CN114059958B - Method for determining performance parameters of non-directional intelligent plugging system of suture net system - Google Patents
Method for determining performance parameters of non-directional intelligent plugging system of suture net system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 41
- 230000035699 permeability Effects 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 230000005465 channeling Effects 0.000 claims abstract description 8
- 239000002981 blocking agent Substances 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims abstract 2
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
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- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 239000012530 fluid Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- 239000013049 sediment Substances 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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- 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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- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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Abstract
The invention relates to a method for determining performance parameters of a non-directional intelligent plugging system of a suture network system, which comprises the following steps: determination of blocking agent concentration C in solution i Injection viscosity [ mu ] at time i Coefficient of residual resistance RRf i The method comprises the steps of carrying out a first treatment on the surface of the Determination of the ratio Q of the split amounts of injected water at different permeation rate steps 1 /Q 2 The method comprises the steps of carrying out a first treatment on the surface of the Determination of the ratio Q of the liquid split amounts of the plugging agent at different permeation rate steps 1 `/Q 2 And (2) a step of performing; after the plugging agent is glued, measuring the ratio Q of the liquid distribution amount of the subsequent injected water under different permeability level differences 1 ″/Q 2 "C"; drawing an abscissa of [ mu ] i RRf on the ordinate i The variables are Q respectively 1 `/Q 2 `、Q 1 ″/Q 2 "contour curves; at the time of guaranteeing Q 1 `/Q 2 `＞Q 1/ /Q 2 And Q is 1 ″/Q 2 ″＜Q 1 /Q 2 On the premise of Q 1 ″/Q 2 The injection viscosity and residual resistance coefficient corresponding to the lowest point of the curve are the optimal performance parameters that the plugging agent selectively enters the channeling channel under the permeability level difference and performs effective plugging. According to the invention, reasonable performance parameters of the plugging agent system can be selected according to different permeability level differences, and technical guidance is provided for deep profile control construction.
Description
Technical Field
The invention relates to a method for determining performance parameters of a non-directional intelligent plugging system of a stitch net system, and belongs to the field of oil-gas field development.
Background
In recent years, along with the continuous deep oil and gas exploration in China, dense, shale and other unconventional oil reservoirs become the key points and hot spots of the current energy development. The dense oil reservoir is generally mined by adopting a horizontal well and fracturing transformation mode, but because of serious heterogeneous sediments in China, a fracture network structure is complex after the reservoir is transformed, the liquid production section of the horizontal well is unbalanced in the water injection process, water content is abnormally increased, and channeling is serious, so that the injection water is not circulated effectively, and the mining effect of the horizontal well is seriously restricted. The purpose of controlling water and increasing oil can be achieved by controlling local problems and balancing the liquid production profile. Chemical water shutoff of a horizontal well is one of the most common water shutoff means, and how to enable a plugging agent system to automatically identify and enter a water outlet position to effectively plug is a key of water shutoff of the horizontal well, but because the water outlet position cannot be accurately positioned, water shutoff construction is caused to have blindness and accidental, and the water shutoff effect is difficult to guarantee.
Therefore, the directional water finding problem of the horizontal well with high water content is focused by a plurality of students at home and abroad, and the most mechanical blocking technology is currently applied. 2014, wang Bai and the like invent a multi-section fracturing horizontal well section simultaneous sampling water-finding pipe column and a working method thereof (CN 104100234A), and the water level and the water yield are judged through the liquid production conditions and the like in each section; 2018, luo Yougang et al invented a horizontal well stationary pipe column multi-parameter combination test quick water finding pipe column and method (CN 105114061B), and the water horizon is represented according to the pressure and other parameters of each clamping section; in 2020, liu Zhongneng et al invented a horizontal well quick water finding technique (CN 107339096B) in which the water breakthrough position is determined mainly by narrowing the range of packer injection points step by step. The method is to find the water plugging data to be used as the judgment standard of the plugging agent injection position.
The main reason for well flooding in a slotted network system is that injected water flows along cracks with high diversion capacity, so that whole-well flooding is caused, namely, the difference of reservoir permeability is an important factor of horizontal well flooding. Therefore, under the underground ' black box ' environment, the plugging agent system effectively plugs water channeling cracks, injection viscosity and residual resistance coefficient are important factors for determining effective plugging (Sang Haibo, pu Chunsheng. HPAM weak gel initial viscosity and micro crack width matching relation experimental research. Drilling and production process 2016; cheng Jiecheng. Plugging method and application of low initial viscosity controllable polymer gel in oil reservoir deep superior seepage channels, petroleum theory report 2020; zhang Bing. Ultra-low permeability oil reservoir micro crack deformation rule and profile control dynamics characteristic research, chinese university doctor's paper 2016). The researches are all that the plugging effect of the plugging agent is definitely required to be judged under the specific plugging condition, the factors influencing the plugging are single, and the corresponding knowledge can be effectively obtained. However, aiming at the problem that a water flow channeling channel cannot be determined in a complex stitch net system, a plugging system can intelligently enter the channeling channel and can be plugged effectively, and no system selection method exists at present.
