CN103775061A

CN103775061A - Method for identifying inner interlayer by utilizing well temperature monitoring data

Info

Publication number: CN103775061A
Application number: CN201210405098.XA
Authority: CN
Inventors: 张枫; 蔡银涛; 曹肖萌
Original assignee: China National Petroleum Corp; BGP Inc
Current assignee: China National Petroleum Corp; BGP Inc
Priority date: 2012-10-23
Filing date: 2012-10-23
Publication date: 2014-05-07
Anticipated expiration: 2032-10-23
Also published as: CN103775061B

Abstract

The invention discloses a method for identifying an inner interlayer by utilizing well temperature monitoring data. Temperature inside and outside a well casing pipe is continuously measured through optical fibers, a data table and a changing chart changing with depth are formed according to a time monitoring sequence and the inner interlayer of an oil layer is identified and confirmed. The method for identifying the inner interlayer by utilizing the well temperature monitoring data has the advantages of enabling a thermophysical performance character of the interlayer layer to be considered, enabling a storage layer to be comprehensively and correctively identified in multi-angle, enabling the interlayer to be positioned rapidly and accurately and being benefited to reasonably set reasonable oil deposit exploitation policies meanwhile.

Description

A kind of method of utilizing well temperature monitoring materials identification thick oil pay intraformational bed

Technical field

The present invention relates to oil development technical field, specifically a kind of interior method every interlayer of well temperature monitoring materials identification oil reservoir of utilizing.

Technical background

In oil development, the migration of longitudinal fluid is played to gear effect every interlayer because of its permeability extreme difference in oil reservoir.Packing, the barrier effect of thick oil pay intraformational bed convection cell changed the regularity of distribution of fluid, increased the difficulty that reserves are rationally employed.Therefore, identification and definite thick oil pay in there is important production meaning every interlayer.

Every determining normally based on rock core information and well-log information of interlayer.Describe by core observation, sum up the physical property of different lithology composition under different origins condition, electrically, the feature such as gap structure, microheterogeneity, determine the physical property boundary every interlayer.Then set up the partition mode of non-core hole.Applying non-core hole carries out every interlayer identification, contrast the whole district every interlayer recognition mode.

Above method has just been considered the lithology of rock itself, the attribute such as electrical, and does not consider the hot physical property of rock.Thereby, under interlayer development condition complicated situation, only be sometimes difficult to distinguish the difference every interlayer lithology, physical property with rock core, well logging plate, cause the cognitive deficiency of reservoir, thus impact determining and identification every interlayer.

Summary of the invention

The object of the invention is to provide a kind of method every interlayer in well temperature monitoring materials identification oil reservoir of utilizing of location fast and accurately.

The present invention realizes concrete steps:

1) adopt temperature and the outer temperature measurement data of casing in all casings in distribution type fiber-optic continuous measurement exploratory area;

Data described in step 1) comprise the time of monitoring, the degree of depth and the temperature corresponding to each degree of depth of monitoring.

2) temperature in casing and casing are contrasted outward, determine the temperature monitoring data that use;

Step 2) described contrast standard is in sleeve pipe and the outer thermometric number of sleeve pipe differs and is less than 15 ℃, and fathoming to differ is less than 1m.

3) by step 2) data press time supervision order, formation temperature is with tables of data and the change curve of change in depth;

Curve map abscissa described in step 3) is temperature, and ordinate is the degree of depth;

4) temperature is determined in oil reservoir every interlayer with change in depth Curves Recognition.

Identification described in step 4) is determined:

When curve in figure is finger-type or infundibulate, can not determine every interlayer;

In figure, curve is box-shaped, and the well temperature curve after this time point occurs that temperature is return, is bimodal shape, and the corresponding degree of depth in the return place of temperature is the degree of depth of growing every interlayer.

Because the present invention has taken into full account every the hot physical property characteristic of interlayer, existing on the basis of interlayer research method, contribute to multi-angle, correct understanding reservoir in all directions, locate fast and accurately every interlayer, be also conducive to formulate rational oil reservoir development policy simultaneously.

Accompanying drawing explanation

Fig. 1 is the contrast of the inside and outside temperature logs of sleeve pipe;

Fig. 2 be well temperature monitored data over time;

Fig. 3 is the demonstration that thermal field of the present invention expands to temperature curve after interlayer.

The specific embodiment

Below in conjunction with accompanying drawing and example in detail the present invention.

Collection research district all well temperature observations, comprises temperature measurement data and the outer temperature measurement data of sleeve pipe in the sleeve pipe of the continuous temperature monitoring based on distribution type fiber-optic.Well temperature is observed well and is conventionally non-uniformly distributed in study area.The temperature survey that well temperature is observed well has 2 kinds of systems, and a kind of is that optical fiber temperature is bundled in to the outer temp measuring system of pipe outside sleeve pipe; Another kind is that optical fiber temperature is placed on to temp measuring system in the pipe in sleeve pipe.Because the capacity of heat transmission of stratum and sleeve pipe is different, the temperature data that this two germlines unified test obtains has certain difference.The data class of collecting should comprise monitoring time, the monitoring point degree of depth and temperature corresponding to each degree of depth.

