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Method for pretreating rock debris treated through quick lime before reinjection through exhausted well

A quicklime and pretreatment technology, which is applied in chemical instruments and methods, earthwork drilling, and flushing wellbore, etc., can solve the problem of divalent calcium ions affecting the performance of re-injection, poor stability of re-injection, and easy blockage of re-injection. Inject channel and other problems to achieve good suspension stability, eliminate adverse effects, and good static shear force

Pending Publication Date: 2020-06-19
四川西南油大石油工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: to provide a pretreatment method for cuttings treated with quicklime before reinjection in depleted wells, which solves the problem of poor grouting stability, easy settlement, poor anti-penetration performance, and easy Blockage of reinjection channels and divalent calcium ions have adverse effects on the performance of reinjection grout

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0055]This embodiment discloses the pretreatment method of the present invention for cuttings treated with quicklime before reinjection in a depleted well, specifically:

[0056] Grind the rock cuttings treated with quicklime into 150-180μm fine powder, and then prepare grouting according to the following mass-volume ratio relative to the volume of grouting water:

[0057] 1. Xanthan gum 1%;

[0058] 2. Low viscosity carboxymethyl cellulose 0.5%;

[0059] 3. Cuttings after lime treatment 10%;

[0060] 4. Sodium hydroxide 3%

[0061] In this embodiment, when the volume of slurry preparation water is mL, the mass of rock cuttings treated with xanthan gum, low-viscosity carboxymethyl cellulose, sodium hydroxide and quicklime is g.

[0062] The specific preparation method of re-injection is: first add slurry mixing water into the slurry mixing container, then add xanthan gum, sodium hydroxide, quicklime treated rock cuttings in proportion, and finally add low-viscosity carboxym...

Embodiment 2

[0070] This embodiment discloses the pretreatment method of the present invention for cuttings treated with quicklime before reinjection in a depleted well, specifically:

[0071] Grind the rock cuttings treated with quicklime into 150-180μm fine powder, and then prepare grouting according to the following mass-volume ratio relative to the volume of grouting water:

[0072] 1. Xanthan gum 1%;

[0073] 2. Low viscosity carboxymethyl cellulose 3%;

[0074] 3. Cuttings after lime treatment 10%;

[0075] 4. Sodium hydroxide 3%

[0076] In this embodiment, when the volume of slurry preparation water is mL, the mass of rock cuttings treated with xanthan gum, low-viscosity carboxymethyl cellulose, sodium hydroxide and quicklime is g.

[0077] The specific preparation method of re-injection is: first add slurry mixing water into the slurry mixing container, then add xanthan gum, sodium hydroxide, quicklime treated rock cuttings in proportion, and finally add low-viscosity carboxyme...

Embodiment 3

[0085] This embodiment discloses the pretreatment method of the present invention for cuttings treated with quicklime before reinjection in a depleted well, specifically:

[0086] Grind the rock cuttings treated with quicklime into 150-180μm fine powder, and then prepare grouting according to the following mass-volume ratio relative to the volume of grouting water:

[0087] 1. High viscosity carboxymethyl cellulose 1%;

[0088] 2. Low viscosity carboxymethyl cellulose 0.5%;

[0089] 3. Cuttings after lime treatment 10%;

[0090] 4. Sodium carbonate 3%

[0091] In this embodiment, when the volume of slurry preparation water is mL, the mass of cuttings after treatment with high-viscosity carboxymethyl cellulose, low-viscosity carboxymethyl cellulose, sodium carbonate and quicklime is g.

[0092] The specific preparation method of back grouting is as follows: first add slurry mixing water into the slurry mixing container, then add high viscosity carboxymethyl cellulose, sodium...

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Abstract

The invention discloses a method for pretreating rock debris treated through quick lime before reinjection through an exhausted well. The problems that in the prior art, reinjection slurry is poor instability, prone to settling, poor in anti-penetration performance and prone to blocking a reinjection channel, and divalent calcium ions have a bad influence on the performance of the reinjection slurry are solved. The method for pretreating the rock debris treated through the quick lime before reinjection through the exhausted well comprises the steps that the rock debris treated through the quick lime is ground into fine powder with the particle size being smaller than or equal to 300 [mu]m, and then evenly mixed with slurry preparing water, a suspending agent, a filtrate reducer and a calcium remover to prepare reinjection slurry. The method is scientific in design and easy to operate, the reinjection slurry is good in stability and not prone to settling and does not block the reinjection channel, and the bad influence of the divalent calcium ions on the performance of the reinjection slurry is eliminated.

Description

technical field [0001] The invention belongs to the field of petroleum drilling waste treatment, and is especially aimed at cuttings treated with quicklime produced when shale gas wells and horizontal wells use oil-based drilling fluid for drilling operations, and treated with quicklime after quicklime breaking and drying. The final cuttings are pretreated before reinjection in depleted wells. Background technique [0002] At present, the cuttings disposal technology after quicklime treatment usually adopts solidification, drying, physical separation, incineration, pyrolysis and biological technology. Each of the above methods has certain limitations. However, the depleted well is used as the storage space for the cuttings treated with quicklime, and the cuttings treated with quicklime are transported and stored in a centralized manner, ground and crushed, and then mixed with water or sewage to make re-injection, and then injected into the underground through the re-injecti...

Claims

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Application Information

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IPC IPC(8): E21B21/06C09K8/03
CPCC09K8/03E21B21/068
Inventor 操亮周翰操盛章
Owner 四川西南油大石油工程有限公司