valve; 5-a control valve; 6-displacement slurry vessel; 7-high pressure line; 8-adapter; 9-steel feeding cover; 10-a plugging slurry container; 11-drill pipe joint; 12-small drill rods; 13-wellbore simulation vessel; 14-lower steel cover; 15-upper simulation leakage sleeve; 16-lower simulated leakage sleeve; 17-plugging; 18 with ball valve plug.
The operation process comprises the following steps: firstly, loading a crack block into an upper (lower) leakage layer sleeve, simulating single-point crack leakage, tightening a plug with a ball valve, closing the ball valve, and tightening the lower (upper) leakage layer sleeve by using the plug; tightening the lower steel cover and closing the valve; before the plugging slurry container is connected and fastened with the well bore simulation container, the lower end of the plugging slurry container is connected with a simulation small drill rod with a certain length; filling oil-based drilling fluid into a shaft simulation container, filling prepared plugging slurry into the plugging slurry container, tightening a steel cover, and connecting and fixing a high-pressure pipeline with an adapter; the displacement slurry container is filled with oil-based drilling fluid, one end of the displacement slurry container is connected with a high-pressure pipeline, and the other end of the displacement slurry container is connected with a stepless speed change pump; and finally, opening a valve of the ball valve plug to perform a plugging simulation test. After the test is finished, the pressure release valve should be opened first to ensure safety.
Example 1
The plugging formula comprises the following components in parts by weight: 40 parts of oil-based drilling cuttings, 25 parts of asphalt powder with a softening point of 60 ℃,10 parts of silicate fibers and 25 parts of shell powder;
the particle size of the oil-based drilling cuttings particles is less than 3mm, and the 1mm screen residue is not more than 50%; standard sample separating sieve for shell powder 40-120 mesh; the particle size of the asphalt powder particles is 0.5 mm-1 mm; silicate fiber length is 1-3 mm.
The application method comprises the following steps:
leakage speed 9m 3 /h；
(1) And (3) preparing plugging slurry: concentration is 20%, slurry quantity is 20m 3 . According to the requirements, sequentially adding oil-based drilling cuttings, irregular high-friction materials, flexible fibers and lipophilic deformation materials in preset quantities, and stirring for 30min to obtain segment plugging slurry;
(2) a simplified drilling tool assembly (a roller bit and a conventional drilling tool) is drilled, the drilling tool assembly is drilled down to 50m below a leakage layer, and the leakage layer is cleaned by adopting 15L/s circulation of displacement;
(3) pumping the plugging slurry to a position 100m above the leakage layer with a discharge capacity of 10L/s, increasing the discharge capacity to 15L/s after the plugging slurry is discharged out of the water hole, lifting the plugging slurry drilling tool to a position 300m above the theoretical plugging slurry surface after the internal and external theories of the plugging slurry drilling tool are leveled, and starting the pump with a discharge capacity of 20L/s for 2 weeks;
(4) stopping the pump, stopping the leakage for 10 hours, drilling to the bottom, starting the pump at the discharge capacity of 10L/s, gradually increasing the discharge capacity to the normal drilling discharge capacity, and after cleaning the leakage blocking material of the shaft, circulating for 1 week, so that the leakage blocking is successful.
Example 2
The plugging formula comprises the following components in parts by weight: 50 parts of oil-based drilling cuttings, 15 parts of asphalt powder with a softening point of 80 ℃,5 parts of silicate fibers and 30 parts of shell powder;
the particle size of the oil-based drilling cuttings particles is less than 3mm, and the 1mm screen residue is not more than 50%; standard sample separating sieve for shell powder 40-120 mesh; the particle size of the asphalt powder particles is 0.5 mm-1 mm; silicate fiber length is 1-3 mm.
The application method comprises the following steps:
leakage speed 12m 3 /h；
(1) And (3) preparing plugging slurry: concentration is 30%, slurry quantity is 25m 3 . According to the requirements, sequentially adding oil-based drilling cuttings, irregular high-friction materials, flexible fibers and lipophilic deformation materials in preset quantities, and stirring for 30min to obtain segment plugging slurry;
(2) a simplified drilling tool assembly (optical drill rod) is drilled, and the drilling tool assembly is drilled down to 50m above the leakage layer;
(3) pumping plugging slurry with the discharge capacity of 10L/s, after the plugging slurry is completely discharged from the drilling tool, drilling to a safe well section above the surface of the plugging slurry, continuously extruding and injecting by adopting 10L/s, recording the relation between the casing pressure and the remembering amount, controlling the extruding amount not to exceed 1/2 of the plugging slurry amount, and after the extruding and injecting, starting the well, and drilling to the casing for static plugging for 24 hours;
(4) and drilling to the bottom, starting a pump with the discharge capacity of 10L/s, gradually increasing the normal drilling discharge capacity, cleaning the plugging material of the shaft, and circulating for 1 week, wherein plugging is successful.
