CN107558980B - Low-density temporary plugging crack length-extension-restraining fracturing method - Google Patents
Low-density temporary plugging crack length-extension-restraining fracturing method Download PDFInfo
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Abstract
A low-density temporary plugging crack length extension-inhibiting fracturing method is a method for quickly accumulating at the deep part of an artificial crack to form a temporary bridge plug to control the extension of the crack length of the artificial crack of an oil-gas field reservoir and realize the opening of the artificial crack to a lateral natural crack. The process method expands the oil drainage range of the oil well by forming a complex fracture network system in which a main fracture is communicated with a plurality of natural micro-fractures in the fracturing construction, achieves the purposes of utilizing lateral residual oil, improving the water drive effect of the oil well and increasing the yield of a single well. The process has strong operability, low cost and obvious oil field development benefit, realizes the opening and extension of the main fracture lateral natural fracture, supports the expanded natural fracture through the propping agent, forms a complex fracture system with the main fracture and a plurality of natural fractures communicated with each other, expands the lateral oil drainage area of an oil well, reduces the displacement radius of a water well, and establishes a branch fracture system and a water well driving system.
Description
Technical Field
The invention relates to the technical field of underground operation of oil field exploration and development, in particular to a low-density temporary plugging inhibition seam length extension fracturing method which is used for lateral residual oil for ultra-low permeability and ultra-low permeability oil reservoirs and improves the yield of a single well.
Background
With the advance of development process, the ultra-low permeability and ultra-low permeability reservoirs of the Changqing oil field are developed in the middle and later stages of development and are influenced by factors such as poor physical properties of reservoirs, natural fracture development and the like, the oil field development is faced with higher main direction extraction degree of fractures, and plane residual oil is mainly enriched in fracturesThe problem that a lateral oil well displacement system and a lateral oil well displacement system of a crack are difficult to establish enables crude oil in an oil drainage range controlled by an original artificial crack not to be effectively supplemented, and the yield increasing effect is not obvious due to the limitation of technology and cost in the existing repeated fracturing technology. The main points are as follows: firstly, the method is challenged by the limitation of the existing well pattern conditions and low oil price, the volume fracturing technology is easy to cause mutual communication of adjacent oil wells, the seam length is increased, the space is limited, the input-output ratio is low, and the investment recovery period is long; secondly, the conventional repeated fracturing technology can only realize the re-filling of old cracks, improve the flow conductivity in the cracks, and fail to realize the purposes of enlarging the oil drainage area and changing the original displacement system, and has poor effect after measures and short effective period of the measures; thirdly, the temporary plugging fracturing technology is implemented at the early stage, and the rigid temporary plugging agent has higher density (true density)>2.0g/cm3) The temporary chemical plugging agent is easy to bond and hold a group when heated when meeting water, the fracturing fluid has poor sand carrying performance, the conveying distance of the temporary plugging agent in a crack is short, and temporary plugging of the deep part of the crack cannot be realized. Therefore, how to realize the low-cost strategy of lateral residual oil for old wells, inhibit the extension of the length of the crack, promote the establishment of an effective lateral oil displacement system and improve the yield of a single well has important significance.
Disclosure of Invention
The invention aims to provide a low-density temporary plugging fracture length extension-inhibiting fracturing method, which is a method for quickly accumulating at the deep part of an artificial fracture to form temporary bridging to control the extension of the artificial fracture length of an oil-gas field reservoir and realize the opening of an artificial fracture lateral natural fracture. The process method expands the oil drainage range of the oil well by forming a complex fracture network system with a main fracture communicated with a plurality of natural micro-fractures in the fracturing construction, achieves the purposes of utilizing lateral residual oil, improving the water drive effect of the oil well, increasing the yield of a single well, and solves the problem of utilizing the lateral residual oil in the middle and later stages of the development of the ultra-low permeability oil reservoir and the ultra-low permeability oil reservoir.
