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Water plugging turnaround fracture process suitable for water breakthrough oily gas well

A technology for old oil and gas wells, applied in the field of water plugging and diverting fracturing technology, can solve the problems of oil and gas well water breakthrough, serious fingering phenomenon, limited plugging effect, etc., to expand the scope of injection water, improve production efficiency and Benefits, productivity and recovery effects

Inactive Publication Date: 2019-08-27
SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As the development of major oil and gas fields in my country enters the middle and later stages, large-scale water injection is required to make up for the lack of formation energy. Due to formation heterogeneity and other reasons, water injection is uneven and fingering is serious, which leads to the increasing problem of water breakthrough in oil and gas wells, and even Severe conditions such as water flooding and water channeling lead to the shutdown of oil and gas wells, directly affecting the production and profitability of oil and gas fields
Moreover, due to the reduction of formation energy, formation pollution and clogging, the production of oil and gas wells has decreased. In order to meet the production requirements, major oil and gas fields need to adopt refracturing and other production stimulation measures. Because the conventional refracturing process is only on the basis of the original fractures Expansion and extension, as the number of fracturing increases, the fractures are very easy to extend to the water area, resulting in high water production or even complete water production in oil and gas wells, especially oil and gas wells near water injection wells, edge water, and bottom water. Measures Operations lead to a higher probability of water breakthrough; in addition, once water breakthrough occurs in oil and gas wells, the phenomenon of water injection fingering will rapidly intensify, resulting in the failure of other high oil-bearing areas to be swept by injected water, reducing the efficiency of water flooding and formation oil recovery
Aiming at the above-mentioned water breakthrough problem, the commonly used water plugging methods in oilfields include using chemical plugging agents, mechanical plugging of packers, or physical plugging of cement plugs to completely block the water outlet layer, but these methods have their own advantages and disadvantages. Disadvantages: the sealing effect of chemical methods is limited, and the sealing effect of mechanical and physical methods is good, but completely abandoning this layer will affect the overall production and recovery of the oil and gas field, and cannot achieve the effect of inducing or increasing production

Method used

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  • Water plugging turnaround fracture process suitable for water breakthrough oily gas well
  • Water plugging turnaround fracture process suitable for water breakthrough oily gas well
  • Water plugging turnaround fracture process suitable for water breakthrough oily gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A water shutoff diversion fracturing process suitable for water breakthrough old oil and gas wells, at least including the following steps:

[0031] Step 1) Use a cement truck to inject a sufficient amount of microemulsion ball particle plugging agent into the oil layer with low displacement;

[0032] Step 2) Inject the first high-viscosity liquid slug for displacing and pushing the microemulsion ball particle plugging agent deeply, wherein the viscosity of the first high-viscosity liquid slug is greater than 50mPa.s;

[0033] Step 3) Use a cement truck to inject cement slurry with specific properties, and solidify in the formation cracks to form cement plugs that isolate and block water;

[0034] Step 4) Use a pump truck to inject the second high-viscosity liquid slug to replace and push the cement slurry with specific performance to the predetermined position, wherein the viscosity of the second high-viscosity liquid slug is greater than 50mPa.s;

[0035] Step 5) Sta...

Embodiment 2

[0037] A water shutoff diversion fracturing process suitable for water breakthrough old oil and gas wells, at least including the following steps:

[0038] Step 1) Use a cement truck to inject a sufficient amount of microemulsion ball particle plugging agent into the oil layer with a low displacement; the low displacement is 0.5-1.0m 3 / min, the sufficient amount of microemulsion ball particle plugging agent is the dosage of 300m 3 or 300m 3 The above microemulsion ball particle blocking agent. The microemulsion ball particle blocking agent is a composite cross-linking blocking agent, with an initial particle size of 100 μm to 400 μm, uniformly dispersed in water;

[0039] Step 2) Inject the first high-viscosity liquid slug for displacing and pushing the microemulsion ball particle plugging agent deeply, wherein the viscosity of the first high-viscosity liquid slug is greater than 50mPa.s;

[0040] Step 3) Use a cement truck to inject cement slurry with specific performance...

Embodiment 3

[0046] Such as figure 2 As shown, a water shutoff diversion fracturing process suitable for water breakthrough old oil and gas wells, the specific implementation steps are as follows:

[0047] Step 1: Pre-construction preparations, including preparatory operations such as taking and running pipe strings, flushing wells, etc., and preparing microemulsion ball particle plugging agents, cement slurry, high-viscosity liquids, fracturing fluids, etc. according to construction requirements. agent;

[0048] The second step: use a cement truck to inject a sufficient amount of microemulsion ball particle plugging agent with a low displacement; the low displacement is 0.5-1.0m 3 / min, the sufficient amount of microemulsion ball particle plugging agent is the dosage of 300m 3 or 300m 3For the microemulsion ball particle blocking agent above, the microemulsion ball particle plugging agent is a composite cross-linking plugging agent with an initial particle size of 100 μm to 400 μm, an...

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Abstract

The invention relates to a water plugging turnaround fracture process suitable for a water breakthrough oily gas well. The process is characterized by at least comprising the following steps that firstly, a cementing truck is used for injecting the enough amount of microemulsion pellet particle plugging agent into an oil layer at the low displacement; secondly, injection of a first-segment hyperviscous liquid segment plug is carried out for replacing and pushing of penetrating of the microemulsion pellet particle plugging agent, and the viscosity of the first-segment hyperviscous liquid segment plug is larger than 50 mPa.s; thirdly, the cementing truck is used for injecting specific-property cement paste, curing is carried out in a formation fracture to form an isolation water plugging cement plug; fourthly, a pump truck is used for injection for a second-segment hyperviscous liquid segment plug so as to be used for replacing and pushing the specific-property cement paste to the reserved position, and the viscosity of the second-segment hyperviscous liquid segment plug is larger than 50 mPa.s; and fifthly, pump starting is carried out, a multi-dimensional pipe is used for fracturing, and in-seam seam making turnaround fracture construction is implemented. Effective water plugging of the deep part of the stratum is achieved, the production increasing and effect increasing effects are achieved, and injection water wave and frequency and oil recovery ratio can be improved.

Description

technical field [0001] The invention relates to the technical field of production and development of oil and gas fields, in particular to a water shutoff and diversion fracturing process suitable for water breakthrough old oil and gas wells. Background technique [0002] As the development of major oil and gas fields in my country enters the middle and later stages, large-scale water injection is required to make up for the lack of formation energy. Due to formation heterogeneity and other reasons, water injection is uneven and fingering is serious, which leads to the increasing problem of water breakthrough in oil and gas wells, and even Severe conditions such as water flooding and water channeling lead to the shutdown of oil and gas wells, which directly affects the output and benefits of oil and gas fields. Moreover, due to the reduction of formation energy, formation pollution and clogging, the production of oil and gas wells has decreased. In order to meet the production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26C04B28/04
CPCC04B28/04E21B43/261C04B2103/22
Inventor 任雁鹏肖良飞韩金井
Owner SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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