CN112392456B

CN112392456B - Well pattern layout rationality judging method and well pattern layout optimizing method

Info

Publication number: CN112392456B
Application number: CN202011269988.3A
Authority: CN
Inventors: 朱光有; 王萌; 陈志勇; 李婷婷
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2023-07-25
Anticipated expiration: 2040-11-13
Also published as: CN112392456A

Abstract

The invention provides a well pattern layout rationality judging method and a well pattern layout optimizing method. The judging method comprises the following steps: adding a tracer agent into each production well when modifying a segmented reservoir; wherein the types of tracers added into each well are different; monitoring the concentration of different kinds of tracer in the well, namely the adding well and the adjacent well, respectively in the post-pressure drainage and production processes; determining the yield contrast value of each tracer in the own well and the adjacent well based on the concentration values of the tracer in the own well and the adjacent well; and determining the rationality of the well distance between the present well and the adjacent well based on the yield contrast value of each tracer in the present well and the adjacent well. The well pattern layout optimization method is carried out based on a conclusion obtained by the well pattern layout rationality judgment method. The well pattern layout rationality judgment method provided by the invention is suitable for well pattern layout rationality judgment of the shale oil and gas reservoir horizontal well, can realize rationality judgment of the three-dimensional well pattern layout, and is convenient for adjusting the well pattern layout in real time.

Description

Well pattern layout rationality judging method and well pattern layout optimizing method

Technical Field

The invention belongs to the technical field of oil gas development, and particularly relates to a well pattern layout rationality judging method and a well pattern layout optimizing method.

Background

Shale oil gas resources are rich, and the shale oil gas is an important field for oil gas development and utilization in the future. The American shale technical revolution breaks through the profit mode of the traditional oil and gas industry and changes the world energy pattern. Under the conditions that the policy support is in place and the market development is smooth, the shale gas yield in 2020 can reach 200 hundred million square, the yield in 2030 can reach 800-1000 hundred million square, and the total yield in China is more than 30%. Shale oil can reach 500-1000 ten thousand tons in 2030. As an unconventional resource with the characteristic of 'artificial oil and gas reservoirs', staged fracturing is needed in a well which is completely drilled, so that the purposes of improving the yield of a single well and maximally improving the usability of geological reserves are achieved. In general, development of shale reservoirs requires parallel placement of multiple horizontal wells in both planar and vertical directions (as shown in fig. 1). According to the different fracturing processes and scales, the half-length range of the hydraulic fracture is 10-300 meters, so that fracture communication, namely inter-well communication, can occur when a plurality of horizontal wells are fractured, and the yield is adversely affected. Proper well spacing setting should be to fracturing to achieve contact of hydraulic fractures between adjacent wells, but oil and gas are not communicated during production, so that the most reasonable well control oil and gas reserves are ensured.

In the prior art, whether the communication between wells occurs is generally judged according to the change of the wellhead pressure of the temporary well when the well is fractured, but the method cannot judge the communication degree and cannot judge whether the oil gas is communicated. Therefore, judgment of reasonable well spacing and well pattern arrangement are important difficulties facing shale oil reservoir development at present.

CN102930345B provides a gradient algorithm-based adaptive well pattern optimization method, which comprises the steps of obtaining oil reservoir data, establishing a three-dimensional digital oil reservoir geological model, carrying out oil reservoir numerical simulation, then establishing an adaptive regular well pattern unit, and generating well spacing and well pattern arrangement. The method depends on the accuracy of the oil reservoir geological model and the oil reservoir numerical simulation, and can play a great role after the geological data are sufficient and the numerical simulation training accuracy is improved in the middle and later stages of development. But its accuracy is questionable at the early stages of development. In addition, although the method eliminates the influence caused by formation pressure change in the conventional productivity evaluation method, the method does not consider the influence of other geological and engineering factors.

CN201687455U provides a three-dimensional staggered well pattern structure of horizontal well, which is only suitable for optimizing the well pattern arrangement of conventional oil wells for water injection development, and needs long-term economic benefit evaluation to perfect the well pattern arrangement, and is not suitable for the development of unconventional oil fields.

Disclosure of Invention

The invention aims to provide a method suitable for judging rationality of a well pattern layout of a shale oil and gas reservoir horizontal well. The method can realize rationality judgment of the three-dimensional well pattern layout, and is convenient for adjusting the well pattern layout in real time.

In order to achieve the above object, the present invention provides a method for determining rationality of a well pattern layout, wherein the method comprises:

adding a tracer agent into each production well when modifying a segmented reservoir; wherein the types of tracers added into each well are different;

monitoring the concentration of different kinds of tracer in the well, namely the adding well and the adjacent well, respectively in the post-pressure drainage and production processes;

determining the yield contrast value of each tracer in the own well and the adjacent well based on the concentration values of the tracer in the own well and the adjacent well;

based on the relative values of the output of each tracer in the present well and the adjacent well, the rationality of the well spacing between the present well and the adjacent well is determined (namely whether the well spacing between the present well and the adjacent well is reasonable or not is determined).

