CN110273671B - Micro-acid-pressure composite injection increasing method for high-pore high-permeability reservoir on sea - Google Patents
Micro-acid-pressure composite injection increasing method for high-pore high-permeability reservoir on sea Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
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- Cleaning By Liquid Or Steam (AREA)
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Abstract
The invention discloses a micro-acid-pressure composite injection increasing method for a high-porosity and high-permeability reservoir on the sea, which comprises the following steps: s1, screening out a target well suitable for micro-acid fracturing composite plugging removal and injection increase; s2, injecting a liquid medium into the target well to fracture the near-well stratum to form a micro-crack and keep the micro-crack open; s3, injecting an acid liquor system as a pad liquor or a postliquid to dissolve and remove inorganic scale in a near-well zone; s4, injecting acid treatment liquid to etch the opened crack wall surface; and S5, evaluating the augmented injection effect by adopting the water absorption index or the daily water injection amount. If there is an organic blockage in the target well, before performing step S3, the method further includes an operation of removing the organic blockage: and injecting an organic cleaning fluid into the target well to dissolve and remove organic scale at the bottom of the well and organic matter damage near the well. The method integrates the technologies of micro-fracturing cracks, organic solvent cleaning, acid etching crack transformation and the like, and realizes that the injection increase of the offshore oilfield water injection well meets the requirement of 'sufficient water injection' in the oilfield development water injection process.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a micro-acid-fracturing composite plugging removal and injection enhancement method suitable for a high-porosity and high-permeability reservoir on the sea.
Background
The reservoir stratum can be damaged due to various reasons in the offshore oilfield water injection process, and the damage can be relieved to a certain extent by adopting an acidification and blockage relieving measure so as to recover the water injection capability. At present, the conventional acidification technology (no microcracks are formed), the organic matter damage removing technology by organic solvent cleaning and the large-scale acid fracturing technology are widely applied to oil reservoirs of sea and land sandstone oil reservoirs. However, the acidification plugging removal effective period is reduced along with the increase of repeated acidification times, so that more frequent plugging removal operation is required to meet the requirement of 'sufficient water injection' in oil field development, and the acidification cost is high.
Disclosure of Invention
The invention aims to provide a method for micro-acid-pressure composite injection enhancement of a high-porosity and high-permeability reservoir in the sea aiming at the severe current situations of short effective period of repeated acidification, limited injection enhancement effect and high acidification cost of the conventional acidification technology. The method is suitable for high-pore high-permeability sandstone reservoir water injection wells in the sea, and the wells easily cause the problems of sand production and the like due to the collapse of reservoir matrixes if the conventional acid fracturing technology is adopted.
The invention is suitable for a micro-acid-pressure composite injection increasing method of a high-pore high-permeability reservoir on the sea, and comprises the following working procedures:
and S1, screening out the micro-acid fracturing composite plugging and injection increasing well based on the core experiment evaluation or theoretical analysis method evaluation in the drilling and completion process, the water injection process and the previous operation process. Specifically, based on the dynamic change of water injection of the water injection well, the method of analyzing components of water by assay, evaluating damage, testing theoretical analysis and the like is adopted to determine the main reasons of the reduction of the water injection capacity, namely the organic damage of the well bottom and the near well and other damages of the near well. Finally determining according to the decomposition of the epidermis coefficient and the water quality analysis.
S2, injecting a liquid medium into the target well to fracture the near-well stratum to form a micro-crack and keep the micro-crack open, thereby creating conditions for the subsequent injection of organic cleaning liquid. The specific operation is as follows: adding the injection water into the platform injection water in advance; determining the highest pressure limiting value of the injection pressure according to the well structure, the well mouth, equipment, formation fracture pressure and other limiting conditions; 1/4 or 0.1m according to maximum injection displacement3Taking/min as initial injection displacement, increasing displacement in steps until construction pressure reaches the maximum pressure limiting value, measuring the relation between pressure and displacement, making a pressure-displacement relation graph, and breaking the point corresponding to constant displacement and obvious pressure dropAnd (4) breaking points.
And S3, injecting an acid liquor system as a pad liquor or a post liquor to dissolve and remove inorganic scale in the near-well zone.
And S4, injecting an acid treatment liquid to etch the opened crack wall surface.
And S5, evaluating the augmented injection effect by adopting the water absorption index or the daily water injection amount. And testing the corresponding stable water injection amount according to the testing pressure point before the fracturing measure, and calculating the water absorption index according to the stable water injection amount. And comparing the water absorption indexes after the measures and before the measures to evaluate the injection increasing effect of the water injection well according to the injection increasing ratio.