Example 3
The plugging formula comprises the following components in parts by weight: 45 parts of oil-based drilling cuttings, 25 parts of asphalt powder with a softening point of 80 ℃,10 parts of silicate fibers and 20 parts of shell powder;
the particle size of the oil-based drilling cuttings particles is less than 3mm, and the 1mm screen residue is not more than 50%; standard sample separating sieve for shell powder 40-120 mesh; the particle size of the asphalt powder particles is 0.5 mm-1 mm; silicate fiber length is 1-3 mm.
The application method comprises the following steps:
leakage speed 3m 3 /h；
(1) And (3) preparing plugging slurry: concentration is 15%, slurry quantity is 15m 3 . According to the requirements, sequentially adding oil-based drilling cuttings, irregular high-friction materials, flexible fibers and lipophilic deformation materials in preset quantities, and stirring for 30min to obtain segment plugging slurry;
(2) a simplified drilling tool assembly (a roller bit and a conventional drilling tool) is drilled, the drilling tool assembly is drilled down to 25m below a leakage layer, and the leakage layer is cleaned by adopting 15L/s circulation of displacement;
(3) pumping the plugging slurry to a position 50m above the leakage layer with a discharge capacity of 10L/s, increasing the discharge capacity to 15L/s after the plugging slurry is discharged out of the water hole, lifting the plugging slurry drilling tool to a position 200m above the theoretical plugging slurry surface after the internal and external theories of the plugging slurry drilling tool are leveled, and starting the pump with a discharge capacity of 20L/s for 1-2 weeks;
(4) stopping the pump, stopping the leakage for 8 hours, drilling to the bottom, starting the pump at the discharge capacity of 10L/s, gradually increasing the discharge capacity to the normal drilling discharge capacity, and after cleaning the leakage blocking material of the shaft, circulating for 1 week, so that the leakage blocking is successful.
Example 4
The plugging formula comprises the following components in parts by weight: 45 parts of oil-based drilling cuttings, 20 parts of asphalt powder with a softening point of 60 ℃,5 parts of silicate fibers and 30 parts of shell powder;
the particle size of the oil-based drilling cuttings particles is less than 3mm, and the 1mm screen residue is not more than 50%; standard sample separating sieve for shell powder 40-120 mesh; the particle size of the asphalt powder particles is 0.5 mm-1 mm; silicate fiber length is 1-3 mm.
The application method comprises the following steps:
leakage rate 18m 3 /h；
(1) And (3) preparing plugging slurry: concentration is 35%, slurry quantity is 30m 3 . According to the requirements, sequentially adding oil-based drilling cuttings, irregular high-friction materials, flexible fibers and lipophilic deformation materials in preset quantities, and stirring for 30min to obtain segment plugging slurry;
(2) a simplified drilling tool assembly (optical drill rod) is drilled, and the drilling tool assembly is drilled downwards to 100m above the leakage layer;
(3) pumping plugging slurry with the discharge capacity of 10L/s, after the plugging slurry is completely discharged from the drilling tool, drilling to a safe well section above the surface of the plugging slurry, continuously extruding and injecting by adopting 10L/s, recording the relation between the casing pressure and the remembering amount, controlling the extruding amount not to exceed 1/2 of the plugging slurry amount, and after the extruding and injecting, starting the well, and drilling to the casing for static plugging for 24 hours;
(4) and drilling to the bottom, starting a pump with the discharge capacity of 10L/s, gradually increasing the normal drilling discharge capacity, cleaning the plugging material of the shaft, and circulating for 1 week, wherein plugging is successful.
Comparative example 1
The plugging formula comprises the following components in parts by weight: 45 parts of calcite, 20 parts of asphalt powder with a softening point of 60 ℃,5 parts of silicate fiber and 30 parts of shell powder;
the particle size of calcite particles is smaller than 3mm, and the screen residue of 1mm is 40%; standard sample separating sieve for shell powder 40-120 mesh; the particle size of the asphalt powder particles is 0.5 mm-1 mm; silicate fiber length is 1-3 mm.