In the above well pattern layout rationality judging method, the concentrations of different types of tracers produced in the well, namely the added well and the adjacent well, are monitored respectively in the post-pressure drainage and production processes, and based on the concentration values of the different types of tracers produced in the well and the adjacent well, the determination of the yield comparison value of each tracer in the well and the adjacent well can be realized by the following modes:

And respectively monitoring the concentration of different types of tracers in the gas, oil and water produced by the well and the adjacent well in the post-pressure drainage and production process, and determining the quantity of the different types of tracers in the gas, oil and water produced by the well and the adjacent well based on the concentration values of the different types of tracers in the gas, oil and water produced by the well and the adjacent well, thereby determining the yield contrast value of each tracer in the well and the adjacent well.

In the above well pattern layout rationality judging method, preferably, when the producing well is a gas well, the tracer added to the well includes an air-soluble tracer and an optional water-soluble tracer; when the producing well is an oil well, the tracer added to the well includes an oil-soluble tracer and optionally a water-soluble tracer; when the production well is an oil and gas production well, the tracer added to the well comprises an oil-soluble tracer, an air-soluble tracer and optionally a water-soluble tracer.

In the well pattern layout rationality judging method, different tracers can be added into each section, one tracer can be added into each section, other types of tracers can be added into other sections, and the same tracer can be added into all the sections. Preferably, the type of tracer added is different for each section of each well.

In the above method for determining rationality of well pattern layout, preferably, the comparison value of the output of each tracer in the present well and the adjacent well includes the output of each tracer in the adjacent well; the yield of the tracer in a well is the percentage of the yield of the tracer in that well to its total yield (including the sum of its yields in the present well and the adjacent wells); more preferably, determining the rationality of the well spacing between the present well and the adjacent well based on the relative values of the production of each tracer in the present well and the adjacent well comprises:

determining the average value of the productivity of each tracer added into the well in a certain temporary well based on the productivity of each tracer in an adjacent well;

determining rationality of well spacing between the present well and a particular critical well based on an average value of productivity of each tracer added to the present well at the particular critical well; wherein, the liquid crystal display device comprises a liquid crystal display device,

when the average value of the yields of the tracers added into the well in a certain temporary well is zero, the well distance between the well and the temporary well is overlarge;

when the average value of the yields of the tracers added into the well in a certain temporary well is larger than zero and does not exceed a first threshold value, the well distance between the well and the temporary well is reasonable;

when the average value of the yields of each tracer added to the well in a certain temporary well is larger than a first threshold value, the well distance between the well and the temporary well is too small.

In a specific embodiment, the average value of the yields of the tracers added to the present well in a certain temporary well is the average value of the yields of the air-soluble tracers added to the present well in a certain temporary well, and the first threshold value is 5%; namely:

when the average value of the yields of all the gas-soluble tracers added into the well in a certain temporary well is zero, the well distance between the well and the temporary well is overlarge;

when the average value of the yields of all the gas-soluble tracers added into the well in a certain temporary well is more than zero and not more than 5%, the well distance between the well and the temporary well is reasonable;

when the average value of the yields of all the gas-soluble tracers added into the well in a certain temporary well is more than 5%, the well distance between the well and the temporary well is too small;

in a specific embodiment, the average value of the yields of the oil-soluble tracers added to the present well in a certain temporary well is the average value of the yields of the oil-soluble tracers added to the present well in a certain temporary well, and the first threshold value is 5%; namely:

when the average value of the yields of the oil-soluble tracers added into the well in a certain temporary well is zero, the well distance between the well and the temporary well is overlarge;

when the average value of the yields of the oil-soluble tracers added in the well is greater than zero and not more than 5% in a certain temporary well, the well distance between the well and the temporary well is reasonable;

When the average value of the yields of the oil-soluble tracers added into the well in a certain temporary well is more than 5%, the well distance between the well and the temporary well is too small;

in a specific embodiment, the average value of the yields of the tracers added to the present well in a certain temporary well is the average value of the yields of the water-soluble tracers added to the present well in a certain temporary well, and the first threshold value is 10%; namely:

when the average value of the yields of the water-soluble tracers added into the well in a certain temporary well is zero, the well distance between the well and the temporary well is overlarge;

when the average value of the yields of the water-soluble tracers added into the well in a certain temporary well is more than zero and not more than 10%, the well distance between the well and the temporary well is reasonable;

when the average value of the yields of the water-soluble tracers added into the well in a certain temporary well is more than 10%, the well distance between the well and the temporary well is too small;

the rationality of determining the well distance between the present well and the temporary well is preferably: the rationality of the well spacing between the present well and a particular critical well is determined based on an average of the yields of the oil-soluble tracer and/or the gas-soluble tracer added to the present well at the critical well.

In the above well pattern layout rationality judging method, preferably, the method further includes:

When the well distance between a certain well and a temporary well is reasonable, determining the rationality of the fracturing scale of the certain section of the well (namely determining whether the fracturing scale of the certain section of the well is reasonable or not) based on the relative value of the output of the tracer added to the certain section of the well in the present well and the adjacent well;

more preferably, the comparison of the production of the tracer in the well and the adjacent well comprises the sum of the production of the tracer in the adjacent wells; the yield of the tracer in a well is the percentage of the yield of the tracer in that well to its total yield (including the sum of its yields in the present well and the adjacent wells);

further preferably, the determining the rationality of the fracturing scale of a section of the well based on the relative amounts of tracer added to the section of the well produced in the present well and adjacent wells comprises:

when the sum of the productivity of the tracer added to a certain section of the well in each adjacent well is zero, the fracturing scale of the section of the well is too small;

when the sum of the productivity of the tracer added in a certain section of the well in each adjacent well is greater than zero and does not exceed a second threshold value, the fracturing scale of the section of the well is reasonable;

when the sum of the productivity of the tracer added to a certain section of the well in each adjacent well is larger than a second threshold value, the fracturing scale of the section of the well is oversized;

in a specific embodiment, the sum of the yields of the tracer added to a section of the well in each adjacent well is the sum of the yields of the gas-soluble tracer added to a section of the well in each adjacent well, and the second threshold is 10%; namely:

When the sum of the productivity of the gas-soluble tracer added in a certain section of the well in each adjacent well is zero, the fracturing scale of the section of the well is too small;

when the sum of the productivity of the gas-soluble tracer added in a certain section of the well in each adjacent well is more than zero and not more than 10%, the fracturing scale of the certain section of the well is reasonable;

when the sum of the productivity of the gas-soluble tracer added in a certain section of the well in each adjacent well is more than 10%, the fracturing scale of the section of the well is overlarge;

in a specific embodiment, the sum of the yields of the tracer added to a section of the well in each adjacent well is the sum of the yields of the oil solubility added to a section of the well in each adjacent well, and the second threshold is 10%; namely:

when the sum of the yields of the oil-soluble tracer added to a certain section of the well in each adjacent well is zero, the fracturing scale of the section of the well is too small;

when the sum of the productivity of the oil-soluble tracer added in a certain section of the well in each adjacent well is more than zero and not more than 10%, the fracturing scale of the certain section of the well is reasonable;

when the sum of the yield of the oil-soluble tracer added in a certain section of the well in each adjacent well is more than 10%, the fracturing scale of the section of the well is oversized;

in a specific embodiment, the sum of the yields of the tracer added to a section of the well and the yields of the water solubility added to a section of the well and the adjacent wells is 20%; namely:

When the sum of the productivity of the water-soluble tracer added in a certain section of the well in each adjacent well is zero, the fracturing scale of the section of the well is too small;

when the sum of the productivity of the water-soluble tracer added in a certain section of the well in each adjacent well is more than zero and not more than 20%, the fracturing scale of the certain section of the well is reasonable;

when the sum of the productivity of the water-soluble tracer added in a certain section of the well in each adjacent well is more than 20%, the fracturing scale of the section of the well is oversized;

wherein, based on the relative value of the output of the tracer added in a certain section of the well in the present well and the adjacent well, the rationality of the fracturing scale of the section of the well is determined as follows: the rationality of the fracturing scale of a section of the well is determined based on the relative values of the production of the oil-soluble tracer and/or the gas-soluble tracer in the section of the well in the present well and the adjacent well.

The optimal scheme can judge the size of the fracturing scale in the fracturing process of a certain section or a plurality of sections, and is convenient for timely adjusting the fracturing process and the fracturing scale.

In the above method for judging rationality of well pattern layout, preferably, the well pattern is a three-dimensional well pattern.

In the above well pattern layout rationality judging method, preferably, the well pattern includes one or a combination of two or more of a vertical well, a horizontal well and a highly deviated well.

In the above well pattern layout rationality judging method, preferably, the staged reservoir reformation includes synchronous fracturing, asynchronous fracturing or zip fracturing.

In the above method for determining rationality of well pattern layout, preferably, the well spacing of each production well is 100-1000 meters.

The well pattern layout rationality judging method is suitable for carbonate oil gas wells, sandstone oil gas wells, shale oil gas wells and the like, and is particularly suitable for shale oil gas wells.

In the well pattern layout rationality judging method, the well pattern layout range can be a platform or a block.

The invention also provides a well pattern layout optimization method, wherein the method comprises the following steps:

the rationality judgment of the well pattern layout is carried out by using the rationality judgment method of the well pattern layout; and determining a well pattern layout adjustment scheme based on the judgment result.

In the well pattern layout optimization method, a well distance adjustment scheme can be determined according to a rationality judgment result of the well distance; and determining a fracturing scale adjustment scheme according to the fracturing scale rationality judgment result.

According to the well pattern layout rationality judging method provided by the invention, the known quantity of different types of tracers are added during the well segmented reservoir reconstruction, the concentrations of different types of tracers produced in the well and the adjacent well are respectively monitored in the post-pressure drainage and production processes, and the quantitative evaluation of the oil, gas and water ditch conditions between the wells is realized through the yield contrast value of each tracer in the well and the adjacent well, so that the well pattern layout rationality judgment is realized. Compared with the prior art, the technical scheme provided by the invention has the following advantages:

1. The method provided by the invention can judge whether the well pattern arrangement is reasonable in the initial period of drainage and production, and is convenient for adjusting the well pattern arrangement in real time.

2. The method provided by the invention can judge hydraulic communication and oil-gas communication, and does not depend on wellhead pressure and long-term production conditions simply to judge whether the well pattern layout is reasonable.

Drawings

Fig. 1 is a flow chart of a method for determining rationality of a well pattern layout according to an embodiment of the invention.

Fig. 2 is a flow chart of a well pattern layout optimization method according to an embodiment of the invention.

Fig. 3 is a three-dimensional pattern layout of example 1 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.

The principles and spirit of the present invention are described in detail below with reference to several representative embodiments thereof.