In the above method, if there is an organic blockage in the target well, before performing step S3, the method further includes an operation of removing the organic blockage: and injecting an organic cleaning fluid into the target well to dissolve and remove organic scale at the bottom of the well and organic matter damage near the well. After organic matters are removed by the organic cleaning solution, the step S3 is facilitated, and the inorganic scales of the reservoir are fully contacted with an inorganic acid liquid system. The organic cleaning solution is prepared by mixing a water-soluble organic cleaning agent and water according to the volume ratio of 1: 5. The organic cleaning agent comprises the following components in percentage by mass: 73% of polyoxyethylene octyl phenol ether sodium propylidene sulfonate, 17% of polyoxyethylene polyoxypropylene butane alcohol ether phosphate, 5% of n-octanol and 5% of isopropanol. The calculation formula of the volume Q of the injected organic cleaning liquid is as follows:
Q＝π(R-r)2*h，
wherein R is the designed reservoir processing radius in m; r is the wellbore inner diameter in m; h is the effective vertical thickness of the reservoir in m.
Preferably, the liquid medium is one or a mixture of two of a platform water source, seawater and fresh water.
Preferably, the acid liquid system in step S3 is a weakly-corrosive liquid, which is composed of the following components in percentage by volume: 12% of hydrochloric acid, 5% of acetic acid, 5% of micelle agent, 1% of corrosion inhibitor, 1% of iron stabilizer, 1% of viscosity stabilizer, 1% of cleanup additive, 5% of mutual solvent and the balance of fresh water. The acid liquor system preparation method comprises the following steps: hydrochloric acid, acetic acid, corrosion inhibitor and other additives are added into the fresh water in sequence. The order of addition of the other additives is required. The acid liquor system has the functions of removing inorganic blockage, dissolving calcium, keeping low pH and isolating the contact of the crude oil and the acid liquor.
Preferably, the acidic treatment solution in step S4 is composed of the following components by volume percentage: 10% of hydrochloric acid, 8% of fluoboric acid, 2% of hydrofluoric acid, 1% of corrosion inhibitor, 1% of iron stabilizer, 2% of adhesion stabilizer, 1% of cleanup additive and the balance of fresh water. The preparation method of the acidic treatment solution comprises the following steps: hydrochloric acid, fluoroboric acid, hydrofluoric acid, corrosion inhibitor and other additives are sequentially added into the fresh water. The order of addition of the other additives is required. The acid treatment liquid penetrates into cracks to further etch the cracks, and a strong acid is used for achieving the purpose of quick reaction; meanwhile, the device has a good retarding effect, can relieve deep damage of the stratum and increase the treatment radius.
Compared with the prior art, the invention has the following beneficial effects:
the invention comprehensively applies the micro-fracturing crack technology, the organic solvent cleaning and the acid-etched crack modification technology into a whole. The method is characterized in that micro fracturing is carried out by using platform water source water (short-time fracturing technology that fracturing is stopped after micro fractures are formed in a reservoir near a shaft by injecting a liquid medium without adding a propping agent), organic solvent is adopted to clean near-well zones with machine plugging to remove partial plugging, acid liquor is injected to dissolve soluble matrixes in the fractures, and the diversion capability of near-well zones with fractures is increased to realize that the increase of the injection of a water injection well of the offshore oil field can meet the requirement of 'enough water injection' in the water injection process of the oil field development. On one hand, an artificial short crack with certain flow conductivity is formed by utilizing the opening and/or shearing sliding action of a near-well rock stratum, meanwhile, a near-well organic plug of an organic cleaning liquid slug is effectively dissolved, and the soluble part of a stratum matrix is dissolved by adopting acid liquor to improve the porosity and the permeability, so that the injection increasing purpose of recovering and improving the water injection capacity of the water injection well is realized.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a water injection dynamic curve before an example well is unplugged.
FIG. 2 is a graph of the effect of microcrack conductivity on injection ratio.
FIG. 3 is a graph showing the relationship between the variation of injection rate of a partially de-skinned injection well.
FIG. 4 is an image of the wall surface etched by acid dissolution.