In order to achieve the purpose, the invention adopts the technical scheme that:
a low-density temporary plugging crack length extension-restrained fracturing method comprises the following steps:
1) using active water to replace liquid in a shaft, and setting a packer;
2) injecting slick water, and opening the early-stage artificial crack;
3) adding the first-stage low-density temporary plugging agent mixture into a fiber fracturing fluid to form a mixed working fluid, then injecting the mixed working fluid into the deep part of the artificial crack, quickly accumulating to form a bridge plug, and continuing to perform the step 5 if the net pressure in the crack is increased to be more than 3MPa to achieve the condition of opening the natural crack; if the net pressure in the lifting seam is less than 3MPa, performing the step 4); the fiber fracturing fluid is prepared by the following steps: adding degradable polylactic resin fibers into guar gum base liquid to obtain the polylactic resin fiber;
4) adding the second-stage low-density temporary plugging agent mixture into the fiber fracturing fluid to form mixed working fluid, injecting the mixed working fluid into the deep part of the artificial crack again, quickly accumulating the mixed working fluid to form bridge plugging, increasing the net pressure in the crack to be more than 3MPa, and opening the natural crack; if the net pressure in the lifting seam can not be increased to be more than 3MPa, repeating the step 4) until the net pressure in the lifting seam is more than 3 MPa;
5) injecting slick water into the opened natural crack to serve as pad fluid, and expanding the extension of the natural crack length;
6) injecting mixed liquor consisting of slick water and propping agent into the formed new branch crack, wherein the sand adding specific concentration of the mixed liquor is increased in a 3-5 step mode, the sand specific concentration is less than or equal to 11%, and the enlarged natural crack is filled;
7) and performing main fracturing construction.
The further improvement of the invention is that the construction discharge amount of the active water in the step 1) is 0.4-0.5m3Min; at 0.5-1.0m3The construction displacement of/min sets the packer.
The invention is further improved in that the thickness of the mixture in the step 2) is 1.0-2.0m3The construction displacement of/min is used for injecting slickwater, and the injection amount of the slickwater is 10-20m3。
The invention has the further improvement that the mass concentration of the degradable polylactic acid resin fiber in the fiber fracturing fluid in the step 3) is 0.6-0.8%.
The invention is further improved in that the mass concentration of the guar gum base fluid in the step 3) is 0.3-0.4%.
The invention has the further improvement that the mass concentration of the first-stage low-density temporary plugging agent mixture in the mixed working solution in the step 3) is 0.2-0.8%; the first-stage low-density temporary plugging agent mixture is prepared by the following processes: the low-density temporary plugging agent with the grain diameter of 1.5-2mm, 2-3mm and 3-6mm is prepared by mixing the following components in percentage by mass: 3: 2 mixing to obtain a first-stage low-density temporary plugging agent mixture, wherein the density of the low-density temporary plugging agent mixture is 1.1-1.3g/cm3。
The invention has the further improvement that the mass concentration of the second-stage low-density temporary plugging agent mixture in the mixed working solution in the step 4) is 0.2-0.8%; the second-stage low-density temporary plugging agent mixture is prepared by the following processes: the low-density temporary plugging agent with the grain diameter of 1.5-2mm, 2-3mm and 3-6mm is prepared by mixing the following components in percentage by mass: 3: 3, obtaining a second-stage low-density temporary plugging agent mixture, wherein the density of the low-density temporary plugging agent is 1.1-1.3g/cm3。
The invention is further improved in that the amount of the slickwater injected in the step 5) is 20-30m3。
The invention is further improved in that the thickness of the mixture in the step 6) is 1.0-6.0m3Permin of the volume is added into the mixed solution.
A further improvement of the invention is that in step 6) the particle size of the proppant is 40-100 mesh.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a fracturing process method for inhibiting joint length extension based on a low-density temporary plugging agent, which is a process method combining degradable fibers, the low-density temporary plugging agent and repeated fracturing, provides a method for temporarily plugging and increasing net pressure in a joint by using a fiber fracturing fluid and the low-density temporary plugging agent, and mainly solves the problem that the conventional rigid temporary plugging agent has higher density (true density)>2.0g/cm3) The problem that subside soon, transport distance is short is carried the deep of artifical fissured in earlier stage through the network structure who forms fibre and the temporary stifled agent interact of low density, piles up the interim bridging that forms low filtration fast, produces certain net pressure difference in the crack seam, realizes opening and extending of main crack side direction natural fracture to natural crack through small-particle size proppant is propped up to the natural crack of expansionAnd supporting to form a complex fracture system with a main fracture and a plurality of natural fractures communicated with each other, so that the lateral oil drainage area of the oil well is enlarged, the displacement radius of the water well is reduced, and a branch fracture system and a water well driving system are established. In a field test of 5 wells, the pressure monitoring and temporary plugging are carried out on the bottom hole pressure by 3.5-8.3MPa, the net pressure in the crack reaches more than 5MPa, and the mechanical condition of opening the lateral natural crack is achieved; the length of the crack is controlled and the crack bandwidth is greatly improved by underground micro-seismic monitoring; after the measures, the average daily oil increase of a single well is 1.7t, which is 1.9 times of the conventional fracturing of adjacent wells in the same area, and a better effect is achieved. Meanwhile, the process has strong operability and lower cost, and can greatly improve the production benefit of the oil field.