Referring to fig. 1, in order to achieve the above object, the present invention provides a method for determining rationality of a well pattern layout, where the method includes:

step S1: adding a tracer agent into each production well when modifying a segmented reservoir; wherein the types of tracers added into each well are different;

step S2: monitoring the concentration of different kinds of tracer in the well, namely the adding well and the adjacent well, respectively in the post-pressure drainage and production processes;

step S3: determining the yield contrast value of each tracer in the own well and the adjacent well based on the concentration values of the tracer in the own well and the adjacent well;

step S4: based on the relative values of the output of each tracer in the present well and the adjacent well, the rationality of the well spacing between the present well and the adjacent well is determined (namely whether the well spacing between the present well and the adjacent well is reasonable or not is determined).

Further, the concentration of different types of tracer produced in the well, namely the addition well and the adjacent well, is monitored respectively in the post-pressure drainage and production process, and based on the concentration values of the different types of tracer produced in the well and the adjacent well, the production quantity comparison value of each tracer in the well and the adjacent well is determined by the following modes:

Further, when the production well is a gas well, the tracer added to the well comprises a gas-soluble tracer and optionally a water-soluble tracer; when the producing well is an oil well, the tracer added to the well includes an oil-soluble tracer and optionally a water-soluble tracer; when the production well is an oil and gas production well, the tracer added to the well comprises an oil-soluble tracer, an air-soluble tracer and optionally a water-soluble tracer.

Wherein, in each well, different tracers can be added in each section, one tracer can be added in each section, other types of tracers can be added in other sections, and the same tracer can be added in all the well sections; further, the type of tracer added is different for each section of each well.

Further, the comparison of the yields of each tracer in the present well and the adjacent well includes the yield of each tracer in the adjacent well; the yield of the tracer in a well is the percentage of the yield of the tracer in that well to its total yield (including the sum of its yields in the present well and the adjacent wells);

further, determining the rationality of the well spacing between the present well and the adjacent well based on the relative values of the production of each tracer in the present well and the adjacent well comprises:

when the average value of the yields of the tracers added into the well in a certain temporary well is larger than a first threshold value, the well distance between the well and the temporary well is too small;

in one embodiment, the average value of the yields of each tracer added to the well in a particular temporary well is the average value of the yields of each gas-soluble tracer added to the well in a particular temporary well, and the first threshold is 5%; namely:

in one embodiment, the average value of the yields of each tracer added to the well in a particular temporary well is the average value of the yields of each oil-soluble tracer added to the well in a particular temporary well, and the first threshold is 5%; namely:

in one embodiment, the average value of the yields of each tracer added to the well in a particular temporary well is the average value of the yields of each water-soluble tracer added to the well in a particular temporary well, and the first threshold is 10%; namely:

When the average value of the yields of the water-soluble tracers added in the well is more than 10% in a certain temporary well, the well distance between the well and the temporary well is too small.

Further, based on the average value of the productivity of each tracer added in the present well in a certain temporary well, the rationality of the well distance between the present well and the temporary well is determined as follows: the rationality of the well spacing between the present well and a particular critical well is determined based on an average of the yields of the oil-soluble tracer and/or the gas-soluble tracer added to the present well at the critical well.

Further, the method further comprises: when the well distance between a certain well and a temporary well is reasonable, determining the rationality of the fracturing scale of the certain section of the well (namely determining whether the fracturing scale of the certain section of the well is reasonable or not) based on the relative value of the output of the tracer added to the certain section of the well in the present well and the adjacent well;

further, the comparison of the production of the tracer in the well and the adjacent well comprises the sum of the production of the tracer in the adjacent well; the yield of the tracer in a well is the percentage of the yield of the tracer in that well to its total yield (including the sum of its yields in the present well and the adjacent wells);

still further, determining the rationality of the fracturing size of a section of the well based on the relative amounts of tracer added to the section of the well produced at the present and adjacent wells comprises:

in one embodiment, the sum of the yields of the tracer added to a section of the well and the yields of the gas-soluble tracer added to a section of the well and the yields of the tracer added to the adjacent wells is 10%; namely:

in one embodiment, the sum of the yields of the tracer added to a section of the well and the yields of the oil solubility added to a section of the well and the yields of the tracer added to the adjacent wells is 10%; namely:

in one embodiment, the sum of the yields of the tracer added to a section of the well and the yields of the water solubility added to a section of the well in each adjacent well is 20%; namely:

when the sum of the productivity of the water-soluble tracer added in a certain section of the well in each adjacent well is more than 20%, the fracturing scale of the section of the well is oversized.

The optimal scheme can judge the size of the fracturing scale in the fracturing of a certain section or a plurality of sections, and is convenient for timely adjusting the fracturing process and scale; further, based on the relative values of the output of the tracer added to a certain section of the well in the present well and the adjacent well, the rationality of the fracturing scale of the section of the well is determined as follows: the rationality of the fracturing scale of a section of the well is determined based on the relative values of the production of the oil-soluble tracer and/or the gas-soluble tracer in the section of the well in the present well and the adjacent well.

Further, the well pattern is a three-dimensional well pattern.

Further, the well pattern includes one or a combination of two or more of a vertical well, a horizontal well, and a highly deviated well.

Further, the staged reservoir reformation includes simultaneous fracturing, unsynchronized fracturing, or zip-type fracturing.

Further, the well spacing of each production well is 100-1000 meters.