FIG. 5 is a comparison of water absorption indexes before and after the measurement.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
The micro-acid-pressure composite injection increasing method is applied to the Bohai south oilfield BZ-X well, and comprises the following specific operation steps:
step one, screening water injection wells
And BZ-X is a directional water injection well of a 1D well region of a BZ oil field west block in the Bohai. The well completion depth is 2394.00m, the vertical depth is 1788.34m, the maximum well deviation is 49.76 degrees, the vertical depth in the middle of the perforation is 1615.6m, and the vertical thickness of the perforation is 28.5 m. And (4) putting the hollow integrated layered injection allocation tubular column, closing the water nozzle of the first sand control section, and opening the water nozzle of the second sand control section. Injecting at oil pressure of 1.3MPa for 9 months and 30 days in 2015, injecting water at a rate of 72m3. The field test analyzes that the surface coefficient of the well is about 12, and the bottom of the well is polluted. The main reasons are damage caused during the drilling and completion process (accumulated leakage completion fluid 260 during the completion process, which may damage the reservoir due to the invasion of the working fluid filtrate during the drilling and completion process), damage caused during the water injection process (blockage caused by the standard exceeding of the water injection part index, main cleaning of precipitates related to iron ions after mixed injection, and CaCO production3Scale formation with FeCO3And Fe2+Reservoir blockage caused by corresponding corrosion products), damage caused by past measures (the well is subjected to multiple times of high-pressure stimulation and injection increasing operation, high-pump pressure and large-displacement centralized water injection, one side isThe surface opens the micro-cracks of the near wellbore zone, the water absorption capacity of the stratum is obviously improved, on the other hand, the solid phase particles of the stratum can be peeled off under the condition of strong erosion to form particle migration blockage, and meanwhile, some blockage substances of the near wellbore zone can be pushed to the deep part of the stratum to cause the deep part of the stratum to be blocked). Wherein the damage caused by the water filling stage and the previous measures may be serious. The type of damage is dominated by particulate migration and scaling, which results in plugging near the wellbore area and around the screens. Therefore, in order to solve the problem of insufficient water injection, the micro-acid-pressure composite injection increasing method is adopted.
Step two, selecting the working fluid system
(1) And (4) preparing injection water and adding the injection water into the injection platform.
(2) And (4) evaluating and optimizing the formula composition of the organic cleaning solution according to the compatibility of the chemical agent and a core flow experiment. The organic cleaning solution is prepared by mixing a water-soluble organic cleaning agent and water according to the volume ratio of 1: 5. The organic cleaning agent comprises the following components in percentage by mass: 73% of polyoxyethylene octyl phenol ether sodium propylidene sulfonate, 17% of polyoxyethylene polyoxypropylene butane alcohol ether phosphate, 5% of n-octanol and 5% of isopropanol.
(3) And (4) evaluating and optimizing the formula composition of the front/rear weak corrosive acid liquid system according to the compatibility of the chemical agent and a core flow experiment. The acid liquor system comprises the following components in percentage by volume: 12% of hydrochloric acid, 5% of acetic acid, 5% of micelle agent, 1% of corrosion inhibitor, 1% of iron stabilizer, 1% of viscosity stabilizer, 1% of cleanup additive, 5% of mutual solvent and the balance of fresh water. Wherein, the micelle agent is isomeric tridecanol polyoxyethylene ether, the corrosion inhibitor is thiosulfate imidazoline, the iron stabilizer is citric acid, the viscosity stabilizer is dodecyl trimethyl ammonium chloride, the cleanup additive is sodium dodecyl benzene sulfonate, and the mutual solvent is ethylene glycol monobutyl ether.
(4) And (4) optimizing the formula composition of the acidic treating fluid according to the compatibility of the chemical agent and the evaluation of a core flow experiment. The acidic treatment liquid comprises the following components in percentage by volume: 10% of hydrochloric acid, 8% of fluoboric acid, 2% of hydrofluoric acid, 1% of corrosion inhibitor, 1% of iron stabilizer, 2% of adhesion stabilizer, 1% of cleanup additive and the balance of fresh water. Wherein, the micelle agent is isomeric tridecanol polyoxyethylene ether, the corrosion inhibitor is thiosulfate imidazoline, the iron stabilizer is citric acid, the viscosity stabilizer is dodecyl trimethyl ammonium chloride, the cleanup additive is sodium dodecyl benzene sulfonate, and the mutual solvent is ethylene glycol monobutyl ether.
The injection scale design is shown in tables 1 and 2.
TABLE 1 liquid compounding table
TABLE 2 organic purge slugs
| Name (R) | Cleaning liquid | Displacing liquid | Total of |
| Volume of liquid (m)3) | 6 | 10 | 16 |
| Organic cleaning agent (kg) | 5200 | 0 | 5200 |
| Mutual solvent (kg) | 300 | 0 | 300 |
| Geothermal water (m)3) | 0 | 10 | 10 |
The organic cleaning agent in the table 2 comprises the following components in percentage by mass: 73% of polyoxyethylene octyl phenol ether sodium propylidene sulfonate, 17% of polyoxyethylene polyoxypropylene butane alcohol ether phosphate, 5% of n-octanol and 5% of isopropanol. The mutual solvent is ethylene glycol monobutyl ether.