Drawings
FIG. 1 is a schematic plan view of a low density temporary plug for inhibiting the extension of old fracture seams.
FIG. 2 is a top view of a low density temporary plug of a test well downhole micro-seismic for inhibiting the long extension of old fracture joints.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the invention optimizes the temporary plugging agent (density 1.1 g/cm) according to the reservoir property, the liquid type, the construction discharge capacity, the rock mechanical property and the like3-1.3g/cm3) The particle size specification (1.5mm-6mm) and the adding time (10-20 m is injected after the artificial crack is opened in the early stage3) And pumping parameters. The mixed working solution prepared by ground sand mixing equipment through rapid pumping injection consists of degradable polylactic resin fibers, linear glue and a low-density temporary plugging agent, wherein the low-density temporary plugging agent is prepared by the following method: according to the weight percentage, 60 to 85 percent of polylactic acid, 5 to 20 percent of starch, 5 to 10 percent of polycaprolactone, 2 to 5 percent of solubilizer and 2 to 5 percent of toughening agent are weighed and blended, and then are extruded and molded to prepare low-density temporary plugging agent particles with the particle size of 1.5 to 6mm, wherein the toughening agent is styrene butadiene rubber, the solubilizer is glycerol, the particle size of the temporary plugging agent particles is 1.5 to 2mm, 2 to 3mm and 3 to 6mm, and the true density of each particle size of the temporary plugging agent particles is 1.1g/cm3-1.3g/cm3(ii) a When the temporary plugging agent is used, three temporary plugging agents with different particle sizes are usedMixing and using; the degradable polylactic resin fiber is developed according to reservoir characteristics of the Changqing oil field and is prepared by the following method: the degradable polylactic resin material which is suitable for the stratum temperature of 60-90 ℃ is woven into a sample to be tested and then is cut into short cut filaments with the length of 10 mm. The characteristic of low density of the temporary plugging agent with low density is utilized to increase the conveying distance of the temporary plugging agent in the crack, and simultaneously, the net-shaped structure formed by the fiber fracturing fluid further reduces the sinking speed of the temporary plugging agent, and the dual functions of the fiber fracturing fluid and the temporary plugging agent with low density promote the temporary plugging agent (shown as I in figure 1) wrapped by the fiber fracturing fluid to be transferred to the end part of the crack, and temporary blocking is formed at the end part of the crack, the net pressure in the crack is improved, the condition that the vertical natural crack (shown as II in figure 1) of the crack is opened is achieved, a complex crack network is formed, the crack length extension is controlled (the length of the upper right picture of figure 1 is basically equivalent to that of the lower right picture of figure 1), the opening of the vertical natural crack is increased, and the drainage area is enlarged (the area included by the oil drainage boundary before and after temporary blocking in the upper right picture of figure 1 and the area included by the micro-seismic event boundary before and after temporary blocking in figure 2). The concrete fracturing process comprises the following steps:
firstly, optimizing the particle size specification of a low-density temporary plugging agent, the mechanical condition for opening a natural fracture and the lower limit value of temporary plugging and boosting according to the characteristics of an ultra-low permeability reservoir, the liquid type, the construction displacement, the rock mechanical property and the like of the Changqing oilfield, and carrying the temporary plugging agent with corresponding specification to the deep part of an early artificial fracture by adopting a working solution consisting of degradable polylactic resin fibers and linear glue to realize temporary plugging and boosting. The fracturing method comprises the following steps:
1) adding guar gum into water to prepare guar gum base liquid with the mass concentration of 0.3% -0.4%;
2) preparing degradable polylactic acid resin fiber fracturing fluid with mass concentration of 0.6-0.8% by taking the guanidine gum base fluid prepared in the step 1) as mother solution to be used as carrying fluid;
