CN111005717A - Formation fluid pumping method - Google Patents
Formation fluid pumping method Download PDFInfo
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- CN111005717A CN111005717A CN201911191270.4A CN201911191270A CN111005717A CN 111005717 A CN111005717 A CN 111005717A CN 201911191270 A CN201911191270 A CN 201911191270A CN 111005717 A CN111005717 A CN 111005717A
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- viscosity
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- 239000012530 fluid Substances 0.000 title claims abstract description 95
- 238000005086 pumping Methods 0.000 title claims abstract description 88
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000706 filtrate Substances 0.000 claims abstract description 44
- 230000035699 permeability Effects 0.000 claims abstract description 13
- 230000009545 invasion Effects 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000000523 sample Substances 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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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
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/088—Well testing, e.g. testing for reservoir productivity or formation parameters combined with sampling
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a pumping method of a formation fluid, which comprises the following steps: s1, fitting and reproducing a dynamic process of mud invasion and pumping according to pumping data of the adjacent well to obtain the volume of emptied filtrate; fitting according to pumping pressure drop and flow rate of the adjacent well to obtain reservoir permeability; s2, adjusting the numerical value of the fluid viscosity according to the filtrate emptying volume obtained by fitting in the step S1 to obtain a relation curve of the filtrate emptying volume and the fluid viscosity; s3, performing filtrate pumping on the stratum to be pumped until formation fluid appears, and obtaining the filtrate empty volume of the stratum to be pumped; and S4, finding out the corresponding fluid viscosity from the relation curve of the step S2 according to the filtrate empty volume of the formation to be pumped, and selecting a pump with corresponding efficiency according to the obtained fluid viscosity to pump the formation fluid. The method for pumping the formation fluid analyzes the influence of the viscosity of the formation fluid on the pumping process by simulating the pumping process of the formation fluid, and provides a high-efficiency pumping mode for pumping the formation fluid.
Description
Technical Field
The invention relates to the technical field of logging operation, in particular to a formation fluid pumping method.
Background
As the exploration degree is deepened, the pumping sampling project accounts for more and more in the east logging operation of the south China sea. Due to the influence of the viscosity of formation fluid, the pumping and sampling operation usually takes a long time and cannot achieve the purpose of reservoir evaluation, and the eastern part of the south China sea experiences typhoons every year, so that the well bore is soaked by mud for a long time, and the pumping difficulty is increased. Therefore, it is important to improve the overall efficiency of the pumping and sampling operation.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a formation fluid pumping method for improving the pumping efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: there is provided a formation fluid pumping method comprising the steps of:
s1, fitting and reproducing a dynamic process of mud invasion and pumping according to pumping data of the adjacent well to obtain the volume of emptied filtrate; fitting according to pumping pressure drop and flow rate of the adjacent well to obtain reservoir permeability;
s2, adjusting the numerical value of the fluid viscosity according to the filtrate emptying volume obtained by fitting in the step S1 to obtain a relation curve of the filtrate emptying volume and the fluid viscosity;
s3, performing filtrate pumping on the stratum to be pumped until formation fluid appears, and obtaining the filtrate empty volume of the stratum to be pumped;
and S4, finding out the corresponding fluid viscosity from the relation curve of the step S2 according to the filtrate empty volume of the formation to be pumped, and selecting a pump with corresponding efficiency according to the obtained fluid viscosity to pump the formation fluid.
Preferably, in step S1, the pumping data includes pumping pressure drop, pumping capacity, reservoir permeability, fluid viscosity, and formation pressure.
Preferably, in step S2, the filtrate emptying volume and the fluid viscosity are in a quadratic polynomial relationship according to the obtained relationship curve of the filtrate emptying volume and the fluid viscosity.
Preferably, in step S4, if the obtained fluid has a viscosity less than 10cP and belongs to a low viscosity fluid, a high-efficiency large pump or a high-speed mode of a pump is selected for pumping; if the viscosity of the obtained fluid is more than 10cP, the fluid belongs to high-viscosity fluid, and a small pump or the pumping speed is reduced for pumping.
Preferably, the high-efficiency large pump is a pump with a pumping capacity of more than 5 cc/sec, and the high-speed mode of the pump is a mode with a pumping capacity of more than 5 cc/sec;
the small pump is a pump with a pumping capacity of less than 5 cc/sec, and the pump speed is reduced to reduce the pumping capacity to less than 5 cc/sec.
Preferably, in step S3, the filtrate is pumped by a pump with a pumping capacity of more than 5 cc/sec.
The invention has the beneficial effects that: by simulating the pumping process of the formation, the influence of the viscosity of the formation fluid on the pumping process is analyzed, and a high-efficiency pumping mode is provided for the pumping of the formation fluid.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow diagram of a formation fluid pumping method of the present invention;
FIG. 2 is a graph of the relationship between the filtrate void volume and fluid viscosity obtained from the simulation of the present invention.