Referring to fig. 2, in order to achieve the above objects, the present invention provides a well pattern layout optimization method, wherein the method includes:

step S21: performing well pattern layout rationality judgment by using a well pattern layout rationality judgment method;

step S22: determining a well pattern layout adjustment scheme based on the judgment result;

the well pattern layout rationality judging method comprises the following steps:

step S211: adding a tracer agent into each production well when modifying a segmented reservoir; wherein the types of tracers added into each well are different;

step S212: monitoring the concentration of different kinds of tracer in the well, namely the adding well and the adjacent well, respectively in the post-pressure drainage and production processes;

Step S213: determining the yield contrast value of each tracer in the own well and the adjacent well based on the concentration values of the tracer in the own well and the adjacent well;

step S214: based on the relative values of the output of each tracer in the present well and the adjacent well, the rationality of the well spacing between the present well and the adjacent well is determined (namely whether the well spacing between the present well and the adjacent well is reasonable or not is determined).

Further, the well pattern layout rationality judging method further comprises the following steps: when the well distance between a certain well and a temporary well is reasonable, determining the rationality of the fracturing scale of the certain section of the well (namely determining whether the fracturing scale of the certain section of the well is reasonable or not) based on the relative value of the output of the tracer added to the certain section of the well in the present well and the adjacent well;

Further, the well pattern is a three-dimensional well pattern.

Further, the well spacing of each production well is 100-1000 meters.

The well pattern layout optimization method is suitable for carbonate oil gas wells, sandstone oil gas wells, shale oil gas wells, oil gas wells and the like, and is particularly suitable for shale oil gas wells and oil gas wells.

Example 1

The embodiment provides a three-dimensional well pattern arrangement optimization method, which is used for a shale gas block and comprises the following steps:

step one, arranging a well pattern shown in the figure 3 in a certain shale gas block, wherein 9 wells are arranged in total; the length of each horizontal section of the well is 1600 meters, and the horizontal section is divided into 20 sections, and 180 sections are all arranged; simultaneously adding a water-soluble tracer w during each section of fracturing of each well _xi (10g) And an air-soluble tracer g _xi (10g) The number of the water-soluble tracer and the gas-soluble tracer is 180; where x is the well code number (x=1, 2,3,4,5,6, … …, 9), i is the number of segments (i=1, 2,3,4,5,6, … …, 20), w _xi Code number g of water-soluble tracer added to section i of x well _xi The code number of the gas-soluble tracer added to the section i of the x well;

step two, after fracturing of all wells is completed, draining and producing gas by well opening, and entering a production stage; taking produced water (flowback fluid) and produced natural gas from each well every week, and performing concentration analysis of water-soluble tracer and gas-soluble tracer to obtain concentration data And->And record the water yield (flowback fluid) W of each well per week _jN And the amount G of produced natural gas _jN The method comprises the steps of carrying out a first treatment on the surface of the Wherein j is a positive integer representing the number of weeks, N is the well code number (n=1, 2,3,4,5,6, … …, 9), ->Producing water-soluble tracer w for No. N well of week j _xi Concentration of->Production of gas-soluble tracer g in natural gas for No. N well at week j _xi Concentration of W _jN G for the amount of produced water of the No. N well at the j week _jN The amount of natural gas produced for week N well j;

thirdly, determining the yields of the tracers in the gold and the adjacent wells by utilizing the concentration data of the water-soluble tracer and the gas-soluble tracer of the natural gas and the amount of water produced (flowback fluid) and the amount of the natural gas produced in each week of each well; the yield of the tracer in a well is the percentage of the yield of the tracer in the well to the total yield of the tracer;

the yield of each tracer in this gold and each adjacent well is determined by the following equation:

in the method, in the process of the invention,water-soluble tracer w for ith section of x-well _xi Yield in this well at the previous j weeks, +.>Producing water-soluble tracer w for week j well x _xi Concentration of W _jx The amount of produced water for week j, well x,/->Gas-soluble tracer g for ith section of X-well _xi Yield in this well at the previous j weeks, +. >Production of gas-soluble tracer g in Natural gas for week x well _xi Concentration of G _jx Production of natural gas for week j, well x,/->Water-soluble tracer w for ith section of x-well _xi Yield in its temporary well number M at the previous j weeks, +.>Producing water-soluble tracer w for No. M well at j week _xi Concentration of W _jM Water production for week j, well number M,/->Gas-soluble tracer g for ith section of X-well _xi Yield in its temporary well number M at the previous j weeks, +.>Production of gas-soluble tracer g in natural gas for week j well M _xi Concentration of G _jM The amount of natural gas produced for week j, well number M;

determining the average value of the yields of the tracers added into the well in a certain temporary well based on the yields of the tracers in the adjacent wells; determining rationality of well spacing between the present well and a particular critical well based on an average value of productivity of each tracer added to the present well at the particular critical well; wherein (see table 1),

when the average value of the yields of all the gas-soluble tracers added into the well in a certain temporary well is zero, the well distance between the well and the temporary well is overlarge; when the average value of the yields of all the gas-soluble tracers added into the well in a certain temporary well is more than zero and not more than 5%, the well distance between the well and the temporary well is reasonable; when the average value of the yields of all the gas-soluble tracers added into the well in a certain temporary well is more than 5%, the well distance between the well and the temporary well is too small;

