CN112766622A - Method for evaluating damage of reservoir of newly-produced gas well - Google Patents
Method for evaluating damage of reservoir of newly-produced gas well Download PDFInfo
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Abstract
The invention relates to the field of oil and gas field development, in particular to a damage evaluation method for a newly-put-into-production gas well reservoir, which comprises the steps of obtaining the original formation pressure of a target reservoir of a gas well and the bottom static pressure of the gas well after completion, and obtaining the actual pressure loss value of the target reservoir by making a difference between the bottom static pressure and the original formation pressure; determining a theoretical pressure loss value of the target reservoir at the initial production stage according to the starting pressure gradient of the target reservoir and the gas leakage radius of the gas well at the initial production stage; and obtaining the pressure loss of the target reservoir damage by subtracting the actual pressure loss value and the theoretical pressure loss value of the target reservoir. The pressure loss of the target reservoir damage can be obtained by utilizing the existing pressure test data of the gas well and simple reservoir mobility analysis, so that the reservoir damage degree of a newly produced gas well is quantitatively evaluated, additional well testing operation or complex experiment is avoided, and the reservoir damage degree is obtained more simply, conveniently, quickly and economically.
Description
Technical Field
The invention relates to the field of oil and gas field development, in particular to a method for evaluating damage of a reservoir of a newly-produced gas well.
Background
The natural gas reservoir generally has the characteristic of strong hydrophilicity, and in the operation processes of drilling, fracturing and the like, external working fluid easily enters the reservoir under the action of high capillary force and occupies a flow channel in a near wellbore zone to cause damage to the reservoir in the near wellbore zone, so that the seepage capability of the reservoir is reduced, the gas production capability of a gas well is greatly restricted, and even the gas well cannot normally produce.
Reservoir damage is one of the main causes affecting the normal production of gas wells, and therefore, research on reservoir damage is always the focus of research on field engineers and researchers. And the evaluation of the damage degree of the reservoir is the basis of reservoir damage research and damage relief. Only through accurate evaluation of the damage degree of the reservoir, a corresponding solution can be made in a targeted manner, and the productivity of the gas well is recovered.
At present, the existing reservoir damage evaluation methods mainly include two types: firstly, the permeability loss of the rock core after the external fluid enters is simulated through an indoor rock core experiment, and then the damage degree is evaluated, but the method needs to be completed through a complex experiment, the consumed time is long, meanwhile, the obtained result only can represent the reservoir loss under the experimental condition, and the actual fluid invasion condition and the actual damage degree of the reservoir cannot be accurately and quantitatively represented; and secondly, the damage degree of the reservoir of the gas well is evaluated by developing a well test after the completion of the gas well and explaining well test data, and the method is more accurate, but needs additional well test operation, and is high in cost and long in time consumption.
Disclosure of Invention
The invention aims to provide a new method for evaluating damage of a gas well reservoir in production, which is used for solving the problems of complexity and long time consumption of the existing method for evaluating damage of the gas well reservoir.
In order to achieve the aim, the invention provides a new production gas well reservoir damage evaluation method, which comprises the following steps:
1) acquiring original formation pressure of a target reservoir of a gas well and bottom static pressure of the gas well after completion, and subtracting the bottom static pressure and the original formation pressure to obtain an actual pressure loss value of the target reservoir;
2) determining a theoretical pressure loss value of the target reservoir at the initial production stage according to the starting pressure gradient of the target reservoir and the gas leakage radius of the gas well at the initial production stage;
3) and (4) obtaining the pressure loss of the target reservoir damage by subtracting the actual pressure loss value and the theoretical pressure loss value of the target reservoir, and determining the reservoir damage degree of the newly-put-into-production gas well according to the pressure loss of the target reservoir damage.
The reservoir damage degree evaluation method has the advantages that the reservoir pressure loss caused by reservoir damage can be calculated by utilizing the original formation pressure, the bottom hole static pressure, the starting pressure gradient and the air leakage radius of the target reservoir, namely the reservoir pressure loss caused by the reservoir damage of the pressure loss of the target reservoir damage can be obtained by utilizing the existing pressure test data of the gas well and simple reservoir fluidity analysis, the reservoir damage degree of a newly-put-into-production gas well is quantitatively evaluated, extra well test operation or complex experiments are avoided, and the reservoir damage degree is more simply, conveniently, quickly and economically obtained.