Step three, implementing the steps, wherein the specific operation details are shown in table 3, and the steps comprise steps 1-8. The dynamic curve of water injection during micro-fracturing acidizing plug removal construction is shown in figure 1. Fig. 1 corresponds to the point where the displacement is constant and the pressure drops significantly, i.e. the breaking point. The effect of B microcrack conductivity on the injection-stimulation ratio is shown in figure 2. The relationship between the change in injection ratio of the partially removed epidermis is shown in FIG. 3. The imaging picture of the wall surface of the acid-soluble etching crack is shown in figure 4. A comparison of water uptake indexes before and after BZ-X well intervention is shown in FIG. 5.
TABLE 3 concrete implementation procedure
In conclusion, the micro acid fracturing composite injection increasing method suitable for the high-pore high-permeability reservoir on the sea mainly aims at the difficulties that the acidizing effective period of a water injection well is short and the injection increasing effect is not obvious, adopts a micro acid fracturing composite injection increasing process, and improves the injection increasing ratio of the water injection well by improving the near-well seepage capability through multiple mechanisms.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (6)
1. A method for micro-acid-pressure composite injection augmentation of a high-pore hypertonic reservoir on the sea is characterized by comprising the following steps:
s1, screening out a target well suitable for micro-acid fracturing composite plugging removal and injection increase;
s2, injecting a liquid medium into the target well to fracture the near-well stratum to form a micro-crack and keep the micro-crack open, wherein the liquid medium is one or a mixed solution of a platform water source, seawater and fresh water;
s3, injecting an acid liquor system as a pad liquor or a postliquid to dissolve and remove inorganic scale in a near-well zone; the acid liquid is weak-corrosion liquid and consists of the following components in percentage by volume: 12% of hydrochloric acid, 5% of acetic acid, 5% of micelle agent, 1% of corrosion inhibitor, 1% of iron stabilizer, 1% of viscosity stabilizer, 1% of cleanup additive, 5% of mutual solvent and the balance of fresh water;
s4, injecting acid treatment liquid to etch the opened crack wall surface; the acidic treatment liquid comprises the following components in percentage by volume: 10% of hydrochloric acid, 8% of fluoboric acid, 2% of hydrofluoric acid, 1% of corrosion inhibitor, 1% of iron stabilizer, 2% of adhesion stabilizer, 1% of cleanup additive and the balance of fresh water;
the micelle agent used in the steps S3 and S4 is isomeric tridecanol polyoxyethylene ether, the corrosion inhibitor is thiosulfate imidazoline, the iron stabilizer is citric acid, the viscosity stabilizer is dodecyl trimethyl ammonium chloride, the cleanup additive is sodium dodecyl benzene sulfonate, and the mutual solvent is ethylene glycol monobutyl ether;
and S5, evaluating the augmented injection effect by adopting the water absorption index or the daily water injection amount.
2. The method for micro-acid fracturing composite stimulation of a high-pore hypertonic reservoir on the sea as claimed in claim 1, wherein if organic blockage exists in the target well, the method further comprises the operation of removing the organic blockage before the step S3: and injecting an organic cleaning fluid into the target well to dissolve and remove organic scale at the bottom of the well and organic matter damage near the well.
3. The method for micro-acid-fracturing composite stimulation of a high-pore hypertonic reservoir on the sea as claimed in claim 2, wherein the volume Q of the injected organic cleaning fluid is calculated according to the following formula:
Q＝π(R-r)2*h，
wherein R is the designed reservoir processing radius in m; r is the wellbore inner diameter in m; h is the effective vertical thickness of the reservoir in m.
4. The method for micro-acid-fracturing composite augmented injection of the high-pore hypertonic reservoir on the sea as claimed in claim 3, wherein the organic cleaning solution is prepared by mixing a water-soluble organic cleaning agent and water according to a volume ratio of 1:5, and the organic cleaning agent is composed of the following components in percentage by mass: 73% of polyoxyethylene octyl phenol ether sodium propylidene sulfonate, 17% of polyoxyethylene polyoxypropylene butane alcohol ether phosphate, 5% of n-octanol and 5% of isopropanol.
5. The method for micro-acid-fracturing composite injection enhancement of the high-pore hypertonic reservoir on the sea as claimed in claim 1, wherein in step S1, a suitable micro-acid-fracturing composite plugging and injection enhancement well is screened out based on the core experiment evaluation or theoretical analysis method evaluation of the drilling and completion process, the water injection process and the previous operation process.
6. The method for micro-acid-fracturing composite stimulation of a high-pore hypertonic reservoir on the sea as claimed in claim 1, wherein in step S2, the maximum pressure limiting value of the injection pressure is determined according to the well structure, well head and equipment, and formation fracture pressure limiting conditions; initial injection displacement of 0.1m3Step increasing the displacement in a step-by-step manner until the construction pressure reaches the maximum pressure limiting value; and judging whether the micro fracturing has a fracture point or not based on the construction pressure curve, and stopping the pump immediately if the fracture point occurs.
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