Detailed Description
Referring to fig. 1, a formation fluid pumping method of the present invention may include the steps of:
s1, fitting and reproducing a dynamic process of mud invasion and pumping according to pumping data of the adjacent well to obtain the volume of emptied filtrate; fitting according to pumping pressure drop and flow rate of the adjacent well to obtain reservoir permeability;
before step S1, according to the stratum to be pumped, the pumped adjacent well with similar lithology and geological deposition to the area where the adjacent well is located is determined.
Pumping data includes pumping pressure drop, pump displacement, reservoir permeability, fluid viscosity, and formation pressure. RCI slim software based on Buckley-Leverett unmiscible flooding theory performs history fitting according to the pumping pressure drop, pump displacement, reservoir permeability, fluid viscosity and formation pressure existing in the adjacent well, reproduces the dynamic process of mud invasion and pumping, and obtains the volume of emptied filtrate (also called breakthrough volume).
And (3) fitting to obtain the permeability of the reservoir according to pumping pressure drop and flow rate of the adjacent well based on RCI slim software of Buckley-Leverett unmiscible flooding theory.
And S2, fitting the obtained empty volume of the filtrate according to the step S1, and adjusting the value of the fluid viscosity to obtain a relation curve of the empty volume of the filtrate and the fluid viscosity, wherein the relation curve is shown in figure 2.
And according to the obtained relation curve of the filtrate emptying volume and the fluid viscosity, the filtrate emptying volume and the fluid viscosity are in a quadratic polynomial relation.
From the analysis of step S2, it can be seen that at low viscosity, the formation fluid flows fast, the pumping time is relatively short, and the volume of the filtrate to be emptied is relatively small; after the reservoir with low formation fluid viscosity is soaked in slurry for a long time, filtrate and formation fluid mainly flow to a well bore probe from a horizontal dominant channel in the pumping process, the vertical flow contribution is relatively small, and a high-speed mode of a large pump or a common pump with high efficiency can be adopted, so that the pressure difference in the pumping process is large, and the formation fluid can flow out conveniently. The larger the drainage area is, the faster the speed of emptying the filtrate is, and the reservoir is suitable for using an oversized probe and is matched with a large pump or a high pump speed mode for pumping operation.
The viscosity of the formation fluid has great influence on the sample extracted by the pump, and the flow of the formation fluid is slow when the viscosity is high; after the stratum with high stratum fluid viscosity is soaked by mud for a long time, compared with a reservoir with strong anisotropy, filtrate and stratum fluid mainly flow to a well probe from a horizontal dominant channel in the pumping process, but the vertical flow contribution also accounts for a large proportion. When the formation fluid breaks through, the small pump is changed or the pump speed is reduced, so that the formation fluid proportion is favorably and quickly increased, and the formation fluid can be quickly sampled.
And S3, performing filtrate pumping on the formation to be pumped until formation fluid appears, and obtaining the filtrate empty volume of the formation to be pumped.
When the filtrate is pumped, it is preferable to use a pump having a pumping capacity of more than 5 cc/sec, such as a large pump having high efficiency or a high-speed mode of the pump.
And S4, finding out the corresponding fluid viscosity from the relation curve of the step S2 according to the filtrate empty volume of the formation to be pumped, and selecting a pump with corresponding efficiency according to the obtained fluid viscosity to pump the formation fluid.
Because the geological deposition of the formation to be pumped is similar to the geological deposition and lithology of the adjacent well selected in the step S1, after the reservoir permeability of the adjacent well is determined, the reservoir permeability of the adjacent well can also be used as the reservoir permeability of the formation to be pumped. Therefore, the filtrate empty volume of the formation to be pumped is substituted into the relation curve of the filtrate empty volume and the fluid viscosity obtained by the pumping data of the well facing, and the corresponding fluid viscosity is obtained.
If the viscosity of the obtained fluid is less than 10cP, the fluid belongs to low-viscosity fluid, and a large pump with high efficiency or a high-speed mode of the pump is selected for pumping. The high-efficiency large pump is a pump with a pumping capacity of more than 5 cc/sec, and the high-speed mode of the pump is a mode with a pumping capacity of more than 5 cc/sec.
If the viscosity of the obtained fluid is more than 10cP, the fluid belongs to high-viscosity fluid, and a small pump or the pumping speed is reduced for pumping. The small pump is a pump with a pumping capacity of less than 5 cc/sec, and the pump speed is reduced to reduce the pumping capacity to less than 5 cc/sec.
In actual operation, adjustment fitting can be carried out according to actually measured reservoir permeability of a stratum to be pumped, when pumping is started, actual pumping pressure drop and flow rate are used for fitting again, the existing model is updated, then whether stratum fluid appears or not is observed, the breakthrough volume (filtrate emptying volume) corresponding to the stratum fluid is obtained, and the corresponding fluid viscosity is found according to the relation curve of the step S2.
