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Fire-flooding well self-degradable temporary plugging agent and preparation method and application thereof

A technology of self-degradation and temporary plugging agent, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in plugging, reservoir damage, and decrease in formation permeability, and achieve a wide range of particle size distribution, The effect of releasing oil production capacity and reducing formation water production

Active Publication Date: 2019-02-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During fire flooding workover, affected by fire flooding effect, block plane connection is complicated, gas channeling interference is serious, wellbore pressure cannot be fully released, and construction preparation time is increased by more than 5 days on average compared with ordinary wells, which seriously affects workover efficiency and production time rate
The methods used in the past are to kill the well with brine and use powder temporary plugging agent, but both have certain technical limitations
Specifically, due to the low pressure coefficient of the formation and the serious loss of the killing fluid when using brine to kill the well, the formation cannot be balanced, and the injection of too much killing fluid will cause pollution to the formation
Although the use of powder temporary plugging agent to kill the well has a good plugging effect, there is a phenomenon of pump stuck after the well is opened in the lower pump well and the pump inspection well in the fire flooding area
[0003] In response to this series of problems, shielding temporary plugging agents and temporary plugging technologies have been developed at home and abroad in recent years, which mainly use water-soluble polymer jelly, acid-soluble particles, and polymer materials to shield and temporarily plug the perforated section of the borehole wall Afterwards, check the pump or check the string and other operations, so as to avoid the safety risk and operating cost increase caused by the pressurized operation, but there are still the following problems: First, the water-soluble polymer jelly-type plugging agent often preferentially enters the oil-free Even if a small amount of pores enter the oil-bearing pores, it is difficult to unplug them by themselves, resulting in a decrease in formation permeability, and cannot effectively seal blastholes and near-wellbore formations
Second, the acid-soluble temporary plugging agent is mainly CaCO 3 For such products, acid solution needs to be used to remove plugs after the operation, and the injection of acid solution will not only cause damage to the reservoir, but also increase the operating procedures and construction costs
The third is that polymer temporary plugging agent materials are widely used, and the temporary plugging effect is good, but it is difficult to remove the plugging agent, which will cause great damage to low-porosity and low-permeability oil fields

Method used

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  • Fire-flooding well self-degradable temporary plugging agent and preparation method and application thereof
  • Fire-flooding well self-degradable temporary plugging agent and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0056] This embodiment provides a self-degradable temporary plugging agent for fire flooding wells. Based on the total weight of the self-degradable temporary plugging agent for fire flooding wells as 100%, the raw materials for preparing the self-degradable temporary plugging agent for fire flooding wells include:

[0057] Industrial grade super guar gum 0.3%;

[0058] Borax 0.01%;

[0059] Alkyd resin (particle size 0.1mm) 0.5%;

[0060] Polyvinyl alcohol fiber (fiber length is 3mm, fiber tensile strength is 20MPa, fiber diameter is 10μm) 0.2%;

[0061] 2-acrylamido-2 methylpropanesulfonic acid 0.02%;

[0062] Formaldehyde 0.1%;

[0063] Polyoxyethyl alkyl phenyl ether 0.2%;

[0064] Low-viscosity sodium carboxymethylcellulose and hydrolyzed polyacrylonitrile ammonium salt are mixed in a mass ratio of 1:1 to obtain a mixed solution of 1%;

[0065] Dr. Enzyme Dr.Nzyme200 (galactomannanase) 0.001%;

[0066] And oilfield sewage with a balance of 40°C.

[0067] The specif...

