Condensed sand carrying agent used for under-pressure oil gas well

A concentrated oil and gas well technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of formation pollution, poor sand-carrying ability, etc., and achieve small oil layer damage, large sand-carrying ratio, and good environmental protection Effect

Active Publication Date: 2013-11-06
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used to configure sand-carrying fluid for sand washing in remote oil and gas wells. It is fast, convenient, and low-cost. During construction, it can carry out sand washing under pressure and sand washing in under-pressure gas wells, and has no pollution to the downhole formation; it overcomes ordinary well washing The ability of liquid to carry sand is poor, and the problem of formation pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: Concentrated sand-carrying agent for underpressure oil and gas wells, the weight percentage of each component:

[0036] 1. Xanthan gum: 1%;

[0037] 2. High-efficiency foaming agent LF-Ⅱ (foaming agent): 20%;

[0038] 3. Potassium chloride (stabilizer): 0.5%;

[0039] 4. Sodium carbonate: 0.3%;

[0040] 5. High water loss plugging agent: 5%;

[0041] 6. Phenol: 0.5%;

[0042] 7. Epichlorohydrin (auxiliary stabilizer): 0.3%;

[0043] 8. Ethanol 0.6%;

[0044] 9. Carboxymethyl starch: 7%;

[0045] 10. Sodium bicarbonate: 0.5%;

[0046] 11. The rest is clear water (64.3%), and the sum of the percentages of each component is 100%.

[0047] Preparation of this example: at room temperature (25°C), use a small liquid dispensing device developed at the base to dispense liquid: 1m 3 Liquid reservoir, the base liquid (clear water) is stored in 1m 3 In the liquid storage tank, then add xanthan gum powder, viscosity stabilizer (potassium chloride), calcium c...

Embodiment 2

[0049] Embodiment 2: Concentrated sand-carrying agent for underpressure oil and gas wells, the weight percentage of each component:

[0050] 1. Xanthan gum: 1.2%;

[0051] 2. High-efficiency foaming agent LF-Ⅱ (foaming agent): 22%;

[0052] 3. Potassium chloride (stabilizer): 0.5%;

[0053] 4. Sodium carbonate: 0.3%;

[0054] 5. High water loss plugging agent: 5%;

[0055] 6. Phenol: 0.5%;

[0056] 7. Epichlorohydrin (auxiliary stabilizer): 0.3%;

[0057] 8. Ethanol 0.6%;

[0058] 9. Carboxymethyl starch: 5%;

[0059] 10. Sodium bicarbonate: 0.5%;

[0060] 11. The rest is clear water (64.1%), and the sum of the percentages of each component is 100%.

[0061] The preparation method is the same as in Example 1.

[0062] Example 2 Application Effect: Application in Well Se 3-26: The artificial well bottom of this well is 1533 meters, the formation pressure coefficient is 0.73, and the gas well is shut down due to sand-buried gas layers. Using the formula and production ...

Embodiment 3

[0063] Embodiment 3: Concentrated sand-carrying agent for underpressure oil and gas wells, the weight percentage of each component:

[0064] 1. Xanthan gum: 1.5%;

[0065] 2. High-efficiency foaming agent LF-Ⅱ (foaming agent): 21%;

[0066] 3. Potassium chloride (stabilizer): 0.9%;

[0067] 4. Sodium carbonate: 0.4%;

[0068] 5. High water loss plugging agent: 8%;

[0069] 6. Phenol: 0.9%;

[0070] 7. Epichlorohydrin (auxiliary stabilizer): 0.4%;

[0071] 8. Ethanol 0.5%;

[0072] 9. Carboxymethyl starch: 6%;

[0073] 10. Sodium bicarbonate: 0.6%;

[0074] 11. Water: 59.8%.

[0075] The preparation method is the same as in Example 1.

[0076] Example 3 Application Effect: Well Tai H5-1 Application: The well is a horizontal well with an artificial well bottom of 2731.12 meters and a formation pressure coefficient of 1.01. The gas well was shut down due to sand-buried gas layers. The formulation and production process of the concentrated sand-carrying agent used for un...

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Abstract

The invention discloses a condensed sand carrying agent used for an under-pressure oil gas well, and the condensed sand carrying agent is applied to the sand wash of the oil gas well in an oil gas field. The condensed sand carrying agent is characterized by comprising the following components in percentage by weight: 1-1.5% of xanthan gum, 20-25% of efficient foaming agent LF-II, 0.5-1% of potassium chloride, 0.2-0.5% of sodium carbonate, 5-8% of high-water-loss plugging agent, 0.5-1% of phenol, 0.3-0.5% of epoxy chloropropane, 0.5-0.8% of ethanol, 5-7% of carboxymethyl starch, 0.5-1% of sodium hydrogen carbonate and the rest of clear water, and the sum of the percentages of all the components is a hundred percent. The condensed sand carrying agent has the effects that the condensed sand carrying agent has favorable water solubility; when the concentration is lower, a water-soluble glue solution shows the characteristics of a plastic fluid; when the concentration is higher, a system shows the characteristics of a pseudoplastic fluid; the pollution to an underground stratum does not exist; the condensed sand carrying agent is applicable to the sand wash under a pressure and the work in an under-pressure gas well; and the problem that the seepage loss is big is solved. The solution dosage is only 50% of that of a conventional routine sand washing solution, and the pollution of a sand carrying solution to the stratum is reduced.

Description

technical field [0001] The invention relates to the technical field of oil and gas recovery in oil and gas fields, in particular to a chemical formulation for sand washing of underpressure oil and gas wells, which is a concentrated sand-carrying agent for underpressure oil and gas wells. Background technique [0002] Oil and gas well sand washing is an effective measure and necessary means to ensure the stable production of oil and gas wells. At present, in the sand washing construction of oil and gas wells in various oil fields, clean water or salt water circulation is often used to wash, sand wash, and kill the well. The sand carrying capacity in sand washing is poor, and the formation is also polluted to a certain extent during the operation, especially for underpressure oil and gas wells. Conventional sand washing has great damage to the reservoir, and the density of the conventional sand washing fluid system is high, which is prone to lost circulation, and even cannot e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/528
Inventor 鲁明春路彦森何强曾光军解海帮王忠文
Owner PETROCHINA CO LTD
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