When the average value of the yields of the water-soluble tracers added into the well in a certain temporary well is zero, the well distance between the well and the temporary well is overlarge; when the average value of the yields of the water-soluble tracers added into the well in a certain temporary well is more than zero and not more than 10%, the well distance between the well and the temporary well is reasonable; when the average value of the yields of the water-soluble tracers added into the well in a certain temporary well is more than 10%, the well distance between the well and the temporary well is too small;

when the reasonable conclusion of the well spacing judged by the water-soluble tracer agent is inconsistent, the reasonable conclusion of the well spacing judged by the air-soluble tracer agent is determined to be right;

TABLE 1

Step five, when the well spacing between a certain well and a temporary well is reasonable, determining the sum of the yields of the tracer added in a certain section of the well in each adjacent well based on the yields of the tracer added in the certain section of the well in the local well and the adjacent well, and further determining the rationality of the fracturing scale of the section of the well (namely determining whether the fracturing scale of the section of the well is reasonable or not); wherein (see table 2),

when the sum of the productivity of the gas-soluble tracer added in a certain section of the well in each adjacent well is zero, the fracturing scale of the section of the well is too small; when the sum of the productivity of the gas-soluble tracer added in a certain section of the well in each adjacent well is more than zero and not more than 10%, the fracturing scale of the certain section of the well is reasonable; when the sum of the productivity of the gas-soluble tracer added in a certain section of the well in each adjacent well is more than 10%, the fracturing scale of the section of the well is overlarge;

When the sum of the productivity of the water-soluble tracer added in a certain section of the well in each adjacent well is zero, the fracturing scale of the section of the well is too small; when the sum of the productivity of the water-soluble tracer added in a certain section of the well in each adjacent well is more than zero and not more than 20%, the fracturing scale of the certain section of the well is reasonable; when the sum of the productivity of the water-soluble tracer added in a certain section of the well in each adjacent well is more than 20%, the fracturing scale of the section of the well is oversized;

when the reasonable conclusion of the fracturing scale judged by the water-soluble tracer is inconsistent, the reasonable conclusion of the fracturing scale judged by the gas-soluble tracer is judged to be in order.

TABLE 2

The production rates of the water-soluble tracer and the air-soluble tracer in all sections of the No. 1 well in the present well are 72% and 85% respectively in the first 4 weeks of the completion of the production of the fracturing, the sum of the production rates of the water-soluble tracer and the air-soluble tracer in all sections of the No. 1 well in the adjacent well in the first 4 weeks of the completion of the production of the fracturing is 28% and 15% respectively, the average value of the production rate of the water-soluble tracer in all sections of the No. 1 well in the adjacent well in the first 4 weeks of the completion of the production of the fracturing is 12.5%, the average value of the production rate of the air-soluble tracer in all sections of the No. 1 well in the adjacent well in the first 4 weeks of the completion of the production of the fracturing is 6.5%, and the average value of the production rate of the water-soluble tracer in all sections of the No. 1 well in the adjacent well in the first 4 weeks of the completion of the production of the fracturing in the adjacent well 6 is 8.5%. Indicating that the No. 1 well and the temporary well generate serious hydraulic communication and gas communication.

The production rates of the water-soluble tracer and the air-soluble tracer in all sections of the No. 1 well are 77% and 88.5% respectively in the present well 10 weeks before the completion of the production of the fracturing, the sum of the production rates of the water-soluble tracer and the air-soluble tracer in all sections of the No. 1 well in the adjacent well is 23% and 11.5% respectively in the first 10 weeks after the completion of the production of the fracturing, the average value of the production rate of the water-soluble tracer in all sections of the No. 1 well in the adjacent well 2 well is 10.5% in the first 10 weeks before the completion of the production of the fracturing, the average value of the production rate of the air-soluble tracer in all sections of the No. 1 well in the adjacent well 2 well is slightly higher than 5.0% in the first 10 weeks before the completion of the production of the fracturing, the average value of the production of the water-soluble tracer in all sections of the No. 1 well in the adjacent well 6 well is 12.5% in the first 10 weeks after the completion of the production of the adjacent well 6 well. Indicating that severe hydraulic and pneumatic communication occurred between well number 1 and the temporary well was improved at week 10, but still severe (table 1). The well distance of well 1 on the plane (the well distance between the well 2) and the well distance of 112 m in the longitudinal direction (the well distance between the well 6) are illustrated to be too small.