3) using active water at 0.4-0.5m3The construction displacement of/min is carried out to replace the liquid in the shaft;
4) at 0.5-1.0m3Min construction displacement setting packer to ensure subsequent constructionThe amount of the working fluid and the sand enter the stratum;
5) at 1.0-2.0m3Construction displacement per minute is injected into slickwater 10-20m3Starting the early-stage artificial cracks;
6) the low-density temporary plugging agent with the grain diameter of 1.5-2mm, 2-3mm and 3-6mm is prepared by mixing the following components in percentage by mass: 3: 2, mixing to obtain a first-stage low-density temporary plugging agent mixture, adding 150-200Kg of the first-stage low-density temporary plugging agent mixture into the degradable polylactic acid resin fiber fracturing fluid prepared in the step 2), wherein the mass concentration of the first-stage low-density temporary plugging agent mixture is 0.2-0.8%, then injecting the mixture into the deep part of an artificial crack, quickly stacking to form a bridge plug, and increasing the net pressure in the crack to be more than 3MPa to achieve the condition of opening the natural crack, and continuing to perform the step 8); if the temporary plugging boosting pressure does not reach 3MPa, performing step 7);
7) the low-density temporary plugging agent with the grain diameter of 1.5-2mm, 2-3mm and 3-6mm is prepared by mixing the following components in percentage by mass: 3: 3, mixing to obtain a second-stage low-density temporary plugging agent mixture, adding 50-100Kg of the second-stage low-density temporary plugging agent mixture into the fiber fracturing fluid prepared in the step 2), wherein the mass concentration of the second-stage low-density temporary plugging agent mixture is 0.2-0.8%, injecting the mixture into the deep part of the artificial crack again, quickly stacking to form a bridge plug, and opening the natural crack under the condition that the net pressure in the crack is increased by more than 3 MPa; if the net pressure in the lifting gap can not be increased to be more than 3MPa, repeating the step 7) until the net pressure in the lifting gap is more than 3 MPa.
8) Injecting slick water into the opened natural crack for 20-30m3As a pad fluid, the extension of the natural crack length is enlarged;
9) at 1.0-6.0m3Injecting mixed liquor consisting of slick water and proppant of 40-100 meshes into a new branch joint formed by the displacement per minute, wherein the sand adding ratio concentration (volume concentration) of the mixed liquor is increased in a 3-5-stage step mode, namely 3 sand adding ratio concentrations are adopted and are gradually increased, and the maximum sand ratio concentration is less than or equal to 11%. The sand ratio which can be carried under different discharge capacities is different, the high discharge capacity can carry high sand ratio concentration, and the low discharge capacity can only carry low sand ratio; the sand ratio concentration and the addition of the mixed solution are determined according to the density of the reservoir microfractures, and the reservoir stratum cannot be determined according to different reservoir stratumsAn amount; the specific substance of the propping agent is determined according to the closed stress of a reservoir, and the propping agent adopted by the current Changqing oil field is quartz sand adaptive to low closed stress or ceramsite adaptive to high closed stress and is filled with enlarged natural cracks; among these, slickwater is a low viscosity liquid that serves the purpose of transporting proppant and rapidly leaching in fractures.
10) And performing main fracturing construction.
The temporary plugging agent with low density is a high-strength, rigid and degradable temporary plugging agent which is mainly made of polymer composite materials and is processed according to the requirements of sandstone reservoirs in Changqing oil fields.
The low-density temporary plugging agent is prepared by selecting and processing a reasonable particle size specification according to the width of a dynamic crack seam and a bridging theory, the particle size range of the processable temporary plugging agent is 1.5-6.0 mm, and the mixing proportion can be adjusted according to the temporary plugging boosting effect.
The low-density temporary plugging agent can be completely degraded within one week under the condition of clear water at the experimental temperature of 60 ℃.
