Tube condensation prevention inhibitor as well as preparation method, use method and application thereof

Abstract

The invention belongs to the technical field of drilling and completion of heavy oil wells, and particularly relates to an anti-condensation pipe inhibitor as well as a preparation method, a use method and application thereof. The anti-condensation pipe inhibitor provided by the invention comprises the following components in percentage by weight: 80%-100% of a penetrant and 0-20% of a solubilizer. The anti-condensation pipe inhibitor disclosed by the invention has the advantages of simple components, convenience in preparation, rapidness, high efficiency, low cost, strong pertinence, no influence on the performance of drilling fluid and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of heavy oil well drilling and completion, and particularly relates to an anti-coagulation tube inhibitor and a preparation method, a use method and an application thereof. Background Art

[0002] In the process of heavy oil drilling, in order to stabilize the asphalt layer, the equivalent density of the drilling fluid must be greater than the formation pressure coefficient. Since there are well-connected pores and cracks on the well wall and cracks and caves deep in the formation, the high-density drilling fluid flows into the formation along the lower part of the cracks, displacing the low-density asphalt from the formation to the wellbore. Due to the density difference between asphalt and drilling fluid, this asphalt invasion caused by gravity displacement is almost unavoidable during the drilling process, especially under static conditions such as single-root connection and tripping. A large amount of asphalt invading the wellbore not only greatly destroys the performance of the drilling fluid, but also adheres to the drill bit, the inner wall of the casing, the vibrating screen, etc., causing the pump pressure and torque to rise, and the vibrating screen to run, which brings great difficulties to the drilling operation. At the same time, due to the invasion of asphalt into the wellbore, the wellbore pressure gradient is reduced. If the formation pressure is greater than the wellbore pressure, more asphalt will invade the wellbore under the action of the pressure difference, causing more serious overflow, wellhead pressure and other problems, making the drilling operation impossible.

[0003] Some oil fields are ultra-deep, ultra-thick carbonate reservoirs with high coagulation, high viscosity and heavy properties. During the drilling of ultra-thick oil wells, ultra-thick oil often invades the drilling fluid and causes the problem of condensation pipe. The main reason is that during the return process of the heavy oil, the viscosity increases, the fluidity becomes poor or even does not flow, and the condensation pipe is attached to the inner wall of the drill pipe and casing (see Figure 3 ). This problem not only brings potential safety hazards to on-site drilling operations, but also greatly increases the cost of drilling operations. Therefore, preventing the occurrence of condensation tubes during drilling is an important issue that needs to be solved urgently. Summary of the invention

[0004] In view of the defects of the prior art, an anti-coagulation tube inhibitor and a preparation method, a use method and an application thereof are provided.

[0005] Specifically, the anticoagulation tube inhibitor provided by the present invention comprises, by weight percentage, 80% to 100% of a penetrant and 0% to 20% of a solubilizing agent.

[0006] The anticoagulation tube inhibitor mentioned above comprises, by weight percentage, 85% to 95% of a penetrant and 5% to 15% of a solubilizing agent.

[0007] The above-mentioned anti-condensation tube inhibitor, the penetrant includes one or more of diesel, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol ether, methyl oleate, xylene, solvent oil No. 21, solvent oil No. 120, solvent oil No. 61, solvent oil D80, solvent oil D100, solvent oil No. 120, solvent oil No. 150, solvent oil No. 200, and white oil.

[0008] The above-mentioned anti-condensation tube inhibitor, the penetrant is one of diesel, ethylene glycol monobutyl ether, methyl oleate, xylene, solvent oil No. 120, solvent oil No. 150, solvent oil No. 200, white oil, or a mixture of several of them.

[0009] The solubilizing agent of the anticoagulation tube inhibitor mentioned above includes one or more of sodium fatty alcohol polyoxyethylene ether carboxylate, lauryl amide propyl hydroxysulfobetaine, cocoamidopropyl betaine, sodium alkylphenol polyoxyethylene ether carboxylate, and coconut oil fatty acid diethanolamide.

[0010] In the above-mentioned anticoagulation tube inhibitor, the solubilizing agent is one or a mixture of fatty alcohol polyoxyethylene ether carboxylate sodium, lauramide propyl hydroxysulfobetaine, alkylphenol polyoxyethylene ether carboxylate sodium.

[0011] On the other hand, the present invention also provides a method for preparing the above-mentioned anti-coagulation tube inhibitor, comprising: uniformly mixing the penetrant and the solubilizer according to a ratio to obtain the anti-coagulation tube inhibitor.

[0012] In another aspect, the present invention also provides the use of the above-mentioned anti-condensation pipe inhibitor in inhibiting heavy oil from invading the drilling fluid condensation pipe.