The production rates of the water-soluble tracer and the air-soluble tracer in the sections 1-19 of the No. 3 well are respectively 83% and 93% in the present well 3 weeks before the completion of the production of the fracturing, the sum of the production rates of the water-soluble tracer and the air-soluble tracer in the sections 1-19 of the No. 3 well in the adjacent well is respectively 17% and 7% in the 3 weeks before the completion of the production of the fracturing, the average value of the production rates of the water-soluble tracer in all sections of the 3 # well in the 2 # well before 3 weeks of the completion of the production of the fracturing is 5.5,3, the average value of the production rates of the water-soluble tracer in all sections of the 3 # well in the 2 # well before 3 weeks of the completion of the production of the fracturing is 2.5,3, the average value of the production rates of the water-soluble tracer in all sections of the 4 # well before 3 weeks of the completion of the production of the fracturing is 4.5,3, the average value of the production rates of the water-soluble tracer in all sections of the 4 # well before 3 weeks of the completion of the production of the fracturing is 1.5,3, the average value of the production rates of the water-soluble tracer in all sections of the 3 # well in the 7 # well before 3 weeks of the completion of the production of the fracturing is 4, the average value of the production rates of the water-soluble tracer in all sections of the 3 # well in the 7 # well before 3 weeks of the completion of the production of the fracturing is 2, the average value of the production of the water-soluble tracer in all sections of the 3 # well before 3 # well in the 3 # well before 3 weeks of the completion of the production of the 3 # well before 3 # well is 8. The water-soluble tracer and the gas-soluble tracer in sections 1-19 of the No. 3 well are respectively 85% and 95% in the current well yield 9 weeks before the completion of the production of the fracturing, the sum of the water-soluble tracer and the gas-soluble tracer in sections 1-19 of the No. 3 well is respectively 15% and 5% in the adjacent well yield 9 weeks before the completion of the production of the fracturing, the average value of the water-soluble tracer in all sections of the No. 3 well is 5.0% in the adjacent well yield 2 in the 9 weeks before the completion of the production of the fracturing, the average value of the gas-soluble tracer in all sections of the No. 3 well is 2.0% in the adjacent well yield 2 in the 9 weeks before the completion of the production of the fracturing, the average value of the water-soluble tracer in all sections of the No. 3 well is 4.0% in the 9 weeks before the completion of the production of the adjacent well yield 4 in the adjacent well, the average value of the production rates of the gas-soluble tracers of all sections of the No. 3 well in the No. 4 temporary well before 9 weeks of the completion of the production of the fracturing is 1.0%, the average value of the production rates of the water-soluble tracers of all sections of the No. 3 well in the No. 7 temporary well before 9 weeks of the completion of the production of the fracturing is 3.5%, the average value of the production rates of the gas-soluble tracers of all sections of the No. 3 well in the No. 7 temporary well before 9 weeks of the completion of the production of the fracturing is 1.5%, the average value of the production rates of the water-soluble tracers of all sections of the No. 3 well in the No. 8 temporary well before 9 weeks of the completion of the production of the fracturing is 2.5%, and the average value of the production rates of the gas-soluble tracers of all sections of the No. 3 well in the No. 8 temporary well before 9 weeks of the completion of the production of the fracturing is 0.5%.

The water-soluble tracer and the gas-soluble tracer in the 20 th section of the No. 3 well are respectively 75% and 85% in the production rate of the well in the 3 weeks before the completion of the production of the fracturing, and the sum of the water-soluble tracer and the gas-soluble tracer in the 20 th section of the No. 3 well and the production rate of the adjacent well is respectively 25% and 15% in the 3 weeks before the completion of the production of the fracturing. The water-soluble tracer and the gas-soluble tracer in the 20 th section of the No. 3 well are 78% and 88% in the present well production rate respectively at 9 weeks before the completion of the production of the fracturing, and the sum of the water-soluble tracer and the gas-soluble tracer in the 20 th section of the No. 3 well and the adjacent well production rate is 22% and 12% in the 9 weeks before the completion of the production of the fracturing respectively.

It is reasonable to demonstrate that the 3-well spacing is 300-400 meters on the plane (spacing from 2-well, spacing from 4-well) and the longitudinal spacing is 158-206 meters (spacing from 7-well, spacing from 8-well) subject, but the fracturing scale needs to be properly controlled at stage 20. Other means prove that the 20 th natural fracture development, the adoption of the same fracturing scale as the 1-19 th natural fracture development can cause hydraulic communication and gas communication between wells.

The production rates of the water-soluble tracer and the air-soluble tracer in all sections of the No. 5 well are 100% and 100% respectively in the present well 3 weeks before the completion of the production of the fracturing, the sum of the production rates of the water-soluble tracer and the air-soluble tracer in all sections of the No. 5 well in the adjacent well is 0% and 0% respectively in the 3 weeks before the completion of the production of the fracturing, the average value of the production rates of the water-soluble tracer in all sections of the No. 5 well in the adjacent well 4 well is 0, the average value of the production rate of the air-soluble tracer in all sections of the No. 5 well in the adjacent well is 0 in the 3 weeks before the completion of the production of the fracturing, and the average value of the production rate of the air-soluble tracer in all sections of the No. 5 well in the adjacent well 9 well is 0 in the 3 weeks before the completion of the production of the adjacent well 9 well. The production rates of the water-soluble tracer and the air-soluble tracer in all sections of the No. 5 well are 100% and 100% respectively in the present well 36 weeks before the completion of the production of the fracturing, the sum of the production rates of the water-soluble tracer and the air-soluble tracer in all sections of the No. 5 well in the adjacent well is 0% and 0% respectively in the 36 weeks before the completion of the production of the fracturing, the average value of the production rates of the water-soluble tracer in all sections of the No. 5 well in the adjacent well 4 well is 0, the average value of the production rate of the air-soluble tracer in all sections of the No. 5 well in the adjacent well is 0 in the 36 weeks before the completion of the production of the fracturing, and the average value of the production rate of the air-soluble tracer in all sections of the No. 5 well in the adjacent well 9 well is 0 in the 36 weeks before the completion of the production of the adjacent well 9 well. The well spacing of well number 5 on the plane was 500 meters (well spacing from well number 4) and the well spacing of well number 255 meters longitudinally (well spacing from well number 9) was too large.

