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A water-controlled fracturing stimulation method for a water-gas layer at the bottom of a cuttings sandstone

A cutting sandstone and water fracturing technology, which is applied in the field of gas field fracturing development, can solve the problems of poor water control and production stimulation capability of bottom water gas layer, poor fracturing effect of bottom water gas layer, and high fracture extension, etc. To achieve the effect of improving the gas production capacity of the reservoir, improving the water control and stimulation capacity, and reducing the height extension of fractures

Active Publication Date: 2022-05-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, to provide a water-controlled fracturing stimulation method for the bottom water-air layer of cuttings sandstone, which overcomes 1 in the prior art: using chemical methods to fracturing the bottom water-air layer The improvement effect is not good. 2: The water control and production stimulation ability of the bottom water-gas layer using physical methods is poor, and the application prospect is not high. 3: The fracture height is easy to extend during the fracturing operation of the existing technology, causing the fracture height to extend to the bottom of the fracture. layers and other issues

Method used

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  • A water-controlled fracturing stimulation method for a water-gas layer at the bottom of a cuttings sandstone
  • A water-controlled fracturing stimulation method for a water-gas layer at the bottom of a cuttings sandstone
  • A water-controlled fracturing stimulation method for a water-gas layer at the bottom of a cuttings sandstone

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specific Embodiment approach

[0038] 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.

[0039] 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

[0042] The invention discloses a water-controlled fracturing stimulation method for a water-gas layer at the bottom of a cuttings sandstone, which comprises the following steps:

[0043] Step 1) Design and implement the fracturing stimulation parameters of the water-gas layer at the bottom of the well to be stimulated, wherein the fracturing stimulation parameters include proppant addition, construction displacement, average sand ratio and preflush ratio;

[0044] Step 2) Calculate the wellhead pressure when the cracks in the water and gas layer at the bottom of the well to be reformed are closed;

[0045] Step 3) Design the construction pump injection program, wherein the construction pump injection program includes low replacement construction, setting construction, front fluid construction, sand addition construction and displacement construction, and simultaneously design low replacement construction, setting construction, front fluid construction, Fracturing fluid and flu...

Embodiment 2

[0051] The invention discloses a water-controlled fracturing stimulation method for a water-gas layer at the bottom of a cuttings sandstone, which comprises the following steps:

[0052] Step 1) Design and implement the fracturing stimulation parameters of the water-gas layer at the bottom of the well to be stimulated, wherein the fracturing stimulation parameters include proppant addition, construction displacement, average sand ratio and preflush ratio;

[0053] Step 2) Calculate the wellhead pressure when the cracks in the water and gas layer at the bottom of the well to be reformed are closed;

[0054] Step 3) Design the construction pump injection program, wherein the construction pump injection program includes low replacement construction, setting construction, front fluid construction, sand addition construction and displacement construction, and simultaneously design low replacement construction, setting construction, front fluid construction, Fracturing fluid and flu...

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Abstract

The invention discloses a water-controlled fracturing method for increasing production of a water-gas layer at the bottom of a cuttings sandstone. The pre-fluid construction stage uses a water-controlled fracturing fluid to reduce the permeability of the water phase and reduce the water lock damage during the fracturing process. The gas phase permeability is not changed, and the combined sinking agent is used for slugging construction, while the perforation hole is formed, the combined sinking agent is sunk to form the lower artificial barrier, and the combination of the sinking agent can reduce the passage of formation water. The ability of fractures to flow into the wellbore improves the seepage capacity of the gas phase, allowing the gas to flow quickly and inhibiting the flow of formation water (as shown in Figure 1), so as to achieve the purpose of water control and gas production; during the sand adding construction stage, the construction displacement can be reduced through small construction displacement The fracture height is extended such that the fracture height does not extend into the aquifer section at the bottom of the fracture.

Description

technical field [0001] The invention belongs to the technical field of gas field fracturing development, and in particular relates to a water-controlled fracturing stimulation method for a water-gas layer at the bottom of a cuttings sandstone. Background technique [0002] In the development of tight gas sandstone, in order to improve the production capacity of gas wells, it is necessary to perform fracturing stimulation on some gas layers containing bottom water or water-bearing to produce production capacity. Excessively press open the aquifer, reduce the water production of the gas well, and improve the gas production capacity after the gas layer is reformed. [0003] At present, there are mainly two types of water-controlled fracturing methods for gas wells. One is chemical methods: changing the permeability of rocks by injecting chemicals to form an artificial fracture barrier on the rock surface that is impermeable to water and has good permeability to oil and gas. On...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/267
CPCE21B43/261E21B43/267
Inventor 牟春国李宪文张燕明古永红丁勇叶亮邝聃傅鹏韩巧荣朱李安
Owner PETROCHINA CO LTD