The lower limit of the net pressure value in the crack is increased, and is determined by the difference value of the natural crack opening net pressure value and the net pressure value generated by the discharge capacity in construction.
The following description will be made by way of specific examples.
Example 1
1) Preparing 0.3 mass percent guar gum base liquid;
2) preparing 0.8% degradable polylactic resin fiber fracturing fluid as carrier fluid by taking the guanidine gum base fluid prepared in the step 1) as mother solution;
3) using active water at 0.4-0.5m3The construction displacement of/min is carried out to replace the liquid in the shaft;
4) at 0.5-1.0m3Setting a packer by construction displacement of/min to ensure that subsequent construction liquid and sand enter a stratum;
5) at 2.0m3Construction displacement per minute is injected into slickwater 10-20m3Starting the early-stage artificial cracks;
6) 150Kg of low-density temporary plugging agent with the particle size of 2mm to 3mm to 4mm is mixed according to the mass ratio of 3: 3: 2, mixing, adding the mixture into the fiber fracturing fluid prepared in the step 2) at a mass concentration of 0.4%, injecting the mixture into the deep part of the artificial crack, quickly accumulating to form a bridge plug, increasing the net pressure in the crack to be more than 3MPa, and opening the natural crack;
7) injecting slick water 20m into the opened natural crack3As a pad fluid, the extension of the natural crack length is enlarged;
8) at 3.0m3The displacement per minute is to form a new branch seam step-type liquid, the new branch seam is added into a mixed liquid consisting of slick water and 40-100 meshes of propping agent, the sand adding specific concentration (volume concentration) of the mixed liquid is 7% -9% -11% in sequence, and the expanded natural fracture is filled;
9) and performing main fracturing construction.
In the process, firstly, determining two-phase stress difference values of different reservoir levels and the pressure difference of opening of the natural fracture under the stress difference value, wherein the pressure value is a critical value of a plurality of micro-fractures communicated with a main fracture and is also a standard of a net pressure value in the fracture to which the temporary plugging process requirement must meet; and then calculating the net pressure value in the construction stage according to the selected construction discharge capacity and the concentration of the type of the working fluid, and forming a plurality of micro cracks communicated with the main crack by using the difference between the horizontal two-phase stress difference value and the net pressure value generated under the designated construction discharge capacity of the selected working fluid through low-density temporary plugging boosting.
The fracturing technology for inhibiting the crack length by temporary plugging at low density is used for a field test of a G-well, the horizontal two-phase stress difference of the well is 6.5MPa, the net pressure required for opening a natural crack is 4-6MPa, working liquid consisting of degradable polylactic acid resin fibers, 0.3% of linear glue and 4mm low-density temporary plugging agent is adopted in construction for temporarily plugging the artificial crack at the early stage, the ground construction pressure is increased to 25.2MPa from 18.4MPa, the pressure is increased to 6.8MPa, the bottom hole pressure is increased to 33.5MPa from 26.5MPa, and the pressure is increased to 7MPa, so that the condition for opening the natural crack is achieved, and a complex crack network is formed; the length of the crack is controlled and the crack bandwidth is greatly improved by underground micro-seismic monitoring; after the well measures are taken, the daily oil yield is 2.6t, the daily oil increase is 1.8t, the daily oil increase is 1.0t higher than that of the conventional fracturing well of the adjacent well in the same region, and the yield increase effect is obvious.
Example 2
1) The using construction displacement is 0.4m3The active water/min is used for low displacement of the liquid in the well bore, and then the displacement is carried out at 0.5m3A construction displacement per minute setting packer;
2) at 2.0m3Construction displacement per minute is poured into slickwater 10m3Starting the early-stage artificial cracks;
3) the low-density temporary plugging agent with the grain diameter of 1.5mm, 3mm and 6mm is prepared by mixing the following components in percentage by mass: 3: 2, mixing to obtain a first-stage low-density temporary plugging agent mixture, adding the first-stage low-density temporary plugging agent mixture into the fiber fracturing fluid to form a mixed working fluid, wherein the mass concentration of the first-stage low-density temporary plugging agent mixture in the mixed working fluid is 0.2%; then injecting the mixed working solution into the deep part of the artificial crack, quickly accumulating to form a bridge plug, and continuing to perform the step 5) if the net pressure in the lifting crack reaches more than 3MPa to achieve the condition of opening the natural crack; if the net pressure in the lifting seam is less than 3MPa, performing the step 4); the fiber fracturing fluid is prepared by the following steps: adding degradable polylactic resin fibers into guar gum base liquid to prepare the fiber fracturing fluid, wherein the mass concentration of the degradable polylactic resin fibers in the fiber fracturing fluid is 0.6%; the guar gum base solution is prepared by adding guar gum into water, and the mass concentration of the guar gum base solution is 0.3%.