If the fluid viscosity is less than 10cP, which is a low viscosity fluid, a high efficiency large pump or a normal high speed pump mode can be used. A fluid with a viscosity greater than 10cP is a high viscosity fluid. During the initial pumping of the filtrate, as in step S3, an efficient large pump or a normal high-speed pump mode can be used, so that the pressure difference during the pumping process is large, and the filtrate can flow out easily. When the formation fluid breaks through, the small pump is changed or the pump speed is reduced, so that the formation fluid proportion is favorably and quickly increased, and the formation fluid can be quickly sampled.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A method of formation fluid pumping, comprising the steps of:
s1, fitting and reproducing a dynamic process of mud invasion and pumping according to pumping data of the adjacent well to obtain the volume of emptied filtrate; fitting according to pumping pressure drop and flow rate of the adjacent well to obtain reservoir permeability;
s2, adjusting the numerical value of the fluid viscosity according to the filtrate emptying volume obtained by fitting in the step S1 to obtain a relation curve of the filtrate emptying volume and the fluid viscosity;
s3, performing filtrate pumping on the stratum to be pumped until formation fluid appears, and obtaining the filtrate empty volume of the stratum to be pumped;
and S4, finding out the corresponding fluid viscosity from the relation curve of the step S2 according to the filtrate empty volume of the formation to be pumped, and selecting a pump with corresponding efficiency according to the obtained fluid viscosity to pump the formation fluid.
2. A formation fluid pumping method according to claim 1, wherein the pumping data comprises pumping pressure drop, pump displacement, reservoir permeability, fluid viscosity and formation pressure in step S1.
3. A formation fluid pumping method according to claim 1, wherein in step S2, the filtrate ullage volume and fluid viscosity exhibit a quadratic polynomial relationship based on the obtained relationship curve between filtrate ullage volume and fluid viscosity.
4. A method of pumping formation fluid according to claim 1, wherein in step S4, if the obtained fluid has a viscosity of less than 10cP and is a low viscosity fluid, a large pump or a high speed mode of pump with high efficiency is selected for pumping; if the viscosity of the obtained fluid is more than 10cP, the fluid belongs to high-viscosity fluid, and a small pump or the pumping speed is reduced for pumping.
5. A formation fluid pumping method according to claim 4, wherein the high efficiency large pump is a pump with a pumping capacity of greater than 5 cc/sec, and the high speed mode of the pump is a pumping capacity greater than 5 cc/sec mode;
the small pump is a pump with a pumping capacity of less than 5 cc/sec, and the pump speed is reduced to reduce the pumping capacity to less than 5 cc/sec.
6. A formation fluid pumping method according to any of claims 1 to 5, wherein the filtrate is pumped in step S3 using a pump with a pumping capacity of greater than 5 cc/sec.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911191270.4A CN111005717B (en) | 2019-11-28 | 2019-11-28 | Formation fluid pumping method |
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| CN201911191270.4A CN111005717B (en) | 2019-11-28 | 2019-11-28 | Formation fluid pumping method |
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| CN111005717B CN111005717B (en) | 2022-05-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030226663A1 (en) * | 2002-06-06 | 2003-12-11 | Baker Hughes Incorporated | Method for in-situ analysis of formation parameters |
| CN1693893A (en) * | 2004-04-30 | 2005-11-09 | 施卢默格海外有限公司 | Method for determining properties of formation fluids |
| CN101255794A (en) * | 2007-02-27 | 2008-09-03 | 普拉德研究及开发股份有限公司 | Logging method for determining characteristic of fluid in a downhole measurement region |
| CN104153982A (en) * | 2014-07-18 | 2014-11-19 | 中国石油天然气股份有限公司 | Method and device for acquiring characteristic curve of underground system of rod-pumped well |
| CN109989743A (en) * | 2019-05-06 | 2019-07-09 | 中海油田服务股份有限公司 | A kind of method and system of determining mud filtrate depth of invasion |
-
2019
- 2019-11-28 CN CN201911191270.4A patent/CN111005717B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030226663A1 (en) * | 2002-06-06 | 2003-12-11 | Baker Hughes Incorporated | Method for in-situ analysis of formation parameters |
| CN1693893A (en) * | 2004-04-30 | 2005-11-09 | 施卢默格海外有限公司 | Method for determining properties of formation fluids |
| CN101255794A (en) * | 2007-02-27 | 2008-09-03 | 普拉德研究及开发股份有限公司 | Logging method for determining characteristic of fluid in a downhole measurement region |
| CN104153982A (en) * | 2014-07-18 | 2014-11-19 | 中国石油天然气股份有限公司 | Method and device for acquiring characteristic curve of underground system of rod-pumped well |
| CN109989743A (en) * | 2019-05-06 | 2019-07-09 | 中海油田服务股份有限公司 | A kind of method and system of determining mud filtrate depth of invasion |
Non-Patent Citations (1)
| Title |
|---|
| 王显南 等: "台风天气对电缆地层流体取样的影响分析-南海作业实例对比", 《2017油气田勘探与开发国际会议（IFEDC 2017）论文集》 * |
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