Claims

1. A well pattern layout rationality judging method comprises the following steps:

determining the yield contrast value of each tracer in the own well and the adjacent well based on the concentration values of the tracer in the own well and the adjacent well; wherein the comparison of the yields of each tracer in the present well and the adjacent well includes the yield of each tracer in the adjacent well, the yield of each tracer in a well being the percentage of the yield of each tracer in the well to the total yield;

determining the rationality of the well distance between the present well and the adjacent well based on the yield contrast value of each tracer in the present well and the adjacent well; wherein determining rationality of the well spacing between the present well and the adjacent well based on the relative values of the production of each tracer in the present well and the adjacent well comprises: determining the average value of the productivity of each tracer added into the well in a certain temporary well based on the productivity of each tracer in an adjacent well; determining rationality of well spacing between the present well and a particular critical well based on an average value of productivity of each tracer added to the present well at the particular critical well; when the average value of the yields of the tracers added into the well in a certain temporary well is zero, the well distance between the well and the temporary well is overlarge; when the average value of the yields of the tracers added into the well in a certain temporary well is larger than zero and does not exceed a first threshold value, the well distance between the well and the temporary well is reasonable; when the average value of the yields of each tracer added to the well in a certain temporary well is larger than a first threshold value, the well distance between the well and the temporary well is too small.

2. The method of determining according to claim 1, wherein when the producer well is a gas well, the tracer added to the well comprises an air-soluble tracer; when the production well is an oil well, the tracer added to the well comprises an oil-soluble tracer; when the production well is an oil and gas production well, the tracer added to the well comprises an oil-soluble tracer and a gas-soluble tracer.

3. The method of determining according to claim 2, wherein when the producer well is a gas well, the tracer added to the well comprises a gas-soluble tracer and a water-soluble tracer.

4. The method of determining according to claim 2, wherein when the producing well is an oil well, the tracer added to the well comprises an oil soluble tracer and a water soluble tracer.

5. The method of determining as claimed in claim 2, wherein when the producing well is a hydrocarbon co-well, the tracer added to the well comprises an oil-soluble tracer, an air-soluble tracer and a water-soluble tracer.

6. The method of any one of claims 1-5, wherein the type of tracer added is different for each section of each well.

7. The judgment method according to claim 1, wherein the rationality of the well distance between the present well and a certain temporary well is determined based on an average value of the productivity of each tracer added to the present well in the temporary well as: the rationality of the well spacing between the present well and a particular critical well is determined based on an average of the yields of the oil-soluble tracer and/or the gas-soluble tracer added to the present well at the critical well.

8. The method of claim 7, wherein the average of the yields of each tracer added to the well in a particular critical well is the average of the yields of each gas-soluble tracer added to the well in a particular critical well, and the first threshold is 5%.

9. The method of claim 7, wherein the average of the yields of the oil-soluble tracers from the well to the well is 5% of the average of the yields of the oil-soluble tracers from the well to the well.

10. The method of claim 1, wherein the average of the yields of the respective tracers added to the present well in the certain temporary well is the average of the yields of the respective water-soluble tracers added to the present well in the certain temporary well, and the first threshold is 10%.

11. The judgment method according to claim 6, wherein the method further comprises:

and when the well distance between a certain well and a temporary well is reasonable, determining the rationality of the fracturing scale of the certain section of the well based on the relative value of the output of the tracer added to the certain section of the well in the present well and the adjacent well.

12. The method of claim 11, wherein the comparison of the production of the tracer in the well and the adjacent well comprises the sum of the production of the tracer in the adjacent wells; the yield of the tracer in a well is the percentage of the yield of the tracer in the well to the total yield.

13. The method of claim 12, wherein determining the rationality of the fracturing size of the segment of the well based on the relative values of the production of tracer in the present and adjacent wells by the segment of the well comprises:

when the sum of the yields of the tracer added at each adjacent well is greater than a second threshold value for a section of the well, the section of the well is frac too large.

14. The method of claim 13, wherein determining a rationality index for a zone of the well on a fracturing scale based on a relative value of the production of tracer in the zone of the well in the present and adjacent wells: the rationality of the fracturing scale of a section of the well is determined based on the relative values of the production of the oil-soluble tracer and/or the gas-soluble tracer in the section of the well in the present well and the adjacent well.

15. The method of claim 14, wherein the second threshold is 10% of the sum of the productivity of the tracer in each adjacent well and the productivity of the gas-soluble tracer in each adjacent well for the segment of the well.

16. The method of determining according to claim 14, wherein the sum of the yields of the tracer added to the section of the well and the yields of the oil solubility added to the section of the well in the adjacent wells is 10%.

17. The method of claim 13, wherein the sum of the yields of tracer added to each adjacent well for a segment of the well and the yields of water solubility added to each adjacent well for a segment of the well is 20%.

18. The judgment method according to claim 1, wherein,

the well pattern is a three-dimensional well pattern;

the well pattern comprises one or more than two of a vertical well, a horizontal well and a highly deviated well.

19. The method of judgment of claim 1 wherein the staged reservoir reformation includes simultaneous fracturing, unsynchronized fracturing, or zip fracturing.

20. The method of determining according to claim 1 or 18, wherein the well spacing of each producer well is 100-1000 meters.

21. A well pattern layout optimization method, wherein the method comprises:

performing a wellsite rationality determination using the wellsite rationality determination method of any one of claims 1-20;

and determining a well pattern layout adjustment scheme based on the judgment result.