4) Adding the mixture of the second-stage low-density temporary plugging agent into the fiber fracturing fluid prepared in the step 2), wherein the low-density temporary plugging agent with the particle size of 1.5mm, 3mm or 6mm is prepared by mixing the following components in a mass ratio of 2: 3: 3, obtaining a second-stage low-density temporary plugging agent mixture after mixing. The mass concentration of the low-density temporary plugging agent mixture is 0.2%, then the mixture is injected into the deep part of the artificial crack, the mixture is quickly accumulated to form a bridge plug, the net pressure in the crack is increased by more than 3MPa, and the natural crack is opened; if the net pressure in the lifting gap can not be increased to be more than 3MPa, repeating the step 4) until the net pressure in the lifting gap is more than 3 MPa.
5) Injecting 20m into the opened natural fracture3The slick water is used as a pad fluid to expand the extension of the natural crack length;
6) at 1.0m3Displacement of/minInjecting mixed liquor consisting of slick water and propping agent with the grain diameter of 40-100 meshes into the new branch crack, wherein the sand adding ratio concentration of the mixed liquor is increased in a 3-5 step-by-step mode (the sand adding ratio concentration is 3% -5% -7%), and the expanded natural crack is filled;
7) and performing main fracturing construction.
Example 3
1) The using construction displacement is 0.5m3The active water of/min is used for low displacement of the liquid in the well bore, and then 1m3A construction displacement per minute setting packer;
2) at 1.0m3Construction displacement per minute (20 m) of slickwater3Starting the early-stage artificial cracks;
3) the low-density temporary plugging agent with the particle size of 2mm, 2mm and 3mm is prepared by mixing the following components in a mass ratio of 3: 3: 2, mixing to obtain a first-stage low-density temporary plugging agent mixture, adding the first-stage low-density temporary plugging agent mixture into the fiber fracturing fluid to form a mixed working fluid, wherein the mass concentration of the first-stage low-density temporary plugging agent mixture in the mixed working fluid is 0.5%; then injecting the mixed working solution into the deep part of the artificial crack, quickly accumulating to form a bridge plug, and continuing to perform the step 5) if the net pressure in the lifting crack reaches more than 3MPa to achieve the condition of opening the natural crack; if the net pressure in the lifting seam is less than 3MPa, performing the step 4); the fiber fracturing fluid is prepared by the following steps: adding degradable polylactic resin fibers into guar gum base liquid to prepare the fiber fracturing fluid, wherein the mass concentration of the degradable polylactic resin fibers in the fiber fracturing fluid is 0.7%; the guar gum base solution is prepared by adding guar gum into water, and the mass concentration of the guar gum base solution is 0.3%.
4) Adding the mixture of the second-stage low-density temporary plugging agent into the fiber fracturing fluid prepared in the step 2), wherein the low-density temporary plugging agent with the particle size of 2mm, 2mm and 3mm is prepared by mixing the following components in a mass ratio of 2: 3: 3, obtaining a second-stage low-density temporary plugging agent mixture after mixing. The mass concentration of the low-density temporary plugging agent mixture is 0.5%, then the mixture is injected into the deep part of the artificial crack, the mixture is quickly accumulated to form a bridge plug, the net pressure in the crack is increased by more than 3MPa, and the natural crack is opened; if the net pressure in the lifting gap can not be increased to be more than 3MPa, repeating the step 4) until the net pressure in the lifting gap is more than 3 MPa.