Embodiment 2

[0080] This embodiment provides a self-degradable temporary plugging agent for fire flooding wells. Based on the total weight of the self-degradable temporary plugging agent for fire flooding wells as 100%, the raw materials for preparing the self-degradable temporary plugging agent for fire flooding wells include:

[0081] Hydroxypropyl guar gum 0.8%;

[0082] Borax 0.05%;

[0083] Acrylic resin (particle size is 2mm) 2%;

[0084] Modified polyester fiber (fiber length is 15mm, fiber tensile strength is 800MPa, fiber diameter is 100μm) 0.6%;

[0085] Sodium thiosulfate 0.1%;

[0086] Herotropine 0.5%;

[0087] Polyoxyethyl alkyl ether 0.6%;

[0088] Low viscosity sodium carboxymethyl cellulose and hydrolyzed polyacrylonitrile ammonium salt are mixed in a mass ratio of 1:1 to obtain a mixed solution of 3%;

[0089] Dr. Enzyme Dr.Nzyme200 (galactomannanase) 0.004%;

[0090] And the balance is 40 ℃ oilfield sewage.

[0091] The specific preparation process of the fire flo...

Embodiment 3

[0100] This embodiment provides a self-degradable temporary plugging agent for fire flooding wells. Based on the total weight of the self-degradable temporary plugging agent for fire flooding wells as 100%, the raw materials for preparing the self-degradable temporary plugging agent for fire flooding wells include:

[0101] Hydroxypropyl guar gum 0.6%;

[0102] Organic boron 0.03%;

[0103] This organoboron used in the present embodiment utilizes borate (Na 2 B 4 o 7 ) and organic ligands (LGD(OH) 6 ) a stable organic complex formed under the action of chemical auxiliary agents;

[0104] Synthetic fatty acid resin (particle size 1mm) 1%;

[0105] Polyurethane fiber (fiber length is 10mm, fiber tensile strength is 500MPa, fiber diameter is 50μm) 0.3%;

[0106] Sodium thiosulfate 0.05%;

[0107] Herotropine 0.25%;

[0108] Polyoxyethyl fatty acid ether ester 0.3%;

[0109] Low viscosity sodium carboxymethylcellulose and hydrolyzed polyacrylonitrile ammonium salt are mix...

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Abstract

The invention provides a fire-flooding well self-degradable temporary plugging agent and a preparation method and an application thereof. By metering the total weight of the self-degradable temporaryplugging agent is 100%, the raw materials for preparing the self-degradable temporary plugging agent include: 0.3-0.8% of a main agent; 0.01-0.05% of a cross-linking agent; 0.5-2% of oil-solubility resin; 0.2-0.6% of fiber particles; 0.02-0.1% of a heat stabilizer; 0.1-0.5% of a fungicide; 0.2-0.6% of a cleanup additive; 1-3% of a fluid loss reducer; 0.001-0.004% of a slow release gel breaker, andthe balance of water. The fire-flooding well self-degradable temporary plugging agent has the characteristics of good pumping property, temperature resistance, simple preparation, and low cost, and the gel breaking time is adjustable, the sealing ability is strong, and the self-degradable temporary plugging agent is suitable for wide oil reservoir types, and is not easy to pollute the stratum andcan enter a deep part of the stratum, which can effectively solve the production problem of large gas production amount of the fire-flooding wells.

Description

technical field [0001] The invention relates to a fire flooding well self-degradation temporary plugging agent and its preparation method and application, belonging to the technical field of oilfield development. Background technique [0002] During fire flooding workover, affected by fire flooding effect, block plane connection is complicated, gas channeling interference is serious, wellbore pressure cannot be fully released, and construction preparation time is increased by more than 5 days on average compared with ordinary wells, which seriously affects workover efficiency and production time rate . The methods used in the past are to kill the well with brine and use powder temporary plugging agent, but both have certain technical limitations. Specifically, due to the low formation pressure coefficient and serious loss of well killing fluid in brine to kill the well, the formation cannot be balanced, and the injection of too much killing fluid will cause pollution to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/5083C09K8/5086C09K8/514C09K2208/08C09K2208/18C09K2208/24
Inventor 陈小凯李瑞张守军滕立勇曾双红王浩吴非刘强匡旭光王尧马昌明杨东升周明升李邵泽李俊萍管紫君
Owner PETROCHINA CO LTD
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