In the process of heavy crude reservoir Simulation on whole pay zones, at heavy crude heat extraction initial stage of development, the heated high-temperature region of oil reservoir and the low-temperature space temperature on oil reservoir top differ larger, therefore, in sleeve pipe, have larger difference with the outer temperature measurement data of sleeve pipe.Along with the prolongation of development time, reservoir temperature difference reduces, substantially just consistent with the temperature measurement data outside sleeve pipe in sleeve pipe.In sleeve pipe and sleeve pipe outward the consistent standard of temperature measurement data be that monitor temperature differs and is less than 15 ℃, fathoming to differ is less than 1m.By data analysis, determine in sleeve pipe and the time point that outside sleeve pipe, temperature measurement data reaches unanimity.Before this time point, can only adopt temperature measurement data outside sleeve pipe, after this time point, the inside and outside temperature measurement data of sleeve pipe all can adopt.As shown in Figure 1, redness represents the outer temperature measurement data of sleeve pipe, the green interior temperature measurement data of sleeve pipe that represents, before one day, the outer temperature measurement data of sleeve pipe shows that vapor chamber height is starkly lower than the vapor chamber height that in sleeve pipe, temperature measurement data shows, and after the aforementioned date, because steam injection time lengthening reservoir temperature difference reduces, the temperature data of the inside and outside monitoring of sleeve pipe reaches unanimity, and this time point latter two temperature measurement data all can be used.But due to the outer thermometric complex process of sleeve pipe, scene temperature measurement data in development late stage sleeve pipe is more.Therefore, the main interior temperature measurement data of sleeve pipe that adopts after this time point.

The time point of pressing well temperature data consistent in every mouthful of definite observation casing of above-mentioned steps 2 and outside sleeve pipe, arranges respectively well temperature monitored data.Reduced data requires corresponding one of each measurement temperature to fathom, in table 1.Following table is the outer thermometric experimental data of sleeve pipe of the present invention, and each thermometric time needs to be organized into temperature with form corresponding to the degree of depth.

The outer temperature measurement data sorting table of table 1 sleeve pipe

the degree of depth	2006/6/30	2006/7/5	2006/7/10	2006/7/18	2006/7/24	2006/8/1	2006/8/9	2006/8/16
									23	24	19	25	18	21	25	27	32
24.25	24	18	23	16	20	23	25	30
									25.5	23	20	22	16	20	23	26	29
26.75	21	20	21	16	19	22	24	27
									28	17	18	19	15	17	20	21	24
29.25	16	17	17	15	16	18	19	21
									30.5	14	14	14	13	14	15	16	17
31.75	12	13	14	13	13	15	15	16
									.。。	。。。	。。。	。。。	。。。	。。。	。。。	。。。	。。。

Curve map abscissa described in step 3) is temperature, and ordinate is the degree of depth.

The temperature measurement data of putting in order with each monitoring point is drawn the curve of temperature with change in depth, and classifies according to the shape of curve.Specific practice is: if the shape of different time temperature measurement data is consistent, the temperature logs of these times is placed on to a Tu Daonei, if certain time temperature logs shape or temperature have increased by a relatively large margin, the temperature logs of this time is placed on to another Tu Daonei, sees Fig. 2 experimental data.

Identification described in step 4) is determined: when the curve in figure is finger-type or infundibulate, can not determine every interlayer; In figure, curve is box-shaped, and the well temperature curve after this time point occurs that temperature is return, is bimodal shape, and the corresponding degree of depth in the return place of temperature is the degree of depth of growing every interlayer.

The hot physical property characteristic parameter that characterizes rock comprises: heat conduction, specific heat, thermal expansion.Coefficient of thermal conductivity is the parameter that characterizes rock heat conductivility.Specific heat refers to a heat that absorbed or discharged when 1 gram of rock temperature raises or reduces by 1 ℃.Thermal expansion refers to the variation of Yin Wendu and the rock shape that causes and the variation of volume.Core experiment result shows, different lithology has obvious difference every, the coefficient of thermal conductivity of interlayer, specific heat, thermal expansion parameters.Conventionally mud stone is the highest every interlayer specific heat, coefficient of expansion maximum, and the capacity of heat transmission is placed in the middle; Shale sand (gravel) rock is poor every the interlayer capacity of heat transmission, and heat absorption capacity and swelliong power are lower; Calcareous (grey shale) sandstone is every interlayer, and heat conduction is the fastest, absorbs heat minimum.

According to the hot physical property characteristic of different rocks, thick oil pay reservoir temperature logs temperature is consistent, and physical property interlayer place place, due to poor thermal conductivity, can occur the return of temperature on well temperature monitoring curve, forms bimodal shape structure.The degree of depth corresponding to the return place of temperature is the position every interlayer place.

As shown in Figure 3, the temperature of g2 well vapor chamber is 240 ℃ of left and right, and the altitude range of vapor chamber is about 610-650m, and at degree of depth 620m place, the temperature measurement data of each time, all lower than vapor chamber temperature, occurs that temperature is return, forms bimodal shape.In like manner, g3 well, at degree of depth 620m place, shows the return feature of temperature equally, occurs bimodal shape.Illustrate at degree of depth 620m place and have interlayer.

Claims

1. utilize the method every interlayer in well temperature monitoring materials identification oil reservoir, feature is to realize by following concrete steps:

2) temperature in casing and the outer contrast of casing are determined to the temperature monitoring data that use;

4) temperature is determined in oil reservoir every interlayer with the identification of change in depth curve map.

2. according to the method for claim 1, feature is the time that comprises monitoring of the data described in step 1), the degree of depth and the temperature corresponding to each degree of depth of monitoring.

3. according to the method for claim 1, feature is step 2) described contrast determines to be in sleeve pipe and the outer thermometric number of sleeve pipe differs and is less than 15 ℃, fathoming to differ is less than 1m.

4. according to the method for claim 1, feature is that the curve map abscissa described in step 3) is temperature, and ordinate is the degree of depth.

5. according to the method for claim 1, feature is that the identification described in step 4) is determined and is:

When curve in curve map is finger-type or infundibulate, can not determine every interlayer;

In curve map, curve is box-shaped, and the well temperature curve after this time point occurs that temperature is return, is bimodal shape, and the corresponding degree of depth in the return place of temperature is the degree of depth of growing every interlayer.