Disclosure of Invention
The invention aims to provide a method for determining performance parameters of a non-directional intelligent plugging system of a seam network system, which has the advantages of reliable principle and simple and convenient operation, effectively solves the problem that injected water is seriously crossflow under the condition of seam network reconstruction and can not effectively supplement stratum energy, can select reasonable performance parameters of the plugging agent system under the condition of different permeability level differences, and provides technical guidance for deep profile control site construction process.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
The invention utilizes the theory principle of two-phase Darcy seepage, and can more accurately obtain the system performance parameters for effectively plugging the water channeling channels under the condition of a seam network by the relation between the liquid dividing amount ratio of the plugging agent system under different permeability level differences and the injection viscosity and residual resistance coefficient of the plugging agent, thereby providing basic data for screening the plugging agent for the reservoir plugging with different permeability level differences.
A method for determining performance parameters of a non-directional intelligent plugging system of a suture network system sequentially comprises the following steps:
1) The concentration of the plugging agent adopted in the determination is C i Injection viscosity [ mu ] at time i Coefficient of residual resistance RRf i I=1, 2, …, n, the injection viscosity [ mu ] i The residual drag coefficient RRf as measured by Brookfield DV-III viscometer i The ratio of water phase permeability before and after plugging agent injection;
2) Determining the ratio of the split amounts of the injected water at different permeability level differences, namely the high permeability crack permeability K 1 And low permeability to cracks K 2 Ratio K of (2) 1 / K 2 The liquid dividing amount is the entering amount of the injected water in the hypertonic cracks and the hypotonic cracks, and the liquid dividing amount of the injected water in the hypertonic cracks and the hypotonic cracks is Q respectively 1 、Q 2 The ratio of the liquid split amount of the injected water under different permeability level differences is Q 1 /Q 2 ；
3) Measuring the ratio of the liquid dividing amount of the plugging agent under different permeability level differences, wherein the liquid dividing amount of the plugging agent in the hypertonic cracks and the hypotonic cracks is Q respectively 1 `、Q 2 The ratio of the liquid dividing amount of the plugging agent under different permeability level differences is Q 1 `/Q 2 The larger the value, the easier the plugging agent enters into the hypertonic cracks;
4) After the plugging agent is glued, the ratio of the liquid dividing amount of the subsequent injection water under different permeability level differences is measured, and the liquid dividing amount of the subsequent injection water in the hypertonic cracks and the hypotonic cracks is Q 1 ″、Q 2 If the ratio of the liquid split amount of the subsequently injected water under different permeability level differences is Q 1 ″/Q 2 The smaller the value is, the easier the subsequent injected water enters the hypotonic crack, and the better the plugging effect of the plugging agent is;
5) Drawing an abscissa of [ mu ] i RRf on the ordinate i The variables are Q respectively 1 `/ Q 2 `、Q 1 ″/ Q 2 "contour curves, abbreviated Q 1 `/ Q 2 `、Q 1 ″/ Q 2 "Curve";
6) According to Q 1 `/ Q 2 Curve, select Q 1 `/ Q 2 `＞Q 1/ /Q 2 Corresponding injection viscosity [ mu ] i Coefficient of residual resistance RRf i Determining that the plugging agent can selectively enter the hypertonic cracks under the permeability level difference;
7) According to Q 1 ″/ Q 2 "Curve, in assurance Q 1 `/ Q 2 `＞Q 1/ /Q 2 On the premise of (1) selecting Q 1 ″/ Q 2 ″＜Q 1 /Q 2 Corresponding injection viscosity [ mu ] i Coefficient of residual resistance RRf i Determining that the plugging agent can effectively plug the hypertonic cracks under the permeability level difference;
8) At the time of guaranteeing Q 1 `/ Q 2 `＞Q 1/ /Q 2 And Q is 1 ″/ Q 2 ″＜Q 1 /Q 2 On the premise of Q 1 ″/ Q 2 Plugging agent injection viscosity [ mu ] corresponding to lowest point of curve i And residual drag coefficient RRf i The optimal performance parameters of the plugging agent which can selectively enter the channeling channel and effectively plug under the permeability level difference are obtained.
According to the invention, on the premise of meeting the complex seam system conditions and improving the requirements of the extraction degree, the values of the performance parameters of the plugging agent system under different crack permeability level differences can be determined, and a basis is provided for the selection of the performance parameters of the plugging agent under different permeability level differences.
Drawings
FIG. 1 is a graph of Q for different plugging agents at different permeation levels 1 `/ Q 2 And (5) a curve.
FIG. 2 is a graph of Q for subsequent injection of water at different permeability levels 1 ″/ Q 2 "Curve".
Detailed Description
The invention is further described below with reference to the drawings and examples to facilitate an understanding of the invention by those skilled in the art. It should be understood that the invention is not limited to the precise embodiments, and that various changes may be effected therein by one of ordinary skill in the art without departing from the spirit or scope of the invention as defined and determined by the appended claims.