[0013] On the other hand, the present invention also provides a method for using the above-mentioned anti-freeze pipe inhibitor, comprising: when heavy oil invasion of drilling fluid occurs or before drilling into a reservoir where heavy oil invasion may occur, the anti-freeze pipe inhibitor is directly added into the mud pool and mixed with the drilling fluid, and then returned to the ground from the annulus after contacting and mixing with the heavy oil invading the drilling fluid at the drilled layer.

[0014] The above-mentioned method of use is characterized in that the concentration of the anti-coagulation tube inhibitor in the drilling fluid is 0.5% to 15%.

[0015] The technical solution of the present invention has the following beneficial effects:

[0016] (1) The anti-coagulation tube inhibitor of the present invention has the advantages of simple components, convenient preparation, rapid and efficient, low cost, strong pertinence, and no effect on the performance of drilling fluid;

[0017] (2) The anti-condensation pipe inhibitor of the present invention can eliminate the risk of condensation pipe caused by the change of rheological properties of drilling fluid due to heavy oil invasion during the ultra-heavy oil drilling process, thereby ensuring the smooth development of ultra-heavy oil field drilling work;

[0018] (3) The method for using the anti-condensation pipe inhibitor of the present invention can be injected into the casing space during the well completion process to clean the residual super-heavy oil in the annulus, thereby providing technical guarantee for the smooth completion of the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0020] Figure 1 This is a real photo of the anti-coagulation tube inhibitor of the present invention;

[0021] Figure 2 Schematic diagram of the process of filling the anticoagulation tube inhibitor;

[0022] Figure 3 This is a photo of the thick oil returned before adding the anti-coagulation tube inhibitor;

[0023] Figure 4 This is a photo of the thick oil returned after adding anti-coagulation inhibitor. DETAILED DESCRIPTION

[0024] In order to fully understand the purpose, features and effects of the present invention, the present invention is described in detail through the following specific embodiments. Except for the following contents, the process method of the present invention adopts conventional methods or devices in the art. Unless otherwise specified, the following terms have the meanings commonly understood by those skilled in the art.

[0025] When a numerical range is disclosed herein, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges can be combined. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all subranges included therein.

[0026] First, as Figure 1 As shown, the present invention provides an anti-coagulation tube inhibitor, comprising: a permeating agent and a solubilizing agent.

[0027] The penetrant can form strong hydrogen bonds with the asphaltene molecules in the heavy oil, penetrate into the lamellar structure of the colloidal asphaltene molecules, thereby dispersing the colloidal asphaltene macromolecular aggregates and reducing the viscosity of the heavy oil. The solubilizer can form an oil-in-water emulsion between the heavy oil after the penetrant viscosity reduction and the drilling fluid, further reducing the viscosity of the heavy oil.

[0028] The components of the anticoagulation tube inhibitor of the present invention are described in detail below:

[0029] Penetrant

[0030] The penetrant can form strong hydrogen bonds with the asphaltene molecules in the heavy oil and penetrate into the lamellar structure of the colloid asphaltene molecules, thereby dispersing the macromolecular aggregates of the colloid asphaltene and reducing the viscosity of the heavy oil.

[0031] In some preferred embodiments, the penetrant includes one or more of diesel, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol ether, methyl oleate, xylene, solvent oil No. 21, solvent oil No. 61, solvent oil D80, solvent oil D100, solvent oil No. 120, solvent oil No. 150, solvent oil No. 200, and white oil.

[0032] Further preferably, the penetrant is one or a mixture of diesel, ethylene glycol monobutyl ether, methyl oleate, xylene, solvent oil No. 120, solvent oil No. 150, solvent oil No. 200, and white oil.

[0033] In some preferred embodiments, the weight percentage of the penetrant in the anticoagulation tube inhibitor is 80% to 100%.

[0034] In practice, when the ratio of penetrant to anti-condensation pipe inhibitor is too small, it cannot effectively reduce the viscosity of heavy oil, thus leading to the occurrence of condensation pipe problems.

[0035] More preferably, the weight percentage of the penetrant in the anticoagulation tube inhibitor is 85% to 95%.

[0036] Solubilizer

[0037] The solubilizer can form an oil-in-water emulsion between the heavy oil after the viscosity reduction by the penetrant and the drilling fluid, further reducing the viscosity of the heavy oil.

[0038] In some preferred embodiments, the solubilizer includes one or more of sodium fatty alcohol polyoxyethylene ether carboxylate, lauryl amide propyl hydroxysulfonyl betaine, cocamidopropyl betaine, sodium alkylphenol polyoxyethylene ether carboxylate, and coconut oil fatty acid diethanolamide.

[0039] Further preferably, the solubilizer is one or a mixture of fatty alcohol polyoxyethylene ether carboxylate sodium, lauramide propyl hydroxysulfobetaine, and alkylphenol polyoxyethylene ether carboxylate sodium.