5) Injecting 25m into the opened natural crack3The slick water is used as a pad fluid to expand the extension of the natural crack length;
6) at 3.0m3Injecting mixed liquor consisting of slick water and propping agent with the grain diameter of 40-100 meshes into a new branch seam formed by the displacement per minute, wherein the sand adding ratio concentration of the mixed liquor is increased in a 3-5 step mode (the sand adding ratio concentration is 5% -7% -9%), and filling the enlarged natural fracture;
7) and performing main fracturing construction.
Example 4
1) The using construction displacement is 0.4m3The active water/min is used for low displacement of the liquid in the well bore, and then the displacement is carried out at 0.7m3A construction displacement per minute setting packer;
2) at 1.5m3Construction displacement per minute is injected into slickwater 15m3Starting the early-stage artificial cracks;
3) the low-density temporary plugging agent with the particle size of 2mm, 2mm and 5mm is prepared by mixing the following components in a mass ratio of 3: 3: 2, mixing to obtain a first-stage low-density temporary plugging agent mixture, adding the first-stage low-density temporary plugging agent mixture into the fiber fracturing fluid to form a mixed working fluid, wherein the mass concentration of the first-stage low-density temporary plugging agent mixture in the mixed working fluid is 0.8%; then injecting the mixed working solution into the deep part of the artificial crack, quickly accumulating to form a bridge plug, and continuing to perform the step 5) if the net pressure in the lifting crack reaches more than 3MPa to achieve the condition of opening the natural crack; if the net pressure in the lifting seam is less than 3MPa, performing the step 4); the fiber fracturing fluid is prepared by the following steps: adding degradable polylactic resin fibers into guar gum base liquid to prepare the fiber fracturing fluid, wherein the mass concentration of the degradable polylactic resin fibers in the fiber fracturing fluid is 0.8%; the guar gum base solution is prepared by adding guar gum into water, and the mass concentration of the guar gum base solution is 0.4%.
4) Adding the mixture of the second-stage low-density temporary plugging agent into the fiber fracturing fluid prepared in the step 2), wherein the low-density temporary plugging agent with the particle size of 2mm, 2mm and 5mm is prepared by mixing the following components in a mass ratio of 2: 3: 3, obtaining a second-stage low-density temporary plugging agent mixture after mixing. The mass concentration of the low-density temporary plugging agent mixture is 0.8%, then the mixture is injected into the deep part of the artificial crack, the mixture is quickly accumulated to form a bridge plug, the net pressure in the crack is increased by more than 3MPa, and the natural crack is opened; if the net pressure in the lifting gap can not be increased to be more than 3MPa, repeating the step 4) until the net pressure in the lifting gap is more than 3 MPa.
5) Injecting 30m into the opened natural fracture3The slick water is used as a pad fluid to expand the extension of the natural crack length;
6) at 6.0m3Injecting mixed liquor consisting of slick water and propping agent with the grain diameter of 40-100 meshes into a new branch seam formed by the discharge volume per minute, wherein the sand adding ratio concentration of the mixed liquor is increased in a 3-5 step mode (specifically 7% -9% -11%), and enlarged natural cracks are filled;
7) and performing main fracturing construction.
In a field test of 5 wells, the pressure monitoring and temporary plugging are carried out on the bottom hole pressure by 3.5-8.3MPa, the net pressure in the crack reaches more than 5MPa, and the mechanical condition of opening the lateral natural crack is achieved; the length of the crack is controlled and the crack bandwidth is greatly improved by underground micro-seismic monitoring; after the measures, the average daily oil increase of a single well is 1.7t, which is 1.9 times of the conventional fracturing of adjacent wells in the same area, and a better effect is achieved. Meanwhile, the process has strong operability and lower cost, and can greatly improve the production benefit of the oil field.
The invention quickly accumulates to form a temporary bridge plug with low filtration loss at the deep part of the artificial crack in the previous period, generates a certain net pressure difference in the crack, opens and extends a lateral natural crack to form a complex crack system, enlarges the lateral oil drainage area of an oil well and establishes an effective displacement system. The process has strong operability, low cost and obvious oil field development benefit, and solves the problem that the conventional rigid temporary plugging agent has high density (true density)>2.0g/cm3) And the chemical temporary plugging agent is easy to bond and agglomerate when meeting water or heating, has quick sedimentation and short conveying distance, and also solves the problem of the lateral residual oil for the ultra-low permeability and ultra-low permeability oil reservoirs.