Penetration by cracksThe rate difference 479 is taken as an example, and the influence of the plugging agent characteristic on the plugging effect is studied by using a numerical simulation means. The injection viscosities were sequentially selected to be 10 mPas, 20 mPas, 40 mPas, 60 mPas, 80 mPas, and 100 mPas, respectively, and the residual resistance coefficients were 1, 10, 20, 30, 40, and 50, respectively. When the crack permeability level difference 479 is reached, the ratio Q of the liquid dividing amount of the injected water in different cracks in the water injection process 1 /Q 2 =3.2. And drawing a contour diagram of the ratio of the fluid split amount of the injected plugging agent and the subsequent injected water in the high-permeability layer to the low-permeability layer to the injection viscosity and the residual resistance coefficient in sequence, wherein the contour diagram is shown in figures 1 and 2.
Fig. 1 shows the entry behavior of the plugging agent into the fracture, and fig. 2 shows the plugging effect of the plugging agent.
From FIG. 2, it is found that the technical requirements of "get in and get out, get blocked" can be satisfied simultaneously, the injection viscosity of the blocking agent system is 35 mPa.s, and the residual resistance coefficient is 15. Under the condition, the plugging agent can intelligently enter the largest permeable reservoir under the condition, effectively reduce the water phase permeability of the permeable layer, realize plugging of the water phase and improve the development effect.
The foregoing is merely illustrative of the preferred embodiments of the invention, and it is to be understood that the invention is not limited to the specific details disclosed herein and that modifications and variations may be made without departing from the spirit of the invention.
Claims (2)
1. A method for determining performance parameters of a non-directional intelligent plugging system of a suture network system sequentially comprises the following steps:
1) Determination of blocking agent concentration C in solution i Injection viscosity [ mu ] at time i Coefficient of residual resistance RRf i ，i=1，2，…，n；
2) Determining the ratio of the split amounts of the injected water at different permeability level differences, namely the high permeability crack permeability K 1 And low permeability to cracks K 2 Ratio K of (2) 1 / K 2 The liquid dividing amount is the entering amount of the injected water in the hypertonic cracks and the hypotonic cracks, and the liquid dividing amount of the injected water in the hypertonic cracks and the hypotonic cracks is Q respectively 1 、Q 2 Then injection is performedThe ratio of the liquid dividing amount of water under different permeability level differences is Q 1 /Q 2 ；
3) Measuring the ratio of the liquid dividing amount of the plugging agent under different permeability level differences, wherein the liquid dividing amount of the plugging agent in the hypertonic cracks and the hypotonic cracks is Q respectively 1 `、Q 2 The ratio of the liquid dividing amount of the plugging agent under different permeability level differences is Q 1 `/Q 2 `；
4) After the plugging agent is glued, the ratio of the liquid dividing amount of the subsequent injection water under different permeability level differences is measured, and the liquid dividing amount of the subsequent injection water in the hypertonic cracks and the hypotonic cracks is Q 1 ″、Q 2 If the ratio of the liquid split amount of the subsequently injected water under different permeability level differences is Q 1 ″/Q 2 ″；
5) Drawing an abscissa of [ mu ] i RRf on the ordinate i The variables are Q respectively 1 `/ Q 2 `、Q 1 ″/ Q 2 "contour curves, abbreviated Q 1 `/ Q 2 `、Q 1 ″/ Q 2 "Curve";
6) According to Q 1 `/ Q 2 Curve, select Q 1 `/ Q 2 `＞Q 1/ /Q 2 Corresponding injection viscosity [ mu ] i Coefficient of residual resistance RRf i Determining that the plugging agent can selectively enter the hypertonic cracks under the permeability level difference;
7) According to Q 1 ″/ Q 2 "Curve, in assurance Q 1 `/ Q 2 `＞Q 1/ /Q 2 On the premise of (1) selecting Q 1 ″/ Q 2 ″＜Q 1 /Q 2 Corresponding injection viscosity [ mu ] i Coefficient of residual resistance RRf i Determining that the plugging agent can effectively plug the hypertonic cracks under the permeability level difference;
8) At the time of guaranteeing Q 1 `/ Q 2 `＞Q 1/ /Q 2 And Q is 1 ″/ Q 2 ″＜Q 1 /Q 2 On the premise of Q 1 ″/ Q 2 Plugging agent injection viscosity [ mu ] corresponding to lowest point of curve i And residual drag coefficient RRf i Namely, the plugging agent can selectively enter the channeling under the permeability level differenceAnd the flow channel is subjected to optimal performance parameters for effective blocking.
2. A method for determining performance parameters of a non-directional intelligent plugging system of a suture network system by using the method as claimed in claim 1, wherein the injection viscosity [ mu ] is as follows i The residual drag coefficient RRf as measured by Brookfield DV-III viscometer i Is the ratio of the water phase permeability before and after the plugging agent is injected.
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