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High-leakage well drilling-plugging and sand washing liquid and using method and application thereof

A technology for lost well and sand washing fluid, which is applied in the application of plugging fluid or sand washing fluid. High loss well drilling plug sand washing fluid is used as the drilling plug fluid. In the field of high loss well drilling plug sand washing fluid, it can solve the problem of reducing formation Liquidity and other issues to achieve the effect of ensuring output and efficiency

Active Publication Date: 2021-01-15
克拉玛依新科澳石油天然气技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention provides a high-loss well drilling plug sand flushing fluid and its use and application, which overcomes the above-mentioned deficiencies in the prior art and can effectively solve the existing problems. The sand washing technology or plug drilling technology used in strong loss wells cannot effectively seal the strong loss formation. Even if the strong loss formation can be effective, it is very likely to reduce the fluidity of the formation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: this high loss well drilling plug sand flushing fluid comprises temporary plugging foam liquid one and temporary plugging foam liquid two, temporary plugging foam liquid one comprises 0.1% to 0.2% of hydroxypropyl distarch phosphate by weight percentage, Hydroxypropyl guar gum powder 0.1% to 0.4%, emulsifier 0P-10 0.05% to 0.1%, triethanolamine 0.05% to 0.1%, sodium hydroxide 0.01% to 0.05%, potassium chloride 1% to 2%, The balance is water; the temporary plugging foam solution two includes 0.1% to 0.5% of borax by weight percentage, 0.05% to 0.1% of sodium lignosulfonate, 0.01% to 0.05% of sodium carbonate, and 1% to 2% of potassium chloride. The balance is water.

[0025] The high loss well drilling plug sand flushing fluid of the present invention is suitable for high loss well conditions, and under such high loss well conditions, it can be used not only as a sand washing fluid for sand washing operations, but also as a drilling plug fluid for drilling ...

Embodiment 2

[0028] Embodiment 2: this high loss well drilling plug sand flushing fluid comprises temporary plugging foam liquid one and temporary plugging foam liquid two, temporary plugging foam liquid one comprises 0.1% or 0.2% of hydroxypropyl distarch phosphate by weight percentage, Hydroxypropyl guar gum powder 0.1% or 0.4%, emulsifier 0P-10 0.05% or 0.1%, triethanolamine 0.05% or 0.1%, sodium hydroxide 0.01% or 0.05%, potassium chloride 1% or 2%, Surplus is water; Temporary plugging foam liquid two comprises borax 0.1% or 0.5% by weight percentage, sodium lignosulfonate 0.05% or 0.1%, sodium carbonate 0.01% or 0.05%, potassium chloride 1% or 2%, The balance is water.

Embodiment 3

[0029] Embodiment 3: The use method of high loss well drilling plug flushing fluid as sand flushing fluid is carried out according to the following steps:

[0030] (1) Close the tubing valve on the wellhead, then inject temporary plugging foam liquid into the wellbore from the casing, and then inject isolation water;

[0031] (2) Inject temporary plugging foam liquid II from the casing to the wellbore, and then inject isolation water;

[0032] (3) Inject temporary plugging foam liquid from the casing to the wellbore until the pressure rises to 4MPa to 10MPa, then shut down the well for 20min to 40min;

[0033] (4) Down flushing pipe, inject temporary blocking foam liquid from the flushing pipe to flush the oil layer section, after the oil layer section is washed, replace the water with sand flushing fluid, and the sand washing operation is completed.

[0034] By injecting KRF-1 temporary plugging foam liquid (temporary plugging foam liquid 1) and KRF-2 temporary plugging foam...

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Abstract

The invention relates to the technical field of drilling-plugging liquid and sand washing liquid, in particular to high-leakage well drilling-plugging and sand washing liquid and a using method and application thereof. The high-leakage well drilling-plugging and sand washing liquid comprises first temporary plugging foam liquid and second temporary plugging foam liquid. The high-leakage well drilling-plugging and sand washing liquid can be used as sand washing liquid for sand washing operation and drilling-plugging liquid for drilling-plugging operation under the high-leakage well condition, in the using process, the high-leakage well drilling-plugging and sand washing liquid is polymerized in a leakage stratum to form a semi-solid polymer with certain strength, after sand washing operation or drilling-plugging operation construction is finished, the polymer is degraded and liquefied under the action of an inverse reaction of a polymerization reaction and stratum bacteria, thus polymerization plugging during drilling-plugging and sand washing is achieved, automatic liquefaction is achieved after construction, connectivity between the stratum and a wellbore is restored, and the yield and efficiency of subsequent oil and gas exploitation are guaranteed.

Description

technical field [0001] The invention relates to the technical field of drilling plug fluid and sand washing fluid, and relates to a high loss well drilling plug sand washing fluid, a method for using the high loss well drilling plug sand washing fluid as a sand washing fluid, and a high loss well drilling plug sand washing method. The method of using liquid as a plugging fluid also includes the application of high loss well drilling plug sand flushing fluid as high loss well drilling plug fluid or sand flushing fluid. Background technique [0002] In the process of oil and gas extraction, sand production often occurs inside the wellbore, especially in horizontal wells, which will affect the connectivity between the wellbore and the formation. At present, the commonly used method is to lower the flushing pipe to the sand outlet position in the wellbore, and take the formation sand out of the wellhead through water circulation sand washing. This method can solve the sand prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00E21B33/13C09K8/528C09K8/42
CPCE21B21/00E21B33/13C09K8/528C09K8/426
Inventor 苑新红邵宇黄士玮李代强张君余勇郇承武
Owner 克拉玛依新科澳石油天然气技术股份有限公司
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