Claims (7)
1. A low-density temporary plugging crack length extension fracturing method is characterized by comprising the following steps:
1) using active water to replace liquid in a shaft, and setting a packer; wherein the construction discharge capacity of the active water is 0.4-0.5m3Min; at 0.5-1.0m3A construction displacement per minute setting packer;
2) injecting slick water, and opening the early-stage artificial crack; wherein the thickness is 1.0-2.0m3The construction displacement of/min is used for injecting slickwater, and the injection amount of the slickwater is 10-20m3；
3) Adding the first-stage low-density temporary plugging agent mixture into a fiber fracturing fluid to form a mixed working fluid, then injecting the mixed working fluid into the deep part of the artificial crack, quickly accumulating to form a bridge plug, and continuing to perform the step 5 if the net pressure in the crack is increased to be more than 3MPa to achieve the condition of opening the natural crack; if the net pressure in the lifting seam is less than 3MPa, performing the step 4); the fiber fracturing fluid is prepared by the following steps: adding degradable polylactic resin fibers into guar gum base liquid to obtain the polylactic resin fiber; the first-stage low-density temporary plugging agent mixture is prepared by the following processes: the low-density temporary plugging agent with the grain diameter of 1.5-2mm, 2-3mm and 3-6mm is prepared by mixing the following components in percentage by mass: 3: 2 mixing to obtain a first-stage low-density temporary plugging agent mixture, wherein the low-density temporary plugging agent is a rigid temporary plugging agent, and the density of the low-density temporary plugging agent is 1.1-1.3g/cm3；
4) Adding the second-stage low-density temporary plugging agent mixture into the fiber fracturing fluid to form mixed working fluid, injecting the mixed working fluid into the deep part of the artificial crack again, quickly accumulating the mixed working fluid to form a bridge plug, increasing the net pressure in the crack by more than 3MPa, and opening the natural crack; if the net pressure in the lifting seam can not be increased to be more than 3MPa, repeating the step 4) until the net pressure in the lifting seam is more than 3 MPa; the second-stage low-density temporary plugging agent mixture is prepared by the following processes: the low-density temporary plugging agent with the grain diameter of 1.5-2mm, 2-3mm and 3-6mm is prepared by mixing the following components in percentage by mass: 3: 3, obtaining a second-stage low-density temporary plugging agent mixture after mixing, wherein the low-density temporary plugging agent is a rigid temporary plugging agent and has the density of 1.1-1.3g/cm3；
5) Injecting slick water into the opened natural crack to serve as pad fluid, and expanding the extension of the natural crack length; wherein slick water is injectedThe amount is 20-30m3；
6) Injecting mixed liquor consisting of slick water and propping agent into the formed new branch crack, wherein the sand adding specific concentration of the mixed liquor is increased in a 3-5 step mode, the sand specific concentration is less than or equal to 11%, and the enlarged natural crack is filled;
7) and performing main fracturing construction.
2. The method for temporarily blocking and inhibiting the fracture length extension fracturing according to claim 1, wherein the mass concentration of the degradable polylactic resin fibers in the fiber fracturing fluid in the step 3) is 0.6-0.8%.
3. The method for temporarily blocking and inhibiting the fracture length from extending and fracturing according to claim 1, wherein the mass concentration of the guar gum base fluid in the step 3) is 0.3-0.4%.
4. The method for inhibiting the fracture length extension fracturing by temporarily plugging the low density according to claim 1, wherein the mass concentration of the mixture of the first-stage temporary plugging agent in the mixed working fluid in the step 3) is 0.2-0.8%.
5. The method for inhibiting the fracture length extension fracturing by temporary plugging with low density as claimed in claim 1, wherein the mass concentration of the mixture of the second-stage temporary plugging agent in the mixed working fluid in the step 4) is 0.2-0.8%.
6. The method for inhibiting the crack length extension fracturing by temporarily plugging the low density according to claim 1, wherein the thickness of the crack length extension fracturing fluid in the step 6) is 1.0-6.0m3Permin of the volume is added into the mixed solution.
7. The method for low-density temporary plugging and inhibiting fracture length extension fracturing as claimed in claim 1, wherein the particle size of the proppant in the step 6) is 40-100 meshes.
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