[0040] In some preferred embodiments, the weight percentage of the solubilizing agent in the anticoagulation tube inhibitor is 0% to 20%.

[0041] In practice, when the ratio of solubilizer to anti-condensation tube inhibitor is too large, the viscosity of heavy oil cannot be effectively reduced, thus leading to the occurrence of condensation tube problems.

[0042] More preferably, the weight percentage of the solubilizer in the anticoagulation tube inhibitor is 5% to 15%.

[0043] The anti-condensation pipe inhibitor of the present invention can eliminate the risk of condensation pipe caused by the rheological change of drilling fluid due to heavy oil invasion during the ultra-heavy oil drilling process, thereby ensuring the smooth development of ultra-heavy oil field drilling work.

[0044] In a second aspect, the present invention further provides a method for preparing the above-mentioned anti-coagulation tube inhibitor, comprising: uniformly mixing the penetrant and the solubilizer according to a ratio to obtain the anti-coagulation tube inhibitor.

[0045] The anticoagulation tube inhibitor of the present invention has the advantages of simple components and convenient preparation.

[0046] In a third aspect, the present invention also provides the use of the above-mentioned anti-condensation pipe inhibitor in inhibiting heavy oil from invading the drilling fluid condensation pipe.

[0047] Fourthly, Figure 2 As shown, the present invention also provides a method for using the above-mentioned anti-condensation pipe inhibitor, comprising: when drilling fluid heavy oil invasion occurs or before drilling into a reservoir where heavy oil invasion may occur, directly adding the anti-condensation pipe inhibitor at a concentration of 0.5-15wt% into a mud pool and mixing with the drilling fluid, and then returning the anti-condensation pipe inhibitor to the surface from the annulus after the anti-condensation pipe inhibitor reaches the drilling layer and contacts with the heavy oil invading the drilling fluid and mixes with the heavy oil invading the drilling fluid.

[0048] In this process, the inhibitor can disperse the heavy oil invading the drilling fluid well in the drilling fluid to avoid the occurrence of condensate pipe. After drilling is completed, the inhibitor can be added to the drilling fluid. The drilling fluid containing the inhibitor is lowered into the depth of the completed well through the drill pipe and returned to the ground through the annulus space, bringing the remaining heavy oil in the well to the ground to avoid the occurrence of condensate pipe. When the drilling fluid heavy oil invasion occurs or before drilling into a reservoir where heavy oil invasion may occur or after drilling is completed, the penetrant and the solubilizer can be added to the drilling fluid respectively, and the heavy oil invading the drilling fluid is mixed with the drilling layer and then returned to the ground from the annulus. The effect of inhibiting the invasion of heavy oil into the drilling fluid condensate pipe is achieved, providing technical guarantee for smooth completion of the well.

[0049] Example

[0050] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions. The sources and models of the raw materials used in the following examples are as follows:

[0051] Diesel: Dongguan Lite-On Energy Co., Ltd., brand: Lite-On Energy, model: No. 0 diesel;

[0052] Ethylene glycol monoethyl ether: Jinan Qihang Chemical Technology Co., Ltd., brand: Tianyin, effective content: 99%;

[0053] Ethylene glycol monobutyl ether: Jinan Xinke Chemical Co., Ltd., brand: Tianyin, effective content: 99%;

[0054] Sodium fatty alcohol polyoxyethylene ether carboxylate: Yixing Jiateng Chemical Co., Ltd., brand: Jiateng Chemical, product model: AEC-9Na-99, effective content: 99%;

[0055] Sodium alkylphenol polyoxyethylene ether carboxylate: Hubei Kemaidi Chemical Co., Ltd., brand: Kemaidi, product model: APEC-Na-98, effective content: 98%;

[0056] Solvent oil No. 120: Jinan Hongtai Chemical, brand: Hongtai Chemical, product grade: industrial grade;

[0057] Cocamidopropyl betaine: Jinan Daorong Chemical Co., Ltd., product model: CAB-35, effective content: 99%;

[0058] Solvent oil No. 150: Shandong Xuxiang Chemical Co., Ltd., product grade: industrial grade.

[0059] Example 1

[0060] Weigh 80 g of diesel, 5 g of ethylene glycol monoethyl ether, and 5 g of ethylene glycol monobutyl ether, put them in a 250 mL beaker, stir at 250 rpm for 10 min, then put the beaker in a 60 ° C water bath, add 5 g of sodium fatty alcohol polyoxyethylene ether carboxylate and 5 g of sodium alkylphenol polyoxyethylene ether carboxylate to the beaker, and stir at 250 rpm for 30 min to prepare an anti-condensation tube inhibitor.