The laboratory application method is as follows:
leakage rate of 10.8m 3 /h；
(1) And (3) preparing plugging slurry: concentration is 35%, slurry quantity is 30m 3 . According to the requirements, adding calcite, irregular high friction resistance material, flexible fiber and oleophilic deformation material in a preset amount in sequence, and stirring for 30min to obtain segment plugging slurry;
(2) a simplified drilling tool assembly (optical drill rod) is drilled, and the drilling tool assembly is drilled downwards to 100m above the leakage layer;
(3) pumping plugging slurry with the discharge capacity of 10L/s, after the plugging slurry is completely discharged from the drilling tool, drilling to a safe well section above the surface of the plugging slurry, continuously extruding and injecting by adopting 10L/s, recording the relation between the casing pressure and the remembering amount, controlling the extruding amount not to exceed 1/2 of the plugging slurry amount, and after the extruding and injecting, starting the well, and drilling to the casing for static plugging for 24 hours;
(4) drilling to the bottom, pumping at a discharge capacity of 10L/s, gradually increasing to a normal drilling discharge capacity, preventing leakage, and after circulation for 1 week, generating leakage with a leakage speed of 2m 3 /h。
Example 5 field application
The southwest work area coke page X well is a development horizontal well with a structure of Jiao Danba anticline Jiao Danba of Shandong high-steep fold belt package, which is deployed in the southeast area of Chuandong by China, which is a limited company for the exploration and development of the Fuling shale gas of China. Three-open oil-based drilling fluid is compositely drilled until 3142.54m is drilled, lost circulation occurs, and the average lost circulation speed measured by drilling tool lifting and encryption is 13.8m 3 And (h) preparing oil-based drilling cuttings plugging slurry. Drilling fluid properties: density 1.37g/cm 3 Viscosity 90s.
The plugging formula comprises the following components in parts by weight: 45 parts of oil-based drill cuttings, 25 parts of asphalt powder with a softening point of 80 ℃,5 parts of silicate fibers and 25 parts of shell powder;
the particle size of the oil-based drilling cuttings particles is less than 3mm, and the 1mm screen residue is not more than 50%; standard sample separating sieve for shell powder 40-120 mesh; the particle size of the asphalt powder particles is 0.5 mm-1 mm; silicate fiber length is 1-3 mm.
The application method comprises the following steps:
(1) and (3) preparing plugging slurry: concentration is 30%, slurry quantity is 25m 3 . According to the requirements, sequentially adding oil-based drilling cuttings, irregular high-friction materials, flexible fibers and lipophilic deformation materials in preset quantities, and stirring for 30min to obtain segment plugging slurry;
(2) pulling a simplified drilling tool assembly (optical drill rod), and pulling a drill 3100m; pumping plugging slurry with the discharge capacity of 10L/s, after the plugging slurry is completely discharged from the drilling tool, lifting the drilling tool to 200m above the surface of the plugging slurry, adopting 10L/s to continuously squeeze the plugging slurry, wherein the squeezing amount is 3m & lt 3 & gt, the casing pressure is increased to 5.4MPa, stopping the pump for 30min, the casing pressure is stabilized at 5.1MPa, stopping the pump, starting the well, lifting the drilling tool, and stopping the drilling tool until the casing is in a static state for plugging for 24h;
(3) and drilling to the bottom, starting a pump at the discharge capacity of 10L/s, gradually increasing the normal drilling discharge capacity, and after cleaning the plugging material of the shaft, circulating for 1 week, stabilizing the liquid level, plugging successfully, and recovering drilling.
According to the embodiment, the plugging agent for recycling the oil-based drilling cuttings, which is introduced by the invention, solves the problem of oil-based drilling fluid leakage, and meanwhile, the plugging agent has the advantages of simple plugging formula, safe and efficient plugging application method, wide material source and capability of relieving the environmental protection pressure of oil-based drilling cuttings treatment.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications to these embodiments can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications should also be considered as the scope of the present invention.
Claims (8)
1. The plugging composition utilizing the oil-based drilling cuttings is characterized by comprising the following components in parts by weight:
40-50 parts of oil-based drilling cuttings;
15-25 parts of lipophilic deformation material;
5-10 parts of flexible fiber;
25-35 parts of irregular high friction material;
the oil-based drilling cuttings are crushed particles, the particle size is smaller than 3mm, and the 1mm screen residue is not more than 50%.
2. A lost circulation composition according to claim 1 wherein the oleophilic deformable material is an asphalt powder having a particle size of 0.5 to 1mm and a softening point of 60 ℃ to 80 ℃.
3. A lost circulation composition according to claim 1, wherein the flexible fibres are silicate fibres or polymer fibres, having a length of 1 to 3mm.
4. A lost circulation composition according to claim 1 wherein the irregular high friction material is oyster shell powder or shell powder, standard sample sizing screen 40-120 mesh.
5. A method of using the lost circulation composition of any one of claims 1-4, comprising the steps of:
preparing a plugging slurry using the plugging composition of any one of claims 1-4;
mainly aims at the leakage speed of not more than 20m 3 And (3) carrying out crack leakage at/h, drilling to 50-100 m above a leakage layer, and pumping the leakage blocking slurry to block leakage.
6. The method of claim 5, wherein the leak rate is not more than 10m 3 And/h of crack leakage, wherein the concentration of the plugging slurry is 15-20%.
7. The method of claim 6, further comprising, prior to pumping the plugging slurry: and (3) drilling down to 25-50 m below the leakage layer, and cleaning the leakage layer by adopting 15L/s circulation of discharge capacity.
8. The method of claim 5, wherein the leak rate is 10-20 m 3 And/h of crack leakage, wherein the concentration of the plugging slurry is 30-35%.
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