Further, when no production well exists around, in order to simply and accurately obtain the original formation pressure of the target reservoir, if no production well exists in the set range of the gas well, the formation initial pressure value measured by the earlier exploration well in the same flow unit as the gas well is used as the original formation pressure.
Further, when a production well is arranged in the same flow unit, in order to simply and accurately obtain the original formation pressure of the target reservoir, if the production well is arranged in the flow unit where the gas well is located, the original formation pressure of the target reservoir of the gas well is obtained according to the pressure recovery well testing data of the production well.
Further, if a plurality of production wells are arranged in the flow unit where the gas well is located, the original formation pressure of the target reservoir of each production well is obtained according to the pressure recovery well testing data of each production well, the original formation pressures of the target reservoir of each production well are averaged, and the average value is used as the original formation pressure of the target reservoir of the gas well. When a plurality of production wells exist, the original formation pressure of the target reservoir can be more accurately expressed by calculating the average value.
Further, in order to simply, quickly and accurately obtain the starting pressure gradient, the starting pressure gradient of the target reservoir is obtained by testing the actual core of the gas well or the core with the same physical property as the actual core of the gas well under the reservoir condition.
Further, in order to enable the bottom hole static pressure to reflect the static pressure of the target reservoir more accurately, the bottom hole static pressure is obtained by measuring the pressure in the middle of the target reservoir.
Drawings
FIG. 1 is a flow chart of a method for evaluating reservoir damage of a new producing gas well according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a new production gas well reservoir damage evaluation method, the flow of the method is shown in figure 1, and the method specifically comprises the following steps:
1) and acquiring the original formation pressure of the target reservoir of the gas well and the bottom static pressure of the gas well after completion, and subtracting the bottom static pressure from the original formation pressure to obtain the actual pressure loss value of the target reservoir.
In this embodiment, the bottom hole static pressure of the target reservoir after completion of the gas well is obtained by measuring the pressure in the middle of the target reservoir. In the embodiment, when the original formation pressure of a target reservoir of a gas well is calculated, if the gas well is a new block of the gas well or has no production well within the range of the gas leakage radius multiplied by 2, the formation initial pressure value measured by a previous exploration well in the same flow unit as the gas well is used as the original formation pressure of the target reservoir of the gas well; and if a production well is arranged in the flow unit where the gas well is located, recovering the well testing data according to the pressure of the production well to obtain the original formation pressure of the target reservoir of the gas well. As other embodiments, the virgin formation pressure of the target reservoir of the gas well may also be obtained according to other prior art means.
In addition, if a plurality of production wells are arranged in the flow unit where the gas well is located, the formation pressure of the target reservoir is obtained according to the pressure recovery well testing data of each production well, the formation pressures obtained by each production well are averaged, the average value is used as the original formation pressure of the target reservoir of the gas well, and the real original formation pressure of the gas well can be more accurately expressed.
2) And determining a theoretical pressure loss value of the target reservoir at the initial production stage according to the starting pressure gradient of the target reservoir and the gas leakage radius of the gas well at the initial production stage.
The starting pressure gradient of the target reservoir is obtained by testing the actual core of the gas well or the core with the same physical property as the actual core of the gas well under the reservoir condition, wherein the reservoir condition comprises conditions such as pressure, temperature and water saturation. The gas well gas leakage radius of a target reservoir in the initial production period can be calculated by the conventional technical means, and the initial production period refers to the period within one month.
3) And (4) subtracting the actual pressure loss value and the theoretical pressure loss value of the target reservoir to obtain the pressure loss caused by the damage of the target reservoir, so that the reservoir damage degree of the newly-put-into-production gas well can be quantitatively evaluated.
The steps are suitable for gas wells developed in a single layer and gas wells developed in multiple layers, and for the gas wells developed in multiple layers, the bottom hole static pressure and the starting pressure gradient can be respectively tested for each layer, the actual pressure loss and the theoretical pressure loss of the reservoir in each layer are calculated, and the damage degree of the reservoir in each layer is further obtained.