[0061] Example 2

[0062] Weigh 80 g of No. 120 heavy aromatic hydrocarbons and 10 g of ethylene glycol monobutyl ether, put them in a 250 mL beaker, stir at 250 rpm for 10 min, then place the beaker in a 60 ° C water bath, add 5 g of sodium fatty alcohol polyoxyethylene ether carboxylate and 5 g of sodium alkylphenol polyoxyethylene ether carboxylate to the beaker, and stir at 250 rpm for 30 min to prepare an anti-coagulation tube inhibitor.

[0063] Example 3

[0064] Weigh 90 g of No. 120 solvent oil and 5 g of ethylene glycol monobutyl ether, put them in a 250 mL beaker, stir at 250 rpm for 20 min, then put the beaker in a 60°C water bath, add 5 g of cocamidopropyl betaine to the beaker, and stir at 250 rpm for 200 min to prepare an anti-coagulation tube inhibitor.

[0065] Example 4

[0066] Weigh 90 g of heavy aromatic hydrocarbon No. 150 and 5 g of ethylene glycol monobutyl ether, put them in a 250 mL beaker, stir at 250 rpm for 20 min, then put the beaker in a 60 ° C water bath, add 5 g of cocamidopropyl betaine to the beaker, and stir at 250 rpm for 200 min to prepare an anti-coagulation tube inhibitor.

[0067] When the drilling operation found that the heavy oil had invaded the drilling fluid, the inhibitor formulation of Example 4 was immediately added to the mud pool at a concentration of 5% to prepare a drilling fluid system containing a coagulation tube inhibitor for 200 m 3 The drilling fluid is pumped along with the drilling fluid to the drilling depth to contact with the heavy oil invading the reservoir, and then discharged out of the wellhead along with the annulus ( Figure 4 ), during this process, the drilling fluid containing anti-condensation pipe inhibitor can disperse the heavy oil blocks in the drilling fluid, and no condensation pipe problem occurs, ensuring the smooth progress of drilling work.

[0068] The present invention has been disclosed above with preferred embodiments, but those skilled in the art should understand that these embodiments are only used to describe the present invention and should not be understood as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to these embodiments should be deemed to be included in the scope of the claims of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined in the claims.

Claims

1. An anticoagulation tube inhibitor, characterized in that: Calculated by weight percentage, it comprises: 80% to 100% of penetrant and 0% to 20% of solubilizer.

2. The anticoagulation tube inhibitor according to claim 1, characterized in that: Calculated by weight percentage, it comprises: 85% to 95% of penetrant and 5% to 15% of solubilizer.

3. The anticoagulation tube inhibitor according to claim 1 or 2, characterized in that: The penetrant includes one or more of diesel, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, ethylene glycol ether, methyl oleate, xylene, solvent oil No. 21, solvent oil No. 120, solvent oil No. 61, solvent oil D80, solvent oil D100, solvent oil No. 120, solvent oil No. 150, solvent oil No. 200, and white oil.

4. The anticoagulation tube inhibitor according to claim 3, characterized in that: The penetrant is one or a mixture of diesel, ethylene glycol monobutyl ether, methyl oleate, xylene, solvent oil No. 120, solvent oil No. 150, solvent oil No. 200, and white oil.

5. The anticoagulation tube inhibitor according to claim 1 or 2, characterized in that: The solubilizer includes one or more of sodium fatty alcohol polyoxyethylene ether carboxylate, lauryl amide propyl hydroxysulfobetaine, cocamidopropyl betaine, sodium alkylphenol polyoxyethylene ether carboxylate, and coconut oil fatty acid diethanolamide.

6. The anticoagulation tube inhibitor according to claim 5, characterized in that: The solubilizer is one or a mixture of fatty alcohol polyoxyethylene ether sodium carboxylate, lauramide propyl hydroxysulfobetaine, and alkylphenol polyoxyethylene ether sodium carboxylate.

7. The method for preparing the anticoagulation tube inhibitor according to any one of claims 1 to 6, characterized in that: include: The anticoagulation tube inhibitor can be obtained by uniformly mixing the penetrant and the solubilizer according to the ratio.

8. Use of the anti-condensation pipe inhibitor according to any one of claims 1 to 6 in inhibiting heavy oil from invading the condensation pipe of drilling fluid.

9. The method for using the anticoagulation tube inhibitor according to any one of claims 1 to 6, characterized in that: include: When drilling fluid heavy oil invasion occurs or before drilling into a reservoir where heavy oil invasion may occur, the anti-condensation tube inhibitor is directly added into the mud pool and mixed with the drilling fluid. After reaching the drilling layer, it contacts and mixes with the heavy oil invading the drilling fluid and then returns to the surface from the annulus.

10. The method of use according to claim 9, characterized in that: The concentration of the anti-coagulation tube inhibitor in the drilling fluid is 0.5% to 15%.

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