Tight gas reservoir multi-layer development gas well layering yield contribution evaluation method

An evaluation method and technology of tight gas, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of poor efficiency, large individual differences, high cost, etc., and achieve strong feasibility, small workload, and accuracy high rate effect

Pending Publication Date: 2021-01-26
PETROCHINA CO LTD
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Problems solved by technology

[0003] CN110685651A patent discloses a method based on annual production profile test data and logging interpretation parameters, establishing a comprehensive relationship between the annual layered production contribution rate of gas reservoir components and logging interpretation parameters to calculate layered production contribution. It requires a large number of gas wells to participate in continuous multi-year production profile tests to conclude the rules. It is feasible to use this method for conventional gas reservoirs, but for tight sandstone gas reservoirs with poor benefits and low-cost development strategies, multiple wells participate in the test. , and testing for many years, it is not feasible in terms of workload, testing cost and time cost
However, tight sandstone gas reservoirs are dense and heterogeneous, and the temperature and pressure of the original formation are different, and more than 90% of the wells have water production, which has a huge impact on pressure, and this method has no effect on existing production pipes. Columns have certain requirements, so this method is not universal in some gas fields and tight sandstone gas reservoirs
[0005] There is no basis for the splitting of the existing production stratification contribution, only relying on experience stratification, individual differences are large, and various stratification tests such as on-site production profile tests are heavy in workload, long in cycle and high in cost. A more effective and accurate method for stratum yield evaluation

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  • Tight gas reservoir multi-layer development gas well layering yield contribution evaluation method
  • Tight gas reservoir multi-layer development gas well layering yield contribution evaluation method
  • Tight gas reservoir multi-layer development gas well layering yield contribution evaluation method

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specific Embodiment approach

[0074] It should be noted that the structures, proportions, sizes, etc. shown in this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present invention. Any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope covered by the technical contents disclosed in the present invention without affecting the functions and objectives of the present invention.

[0075] At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any su...

Embodiment 1

[0077] The invention discloses a method for evaluating the layered production contribution of gas wells in multilayer development of tight gas reservoirs, which comprises the following steps:

[0078] Step 1) predict the final cumulative production of the gas well to be tested;

[0079] Step 2) Predict the bottom hole flowing pressure of the gas well to be measured, and compare it with the original formation pressure to obtain the pressure drop;

[0080] Step 3) Establishing a diagram of the relationship between pressure drop and discharge radius of different reservoir types in the block to which the gas well to be tested belongs;

[0081] Step 4) Determine the reservoir type of each sublayer of the gas well to be tested, and determine the drainage of each sublayer of the gas well to be tested according to the pressure drop in step 2) and the relationship between pressure drop and drainage radius of different reservoir types in step 3) Radius, determine the leakage area of ​​...

Embodiment 2

[0085] Preferably, predicting the final cumulative production of the gas well to be tested in the step 1) is to use the production depletion method to predict the final cumulative production of the gas well to be tested, and first draw the actual production and cumulative production (actual cumulative production) of the gas well to be tested Then, the relationship between the production of gas wells at any time or the final cumulative production of gas wells and the initial production of gas wells is obtained by fitting, and then the abandoned production is given to obtain the time corresponding to the abandoned production, and the final cumulative production corresponding to the time corresponding to the abandoned production is The final cumulative production of gas logging wells (predicted cumulative production).

[0086] The final cumulative production prediction of gas wells is divided into two steps. One is to apply the production q at any time in Equation 1 g and gas wel...

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Abstract

The invention discloses a tight gas reservoir multi-layer development gas well layering yield contribution evaluation method. The method comprises the following steps that 1, the final cumulative yield of a to-be-measured gas well is predicted; 2, the bottomhole flowing pressure of the to-be-measured gas well is predicted, and the bottomhole flowing pressure is compared with an original formationpressure to obtain pressure drop; 3, a pressure drop and discharge radius relation chart of different reservoir types of the block to which the to-be-measured gas well belongs is established; 4, the reservoir type of each small layer of the to-be-measured gas well is determined, the discharge radius of each small layer of the to-be-measured gas well is determined according to the pressure drop inthe step 2 and the pressure drop and discharge radius relation chart of different reservoir types in the step 3, and the discharge area of each small layer of the to-be-measured gas well is determinedaccording to the discharge radius; 5, a yield contribution index of each small layer of the to-be-measured gas well is determined according to the discharge area of each small layer of the to-be-measured gas well in the step 4; and 6, the layered daily output and the layered final accumulated output of each small layer of the to-be-detected gas well is determined, and layered output contributionevaluation is performed on the to-be-detected gas well.

Description

technical field [0001] The invention belongs to the technical field of natural gas development, and in particular relates to a method for evaluating the production contribution of gas well layers in multilayer development of tight gas reservoirs. Background technique [0002] Tight gas reservoirs have entered the middle and late stages of stable production, and tapping the potential of remaining reserves is an important means to prolong the stable production period of gas fields. For multi-layer development gas wells, finding out the producing reserves of each development layer is the basis for evaluating the remaining reserves. [0003] CN110685651A patent discloses a method based on annual production profile test data and logging interpretation parameters, establishing a comprehensive relationship between the annual layered production contribution rate of gas reservoir components and logging interpretation parameters to calculate layered production contribution. It requir...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B43/14G06Q50/02
CPCE21B49/00E21B43/14G06Q50/02Y02A10/40
Inventor 王继平李进步李娅李小锋于占海刘平付斌白玉奇
Owner PETROCHINA CO LTD
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