The invention provides two groups of specific gas well damage degree evaluation processes:
and testing the bottom hole static pressure by descending a pressure gauge after completing a certain dense gas reservoir X1 well in the basin E, wherein the pressure gauge is arranged at 3017m from the middle part of the target reservoir, and the bottom hole static pressure is 25.75MPa after testing. The original formation pressure of the target reservoir is 27.48MPa through the analysis of pressure recovery well test data of production wells in the same flow unit of the X1 well. Through an indoor experiment, the starting pressure gradient of a target reservoir is obtained through testing and is 0.018MPa/m, and the gas leakage radius of an X1 well in the initial production period under the reservoir condition is obtained through calculation and is 76 m.
Therefore, the actual pressure loss value of the target reservoir is 1.73MPa, the theoretical pressure loss value of the target reservoir is 1.37MPa, and the actual formation pressure loss of the X1 well caused by reservoir damage is obtained by difference and is only 0.36MPa higher and 26% higher than the theoretical pressure loss, so that the reservoir damage degree of the X1 well is weaker.
And testing the bottom hole static pressure by putting a pressure gauge into the well after completing the well of a certain dense gas reservoir X2 in the basin E, wherein the pressure gauge is 3155m from the middle part of the target reservoir, and the bottom hole static pressure is 19.81MPa through testing. The X2 well is a first production well in the same flow unit, and the initial pressure value of the stratum measured by the earlier exploration well in the same flow unit is 28.44MPa, namely the initial stratum pressure of the target reservoir of the X2 well. Through indoor experiments, the starting pressure gradient of a target reservoir is obtained through testing and is 0.023MPa/m, and the gas leakage radius of an X2 well at the initial production stage under the reservoir condition is obtained through calculation and is 58 m.
Therefore, the actual pressure loss value of the target reservoir is 8.63MPa, the theoretical pressure loss value of the target reservoir is 1.33MPa, and the actual formation pressure loss of the X2 well caused by reservoir damage is 7.3MPa higher than the theoretical pressure loss and is up to 549% by difference, so the reservoir damage degree of the X2 well is serious.
The present invention has been described in relation to particular embodiments thereof, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
Claims (6)
1. A new production gas well reservoir damage evaluation method is characterized by comprising the following steps:
1) acquiring original formation pressure of a target reservoir of a gas well and bottom static pressure of the gas well after completion, and subtracting the bottom static pressure and the original formation pressure to obtain an actual pressure loss value of the target reservoir;
2) determining a theoretical pressure loss value of the target reservoir at the initial production stage according to the starting pressure gradient of the target reservoir and the gas leakage radius of the gas well at the initial production stage;
3) and (4) obtaining the pressure loss of the target reservoir damage by subtracting the actual pressure loss value and the theoretical pressure loss value of the target reservoir, and determining the reservoir damage degree of the newly-put-into-production gas well according to the pressure loss of the target reservoir damage.
2. The method for evaluating reservoir damage of a new producing gas well according to claim 1, characterized in that if no production well exists in the set range of the gas well, the initial pressure value of the stratum measured by an earlier exploratory well in the same flow unit as the gas well is used as the original stratum pressure.
3. The method for evaluating reservoir damage of a new producing gas well according to claim 1, characterized in that if a production well exists in the flow unit of the gas well, the original formation pressure of the target reservoir of the gas well is obtained according to the pressure recovery well testing data of the production well.
4. The method for evaluating reservoir damage of a new production gas well according to claim 3, characterized in that if a plurality of production wells are arranged in the flow unit of the gas well, the original formation pressure of the target reservoir of each production well is obtained according to the pressure recovery well testing data of each production well, the original formation pressure of the target reservoir of each production well is averaged, and the average value is used as the original formation pressure of the target reservoir of the gas well.
5. The method for evaluating reservoir damage of a new producing gas well according to claim 1, 2 or 3, characterized in that the starting pressure gradient of the target reservoir is obtained by testing an actual core of the gas well or a core having the same physical property as the actual core of the gas well under the condition of the target reservoir.
6. A method for evaluating damage to a reservoir of a new producing gas well as described in claim 1, 2, or 3, wherein the bottom hole static pressure is obtained by measuring a pressure in a middle of a target reservoir.
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